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Imported from libpng-1.0.5q.tar

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This commit is contained in:
Glenn Randers-Pehrson 2000-02-04 23:40:16 -06:00
parent 166c5a397e
commit 61c32d9e66
49 changed files with 7587 additions and 1120 deletions
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65
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.0.5h - December 10, 1999
Libpng 1.0.5q - February 5, 2000
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -73,13 +73,72 @@ version libpng-1.0.5g December 7, 1999
Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
Added "translated_key" to png_text structure and png_write_iTXt().
Added code in pngwrite.c to work around a newly discovered zlib bug.
version 1.0.5h [December 10, 1999]
NOTE: regarding the not for version 1.0.5e, the following must also
version libpng-1.0.5h December 10, 1999
NOTE: regarding the note for version 1.0.5e, the following must also
be included in your code:
png_text[i].translated_key = NULL;
Unknown chunk handling is now supported.
Option to eliminate all floating point support was added. Some new
fixed-point functions such as png_set_gAMA_fixed() were added.
version libpng-1.0.5i December 13, 1999
Added some type casts to silence compiler warnings.
Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
Removed leading blanks from a #define in pngvcrd.c
Added some parameters to the new png_set_keep_unknown_chunks() function,
and relocated it in pngset.c
Added a test for up->location != 0 in the first instance of writing
unknown chunks in pngwrite.c
Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
prevent recursion.
Added png_free_hIST() function.
Various patches to fix bugs in the sCAL and integer cHRM processing,
and to add some convenience macros for use with sCAL.
version libpng-1.0.5j December 21, 1999
Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
around buggy compilers.
Added new type "png_fixed_point" for integers that hold float*100000 values
Restored backward compatibility of tEXt/zTXt chunk processing:
Added members "lang_key" and "itxt_length" to png_text struct. Set
text_length=0 when "text" contains iTXt data. Use the "compression"
member to distinguish among tEXt/zTXt/iTXt types. Restored the first
four members of png_text to the same order as v.1.0.5d. The "Note" above,
about backward incompatibility of libpng-1.0.5e, no longer applies.
Added PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
Fixed png_read|write_iTXt() to read|write parameters in the right order.
and to write the iTXt chunk after IDAT if it appears in the end_ptr.
Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
Reversed the order of trying to write floating-point and fixed-point gAMA.
version libpng-1.0.5k December 27, 1999
Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
Added png_handle_as_unknown()
Added png_free_chunk_list() function and chunk_list and num_chunk_list members
of png_ptr.
Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
version libpng-1.0.5l January 1, 2000
Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
for setting a callback function to handle unknown chunks and for
retrieving the associated user pointer (Glenn).
version 1.0.5m [January 7, 2000]
Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
version 1.0.5n [January 9, 2000]
Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
own memory for info_ptr->palette. This makes it safe for the calling
application to free its copy of the palette any time after it calls
png_set_PLTE().
version 1.0.5o [January 20, 2000]
Cosmetic changes only (removed some trailing blanks and TABs)
version 1.0.5p [January 31, 2000]
Renamed pngdll.mak to makefile.bd32
Cosmetic changes in pngtest.c
version 1.0.5q [February 5, 2000]
Relocated the makefile.solaris warning about PATH problems.
Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
Revised makefile.gcmmx
Send comments/corrections/commendations to
png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

65
CHANGES
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@ -517,7 +517,7 @@ version 1.0.5e [November 30, 1999]
with trailing compressed parts easier in the future, and added new functions
png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
NOTE: Applications that write text chunks MUST define png_text->lang and
NOTE: Applications that write text chunks MUST define png_text->lang
before calling png_set_text(). It must be set to NULL if you want to
write tEXt or zTXt chunks. If you want your application to be able to
run with older versions of libpng, use
@ -544,9 +544,70 @@ version 1.0.5g [December 7, 1999]
Added "translated_key" to png_text structure and png_write_iTXt().
Added code in pngwrite.c to work around a newly discovered zlib bug.
version 1.0.5h [December 10, 1999]
NOTE: regarding the not for version 1.0.5e, the following must also
NOTE: regarding the note for version 1.0.5e, the following must also
be included in your code:
png_text[i].translated_key = NULL;
Unknown chunk handling is now supported.
Option to eliminate all floating point support was added. Some new
fixed-point functions such as png_set_gAMA_fixed() were added.
Expanded tabs and removed trailing blanks in source files.
version 1.0.5i [December 13, 1999]
Added some type casts to silence compiler warnings.
Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
Removed leading blanks from a #define in pngvcrd.c
Added some parameters to the new png_set_keep_unknown_chunks() function.
Added a test for up->location != 0 in the first instance of writing
unknown chunks in pngwrite.c
Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
prevent recursion.
Added png_free_hIST() function.
Various patches to fix bugs in the sCAL and integer cHRM processing,
and to add some convenience macros for use with sCAL.
version 1.0.5j [December 21, 1999]
Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
around buggy compilers.
Added new type "png_fixed_point" for integers that hold float*100000 values
Restored backward compatibility of tEXt/zTXt chunk processing:
Restored the first four members of png_text to the same order as v.1.0.5d.
Added members "lang_key" and "itxt_length" to png_text struct. Set
text_length=0 when "text" contains iTXt data. Use the "compression"
member to distinguish among tEXt/zTXt/iTXt types. Added
PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
The "Note" above, about backward incompatibility of libpng-1.0.5e, no
longer applies.
Fixed png_read|write_iTXt() to read|write parameters in the right order,
and to write the iTXt chunk after IDAT if it appears in the end_ptr.
Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
Reversed the order of trying to write floating-point and fixed-point gAMA.
version 1.0.5k [December 27, 1999]
Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
Added png_handle_as_unknown() function (Glenn)
Added png_free_chunk_list() function and chunk_list and num_chunk_list members
of png_ptr.
Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
version 1.0.5l [January 1, 2000]
Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
for setting a callback function to handle unknown chunks and for
retrieving the associated user pointer (Glenn).
version 1.0.5m [January 7, 2000]
Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
version 1.0.5n [January 9, 2000]
Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
own memory for info_ptr->palette. This makes it safe for the calling
application to free its copy of the palette any time after it calls
png_set_PLTE().
version 1.0.5o [January 20, 2000]
Cosmetic changes only (removed some trailing blanks and TABs)
version 1.0.5p [January 31, 2000]
Renamed pngdll.mak to makefile.bd32
Cosmetic changes in pngtest.c
version 1.0.5q [February 5, 2000]
Relocated the makefile.solaris warning about PATH problems.
Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
Revised makefile.gcmmx
Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros

22
INSTALL
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@ -1,5 +1,5 @@
Installing libpng version 1.0.5h - December 10, 1999
Installing libpng version 1.0.5q - February 5, 2000
Before installing libpng, you must first install zlib. zlib
can usually be found wherever you got libpng. zlib can be
@ -10,7 +10,7 @@ zlib.h and zconf.h include files that correspond to the
version of zlib that's installed.
You can rename the directories that you downloaded (they
might be called "libpng-1.0.5h" or "lpng103" and "zlib-1.1.3"
might be called "libpng-1.0.5q" or "lpng103" and "zlib-1.1.3"
or "zlib113") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this:
@ -36,6 +36,10 @@ Your directory structure should look like this:
contrib
etc.
If the line endings in the files look funny, you may wish to get the other
distribution of libpng. It is available in both tar.gz (UNIX style line
endings) and zip (DOS style line endings) formats.
First enter the zlib directory and follow the instructions
in zlib/README. Then come back here and choose the
appropriate makefile.sys in the scripts directory.
@ -51,8 +55,10 @@ include
makefile.hpux => HPUX (10.20 and 11.00) makefile
makefile.sgi => Silicon Graphics IRIX makefile
makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.5h)
makefile.linux => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5h)
makefile.solaris => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.5q)
makefile.linux => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5q)
makefile.gcmmx => Linux/ELF makefile (gcc, creates libpng.so.2.1.0.5q,
uses assembler code tuned for Intel MMX platform)
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
makefile.mips => MIPS makefile
makefile.acorn => Acorn makefile
@ -61,20 +67,20 @@ include
(Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
makefile.atari => Atari makefile
makefile.beos => BEOS makefile for X86
makefile.borland => Borland makefile
makefile.borland => Borland makefile (uses bcc)
makefile.bd32 => To make a png32bd.dll with Borland C++ 4.5
makefile.turboc3 => Turbo C 3.0 makefile
build.bat => MS-DOS batch file for Borland compiler
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and later (uses
assembler code)
assembler code tuned for Intel MMX platform)
makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and later (does
not use assembler code)
makefile.turboc3 => Turbo C 3.0 makefile
makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
pngos2.def => OS/2 module definition file used by makefile.os2
makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model
makevms.com => VMS build script
pngdll.mak => To make a png32bd.dll with Borland C++ 4.5
pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
SCOPTIONS.ppc => Used with smakefile.ppc

11
KNOWNBUG
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@ -38,6 +38,9 @@ Known bugs and suggested enhancements in libpng-1.0.5
for the png_set_gAMA(), png_set_cHRM(), and corresponding png_get_()
functions will be needed.
Much of this was completed in libpng-1.0.5h, but gamma compensation
is not yet done in fixed-point arithmetic.
4. October 1999 -- BUG
pngvcrd.c is failing for interlaced PNGs that have empty passes.
@ -64,4 +67,10 @@ Known bugs and suggested enhancements in libpng-1.0.5
is not backward compatible (the lang member was added, and the
translated_key member was added to libpng-1.0.5g)
STATUS: Will be fixed before the next public release.
STATUS: Fixed in libpng-1.0.5j/1.1.0
7. December 1999 -- BUG
The new pnggccrd.c has syntax errors when compiled with gcc.
STATUS: Under investigation.

8
LICENSE
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@ -4,8 +4,8 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
(libpng versions 0.5, May 1995, through 0.89c, May 1996)
Copyright (c) 1996, 1997 Andreas Dilger
(libpng versions 0.90, December 1996, through 0.96, May 1997)
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.5h, December 10, 1999)
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.5q, February 5, 2000)
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
@ -63,9 +63,9 @@ boxes and the like:
Also, the PNG logo (in PNG format, of course) is supplied in the
file "pngnow.png".
Libpng is OSI Certified Open Source Software. OSI Certified is a
Libpng is OSI Certified Open Source Software. OSI Certified Open Source is a
certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
randeg@alum.rpi.edu
December 10, 1999
February 5, 2000

22
README
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@ -1,8 +1,12 @@
README for libpng 1.0.5h - December 10, 1999 (shared library 2.1)
README for libpng 1.0.5q - February 5, 2000 (shared library 2.1)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
Libpng comes in two distribution formats. Get libpng-*.tar.gz if you
want UNIX-style line endings in the text files, or lpng*.zip if you want
DOS-style line endings.
Version 0.89 was the first official release of libpng. Don't let the
fact that it's the first release fool you. The libpng library has been in
extensive use and testing since mid-1995. By late 1997 it had
@ -171,9 +175,12 @@ Files in this distribution:
makefile.sgi => Silicon Graphics IRIX makefile
makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile
(gcc, creates libpng.so.2.1.0.5h)
(gcc, creates libpng.so.2.1.0.5q)
makefile.linux => Linux/ELF makefile
(gcc, creates libpng.so.2.1.0.5h)
(gcc, creates libpng.so.2.1.0.5q)
makefile.gcmmx => Linux/ELF makefile (gcc, creates
libpng.so.2.1.0.5q, uses assembler code
tuned for Intel MMX platform)
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
makefile.mips => MIPS makefile
makefile.acorn => Acorn makefile
@ -183,20 +190,21 @@ Files in this distribution:
scripts/SCOPTIONS.ppc)
makefile.atari => Atari makefile
makefile.beos => BEOS makefile for X86
makefile.borland => Borland makefile
makefile.borland => Borland makefile (uses bcc)
makefile.bd32 => To make a png32bd.dll with Borland C++ 4.5
makefile.turboc3 => Turbo C 3.0 makefile
build.bat => MS-DOS batch file for Borland compiler
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
later (uses assembler code)
later (uses assembler code tuned for Intel MMX
platform)
makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and
later (does not use assembler code)
makefile.turboc3 => Turbo C 3.0 makefile
makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
pngos2.def => OS/2 module definition file used by makefile.os2
makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model
makevms.com => VMS build script
pngdll.mak => To make a png32bd.dll with Borland C++ 4.5
pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
SCOPTIONS.ppc => Used with smakefile.ppc

7
TODO
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@ -1,13 +1,11 @@
TODO - list of things to do for libpng:
Final bug fixes.
Fix problem with C++ and EXTERN "C".
Finish work on the no-floating-point version (including gamma compensation)
Better C++ wrapper/full C++ implementation?
Keep up with public chunks.
Fix problem with C++ and EXTERN "C".
cHRM transformation.
Support for application-defined chunk handlers.
Improve setjmp/longjmp usage or remove it in favor of returning error codes.
High-level API for reading images.
Add "grayscale->palette" transformation and "palette->grayscale" detection.
Improved dithering.
Multi-lingual error and warning message support.
@ -19,4 +17,3 @@ Better filter selection
Histogram creation.
Text conversion between different code pages (Latin-1 -> Mac and DOS).
Improve API by hiding the info_ptr.
Make a no-floating-point version.

4
Y2KINFO
View File

@ -1,13 +1,13 @@
Y2K compliance in libpng:
=========================
December 10, 1999
February 5, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.5h are Y2K compliant. It is my belief that earlier
upward through 1.0.5q are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer

52
contrib/pngminus/makefile Normal file
View File

@ -0,0 +1,52 @@
# Makefile for PngMinus (png2pnm and pnm2png)
# Linux / Unix
CC=cc -O -n32
LD=cc -O -n32
#CC=gcc -O
#LD=gcc -O
LB=ar
RM=rm
CP=cp
PNGPATH = /usr/local
PNGINC = $(PNGPATH)/include
PNGLIB = $(PNGPATH)/lib -lpng
# PNGLIB = $(PNGPATH)/libpng.a
ZPATH = /usr/local
ZINC = $(ZPATH)/include
ZLIB = $(ZPATH)/lib -lz
# ZLIB = $(ZPATH)/libz.a
CCFLAGS=-I$(PNGINC) -I$(ZINC)
LDFLAGS=-L$(PNGLIB) -L$(ZLIB) -lm
C=.c
O=.o
L=.a
E=
# dependencies
all: png2pnm$(E) pnm2png$(E)
png2pnm$(O): png2pnm$(C)
$(CC) -c $(CCFLAGS) png2pnm$(C)
png2pnm$(E): png2pnm$(O)
$(LD) -o png2pnm$(E) png2pnm$(O) $(LDFLAGS)
pnm2png$(O): pnm2png$(C)
$(CC) -c $(CCFLAGS) pnm2png$(C)
pnm2png$(E): pnm2png$(O)
$(LD) -o pnm2png$(E) pnm2png$(O) $(LDFLAGS)
clean:
$(RM) png2pnm$(O)
$(RM) pnm2png$(O)
$(RM) png2pnm$(E)
$(RM) pnm2png$(E)
# End of makefile for png2pnm / pnm2png

7
contrib/pngminus/pnm2png.c
View File

@ -77,7 +77,8 @@ int main(int argc, char *argv[])
if ((fp_al = fopen (argv[argi], "rb")) == NULL)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: alpha-channel file %s does not exist\n", argv[argi]);
fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
argv[argi]);
exit (1);
}
break;
@ -511,8 +512,8 @@ png_uint_32 get_value (FILE *pnm_file, int depth)
for (i = 0; i < depth; i++)
mask = (mask << 1) | 0x01;
get_token (pnm_file, token);
sscanf (token, "%lu", &ret_value);
get_token (pnm_file, (char *) token);
sscanf ((const char *) token, "%lu", &ret_value);
ret_value &= mask;

49
example.c
View File

@ -136,6 +136,19 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
/* If we have already read some of the signature */
png_set_sig_bytes(png_ptr, sig_read);
#ifdef hilevel
/*
* If you have enough memory to read in the entire image at once,
* and you need to specify only transforms that can be controlled
* with one of the PNG_TRANSFORM_* bits (this presently excludes
* dithering, filling, setting background, and doing gamma
* adjustment), then you can read the entire image (including
* pixels) into the info structure with this call:
*/
png_read_png(png_ptr, info_ptr, png_transforms, NULL);
#else
/* OK, you're doing it the hard way, with the lower-level functions */
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). REQUIRED
*/
@ -275,7 +288,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
*/
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
{
png_color8p sig_bit;
png_color_8p sig_bit;
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, sig_bit);
@ -350,6 +363,9 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
#endif hilevel
/* At this point you have read the entire image */
/* clean up after the read, and free any memory allocated - REQUIRED */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
@ -530,7 +546,7 @@ void write_png(char *file_name /* , ... other image information ... */)
}
/* Set error handling. REQUIRED if you aren't supplying your own
* error hadnling functions in the png_create_write_struct() call.
* error handling functions in the png_create_write_struct() call.
*/
if (setjmp(png_ptr->jmpbuf))
{
@ -552,6 +568,15 @@ void write_png(char *file_name /* , ... other image information ... */)
/* where user_io_ptr is a structure you want available to the callbacks */
#endif no_streams /* only use one initialization method */
#ifdef hilevel
/* This is the easy way. Use it if you already have all the
* image info living info in the structure. You could "|" many
* PNG_TRANSFORM flags into the png_transforms integer here.
*/
png_write_png(png_ptr, info_ptr, png_transforms, NULL);
#else
/* This is the hard way */
/* Set the image information here. Width and height are up to 2^31,
* bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
* the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
@ -567,6 +592,11 @@ void write_png(char *file_name /* , ... other image information ... */)
palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
/* ... set palette colors ... */
png_set_PLTE(png_ptr, info_ptr, palette, 256);
/* You can free the palette here if you like, since libpng has made its
own copy. In versions of libpng earlier than version 1.0.5n, it was
necessary to keep the palette until after png_write_end(), because
libpng was using the caller's copy. */
free(palette);
/* optional significant bit chunk */
/* if we are dealing with a grayscale image then */
@ -615,6 +645,9 @@ void write_png(char *file_name /* , ... other image information ... */)
* png_write_info_before_PLTE(write_ptr, write_info_ptr);
* write_my_chunk();
* png_write_info(png_ptr, info_ptr);
*
* However, given the level of known- and unknown-chunk support in 1.1.0
* and up, this should no longer be necessary.
*/
/* Once we write out the header, the compression type on the text
@ -695,14 +728,20 @@ void write_png(char *file_name /* , ... other image information ... */)
#endif no_entire /* use only one output method */
/* You can write optional chunks like tEXt, zTXt, and tIME at the end
* as well.
* as well. Shouldn't be necessary in 1.1.0 and up as all the public
* chunks are supported and you can use png_set_unknown_chunks() to
* register unknown chunks into the info structure to be written out.
*/
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end(png_ptr, info_ptr);
#endif hilevel
/* if you malloced the palette, free it here */
free(info_ptr->palette);
/* if you malloced a palette and have not already freed it, free it
here (do *not* free libpng's copy of the palette in info_ptr->palette,
as recommended in versions 1.0.5m and earlier of this example; libpng
now takes care of that automatically). */
free(palette);
/* clean up after the write, and free any memory allocated */
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);

