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Glenn Randers-Pehrson 1998-12-29 11:47:59 -06:00
parent 345bc27e70
commit 5c6aeb25c1
45 changed files with 1160 additions and 735 deletions
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89
ANNOUNCE
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@ -1,67 +1,38 @@
Libpng 1.0.2 - June 14, 1998 Libpng 1.0.2a - December 29, 1998
This is a public release of libpng, intended for use in production codes. 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.
Changes since the previous public release (1.0.1): Changes since the last public release:
Optimized Paeth calculations by replacing abs() function calls with intrinsics libpng-1.0.2a:
plus other loop optimizations. Improves avg decoding speed by about 20%.
Commented out i386istic "align" compiler flags in makefile.lnx. Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
Reduced the default warning level in some makefiles, to make them consistent. Fixed a bug in png_do_filler() that made it fail to write filler bytes in
Removed references to IJG and JPEG in the ansi2knr.c copyright statement. the left-most pixel of each row (Kevin Bracey).
Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation. Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
Added grayscale and 16-bit capability to png_do_read_filler(). in pngtest.c (Duncan Simpson).
Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
too large when writing an image with bit_depth < 8 (Bob Dellaca). Fixed a problem in png_read_push_finish_row(), which would not skip some
Corrected some bugs in the experimental weighted filtering heuristics. passes that it should skip, for images that are less than 3 pixels high.
Moved a misplaced pngrutil code block that truncates tRNS if it has more Interchanged the order of calls to png_do_swap() and png_do_shift()
than num_palette entries -- test was done before num_palette was defined. in pngwtran.c (John Cromer).
Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins). Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen). Changed "bad adaptive filter type" from error to warning in pngrutil.c .
Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg). Fixed a documentation error about default filtering with 8-bit indexed-color.
Relocated the png_composite macros from pngrtran.c to png.h (Greg). Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
Added makefile.sco (contributed by Mike Hopkirk). (L. Peter Deutsch).
Fixed a bug in pngrtran.c that would set channels=5 under some circumstances. Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
Added warnings when people try to use transforms they've defined out. Added png_get_copyright() and png_get_header_version() functions.
Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran. Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg) Added information about debugging in libpng.txt and libpng.3 .
Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images. Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED Removed lines after Dynamic Dependencies" in makefile.aco .
out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h Revised makefile.dec to make a shared library (Jeremie Petit).
Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED, Removed trailing blanks from all files.
for consistency, in pngconf.h
Added individual "ifndef PNG_NO_CAPABILITY" for the capabilities in pngconf.h
to make it easier to remove unwanted capabilities via the compile line
Made some corrections to grammar (which, it's) in documentation (Greg).
Corrected example.c, use of row_pointers in png_write_image().
Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
More corrections to example.c, use of row_pointers in png_write_image()
and png_read_rows().
Added pngdll.mak and pngdef.pas to scripts directory, contributed by
Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
Changed several loops from count-down to count-up, for consistency.
Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
added warnings when people try to set png_read_fn and png_write_fn in
the same structure.
Added a test such that png_do_gamma will be done when num_trans==0
for truecolor images that have defined a background. This corrects an
error that was introduced in libpng-0.90 that can cause gamma processing
to be skipped.
Added tests in png.h to include "trans" and "trans_values" in structures
when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
Added capability for user-provided malloc_fn() and free_fn() functions,
and revised pngtest.c to demonstrate their use, replacing the
PNGTEST_DEBUG_MEM feature.
Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
Fixed two bugs in makefile.bor
Send comments/corrections/commendations to Send comments/corrections/commendations to
png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
Glenn Randers-Pehrson Glenn R-P
libpng maintainer
PNG Development Group

29
CHANGES
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@ -334,7 +334,7 @@ version 1.0.1d [May 24, 1998]
Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5 Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.) Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
Changed several loops from count-down to count-up, for consistency. Changed several loops from count-down to count-up, for consistency.
version 1.0.2 [June 14, 1998] version 1.0.1e [June 6, 1998]
Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
added warnings when people try to set png_read_fn and png_write_fn in added warnings when people try to set png_read_fn and png_write_fn in
the same structure. the same structure.
@ -350,4 +350,29 @@ version 1.0.2 [June 14, 1998]
and revised pngtest.c to demonstrate their use, replacing the and revised pngtest.c to demonstrate their use, replacing the
PNGTEST_DEBUG_MEM feature. PNGTEST_DEBUG_MEM feature.
Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner). Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
Fixed two bugs in makefile.bor version 1.0.2 [June 14, 1998]
Fixed two bugs in makefile.bor .
version 1.0.2a [December 29, 1998]
Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
Fixed a bug in png_do_filler() that made it fail to write filler bytes in
the left-most pixel of each row (Kevin Bracey).
Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
in pngtest.c (Duncan Simpson).
Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
Fixed a problem in png_read_push_finish_row(), which would not skip some
passes that it should skip, for images that are less than 3 pixels high.
Interchanged the order of calls to png_do_swap() and png_do_shift()
in pngwtran.c (John Cromer).
Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
Changed "bad adaptive filter type" from error to warning in pngrutil.c .
Fixed a documentation error about default filtering with 8-bit indexed-color.
Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
(L. Peter Deutsch).
Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
Added png_get_copyright() and png_get_header_version() functions.
Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
Added information about debugging in libpng.txt and libpng.3 .
Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
Removed lines after Dynamic Dependencies" in makefile.aco .
Revised makefile.dec to make a shared library (Jeremie Petit).
Removed trailing blanks from all files.

6
INSTALL
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@ -1,5 +1,5 @@
Installing libpng version 1.0.2 - June 14, 1998 Installing libpng version 1.0.2a - December 29, 1998
Before installing libpng, you must first install zlib. zlib Before installing libpng, you must first install zlib. zlib
can usually be found wherever you got libpng. zlib can be can usually be found wherever you got libpng. zlib can be
@ -10,8 +10,8 @@ zlib.h and zconf.h include files that correspond to the
version of zlib that's installed. version of zlib that's installed.
You can rename the directories that you downloaded (they You can rename the directories that you downloaded (they
might be called "libpng-1.0.2" or "lpng102" and "zlib-1.1.2" might be called "libpng-1.0.2a" or "lpng103" and "zlib-1.1.3"
or "zlib112") so that you have directories called "zlib" and "libpng". or "zlib113") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this: Your directory structure should look like this:

71
KNOWNBUG
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@ -14,6 +14,73 @@ Known bugs and suggested enhancements in libpng-1.0.2
Question whether i-- or --i is better. Question whether i-- or --i is better.
STATUS: Under investigation, postponed until after STATUS: Under investigation, postponed until after
libpng-1.0.2. About 160 loops turned around libpng-1.0.2. About 160 loops will be turned around
in libpng-1.0.2a, for testing. in libpng-1.0.Nn, for testing.
2. June 15, 1998 -- BUG -- Evan Light
Under some conditions, 16-bit grayscale images aren't properly
expanded to rgb, because png_read_start_row() returns too small a
value of max_pixel_depth when png_set_filler() has also been called.
STATUS: Fixed in libpng-1.0.2a
3. June 16, 1998 -- BUG -- Matt McConnell
When reading interlaced images with a progressive reader, in some
cases (interlaced images less than 3 pixels high) some passes are
not skipped that should be.
STATUS: Fixed in libpng-1.0.2a
4. July 3, 1998 -- ENHANCEMENT -- Glenn R-P
Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
STATUS: Done in libpng-1.0.2a, awaiting comment on resulting test
images.
5. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
libpng-1.0.2 and earlier transform colors to gamma=1.0 space for
merging with background, and then back to the image's gamma. The
bit_depth of the intermediate (gamma=1.0) representation is probably
not sufficient. In the typical gamma=1/2.2 situation, the linear
pixels need about 4 more bits than the gamma-encoded ones, to avoid
loss of precision. A similar situation exists with the rgb_to_gray
operation.
STATUS: under development.
6. August 20, 1998 -- BUG -- Kevin Bracey
When using the filler transformation, the filler isn't written
into the leftmost pixel of each row.
Also, the filler operation isn't being done right when writing
files. Some code that was removed from png_set_filler() in
libpng 1.0.1a shouldn't have been removed.
STATUS: Fixed in libpng-1.0.2a
7. August 23, 1998 -- BUG -- Duncan Simpson
"static pngcharp tIME_string" should be changed to
"static char tIME_string[30]" in pngtest.c
STATUS: Fixed in libpng-1.0.2a
8. August 24, 1998 -- BUG -- John Cromer
Order of byte-swap and shift operations seems to be incorrect in
png_do_write_transformations()
STATUS: Under investigation.
9. September 11, 1998 -- ENHANCEMENT -- L. Peter Deutsch
The PNG_NO_STDIO macro should be split into PNG_NO_STDIO
and PNG_NO_CONSOLE_STDIO.
STATUS: Done in libpng-1.0.2a

2
README
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@ -1,4 +1,4 @@
README for libpng 1.0.2 - June 14, 1998 (shared library 2.1) README for libpng 1.0.2a - December 29, 1998 (shared library 2.1)
See the note about version numbers near the top of png.h See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng. See INSTALL for instructions on how to install libpng.