472
libpng.3
View File

@ -1,6 +1,6 @@
.TH LIBPNG 3 "December 10, 1999"
.TH LIBPNG 3 "February 5, 2000"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5q
.SH SYNOPSIS
\fI\fB
@ -84,10 +84,18 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_free_chunk_list (png_structp \fIpng_ptr\fP\fB);\fP
\fI\fB
\fBvoid png_free_default(png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fIptr\fP\fB);\fP
\fI\fB
\fBvoid png_free_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fI\fP\fB);\fP
\fI\fB
\fBvoid png_free_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fI\fP\fB);\fP
\fI\fB
@ -96,11 +104,19 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_free_pixels (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
\fI\fB
\fBvoid png_free_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
\fI\fB
\fBvoid png_free_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
\fI\fB
\fBvoid png_free_spalette (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fInum_text\fP\fB);\fP
\fBvoid png_free_spalettes (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fInum_text\fP\fB);\fP
\fI\fB
@ -112,6 +128,14 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_free_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
\fI\fB
\fBvoid png_free_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fInum_unknowns\fP\fB);\fP
\fI\fB
\fBpng_byte png_get_bit_depth (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
\fI\fB
@ -172,7 +196,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBpng_uint_32 png_get_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charpp \fP\fIname\fP\fB, int \fP\fI*compression_type\fP\fB, png_charpp \fP\fIprofile\fP\fB, int \fI*proflen\fP\fB);\fP
\fBpng_uint_32 png_get_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charpp \fP\fIname\fP\fB, int \fP\fI*compression_type\fP\fB, png_charpp \fP\fIprofile\fP\fB, png_uint_32 \fI*proflen\fP\fB);\fP
\fI\fB
@ -270,6 +294,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBpng_voidp png_get_user_chunk_ptr (png_structp \fIpng_ptr\fP\fB);\fP
\fI\fB
\fBpng_voidp png_get_user_transform_ptr (png_structp \fIpng_ptr\fP\fB);\fP
\fI\fB
@ -362,6 +390,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_read_png (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fItransforms\fP\fB, voidp \fIparams\fP\fB);\fP
\fI\fB
\fBvoid png_read_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fIdisplay_row\fP\fB);\fP
\fI\fB
@ -470,7 +502,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_set_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, int \fIproflen\fP\fB);\fP
\fBvoid png_set_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, png_uint_32 \fIproflen\fP\fB);\fP
\fI\fB
@ -490,7 +522,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_set_keep_unknown_chunks (png_structp \fIpng_ptr\fP\fB);\fP
\fBvoid png_set_keep_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIkeep\fP\fB, png_bytep \fP\fIchunk_list\fP\fB, int \fInum_chunks\fP\fB);\fP
\fI\fB
@ -606,7 +638,11 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBpng_uint_32 png_set_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_unknown_chunkp \fP\fIunknowns\fP\fB, int \fInum\fP\fB);\fP
\fBpng_uint_32 png_set_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_unknown_chunkp \fP\fIunknowns\fP\fB, int \fP\fInum\fP\fB, int \fIlocation\fP\fB);\fP
\fI\fB
\fBvoid png_set_read_user_chunk_fn (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIuser_chunk_ptr\fP\fB, png_user_chunk_ptr \fIread_user_chunk_fn\fP\fB);\fP
\fI\fB
@ -682,6 +718,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_write_png (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fItransforms\fP\fB, voidp \fIparams\fP\fB);\fP
\fI\fB
\fBvoid png_write_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
\fI\fB
@ -701,10 +741,10 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.5h - December 10, 1999
libpng version 1.0.5q - February 5, 2000
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
For conditions of distribution and use, see copyright
notice in png.h.
@ -720,10 +760,9 @@ libpng.txt - A description on how to use and modify libpng
Schalnat, Group 42, Inc.
Updated/rewritten per request in the libpng FAQ
Copyright (c) 1995 Frank J. T. Wojcik
December 18, 1995 && January 20, 1996
Copyright (c) 1995, 1996 Frank J. T. Wojcik
December 18, 1995 & January 20, 1996
*
.SH I. Introduction
This file describes how to use and modify the PNG reference library
@ -803,13 +842,14 @@ And while I'm on the topic, make sure you include the libpng header file:
.SH III. Reading
Reading PNG files:
We'll now walk you through the possible functions to call when reading
in a PNG file, briefly explaining the syntax and purpose of each one.
See example.c and png.h for more detail. While Progressive reading
is covered in the next section, you will still need some of the
functions discussed in this section to read a PNG file.
in a PNG file sequentially, briefly explaining the syntax and purpose
of each one. See example.c and png.h for more detail. While
progressive reading is covered in the next section, you will still
need some of the functions discussed in this section to read a PNG
file.
.SS Setup
You will want to do the I/O initialization(*) before you get into libpng,
so if it doesn't work, you don't have much to undo. Of course, you
@ -909,6 +949,10 @@ free any memory.
return;
}
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
Now you need to set up the input code. The default for libpng is to
use the C function fread(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -925,6 +969,42 @@ libpng know that there are some bytes missing from the start of the file.
png_set_sig_bytes(png_ptr, number);
.SS Setting up callback code
You can set up a callback function to handle any unknown chunks in the
input stream. You must supply the function
read_chunk_callback(png_ptr ptr,
png_unknown_chunkp chunk);
{
/* The unknown chunk structure contains your
chunk data: */
png_byte name[5];
png_byte *data;
png_size_t size;
/* Note that libpng has already taken care of the
CRC handling */
/* put your code here. Return one of the following: */
return (-n); /* chunk had an error */
return (0); /* did not recognize */
return (n); /* success */
}
(You can give your function another name that you like instead of
"read_chunk_callback")
To inform libpng about your function, use
png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr,
read_chunk_callback);
This names not only the callback function, but also a user pointer that
you can retrieve with
png_get_user_chunk_ptr(png_ptr);
At this point, you can set up a callback function that will be
called after each row has been read, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
@ -941,19 +1021,6 @@ To inform libpng about your function, use
png_set_read_status_fn(png_ptr, read_row_callback);
In PNG files, the alpha channel in an image is the level of opacity.
If you need the alpha channel in an image to be the level of transparency
instead of opacity, you can invert the alpha channel (or the tRNS chunk
data) after it's read, so that 0 is fully opaque and 255 (in 8-bit or
paletted images) or 65535 (in 16-bit images) is fully transparent, with
png_set_invert_alpha(png_ptr);
This has to appear here rather than later with the other transformations
because the tRNS chunk data must be modified in the case of paletted images.
If your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't be changed.
Finally, you can write your own transformation function if none of
the existing ones meets your needs. This is done by setting a callback
with
@ -977,6 +1044,8 @@ function
png_set_user_transform_info(png_ptr, user_ptr,
user_depth, user_channels);
The user's application, not libpng, is responsible for allocating and
freeing any memory required for the user structure.
You can retrieve the pointer via the function
png_get_user_transform_ptr(). For example:
@ -984,23 +1053,100 @@ png_get_user_transform_ptr(). For example:
voidp read_user_transform_ptr =
png_get_user_transform_ptr(png_ptr);
You are now ready to read all the file information up to the actual
image data. You do this with a call to png_read_info().
.SS Unknown-chunk handling
Now you get to set the way the library processes unknown chunks in the
input PNG stream. Both known and unknown chunks will be read. Normal
behavior is that known chunks will be parsed into information in
various info_ptr members; unknown chunks will be discarded. To change
this, you can call:
png_set_keep_unknown_chunks(png_ptr, info_ptr, keep,
chunk_list, num_chunks);
keep - 0: do not keep
1: keep only if safe-to-copy
2: keep even if unsafe-to-copy
chunk_list - list of chunks affected (a byte string,
five bytes per chunk, NULL or '\0' if
num_chunks is 0)
num_chunks - number of chunks affected; if 0, all
unknown chunks are affected
Unknown chunks declared in this way will be saved as raw data onto a
list of png_unknown_chunk structures. If a chunk that is normally
known to libpng is named in the list, it will be handled as unknown,
according to the "keep" directive. If a chunk is named in successive
instances of png_set_keep_unknown_chunks(), the final instance will
take precedence.
.SS The high-level read interface
At this point there are two ways to proceed; through the high-level
read interface, or through a sequence of low-level read operations.
You can use the high-level interface if (a) you are willing to read
the entire image into memory, and (b) the input transformations
you want to do are limited to the following set:
PNG_TRANSFORM_IDENTITY No transformation
PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to 8 bits
PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel
PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit samples to bytes
PNG_TRANSFORM_PACKSWAP Change order of packed pixels to LSB first
PNG_TRANSFORM_EXPAND Perform set_expand()
PNG_TRANSFORM_INVERT_MONO Invert monochrome images
PNG_TRANSFORM_SHIFT Normalize pixels to the sBIT depth
PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA to BGRA
PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA to AG
PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity to transparency
PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
(This excludes setting a background color, doing gamma transformation,
dithering, and setting filler.) If this is the case, simply do this:
png_read_png(png_ptr, info_ptr, png_transforms, NULL)
where png_transforms is an integer containing the logical-or of some set of
transformation flags. This call is equivalent to png_read_info(),
followed the set of transformations indicated by the transform mask,
followed by png_update_info(), followed by a read of the image bytes
to the info member `rowpointers', followed by png_read_end().
(The final parameter of this call is not yet used. Someday it
will point to transformation parameters.)
.SS The low-level read interface
If you are going the low-level route, you are now ready to read all
the file information up to the actual image data. You do this with a
call to png_read_info().
png_read_info(png_ptr, info_ptr);
This will read all chunks up to but not including the image data.
Both known and unknown chunks will be read. Known chunks will be
parsed into information in various info_ptr members; unknown chunks
will be discarded, unless you previously called
This will process all chunks up to but not including the image data.
png_set_keep_unknown_chunks();
There is one transformation you may need to set up before doing
png_read_info(), however. In PNG files, the alpha channel in an image
is the level of opacity. If you need the alpha channel in an image to
be the level of transparency instead of opacity, you can invert the
alpha channel (or the tRNS chunk data) after it's read, so that 0 is
fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
images) is fully transparent, with
in which case they will be saved as raw data onto a list of
png_unknown_chunk structures (and written out if you subsequently
call png_write_info and friends).
png_set_invert_alpha(png_ptr);
Functions are used to get the information from the info_ptr:
This must appear before png_write_info() instead of later with the
other transformations because in the case of paletted images the tRNS
chunk data has to be inverted before the tRNS chunk is written.
If your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't need to
be changed, and you can safely do this transformation after your
png_read_info() call.
.SS Querying the info structure
Functions are used to get the information from the info_ptr once it
has been read. Note that these fields may not be completely filled
in until png_read_end() has read the chunk data following the image.
png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type, &interlace_type,
@ -1140,20 +1286,28 @@ into the info_ptr is returned for any complex types.
png_get_bKGD(png_ptr, info_ptr, &background);
background - background color (PNG_VALID_bKGD)
valid 16-bit red, green and blue
values, regardless of color_type
num_text = png_get_text(png_ptr, info_ptr, &text_ptr);
text_ptr - array of png_text holding image
comments
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->key - keyword for comment.
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL for unknown).
text_ptr[i]->text - text comments for current
keyword.
text_ptr[i]->compression - type of compression used
on "text" PNG_TEXT_COMPRESSION_NONE
or PNG_TEXT_COMPRESSION_zTXt
PNG_TEXT_COMPRESSION_zTXt
PNG_ITXT_COMPRESSION_NONE
PNG_ITXT_COMPRESSION_zTXt
text_ptr[i]->key - keyword for comment.
text_ptr[i]->text - text comments for current
keyword.
text_ptr[i]->text_length - length of text string,
after decompression, 0 for iTXt
text_ptr[i]->itxt_length - length of itxt string,
after decompression, 0 for tEXt/zTXt
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL
for unknown).
num_text - number of comments
num_spalettes = png_get_spalettes(png_ptr, info_ptr, &palette_ptr);
palette_ptr - array of png_spalette structures holding contents
of one or more sPLT chunks read.
@ -1188,6 +1342,7 @@ into the info_ptr is returned for any complex types.
unknowns[i].name - name of unknown chunk
unknowns[i].data - data of unknown chunk
unknowns[i].size - size of unknown chunk
unknowns[i].location - position of chunk in file
The data from the pHYs chunk can be retrieved in several convenient
forms:
@ -1232,6 +1387,8 @@ make sure you have read all the text chunks, don't mess with these
until after you read the stuff after the image. This will be
mentioned again below in the discussion that goes with png_read_end().
.SS Input transformations
After you've read the header information, you can set up the library
to handle any special transformations of the image data. The various
ways to transform the data will be described in the order that they
@ -1566,6 +1723,8 @@ are allocating one large chunk, you will need to build an
array of pointers to each row, as it will be needed for some
of the functions below.
.SS Reading image data
After you've allocated memory, you can read the image data.
The simplest way to do this is in one function call. If you are
allocating enough memory to hold the whole image, you can just
@ -1674,12 +1833,14 @@ the second parameter NULL.
png_read_rows(png_ptr, NULL, row_pointers,
number_of_rows);
After you are finished reading the image, you can finish reading
the file. If you are interested in comments or time, which may be
stored either before or after the image data, you should pass the
separate png_info struct if you want to keep the comments from
before and after the image separate. If you are not interested, you
can pass NULL.
.SS Finishing a sequential read
After you are finished reading the image through either the high- or
low-level interfaces, you can finish reading the file. If you are
interested in comments or time, which may be stored either before or
after the image data, you should pass the separate png_info struct if
you want to keep the comments from before and after the image
separate. If you are not interested, you can pass NULL.
png_read_end(png_ptr, end_info);
@ -1694,16 +1855,20 @@ point to allocated storage with the following functions:
png_free_text(png_ptr, info_ptr, num)
num - number of text item to be freed (-1 for all items)
png_free_hIST(png_ptr, info_ptr)
png_free_iCCP(png_ptr, info_ptr)
png_free_pCAL(png_ptr, info_ptr)
png_free_sCAL(png_ptr, info_ptr)
png_free_spalette(png_ptr, info_ptr, num)
png_free_spalettes(png_ptr, info_ptr, num)
num - number of suggested-paletted entry to be freed
(-1 for all suggested palettes)
png_free_pixels(png_ptr, info_ptr)
png_free_unknown_chunk(png_ptr, info_ptr, num)
num - number of unknown chunk to be freed
(-1 for all suggested palettes)
@ -1714,8 +1879,7 @@ case do nothing.
For a more compact example of reading a PNG image, see the file example.c.
Reading PNG files progressively:
.SS Reading PNG files progressively
The progressive reader is slightly different then the non-progressive
reader. Instead of calling png_read_info(), png_read_rows(), and
@ -1892,6 +2056,8 @@ Much of this is very similar to reading. However, everything of
importance is repeated here, so you won't have to constantly look
back up in the reading section to understand writing.
.SS Setup
You will want to do the I/O initialization before you get into libpng,
so if it doesn't work, you don't have anything to undo. If you are not
using the standard I/O functions, you will need to replace them with
@ -1954,6 +2120,10 @@ section below for more information on the libpng error handling.
...
return;
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -1963,6 +2133,8 @@ Libpng section below.
png_init_io(png_ptr, fp);
.SS Write callbacks
At this point, you can set up a callback function that will be
called after each row has been written, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
@ -2017,6 +2189,8 @@ data. See the Compression Library for details on the compression levels.
png_set_compression_window_bits(png_ptr, 15);
png_set_compression_method(png_ptr, 8);
.SS Setting the contents of info for output
You now need to fill in the png_info structure with all the data you
wish to write before the actual image. Note that the only thing you
are allowed to write after the image is the text chunks and the time
@ -2146,15 +2320,22 @@ Some of the more important parts of the png_info are:
png_set_text(png_ptr, info_ptr, text_ptr, num_text);
text_ptr - array of png_text holding image
comments
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->compression - type of compression used
on "text" PNG_TEXT_COMPRESSION_NONE
PNG_TEXT_COMPRESSION_zTXt
PNG_ITXT_COMPRESSION_NONE
PNG_ITXT_COMPRESSION_zTXt
text_ptr[i]->key - keyword for comment.
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL for unknown).
text_ptr[i]->text - text comments for current
keyword.
text_ptr[i]->compression - type of compression used
on "text" PNG_TEXT_COMPRESSION_NONE or
PNG_TEXT_COMPRESSION_zTXt
num_text - number of comments in text_ptr
text_ptr[i]->text_length - length of text string,
after decompression, 0 for iTXt
text_ptr[i]->itxt_length - length of itxt string,
after decompression, 0 for tEXt/zTXt
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL
for unknown).
num_text - number of comments
png_set_spalettes(png_ptr, info_ptr, &palette_ptr, num_spalettes);
palette_ptr - array of png_spalette structures to be added to
@ -2189,20 +2370,15 @@ Some of the more important parts of the png_info are:
unknowns[i].name - name of unknown chunk
unknowns[i].data - data of unknown chunk
unknowns[i].size - size of unknown chunk
In PNG files, the alpha channel in an image is the level of opacity.
If your data is supplied as a level of transparency, you can invert the
alpha channel before you write it, so that 0 is fully transparent and 255
(in 8-bit or paletted images) or 65535 (in 16-bit images) is fully opaque,
with
png_set_invert_alpha(png_ptr);
This must appear here instead of later with the other transformations
because in the case of paletted images the tRNS chunk data has to
be inverted before the tRNS chunk is written. If your image is not a
paletted image, the tRNS data (which in such cases represents a single
color to be rendered as transparent) won't be changed.
unknowns[i].location - position to write chunk in file
0: do not write chunk
PNG_HAVE_IHDR: before PLTE
PNG_HAVE_PLTE: before IDAT
PNG_AFTER_IDAT: after IDAT
The "location" member is set automatically according to
what part of the output file has already been written.
You can change its value after calling png_set_unknown_chunks()
as demonstrated in pngtest.c.
A quick word about text and num_text. text is an array of png_text
structures. num_text is the number of valid structures in the array.
@ -2284,6 +2460,8 @@ by the software. To facilitate the use of RFC 1123 dates, a function
png_convert_to_rfc1123(png_timep) is provided to convert from PNG
time to an RFC 1123 format string.
.SS Writing unknown chunks
You can use the png_set_unknown_chunks function to queue up chunks
for writing. You give it a chunk name, raw data, and a size; that's
all there is to it. The chunks will be written by the next following
@ -2292,11 +2470,63 @@ Any chunks previously read into the info structure's unknown-chunk
list will also be written out in a sequence that satisfies the PNG
specification's ordering rules.
You are now ready to write all the file information up to the actual
image data. You do this with a call to png_write_info().
.SS The high-level write interface
At this point there are two ways to proceed; through the high-level
write interface, or through a sequence of low-level write operations.
You can use the high-level interface if your image data is present
on the rowpointers member of the info structure. All defined output
transformations are pernmitted, enabled by the following masks.
PNG_TRANSFORM_IDENTITY No transformation
PNG_TRANSFORM_PACKING Pack 1, 2 and 4-bit samples
PNG_TRANSFORM_PACKSWAP Change order of packed pixels to LSB first
PNG_TRANSFORM_INVERT_MONO Invert monochrome images
PNG_TRANSFORM_SHIFT Normalize pixels to the sBIT depth
PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA to BGRA
PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA to AG
PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity to transparency
PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
PNG_TRANSFORM_STRIP_FILLER Strip out filler bytes.
If you have valid image data on the rowpointers member, simply do this:
png_write_png(png_ptr, info_ptr, png_transforms, NULL)
where png_transforms is an integer containing the logical-or of some set of
transformation flags. This call is equivalent to png_write_info(),
followed by the set of transformations indicated by the transform
mask, followed by followed by a write of the image bytes to the info
member `rowpointers', followed by png_write_end().
(The final parameter of this call is not yet used. Someday it
may point to output transformation parameters.)
.SS The low-level write interface
If you are going the low-level route instead, you are now ready to
write all the file information up to the actual image data. You do
this with a call to png_write_info().
png_write_info(png_ptr, info_ptr);
Note that there is one transformation you may need to do before
png_write_info(). In PNG files, the alpha channel in an image is the
level of opacity. If your data is supplied as a level of
transparency, you can invert the alpha channel before you write it, so
that 0 is fully transparent and 255 (in 8-bit or paletted images) or
65535 (in 16-bit images) is fully opaque, with
png_set_invert_alpha(png_ptr);
This must appear before png_write_info() instead of later with the
other transformations because in the case of paletted images the tRNS
chunk data has to be inverted before the tRNS chunk is written. If
your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't need to
be changed, and you can safely do this transformation after your
png_write_info() call.
If you need to write a private chunk that you want to appear before
the PLTE chunk when PLTE is present, you can write the PNG info in
two steps, and insert code to write your own chunk between them:
@ -2437,6 +2667,8 @@ may be acceptable for real-time applications). Infrequent flushing will
only degrade the compression performance by a few percent over images
that do not use flushing.
.SS Writing the image data
That's it for the transformations. Now you can write the image data.
The simplest way to do this is in one function call. If have the
whole image in memory, you can just call png_write_image() and libpng
@ -2470,7 +2702,7 @@ row_pointers:
png_write_row(png_ptr, &row_pointer);
When the file is interlaced, things can get a good deal more
complicated. The only currently (as of August 1999 -- PNG Specification
complicated. The only currently (as of January 2000 -- PNG Specification
version 1.2, dated July 1999) defined interlacing scheme for PNG files
is the "Adam7" interlace scheme, that breaks down an
image into seven smaller images of varying size. libpng will build
@ -2500,6 +2732,8 @@ As some of these rows are not used, and thus return immediately,
you may want to read about interlacing in the PNG specification,
and only update the rows that are actually used.
.SS Finishing a sequential write
After you are finished writing the image, you should finish writing
the file. If you are interested in writing comments or time, you should
pass an appropriately filled png_info pointer. If you are not interested,
@ -2517,16 +2751,20 @@ point to allocated storage with the following functions:
png_free_text(png_ptr, info_ptr, num)
num - number of text item to be freed (-1 for all items)
png_free_hIST(png_ptr, info_ptr)
png_free_iCCP(png_ptr, info_ptr)
png_free_pCAL(png_ptr, info_ptr)
png_free_sCAL(png_ptr, info_ptr)
png_free_spalette(png_ptr, info_ptr, num)
png_free_spalettes(png_ptr, info_ptr, num)
num - number of suggested-paletted entry to be freed
(-1 for all suggested palettes)
png_free_pixels(png_ptr, info_ptr)
png_free_unknown_chunk(png_ptr, info_ptr, num)
num - number of unknown chunk entry to be freed
(-1 for all suggested palettes)
@ -2535,8 +2773,7 @@ These functions may be safely called when the relevant storage has
already been freed, or has not yet been allocated, and will in that
case do nothing.
You must free any data you allocated for info_ptr, such as comments,
palette, or histogram, before the call to png_destroy_write_struct();
If you allocated palette data, you must free it before the call to png_destroy_write_struct();
For a more compact example of writing a PNG image, see the file example.c.
@ -2596,8 +2833,11 @@ a write stream, and vice versa.
Error handling in libpng is done through png_error() and png_warning().
Errors handled through png_error() are fatal, meaning that png_error()
should never return to its caller. Currently, this is handled via
setjmp() and longjmp(), but you could change this to do things like
exit() if you should wish. On non-fatal errors, png_warning() is called
setjmp() and longjmp() (unless you have compiled libpng with
PNG_SETJMP_NOT_SUPPORTED, in which case it is handled via PNG_ABORT()),
but you could change this to do things like exit() if you should wish.
On non-fatal errors, png_warning() is called
to print a warning message, and then control returns to the calling code.
By default png_error() and png_warning() print a message on stderr via
fprintf() unless the library is compiled with PNG_NO_STDIO defined. If
@ -2630,16 +2870,25 @@ after a longjmp, so the user may want to be careful about doing anything after
setjmp returns non-zero besides returning itself. Consult your compiler
documentation for more details.
If you need to read or write custom chunks, you will need to get deeper
into the libpng code, as a mechanism has not yet been supplied for user
callbacks with custom chunks. First, read the PNG specification, and have
a first level of understanding of how it works. Pay particular attention
to the sections that describe chunk names, and look at how other chunks
were designed, so you can do things similarly. Second, check out the
sections of libpng that read and write chunks. Try to find a chunk that
is similar to yours and use it as a template. More details can be found in the
comments inside the code. A way of handling unknown chunks in a generic
method, potentially via callback functions, would be best.
.SS Custom chunks
If you need to read or write custom chunks, you may need to get deeper
into the libpng code. The library now has mechanisms for storing
and writing chunks of unknown type; you can even declare callbacks
for custom chunks. Hoewver, this may not be good enough if the
library code itself needs to know about interactions between your
chunk and existing `intrinsic' chunks.
If you need to write a new intrinsic chunk, first read the PNG
specification. Acquire a first level of
understanding of how it works. Pay particular attention to the
sections that describe chunk names, and look at how other chunks were
designed, so you can do things similarly. Second, check out the
sections of libpng that read and write chunks. Try to find a chunk
that is similar to yours and use it as a template. More details can
be found in the comments inside the code. It is best to handle unknown
chunks in a generic method, via callback functions, instead of by
modifying libpng functions.
If you wish to write your own transformation for the data, look through
the part of the code that does the transformations, and check out some of
@ -2647,7 +2896,7 @@ the simpler ones to get an idea of how they work. Try to find a similar
transformation to the one you want to add and copy off of it. More details
can be found in the comments inside the code itself.
Configuring for 16 bit platforms:
.SS Configuring for 16 bit platforms
You may need to change the png_large_malloc() and png_large_free()
routines in pngmem.c, as these are required to allocate 64K, although
@ -2656,13 +2905,13 @@ you will want to look into zconf.h to tell zlib (and thus libpng) that
it cannot allocate more then 64K at a time. Even if you can, the memory
won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
Configuring for DOS:
.SS Configuring for DOS
For DOS users who only have access to the lower 640K, you will
have to limit zlib's memory usage via a png_set_compression_mem_level()
call. See zlib.h or zconf.h in the zlib library for more information.
Configuring for Medium Model:
.SS Configuring for Medium Model
Libpng's support for medium model has been tested on most of the popular
compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
@ -2670,10 +2919,10 @@ defined, and FAR gets defined to far in pngconf.h, and you should be
all set. Everything in the library (except for zlib's structure) is
expecting far data. You must use the typedefs with the p or pp on
the end for pointers (or at least look at them and be careful). Make
note that the row's of data are defined as png_bytepp, which is an
note that the rows of data are defined as png_bytepp, which is an
unsigned char far * far *.
Configuring for gui/windowing platforms:
.SS Configuring for gui/windowing platforms:
You will need to write new error and warning functions that use the GUI
interface, as described previously, and set them to be the error and
@ -2682,7 +2931,7 @@ in order to have them available during the structure initialization.
They can be changed later via png_set_error_fn(). On some compilers,
you may also have to change the memory allocators (png_malloc, etc.).
Configuring for compiler xxx:
.SS Configuring for compiler xxx:
All includes for libpng are in pngconf.h. If you need to add/change/delete
an include, this is the place to do it. The includes that are not
@ -2690,7 +2939,7 @@ needed outside libpng are protected by the PNG_INTERNAL definition,
which is only defined for those routines inside libpng itself. The
files in libpng proper only include png.h, which includes pngconf.h.
Configuring zlib:
.SS Configuring zlib:
There are special functions to configure the compression. Perhaps the
most useful one changes the compression level, which currently uses
@ -2722,7 +2971,7 @@ zlib.h for more information on what these mean.
window_bits);
png_set_compression_method(png_ptr, method);
Controlling row filtering:
.SS Controlling row filtering
If you want to control whether libpng uses filtering or not, which
filters are used, and how it goes about picking row filters, you
@ -2788,7 +3037,7 @@ Note that the numbers above were invented purely for this example and
are given only to help explain the function usage. Little testing has
been done to find optimum values for either the costs or the weights.
Removing unwanted object code:
.SS Removing unwanted object code
There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are
@ -2826,7 +3075,7 @@ library to fail if they call functions not available in your library.
The size of the library itself should not be an issue, because only
those sections that are actually used will be loaded into memory.
Requesting debug printout:
.SS Requesting debug printout
The macro definition PNG_DEBUG can be used to request debugging
printout. Set it to an integer value in the range 0 to 3. Higher
@ -2898,13 +3147,13 @@ the old method.
.SH VII. Y2K Compliance in libpng
December 10, 1999
February 5, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.5h are Y2K compliant. It is my belief that earlier
upward through 1.0.5q are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
@ -3030,7 +3279,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.0.5h - December 10, 1999:
Libpng version 1.0.5q - February 5, 2000:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).
@ -3044,8 +3293,8 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
(libpng versions 0.5, May 1995, through 0.89c, May 1996)
Copyright (c) 1996, 1997 Andreas Dilger
(libpng versions 0.90, December 1996, through 0.96, May 1997)
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.5h, December 10, 1999)
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
(libpng versions 0.97, January 1998, through 1.0.5q, February 5, 2000)
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
@ -3058,6 +3307,7 @@ is defined as the following set of individuals:
Tom Lane
Dave Martindale
Glenn Randers-Pehrson
Eric S. Raymond
Greg Roelofs
Guy Eric Schalnat
Paul Schmidt

405
libpng.txt
View File

@ -1,9 +1,9 @@
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.5h - December 10, 1999
libpng version 1.0.5q - February 5, 2000
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
For conditions of distribution and use, see copyright
notice in png.h.
@ -19,10 +19,9 @@ libpng.txt - A description on how to use and modify libpng
Schalnat, Group 42, Inc.
Updated/rewritten per request in the libpng FAQ
Copyright (c) 1995 Frank J. T. Wojcik
December 18, 1995 && January 20, 1996
Copyright (c) 1995, 1996 Frank J. T. Wojcik
December 18, 1995 & January 20, 1996
*
I. Introduction
This file describes how to use and modify the PNG reference library
@ -102,13 +101,14 @@ And while I'm on the topic, make sure you include the libpng header file:
III. Reading
Reading PNG files:
We'll now walk you through the possible functions to call when reading
in a PNG file, briefly explaining the syntax and purpose of each one.
See example.c and png.h for more detail. While Progressive reading
is covered in the next section, you will still need some of the
functions discussed in this section to read a PNG file.
in a PNG file sequentially, briefly explaining the syntax and purpose
of each one. See example.c and png.h for more detail. While
progressive reading is covered in the next section, you will still
need some of the functions discussed in this section to read a PNG
file.
Setup
You will want to do the I/O initialization(*) before you get into libpng,
so if it doesn't work, you don't have much to undo. Of course, you
@ -208,6 +208,10 @@ free any memory.
return;
}
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
Now you need to set up the input code. The default for libpng is to
use the C function fread(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -224,6 +228,42 @@ libpng know that there are some bytes missing from the start of the file.
png_set_sig_bytes(png_ptr, number);
Setting up callback code
You can set up a callback function to handle any unknown chunks in the
input stream. You must supply the function
read_chunk_callback(png_ptr ptr,
png_unknown_chunkp chunk);
{
/* The unknown chunk structure contains your
chunk data: */
png_byte name[5];
png_byte *data;
png_size_t size;
/* Note that libpng has already taken care of the
CRC handling */
/* put your code here. Return one of the following: */
return (-n); /* chunk had an error */
return (0); /* did not recognize */
return (n); /* success */
}
(You can give your function another name that you like instead of
"read_chunk_callback")
To inform libpng about your function, use
png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr,
read_chunk_callback);
This names not only the callback function, but also a user pointer that
you can retrieve with
png_get_user_chunk_ptr(png_ptr);
At this point, you can set up a callback function that will be
called after each row has been read, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
@ -240,19 +280,6 @@ To inform libpng about your function, use
png_set_read_status_fn(png_ptr, read_row_callback);
In PNG files, the alpha channel in an image is the level of opacity.
If you need the alpha channel in an image to be the level of transparency
instead of opacity, you can invert the alpha channel (or the tRNS chunk
data) after it's read, so that 0 is fully opaque and 255 (in 8-bit or
paletted images) or 65535 (in 16-bit images) is fully transparent, with
png_set_invert_alpha(png_ptr);
This has to appear here rather than later with the other transformations
because the tRNS chunk data must be modified in the case of paletted images.
If your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't be changed.
Finally, you can write your own transformation function if none of
the existing ones meets your needs. This is done by setting a callback
with
@ -276,6 +303,8 @@ function
png_set_user_transform_info(png_ptr, user_ptr,
user_depth, user_channels);
The user's application, not libpng, is responsible for allocating and
freeing any memory required for the user structure.
You can retrieve the pointer via the function
png_get_user_transform_ptr(). For example:
@ -283,23 +312,100 @@ png_get_user_transform_ptr(). For example:
voidp read_user_transform_ptr =
png_get_user_transform_ptr(png_ptr);
You are now ready to read all the file information up to the actual
image data. You do this with a call to png_read_info().
Unknown-chunk handling
Now you get to set the way the library processes unknown chunks in the
input PNG stream. Both known and unknown chunks will be read. Normal
behavior is that known chunks will be parsed into information in
various info_ptr members; unknown chunks will be discarded. To change
this, you can call:
png_set_keep_unknown_chunks(png_ptr, info_ptr, keep,
chunk_list, num_chunks);
keep - 0: do not keep
1: keep only if safe-to-copy
2: keep even if unsafe-to-copy
chunk_list - list of chunks affected (a byte string,
five bytes per chunk, NULL or '\0' if
num_chunks is 0)
num_chunks - number of chunks affected; if 0, all
unknown chunks are affected
Unknown chunks declared in this way will be saved as raw data onto a
list of png_unknown_chunk structures. If a chunk that is normally
known to libpng is named in the list, it will be handled as unknown,
according to the "keep" directive. If a chunk is named in successive
instances of png_set_keep_unknown_chunks(), the final instance will
take precedence.
The high-level read interface
At this point there are two ways to proceed; through the high-level
read interface, or through a sequence of low-level read operations.
You can use the high-level interface if (a) you are willing to read
the entire image into memory, and (b) the input transformations
you want to do are limited to the following set:
PNG_TRANSFORM_IDENTITY No transformation
PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to 8 bits
PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel
PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit samples to bytes
PNG_TRANSFORM_PACKSWAP Change order of packed pixels to LSB first
PNG_TRANSFORM_EXPAND Perform set_expand()
PNG_TRANSFORM_INVERT_MONO Invert monochrome images
PNG_TRANSFORM_SHIFT Normalize pixels to the sBIT depth
PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA to BGRA
PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA to AG
PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity to transparency
PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
(This excludes setting a background color, doing gamma transformation,
dithering, and setting filler.) If this is the case, simply do this:
png_read_png(png_ptr, info_ptr, png_transforms, NULL)
where png_transforms is an integer containing the logical-or of some set of
transformation flags. This call is equivalent to png_read_info(),
followed the set of transformations indicated by the transform mask,
followed by png_update_info(), followed by a read of the image bytes
to the info member `rowpointers', followed by png_read_end().
(The final parameter of this call is not yet used. Someday it
will point to transformation parameters.)
The low-level read interface
If you are going the low-level route, you are now ready to read all
the file information up to the actual image data. You do this with a
call to png_read_info().
png_read_info(png_ptr, info_ptr);
This will read all chunks up to but not including the image data.
Both known and unknown chunks will be read. Known chunks will be
parsed into information in various info_ptr members; unknown chunks
will be discarded, unless you previously called
This will process all chunks up to but not including the image data.
png_set_keep_unknown_chunks();
There is one transformation you may need to set up before doing
png_read_info(), however. In PNG files, the alpha channel in an image
is the level of opacity. If you need the alpha channel in an image to
be the level of transparency instead of opacity, you can invert the
alpha channel (or the tRNS chunk data) after it's read, so that 0 is
fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
images) is fully transparent, with
in which case they will be saved as raw data onto a list of
png_unknown_chunk structures (and written out if you subsequently
call png_write_info and friends).
png_set_invert_alpha(png_ptr);
Functions are used to get the information from the info_ptr:
This must appear before png_write_info() instead of later with the
other transformations because in the case of paletted images the tRNS
chunk data has to be inverted before the tRNS chunk is written.
If your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't need to
be changed, and you can safely do this transformation after your
png_read_info() call.
Querying the info structure
Functions are used to get the information from the info_ptr once it
has been read. Note that these fields may not be completely filled
in until png_read_end() has read the chunk data following the image.
png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type, &interlace_type,
@ -439,20 +545,28 @@ into the info_ptr is returned for any complex types.
png_get_bKGD(png_ptr, info_ptr, &background);
background - background color (PNG_VALID_bKGD)
valid 16-bit red, green and blue
values, regardless of color_type
num_text = png_get_text(png_ptr, info_ptr, &text_ptr);
text_ptr - array of png_text holding image
comments
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->key - keyword for comment.
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL for unknown).
text_ptr[i]->text - text comments for current
keyword.
text_ptr[i]->compression - type of compression used
on "text" PNG_TEXT_COMPRESSION_NONE
or PNG_TEXT_COMPRESSION_zTXt
PNG_TEXT_COMPRESSION_zTXt
PNG_ITXT_COMPRESSION_NONE
PNG_ITXT_COMPRESSION_zTXt
text_ptr[i]->key - keyword for comment.
text_ptr[i]->text - text comments for current
keyword.
text_ptr[i]->text_length - length of text string,
after decompression, 0 for iTXt
text_ptr[i]->itxt_length - length of itxt string,
after decompression, 0 for tEXt/zTXt
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL
for unknown).
num_text - number of comments
num_spalettes = png_get_spalettes(png_ptr, info_ptr, &palette_ptr);
palette_ptr - array of png_spalette structures holding contents
of one or more sPLT chunks read.
@ -487,6 +601,7 @@ into the info_ptr is returned for any complex types.
unknowns[i].name - name of unknown chunk
unknowns[i].data - data of unknown chunk
unknowns[i].size - size of unknown chunk
unknowns[i].location - position of chunk in file
The data from the pHYs chunk can be retrieved in several convenient
forms:
@ -531,6 +646,8 @@ make sure you have read all the text chunks, don't mess with these
until after you read the stuff after the image. This will be
mentioned again below in the discussion that goes with png_read_end().
Input transformations
After you've read the header information, you can set up the library
to handle any special transformations of the image data. The various
ways to transform the data will be described in the order that they
@ -865,6 +982,8 @@ are allocating one large chunk, you will need to build an
array of pointers to each row, as it will be needed for some
of the functions below.
Reading image data
After you've allocated memory, you can read the image data.
The simplest way to do this is in one function call. If you are
allocating enough memory to hold the whole image, you can just
@ -973,12 +1092,14 @@ the second parameter NULL.
png_read_rows(png_ptr, NULL, row_pointers,
number_of_rows);
After you are finished reading the image, you can finish reading
the file. If you are interested in comments or time, which may be
stored either before or after the image data, you should pass the
separate png_info struct if you want to keep the comments from
before and after the image separate. If you are not interested, you
can pass NULL.
Finishing a sequential read
After you are finished reading the image through either the high- or
low-level interfaces, you can finish reading the file. If you are
interested in comments or time, which may be stored either before or
after the image data, you should pass the separate png_info struct if
you want to keep the comments from before and after the image
separate. If you are not interested, you can pass NULL.
png_read_end(png_ptr, end_info);
@ -993,16 +1114,20 @@ point to allocated storage with the following functions:
png_free_text(png_ptr, info_ptr, num)
num - number of text item to be freed (-1 for all items)
png_free_hIST(png_ptr, info_ptr)
png_free_iCCP(png_ptr, info_ptr)
png_free_pCAL(png_ptr, info_ptr)
png_free_sCAL(png_ptr, info_ptr)
png_free_spalette(png_ptr, info_ptr, num)
png_free_spalettes(png_ptr, info_ptr, num)
num - number of suggested-paletted entry to be freed
(-1 for all suggested palettes)
png_free_pixels(png_ptr, info_ptr)
png_free_unknown_chunk(png_ptr, info_ptr, num)
num - number of unknown chunk to be freed
(-1 for all suggested palettes)
@ -1013,8 +1138,7 @@ case do nothing.
For a more compact example of reading a PNG image, see the file example.c.
Reading PNG files progressively:
Reading PNG files progressively
The progressive reader is slightly different then the non-progressive
reader. Instead of calling png_read_info(), png_read_rows(), and
@ -1191,6 +1315,8 @@ Much of this is very similar to reading. However, everything of
importance is repeated here, so you won't have to constantly look
back up in the reading section to understand writing.
Setup
You will want to do the I/O initialization before you get into libpng,
so if it doesn't work, you don't have anything to undo. If you are not
using the standard I/O functions, you will need to replace them with
@ -1253,6 +1379,10 @@ section below for more information on the libpng error handling.
...
return;
If you would rather avoid the complexity of setjmp/longjmp issues,
you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
errors will result in a call to PNG_ABORT() which defaults to abort().
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
@ -1262,6 +1392,8 @@ Libpng section below.
png_init_io(png_ptr, fp);
Write callbacks
At this point, you can set up a callback function that will be
called after each row has been written, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
@ -1316,6 +1448,8 @@ data. See the Compression Library for details on the compression levels.
png_set_compression_window_bits(png_ptr, 15);
png_set_compression_method(png_ptr, 8);
Setting the contents of info for output
You now need to fill in the png_info structure with all the data you
wish to write before the actual image. Note that the only thing you
are allowed to write after the image is the text chunks and the time
@ -1445,15 +1579,22 @@ Some of the more important parts of the png_info are:
png_set_text(png_ptr, info_ptr, text_ptr, num_text);
text_ptr - array of png_text holding image
comments
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->compression - type of compression used
on "text" PNG_TEXT_COMPRESSION_NONE
PNG_TEXT_COMPRESSION_zTXt
PNG_ITXT_COMPRESSION_NONE
PNG_ITXT_COMPRESSION_zTXt
text_ptr[i]->key - keyword for comment.
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL for unknown).
text_ptr[i]->text - text comments for current
keyword.
text_ptr[i]->compression - type of compression used
on "text" PNG_TEXT_COMPRESSION_NONE or
PNG_TEXT_COMPRESSION_zTXt
num_text - number of comments in text_ptr
text_ptr[i]->text_length - length of text string,
after decompression, 0 for iTXt
text_ptr[i]->itxt_length - length of itxt string,
after decompression, 0 for tEXt/zTXt
text_ptr[i]->lang - language of comment (NULL for unknown).
text_ptr[i]->translated_keyword - keyword in UTF-8 (NULL
for unknown).
num_text - number of comments
png_set_spalettes(png_ptr, info_ptr, &palette_ptr, num_spalettes);
palette_ptr - array of png_spalette structures to be added to
@ -1488,20 +1629,15 @@ Some of the more important parts of the png_info are:
unknowns[i].name - name of unknown chunk
unknowns[i].data - data of unknown chunk
unknowns[i].size - size of unknown chunk
In PNG files, the alpha channel in an image is the level of opacity.
If your data is supplied as a level of transparency, you can invert the
alpha channel before you write it, so that 0 is fully transparent and 255
(in 8-bit or paletted images) or 65535 (in 16-bit images) is fully opaque,
with
png_set_invert_alpha(png_ptr);
This must appear here instead of later with the other transformations
because in the case of paletted images the tRNS chunk data has to
be inverted before the tRNS chunk is written. If your image is not a
paletted image, the tRNS data (which in such cases represents a single
color to be rendered as transparent) won't be changed.
unknowns[i].location - position to write chunk in file
0: do not write chunk
PNG_HAVE_IHDR: before PLTE
PNG_HAVE_PLTE: before IDAT
PNG_AFTER_IDAT: after IDAT
The "location" member is set automatically according to
what part of the output file has already been written.
You can change its value after calling png_set_unknown_chunks()
as demonstrated in pngtest.c.
A quick word about text and num_text. text is an array of png_text
structures. num_text is the number of valid structures in the array.
@ -1583,6 +1719,8 @@ by the software. To facilitate the use of RFC 1123 dates, a function
png_convert_to_rfc1123(png_timep) is provided to convert from PNG
time to an RFC 1123 format string.
Writing unknown chunks
You can use the png_set_unknown_chunks function to queue up chunks
for writing. You give it a chunk name, raw data, and a size; that's
all there is to it. The chunks will be written by the next following
@ -1591,11 +1729,63 @@ Any chunks previously read into the info structure's unknown-chunk
list will also be written out in a sequence that satisfies the PNG
specification's ordering rules.
You are now ready to write all the file information up to the actual
image data. You do this with a call to png_write_info().
The high-level write interface
At this point there are two ways to proceed; through the high-level
write interface, or through a sequence of low-level write operations.
You can use the high-level interface if your image data is present
on the rowpointers member of the info structure. All defined output
transformations are pernmitted, enabled by the following masks.
PNG_TRANSFORM_IDENTITY No transformation
PNG_TRANSFORM_PACKING Pack 1, 2 and 4-bit samples
PNG_TRANSFORM_PACKSWAP Change order of packed pixels to LSB first
PNG_TRANSFORM_INVERT_MONO Invert monochrome images
PNG_TRANSFORM_SHIFT Normalize pixels to the sBIT depth
PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA to BGRA
PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA to AG
PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity to transparency
PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
PNG_TRANSFORM_STRIP_FILLER Strip out filler bytes.
If you have valid image data on the rowpointers member, simply do this:
png_write_png(png_ptr, info_ptr, png_transforms, NULL)
where png_transforms is an integer containing the logical-or of some set of
transformation flags. This call is equivalent to png_write_info(),
followed by the set of transformations indicated by the transform
mask, followed by followed by a write of the image bytes to the info
member `rowpointers', followed by png_write_end().
(The final parameter of this call is not yet used. Someday it
may point to output transformation parameters.)
The low-level write interface
If you are going the low-level route instead, you are now ready to
write all the file information up to the actual image data. You do
this with a call to png_write_info().
png_write_info(png_ptr, info_ptr);
Note that there is one transformation you may need to do before
png_write_info(). In PNG files, the alpha channel in an image is the
level of opacity. If your data is supplied as a level of
transparency, you can invert the alpha channel before you write it, so
that 0 is fully transparent and 255 (in 8-bit or paletted images) or
65535 (in 16-bit images) is fully opaque, with
png_set_invert_alpha(png_ptr);
This must appear before png_write_info() instead of later with the
other transformations because in the case of paletted images the tRNS
chunk data has to be inverted before the tRNS chunk is written. If
your image is not a paletted image, the tRNS data (which in such cases
represents a single color to be rendered as transparent) won't need to
be changed, and you can safely do this transformation after your
png_write_info() call.
If you need to write a private chunk that you want to appear before
the PLTE chunk when PLTE is present, you can write the PNG info in
two steps, and insert code to write your own chunk between them:
@ -1736,6 +1926,8 @@ may be acceptable for real-time applications). Infrequent flushing will
only degrade the compression performance by a few percent over images
that do not use flushing.
Writing the image data
That's it for the transformations. Now you can write the image data.
The simplest way to do this is in one function call. If have the
whole image in memory, you can just call png_write_image() and libpng
@ -1769,7 +1961,7 @@ row_pointers:
png_write_row(png_ptr, &row_pointer);
When the file is interlaced, things can get a good deal more
complicated. The only currently (as of August 1999 -- PNG Specification
complicated. The only currently (as of January 2000 -- PNG Specification
version 1.2, dated July 1999) defined interlacing scheme for PNG files
is the "Adam7" interlace scheme, that breaks down an
image into seven smaller images of varying size. libpng will build
@ -1799,6 +1991,8 @@ As some of these rows are not used, and thus return immediately,
you may want to read about interlacing in the PNG specification,
and only update the rows that are actually used.
Finishing a sequential write
After you are finished writing the image, you should finish writing
the file. If you are interested in writing comments or time, you should
pass an appropriately filled png_info pointer. If you are not interested,
@ -1816,16 +2010,20 @@ point to allocated storage with the following functions:
png_free_text(png_ptr, info_ptr, num)
num - number of text item to be freed (-1 for all items)
png_free_hIST(png_ptr, info_ptr)
png_free_iCCP(png_ptr, info_ptr)
png_free_pCAL(png_ptr, info_ptr)
png_free_sCAL(png_ptr, info_ptr)
png_free_spalette(png_ptr, info_ptr, num)
png_free_spalettes(png_ptr, info_ptr, num)
num - number of suggested-paletted entry to be freed
(-1 for all suggested palettes)
png_free_pixels(png_ptr, info_ptr)
png_free_unknown_chunk(png_ptr, info_ptr, num)
num - number of unknown chunk entry to be freed
(-1 for all suggested palettes)
@ -1834,8 +2032,7 @@ These functions may be safely called when the relevant storage has
already been freed, or has not yet been allocated, and will in that
case do nothing.
You must free any data you allocated for info_ptr, such as comments,
palette, or histogram, before the call to png_destroy_write_struct();
If you allocated palette data, you must free it before the call to png_destroy_write_struct();
For a more compact example of writing a PNG image, see the file example.c.
@ -1895,8 +2092,11 @@ a write stream, and vice versa.
Error handling in libpng is done through png_error() and png_warning().
Errors handled through png_error() are fatal, meaning that png_error()
should never return to its caller. Currently, this is handled via
setjmp() and longjmp(), but you could change this to do things like
exit() if you should wish. On non-fatal errors, png_warning() is called
setjmp() and longjmp() (unless you have compiled libpng with
PNG_SETJMP_NOT_SUPPORTED, in which case it is handled via PNG_ABORT()),
but you could change this to do things like exit() if you should wish.
On non-fatal errors, png_warning() is called
to print a warning message, and then control returns to the calling code.
By default png_error() and png_warning() print a message on stderr via
fprintf() unless the library is compiled with PNG_NO_STDIO defined. If
@ -1929,16 +2129,25 @@ after a longjmp, so the user may want to be careful about doing anything after
setjmp returns non-zero besides returning itself. Consult your compiler
documentation for more details.
If you need to read or write custom chunks, you will need to get deeper
into the libpng code, as a mechanism has not yet been supplied for user
callbacks with custom chunks. First, read the PNG specification, and have
a first level of understanding of how it works. Pay particular attention
to the sections that describe chunk names, and look at how other chunks
were designed, so you can do things similarly. Second, check out the
sections of libpng that read and write chunks. Try to find a chunk that
is similar to yours and use it as a template. More details can be found in the
comments inside the code. A way of handling unknown chunks in a generic
method, potentially via callback functions, would be best.
Custom chunks
If you need to read or write custom chunks, you may need to get deeper
into the libpng code. The library now has mechanisms for storing
and writing chunks of unknown type; you can even declare callbacks
for custom chunks. Hoewver, this may not be good enough if the
library code itself needs to know about interactions between your
chunk and existing `intrinsic' chunks.
If you need to write a new intrinsic chunk, first read the PNG
specification. Acquire a first level of
understanding of how it works. Pay particular attention to the
sections that describe chunk names, and look at how other chunks were
designed, so you can do things similarly. Second, check out the
sections of libpng that read and write chunks. Try to find a chunk
that is similar to yours and use it as a template. More details can
be found in the comments inside the code. It is best to handle unknown
chunks in a generic method, via callback functions, instead of by
modifying libpng functions.
If you wish to write your own transformation for the data, look through
the part of the code that does the transformations, and check out some of
@ -1946,7 +2155,7 @@ the simpler ones to get an idea of how they work. Try to find a similar
transformation to the one you want to add and copy off of it. More details
can be found in the comments inside the code itself.
Configuring for 16 bit platforms:
Configuring for 16 bit platforms
You may need to change the png_large_malloc() and png_large_free()
routines in pngmem.c, as these are required to allocate 64K, although
@ -1955,13 +2164,13 @@ you will want to look into zconf.h to tell zlib (and thus libpng) that
it cannot allocate more then 64K at a time. Even if you can, the memory
won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
Configuring for DOS:
Configuring for DOS
For DOS users who only have access to the lower 640K, you will
have to limit zlib's memory usage via a png_set_compression_mem_level()
call. See zlib.h or zconf.h in the zlib library for more information.
Configuring for Medium Model:
Configuring for Medium Model
Libpng's support for medium model has been tested on most of the popular
compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
@ -1969,7 +2178,7 @@ defined, and FAR gets defined to far in pngconf.h, and you should be
all set. Everything in the library (except for zlib's structure) is
expecting far data. You must use the typedefs with the p or pp on
the end for pointers (or at least look at them and be careful). Make
note that the row's of data are defined as png_bytepp, which is an
note that the rows of data are defined as png_bytepp, which is an
unsigned char far * far *.
Configuring for gui/windowing platforms:
@ -2021,7 +2230,7 @@ zlib.h for more information on what these mean.
window_bits);
png_set_compression_method(png_ptr, method);
Controlling row filtering:
Controlling row filtering
If you want to control whether libpng uses filtering or not, which
filters are used, and how it goes about picking row filters, you
@ -2087,7 +2296,7 @@ Note that the numbers above were invented purely for this example and
are given only to help explain the function usage. Little testing has
been done to find optimum values for either the costs or the weights.
Removing unwanted object code:
Removing unwanted object code
There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are
@ -2125,7 +2334,7 @@ library to fail if they call functions not available in your library.
The size of the library itself should not be an issue, because only
those sections that are actually used will be loaded into memory.
Requesting debug printout:
Requesting debug printout
The macro definition PNG_DEBUG can be used to request debugging
printout. Set it to an integer value in the range 0 to 3. Higher
@ -2197,13 +2406,13 @@ the old method.
VII. Y2K Compliance in libpng
December 10, 1999
February 5, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.5h are Y2K compliant. It is my belief that earlier
upward through 1.0.5q are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that

12
libpngpf.3
View File

@ -1,6 +1,6 @@
.TH LIBPNGPF 3 December 10, 1999
.TH LIBPNGPF 3 February 5, 2000
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5q
(private functions)
.SH SYNOPSIS
\fB#include <png.h>\fP
@ -187,6 +187,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBint png_handle_as_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
\fI\fB
\fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
\fI\fB
@ -505,9 +509,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.5h
\fI\fB
\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, \fIpng_spalette_p
\fI\fBpalette\fP\fB);\fP
\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
\fI\fB

4
png.5
View File

@ -1,4 +1,4 @@
.TH PNG 5 "December 10, 1999"
.TH PNG 5 "February 5, 2000"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION
@ -20,7 +20,7 @@ platforms.
.SH "SEE ALSO"
.IR libpng(3), zlib(3), deflate(5), and zlib(5)
.LP
PNG 1.1 specification, January 1999:
PNG 1.2 specification, July 1999:
.IP
.br
http://www.cdrom.com/pub/png

178
png.c
View File

@ -1,15 +1,16 @@
/* png.c - location for general purpose libpng functions
*
* libpng version 1.0.5h - December 10, 1999
* libpng version 1.0.5q - February 5, 2000
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
*/
#define PNG_INTERNAL
#define PNG_NO_EXTERN
#include <assert.h>
#include "png.h"
/* Version information for C files. This had better match the version
@ -18,7 +19,7 @@
#ifdef PNG_USE_GLOBAL_ARRAYS
/* png_libpng_ver was changed to a function in version 1.0.5c */
char png_libpng_ver[12] = "1.0.5h";
char png_libpng_ver[12] = "1.0.5q";
/* png_sig was changed to a function in version 1.0.5c */
/* Place to hold the signature string for a PNG file. */
@ -263,6 +264,8 @@ png_info_init(png_infop info_ptr)
void
png_free_text(png_structp png_ptr, png_infop info_ptr, int num)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (num != -1)
{
if (info_ptr->text[num].key)
@ -270,20 +273,34 @@ png_free_text(png_structp png_ptr, png_infop info_ptr, int num)
png_free(png_ptr, info_ptr->text[num].key);
info_ptr->text[num].key = NULL;
}
if (info_ptr->text[num].lang)
{
png_free(png_ptr, info_ptr->text[num].lang);
info_ptr->text[num].lang = NULL;
}
}
else if (info_ptr->text != NULL)
{
int i;
if(info_ptr->text != NULL)
{
for (i = 0; i < info_ptr->num_text; i++)
png_free_text(png_ptr, info_ptr, i);
png_free(png_ptr, info_ptr->text);
info_ptr->text = NULL;
}
info_ptr->num_text=0;
}
}
#endif
#if defined(PNG_tRNS_SUPPORTED)
/* free any tRNS entry */
void
png_free_tRNS(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_tRNS)
{
png_free(png_ptr, info_ptr->trans);
info_ptr->valid &= ~PNG_INFO_tRNS;
}
}
#endif
@ -292,12 +309,16 @@ png_free_text(png_structp png_ptr, png_infop info_ptr, int num)
void
png_free_sCAL(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_sCAL)
{
png_free(png_ptr, info_ptr->scal_unit);
#ifdef PNG_FIXED_POINT_SUPPORTED
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, info_ptr->scal_s_width);
png_free(png_ptr, info_ptr->scal_s_height);
#else
if(png_ptr != NULL)
/* silence a compiler warning */ ;
#endif
info_ptr->valid &= ~PNG_INFO_sCAL;
}
@ -309,6 +330,8 @@ png_free_sCAL(png_structp png_ptr, png_infop info_ptr)
void
png_free_pCAL(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_pCAL)
{
png_free(png_ptr, info_ptr->pcal_purpose);
@ -328,10 +351,12 @@ png_free_pCAL(png_structp png_ptr, png_infop info_ptr)
#endif
#if defined(PNG_iCCP_SUPPORTED)
/* free any pCAL entry */
/* free any iCCP entry */
void
png_free_iCCP(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_iCCP)
{
png_free(png_ptr, info_ptr->iccp_name);
@ -344,19 +369,25 @@ png_free_iCCP(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_sPLT_SUPPORTED)
/* free a given sPLT entry, or (if num == -1) all sPLT entries */
void
png_free_spalette(png_structp png_ptr, png_infop info_ptr, int num)
png_free_spalettes(png_structp png_ptr, png_infop info_ptr, int num)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (num != -1)
{
png_free(png_ptr, info_ptr->splt_palettes[num].name);
png_free(png_ptr, info_ptr->splt_palettes[num].entries);
info_ptr->valid &= ~PNG_INFO_sPLT;
}
else
{
png_uint_32 i;
int i;
for (i = 0; i < info_ptr->splt_palettes_num; i++)
png_free_spalette(png_ptr, info_ptr, num);
if(info_ptr->splt_palettes_num == 0)
return;
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
png_free_spalettes(png_ptr, info_ptr, i);
png_free(png_ptr, info_ptr->splt_palettes);
info_ptr->splt_palettes_num = 0;
@ -366,8 +397,10 @@ png_free_spalette(png_structp png_ptr, png_infop info_ptr, int num)
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
void
png_free_unknown_chunk(png_structp png_ptr, png_infop info_ptr, int num)
png_free_unknown_chunks(png_structp png_ptr, png_infop info_ptr, int num)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (num != -1)
{
png_free(png_ptr, info_ptr->unknown_chunks[num].data);
@ -375,15 +408,78 @@ png_free_unknown_chunk(png_structp png_ptr, png_infop info_ptr, int num)
}
else
{
png_uint_32 i;
int i;
for (i = 0; i < info_ptr->unknown_chunks_num; i++)
png_free_unknown_chunk(png_ptr, info_ptr, num);
if(info_ptr->unknown_chunks_num == 0)
return;
for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
png_free_unknown_chunks(png_ptr, info_ptr, i);
png_free(png_ptr, info_ptr->unknown_chunks);
info_ptr->unknown_chunks_num = 0;
}
}
void
png_free_chunk_list(png_structp png_ptr)
{
if (png_ptr == NULL)
return;
if (png_ptr->num_chunk_list)
{
png_free(png_ptr, png_ptr->chunk_list);
png_ptr->num_chunk_list=0;
}
}
#endif
#if defined(PNG_hIST_SUPPORTED)
/* free any hIST entry */
void
png_free_hIST(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_hIST)
{
png_free(png_ptr, info_ptr->hist);
info_ptr->valid &= ~PNG_INFO_hIST;
}
}
#endif
/* free any PLTE entry that was internally allocated */
void
png_free_PLTE(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_PLTE)
{
if (info_ptr->valid & PNG_ALLOCATED_INFO_PLTE)
png_zfree(png_ptr, info_ptr->palette);
info_ptr->valid &= ~(PNG_INFO_PLTE|PNG_ALLOCATED_INFO_PLTE);
info_ptr->num_palette = 0;
}
}
#if defined(PNG_INFO_IMAGE_SUPPORTED)
/* free any image bits attached to the info structure */
void
png_free_pixels(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr == NULL || info_ptr == NULL)
return;
if (info_ptr->valid & PNG_INFO_IDAT)
{
int row;
for (row = 0; row < (int)info_ptr->height; row++)
png_free(png_ptr, info_ptr->row_pointers[row]);
png_free(png_ptr, info_ptr->row_pointers);
info_ptr->valid &= ~PNG_INFO_IDAT;
}
}
#endif
/* This is an internal routine to free any memory that the info struct is
@ -397,6 +493,9 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_READ_TEXT_SUPPORTED)
png_free_text(png_ptr, info_ptr, -1);
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
png_free_tRNS(png_ptr, info_ptr);
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
png_free_sCAL(png_ptr, info_ptr);
#endif
@ -407,10 +506,18 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
png_free_iCCP(png_ptr, info_ptr);
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
png_free_spalette(png_ptr, info_ptr, -1);
png_free_spalettes(png_ptr, info_ptr, -1);
#endif
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
png_free_unknown_chunk(png_ptr, info_ptr, -1);
png_free_unknown_chunks(png_ptr, info_ptr, -1);
png_free_chunk_list(png_ptr);
#endif
#if defined(PNG_hIST_SUPPORTED)
png_free_hIST(png_ptr, info_ptr);
#endif
png_free_PLTE(png_ptr, info_ptr);
#if defined(PNG_INFO_IMAGE_SUPPORTED)
png_free_pixels(png_ptr, info_ptr);
#endif
png_info_init(info_ptr);
}
@ -489,10 +596,10 @@ png_charp
png_get_copyright(png_structp png_ptr)
{
if (png_ptr != NULL || png_ptr == NULL) /* silence compiler warning */
return ("\n libpng version 1.0.5h - December 10, 1999\n\
return ("\n libpng version 1.0.5q - February 5, 2000\n\
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
Copyright (c) 1996, 1997 Andreas Dilger\n\
Copyright (c) 1998, 1999 Glenn Randers-Pehrson\n");
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson\n");
return ("");
}
@ -507,8 +614,8 @@ png_get_libpng_ver(png_structp png_ptr)
{
/* Version of *.c files used when building libpng */
if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
return("1.0.5h");
return("1.0.5h");
return("1.0.5q");
return("1.0.5q");
}
png_charp
@ -532,8 +639,25 @@ png_get_header_version(png_structp png_ptr)
/* Generate a compiler error if there is an old png.h in the search path. */
void
png_check_version
(version_1_0_5h png_h_is_not_version_1_0_5h)
(version_1_0_5q png_h_is_not_version_1_0_5q)
{
if(png_h_is_not_version_1_0_5h == NULL)
if(png_h_is_not_version_1_0_5q == NULL)
return;
}
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
int
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
{
/* check chunk_name and return "keep" value if it's on the list, else 0 */
int i;
png_bytep p;
if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
return 0;
p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
for (i = png_ptr->num_chunk_list; i; i--, p-=5)
if (!png_memcmp(chunk_name, p, 4))
return ((int)*(p+4));
return 0;
}
#endif