45
TODO
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@ -1,23 +1,24 @@
TODO - list of things to do for libpng TODO - list of things to do for libpng:
fix problem with C++ and EXTERN "C" Final bug fixes.
add "grayscale->palette" transformation and "palette->grayscale" detection Fix problem with C++ and EXTERN "C".
color to gray transformation Better C++ wrapper/full C++ implementation?
improved dithering Keep up with public chunks.
multi-lingual error and warning message support sPLT chunk handling.
sPLT chunk handling cHRM transformation.
cHRM transformation Support for application-defined chunk handlers.
complete sRGB transformation (presently it simply uses gamma=0.45) Improve setjmp/longjmp usage or remove it in favor of returning error codes.
man pages for function calls High-level API for reading images.
high-level API for reading images Add "grayscale->palette" transformation and "palette->grayscale" detection.
final bug fixes Color to gray transformation.
better documentation Improved dithering.
better filter selection Multi-lingual error and warning message support.
(counting huffman bits/precompression? filter inertia? filter costs?) Complete sRGB transformation (presently it simply uses gamma=0.45455).
optional palette creation Man pages for function calls.
histogram creation Better documentation.
support for application-defined chunk handlers Better filter selection
keep up with public chunks (counting huffman bits/precompression? filter inertia? filter costs?).
better C++ wrapper/full C++ implementation? Optional palette (sPLT) creation.
text conversion between different code pages (Latin-1 -> Mac and DOS) Histogram creation.
improve API by hiding the info_ptr Text conversion between different code pages (Latin-1 -> Mac and DOS).
Improve API by hiding the info_ptr.

10
example.c
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@ -221,10 +221,13 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
if (png_get_sRGB(png_ptr, info_ptr, &intent)) if (png_get_sRGB(png_ptr, info_ptr, &intent))
png_set_sRGB(png_ptr, intent, 0); png_set_sRGB(png_ptr, intent, 0);
else else
{
double image_gamma;
if (png_get_gAMA(png_ptr, info_ptr, &image_gamma)) if (png_get_gAMA(png_ptr, info_ptr, &image_gamma))
png_set_gamma(png_ptr, screen_gamma, image_gamma); png_set_gamma(png_ptr, screen_gamma, image_gamma);
else else
png_set_gamma(png_ptr, screen_gamma, 0.50); png_set_gamma(png_ptr, screen_gamma, 0.45455);
}
/* Dither RGB files down to 8 bit palette or reduce palettes /* Dither RGB files down to 8 bit palette or reduce palettes
* to the number of colors available on your screen. * to the number of colors available on your screen.
@ -384,8 +387,11 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
return ERROR; return ERROR;
} }
/* this one's new. You will need to provide all three /* This one's new. You will need to provide all three
* function callbacks, even if you aren't using them all. * function callbacks, even if you aren't using them all.
* If you aren't using all functions, you can specify NULL
* parameters. Even when all three functions are NULL,
* you need to call png_set_progressive_read_fn().
* These functions shouldn't be dependent on global or * These functions shouldn't be dependent on global or
* static variables if you are decoding several images * static variables if you are decoding several images
* simultaneously. You should store stream specific data * simultaneously. You should store stream specific data