383
png.h
View File

@ -1,27 +1,27 @@
/* png.h - header file for PNG reference library
*
* libpng version 1.0.5h - December 10, 1999
* libpng version 1.0.5q - February 5, 2000
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* Authors and maintainers:
* libpng versions 0.71, May 1995, through 0.89c, May 1996: Guy Schalnat
* libpng versions 0.90, December 1996, through 0.96, May 1997: Andreas Dilger
* libpng versions 0.97, January 1998, through 1.0.5h - December 10, 1999: Glenn
* libpng versions 0.97, January 1998, through 1.0.5q - February 5, 2000: Glenn
* See also "Contributing Authors", below.
*
* Y2K compliance in libpng:
* =========================
*
* December 10, 1999
* February 5, 2000
*
* Since the PNG Development group is an ad-hoc body, we can't make
* an official declaration.
*
* This is your unofficial assurance that libpng from version 0.71 and
* upward through 1.0.5h are Y2K compliant. It is my belief that earlier
* upward through 1.0.5q are Y2K compliant. It is my belief that earlier
* versions were also Y2K compliant.
*
* Libpng only has three year fields. One is a 2-byte unsigned integer
@ -98,8 +98,8 @@
* 1.0.4a-f 1.0.4a-f 10005 2.1.0.4a-f
* 1.0.5 1.0.5 10005 2.1.0.5
* 1.0.5a-d 1.0.5a-d 10006 2.1.0.5a-d
* 1.0.5e-h 1.0.5e-h 10100 2.1.0.5e-h
* 1.1.0 1.1.0 10100 3.1.0.0
* 1.0.5e-p 1.0.5e-p 10100 2.1.0.5e-p
* 1.1.0 1.1.0 10100 3.1.1.0
*
* Henceforth the source version will match the shared-library minor
* and patch numbers; the shared-library major version number will be
@ -122,8 +122,8 @@
* (libpng versions 0.5, May 1995, through 0.89c, May 1996)
* Copyright (c) 1996, 1997 Andreas Dilger
* (libpng versions 0.90, December 1996, through 0.96, May 1997)
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* (libpng versions 0.97, January 1998, through 1.0.5h, December 10, 1999)
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
* (libpng versions 0.97, January 1998, through 1.0.5q, February 5, 2000)
*
* For the purposes of this copyright and license, "Contributing Authors"
* is defined as the following set of individuals:
@ -224,7 +224,7 @@ extern "C" {
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.0.5h"
#define PNG_LIBPNG_VER_STRING "1.0.5q"
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros.
@ -324,18 +324,23 @@ typedef png_spalette FAR * png_spalette_p;
typedef png_spalette FAR * FAR * png_spalette_pp;
#ifdef PNG_TEXT_SUPPORTED
/* png_text holds the contents of a text chunk in a PNG file, and whether
* that contents is compressed or not. The "keyword" field points to a
* regular C string. */
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
* and whether that contents is compressed or not. The "key" field
* points to a regular C string. */
typedef struct png_text_struct
{
int compression; /* compression value, see PNG_TEXT_COMPRESSION_ */
int compression; /* compression value:
-1: tEXt, none
0: zTXt, deflate
1: iTXt, none
2: iTXt, deflate */
png_charp key; /* keyword, 1-79 character description of "text" */
png_charp lang; /* language code, 1-79 characters */
png_charp translated_key; /* translated keyword, 1-79 characters */
png_charp text; /* comment, may be an empty string (ie "") */
/* text_length is no longer used, and now present for compatibility only */
png_size_t text_length; /* length of "text" field (not used any more) */
png_size_t text_length; /* length of the text string */
png_size_t itxt_length; /* length of the itxt string */
png_charp lang; /* language code, 1-79 characters */
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
chars */
} png_text;
typedef png_text FAR * png_textp;
typedef png_text FAR * FAR * png_textpp;
@ -347,7 +352,9 @@ typedef png_text FAR * FAR * png_textpp;
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
#define PNG_TEXT_COMPRESSION_NONE -1
#define PNG_TEXT_COMPRESSION_zTXt 0
#define PNG_TEXT_COMPRESSION_LAST 1 /* Not a valid value */
#define PNG_ITXT_COMPRESSION_NONE 1
#define PNG_ITXT_COMPRESSION_zTXt 2
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
/* png_time is a way to hold the time in an machine independent way.
* Two conversions are provided, both from time_t and struct tm. There
@ -379,8 +386,7 @@ typedef struct png_unknown_chunk_t
png_byte *data;
png_size_t size;
/* libpng-using applications should NOT modify this byte. Applications
that are inserting a new unknown chunk can set it to 0. */
/* libpng-using applications should NOT directly modify this byte. */
png_byte location; /* mode of operation at read time */
}
png_unknown_chunk;
@ -410,11 +416,10 @@ typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
* that use the old direct-access method with png_info_struct.
*
* The following members may have allocated storage attached that should be
* cleaned up before the structure is discarded: palette, text, pcal_purpose,
* pcal_units, pcal_params, iccp_name, iccp_profile, splt_palettes, and
* scal_unit. Of these, the text, pcal_*, iccp_*, splt_*, and scal_unit
* members are automatically freed when the info structure is deallocated.
* The palette member is not.
* cleaned up before the structure is discarded: palette, trans, text,
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
* splt_palettes, scal_unit, and row_pointers. These are automatically
* freed when the info structure is deallocated.
*
* More allocation details: all the chunk-reading functions that change these
* members go through the corresponding png_set_* functions. Functions to
@ -460,9 +465,7 @@ typedef struct png_info_struct
#ifdef PNG_FLOATING_POINT_SUPPORTED
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32 int_gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
#endif
png_fixed_point int_gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
#endif
#if defined(PNG_sRGB_SUPPORTED)
@ -483,6 +486,9 @@ typedef struct png_info_struct
int num_text; /* number of comments read/to write */
int max_text; /* current size of text array */
png_textp text; /* array of comments read/to write */
int num_text_old; /* number of comments read/to write */
png_textp text_old; /* array of comments read/to write, backward
compatible with libpng-1.0.5 and earlier */
#endif /* PNG_TEXT_SUPPORTED */
#if defined(PNG_tIME_SUPPORTED)
@ -576,14 +582,14 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
float y_blue;
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32 int_x_white;
png_uint_32 int_y_white;
png_uint_32 int_x_red;
png_uint_32 int_y_red;
png_uint_32 int_x_green;
png_uint_32 int_y_green;
png_uint_32 int_x_blue;
png_uint_32 int_y_blue;
png_fixed_point int_x_white;
png_fixed_point int_y_white;
png_fixed_point int_x_red;
png_fixed_point int_y_red;
png_fixed_point int_x_green;
png_fixed_point int_y_green;
png_fixed_point int_x_blue;
png_fixed_point int_y_blue;
#endif
#endif
@ -626,17 +632,20 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
#if defined(PNG_sCAL_SUPPORTED)
/* The sCAL chunk describes the actual physical dimensions of the
* subject matter of the graphic. The chunk contains a unit specification
* (an ASCII string), and two ASCII strings representing floating-point
* a byte value, and two ASCII strings representing floating-point
* values. The values are width and height corresponsing to one pixel
* in the image. This external representation is converted to double
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
*/
png_charp scal_unit; /* unit of physical scale */
png_charp scal_s_width; /* string containing height */
png_charp scal_s_height; /* string containing width */
png_byte scal_unit; /* unit of physical scale */
#ifdef PNG_FLOATING_POINT_SUPPORTED
double scal_pixel_width; /* width of one pixel */
double scal_pixel_height; /* height of one pixel */
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_charp scal_s_width; /* string containing height */
png_charp scal_s_height; /* string containing width */
#endif
#endif
#endif
@ -645,6 +654,11 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
png_unknown_chunkp unknown_chunks;
png_size_t unknown_chunks_num;
#endif
#if defined(PNG_INFO_IMAGE_SUPPORTED)
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
png_bytepp row_pointers; /* the image bits */
#endif
} png_info;
typedef png_info FAR * png_infop;
@ -691,6 +705,12 @@ typedef png_info FAR * FAR * png_infopp;
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
#define PNG_EQUATION_LAST 4 /* Not a valid value */
/* These are for the sCAL chunk. These values should NOT be changed. */
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
#define PNG_SCALE_METER 1 /* meters per pixel */
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
#define PNG_SCALE_LAST 3 /* Not a valid value */
/* These are for the pHYs chunk. These values should NOT be changed. */
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
@ -727,6 +747,8 @@ typedef png_info FAR * FAR * png_infopp;
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
#define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */
#define PNG_ALLOCATED_INFO_PLTE 0x10000L /* GR-P, 1.0.6 */
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
@ -773,6 +795,28 @@ typedef void (*png_user_transform_ptr) PNGARG((png_structp,
png_row_infop, png_bytep));
#endif
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
typedef int (*png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
#endif
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
typedef void (*png_unknown_chunk_ptr) PNGARG((png_structp));
#endif
/* Transform masks for the high-level interface */
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
#define PNG_TRANSFORM_INVERT_ALPHA 0x0200 /* read and write */
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
@ -785,8 +829,9 @@ typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
struct png_struct_def
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf jmpbuf; /* used in png_error */
#endif
png_error_ptr error_fn; /* function for printing errors and aborting */
png_error_ptr warning_fn; /* function for printing warnings */
png_voidp error_ptr; /* user supplied struct for error functions */
@ -809,6 +854,11 @@ struct png_struct_def
png_byte user_transform_channels; /* channels in user transformed pixels */
#endif
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
png_voidp user_chunk_ptr;
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
#endif
png_uint_32 mode; /* tells us where we are in the PNG file */
png_uint_32 flags; /* flags indicating various things to libpng */
png_uint_32 transformations; /* which transformations to perform */
@ -884,9 +934,7 @@ struct png_struct_def
float gamma; /* file gamma value */
float screen_gamma; /* screen gamma value (display_exponent) */
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32 int_gamma;
#endif
png_fixed_point int_gamma;
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
@ -989,19 +1037,24 @@ struct png_struct_def
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
png_byte empty_plte_permitted;
#endif
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
int num_chunk_list;
png_bytep chunk_list;
#endif
};
/* This prevents a compiler error in png_get_copyright() in png.c if png.c
and png.h are both at * version 1.0.5h
and png.h are both at * version 1.0.5q
*/
typedef png_structp version_1_0_5h;
typedef png_structp version_1_0_5q;
typedef png_struct FAR * FAR * png_structpp;
/* Here are the function definitions most commonly used. This is not
* the place to find out how to use libpng. See libpng.txt for the
* full explanation, see example.c for the summary. This just provides
* a simple one line of the use of each function.
* a simple one line description of the use of each function.
*/
/* Tell lib we have already handled the first <num_bytes> magic bytes.
@ -1487,6 +1540,13 @@ extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
PNGARG((png_structp png_ptr));
#endif
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
png_ptr));
#endif
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
/* Sets the function callbacks for the push reader, and a pointer to a
* user-defined structure available to the callback functions.
@ -1653,10 +1713,10 @@ extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 *int_white_x, png_uint_32 *int_white_y,
png_uint_32 *int_red_x, png_uint_32 *int_red_y, png_uint_32 *int_green_x,
png_uint_32 *int_green_y, png_uint_32 *int_blue_x,
png_uint_32 *int_blue_y));
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
*int_blue_x, png_fixed_point *int_blue_y));
#endif
#endif
@ -1668,9 +1728,10 @@ extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 int_white_x, png_uint_32 int_white_y,
png_uint_32 int_red_x, png_uint_32 int_red_y, png_uint_32 int_green_x,
png_uint_32 int_green_y, png_uint_32 int_blue_x, png_uint_32 int_blue_y));
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
png_fixed_point int_blue_y));
#endif
#endif
@ -1679,10 +1740,8 @@ extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
png_infop info_ptr, double *file_gamma));
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 *int_file_gamma));
#endif
png_infop info_ptr, png_fixed_point *int_file_gamma));
#endif
#if defined(PNG_gAMA_SUPPORTED)
@ -1690,10 +1749,8 @@ extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
png_infop info_ptr, double file_gamma));
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 int_file_gamma));
#endif
png_infop info_ptr, png_fixed_point int_file_gamma));
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
@ -1785,13 +1842,13 @@ extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
#if defined(PNG_READ_iCCP_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charpp name, int *compression_type,
png_charpp profile, png_int_32 *proflen));
png_charpp profile, png_uint_32 *proflen));
#endif
#if defined(PNG_iCCP_SUPPORTED)
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charp name, int compression_type,
png_charp profile, int proflen));
png_charp profile, png_uint_32 proflen));
extern PNG_EXPORT(void,png_free_iCCP) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#endif
@ -1804,11 +1861,23 @@ extern PNG_EXPORT(png_uint_32,png_get_spalettes) PNGARG((png_structp png_ptr,
#if defined(PNG_sPLT_SUPPORTED)
extern PNG_EXPORT(void,png_set_spalettes) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_spalette_p entries, int nentries));
extern PNG_EXPORT(void,png_free_spalette) PNGARG((png_structp png_ptr,
extern PNG_EXPORT(void,png_free_spalettes) PNGARG((png_structp png_ptr,
png_infop info_ptr, int num));
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
/* png_get_itxt also returns the number of text chunks in *num_text */
extern PNG_EXPORT(png_uint_32,png_get_itxt) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp *text_ptr, int *num_text));
#endif
#if defined(PNG_TEXT_SUPPORTED)
extern PNG_EXPORT(void,png_set_itxt) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp text_ptr, int num_text));
#endif
#if defined(PNG_READ_TEXT_SUPPORTED)
/* Old interface; apps should use png_get_itxt instead */
/* png_get_text also returns the number of text chunks in *num_text */
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp *text_ptr, int *num_text));
@ -1818,7 +1887,7 @@ extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp text_ptr, int num_text));
extern PNG_EXPORT(void,png_free_text) PNGARG((png_structp png_ptr,
png_infop info_ptr, int num_text));
png_infop info_ptr, int num_text_old));
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
@ -1843,22 +1912,32 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
png_color_16p trans_values));
#endif
#if defined(PNG_tRNS_SUPPORTED)
extern PNG_EXPORT(void,png_free_tRNS) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charpp unit, double *width, double *height));
#endif
png_infop info_ptr, int *unit, double *width, double *height));
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charpp unit, png_charpp swidth, png_charpp sheight));
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
#endif
#endif
#endif /* PNG_READ_sCAL_SUPPORTED */
#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
#if defined(PNG_sCAL_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charp unit, double width, double height));
png_infop info_ptr, int unit, double width, double height));
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charp unit, png_charp swidth, png_charp sheight));
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
#endif
#endif /* PNG_READ_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
@ -1867,13 +1946,37 @@ extern PNG_EXPORT(void,png_free_sCAL) PNGARG((png_structp png_ptr,
#endif /* PNG_READ_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp png_ptr));
/* provide a list of chunks and how they are to be handled, if the built-in
handling or default unknown chunk handling is not desired. Any chunks not
listed will be handled in the default manner. The IHDR and IEND chunks
must not be listed.
keep = 0: follow default behavour
= 1: do not keep
= 2: keep only if safe-to-copy
= 3: keep even if unsafe-to-copy
*/
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_unknown_chunkp unknowns, int nunknowns));
extern PNG_EXPORT(void,png_free_unknown_chunk) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
extern PNG_EXPORT(void,png_free_unknown_chunks) PNGARG((png_structp png_ptr,
png_infop info_ptr, int num));
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_unknown_chunkpp entries));
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
extern PNG_EXPORT(void,png_free_chunk_list) PNGARG((png_structp png_ptr));
#endif
#if defined(PNG_INFO_IMAGE_SUPPORTED)
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
png_infop info_ptr,
int transforms,
voidp params));
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
png_infop info_ptr,
int transforms,
voidp params));
extern PNG_EXPORT(void, png_free_pixels) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#endif
/* Define PNG_DEBUG at compile time for debugging information. Higher
@ -1915,7 +2018,8 @@ extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
#define PNG_HEADER_VERSION_STRING " libpng version 1.0.5h - December 10, 1999 (header)\n"
#define PNG_HEADER_VERSION_STRING \
" libpng version 1.0.5q - February 5, 2000 (header)\n"
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
/* With these routines we avoid an integer divide, which will be slower on
@ -1999,7 +2103,7 @@ extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
#define PNG_EXPAND 0x1000
#define PNG_GAMMA 0x2000
#define PNG_GRAY_TO_RGB 0x4000
#define PNG_FILLER 0x8000
#define PNG_FILLER 0x8000L
#define PNG_PACKSWAP 0x10000L
#define PNG_SWAP_ALPHA 0x20000L
#define PNG_STRIP_ALPHA 0x40000L
@ -2035,8 +2139,14 @@ extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
#define PNG_FLAG_FREE_PALETTE 0x1000
#define PNG_FLAG_FREE_TRANS 0x2000
#define PNG_FLAG_FREE_HIST 0x4000
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
/* For use in png_set_keep_unknown, png_handle_as_unknown */
#define HANDLE_CHUNK_AS_DEFAULT 0
#define HANDLE_CHUNK_NEVER 1
#define HANDLE_CHUNK_IF_SAFE 2
#define HANDLE_CHUNK_ALWAYS 3
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
PNG_FLAG_CRC_ANCILLARY_NOWARN)
@ -2122,18 +2232,18 @@ PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5];
* values, which is almost certainly true.
*/
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
#if defined(PNG_READ_pCAL_SUPPORTED)
# if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED)
# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
#endif /* PNG_READ_pCAL_SUPPORTED */
# endif
# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
#else
#if defined(PNG_READ_pCAL_SUPPORTED)
# if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED)
PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
#endif /* PNG_READ_pCAL_SUPPORTED */
# endif
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
/* Initialize png_ptr struct for reading, and allocate any other memory.
* (old interface - NOT DLL EXPORTED).
@ -2248,7 +2358,7 @@ PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_uint_32
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
file_gamma));
#endif
#endif
@ -2267,9 +2377,10 @@ PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
png_uint_32 int_white_x, png_uint_32 int_white_y,
png_uint_32 int_red_x, png_uint_32 int_red_y, png_uint_32 int_green_x,
png_uint_32 int_green_y, png_uint_32 int_blue_x, png_uint_32 int_blue_y));
png_fixed_point int_white_x, png_fixed_point int_white_y,
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
png_fixed_point int_blue_y));
#endif
#endif
@ -2304,6 +2415,14 @@ PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
int num_hist));
#endif
#if defined(PNG_hIST_SUPPORTED)
extern PNG_EXPORT(void,png_free_hIST) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#endif
extern PNG_EXPORT(void,png_free_PLTE) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
@ -2322,7 +2441,7 @@ PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
#if defined(PNG_WRITE_iTXt_SUPPORTED)
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
int compression, png_charp key, png_charp lang, png_charp translated_key,
int compression, png_charp key, png_charp lang, png_charp lang_key,
png_charp text));
#endif
@ -2351,10 +2470,13 @@ PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
#if defined(PNG_WRITE_sCAL_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
png_charp unit, double width, double height));
#endif
int unit, double width, double height));
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
png_charp unit, png_charp width, png_charp height));
int unit, png_charp width, png_charp height));
#endif
#endif
#endif
/* Called when finished processing a row of data */
@ -2528,13 +2650,8 @@ PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#if defined(PNG_READ_gAMA_SUPPORTED)
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
#if defined(PNG_READ_bKGD_SUPPORTED)
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
@ -2543,8 +2660,13 @@ PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
#if defined(PNG_READ_gAMA_SUPPORTED)
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
@ -2553,23 +2675,8 @@ extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif /* PNG_READ_iCCP_SUPPORTED */
#if defined(PNG_READ_sPLT_SUPPORTED)
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif /* PNG_READ_sPLT_SUPPORTED */
#if defined(PNG_READ_tRNS_SUPPORTED)
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_bKGD_SUPPORTED)
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
#if defined(PNG_READ_iTXt_SUPPORTED)
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
@ -2583,18 +2690,28 @@ PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif /* PNG_READ_sPLT_SUPPORTED */
#if defined(PNG_READ_sRGB_SUPPORTED)
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
@ -2603,14 +2720,24 @@ PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_tIME_SUPPORTED)
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
PNG_EXTERN int png_handle_as_unknown PNGARG((png_structp png_ptr, png_bytep
chunk_name));
#endif
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,

6
pngasmrd.h
View File

@ -1,8 +1,8 @@
/* pngasmrd.h - assembler version of utilities to read a PNG file
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1999 Glenn Randers-Pehrson
* Copyright (c) 1999, 2000 Glenn Randers-Pehrson
*
*/
@ -21,7 +21,7 @@
/* Set this in the makefile for gcc on Pentium, not in pngconf.h */
#ifdef PNG_USE_PNGGCCRD
/* Platform must be Pentium. Makefile must assemble and load pnggccrd.c
* (not available in libpng 1.0.5h).
* (not available in libpng 1.0.5q).
* MMX will be detected at run time and used if present.
*/
#define PNG_HAVE_ASSEMBLER_COMBINE_ROW

65
pngconf.h
View File

@ -1,11 +1,11 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
/* Any machine specific code is near the front of this file, so if you
@ -111,6 +111,11 @@
#include <sys/types.h>
#endif
#ifndef PNG_SETJMP_NOT_SUPPORTED
# define PNG_SETJMP_SUPPORTED
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* This is an attempt to force a single setjmp behaviour on Linux. If
* the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
*/
@ -134,6 +139,7 @@ __dont__ include it again
# undef _PNG_SAVE_BSD_SOURCE
# endif
# endif /* __linux__ */
#endif /* PNG_SETJMP_SUPPORTED */
#ifdef BSD
#include <strings.h>
@ -158,6 +164,7 @@ __dont__ include it again
* them inside an appropriate ifdef/endif pair for portability.
*/
#if !defined(PNG_NO_FLOATING_POINT_SUPPORTED)
#if defined(MACOS)
/* We need to check that <math.h> hasn't already been included earlier
* as it seems it doesn't agree with <fp.h>, yet we should really use
@ -169,6 +176,7 @@ __dont__ include it again
#else
#include <math.h>
#endif
#endif
/* Codewarrior on NT has linking problems without this. */
#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
@ -473,6 +481,12 @@ __dont__ include it again
#endif
#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#ifdef PNG_NO_READ_TEXT
# define PNG_NO_READ_iTXt
# define PNG_NO_READ_tEXt
# define PNG_NO_READ_zTXt
#endif
#ifndef PNG_NO_READ_bKGD
# define PNG_READ_bKGD_SUPPORTED
# define PNG_bKGD_SUPPORTED
@ -541,13 +555,26 @@ __dont__ include it again
# define PNG_READ_zTXt_SUPPORTED
# define PNG_zTXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_USER_CHUNKS
# define PNG_READ_USER_CHUNKS_SUPPORTED
# define PNG_USER_CHUNKS_SUPPORTED
# ifdef PNG_NO_READ_UNKNOWN_CHUNKS
# undef PNG_NO_READ_UNKNOWN_CHUNKS
# endif
# ifdef PNG_NO_HANDLE_AS_UNKNOWN
# undef PNG_NO_HANDLE_AS_UNKNOWN
# endif
#endif
#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
# define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
# define PNG_UNKNOWN_CHUNKS_SUPPORTED
# ifndef PNG_NO_HANDLE_AS_UNKNOWN
# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# endif
#endif
#ifndef PNG_NO_READ_OPT_PLTE
#define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
#endif /* PLTE chunk in RGB and RGBA images */
# define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
#endif /* optional PLTE chunk in RGB and RGBA images */
#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
defined(PNG_READ_zTXt_SUPPORTED)
# define PNG_READ_TEXT_SUPPORTED
@ -556,6 +583,11 @@ __dont__ include it again
#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#ifdef PNG_NO_WRITE_TEXT
# define PNG_NO_WRITE_iTXt
# define PNG_NO_WRITE_tEXt
# define PNG_NO_WRITE_zTXt
#endif
#ifndef PNG_NO_WRITE_bKGD
# define PNG_WRITE_bKGD_SUPPORTED
# ifndef PNG_bKGD_SUPPORTED
@ -663,6 +695,11 @@ __dont__ include it again
# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
# define PNG_UNKNOWN_CHUNKS_SUPPORTED
# endif
# ifndef PNG_NO_HANDLE_AS_UNKNOWN
# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
# endif
# endif
#endif
#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
defined(PNG_WRITE_zTXt_SUPPORTED)
@ -673,8 +710,16 @@ __dont__ include it again
#endif
#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
/* Turn this off to disable png_read_png() and
* png_write_png() and leave the image_bits member
* out of the info structure.
*/
#ifndef PNG_NO_INFO_IMAGE
# define PNG_INFO_IMAGE_SUPPORTED
#endif
/* need the time information for reading tIME chunks */
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
#if defined(PNG_tIME_SUPPORTED)
# include <time.h>
#endif
@ -758,6 +803,10 @@ typedef size_t png_size_t;
#define FARDATA
#endif
/* Typedef for floating-point numbers that are converted
to fixed-point with a multiple of 100,000, e.g., int_gamma */
typedef png_int_32 png_fixed_point;
/* Add typedefs for pointers */
typedef void FAR * png_voidp;
typedef png_byte FAR * png_bytep;
@ -767,6 +816,7 @@ typedef png_uint_16 FAR * png_uint_16p;
typedef png_int_16 FAR * png_int_16p;
typedef PNG_CONST char FAR * png_const_charp;
typedef char FAR * png_charp;
typedef png_fixed_point FAR * png_fixed_point_p;
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR * png_doublep;
#endif
@ -779,6 +829,7 @@ typedef png_uint_16 FAR * FAR * png_uint_16pp;
typedef png_int_16 FAR * FAR * png_int_16pp;
typedef PNG_CONST char FAR * FAR * png_const_charpp;
typedef char FAR * FAR * png_charpp;
typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR * FAR * png_doublepp;
#endif
@ -848,6 +899,10 @@ typedef z_stream FAR * png_zstreamp;
* that are passed far data must be model independent.
*/
#ifndef PNG_ABORT
# define PNG_ABORT() abort()
#endif
#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
/* use this to make far-to-near assignments */
# define CHECK 1

23
pngerror.c
View File

@ -1,11 +1,11 @@
/* pngerror.c - stub functions for i/o and memory allocation
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file provides a location for all error handling. Users who
* need special error handling are expected to write replacement functions
@ -67,21 +67,26 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
{
int iout = 0, iin = 0;
while (iin < 4) {
while (iin < 4)
{
int c = png_ptr->chunk_name[iin++];
if (isnonalpha(c)) {
if (isnonalpha(c))
{
buffer[iout++] = '[';
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
buffer[iout++] = png_digit[c & 0xf];
buffer[iout++] = png_digit[c & 0x0f];
buffer[iout++] = ']';
} else {
}
else
{
buffer[iout++] = (png_byte)c;
}
}
if (message == NULL)
buffer[iout] = 0;
else {
else
{
buffer[iout++] = ':';
buffer[iout++] = ' ';
png_memcpy(buffer+iout, message, 64);
@ -117,6 +122,7 @@ png_default_error(png_structp png_ptr, png_const_charp message)
fprintf(stderr, "libpng error: %s\n", message);
#endif
#ifdef PNG_SETJMP_SUPPORTED
# ifdef USE_FAR_KEYWORD
{
jmp_buf jmpbuf;
@ -126,6 +132,9 @@ png_default_error(png_structp png_ptr, png_const_charp message)
# else
longjmp(png_ptr->jmpbuf, 1);
# endif
#else
PNG_ABORT();
#endif
}
/* This function is called when there is a warning, but the library thinks

4633
pnggccrd.c Normal file
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File diff suppressed because it is too large Load Diff

67
pngget.c
View File

@ -1,11 +1,11 @@
/* pngget.c - retrieval of values from info struct
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
@ -277,7 +277,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
{
png_uint_32 retval = 0;
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
png_debug1(1, "in %s retrieval function\n", "pHYs");
if (res_x != NULL)
@ -304,7 +304,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
return (retval);
}
#endif /* PNG_READ_pHYs_SUPPORTED */
#endif /* PNG_INCH_CONVERSIONS $$ PNG_FLOATING_POINT_SUPPORTED */
#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
/* png_get_channels really belongs in here, too, but it's been around longer */
@ -378,9 +378,9 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32
png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *white_x, png_uint_32 *white_y, png_uint_32 *red_x,
png_uint_32 *red_y, png_uint_32 *green_x, png_uint_32 *green_y,
png_uint_32 *blue_x, png_uint_32 *blue_y)
png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
png_fixed_point *blue_x, png_fixed_point *blue_y)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
{
@ -423,10 +423,9 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
return (0);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32
png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *int_file_gamma)
png_fixed_point *int_file_gamma)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
&& int_file_gamma != NULL)
@ -438,7 +437,6 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
return (0);
}
#endif
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
png_uint_32
@ -459,7 +457,7 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
png_uint_32
png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
png_charpp name, int *compression_type,
png_charpp profile, png_int_32 *proflen)
png_charpp profile, png_uint_32 *proflen)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
&& name != NULL && profile != NULL && proflen != NULL)
@ -477,7 +475,7 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
}
#endif
#if defined(PNG_READ_sPLT_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
#if defined(PNG_READ_sPLT_SUPPORTED)
png_uint_32
png_get_spalettes(png_structp png_ptr, png_infop info_ptr,
png_spalette_pp spalettes)
@ -573,8 +571,8 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
png_charp *units, png_charpp *params)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL &&
purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
&& purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
nparams != NULL && units != NULL && params != NULL)
{
png_debug1(1, "in %s retrieval function\n", "pCAL");
@ -595,9 +593,10 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_uint_32
png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
png_charpp unit, double *width, double *height)
int *unit, double *width, double *height)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sCAL)
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_sCAL))
{
*unit = info_ptr->scal_unit;
*width = info_ptr->scal_pixel_width;
@ -606,12 +605,14 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
}
return(0);
}
#endif
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32
png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
png_charpp unit, png_charpp width, png_charpp height)
int *unit, png_charpp width, png_charpp height)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sCAL)
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_sCAL))
{
*unit = info_ptr->scal_unit;
*width = info_ptr->scal_s_width;
@ -621,6 +622,8 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
return(0);
}
#endif
#endif
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
png_uint_32
@ -629,7 +632,8 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
{
png_uint_32 retval = 0;
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_pHYs))
{
png_debug1(1, "in %s retrieval function\n", "pHYs");
if (res_x != NULL)
@ -656,8 +660,8 @@ png_uint_32
png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
int *num_palette)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
palette != NULL)
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
&& palette != NULL)
{
png_debug1(1, "in %s retrieval function\n", "PLTE");
*palette = info_ptr->palette;
@ -672,8 +676,8 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
png_uint_32
png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT &&
sig_bit != NULL)
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
&& sig_bit != NULL)
{
png_debug1(1, "in %s retrieval function\n", "sBIT");
*sig_bit = &(info_ptr->sig_bit);
@ -707,8 +711,8 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
png_uint_32
png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME &&
mod_time != NULL)
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
&& mod_time != NULL)
{
png_debug1(1, "in %s retrieval function\n", "tIME");
*mod_time = &(info_ptr->mod_time);
@ -724,7 +728,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
png_bytep *trans, int *num_trans, png_color_16p *trans_values)
{
png_uint_32 retval = 0;
if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_debug1(1, "in %s retrieval function\n", "tRNS");
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
@ -775,3 +779,12 @@ png_get_rgb_to_gray_status (png_structp png_ptr)
return png_ptr->rgb_to_gray_status;
}
#endif
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
png_voidp
png_get_user_chunk_ptr(png_structp png_ptr)
{
return (png_ptr->user_chunk_ptr);
}
#endif

4
pngmem.c
View File

@ -1,11 +1,11 @@
/* pngmem.c - stub functions for memory allocation
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file provides a location for all memory allocation. Users who
* need special memory handling are expected to supply replacement

BIN
pngnow.png
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117
pngpread.c
View File

@ -1,11 +1,11 @@
/* pngpread.c - read a png file in push mode
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
@ -151,27 +151,30 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_READ_hIST_SUPPORTED)
PNG_hIST;
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
PNG_iCCP;
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
PNG_iTXt;
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
PNG_oFFs;
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
PNG_pCAL;
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_sCAL;
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
PNG_pHYs;
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_sBIT;
#endif
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_sCAL;
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
PNG_sRGB;
#endif
#if defined(PNG_READ_iCCP_SUPPORTED)
PNG_iCCP;
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
PNG_sPLT;
#endif
@ -447,7 +450,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
}
#endif
#if defined(PNG_READ_iTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
{
png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
}
@ -1023,6 +1026,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->lang = (char *)NULL;
text_ptr->key = key;
text_ptr->lang_key = (char *)NULL;
text_ptr->text = text;
png_set_text(png_ptr, info_ptr, text_ptr, 1);
@ -1201,8 +1205,9 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
text_ptr->lang = (char *)NULL;
text_ptr->key = key;
text_ptr->lang = (char *)NULL;
text_ptr->lang_key = (char *)NULL;
text_ptr->text = text;
png_set_text(png_ptr, info_ptr, text_ptr, 1);
@ -1246,6 +1251,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
void
png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr->buffer_size && png_ptr->current_text_left)
{
png_size_t text_size;
@ -1261,9 +1267,11 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
if (!(png_ptr->current_text_left))
{
png_textp text_ptr;
png_charp text;
png_charp lang;
png_charp key;
int comp_flag = 0;
png_charp lang;
png_charp lang_key;
png_charp text;
if (png_ptr->buffer_size < 4)
{
@ -1278,26 +1286,36 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
return;
#endif
lang = png_ptr->current_text;
key = png_ptr->current_text;
png_ptr->current_text = 0;
for (key = lang; *key; key++)
for (lang = key; *lang; lang++)
/* empty loop */ ;
if (key != lang + png_ptr->current_text_size)
key++;
if (lang != key + png_ptr->current_text_size)
lang++;
for (text = key; *text; text++)
comp_flag = *lang++;
lang++; /* skip comp_type, always zero */
for (lang_key = lang; *lang_key; lang_key++)
/* empty loop */ ;
lang_key++; /* skip NUL separator */
for (text = lang_key; *text; text++)
/* empty loop */ ;
if (text != key + png_ptr->current_text_size)
text++;
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->lang = lang;
text_ptr->compression = comp_flag + 2;
text_ptr->key = key;
text_ptr->lang = lang;
text_ptr->lang_key = lang_key;
text_ptr->text = text;
text_ptr->text_length = 0;
text_ptr->itxt_length = png_strlen(text);
png_set_text(png_ptr, info_ptr, text_ptr, 1);
@ -1307,25 +1325,70 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
#endif
/* This function is called when we haven't found a handler for this
* chunk. In the future we will have code here that can handle
* user-defined callback functions for unknown chunks before they are
* ignored or cause an error. If there isn't a problem with the
* chunk itself (ie a bad chunk name or a critical chunk), the chunk
* is (currently) silently ignored.
* chunk. If there isn't a problem with the chunk itself (ie a bad chunk
* name or a critical chunk), the chunk is (currently) silently ignored.
*/
void
png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_uint_32 skip=0;
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
if (!(png_ptr->chunk_name[0] & 0x20))
{
if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
HANDLE_CHUNK_ALWAYS
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
&& png_ptr->read_user_chunk_fn == (png_user_chunk_ptr)NULL
#endif
)
png_chunk_error(png_ptr, "unknown critical chunk");
/* to quiet some compiler warnings */
if(info_ptr == NULL) return;
/* to quiet compiler warnings about unused info_ptr */
if (info_ptr == NULL)
return;
}
png_push_crc_skip(png_ptr, length);
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
{
png_unknown_chunk chunk;
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
{
png_warning(png_ptr, "unknown chunk too large to fit in memory");
skip = length - (png_uint_32)65535L;
length = (png_uint_32)65535L;
}
#endif
strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
chunk.data = (png_bytep)png_malloc(png_ptr, length);
png_crc_read(png_ptr, chunk.data, length);
chunk.size = length;
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
if(png_ptr->read_user_chunk_fn != (png_user_chunk_ptr)NULL)
{
/* callback to user unknown chunk handler */
if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
{
if (!(png_ptr->chunk_name[0] & 0x20))
if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
HANDLE_CHUNK_ALWAYS)
png_chunk_error(png_ptr, "unknown critical chunk");
}
png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
}
else
#endif
png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
png_free(png_ptr, chunk.data);
}
else
#endif
skip=length;
png_push_crc_skip(png_ptr, skip);
}
void

210
pngread.c
View File

@ -1,11 +1,11 @@
/* pngread.c - read a PNG file
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file contains routines that an application calls directly to
* read a PNG file or stream.
@ -34,9 +34,13 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
#endif /* PNG_USER_MEM_SUPPORTED */
png_structp png_ptr;
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
#endif
png_debug(1, "in png_create_read_struct\n");
#ifdef PNG_USER_MEM_SUPPORTED
if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
@ -47,6 +51,8 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
{
return (png_structp)NULL;
}
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
@ -60,6 +66,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
#ifdef USE_FAR_KEYWORD
png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
@ -110,17 +117,24 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
void
png_read_init(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
#endif
png_debug(1, "in png_read_init\n");
#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
#endif
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
#endif
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@ -214,7 +228,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_sBIT;
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_sCAL;
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
@ -253,10 +267,29 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
*/
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
{
if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_ptr->mode |= PNG_HAVE_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before IDAT");
else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
!(png_ptr->mode & PNG_HAVE_PLTE))
png_error(png_ptr, "Missing PLTE before IDAT");
break;
}
}
#endif
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
@ -421,7 +454,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
switch (png_ptr->pass)
{
case 0:
if (png_ptr->row_number & 7)
if (png_ptr->row_number & 0x07)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
@ -431,7 +464,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
}
break;
case 1:
if ((png_ptr->row_number & 7) || png_ptr->width < 5)
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
@ -441,7 +474,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
}
break;
case 2:
if ((png_ptr->row_number & 7) != 4)
if ((png_ptr->row_number & 0x07) != 4)
{
if (dsp_row != NULL && (png_ptr->row_number & 4))
png_combine_row(png_ptr, dsp_row,
@ -546,6 +579,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
if(png_ptr->row_buf[0])
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
@ -607,7 +641,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
* not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it.
*
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5h.
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5q.
*/
void
@ -656,7 +690,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
* only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead.
*
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5h.
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.5q.
*/
void
png_read_image(png_structp png_ptr, png_bytepp image)
@ -743,7 +777,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_READ_sBIT_SUPPORTED)
PNG_sBIT;
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
#if defined(PNG_READ_sCAL_SUPPORTED)
PNG_sCAL;
#endif
#if defined(PNG_READ_sPLT_SUPPORTED)
@ -776,6 +810,23 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
{
if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
}
else
png_ptr->mode |= PNG_AFTER_IDAT;
png_handle_unknown(png_ptr, info_ptr, length);
if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_ptr->mode |= PNG_HAVE_PLTE;
}
#endif
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
/* Zero length IDATs are legal after the last IDAT has been
@ -788,8 +839,6 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
}
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
#if defined(PNG_READ_bKGD_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
@ -933,7 +982,9 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
void
png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp;
#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
@ -1020,7 +1071,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
/* Save the important info out of the png_struct, in case it is
* being used again.
*/
#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
#endif
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
@ -1038,7 +1091,10 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
png_ptr->free_fn = free_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
#endif
}
void
@ -1046,3 +1102,131 @@ png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
png_ptr->read_row_fn = read_row_fn;
}
#if defined(PNG_INFO_IMAGE_SUPPORTED)
void png_read_png(png_structp png_ptr, png_infop info_ptr,
int transforms,
voidp params)
{
int row;
if(transforms == 0 || params == (voidp)NULL)
/* quiet compiler warnings */ ;
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel from opacity to transparency */
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
#endif
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk).
*/
png_read_info(png_ptr, info_ptr);
/* -------------- image transformations start here ------------------- */
#if defined(PNG_READ_16_TO_8_SUPPORTED)
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
if (transforms & PNG_TRANSFORM_STRIP_16)
png_set_strip_16(png_ptr);
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* Strip alpha bytes from the input data without combining with the
* background (not recommended).
*/
if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
png_set_strip_alpha(png_ptr);
#endif
#if defined(PNG_READ_PACK_SUPPORTED)
/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
* byte into separate bytes (useful for paletted and grayscale images).
*/
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
/* Change the order of packed pixels to least significant bit first
* (not useful if you are using png_set_packing). */
if (transforms & PNG_TRANSFORM_PACKSWAP)
png_set_packswap(png_ptr);
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
/* Expand paletted colors into true RGB triplets
* Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
* Expand paletted or RGB images with transparency to full alpha
* channels so the data will be available as RGBA quartets.
*/
if (transforms & PNG_TRANSFORM_EXPAND)
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
#endif
/* We don't handle background color or gamma transformation or dithering. */
#if defined(PNG_READ_INVERT_SUPPORTED)
/* invert monochrome files to have 0 as white and 1 as black */
if (transforms & PNG_TRANSFORM_INVERT_MONO)
png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED)
/* If you want to shift the pixel values from the range [0,255] or
* [0,65535] to the original [0,7] or [0,31], or whatever range the
* colors were originally in:
*/
if ((transforms & PNG_TRANSFORM_SHIFT)
&& png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
{
png_color_8p sig_bit;
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, sig_bit);
}
#endif
#if defined(PNG_READ_BGR_SUPPORTED)
/* flip the RGB pixels to BGR (or RGBA to BGRA) */
if (transforms & PNG_TRANSFORM_BGR)
png_set_bgr(png_ptr);
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_READ_SWAP_SUPPORTED)
/* swap bytes of 16 bit files to least significant byte first */
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
png_set_swap(png_ptr);
#endif
/* We don't handle adding filler bytes */
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
* update the palette for you (ie you selected such a transform above).
*/
png_read_update_info(png_ptr, info_ptr);
/* -------------- image transformations end here ------------------- */
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
info_ptr->height * sizeof(png_bytep));
for (row = 0; row < (int)info_ptr->height; row++)
info_ptr->row_pointers[row] = png_malloc(png_ptr,
png_get_rowbytes(png_ptr, info_ptr));
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
}
#endif

4
pngrio.c
View File

@ -1,11 +1,11 @@
/* pngrio.c - functions for data input
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file provides a location for all input. Users who need
* special handling are expected to write a function that has the same

100
pngrtran.c
View File

@ -1,11 +1,11 @@
/* pngrtran.c - transforms the data in a row for PNG readers
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file contains functions optionally called by an application
* in order to tell libpng how to handle data when reading a PNG.
@ -367,7 +367,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
{
int j, next_j;
if (num_new_palette & 1)
if (num_new_palette & 0x01)
{
j = p->left;
next_j = p->right;
@ -897,8 +897,8 @@ png_init_read_transformations(png_structp png_ptr)
#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
/* No GAMMA transformation */
if (png_ptr->transformations & PNG_BACKGROUND &&
color_type == PNG_COLOR_TYPE_PALETTE)
if ((png_ptr->transformations & PNG_BACKGROUND) &&
(color_type == PNG_COLOR_TYPE_PALETTE))
{
int i;
int istop = (int)png_ptr->num_trans;
@ -931,7 +931,7 @@ png_init_read_transformations(png_structp png_ptr)
#if defined(PNG_READ_SHIFT_SUPPORTED)
if ((png_ptr->transformations & PNG_SHIFT) &&
color_type == PNG_COLOR_TYPE_PALETTE)
(color_type == PNG_COLOR_TYPE_PALETTE))
{
png_uint_16 i;
png_uint_16 istop = png_ptr->num_palette;
@ -1009,7 +1009,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
#endif
#if defined(PNG_READ_16_TO_8_SUPPORTED)
if ((png_ptr->transformations & PNG_16_TO_8) && info_ptr->bit_depth == 16)
if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16))
info_ptr->bit_depth = 8;
#endif
@ -1026,7 +1026,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
#endif
#if defined(PNG_READ_PACK_SUPPORTED)
if ((png_ptr->transformations & PNG_PACK) && info_ptr->bit_depth < 8)
if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8))
info_ptr->bit_depth = 8;
#endif
@ -1057,9 +1057,9 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_READ_FILLER_SUPPORTED)
/* STRIP_ALPHA and FILLER allowed: MASK_ALPHA bit stripped above */
if (png_ptr->transformations & PNG_FILLER &&
(info_ptr->color_type == PNG_COLOR_TYPE_RGB ||
info_ptr->color_type == PNG_COLOR_TYPE_GRAY))
if ((png_ptr->transformations & PNG_FILLER) &&
((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
(info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
info_ptr->channels++;
#endif
@ -1177,7 +1177,7 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
/* if gray -> RGB, do so now only if background is non-gray; else do later
* for performance reasons */
if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
!(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
@ -1251,8 +1251,8 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
/* if gray -> RGB, do so now only if we did not do so above */
if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
png_ptr->mode & PNG_BACKGROUND_IS_GRAY)
if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
@ -1330,10 +1330,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
{
png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
png_bytep dp = row + (png_size_t)row_width - 1;
png_uint_32 shift = 7 - (int)((row_width + 7) & 7);
png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
*dp = (png_byte)((*sp >> shift) & 0x1);
*dp = (png_byte)((*sp >> shift) & 0x01);
if (shift == 7)
{
shift = 0;
@ -1351,10 +1351,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
png_bytep dp = row + (png_size_t)row_width - 1;
png_uint_32 shift = (int)((3 - ((row_width + 3) & 3)) << 1);
png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
*dp = (png_byte)((*sp >> shift) & 0x3);
*dp = (png_byte)((*sp >> shift) & 0x03);
if (shift == 6)
{
shift = 0;
@ -1371,10 +1371,10 @@ png_do_unpack(png_row_infop row_info, png_bytep row)
{
png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
png_bytep dp = row + (png_size_t)row_width - 1;
png_uint_32 shift = (int)((1 - ((row_width + 1) & 1)) << 2);
png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
for (i = 0; i < row_width; i++)
{
*dp = (png_byte)((*sp >> shift) & 0xf);
*dp = (png_byte)((*sp >> shift) & 0x0f);
if (shift == 4)
{
shift = 0;
@ -1674,9 +1674,15 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
for (i = 0; i < row_width; i++)
{
*(--dp) = (png_byte)(255 - *(--sp));
/* This does nothing:
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
We can replace it with:
*/
sp-=3;
dp=sp;
}
}
/* This inverts the alpha channel in RRGGBBAA */
@ -1690,12 +1696,18 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
{
*(--dp) = (png_byte)(255 - *(--sp));
*(--dp) = (png_byte)(255 - *(--sp));
/* This does nothing:
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
We can replace it with:
*/
sp-=6;
dp=sp;
}
}
}
@ -1725,8 +1737,12 @@ png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
{
*(--dp) = (png_byte)(255 - *(--sp));
*(--dp) = (png_byte)(255 - *(--sp));
/*
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*/
sp-=2;
dp=sp;
}
}
}
@ -2518,7 +2534,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
shift = 7;
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x1)
if ((png_uint_16)((*sp >> shift) & 0x01)
== trans_values->gray)
{
*sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
@ -2543,7 +2559,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
shift = 6;
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x3)
if ((png_uint_16)((*sp >> shift) & 0x03)
== trans_values->gray)
{
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
@ -2551,9 +2567,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
}
else
{
png_byte p = (png_byte)((*sp >> shift) & 0x3);
png_byte p = (png_byte)((*sp >> shift) & 0x03);
png_byte g = (png_byte)((gamma_table [p | (p << 2) |
(p << 4) | (p << 6)] >> 6) & 0x3);
(p << 4) | (p << 6)] >> 6) & 0x03);
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*sp |= (png_byte)(g << shift);
}
@ -2573,7 +2589,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
shift = 6;
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0x3)
if ((png_uint_16)((*sp >> shift) & 0x03)
== trans_values->gray)
{
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
@ -2599,7 +2615,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
shift = 4;
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0xf)
if ((png_uint_16)((*sp >> shift) & 0x0f)
== trans_values->gray)
{
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
@ -2607,9 +2623,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
}
else
{
png_byte p = (png_byte)((*sp >> shift) & 0xf);
png_byte p = (png_byte)((*sp >> shift) & 0x0f);
png_byte g = (png_byte)((gamma_table[p |
(p << 4)] >> 4) & 0xf);
(p << 4)] >> 4) & 0x0f);
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
*sp |= (png_byte)(g << shift);
}
@ -2629,7 +2645,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
shift = 4;
for (i = 0; i < row_width; i++)
{
if ((png_uint_16)((*sp >> shift) & 0xf)
if ((png_uint_16)((*sp >> shift) & 0x0f)
== trans_values->gray)
{
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
@ -3362,10 +3378,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
{
sp = row + (png_size_t)((row_width - 1) >> 3);
dp = row + (png_size_t)row_width - 1;
shift = 7 - (int)((row_width + 7) & 7);
shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
if ((*sp >> shift) & 0x1)
if ((*sp >> shift) & 0x01)
*dp = 1;
else
*dp = 0;
@ -3385,10 +3401,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
{
sp = row + (png_size_t)((row_width - 1) >> 2);
dp = row + (png_size_t)row_width - 1;
shift = (int)((3 - ((row_width + 3) & 3)) << 1);
shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
value = (*sp >> shift) & 0x3;
value = (*sp >> shift) & 0x03;
*dp = (png_byte)value;
if (shift == 6)
{
@ -3406,10 +3422,10 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
{
sp = row + (png_size_t)((row_width - 1) >> 1);
dp = row + (png_size_t)row_width - 1;
shift = (int)((row_width & 1) << 2);
shift = (int)((row_width & 0x01) << 2);
for (i = 0; i < row_width; i++)
{
value = (*sp >> shift) & 0xf;
value = (*sp >> shift) & 0x0f;
*dp = (png_byte)value;
if (shift == 4)
{
@ -3508,10 +3524,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
gray = (png_uint_16)(gray*0xff);
sp = row + (png_size_t)((row_width - 1) >> 3);
dp = row + (png_size_t)row_width - 1;
shift = 7 - (int)((row_width + 7) & 7);
shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
if ((*sp >> shift) & 0x1)
if ((*sp >> shift) & 0x01)
*dp = 0xff;
else
*dp = 0;
@ -3532,10 +3548,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
gray = (png_uint_16)(gray*0x55);
sp = row + (png_size_t)((row_width - 1) >> 2);
dp = row + (png_size_t)row_width - 1;
shift = (int)((3 - ((row_width + 3) & 3)) << 1);
shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
value = (*sp >> shift) & 0x3;
value = (*sp >> shift) & 0x03;
*dp = (png_byte)(value | (value << 2) | (value << 4) |
(value << 6));
if (shift == 6)
@ -3555,10 +3571,10 @@ png_do_expand(png_row_infop row_info, png_bytep row,
gray = (png_uint_16)(gray*0x11);
sp = row + (png_size_t)((row_width - 1) >> 1);
dp = row + (png_size_t)row_width - 1;
shift = (int)((1 - ((row_width + 1) & 1)) << 2);
shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
for (i = 0; i < row_width; i++)
{
value = (*sp >> shift) & 0xf;
value = (*sp >> shift) & 0x0f;
*dp = (png_byte)(value | (value << 4));
if (shift == 4)
{
@ -3809,7 +3825,7 @@ png_build_gamma_table(png_structp png_ptr)
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
{
g = 1.0 / (png_ptr->gamma);