169
libpng.3
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@ -1,6 +1,6 @@
.TH LIBPNG 3 "June 14, 1998" .TH LIBPNG 3 "December 29, 1998"
.SH NAME .SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.2 - June 14, 1998 libpng \- Portable Network Graphics (PNG) Reference Library 1.0.2a - December 29, 1998
.SH SYNOPSIS .SH SYNOPSIS
#include <png.h> #include <png.h>
@ -27,7 +27,7 @@ png_structp png_create_read_struct (png_const_charp
user_png_ver, voidp error_ptr, png_error_ptr error_fn, user_png_ver, voidp error_ptr, png_error_ptr error_fn,
png_error_ptr warn_fn); png_error_ptr warn_fn);
png_create_read_struct_2(png_const_charp user_png_ver, png_structp png_create_read_struct_2(png_const_charp user_png_ver,
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr
warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
png_free_ptr free_fn) png_free_ptr free_fn)
@ -41,8 +41,11 @@ user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
png_error_ptr warn_fn, png_voidp mem_ptr, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn) png_malloc_ptr malloc_fn, png_free_ptr free_fn)
png_voidp png_debug_malloc (png_structp png_ptr, png_uint_32 int png_debug(int level, png_const_charp message)
size);
int png_debug1(int level, png_const_charp message, p1)
int png_debug2(int level, png_const_charp message, p1, p2)
void png_destroy_info_struct (png_structp png_ptr, png_infopp void png_destroy_info_struct (png_structp png_ptr, png_infopp
info_ptr_ptr); info_ptr_ptr);
@ -79,6 +82,8 @@ info_ptr);
png_byte png_get_compression_type (png_structp png_ptr, png_byte png_get_compression_type (png_structp png_ptr,
png_infop info_ptr); png_infop info_ptr);
png_byte png_get_copyright (png_structp png_ptr);
png_voidp png_get_error_ptr (png_structp png_ptr); png_voidp png_get_error_ptr (png_structp png_ptr);
png_byte png_get_filter_type (png_structp png_ptr, png_infop png_byte png_get_filter_type (png_structp png_ptr, png_infop
@ -87,6 +92,8 @@ info_ptr);
png_uint_32 png_get_gAMA (png_structp png_ptr, png_infop png_uint_32 png_get_gAMA (png_structp png_ptr, png_infop
info_ptr, double *file_gamma); info_ptr, double *file_gamma);
png_byte png_get_header_version (png_structp png_ptr);
png_uint_32 png_get_hIST (png_structp png_ptr, png_infop png_uint_32 png_get_hIST (png_structp png_ptr, png_infop
info_ptr, png_uint_16p *hist); info_ptr, png_uint_16p *hist);
@ -131,6 +138,8 @@ png_voidp png_get_progressive_ptr (png_structp png_ptr);
png_uint_32 png_get_PLTE (png_structp png_ptr, png_infop png_uint_32 png_get_PLTE (png_structp png_ptr, png_infop
info_ptr, png_colorp *palette, int *num_palette); info_ptr, png_colorp *palette, int *num_palette);
png_byte png_get_rgb_to_gray_status (png_structp png_ptr)
png_uint_32 png_get_rowbytes (png_structp png_ptr, png_infop png_uint_32 png_get_rowbytes (png_structp png_ptr, png_infop
info_ptr); info_ptr);
@ -325,7 +334,7 @@ read_row_fn);
void png_set_read_user_transform_fn (png_structp png_ptr, void png_set_read_user_transform_fn (png_structp png_ptr,
png_user_transform_ptr read_user_transform_fn); png_user_transform_ptr read_user_transform_fn);
void png_set_rgb_to_gray (png_structp png_ptr); void png_set_rgb_to_gray (png_structp png_ptr, int error_action);
void png_set_sBIT (png_structp png_ptr, png_infop info_ptr, void png_set_sBIT (png_structp png_ptr, png_infop info_ptr,
png_color_8p sig_bit); png_color_8p sig_bit);
@ -414,7 +423,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT .SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng libpng.txt - A description on how to use and modify libpng
libpng version 1.0.2 - June 14, 1998 libpng version 1.0.2a - December 29, 1998
Updated and distributed by Glenn Randers-Pehrson Updated and distributed by Glenn Randers-Pehrson
<randeg@alumni.rpi.edu> <randeg@alumni.rpi.edu>
Copyright (c) 1998, Glenn Randers-Pehrson Copyright (c) 1998, Glenn Randers-Pehrson
@ -454,7 +463,8 @@ as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
additional chunks are described in the special-purpose public chunks additional chunks are described in the special-purpose public chunks
documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information
about PNG can be found at the PNG home page, <http://www.cdrom.com/pub/png/>. about PNG, and the latest version of libpng, can be found at the PNG home
page, <http://www.cdrom.com/pub/png/>.
Most users will not have to modify the library significantly; advanced Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as users may want to modify it more. All attempts were made to make it as
@ -471,6 +481,8 @@ work to be done (see the TODO file), libpng should cover the
majority of the needs of its users. majority of the needs of its users.
Libpng uses zlib for its compression and decompression of PNG files. Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng. useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details. See the documentation delivered with zlib for more details.
@ -593,8 +605,8 @@ are only necessary if you are not using the libpng supplied error
handling and memory alloc/free functions. handling and memory alloc/free functions.
When libpng encounters an error, it expects to longjmp back When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass the to your routine. Therefore, you will need to call setjmp and pass
jmpbuf field of your png_struct. If you read the file from different your png_ptr->jmpbuf. If you read the file from different
routines, you will need to update the jmpbuf field every time you enter routines, you will need to update the jmpbuf field every time you enter
a new routine that will call a png_ function. a new routine that will call a png_ function.
@ -1002,6 +1014,63 @@ RGB. This code will do that conversion:
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr); png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
with alpha. This is intended for conversion of images that really are
gray (red == green == blue), so the function simply strips out the red
and blue channels, leaving the green channel in the gray position.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_rgb_to_gray(png_ptr, error_action,
float red_weight, float green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
image has any pixel where
red != green or red != blue
error_action = 3: issue an error and abort the
conversion if the original
image has any pixel where
red != green or red != blue
red_weight: weight of red component
(NULL -> default 54/256)
green_weight: weight of green component
(NULL -> default 183/256)
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
the image rows, with the png_get_rgb_to_gray_status(png_ptr) function.
It will return a png_byte that is zero if the image was gray or
1 if there were any non-gray pixels. bKGD and sBIT data
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
With 0.0<=red_weight+green_weight<=1.0,
the normalized graylevel is computed:
int rw = red_weight * 256;
int gw = green_weight * 256;
int bw = 256 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/256;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
Libpng approximates this with
Y = 0.211 * R + 0.715 * G + 0.074 * B
which can be expressed with integers as
Y = (54 * R + 183 * G + 19 * B)/256
The calculation is done in a linear colorspace, if the image gamma
is known.
If you have a grayscale and you are using png_set_expand() to change to If you have a grayscale and you are using png_set_expand() to change to
a higher bit-depth, you must either supply the background color as a gray a higher bit-depth, you must either supply the background color as a gray
value at the original file bit-depth (need_expand = 1) or else supply the value at the original file bit-depth (need_expand = 1) or else supply the
@ -1061,7 +1130,7 @@ compensation other than the display_gamma is needed (viewing_gamma=1.0).
The png_set_gamma() function handles gamma transformations of the data. The png_set_gamma() function handles gamma transformations of the data.
Pass both the file gamma and the current screen_gamma. If the file does Pass both the file gamma and the current screen_gamma. If the file does
not have a gamma value, you can pass one anyway if you have an idea what not have a gamma value, you can pass one anyway if you have an idea what
it is (usually 0.50 is a good guess for GIF images on PCs). Note it is (usually 0.45455 is a good guess for GIF images on PCs). Note
that file gammas are inverted from screen gammas. See the discussions that file gammas are inverted from screen gammas. See the discussions
on gamma in the PNG specification for an excellent description of what on gamma in the PNG specification for an excellent description of what
gamma is, and why all applications should support it. It is strongly gamma is, and why all applications should support it. It is strongly
@ -1070,7 +1139,7 @@ recommended that PNG viewers support gamma correction.
if (png_get_gAMA(png_ptr, info_ptr, &gamma)) if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, screen_gamma, gamma); png_set_gamma(png_ptr, screen_gamma, gamma);
else else
png_set_gamma(png_ptr, screen_gamma, 0.50); png_set_gamma(png_ptr, screen_gamma, 0.45455);
If you need to reduce an RGB file to a paletted file, or if a paletted If you need to reduce an RGB file to a paletted file, or if a paletted
file has more entries then will fit on your screen, png_set_dither() file has more entries then will fit on your screen, png_set_dither()
@ -1321,7 +1390,9 @@ png_infop info_ptr;
to be called when the header info is valid, to be called when the header info is valid,
when each row is completed, and when the image when each row is completed, and when the image
is finished. If you aren't using all functions, is finished. If you aren't using all functions,
you can specify a NULL parameter. You can use you can specify NULL parameters. Even when all
three functions are NULL, you need to call
png_set_progressive_read_fn(). You can use
any struct as the user_ptr (cast to a void pointer any struct as the user_ptr (cast to a void pointer
for the function call), and retrieve the pointer for the function call), and retrieve the pointer
from inside the callbacks using the function from inside the callbacks using the function
@ -1367,7 +1438,7 @@ png_infop info_ptr;