316
pngrutil.c
View File

@ -1,11 +1,11 @@
/* pngrutil.c - utilities to read a PNG file
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file contains routines that are only called from within
* libpng itself during the course of reading an image.
@ -31,7 +31,7 @@ png_get_uint_32(png_bytep buf)
return (i);
}
#if defined(PNG_READ_pCAL_SUPPORTED)
#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED)
/* Grab a signed 32-bit integer from a buffer in big-endian format. The
* data is stored in the PNG file in two's complement format, and it is
* assumed that the machine format for signed integers is the same. */
@ -87,10 +87,10 @@ png_crc_finish(png_structp png_ptr, png_uint_32 skip)
if (png_crc_error(png_ptr))
{
if ((png_ptr->chunk_name[0] & 0x20 && /* Ancillary */
if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
(!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))
(png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
{
png_chunk_warning(png_ptr, "CRC error");
}
@ -455,7 +455,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#if defined (PNG_READ_tRNS_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
if (png_ptr->num_trans > png_ptr->num_palette)
{
@ -482,7 +482,7 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
return;
}
png_ptr->mode |= PNG_AFTER_IDAT | PNG_HAVE_IEND;
png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
if (length != 0)
{
@ -495,7 +495,7 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void
png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_uint_32 igamma;
png_fixed_point igamma;
#ifdef PNG_FLOATING_POINT_SUPPORTED
float file_gamma;
#endif
@ -515,7 +515,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place gAMA chunk");
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_gAMA
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
#if defined(PNG_READ_sRGB_SUPPORTED)
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
@ -537,7 +537,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
if (png_crc_finish(png_ptr, 0))
return;
igamma = png_get_uint_32(buf);
igamma = (png_fixed_point)png_get_uint_32(buf);
/* check for zero gamma */
if (igamma == 0)
return;
@ -549,7 +549,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "igamma = %lu\n", igamma);
fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
#endif
return;
}
@ -592,7 +592,7 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sBIT chunk");
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
{
png_warning(png_ptr, "Duplicate sBIT chunk");
png_crc_finish(png_ptr, length);
@ -642,13 +642,13 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#ifdef PNG_FLOATING_POINT_SUPPORTED
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
#endif
png_uint_32 int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
int_y_green, int_x_blue, int_y_blue;
png_debug(1, "in png_handle_cHRM\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before sBIT");
png_error(png_ptr, "Missing IHDR before cHRM");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid cHRM after IDAT");
@ -659,7 +659,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before cHRM");
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
#if defined(PNG_READ_sRGB_SUPPORTED)
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
@ -678,10 +678,10 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
png_crc_read(png_ptr, buf, 4);
int_x_white = png_get_uint_32(buf);
int_x_white = (png_fixed_point)png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
int_y_white = png_get_uint_32(buf);
int_y_white = (png_fixed_point)png_get_uint_32(buf);
if (int_x_white > 80000L || int_y_white > 80000L ||
int_x_white + int_y_white > 100000L)
@ -692,10 +692,10 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
png_crc_read(png_ptr, buf, 4);
int_x_red = png_get_uint_32(buf);
int_x_red = (png_fixed_point)png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
int_y_red = png_get_uint_32(buf);
int_y_red = (png_fixed_point)png_get_uint_32(buf);
if (int_x_red > 80000L || int_y_red > 80000L ||
int_x_red + int_y_red > 100000L)
@ -706,10 +706,10 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
png_crc_read(png_ptr, buf, 4);
int_x_green = png_get_uint_32(buf);
int_x_green = (png_fixed_point)png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
int_y_green = png_get_uint_32(buf);
int_y_green = (png_fixed_point)png_get_uint_32(buf);
if (int_x_green > 80000L || int_y_green > 80000L ||
int_x_green + int_y_green > 100000L)
@ -720,10 +720,10 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
png_crc_read(png_ptr, buf, 4);
int_x_blue = png_get_uint_32(buf);
int_x_blue = (png_fixed_point)png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
int_y_blue = png_get_uint_32(buf);
int_y_blue = (png_fixed_point)png_get_uint_32(buf);
if (int_x_blue > 80000L || int_y_blue > 80000L ||
int_x_blue + int_y_blue > 100000L)
@ -743,20 +743,17 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
blue_y = (float)int_y_blue / (float)100000.0;
#endif
if (png_crc_finish(png_ptr, 0))
return;
#if defined(PNG_READ_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
{
if (abs((int)int_x_white - 31270L) > 1000 ||
abs((int)int_y_white - 32900L) > 1000 ||
abs((int) int_x_red - 64000L) > 1000 ||
abs((int) int_y_red - 33000L) > 1000 ||
abs((int)int_x_green - 30000L) > 1000 ||
abs((int)int_y_green - 60000L) > 1000 ||
abs((int) int_x_blue - 15000L) > 1000 ||
abs((int) int_y_blue - 6000L) > 1000)
if (abs(int_x_white - 31270L) > 1000 ||
abs(int_y_white - 32900L) > 1000 ||
abs( int_x_red - 64000L) > 1000 ||
abs( int_y_red - 33000L) > 1000 ||
abs(int_x_green - 30000L) > 1000 ||
abs(int_y_green - 60000L) > 1000 ||
abs( int_x_blue - 15000L) > 1000 ||
abs( int_y_blue - 6000L) > 1000)
{
png_warning(png_ptr,
@ -768,13 +765,14 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
green_x, green_y, blue_x, blue_y);
#else
fprintf(stderr,"wx=%d, wy=%d, rx=%d, ry=%d\n",
fprintf(stderr,"wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
int_x_white, int_y_white, int_x_red, int_y_red);
fprintf(stderr,"gx=%d, gy=%d, bx=%d, by=%d\n",
fprintf(stderr,"gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
int_x_green, int_y_green, int_x_blue, int_y_blue);
#endif
#endif /* PNG_NO_CONSOLE_IO */
}
png_crc_finish(png_ptr, 0);
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
@ -788,6 +786,8 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
int_y_green, int_x_blue, int_y_blue);
#endif
if (png_crc_finish(png_ptr, 0))
return;
}
#endif
@ -796,7 +796,6 @@ void
png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
int intent;
int igamma;
png_byte buf[1];
png_debug(1, "in png_handle_sRGB\n");
@ -813,7 +812,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sRGB chunk");
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
{
png_warning(png_ptr, "Duplicate sRGB chunk");
png_crc_finish(png_ptr, length);
@ -840,38 +839,43 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
}
#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
igamma=png_ptr->gamma * 100000.;
#else
# ifdef PNG_FIXED_POINT_SUPPORTED
igamma=(int)png_ptr->int_gamma;
# endif
#endif
if ((info_ptr->valid & PNG_INFO_gAMA))
{
int igamma;
#ifdef PNG_FIXED_POINT_SUPPORTED
igamma=(int)info_ptr->int_gamma;
#else
# ifdef PNG_FLOATING_POINT_SUPPORTED
igamma=info_ptr->gamma * 100000.;
# endif
#endif
if(igamma < 45000L || igamma > 46000L)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
#ifdef PNG_FLOATING_POINT_SUPPORTED
fprintf(stderr,"gamma=%f\n",png_ptr->gamma);
# ifdef PNG_FIXED_POINT_SUPPORTED
fprintf(stderr,"incorrect gamma=(%d/100000)\n",(int)png_ptr->int_gamma);
# else
fprintf(stderr,"gamma=%d\n",png_ptr->int_gamma);
# ifdef PNG_FLOATING_POINT_SUPPORTED
fprintf(stderr,"incorrect gamma=%f\n",png_ptr->gamma);
# endif
# endif
#endif
}
}
#endif /* PNG_READ_gAMA_SUPPORTED */
#ifdef PNG_READ_cHRM_SUPPORTED
if (info_ptr->valid & PNG_INFO_cHRM)
if (abs((int)info_ptr->int_x_white - 31270L) > 1000 ||
abs((int)info_ptr->int_y_white - 32900L) > 1000 ||
abs((int) info_ptr->int_x_red - 64000L) > 1000 ||
abs((int) info_ptr->int_y_red - 33000L) > 1000 ||
abs((int)info_ptr->int_x_green - 30000L) > 1000 ||
abs((int)info_ptr->int_y_green - 60000L) > 1000 ||
abs((int) info_ptr->int_x_blue - 15000L) > 1000 ||
abs((int) info_ptr->int_y_blue - 6000L) > 1000)
if (abs(info_ptr->int_x_white - 31270L) > 1000 ||
abs(info_ptr->int_y_white - 32900L) > 1000 ||
abs( info_ptr->int_x_red - 64000L) > 1000 ||
abs( info_ptr->int_y_red - 33000L) > 1000 ||
abs(info_ptr->int_x_green - 30000L) > 1000 ||
abs(info_ptr->int_y_green - 60000L) > 1000 ||
abs( info_ptr->int_x_blue - 15000L) > 1000 ||
abs( info_ptr->int_y_blue - 6000L) > 1000)
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
@ -907,7 +911,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place iCCP chunk");
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_iCCP)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
{
png_warning(png_ptr, "Duplicate iCCP chunk");
png_crc_finish(png_ptr, length);
@ -982,16 +986,6 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (png_ptr->mode & PNG_HAVE_PLTE)
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sPLT chunk");
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sPLT)
{
png_warning(png_ptr, "Duplicate sPLT chunk");
png_crc_finish(png_ptr, length);
return;
}
#ifdef PNG_MAX_MALLOC_64K
if (length > (png_uint_32)65535L)
@ -1085,7 +1079,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_warning(png_ptr, "Duplicate tRNS chunk");
png_crc_finish(png_ptr, length);
@ -1188,7 +1182,7 @@ png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_bKGD)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
{
png_warning(png_ptr, "Duplicate bKGD chunk");
png_crc_finish(png_ptr, length);
@ -1276,7 +1270,7 @@ png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_hIST)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
{
png_warning(png_ptr, "Duplicate hIST chunk");
png_crc_finish(png_ptr, length);
@ -1327,7 +1321,7 @@ png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
png_warning(png_ptr, "Duplicate pHYS chunk");
png_crc_finish(png_ptr, length);
@ -1370,7 +1364,7 @@ png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
{
png_warning(png_ptr, "Duplicate oFFs chunk");
png_crc_finish(png_ptr, length);
@ -1418,7 +1412,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
{
png_warning(png_ptr, "Duplicate pCAL chunk");
png_crc_finish(png_ptr, length);
@ -1517,10 +1511,14 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void
png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_charp unit, swidth, sheight, ep;
png_charp buffer, ep;
#ifdef PNG_FLOATING_POINT_SUPPORTED
double width=0., height=0.;
png_charp vp;
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_charp swidth, sheight;
#endif
#endif
png_size_t slength;
@ -1534,7 +1532,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sCAL)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
{
png_warning(png_ptr, "Duplicate sCAL chunk");
png_crc_finish(png_ptr, length);
@ -1543,32 +1541,32 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_debug1(2, "Allocating and reading sCAL chunk data (%d bytes)\n",
length + 1);
unit = (png_charp)png_malloc(png_ptr, length + 1);
buffer = (png_charp)png_malloc(png_ptr, length + 1);
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)unit, slength);
png_crc_read(png_ptr, (png_bytep)buffer, slength);
if (png_crc_finish(png_ptr, 0))
{
png_free(png_ptr, unit);
png_free(png_ptr, buffer);
return;
}
unit[slength] = 0x00; /* null terminate the last string */
buffer[slength] = 0x00; /* null terminate the last string */
png_debug(3, "Finding end of sCAL unit string\n");
for (ep = unit; *ep; ep++)
/* empty loop */ ;
ep++;
ep = buffer + 1; /* skip unit byte */
#ifdef PNG_FLOATING_POINT_SUPPORTED
width = strtod(ep, &vp);
if (*vp)
png_error(png_ptr, "malformed width string in sCAL chunk");
#endif
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
swidth = (png_charp)png_malloc(png_ptr, strlen(ep) + 1);
png_memcpy(swidth, ep, (png_size_t)strlen(ep));
#endif
#endif
for (ep = unit; *ep; ep++)
for (ep = buffer; *ep; ep++)
/* empty loop */ ;
ep++;
@ -1576,32 +1574,42 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
height = strtod(ep, &vp);
if (*vp)
png_error(png_ptr, "malformed height string in sCAL chunk");
#endif
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
sheight = (png_charp)png_malloc(png_ptr, strlen(ep) + 1);
png_memcpy(sheight, ep, (png_size_t)strlen(ep));
#endif
#endif
if (unit + slength < ep
if (buffer + slength < ep
#ifdef PNG_FLOATING_POINT_SUPPORTED
|| width <= 0. || height <= 0.
#endif
)
{
png_warning(png_ptr, "Invalid sCAL data");
png_free(png_ptr, unit);
png_free(png_ptr, buffer);
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, swidth);
png_free(png_ptr, sheight);
#endif
return;
}
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_sCAL(png_ptr, info_ptr, unit, width, height);
#endif
png_set_sCAL(png_ptr, info_ptr, buffer[0], width, height);
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight);
png_set_sCAL_s(png_ptr, info_ptr, buffer[0], swidth, sheight);
#endif
#endif
png_free(png_ptr, unit);
png_free(png_ptr, buffer);
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
png_free(png_ptr, swidth);
png_free(png_ptr, sheight);
#endif
}
#endif
@ -1616,7 +1624,7 @@ png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Out of place tIME chunk");
else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME)
else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
{
png_warning(png_ptr, "Duplicate tIME chunk");
png_crc_finish(png_ptr, length);
@ -1696,9 +1704,12 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->lang = NULL;
text_ptr->key = key;
text_ptr->lang = NULL;
text_ptr->lang_key = NULL;
text_ptr->text = text;
text_ptr->text_length = png_strlen(text);
text_ptr->itxt_length = 0;
png_set_text(png_ptr, info_ptr, text_ptr, 1);
@ -1759,7 +1770,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
else
{
comp_type = *(++text);
text++; /* skip the compression byte */
text++; /* skip the compression_method byte */
}
prefix_len = text - chunkdata;
@ -1770,7 +1781,10 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
text_ptr->compression = comp_type;
text_ptr->lang = NULL;
text_ptr->key = chunkdata;
text_ptr->lang_key = NULL;
text_ptr->text = chunkdata + prefix_len;
text_ptr->text_length = png_strlen(text);
text_ptr->itxt_length = 0;
png_set_text(png_ptr, info_ptr, text_ptr, 1);
@ -1786,9 +1800,9 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_textp text_ptr;
png_charp chunkdata;
png_charp lang, text;
int comp_type = PNG_TEXT_COMPRESSION_NONE;
int comp_flag = 0;
png_charp key, lang, text, lang_key;
int comp_flag = PNG_TEXT_COMPRESSION_NONE;
int comp_type = 0;
png_size_t slength, prefix_len;
png_debug(1, "in png_handle_iTXt\n");
@ -1825,10 +1839,13 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
/* empty loop */ ;
lang++; /* skip NUL separator */
/* iTXt must have a language tag and some text after the keyword */
/* iTXt must have a language tag (possibly empty), two compression bytes,
translated keyword (possibly empty), and possibly some text after the
keyword */
if (lang >= chunkdata + slength)
{
comp_type = PNG_TEXT_COMPRESSION_NONE;
comp_flag = PNG_TEXT_COMPRESSION_NONE;
png_warning(png_ptr, "Zero length iTXt chunk");
}
else
@ -1837,38 +1854,36 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
comp_type = *lang++;
}
for (text = lang; *text; text++)
for (lang_key = lang; *lang_key; lang_key++)
/* empty loop */ ;
lang_key++; /* skip NUL separator */
for (text = lang_key; *text; text++)
/* empty loop */ ;
text++; /* skip NUL separator */
prefix_len = text - chunkdata;
key=chunkdata;
if (comp_flag)
chunkdata = png_decompress_chunk(png_ptr, comp_type, chunkdata,
(size_t)length, prefix_len);
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
text_ptr->compression = (png_byte)comp_type;
text_ptr->lang = NULL;
text_ptr->compression = (int)comp_flag + 1;
text_ptr->lang_key = chunkdata+(lang_key-key);
text_ptr->lang = chunkdata+(lang-key);
text_ptr->key = chunkdata;
text_ptr->text = chunkdata + prefix_len;
text_ptr->text_length = 0;
text_ptr->itxt_length = png_strlen(text_ptr->text);
png_set_text(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr->key);
png_free(png_ptr, text_ptr);
png_free(png_ptr, chunkdata);
}
#endif
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
void
png_set_keep_unknown_chunks(png_structp png_ptr)
{
png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
}
#endif
/* This function is called when we haven't found a handler for a
chunk. If there isn't a problem with the chunk itself (ie bad
chunk name, CRC, or a critical chunk), the chunk is silently ignored
@ -1882,21 +1897,25 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_debug(1, "in png_handle_unknown\n");
if (png_ptr->mode & PNG_HAVE_IDAT)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
#endif
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
png_ptr->mode |= PNG_AFTER_IDAT;
}
/* In the future we can have code here that calls user-supplied
* callback functions for unknown chunks before they are ignored or
* cause an error.
*/
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
if (!(png_ptr->chunk_name[0] & 0x20))
{
if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
HANDLE_CHUNK_ALWAYS
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
&& png_ptr->read_user_chunk_fn == (png_user_chunk_ptr)NULL
#endif
)
png_chunk_error(png_ptr, "unknown critical chunk");
/* to quiet compiler warnings about unused info_ptr */
if (info_ptr == NULL)
return;
}
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@ -1912,11 +1931,25 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
length = (png_uint_32)65535L;
}
#endif
strcpy(chunk.name, png_ptr->chunk_name);
strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
chunk.data = (png_bytep)png_malloc(png_ptr, length);
png_crc_read(png_ptr, chunk.data, length);
chunk.size = length;
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
if(png_ptr->read_user_chunk_fn != (png_user_chunk_ptr)NULL)
{
/* callback to user unknown chunk handler */
if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
{
if (!(png_ptr->chunk_name[0] & 0x20))
if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
HANDLE_CHUNK_ALWAYS)
png_chunk_error(png_ptr, "unknown critical chunk");
png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
}
}
else
#endif
png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
png_free(png_ptr, chunk.data);
}
@ -1925,6 +1958,11 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
skip = length;
png_crc_finish(png_ptr, skip);
#if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
if (info_ptr == NULL)
/* quiet compiler warnings about unused info_ptr */ ;
#endif
}
/* This function is called to verify that a chunk name is valid.
@ -2008,7 +2046,7 @@ png_combine_row
{
int value;
value = (*sp >> shift) & 0x1;
value = (*sp >> shift) & 0x01;
*dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
@ -2061,7 +2099,7 @@ png_combine_row
{
if (m & mask)
{
value = (*sp >> shift) & 0x3;
value = (*sp >> shift) & 0x03;
*dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
@ -2203,8 +2241,8 @@ png_do_read_interlace
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
sshift = (int)((row_info->width + 7) & 7);
dshift = (int)((final_width + 7) & 7);
sshift = (int)((row_info->width + 7) & 0x07);
dshift = (int)((final_width + 7) & 0x07);
s_start = 7;
s_end = 0;
s_inc = -1;
@ -2212,8 +2250,8 @@ png_do_read_interlace
else
#endif
{
sshift = 7 - (int)((row_info->width + 7) & 7);
dshift = 7 - (int)((final_width + 7) & 7);
sshift = 7 - (int)((row_info->width + 7) & 0x07);
dshift = 7 - (int)((final_width + 7) & 0x07);
s_start = 0;
s_end = 7;
s_inc = 1;
@ -2221,7 +2259,7 @@ png_do_read_interlace
for (i = 0; i < row_info->width; i++)
{
v = (png_byte)((*sp >> sshift) & 0x1);
v = (png_byte)((*sp >> sshift) & 0x01);
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
@ -2256,8 +2294,8 @@ png_do_read_interlace
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
sshift = (int)(((row_info->width + 3) & 3) << 1);
dshift = (int)(((final_width + 3) & 3) << 1);
sshift = (int)(((row_info->width + 3) & 0x03) << 1);
dshift = (int)(((final_width + 3) & 0x03) << 1);
s_start = 6;
s_end = 0;
s_inc = -2;
@ -2265,8 +2303,8 @@ png_do_read_interlace
else
#endif
{
sshift = (int)((3 - ((row_info->width + 3) & 3)) << 1);
dshift = (int)((3 - ((final_width + 3) & 3)) << 1);
sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
s_start = 0;
s_end = 6;
s_inc = 2;
@ -2277,7 +2315,7 @@ png_do_read_interlace
png_byte v;
int j;
v = (png_byte)((*sp >> sshift) & 0x3);
v = (png_byte)((*sp >> sshift) & 0x03);
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
@ -2312,8 +2350,8 @@ png_do_read_interlace
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
sshift = (int)(((row_info->width + 1) & 1) << 2);
dshift = (int)(((final_width + 1) & 1) << 2);
sshift = (int)(((row_info->width + 1) & 0x01) << 2);
dshift = (int)(((final_width + 1) & 0x01) << 2);
s_start = 4;
s_end = 0;
s_inc = -4;
@ -2321,8 +2359,8 @@ png_do_read_interlace
else
#endif
{
sshift = (int)((1 - ((row_info->width + 1) & 1)) << 2);
dshift = (int)((1 - ((final_width + 1) & 1)) << 2);
sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
s_start = 0;
s_end = 4;
s_inc = 4;

239
pngset.c
View File

@ -1,11 +1,11 @@
/* pngset.c - storage of image information into info struct
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* The functions here are used during reads to store data from the file
* into the info struct, and during writes to store application data
@ -48,15 +48,25 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
info_ptr->y_green = (float)green_y;
info_ptr->x_blue = (float)blue_x;
info_ptr->y_blue = (float)blue_y;
#ifdef PNG_FIXED_POINT_SUPPORTED
info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
info_ptr->int_x_red = (png_fixed_point)(red_x*100000.+0.5);
info_ptr->int_y_red = (png_fixed_point)(red_y*100000.+0.5);
info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
info_ptr->int_x_blue = (png_fixed_point)(blue_x*100000.+0.5);
info_ptr->int_y_blue = (png_fixed_point)(blue_y*100000.+0.5);
#endif
info_ptr->valid |= PNG_INFO_cHRM;
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
void
png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
png_uint_32 white_x, png_uint_32 white_y, png_uint_32 red_x,
png_uint_32 red_y, png_uint_32 green_x, png_uint_32 green_y,
png_uint_32 blue_x, png_uint_32 blue_y)
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
png_fixed_point blue_x, png_fixed_point blue_y)
{
png_debug1(1, "in %s storage function\n", "cHRM");
if (png_ptr == NULL || info_ptr == NULL)
@ -70,6 +80,16 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
info_ptr->int_y_green = green_y;
info_ptr->int_x_blue = blue_x;
info_ptr->int_y_blue = blue_y;
#ifdef PNG_FLOATING_POINT_SUPPORTED
info_ptr->x_white = (float)(white_x/100000.);
info_ptr->y_white = (float)(white_y/100000.);
info_ptr->x_red = (float)(red_x/100000.);
info_ptr->y_red = (float)(red_y/100000.);
info_ptr->x_green = (float)(green_x/100000.);
info_ptr->y_green = (float)(green_y/100000.);
info_ptr->x_blue = (float)(blue_x/100000.);
info_ptr->y_blue = (float)(blue_y/100000.);
#endif
info_ptr->valid |= PNG_INFO_cHRM;
}
#endif
@ -92,21 +112,20 @@ png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
}
#endif
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
void
png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_uint_32 int_gamma)
png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
int_gamma)
{
png_debug1(1, "in %s storage function\n", "gAMA");
if (png_ptr == NULL || info_ptr == NULL)
return;
#ifdef PNG_FLOATING_POINT_SUPPORTED
info_ptr->gamma = (float)int_gamma/100000.;
info_ptr->gamma = (float)(int_gamma/100000.);
#endif
info_ptr->int_gamma = int_gamma;
info_ptr->valid |= PNG_INFO_gAMA;
}
#endif
#if defined(PNG_hIST_SUPPORTED)
void
@ -116,7 +135,9 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->hist = hist;
info_ptr->hist = png_malloc(png_ptr, sizeof(png_uint_16) *
info_ptr->num_palette);
png_memcpy(info_ptr->hist, hist, sizeof(png_uint_16) * info_ptr->num_palette);
info_ptr->valid |= PNG_INFO_hIST;
}
#endif
@ -226,27 +247,23 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
#ifdef PNG_FLOATING_POINT_SUPPORTED
void
png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
png_charp unit, double width, double height)
int unit, double width, double height)
{
png_uint_32 length;
png_debug1(1, "in %s storage function\n", "sCAL");
if (png_ptr == NULL || info_ptr == NULL)
return;
length = png_strlen(unit) + 1;
png_debug1(3, "allocating unit for info (%d bytes)\n", length);
info_ptr->scal_unit = (png_charp)png_malloc(png_ptr, length);
png_memcpy(info_ptr->scal_unit, unit, (png_size_t)length);
info_ptr->scal_unit = (png_byte)unit;
info_ptr->scal_pixel_width = width;
info_ptr->scal_pixel_height = height;
info_ptr->valid |= PNG_INFO_sCAL;
}
#endif
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
void
png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
png_charp unit, png_charp swidth, png_charp sheight)
int unit, png_charp swidth, png_charp sheight)
{
png_uint_32 length;
@ -254,10 +271,7 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
if (png_ptr == NULL || info_ptr == NULL)
return;
length = png_strlen(unit) + 1;
png_debug1(3, "allocating unit for info (%d bytes)\n", length);
info_ptr->scal_unit = (png_charp)png_malloc(png_ptr, length);
png_memcpy(info_ptr->scal_unit, unit, (png_size_t)length);
info_ptr->scal_unit = (png_byte)unit;
length = png_strlen(swidth) + 1;
png_debug1(3, "allocating unit for info (%d bytes)\n", length);
@ -272,6 +286,8 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
info_ptr->valid |= PNG_INFO_sCAL;
}
#endif
#endif
#endif
#if defined(PNG_pHYs_SUPPORTED)
void
@ -293,13 +309,21 @@ void
png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
png_colorp palette, int num_palette)
{
png_size_t length = (png_size_t)(3*num_palette);
png_debug1(1, "in %s storage function\n", "PLTE");
if (png_ptr == NULL || info_ptr == NULL)
return;
info_ptr->palette = palette;
png_debug1(3, "allocating PLTE for info (%d bytes)\n", length);
info_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)num_palette,
sizeof (png_color));
png_memcpy(info_ptr->palette, palette, length);
info_ptr->num_palette = (png_uint_16)num_palette;
info_ptr->valid |= PNG_INFO_PLTE;
info_ptr->valid |= (PNG_INFO_PLTE|PNG_ALLOCATED_INFO_PLTE);
}
#if defined(PNG_sBIT_SUPPORTED)
@ -337,7 +361,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
float file_gamma;
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32 int_file_gamma;
png_fixed_point int_file_gamma;
#endif
#endif
#if defined(PNG_cHRM_SUPPORTED)
@ -345,7 +369,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32 int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
int_green_y, int_blue_x, int_blue_y;
#endif
#endif
@ -403,7 +427,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
void
png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
png_charp name, int compression_type,
png_charp profile, int proflen)
png_charp profile, png_uint_32 proflen)
{
png_debug1(1, "in %s storage function\n", "iCCP");
if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
@ -412,8 +436,8 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
info_ptr->iccp_name = png_malloc(png_ptr, png_strlen(name)+1);
strcpy(info_ptr->iccp_name, name);
info_ptr->iccp_profile = png_malloc(png_ptr, proflen);
memcpy(info_ptr->iccp_profile, profile, proflen);
info_ptr->iccp_proflen = (png_uint_32)proflen;
png_memcpy(info_ptr->iccp_profile, profile, (png_size_t)proflen);
info_ptr->iccp_proflen = proflen;
/* Compression is always zero but is here so the API and info structure
* does not have to change * if we introduce multiple compression types */
info_ptr->iccp_compression = (png_byte)compression_type;
@ -466,54 +490,87 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
for (i = 0; i < num_text; i++)
{
png_size_t text_length,key_len,lang_len,lang_key_len;
png_textp textp = &(info_ptr->text[info_ptr->num_text]);
png_charp key,text;
if (text_ptr[i].key == (png_charp)NULL)
continue;
#ifdef PNG_iTXt_SUPPORTED
textp->lang = text_ptr[i].lang;
textp->translated_key = text_ptr[i].translated_key;
#else
textp->lang = NULL;
textp->translated_key = NULL;
#endif
key_len = png_strlen(text_ptr[i].key);
if(text_ptr[i].compression > 0)
{
/* set iTXt data */
lang_len = png_strlen(text_ptr[i].lang);
lang_key_len = png_strlen(text_ptr[i].lang_key);
}
else
{
lang_len = 0;
lang_key_len = 0;
}
if (text_ptr[i].text[0] == '\0')
{
textp->text_length = 0;
text_length = 0;
if(text_ptr[i].compression > 0)
textp->compression = PNG_ITXT_COMPRESSION_NONE;
else
textp->compression = PNG_TEXT_COMPRESSION_NONE;
}
else
{
textp->text_length = png_strlen(text_ptr[i].text);
text_length = png_strlen(text_ptr[i].text);
textp->compression = text_ptr[i].compression;
}
key=text_ptr[i].key;
for (text = key; *text++;)
/* empty loop to find the byte after the zero byte after the
end of key */ ;
textp->key = (png_charp)png_malloc(png_ptr,
(png_uint_32)(text+textp->text_length - key)+1);
(png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4));
/* Caution: the calling program, not libpng, is responsible for
freeing this, if libpng wasn't the caller. */
png_debug2(2, "Allocated %d bytes at %x in png_set_text\n",
text+textp->text_length-key+1, textp->key);
key_len + lang_len + lang_key_len + text_length + 4, textp->key);
png_memcpy(textp->key, text_ptr[i].key,
(png_size_t)(text - key)); /* includes the zero-byte separator */
(png_size_t)(key_len));
*(textp->key+key_len) = '\0';
if (text_ptr[i].compression > 0)
{
textp->lang=textp->key + key_len + 1;
png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
*(textp->lang+lang_len) = '\0';
textp->lang_key=textp->lang + lang_len + 1;
png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
*(textp->lang_key+lang_key_len) = '\0';
textp->text=textp->lang_key + lang_key_len + 1;
}
else
{
textp->lang=NULL;
textp->lang_key=NULL;
textp->text=textp->key + key_len + 1;
}
textp->text = textp->key + (text-key);
if(textp->text_length)
if(text_length)
{
png_memcpy(textp->text, text_ptr[i].text,
(png_size_t)(textp->text_length));
*(textp->text+textp->text_length) = '\0';
(png_size_t)(text_length));
*(textp->text+text_length) = '\0';
}
else
textp->text--;
if(textp->compression > 0)
{
textp->text_length = 0;
textp->itxt_length = text_length;
}
else
{
textp->text_length = text_length;
textp->itxt_length = 0;
}
info_ptr->text[info_ptr->num_text]= *textp;
info_ptr->num_text++;
png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
@ -546,7 +603,8 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
if (trans != NULL)
{
info_ptr->trans = trans;
info_ptr->trans = png_malloc(png_ptr, num_trans);
png_memcpy(info_ptr->trans, trans, num_trans);
}
if (trans_values != NULL)
@ -572,7 +630,7 @@ png_set_spalettes(png_structp png_ptr,
np = (png_spalette_p)png_malloc(png_ptr,
(info_ptr->splt_palettes_num + nentries) * sizeof(png_spalette));
memcpy(np, info_ptr->splt_palettes,
png_memcpy(np, info_ptr->splt_palettes,
info_ptr->splt_palettes_num * sizeof(png_spalette));
png_free(png_ptr, info_ptr->splt_palettes);
@ -586,46 +644,53 @@ png_set_spalettes(png_structp png_ptr,
png_strcpy(to->name, from->name);
to->entries = (png_spalette_entryp)png_malloc(png_ptr,
from->nentries * sizeof(png_spalette));
memcpy(to->entries, from->entries,
png_memcpy(to->entries, from->entries,
from->nentries * sizeof(png_spalette));
to->nentries = from->nentries;
to->depth = from->depth;
}
info_ptr->splt_palettes = np;
info_ptr->splt_palettes_num += nentries;
info_ptr->valid |= PNG_INFO_sPLT;
}
#endif /* PNG_sPLT_SUPPORTED */
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
void
png_set_unknown_chunks(png_structp png_ptr,
png_infop info_ptr, png_unknown_chunkp unknowns, int nunknowns)
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
{
png_unknown_chunkp np;
int i;
np = (png_unknown_chunkp)png_malloc(png_ptr,
(info_ptr->unknown_chunks_num + nunknowns) * sizeof(png_unknown_chunk));
if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
return;
memcpy(np, info_ptr->unknown_chunks,
np = (png_unknown_chunkp)png_malloc(png_ptr,
(info_ptr->unknown_chunks_num + num_unknowns) *
sizeof(png_unknown_chunk));
png_memcpy(np, info_ptr->unknown_chunks,
info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
png_free(png_ptr, info_ptr->unknown_chunks);
for (i = 0; i < nunknowns; i++)
for (i = 0; i < num_unknowns; i++)
{
png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
png_unknown_chunkp from = unknowns + i;
png_strcpy(to->name, from->name);
png_strcpy((png_charp)to->name, (png_charp)from->name);
to->data = (png_bytep)png_malloc(png_ptr, from->size);
memcpy(to->data, from->data, from->size);
png_memcpy(to->data, from->data, from->size);
to->size = from->size;
/* note our location in the read or write sequence */
to->location = png_ptr->mode;
to->location = (png_byte)(png_ptr->mode & 0xff);
}
info_ptr->unknown_chunks = np;
info_ptr->unknown_chunks_num += nunknowns;
info_ptr->unknown_chunks_num += num_unknowns;
}
#endif
@ -640,9 +705,51 @@ png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
}
#endif
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
void
png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
chunk_list, int num_chunks)
{
png_bytep new_list, p;
int i, old_num_chunks;
if (num_chunks == 0)
{
if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
else
png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
if(keep == HANDLE_CHUNK_ALWAYS)
png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
else
png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
return;
}
if (chunk_list == NULL)
return;
old_num_chunks=png_ptr->num_chunk_list;
new_list=png_malloc(png_ptr,5*(num_chunks+old_num_chunks));
if(png_ptr->chunk_list != (png_bytep)NULL)
{
png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
png_free_chunk_list(png_ptr);
}
png_memcpy(new_list+5*old_num_chunks, chunk_list, 5*num_chunks);
for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
*p=(png_byte)keep;
png_ptr->num_chunk_list=old_num_chunks+num_chunks;
png_ptr->chunk_list=new_list;
}
#endif
#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
void
png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
png_user_chunk_ptr read_user_chunk_fn)
{
png_debug(1, "in png_set_read_user_chunk_fn\n");
png_ptr->read_user_chunk_fn = read_user_chunk_fn;
png_ptr->user_chunk_ptr = user_chunk_ptr;
}
#endif

142
pngtest.c
View File

@ -1,11 +1,11 @@
/* pngtest.c - a simple test program to test libpng
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This program reads in a PNG image, writes it out again, and then
* compares the two files. If the files are identical, this shows that
@ -15,11 +15,11 @@
*
* The program will report "FAIL" in certain legitimate cases:
* 1) when the compression level or filter selection method is changed.
* 2) when the chunk size is not 8K.
* 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
* 3) unknown ancillary chunks exist in the input file.
* 4) others not listed here...
* In these cases, it is best to check with another tool such as "pngcheck"
* to see what the differences between the two images are.
* to see what the differences between the two files are.
*
* If a filename is given on the command-line, then this file is used
* for the input, rather than the default "pngtest.png". This allows
@ -29,6 +29,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
/* Makes pngtest verbose so we can find problems (needs to be before png.h) */
#ifndef PNG_DEBUG
@ -409,7 +410,8 @@ png_default_error(png_structp png_ptr, png_const_charp message)
This piece of code can be compiled to validate max 64K allocations
by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
typedef struct memory_information {
typedef struct memory_information
{
png_uint_32 size;
png_voidp pointer;
struct memory_information FAR *next;
@ -426,7 +428,8 @@ extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
png_voidp
png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
png_debug_malloc(png_structp png_ptr, png_uint_32 size)
{
/* png_malloc has already tested for NULL; png_create_struct calls
png_debug_malloc directly, with png_ptr == NULL which is OK */
@ -451,6 +454,7 @@ png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
if(verbose)
printf("png_malloc %d bytes at %x\n",size,pinfo->pointer);
#endif
assert(pinfo->size != 12345);
return (png_voidp)(pinfo->pointer);
}
}
@ -461,7 +465,8 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL)
fprintf(STDERR, "NULL pointer to png_debug_free.\n");
if (ptr == 0) {
if (ptr == 0)
{
#if 0 /* This happens all the time. */
fprintf(STDERR, "WARNING: freeing NULL pointer\n");
#endif
@ -471,9 +476,11 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
/* Unlink the element from the list. */
{
memory_infop FAR *ppinfo = &pinformation;
for (;;) {
for (;;)
{
memory_infop pinfo = *ppinfo;
if (pinfo->pointer == ptr) {
if (pinfo->pointer == ptr)
{
*ppinfo = pinfo->next;
current_allocation -= pinfo->size;
if (current_allocation < 0)
@ -484,7 +491,8 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
png_free_default(png_ptr, pinfo);
break;
}
if (pinfo->next == NULL) {
if (pinfo->next == NULL)
{
fprintf(STDERR, "Pointer %x not found\n", ptr);
break;
}
@ -514,8 +522,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_uint_32 width, height;
int num_pass, pass;
int bit_depth, color_type;
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
#endif
char inbuf[256], outbuf[256];
@ -568,6 +578,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#ifdef PNG_USER_MEM_SUPPORTED
#endif
#ifdef PNG_SETJMP_SUPPORTED
png_debug(0, "Setting jmpbuf for read struct\n");
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
@ -604,6 +615,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
#ifdef USE_FAR_KEYWORD
png_memcpy(write_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
#endif
png_debug(0, "Initializing input and output streams\n");
@ -643,6 +655,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_set_write_user_transform_fn(write_ptr, count_zero_samples);
#endif
#define HANDLE_CHUNK_IF_SAFE 2
#define HANDLE_CHUNK_ALWAYS 3
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
png_set_keep_unknown_chunks(read_ptr, HANDLE_CHUNK_ALWAYS, NULL, 0);
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
png_set_keep_unknown_chunks(write_ptr, HANDLE_CHUNK_IF_SAFE, NULL, 0);
#endif
png_debug(0, "Reading info struct\n");
png_read_info(read_ptr, read_info_ptr);
@ -663,7 +684,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
#if defined(PNG_cHRM_SUPPORTED)
{
png_uint_32 white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
blue_y;
if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
@ -676,7 +697,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#endif
#if defined(PNG_gAMA_SUPPORTED)
{
png_uint_32 gamma;
png_fixed_point gamma;
if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
{
@ -688,7 +709,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
{
png_charp name;
png_charp profile;
png_int_32 proflen;
png_uint_32 proflen;
int compression_type;
if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
@ -740,7 +761,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#endif
#if defined(PNG_oFFs_SUPPORTED)
{
long offset_x, offset_y;
png_int_32 offset_x, offset_y;
int unit_type;
if (png_get_oFFs(read_ptr, read_info_ptr,&offset_x,&offset_y,&unit_type))
@ -788,7 +809,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#if defined(PNG_sCAL_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
{
png_charp unit;
int unit;
double width, height;
if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &width, &height))
@ -797,9 +818,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
}
#else
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
{
png_charp unit, width, height;
int unit;
png_charp width, height;
if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &width, &height))
{
@ -807,6 +829,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
}
#endif
#endif
#endif
#if defined(PNG_TEXT_SUPPORTED)
{
png_textp text_ptr;
@ -850,6 +874,24 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
}
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
{
png_unknown_chunkp unknowns;
int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
&unknowns);
if (num_unknowns)
{
png_size_t i;
png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
num_unknowns);
/* copy the locations from the read_info_ptr. The automatically
generated locations in write_info_ptr are wrong because we
haven't written anything yet */
for (i = 0; i < (png_size_t)num_unknowns; i++)
write_info_ptr->unknown_chunks[i].location = unknowns[i].location;
}
}
#endif
png_debug(0, "\nWriting info struct\n");
@ -906,7 +948,15 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
}
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
png_free_unknown_chunks(read_ptr, end_info_ptr, -1);
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
png_free_unknown_chunks(write_ptr, write_info_ptr, -1);
#endif
png_debug(0, "Reading and writing end_info data\n");
png_read_end(read_ptr, end_info_ptr);
#if defined(PNG_TEXT_SUPPORTED)
{
@ -936,6 +986,26 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
#endif /* PNG_TIME_RFC1123_SUPPORTED */
}
}
#endif
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
{
png_unknown_chunkp unknowns;
int num_unknowns;
num_unknowns = (int)png_get_unknown_chunks(read_ptr, end_info_ptr,
&unknowns);
if (num_unknowns)
{
png_size_t i;
png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
num_unknowns);
/* copy the locations from the read_info_ptr. The automatically
generated locations in write_end_info_ptr are wrong because we
haven't written the end_info yet */
for (i = 0; i < (png_size_t)num_unknowns; i++)
write_end_info_ptr->unknown_chunks[i].location =
unknowns[i].location;
}
}
#endif
png_write_end(write_ptr, write_end_info_ptr);
@ -982,16 +1052,17 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
if (num_in != num_out)
{
fprintf(STDERR, "Files %s and %s are of a different size\n",
fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
inname, outname);
if(wrote_question == 0)
{
fprintf(STDERR,
" Was %s written with the same chunk size (8k),",inname);
" Was %s written with the same maximum IDAT chunk size (%d bytes),",
inname,PNG_ZBUF_SIZE);
fprintf(STDERR,
" filtering\n heuristic (libpng default), compression");
"\n filtering heuristic (libpng default), compression");
fprintf(STDERR,
" level (zlib default)\n and zlib version (%s)?\n\n",
" level (zlib default),\n and zlib version (%s)?\n\n",
ZLIB_VERSION);
wrote_question=1;
}
@ -1009,11 +1080,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
if(wrote_question == 0)
{
fprintf(STDERR,
" Was %s written with the same chunk size (8k),",inname);
" Was %s written with the same maximum IDAT chunk size (%d bytes),",
inname,PNG_ZBUF_SIZE);
fprintf(STDERR,
" filtering\n heuristic (libpng default), compression");
"\n filtering heuristic (libpng default), compression");
fprintf(STDERR,
" level (zlib default)\n and zlib version (%s)?\n\n",
" level (zlib default),\n and zlib version (%s)?\n\n",
ZLIB_VERSION);
wrote_question=1;
}
@ -1154,12 +1226,14 @@ main(int argc, char *argv[])
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
if (current_allocation != 0) {
if (current_allocation != 0)
{
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL) {
while (pinfo != NULL)
{
fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
pinfo = pinfo->next;
}
@ -1176,7 +1250,8 @@ main(int argc, char *argv[])
else
{
int i;
for (i=0; i<3; ++i) {
for (i=0; i<3; ++i)
{
int kerror;
#ifdef PNG_USER_MEM_SUPPORTED
int allocation_now = current_allocation;
@ -1219,13 +1294,16 @@ main(int argc, char *argv[])
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
if (current_allocation != 0) {
if (current_allocation != 0)
{
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
while (pinfo != NULL) {
fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
while (pinfo != NULL)
{
fprintf(STDERR," %d bytes at %x\n",
pinfo->size, pinfo->pointer);
pinfo = pinfo->next;
}
}
@ -1263,7 +1341,7 @@ main(int argc, char *argv[])
/* Generate a compiler error if there is an old png.h in the search path. */
void
png_check_pngtest_version
(version_1_0_5h png_h_is_not_version_1_0_5h)
(version_1_0_5q png_h_is_not_version_1_0_5q)
{
if(png_h_is_not_version_1_0_5h == NULL) return;
if(png_h_is_not_version_1_0_5q == NULL) return;
}

4
pngtrans.c
View File

@ -1,11 +1,11 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL

5
pngtypes.h
View File

@ -1,10 +1,10 @@
/* pngtypes.h - array of chunk-types for libpng
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
/* Constant strings for known chunk types. If you need to add a chunk,
@ -25,6 +25,7 @@ PNG_oFFs;
PNG_pCAL;
PNG_pHYs;
PNG_sBIT;
PNG_sCAL;
PNG_sPLT;
PNG_sRGB;
PNG_tEXt;

11
pngvcrd.c
View File

@ -2,10 +2,10 @@
*
* For Intel x86 CPU and Microsoft Visual C++ compiler
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1998, Intel Corporation
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* Contributed by Nirav Chhatrapati, Intel Corporation, 1998
* Interface to libpng contributed by Gilles Vollant, 1999
@ -33,6 +33,9 @@ static int mmxsupport()
{
int mmx_supported_local = 0;
_asm {
push ebx //CPUID will trash these
push ecx
push edx
pushfd //Save Eflag to stack
pop eax //Get Eflag from stack into eax
mov ecx, eax //Make another copy of Eflag in ecx
@ -70,7 +73,9 @@ static int mmxsupport()
NOT_SUPPORTED:
mov eax, mmx_supported_local //move return value to eax
pop edx //CPUID trashed these
pop ecx
pop ebx
}
//mmx_supported_local=0; // test code for force don't support MMX

4
pngwio.c
View File

@ -1,11 +1,11 @@
/* pngwio.c - functions for data output
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*
* This file provides a location for all output. Users who need
* special handling are expected to write functions that have the same

259
pngwrite.c
View File

@ -1,11 +1,11 @@
/* pngwrite.c - general routines to write a PNG file
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
/* get internal access to png.h */
@ -24,9 +24,6 @@
void
png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_WRITE_sPLT_SUPPORTED)
int i;
#endif
png_debug(1, "in png_write_info_before_PLTE\n");
if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
{
@ -45,11 +42,11 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_WRITE_gAMA_SUPPORTED)
if (info_ptr->valid & PNG_INFO_gAMA)
{
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
#else
# ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_gAMA(png_ptr, info_ptr->gamma);
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
# endif
#endif
}
@ -63,11 +60,6 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_TEXT_COMPRESSION_NONE,
info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
#endif
#if defined(PNG_WRITE_sPLT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sPLT)
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sBIT)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
@ -75,19 +67,19 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_WRITE_cHRM_SUPPORTED)
if (info_ptr->valid & PNG_INFO_cHRM)
{
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_cHRM_fixed(png_ptr,
info_ptr->int_x_white, info_ptr->int_y_white,
info_ptr->int_x_red, info_ptr->int_y_red,
info_ptr->int_x_green, info_ptr->int_y_green,
info_ptr->int_x_blue, info_ptr->int_y_blue);
#else
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_cHRM(png_ptr,
info_ptr->x_white, info_ptr->y_white,
info_ptr->x_red, info_ptr->y_red,
info_ptr->x_green, info_ptr->y_green,
info_ptr->x_blue, info_ptr->y_blue);
#else
# ifdef PNG_FIXED_POINT_SUPPORTED
png_write_cHRM_fixed(png_ptr,
info_ptr->int_x_white, info_ptr->int_y_white,
info_ptr->int_x_red, info_ptr->int_y_red,
info_ptr->int_x_green, info_ptr->int_y_green,
info_ptr->int_x_blue, info_ptr->int_y_blue);
# endif
#endif
}
@ -102,9 +94,17 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
if (!(up->location & PNG_HAVE_PLTE))
{
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != HANDLE_CHUNK_NEVER &&
up->location && (!(up->location & PNG_HAVE_PLTE)) &&
((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
#endif
png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
}
@ -113,7 +113,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
void
png_write_info(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_WRITE_TEXT_SUPPORTED)
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
int i;
#endif
@ -132,7 +132,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel (in tRNS) */
if (png_ptr->transformations & PNG_INVERT_ALPHA &&
if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
int j;
@ -165,9 +165,16 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
#endif
#if defined(PNG_WRITE_sCAL_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sCAL)
png_write_sCAL_s(png_ptr, info_ptr->scal_unit,
#ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
info_ptr->scal_s_width, info_ptr->scal_s_height);
#endif
#endif
#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pHYs)
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
@ -180,6 +187,11 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
png_ptr->mode |= PNG_WROTE_tIME;
}
#endif
#if defined(PNG_WRITE_sPLT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sPLT)
for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
#endif
#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* Check to see if we need to write text chunks */
for (i = 0; i < info_ptr->num_text; i++)
@ -187,15 +199,15 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
png_debug2(2, "Writing header text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
/* an internationalized chunk? */
if (info_ptr->text[i].lang)
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].lang,
info_ptr->text[i].key,
info_ptr->text[i].translated_key,
info_ptr->text[i].lang,
info_ptr->text[i].lang_key,
info_ptr->text[i].text);
#else
png_warning(png_ptr, "Unable to write international text\n");
@ -204,12 +216,12 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
/* If we want a compressed text chunk */
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, info_ptr->text[i].text_length,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
png_warning(png_ptr, "Unable to write compressed text\n");
@ -223,7 +235,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text,
info_ptr->text[i].text_length);
0);
#else
png_warning(png_ptr, "Unable to write uncompressed text\n");
#endif
@ -242,9 +254,18 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
if ((up->location& PNG_HAVE_PLTE) && !(up->location& PNG_HAVE_IDAT))
{
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != HANDLE_CHUNK_NEVER &&
up->location && (up->location & PNG_HAVE_PLTE) &&
!(up->location & PNG_HAVE_IDAT) &&
((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
#endif
}
@ -268,7 +289,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* check to see if user has supplied a time chunk */
if (info_ptr->valid & PNG_INFO_tIME &&
if ((info_ptr->valid & PNG_INFO_tIME) &&
!(png_ptr->mode & PNG_WROTE_tIME))
png_write_tIME(png_ptr, &(info_ptr->mod_time));
#endif
@ -278,12 +299,29 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
{
png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
/* an internationalized chunk? */
if (info_ptr->text[i].compression > 0)
{
#if defined(PNG_WRITE_iTXt_SUPPORTED)
/* write international chunk */
png_write_iTXt(png_ptr,
info_ptr->text[i].compression,
info_ptr->text[i].key,
info_ptr->text[i].lang,
info_ptr->text[i].lang_key,
info_ptr->text[i].text);
#else
png_warning(png_ptr, "Unable to write international text\n");
#endif
/* Mark this chunk as written */
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, info_ptr->text[i].text_length,
info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
png_warning(png_ptr, "Unable to write compressed text\n");
@ -296,7 +334,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
info_ptr->text[i].text, info_ptr->text[i].text_length);
info_ptr->text[i].text, 0);
#else
png_warning(png_ptr, "Unable to write uncompressed text\n");
#endif
@ -316,9 +354,17 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
for (up = info_ptr->unknown_chunks;
up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
up++)
if (up->location & PNG_HAVE_IDAT)
{
int keep=png_handle_as_unknown(png_ptr, up->name);
if (keep != HANDLE_CHUNK_NEVER &&
up->location && (up->location & PNG_AFTER_IDAT) &&
((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
{
png_write_chunk(png_ptr, up->name, up->data, up->size);
}
}
}
#endif
}
@ -370,8 +416,10 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_structp png_ptr;
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
#endif
png_debug(1, "in png_create_write_struct\n");
#ifdef PNG_USER_MEM_SUPPORTED
@ -383,6 +431,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
{
return ((png_structp)NULL);
}
#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
@ -396,6 +446,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
#ifdef USE_FAR_KEYWORD
png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
#endif /* PNG_USER_MEM_SUPPORTED */
@ -432,17 +484,23 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
void
png_write_init(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
#endif
png_debug(1, "in png_write_init\n");
#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
#endif
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
#endif
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
@ -554,49 +612,49 @@ png_write_row(png_structp png_ptr, png_bytep row)
switch (png_ptr->pass)
{
case 0:
if (png_ptr->row_number & 7)
if (png_ptr->row_number & 0x07)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 1:
if ((png_ptr->row_number & 7) || png_ptr->width < 5)
if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 2:
if ((png_ptr->row_number & 7) != 4)
if ((png_ptr->row_number & 0x07) != 4)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 3:
if ((png_ptr->row_number & 3) || png_ptr->width < 3)
if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 4:
if ((png_ptr->row_number & 3) != 2)
if ((png_ptr->row_number & 0x03) != 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 5:
if ((png_ptr->row_number & 1) || png_ptr->width < 2)
if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 6:
if (!(png_ptr->row_number & 1))
if (!(png_ptr->row_number & 0x01))
{
png_write_finish_row(png_ptr);
return;
@ -744,6 +802,9 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
#if defined(PNG_WRITE_TEXT_SUPPORTED)
png_free_text(png_ptr, info_ptr, -1);
#endif
#if defined(PNG_WRITE_tRNS_SUPPORTED)
png_free_tRNS(png_ptr, info_ptr);
#endif
#if defined(PNG_WRITE_sCAL_SUPPORTED)
png_free_sCAL(png_ptr, info_ptr);
#endif
@ -754,10 +815,18 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
png_free_iCCP(png_ptr, info_ptr);
#endif
#if defined(PNG_WRITE_sPLT_SUPPORTED)
png_free_spalette(png_ptr, info_ptr, -1);
png_free_spalettes(png_ptr, info_ptr, -1);
#endif
#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
png_free_unknown_chunk(png_ptr, info_ptr, -1);
#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
png_free_unknown_chunks(png_ptr, info_ptr, -1);
png_free_chunk_list(png_ptr);
#endif
#if defined(PNG_hIST_SUPPORTED)
png_free_hIST(png_ptr, info_ptr);
#endif
png_free_PLTE(png_ptr, info_ptr);
#if defined(PNG_INFO_IMAGE_SUPPORTED)
png_free_pixels(png_ptr, info_ptr);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
@ -785,7 +854,9 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
void
png_write_destroy(png_structp png_ptr)
{
#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* save jump buffer */
#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
@ -818,8 +889,10 @@ png_write_destroy(png_structp png_ptr)
png_free(png_ptr, png_ptr->inv_filter_costs);
#endif
#ifdef PNG_SETJMP_SUPPORTED
/* reset structure */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
#endif
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
@ -837,7 +910,9 @@ png_write_destroy(png_structp png_ptr)
png_ptr->free_fn = free_fn;
#endif
#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
#endif
}
/* Allow the application to select one or more row filters to use. */
@ -872,14 +947,14 @@ png_set_filter(png_structp png_ptr, int method, int filters)
*/
if (png_ptr->row_buf != NULL)
{
if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL)
if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
if (png_ptr->do_filter & PNG_FILTER_UP && png_ptr->up_row == NULL)
if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
@ -894,7 +969,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
}
}
if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL)
if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
@ -909,7 +984,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
}
}
if (png_ptr->do_filter & PNG_FILTER_PAETH &&
if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
png_ptr->paeth_row == NULL)
{
if (png_ptr->prev_row == NULL)
@ -1127,3 +1202,87 @@ png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
png_ptr->write_user_transform_fn = write_user_transform_fn;
}
#endif
#if defined(PNG_INFO_IMAGE_SUPPORTED)
void png_write_png(png_structp png_ptr, png_infop info_ptr,
int transforms,
voidp params)
{
if(transforms == 0 || params == (voidp)NULL)
/* quiet compiler warnings */ ;
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel from opacity to transparency */
if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
png_set_invert_alpha(png_ptr);
#endif
/* Write the file header information. */
png_write_info(png_ptr, info_ptr);
/* ------ these transformations don't touch the info structure ------- */
#if defined(PNG_WRITE_INVERT_SUPPORTED)
/* invert monochrome pixels */
if (transforms & PNG_TRANSFORM_INVERT_MONO)
png_set_invert_mono(png_ptr);
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
/* Shift the pixels up to a legal bit depth and fill in
* as appropriate to correctly scale the image.
*/
if ((transforms & PNG_TRANSFORM_SHIFT)
&& (info_ptr->valid & PNG_INFO_sBIT))
png_set_shift(png_ptr, &info_ptr->sig_bit);
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED)
/* pack pixels into bytes */
if (transforms & PNG_TRANSFORM_PACKING)
png_set_packing(png_ptr);
#endif
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
/* swap location of alpha bytes from ARGB to RGBA */
if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
png_set_swap_alpha(png_ptr);
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED)
/* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
* RGB (4 channels -> 3 channels). The second parameter is not used.
*/
if (transforms & PNG_TRANSFORM_STRIP_FILLER)
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED)
/* flip BGR pixels to RGB */
if (transforms & PNG_TRANSFORM_BGR)
png_set_bgr(png_ptr);
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
/* swap bytes of 16-bit files to most significant byte first */
if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
png_set_swap(png_ptr);
#endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* swap bits of 1, 2, 4 bit packed pixel formats */
if (transforms & PNG_TRANSFORM_PACKSWAP)
png_set_packswap(png_ptr);
#endif
/* ----------------------- end of transformations ------------------- */
/* write the bits */
if (info_ptr->valid & PNG_INFO_IDAT)
png_write_image(png_ptr, info_ptr->row_pointers);
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end(png_ptr, info_ptr);
}
#endif