} }
/* This function is called (as set by /* This function is called (as set by
png_set_progressive_fn() above) when enough data png_set_progressive_read_fn() above) when enough data
has been supplied so all of the header has been has been supplied so all of the header has been
read. read.
*/ */
@ -1495,7 +1566,7 @@ png_create_write_struct_2() instead of png_create_read_struct():
After you have these structures, you will need to set up the After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call longjmp() back to your routine. Therefore, you will need to call
setjmp and pass the jmpbuf field of your png_struct. If you setjmp() and pass the png_ptr->jmpbuf. If you
write the file from different routines, you will need to update write the file from different routines, you will need to update
the jmpbuf field every time you enter a new routine that will the jmpbuf field every time you enter a new routine that will
call a png_ function. See your documentation of setjmp/longjmp call a png_ function. See your documentation of setjmp/longjmp
@ -1509,6 +1580,8 @@ section below for more information on the libpng error handling.
fclose(fp); fclose(fp);
return; return;
} }
...
return;
Now you need to set up the output code. The default for libpng is to 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 use the C function fwrite(). If you use this, you will need to pass a
@ -1739,7 +1812,7 @@ png_text structure holds a keyword-text value, and a compression type.
The compression types have the same valid numbers as the compression The compression types have the same valid numbers as the compression
types of the image data. Currently, the only valid number is zero. types of the image data. Currently, the only valid number is zero.
However, you can store text either compressed or uncompressed, unlike However, you can store text either compressed or uncompressed, unlike
images which always have to be compressed. So if you don't want the images, which always have to be compressed. So if you don't want the
text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE. text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE.
Until text gets around 1000 bytes, it is not worth compressing it. Until text gets around 1000 bytes, it is not worth compressing it.
After the text has been written out to the file, the compression type After the text has been written out to the file, the compression type
@ -1799,7 +1872,7 @@ depending on whether you mean the PNG file, the time the image was
created in a non-PNG format, a still photo from which the image was created in a non-PNG format, a still photo from which the image was
scanned, or possibly the subject matter itself. In order to facilitate scanned, or possibly the subject matter itself. In order to facilitate
machine-readable dates, it is recommended that the "Creation Time" machine-readable dates, it is recommended that the "Creation Time"
tEXt chunk use RFC 1123 format dates (e.g. 22 May 1997 18:07:10 GMT"), tEXt chunk use RFC 1123 format dates (e.g. "22 May 1997 18:07:10 GMT"),
although this isn't a requirement. Unlike the tIME chunk, the although this isn't a requirement. Unlike the tIME chunk, the
"Creation Time" tEXt chunk is not expected to be automatically changed "Creation Time" tEXt chunk is not expected to be automatically changed
by the software. To facilitate the use of RFC 1123 dates, a function by the software. To facilitate the use of RFC 1123 dates, a function
@ -2017,7 +2090,7 @@ The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works. adding new transformations, and generally changing how libpng works.
All of the memory allocation, input/output, and error handling in libpng All of the memory allocation, input/output, and error handling in libpng
goes through callbacks which are user settable. The default routines are goes through callbacks that are user settable. The default routines are
in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change
these functions, call the appropriate png_set_???_fn() function. these functions, call the appropriate png_set_???_fn() function.
@ -2126,7 +2199,7 @@ won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
Configuring for DOS: Configuring for DOS:
For DOS users which only have access to the lower 640K, you will 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() 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. call. See zlib.h or zconf.h in the zlib library for more information.
@ -2138,7 +2211,7 @@ 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 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 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 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 a note that the row's of data are defined as png_bytepp, which is an
unsigned char far * far *. unsigned char far * far *.
Configuring for gui/windowing platforms: Configuring for gui/windowing platforms:
@ -2198,8 +2271,8 @@ can call one of these functions. The selection and configuration
of row filters can have a significant impact on the size and of row filters can have a significant impact on the size and
encoding speed and a somewhat lesser impact on the decoding speed encoding speed and a somewhat lesser impact on the decoding speed
of an image. Filtering is enabled by default for RGB and grayscale of an image. Filtering is enabled by default for RGB and grayscale
images (with and without alpha), and for 8-bit paletted images, but images (with and without alpha), but not for paletted images nor
not for paletted images with bit depths less than 8 bits/pixel. for any images with bit depths less than 8 bits/pixel.
The 'method' parameter sets the main filtering method, which is The 'method' parameter sets the main filtering method, which is
currently only '0' in the PNG 1.0 specification. The 'filters' currently only '0' in the PNG 1.0 specification. The 'filters'
@ -2234,10 +2307,10 @@ by telling it the relative computational costs of the filters.
PNG_FILTER_SELECTION_WEIGHTED, 3, PNG_FILTER_SELECTION_WEIGHTED, 3,
weights, costs); weights, costs);
The weights are multiplying factors which indicate to libpng that row The weights are multiplying factors that indicate to libpng that the
should be the same for successive rows unless another row filter is that row filter should be the same for successive rows unless another row filter
many times better than the previous filter. In the above example, if is that many times better than the previous filter. In the above example,
the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a if the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a
"sum of absolute differences" 1.5 x 1.3 times higher than other filters "sum of absolute differences" 1.5 x 1.3 times higher than other filters
and still be chosen, while the NONE filter could have a sum 1.1 times and still be chosen, while the NONE filter could have a sum 1.1 times
higher than other filters and still be chosen. Unspecified weights are higher than other filters and still be chosen. Unspecified weights are
@ -2292,10 +2365,46 @@ or DLL file), you should not remove or disable any parts of the library,
as this will cause applications linked with different versions of the as this will cause applications linked with different versions of the
library to fail if they call functions not available in your library. 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 The size of the library itself should not be an issue, because only
those sections which are actually used will be loaded into memory. those sections that are actually used will be loaded into memory.
Requesting debug printout:
Changes to Libpng from version 0.88 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
numbers result in increasing amounts of debugging information. The
information is printed to the "stderr" file, unless another file
name is specified in the PNG_DEBUG_FILE macro definition.
When PNG_DEBUG > 0, the following functions (macros) become available:
png_debug(level, message)
png_debug1(level, message, p1)
png_debug2(level, message, p1, p2)
in which "level" is compared to PNG_DEBUG to decide whether to print
the message, "message" is the formatted string to be printed,
and p1 and p2 are parameters that are to be embedded in the string
according to printf-style formatting directives. For example,
png_debug1(2, "foo=%d\n", foo);
is expanded to
if(PNG_DEBUG > 2)
fprintf(PNG_DEBUG_FILE, "foo=%d\n", foo);
When PNG_DEBUG is defined but is zero, the macros aren't defined, but you
can still use PNG_DEBUG to control your own debugging:
#ifdef PNG_DEBUG
fprintf(stderr, ...
#endif
When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
.SH VI. Changes to Libpng from version 0.88
It should be noted that versions of libpng later than 0.96 are not It should be noted that versions of libpng later than 0.96 are not
distributed by the original libpng author, Guy Schalnat, nor by distributed by the original libpng author, Guy Schalnat, nor by
@ -2321,7 +2430,7 @@ allocating and freeing the png_struct for each image read.
Setting the error callbacks via png_set_message_fn() before Setting the error callbacks via png_set_message_fn() before
png_read_init() as was suggested in libpng-0.88 is no longer supported png_read_init() as was suggested in libpng-0.88 is no longer supported
because this caused applications which do not use custom error functions because this caused applications that do not use custom error functions
to fail if the png_ptr was not initialized to zero. It is still possible to fail if the png_ptr was not initialized to zero. It is still possible
to set the error callbacks AFTER png_read_init(), or to change them with to set the error callbacks AFTER png_read_init(), or to change them with
png_set_error_fn(), which is essentially the same function, but with a png_set_error_fn(), which is essentially the same function, but with a
@ -2413,7 +2522,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation. Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.0.2 - June 14, 1998: Libpng version 1.0.2a - December 29, 1998:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc. Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu). Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).