8
pngwtran.c
View File

@ -1,11 +1,11 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
@ -140,7 +140,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
{
png_byte value;
value = (png_byte)(*sp & 0x3);
value = (png_byte)(*sp & 0x03);
v |= (value << shift);
if (shift == 0)
{
@ -172,7 +172,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
{
png_byte value;
value = (png_byte)(*sp & 0xf);
value = (png_byte)(*sp & 0x0f);
v |= (value << shift);
if (shift == 0)

135
pngwutil.c
View File

@ -1,11 +1,11 @@
/* pngwutil.c - utilities to write a PNG file
*
* libpng 1.0.5h - December 10, 1999
* libpng 1.0.5q - February 5, 2000
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
@ -133,7 +133,7 @@ png_write_sig(png_structp png_ptr)
(png_size_t)8 - png_ptr->sig_bytes);
}
#if defined(PNG_WRITE_TEXT_SUPPORTED)
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
/*
* This pair of functions encapsulates the operation of (a) compressing a
* text string, and (b) issuing it later as a series of chunk data writes.
@ -334,7 +334,8 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
/* write saved output buffers, if any */
for (i = 0; i < comp->num_output_ptr; i++)
{
png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],png_ptr->zbuf_size);
png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],
png_ptr->zbuf_size);
png_free(png_ptr, comp->output_ptr[i]);
}
if (comp->max_output_ptr != 0)
@ -577,15 +578,15 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
png_byte buf[4];
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/1000000ths */
/* file_gamma is saved in 1/100,000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
}
#endif
void
#ifdef PNG_FIXED_POINT_SUPPORTED
png_write_gAMA_fixed(png_structp png_ptr, png_uint_32 file_gamma)
void
png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_gAMA;
@ -593,7 +594,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_uint_32 file_gamma)
png_byte buf[4];
png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/1000000ths */
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, file_gamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
}
@ -687,8 +688,9 @@ png_write_sPLT(png_structp png_ptr, png_spalette_p spalette)
/* make sure we include the NULL after the name */
png_write_chunk_start(png_ptr, (png_bytep) png_sPLT,
(png_uint_32)(name_len + 1 + palette_size));
(png_uint_32)(name_len + 2 + palette_size));
png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
/* loop through each palette entry, writing appropriately */
for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
@ -784,15 +786,16 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_cHRM;
#endif
png_uint_32 itemp;
png_byte buf[32];
png_uint_32 itemp;
png_debug(1, "in png_write_cHRM\n");
/* each value is saved in 1/1000000ths */
/* each value is saved in 1/100,000ths */
if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
white_x + white_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM white point specified");
printf("white_x=%f, white_y=%f\n",white_x, white_y);
return;
}
itemp = (png_uint_32)(white_x * 100000.0 + 0.5);
@ -838,22 +841,22 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
void
png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,
png_uint_32 white_y, png_uint_32 red_x, png_uint_32 red_y,
png_uint_32 green_x, png_uint_32 green_y, png_uint_32 blue_x,
png_uint_32 blue_y)
png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
png_fixed_point blue_y)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_cHRM;
#endif
png_uint_32 itemp;
png_byte buf[32];
png_debug(1, "in png_write_cHRM\n");
/* each value is saved int 1/1000000ths */
/* each value is saved in 1/100,000ths */
if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM white point specified");
png_warning(png_ptr, "Invalid fixed cHRM white point specified");
printf("white_x=%ld, white_y=%ld\n",white_x, white_y);
return;
}
png_save_uint_32(buf, white_x);
@ -861,7 +864,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,
if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM red point specified");
png_warning(png_ptr, "Invalid cHRM fixed red point specified");
return;
}
png_save_uint_32(buf + 8, red_x);
@ -869,7 +872,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,
if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM green point specified");
png_warning(png_ptr, "Invalid fixed cHRM green point specified");
return;
}
png_save_uint_32(buf + 16, green_x);
@ -877,7 +880,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_uint_32 white_x,
if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM blue point specified");
png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
return;
}
png_save_uint_32(buf + 24, blue_x);
@ -1108,7 +1111,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
{
png_free(png_ptr, *new_key);
*new_key=NULL;
png_chunk_warning(png_ptr, "zero length keyword");
png_chunk_warning(png_ptr, "Zero length keyword");
}
if (key_len > 79)
@ -1143,6 +1146,8 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
if (text == NULL || *text == '\0')
text_len = 0;
else
text_len = png_strlen(text);
/* make sure we include the 0 after the key */
png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
@ -1190,6 +1195,8 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
return;
}
text_len = png_strlen(text);
png_free(png_ptr, new_key);
/* compute the compressed data; do it now for the length */
@ -1215,57 +1222,48 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
/* write an iTXt chunk */
void
png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_charp lang, png_charp translated_key, png_charp text)
png_charp lang, png_charp lang_key, png_charp text)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_iTXt;
#endif
png_size_t lang_len, key_len, translated_key_len, text_len;
png_size_t lang_len, key_len, lang_key_len, text_len;
png_charp new_lang, new_key;
png_byte cbuf[2];
compression_state comp;
png_debug(1, "in png_write_iTXt\n");
translated_key_len = png_strlen(translated_key);
text_len = png_strlen(text);
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in iTXt chunk");
return;
}
if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang,
&new_lang))==0)
{
png_warning(png_ptr, "Empty language field in iTXt chunk");
return;
}
if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
png_warning(png_ptr, "Empty keyword in iTXt chunk");
return;
}
lang_key_len = png_strlen(lang_key);
text_len = png_strlen(text);
if (text == NULL || *text == '\0')
text_len = 0;
/* compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression, &comp);
text_len = png_text_compress(png_ptr, text, text_len, compression-2, &comp);
/* make sure we include the compression flag, the compression byte,
* and the NULs after the key, lang, and translated_key parts */
png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
(png_uint_32)(2 + lang_len+1 + key_len+1 + translated_key_len +
text_len));
* and the NULs after the key, lang, and lang_key parts */
/* set the compression bits */
if (compression == PNG_TEXT_COMPRESSION_NONE)
{
cbuf[0] = 0;
cbuf[1] = 0;
}
else /* compression == PNG_TEXT_COMPRESSION_zTXt */
{
cbuf[0] = 1;
cbuf[1] = 0;
}
png_write_chunk_data(png_ptr, cbuf, 2);
png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
(png_uint_32)(
5 /* comp byte, comp flag, terminators for key, lang and lang_key */
+ key_len
+ lang_len
+ lang_key_len
+ text_len));
/*
* We leave it to the application to meet PNG-1.0 requirements on the
@ -1274,9 +1272,19 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
* The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
*/
png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
/* set the compression flag */
if (compression == PNG_ITXT_COMPRESSION_NONE || \
compression == PNG_TEXT_COMPRESSION_NONE)
cbuf[0] = 0;
else /* compression == PNG_ITXT_COMPRESSION_zTXt */
cbuf[0] = 1;
/* set the compression method */
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, 2);
png_write_chunk_data(png_ptr, (png_bytep)new_lang, lang_len + 1);
png_write_chunk_data(png_ptr, (png_bytep)translated_key,
translated_key_len);
png_write_chunk_data(png_ptr, (png_bytep)lang_key, lang_key_len+1);
png_write_chunk_data(png_ptr, '\0', 1);
png_write_compressed_data_out(png_ptr, &comp);
@ -1375,7 +1383,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
/* write the sCAL chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void
png_write_sCAL(png_structp png_ptr, png_charp unit, double width,double height)
png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
{
#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
@ -1387,19 +1395,20 @@ png_write_sCAL(png_structp png_ptr, png_charp unit, double width,double height)
sprintf(wbuf, "%12.12e", width);
sprintf(hbuf, "%12.12e", height);
total_len = png_strlen(unit)+1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
png_debug1(3, "sCAL total length = %d\n", total_len);
png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)unit, png_strlen(unit)+1);
png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1);
png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf));
png_write_chunk_end(png_ptr);
}
#endif
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
void
png_write_sCAL_s(png_structp png_ptr, png_charp unit, png_charp width,
png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
png_charp height)
{
#ifdef PNG_USE_LOCAL_ARRAYS
@ -1412,17 +1421,19 @@ png_write_sCAL_s(png_structp png_ptr, png_charp unit, png_charp width,
sprintf(wbuf, "%s", width);
sprintf(hbuf, "%s", height);
total_len = png_strlen(unit)+1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
png_debug1(3, "sCAL total length = %d\n", total_len);
png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)unit, png_strlen(unit)+1);
png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1);
png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf));
png_write_chunk_end(png_ptr);
}
#endif
#endif
#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
/* write the pHYs chunk */
@ -1730,7 +1741,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 3);
value = (int)(*sp >> (7 - (int)(i & 7))) & 0x1;
value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
d |= (value << shift);
if (shift == 0)
@ -1764,7 +1775,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 2);
value = (*sp >> ((3 - (int)(i & 3)) << 1)) & 0x3;
value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
d |= (value << shift);
if (shift == 0)
@ -1797,7 +1808,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 1);
value = (*sp >> ((1 - (int)(i & 1)) << 2)) & 0xf;
value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
d |= (value << shift);
if (shift == 0)
@ -1904,7 +1915,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
/* We don't need to test the 'no filter' case if this is the only filter
* that has been chosen, as it doesn't actually do anything to the data.
*/
if (filter_to_do & PNG_FILTER_NONE &&
if ((filter_to_do & PNG_FILTER_NONE) &&
filter_to_do != PNG_FILTER_NONE)
{
png_bytep rp;

0
scripts/pngdll.mak → scripts/makefile.bd32
View File

2
scripts/makefile.beos
View File

@ -31,7 +31,7 @@ RANLIB=ranlib
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.5h
PNGMIN = 1.0.5q
PNGVER = $(PNGMAJ).$(PNGMIN)
# where make install puts libpng.a, libpng.so*, and png.h

2
scripts/makefile.dec
View File

@ -14,7 +14,7 @@ ZLIBINC=../zlib
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.5h
PNGMIN = 1.0.5q
PNGVER = $(PNGMAJ).$(PNGMIN)
CC=cc

112
scripts/makefile.gcmmx Normal file
View File

@ -0,0 +1,112 @@
# makefile for libpng on Linux ELF with gcc using MMX assembler code
# Copyright (C) 1996, 1997 Andreas Dilger
# Copyright (C) 1998, 1999, 2000 Greg Roelofs
# For conditions of distribution and use, see copyright notice in png.h
CC=gcc
# where "make install" puts libpng.a, libpng.so*, png.h and pngconf.h
prefix=/usr/local
# Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include
ZLIBLIB=../zlib
ZLIBINC=../zlib
ALIGN=
# for i386:
#ALIGN=-malign-loops=2 -malign-functions=2
WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
-Wmissing-declarations -Wtraditional -Wcast-align \
-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
# for pgcc version 2.95.1, -O3 is buggy; don't use it.
CFLAGS=-DPNG_USE_PNGGCCRD -I$(ZLIBINC) -Wall -O3 $(ALIGN) \
-funroll-loops -fomit-frame-pointer # $(WARNMORE) -g -DPNG_DEBUG=5
LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
RANLIB=ranlib
#RANLIB=echo
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.5q
PNGVER = $(PNGMAJ).$(PNGMIN)
INCPATH=$(prefix)/include
LIBPATH=$(prefix)/lib
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pnggccrd.o
OBJSDLL = $(OBJS:.o=.pic.o)
.SUFFIXES: .c .o .pic.o
.c.pic.o:
$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c
all: libpng.a libpng.so pngtest
libpng.a: $(OBJS)
ar rc $@ $(OBJS)
$(RANLIB) $@
libpng.so: libpng.so.$(PNGMAJ)
ln -sf libpng.so.$(PNGMAJ) libpng.so
libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
libpng.so.$(PNGVER): $(OBJSDLL)
$(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
$(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc
pngtest: pngtest.o libpng.so
$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
test: pngtest
./pngtest
install: libpng.a libpng.so.$(PNGVER)
-@mkdir $(INCPATH) $(LIBPATH)
cp png.h pngconf.h $(INCPATH)
chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
ln -sf libpng.so.$(PNGMAJ) libpng.so)
clean:
/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
writelock:
chmod a-w *.[ch35] $(DOCS) scripts/*
# DO NOT DELETE THIS LINE -- make depend depends on it.
png.o png.pic.o: png.h pngconf.h
pngerror.o pngerror.pic.o: png.h pngconf.h
pngrio.o pngrio.pic.o: png.h pngconf.h
pngwio.o pngwio.pic.o: png.h pngconf.h
pngmem.o pngmem.pic.o: png.h pngconf.h
pngset.o pngset.pic.o: png.h pngconf.h
pngget.o pngget.pic.o: png.h pngconf.h
pngread.o pngread.pic.o: png.h pngconf.h
pngrtran.o pngrtran.pic.o: png.h pngconf.h
pngrutil.o pngrutil.pic.o: png.h pngconf.h
pngtrans.o pngtrans.pic.o: png.h pngconf.h
pngwrite.o pngwrite.pic.o: png.h pngconf.h
pngwtran.o pngwtran.pic.o: png.h pngconf.h
pngwutil.o pngwutil.pic.o: png.h pngconf.h
pngpread.o pngpread.pic.o: png.h pngconf.h
pnggccrd.o pnggccrd.pic.o: png.h pngconf.h
pngtest.o: png.h pngconf.h

2
scripts/makefile.linux
View File

@ -34,7 +34,7 @@ RANLIB=ranlib
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.5h
PNGMIN = 1.0.5q
PNGVER = $(PNGMAJ).$(PNGMIN)
INCPATH=$(prefix)/include

2
scripts/makefile.sco
View File

@ -25,7 +25,7 @@ RANLIB=echo
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.5h
PNGMIN = 1.0.5q
PNGVER = $(PNGMAJ).$(PNGMIN)
INCPATH=$(prefix)/include

25
scripts/makefile.solaris
View File

@ -6,17 +6,6 @@
CC=gcc
case "`type ld`" in *ucb*) echo "
# WARNING:
# The commands "CC" and "LD" must NOT refer to /usr/ucb/cc and
# /usr/ucb/ld. If they do, you need to adjust your PATH environment
# variable to put /usr/ccs/bin ahead of /usr/ucb. The environment
# variable LD_LIBRARY_PATH should not be set at all. If it is,
# things are likely to break because of the libucb dependency that
# is created.
" ;;
esac
# Where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
@ -42,7 +31,7 @@ RANLIB=echo
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.5h
PNGMIN = 1.0.5q
PNGVER = $(PNGMAJ).$(PNGMIN)
INCPATH=$(prefix)/include
@ -72,6 +61,18 @@ libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
ln -f -s libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
libpng.so.$(PNGVER): $(OBJSDLL)
@case "`type ld`" in *ucb*) \
echo; \
echo '## WARNING:'; \
echo '## The commands "CC" and "LD" must NOT refer to /usr/ucb/cc'; \
echo '## and /usr/ucb/ld. If they do, you need to adjust your PATH'; \
echo '## environment variable to put /usr/ccs/bin ahead of /usr/ucb.'; \
echo '## The environment variable LD_LIBRARY_PATH should not be set'; \
echo '## at all. If it is, things are likely to break because of'; \
echo '## the libucb dependency that is created.'; \
echo; \
;; \
esac
$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \
-o libpng.so.$(PNGVER) $(OBJSDLL) -lz

1
scripts/makefile.vcawin32
View File

@ -81,6 +81,7 @@ pngwutil$(O): png.h pngconf.h
$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
echo something to del > libpng.lib
del libpng.lib
lib /OUT:libpng.lib $(OBJS1) $(OBJS2) $(OBJS3)

1
scripts/makefile.vcwin32
View File

@ -74,6 +74,7 @@ pngwutil$(O): png.h pngconf.h
$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
echo something to del > libpng.lib
del libpng.lib
lib /OUT:libpng.lib $(OBJS1) $(OBJS2) $(OBJS3)

25
scripts/pngdef.pas
View File

@ -3,7 +3,7 @@ unit pngdef;
interface
const
PNG_LIBPNG_VER_STRING = '1.0.5h';
PNG_LIBPNG_VER_STRING = '1.0.5n';
PNG_LIBPNG_VER = 10006;
type
@ -56,6 +56,9 @@ type
png_write_status_ptr = procedure(png_ptr: Pointer;
row_number: png_uint_32; pass: int);
stdcall;
png_user_chunk_ptr = procedure(png_ptr: Pointer;
data: png_unknown_chunkp);
stdcall;
png_user_transform_ptr = procedure(png_ptr: Pointer;
row_info: Pointer; data: png_bytep);
stdcall;
@ -380,6 +383,9 @@ function png_get_text(png_ptr: png_structp; info_ptr: png_infop;
var text_ptr: png_textp; var num_text: int):
png_uint_32;
stdcall;
function png_get_user_chunk_ptr(png_ptr: png_structp):
png_voidp;
stdcall;
function png_get_valid(png_ptr: png_structp; info_ptr: png_infop;
flag: png_uint_32): png_uint_32;
stdcall;
@ -525,6 +531,9 @@ procedure png_set_read_fn(png_ptr: png_structp;
procedure png_set_read_status_fn(png_ptr: png_structp;
read_row_fn: png_read_status_ptr);
stdcall;
procedure png_set_read_user_chunk_fn(png_ptr: png_structp;
read_user_chunk_fn: png_user_chunk_ptr);
stdcall;
procedure png_set_read_user_transform_fn(png_ptr: png_structp;
read_user_transform_fn: png_user_transform_ptr);
stdcall;
@ -613,14 +622,22 @@ procedure png_get_spalettes(png_ptr: png_structp;
stdcall;
procedure png_free_pCAL(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_free_sCAL(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_set_iCCP(png_ptr: png_structp; info_ptr: png_infop;
name: png_charp; compression_type: int; profile: png_charp;
proflen: int);
stdcall;
procedure png_free_hIST(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_free_iCCP(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_free_PLTE(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_free_text(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_free_tRNS(png_ptr: png_structp; info_ptr: png_infop);
stdcall;
procedure png_set_spalettes(png_ptr: png_structp; info_ptr: png_infop;
entries: png_spalette_p; nentries: int);
stdcall;
@ -673,6 +690,7 @@ function png_get_signature; external pngDLL;
function png_get_tIME; external pngDLL;
function png_get_tRNS; external pngDLL;
function png_get_text; external pngDLL;
function png_get_user_chunk_ptr; external pngDLL;
function png_get_valid; external pngDLL;
function png_get_x_offset_microns; external pngDLL;
function png_get_x_offset_pixels; external pngDLL;
@ -735,6 +753,7 @@ procedure png_set_swap_alpha; external pngDLL;
procedure png_set_tIME; external pngDLL;
procedure png_set_tRNS; external pngDLL;
procedure png_set_text; external pngDLL;
procedure png_set_user_chunk_fn; external pngDLL;
procedure png_set_write_fn; external pngDLL;
procedure png_set_write_status_fn; external pngDLL;
procedure png_set_write_user_transform_fn; external pngDLL;
@ -755,8 +774,12 @@ procedure png_get_iCCP; external pngDLL;
procedure png_get_spalettes; external pngDLL;
procedure png_free_pCAL; external pngDLL;
procedure png_set_iCCP; external pngDLL;
procedure png_free_hIST; external pngDLL;
procedure png_free_iCCP; external pngDLL;
procedure png_free_PLTE; external pngDLL;
procedure png_free_sCAL; external pngDLL;
procedure png_free_text; external pngDLL;
procedure png_free_tRNS; external pngDLL;
procedure png_set_spalettes; external pngDLL;
procedure png_free_sPLT; external pngDLL;

49
scripts/pngos2.def
View File

@ -47,6 +47,7 @@ EXPORTS
png_set_dither
png_set_gamma
png_set_flush
png_set_user_chunk_fn
png_write_flush
png_start_read_image
png_read_update_info
@ -79,6 +80,7 @@ EXPORTS
png_get_header_ver
png_get_header_version
png_get_libpng_ver
png_get_user_chunk_ptr
; png_get_mem_fn
; png_set_mem_fn
png_set_write_fn
@ -177,20 +179,24 @@ EXPORTS
png_write_PLTE
png_write_IDAT
png_write_IEND
png_write_gAMA
png_write_sBIT
png_write_cHRM
png_write_sRGB
png_write_tRNS
png_write_bKGD
png_write_cHRM
png_write_gAMA
png_write_hIST
png_check_keyword
png_write_tEXt
png_write_zTXt
png_write_iCCP
png_write_iTXt
png_write_oFFs
png_write_pCAL
png_write_pHYs
png_write_sBIT
png_write_sCAL
png_write_sPLT
png_write_sRGB
png_check_keyword
png_write_tEXt
png_write_tIME
png_write_tRNS
png_write_zTXt
png_write_finish_row
png_write_start_row
png_build_gamma_table
@ -229,18 +235,22 @@ EXPORTS
png_handle_IHDR
png_handle_PLTE
png_handle_IEND
png_handle_gAMA
png_handle_sBIT
png_handle_cHRM
png_handle_sRGB
png_handle_tRNS
png_handle_bKGD
png_handle_cHRM
png_handle_gAMA
png_handle_hIST
png_handle_iCCP
png_handle_iTXt
png_handle_oFFs
png_handle_pCAL
png_handle_pHYs
png_handle_tIME
png_handle_sBIT
png_handle_sCAL
png_handle_sPLT
png_handle_sRGB
png_handle_tEXt
png_handle_tIME
png_handle_tRNS
png_handle_zTXt
png_handle_unknown
png_check_chunk_name
@ -282,13 +292,16 @@ EXPORTS
png_get_iCCP
png_get_sCAL
png_get_spalettes
png_free_pCAL
png_set_iCCP
png_free_iCCP
png_free_text
png_free_sCAL
png_set_spalettes
png_free_hIST
png_free_iCCP
png_free_pCAL
png_free_PLTE
png_free_sCAL
png_free_sPLT
png_free_text
png_free_tRNS
png_IHDR
png_IDAT