146
libpng.txt
View File

@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng libpng.txt - A description on how to use and modify libpng
libpng version 1.0.2 - June 14, 1998 libpng version 1.0.2a - December 29, 1998
Updated and distributed by Glenn Randers-Pehrson Updated and distributed by Glenn Randers-Pehrson
<randeg@alumni.rpi.edu> <randeg@alumni.rpi.edu>
Copyright (c) 1998, Glenn Randers-Pehrson Copyright (c) 1998, Glenn Randers-Pehrson
@ -40,7 +40,8 @@ as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
additional chunks are described in the special-purpose public chunks additional chunks are described in the special-purpose public chunks
documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information
about PNG can be found at the PNG home page, <http://www.cdrom.com/pub/png/>. about PNG, and the latest version of libpng, can be found at the PNG home
page, <http://www.cdrom.com/pub/png/>.
Most users will not have to modify the library significantly; advanced Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as users may want to modify it more. All attempts were made to make it as
@ -57,6 +58,8 @@ work to be done (see the TODO file), libpng should cover the
majority of the needs of its users. majority of the needs of its users.
Libpng uses zlib for its compression and decompression of PNG files. Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng. useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details. See the documentation delivered with zlib for more details.
@ -179,8 +182,8 @@ are only necessary if you are not using the libpng supplied error
handling and memory alloc/free functions. handling and memory alloc/free functions.
When libpng encounters an error, it expects to longjmp back When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass the to your routine. Therefore, you will need to call setjmp and pass
jmpbuf field of your png_struct. If you read the file from different your png_ptr->jmpbuf. If you read the file from different
routines, you will need to update the jmpbuf field every time you enter routines, you will need to update the jmpbuf field every time you enter
a new routine that will call a png_ function. a new routine that will call a png_ function.
@ -588,6 +591,63 @@ RGB. This code will do that conversion:
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr); png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
with alpha. This is intended for conversion of images that really are
gray (red == green == blue), so the function simply strips out the red
and blue channels, leaving the green channel in the gray position.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_rgb_to_gray(png_ptr, error_action,
float red_weight, float green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
image has any pixel where
red != green or red != blue
error_action = 3: issue an error and abort the
conversion if the original
image has any pixel where
red != green or red != blue
red_weight: weight of red component
(NULL -> default 54/256)
green_weight: weight of green component
(NULL -> default 183/256)
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
the image rows, with the png_get_rgb_to_gray_status(png_ptr) function.
It will return a png_byte that is zero if the image was gray or
1 if there were any non-gray pixels. bKGD and sBIT data
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
With 0.0<=red_weight+green_weight<=1.0,
the normalized graylevel is computed:
int rw = red_weight * 256;
int gw = green_weight * 256;
int bw = 256 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/256;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
Libpng approximates this with
Y = 0.211 * R + 0.715 * G + 0.074 * B
which can be expressed with integers as
Y = (54 * R + 183 * G + 19 * B)/256
The calculation is done in a linear colorspace, if the image gamma
is known.
If you have a grayscale and you are using png_set_expand() to change to If you have a grayscale and you are using png_set_expand() to change to
a higher bit-depth, you must either supply the background color as a gray a higher bit-depth, you must either supply the background color as a gray
value at the original file bit-depth (need_expand = 1) or else supply the value at the original file bit-depth (need_expand = 1) or else supply the
@ -647,7 +707,7 @@ compensation other than the display_gamma is needed (viewing_gamma=1.0).
The png_set_gamma() function handles gamma transformations of the data. The png_set_gamma() function handles gamma transformations of the data.
Pass both the file gamma and the current screen_gamma. If the file does Pass both the file gamma and the current screen_gamma. If the file does
not have a gamma value, you can pass one anyway if you have an idea what not have a gamma value, you can pass one anyway if you have an idea what
it is (usually 0.50 is a good guess for GIF images on PCs). Note it is (usually 0.45455 is a good guess for GIF images on PCs). Note
that file gammas are inverted from screen gammas. See the discussions that file gammas are inverted from screen gammas. See the discussions
on gamma in the PNG specification for an excellent description of what on gamma in the PNG specification for an excellent description of what
gamma is, and why all applications should support it. It is strongly gamma is, and why all applications should support it. It is strongly
@ -656,7 +716,7 @@ recommended that PNG viewers support gamma correction.
if (png_get_gAMA(png_ptr, info_ptr, &gamma)) if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, screen_gamma, gamma); png_set_gamma(png_ptr, screen_gamma, gamma);
else else
png_set_gamma(png_ptr, screen_gamma, 0.50); png_set_gamma(png_ptr, screen_gamma, 0.45455);
If you need to reduce an RGB file to a paletted file, or if a paletted If you need to reduce an RGB file to a paletted file, or if a paletted
file has more entries then will fit on your screen, png_set_dither() file has more entries then will fit on your screen, png_set_dither()
@ -907,7 +967,9 @@ png_infop info_ptr;
to be called when the header info is valid, to be called when the header info is valid,
when each row is completed, and when the image when each row is completed, and when the image
is finished. If you aren't using all functions, is finished. If you aren't using all functions,
you can specify a NULL parameter. You can use you can specify NULL parameters. Even when all
three functions are NULL, you need to call
png_set_progressive_read_fn(). You can use
any struct as the user_ptr (cast to a void pointer any struct as the user_ptr (cast to a void pointer
for the function call), and retrieve the pointer for the function call), and retrieve the pointer
from inside the callbacks using the function from inside the callbacks using the function
@ -953,7 +1015,7 @@ png_infop info_ptr;
} }
/* This function is called (as set by /* This function is called (as set by
png_set_progressive_fn() above) when enough data png_set_progressive_read_fn() above) when enough data
has been supplied so all of the header has been has been supplied so all of the header has been
read. read.
*/ */
@ -1081,7 +1143,7 @@ png_create_write_struct_2() instead of png_create_read_struct():
After you have these structures, you will need to set up the After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call longjmp() back to your routine. Therefore, you will need to call
setjmp and pass the jmpbuf field of your png_struct. If you setjmp() and pass the png_ptr->jmpbuf. If you
write the file from different routines, you will need to update write the file from different routines, you will need to update
the jmpbuf field every time you enter a new routine that will the jmpbuf field every time you enter a new routine that will
call a png_ function. See your documentation of setjmp/longjmp call a png_ function. See your documentation of setjmp/longjmp
@ -1095,6 +1157,8 @@ section below for more information on the libpng error handling.
fclose(fp); fclose(fp);
return; return;
} }
...
return;
Now you need to set up the output code. The default for libpng is to 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 use the C function fwrite(). If you use this, you will need to pass a
@ -1325,7 +1389,7 @@ png_text structure holds a keyword-text value, and a compression type.
The compression types have the same valid numbers as the compression The compression types have the same valid numbers as the compression
types of the image data. Currently, the only valid number is zero. types of the image data. Currently, the only valid number is zero.
However, you can store text either compressed or uncompressed, unlike However, you can store text either compressed or uncompressed, unlike
images which always have to be compressed. So if you don't want the images, which always have to be compressed. So if you don't want the
text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE. text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE.
Until text gets around 1000 bytes, it is not worth compressing it. Until text gets around 1000 bytes, it is not worth compressing it.
After the text has been written out to the file, the compression type After the text has been written out to the file, the compression type
@ -1385,7 +1449,7 @@ depending on whether you mean the PNG file, the time the image was
created in a non-PNG format, a still photo from which the image was created in a non-PNG format, a still photo from which the image was
scanned, or possibly the subject matter itself. In order to facilitate scanned, or possibly the subject matter itself. In order to facilitate
machine-readable dates, it is recommended that the "Creation Time" machine-readable dates, it is recommended that the "Creation Time"
tEXt chunk use RFC 1123 format dates (e.g. 22 May 1997 18:07:10 GMT"), tEXt chunk use RFC 1123 format dates (e.g. "22 May 1997 18:07:10 GMT"),
although this isn't a requirement. Unlike the tIME chunk, the although this isn't a requirement. Unlike the tIME chunk, the
"Creation Time" tEXt chunk is not expected to be automatically changed "Creation Time" tEXt chunk is not expected to be automatically changed
by the software. To facilitate the use of RFC 1123 dates, a function by the software. To facilitate the use of RFC 1123 dates, a function
@ -1603,7 +1667,7 @@ The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works. adding new transformations, and generally changing how libpng works.
All of the memory allocation, input/output, and error handling in libpng All of the memory allocation, input/output, and error handling in libpng
goes through callbacks which are user settable. The default routines are goes through callbacks that are user settable. The default routines are
in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change
these functions, call the appropriate png_set_???_fn() function. these functions, call the appropriate png_set_???_fn() function.
@ -1712,7 +1776,7 @@ won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
Configuring for DOS: Configuring for DOS:
For DOS users which only have access to the lower 640K, you will 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() 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. call. See zlib.h or zconf.h in the zlib library for more information.
@ -1724,7 +1788,7 @@ 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 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 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 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 a note that the row's of data are defined as png_bytepp, which is an
unsigned char far * far *. unsigned char far * far *.
Configuring for gui/windowing platforms: Configuring for gui/windowing platforms:
@ -1784,8 +1848,8 @@ can call one of these functions. The selection and configuration
of row filters can have a significant impact on the size and of row filters can have a significant impact on the size and
encoding speed and a somewhat lesser impact on the decoding speed encoding speed and a somewhat lesser impact on the decoding speed
of an image. Filtering is enabled by default for RGB and grayscale of an image. Filtering is enabled by default for RGB and grayscale
images (with and without alpha), and for 8-bit paletted images, but images (with and without alpha), but not for paletted images nor
not for paletted images with bit depths less than 8 bits/pixel. for any images with bit depths less than 8 bits/pixel.
The 'method' parameter sets the main filtering method, which is The 'method' parameter sets the main filtering method, which is
currently only '0' in the PNG 1.0 specification. The 'filters' currently only '0' in the PNG 1.0 specification. The 'filters'
@ -1820,10 +1884,10 @@ by telling it the relative computational costs of the filters.
PNG_FILTER_SELECTION_WEIGHTED, 3, PNG_FILTER_SELECTION_WEIGHTED, 3,
weights, costs); weights, costs);
The weights are multiplying factors which indicate to libpng that row The weights are multiplying factors that indicate to libpng that the
should be the same for successive rows unless another row filter is that row filter should be the same for successive rows unless another row filter
many times better than the previous filter. In the above example, if is that many times better than the previous filter. In the above example,
the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a if the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a
"sum of absolute differences" 1.5 x 1.3 times higher than other filters "sum of absolute differences" 1.5 x 1.3 times higher than other filters
and still be chosen, while the NONE filter could have a sum 1.1 times and still be chosen, while the NONE filter could have a sum 1.1 times
higher than other filters and still be chosen. Unspecified weights are higher than other filters and still be chosen. Unspecified weights are
@ -1878,10 +1942,46 @@ or DLL file), you should not remove or disable any parts of the library,
as this will cause applications linked with different versions of the as this will cause applications linked with different versions of the
library to fail if they call functions not available in your library. 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 The size of the library itself should not be an issue, because only
those sections which are actually used will be loaded into memory. those sections that are actually used will be loaded into memory.
Requesting debug printout:
Changes to Libpng from version 0.88 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
numbers result in increasing amounts of debugging information. The
information is printed to the "stderr" file, unless another file
name is specified in the PNG_DEBUG_FILE macro definition.
When PNG_DEBUG > 0, the following functions (macros) become available:
png_debug(level, message)
png_debug1(level, message, p1)
png_debug2(level, message, p1, p2)
in which "level" is compared to PNG_DEBUG to decide whether to print
the message, "message" is the formatted string to be printed,
and p1 and p2 are parameters that are to be embedded in the string
according to printf-style formatting directives. For example,
png_debug1(2, "foo=%d\n", foo);
is expanded to
if(PNG_DEBUG > 2)
fprintf(PNG_DEBUG_FILE, "foo=%d\n", foo);
When PNG_DEBUG is defined but is zero, the macros aren't defined, but you
can still use PNG_DEBUG to control your own debugging:
#ifdef PNG_DEBUG
fprintf(stderr, ...
#endif
When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
VI. Changes to Libpng from version 0.88
It should be noted that versions of libpng later than 0.96 are not It should be noted that versions of libpng later than 0.96 are not
distributed by the original libpng author, Guy Schalnat, nor by distributed by the original libpng author, Guy Schalnat, nor by
@ -1907,7 +2007,7 @@ allocating and freeing the png_struct for each image read.
Setting the error callbacks via png_set_message_fn() before Setting the error callbacks via png_set_message_fn() before
png_read_init() as was suggested in libpng-0.88 is no longer supported png_read_init() as was suggested in libpng-0.88 is no longer supported
because this caused applications which do not use custom error functions because this caused applications that do not use custom error functions
to fail if the png_ptr was not initialized to zero. It is still possible to fail if the png_ptr was not initialized to zero. It is still possible
to set the error callbacks AFTER png_read_init(), or to change them with to set the error callbacks AFTER png_read_init(), or to change them with
png_set_error_fn(), which is essentially the same function, but with a png_set_error_fn(), which is essentially the same function, but with a

6
libpngpf.3
View File

@ -1,6 +1,6 @@
.TH LIBPNGPF 3 "June 14, 1998" .TH LIBPNGPF 3 "December 29, 1998"
.SH NAME .SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.2 - June 14, 1998 libpng \- Portable Network Graphics (PNG) Reference Library 1.0.2a - December 29, 1998
(private functions) (private functions)
.SH SYNOPSIS .SH SYNOPSIS
#include <png.h> #include <png.h>
@ -88,7 +88,7 @@ row);
void png_do_read_transformations (png_structp png_ptr); void png_do_read_transformations (png_structp png_ptr);
void png_do_rgb_to_gray (png_row_infop row_info, png_bytep int png_do_rgb_to_gray (png_row_infop row_info, png_bytep
row); row);
void png_do_shift (png_row_infop row_info, png_bytep row, void png_do_shift (png_row_infop row_info, png_bytep row,

2
png.5
View File

@ -1,4 +1,4 @@
.TH PNG 5 "June 14, 1998" .TH PNG 5 "December 29, 1998"
.SH NAME .SH NAME
png \- Portable Network Graphics (PNG) format png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION .SH DESCRIPTION

17
png.c
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@ -1,11 +1,11 @@
/* png.c - location for general purpose libpng functions /* png.c - location for general purpose libpng functions
* *
* libpng 1.0.2 - June 14, 1998 * libpng version 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
*
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -15,7 +15,8 @@
/* Version information for C files. This had better match the version /* Version information for C files. This had better match the version
* string defined in png.h. * string defined in png.h.
*/ */
char png_libpng_ver[12] = "1.0.2";
char png_libpng_ver[12] = "1.0.2a";
/* Place to hold the signature string for a PNG file. */ /* Place to hold the signature string for a PNG file. */
png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@ -345,3 +346,13 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
return ((png_charp)png_ptr->time_buffer); return ((png_charp)png_ptr->time_buffer);
} }
#endif /* PNG_TIME_RFC1123_SUPPORTED */ #endif /* PNG_TIME_RFC1123_SUPPORTED */
png_charp
png_get_copyright(png_structp png_ptr)
{
return("\n libpng version 1.0.2a - December 29, 1998\n\
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
Copyright (c) 1996, 1997 Andreas Dilger\n\
Copyright (c) 1998, Glenn Randers-Pehrson\n");
}

83
png.h
View File

@ -1,11 +1,10 @@
/* png.h - header file for PNG reference library /* png.h - header file for PNG reference library
* *
* libpng 1.0.2 - June 14, 1998 * libpng version 1.0.2a - December 29, 1998
* For conditions of distribution and use, see the COPYRIGHT NOTICE below.
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998 Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* *
* Note about libpng version numbers: * Note about libpng version numbers:
* *
@ -31,6 +30,9 @@
* 1.0.0 1.0.0 100 2.1.0 [int should be 10000] * 1.0.0 1.0.0 100 2.1.0 [int should be 10000]
* 1.0.1 1.0.1 10001 2.1.0 * 1.0.1 1.0.1 10001 2.1.0
* 1.0.1a-e 1.0.1a-e 10002 2.1.0.1a-e * 1.0.1a-e 1.0.1a-e 10002 2.1.0.1a-e
* 1.0.2 1.0.2 10002 2.1.0.2
* 1.0.2a 1.0.2a 10003 2.1.0.2a
* 1.0.3 1.0.3 10003 2.1.0.3
* *
* Henceforth the source version will match the shared-library minor * Henceforth the source version will match the shared-library minor
* and patch numbers; the shared-library major version number will be * and patch numbers; the shared-library major version number will be
@ -117,14 +119,14 @@ extern "C" {
*/ */
/* Version information for png.h - this should match the version in png.c */ /* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.0.2" #define PNG_LIBPNG_VER_STRING "1.0.2a"
/* Careful here. At one time, Guy wanted to use 082, but that would be octal. /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros. * We must not include leading zeros.
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
* version 1.0.0 was mis-numbered 100 instead of 10000). From * version 1.0.0 was mis-numbered 100 instead of 10000). From
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=bugfix */ * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=bugfix */
#define PNG_LIBPNG_VER 10002 /* 1.0.2 */ #define PNG_LIBPNG_VER 10003 /* 1.0.3 */
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
@ -144,6 +146,7 @@ extern int FARDATA png_pass_dsp_mask[7];
extern int FARDATA png_pass_width[7]; extern int FARDATA png_pass_width[7];
extern int FARDATA png_pass_height[7]; extern int FARDATA png_pass_height[7];
*/ */
#endif /* PNG_NO_EXTERN */ #endif /* PNG_NO_EXTERN */
/* Three color definitions. The order of the red, green, and blue, (and the /* Three color definitions. The order of the red, green, and blue, (and the
@ -689,6 +692,12 @@ struct png_struct_def
png_malloc_ptr malloc_fn; /* function for allocating memory */ png_malloc_ptr malloc_fn; /* function for allocating memory */
png_free_ptr free_fn; /* function for freeing memory */ png_free_ptr free_fn; /* function for freeing memory */
#endif /* PNG_USER_MEM_SUPPORTED */ #endif /* PNG_USER_MEM_SUPPORTED */
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_byte rgb_to_gray_status;
png_byte rgb_to_gray_red_coeff;
png_byte rgb_to_gray_green_coeff;
png_byte rgb_to_gray_blue_coeff;
#endif
}; };
typedef png_struct FAR * FAR * png_structpp; typedef png_struct FAR * FAR * png_structpp;
@ -800,8 +809,11 @@ extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ #endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
/* Reduce RGB to grayscale. (Not yet implemented) */ /* Reduce RGB to grayscale. */
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr)); extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
int error_action, float red, float green ));
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
png_ptr));
#endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */ #endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
@ -1105,6 +1117,7 @@ extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp));
* method of error handling. If error_fn or warning_fn is NULL, the * method of error handling. If error_fn or warning_fn is NULL, the
* default function will be used. * default function will be used.
*/ */
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
@ -1449,28 +1462,42 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
* only been added since version 0.95 so it is not implemented throughout * only been added since version 0.95 so it is not implemented throughout
* libpng yet, but more support will be added as needed. * libpng yet, but more support will be added as needed.
*/ */
#ifdef PNG_DEBUG
#if (PNG_DEBUG > 0) #if (PNG_DEBUG > 0)
#ifdef PNG_NO_STDIO
#include <stdio.h>
#endif
#ifndef PNG_DEBUG_FILE #ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr #define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */ #endif /* PNG_DEBUG_FILE */
#define png_debug(l,m) if (PNG_DEBUG > l) \ #define png_debug(l,m) if (PNG_DEBUG > l) \
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
(l==2 ? "\t\t":(l==3 ? "\t\t\t":"")))) (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))))
#define png_debug1(l,m,p1) if (PNG_DEBUG > l) \ #define png_debug1(l,m,p1) if (PNG_DEBUG > l) \
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1) (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1)
#define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \ #define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \ fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1,p2) (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1,p2)
#else
#define png_debug(l, m)
#define png_debug1(l, m, p1)
#define png_debug2(l, m, p1, p2)
#endif /* (PNG_DEBUG > 0) */ #endif /* (PNG_DEBUG > 0) */
#endif /* PNG_DEBUG */
#ifndef png_debug
#define png_debug(l, m)
#endif
#ifndef png_debug1
#define png_debug1(l, m, p1)
#endif
#ifndef png_debug2
#define png_debug2(l, m, p1, p2)
#endif
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
#ifdef PNG_NO_EXTERN
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
png_charp
png_get_header_version(png_structp png_ptr)
{
return("\n libpng version 1.0.2a - December 29, 1998 (header)\n");
}
#endif
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
/* With these routines we avoid an integer divide, which will be slower on /* With these routines we avoid an integer divide, which will be slower on
@ -1486,11 +1513,13 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
*/ */
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
# define png_composite(composite, fg, alpha, bg) \ # define png_composite(composite, fg, alpha, bg) \
{ png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \ { png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \
(png_uint_16)(bg)*(png_uint_16)(255 - \ (png_uint_16)(bg)*(png_uint_16)(255 - \
(png_uint_16)(alpha)) + (png_uint_16)128); \ (png_uint_16)(alpha)) + (png_uint_16)128); \
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); } (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
# define png_composite_16(composite, fg, alpha, bg) \ # define png_composite_16(composite, fg, alpha, bg) \
{ png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \ { png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \
(png_uint_32)(bg)*(png_uint_32)(65535L - \ (png_uint_32)(bg)*(png_uint_32)(65535L - \
@ -1499,11 +1528,11 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#else /* standard method using integer division */ #else /* standard method using integer division */
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
# define png_composite(composite, fg, alpha, bg) \ # define png_composite(composite, fg, alpha, bg) \
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
(png_uint_16)127) / 255) (png_uint_16)127) / 255)
# define png_composite_16(composite, fg, alpha, bg) \ # define png_composite_16(composite, fg, alpha, bg) \
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
@ -1552,7 +1581,7 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define PNG_DITHER 0x0040 #define PNG_DITHER 0x0040
#define PNG_BACKGROUND 0x0080 #define PNG_BACKGROUND 0x0080
#define PNG_BACKGROUND_EXPAND 0x0100 #define PNG_BACKGROUND_EXPAND 0x0100
#define PNG_RGB_TO_GRAY 0x0200 /* Not currently implemented */ /* 0x0200 unused */
#define PNG_16_TO_8 0x0400 #define PNG_16_TO_8 0x0400
#define PNG_RGBA 0x0800 #define PNG_RGBA 0x0800
#define PNG_EXPAND 0x1000 #define PNG_EXPAND 0x1000
@ -1564,6 +1593,9 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define PNG_STRIP_ALPHA 0x40000L #define PNG_STRIP_ALPHA 0x40000L
#define PNG_INVERT_ALPHA 0x80000L #define PNG_INVERT_ALPHA 0x80000L
#define PNG_USER_TRANSFORM 0x100000L #define PNG_USER_TRANSFORM 0x100000L
#define PNG_RGB_TO_GRAY_ERR 0x200000L
#define PNG_RGB_TO_GRAY_WARN 0x400000L
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
/* flags for png_create_struct */ /* flags for png_create_struct */
#define PNG_STRUCT_PNG 0x0001 #define PNG_STRUCT_PNG 0x0001
@ -1725,8 +1757,8 @@ PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
#endif #endif
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
* The only currently known PNG chunk that uses signed numbers is * The only currently known PNG chunks that use signed numbers are
* the ancillary extension chunk, pCAL. * the ancillary extension chunks, oFFs and pCAL.
*/ */
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
@ -1922,8 +1954,8 @@ PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
PNG_EXTERN void png_do_rgb_to_gray PNGARG((png_row_infop row_info, PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
png_bytep row)); row_info, png_bytep row));
#endif #endif
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
@ -2128,11 +2160,16 @@ PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
#endif
#endif /* PNG_INTERNAL */ #endif /* PNG_INTERNAL */
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif
#ifdef PNG_NO_EXTERN
/* do not put anything past this line */ /* do not put anything past this line */
#endif /* _PNG_H */ #endif /* _PNG_H */

26
pngconf.h
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@ -1,7 +1,7 @@
/* pngconf.h - machine configurable file for libpng /* pngconf.h - machine configurable file for libpng
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -17,6 +17,7 @@
#ifndef PNGCONF_H #ifndef PNGCONF_H
#define PNGCONF_H #define PNGCONF_H
/* This is the size of the compression buffer, and thus the size of /* This is the size of the compression buffer, and thus the size of
* an IDAT chunk. Make this whatever size you feel is best for your * an IDAT chunk. Make this whatever size you feel is best for your
* machine. One of these will be allocated per png_struct. When this * machine. One of these will be allocated per png_struct. When this
@ -49,14 +50,29 @@
/* This protects us against compilers that run on a windowing system /* This protects us against compilers that run on a windowing system
* and thus don't have or would rather us not use the stdio types: * and thus don't have or would rather us not use the stdio types:
* stdin, stdout, and stderr. The only one currently used is stderr * stdin, stdout, and stderr. The only one currently used is stderr
* in png_error() and png_warning(). #defining PNG_NO_STDIO will * in png_error() and png_warning(). #defining PNG_NO_CONSOLE_IO will
* prevent these from being compiled and used. * prevent these from being compiled and used. #defining PNG_NO_STDIO
* will also prevent these, plus will prevent the entire set of stdio
* macros and functions (FILE *, printf, etc.) from being compiled and used,
* unless PNG_DEBUG has been #defined.
*
* #define PNG_NO_CONSOLE_IO
* #define PNG_NO_STDIO * #define PNG_NO_STDIO
*/ */
#ifndef PNG_NO_STDIO #ifdef PNG_DEBUG
# if (PNG_DEBUG > 0)
# include <stdio.h> # include <stdio.h>
# endif # endif
#else
# ifdef PNG_NO_STDIO
# ifndef PNG_NO_CONSOLE_IO
# define PNG_NO_CONSOLE_IO
# endif
# else
# include <stdio.h>
# endif
#endif
/* This macro protects us against machines that don't have function /* This macro protects us against machines that don't have function
* prototypes (ie K&R style headers). If your compiler does not handle * prototypes (ie K&R style headers). If your compiler does not handle
@ -307,11 +323,9 @@ __dont__ include it again
#ifndef PNG_NO_READ_USER_TRANSFORM #ifndef PNG_NO_READ_USER_TRANSFORM
#define PNG_READ_USER_TRANSFORM_SUPPORTED #define PNG_READ_USER_TRANSFORM_SUPPORTED
#endif #endif
/* the following aren't implemented yet
#ifndef PNG_NO_READ_RGB_TO_GRAY #ifndef PNG_NO_READ_RGB_TO_GRAY
#define PNG_READ_RGB_TO_GRAY_SUPPORTED #define PNG_READ_RGB_TO_GRAY_SUPPORTED
#endif #endif
*/
#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ #endif /* PNG_READ_TRANSFORMS_SUPPORTED */
#if !defined(PNG_NO_PROGRESSIVE_READ) && \ #if !defined(PNG_NO_PROGRESSIVE_READ) && \

6
pngerror.c
View File

@ -1,7 +1,7 @@
/* pngerror.c - stub functions for i/o and memory allocation /* pngerror.c - stub functions for i/o and memory allocation
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -113,7 +113,7 @@ png_chunk_warning(png_structp png_ptr, png_const_charp message)
static void static void
png_default_error(png_structp png_ptr, png_const_charp message) png_default_error(png_structp png_ptr, png_const_charp message)
{ {
#ifndef PNG_NO_STDIO #ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "libpng error: %s\n", message); fprintf(stderr, "libpng error: %s\n", message);
#endif #endif
@ -139,7 +139,7 @@ png_default_warning(png_structp png_ptr, png_const_charp message)
if (png_ptr == NULL) if (png_ptr == NULL)
return; return;
#ifndef PNG_NO_STDIO #ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "libpng warning: %s\n", message); fprintf(stderr, "libpng warning: %s\n", message);
#endif #endif
} }

9
pngget.c
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@ -1,7 +1,7 @@
/* pngget.c - retrieval of values from info struct /* pngget.c - retrieval of values from info struct
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -641,3 +641,10 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
} }
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_byte
png_get_rgb_to_gray_status (png_structp png_ptr)
{
return png_ptr->rgb_to_gray_status;
}
#endif

4
pngmem.c
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@ -1,7 +1,7 @@
/* pngmem.c - stub functions for memory allocation /* pngmem.c - stub functions for memory allocation
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -130,7 +130,7 @@ png_voidp
png_malloc_default(png_structp png_ptr, png_uint_32 size) png_malloc_default(png_structp png_ptr, png_uint_32 size)
{ {
png_voidp ret; png_voidp ret;
#endif PNG_USER_MEM_SUPPORTED #endif /* PNG_USER_MEM_SUPPORTED */
#ifdef PNG_MAX_MALLOC_64K #ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L) if (size > (png_uint_32)65536L)

16
pngpread.c
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@ -1,7 +1,7 @@
/* pngpread.c - read a png file in push mode /* pngpread.c - read a png file in push mode
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -781,6 +781,7 @@ png_read_push_finish_row(png_structp png_ptr)
png_ptr->pass++; png_ptr->pass++;
if (png_ptr->pass >= 7) if (png_ptr->pass >= 7)
break; break;
png_ptr->iwidth = (png_ptr->width + png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 - png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) / png_pass_start[png_ptr->pass]) /
@ -789,18 +790,15 @@ png_read_push_finish_row(png_structp png_ptr)
png_ptr->irowbytes = ((png_ptr->iwidth * png_ptr->irowbytes = ((png_ptr->iwidth *
png_ptr->pixel_depth + 7) >> 3) + 1; png_ptr->pixel_depth + 7) >> 3) + 1;
if (!(png_ptr->transformations & PNG_INTERLACE)) if (png_ptr->transformations & PNG_INTERLACE)
{ break;
png_ptr->num_rows = (png_ptr->height + png_ptr->num_rows = (png_ptr->height +
png_pass_yinc[png_ptr->pass] - 1 - png_pass_yinc[png_ptr->pass] - 1 -
png_pass_ystart[png_ptr->pass]) / png_pass_ystart[png_ptr->pass]) /
png_pass_yinc[png_ptr->pass]; png_pass_yinc[png_ptr->pass];
if (!(png_ptr->num_rows))
continue; } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
}
if (png_ptr->transformations & PNG_INTERLACE)
break;
} while (png_ptr->iwidth == 0);
} }
} }

12
pngread.c
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@ -1,7 +1,7 @@
/* pngread.c - read a PNG file /* pngread.c - read a PNG file
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -530,7 +530,7 @@ 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 * not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it. * be ignored, so pass NULL to it.
* *
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.2. * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.2a.
*/ */
void void
@ -579,7 +579,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
* only call this function once. If you desire to have an image for * only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead. * each pass of a interlaced image, use png_read_rows() instead.
* *
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.2. * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.2a.
*/ */
void void
png_read_image(png_structp png_ptr, png_bytepp image) png_read_image(png_structp png_ptr, png_bytepp image)
@ -820,9 +820,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
{ {
png_free(png_ptr, png_ptr->gamma_16_table[i]); png_free(png_ptr, png_ptr->gamma_16_table[i]);
} }
png_free(png_ptr, png_ptr->gamma_16_table);
} }
#if defined(PNG_READ_BACKGROUND_SUPPORTED) #if defined(PNG_READ_BACKGROUND_SUPPORTED)
png_free(png_ptr, png_ptr->gamma_16_table);
if (png_ptr->gamma_16_from_1 != NULL) if (png_ptr->gamma_16_from_1 != NULL)
{ {
int i; int i;
@ -831,8 +831,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
{ {
png_free(png_ptr, png_ptr->gamma_16_from_1[i]); png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
} }
}
png_free(png_ptr, png_ptr->gamma_16_from_1); png_free(png_ptr, png_ptr->gamma_16_from_1);
}
if (png_ptr->gamma_16_to_1 != NULL) if (png_ptr->gamma_16_to_1 != NULL)
{ {
int i; int i;
@ -841,8 +841,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
{ {
png_free(png_ptr, png_ptr->gamma_16_to_1[i]); png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
} }
}
png_free(png_ptr, png_ptr->gamma_16_to_1); png_free(png_ptr, png_ptr->gamma_16_to_1);
}
#endif #endif
#endif #endif
#if defined(PNG_TIME_RFC1123_SUPPORTED) #if defined(PNG_TIME_RFC1123_SUPPORTED)

2
pngrio.c
View File

@ -1,7 +1,7 @@
/* pngrio.c - functions for data input /* pngrio.c - functions for data input
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger

441
pngrtran.c
View File

@ -1,7 +1,7 @@
/* pngrtran.c - transforms the data in a row for PNG readers /* pngrtran.c - transforms the data in a row for PNG readers
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -284,8 +284,8 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
don't always behave themselves with only a few colors don't always behave themselves with only a few colors
as input. So we will just find the closest two colors, as input. So we will just find the closest two colors,
and throw out one of them (chosen somewhat randomly). and throw out one of them (chosen somewhat randomly).
[I don't understand this at all, so if someone wants to [We don't understand this at all, so if someone wants to
work on improving it, be my guest - AED] work on improving it, be our guest - AED, GRP]
*/ */
int i; int i;
int max_d; int max_d;
@ -544,17 +544,49 @@ png_set_gray_to_rgb(png_structp png_ptr)
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
/* Convert a RGB image to a grayscale of the given width. This would /* Convert a RGB image to a grayscale of the same width. This allows us,
* allow us, for example, to convert a 24 bpp RGB image into an 8 or * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
* 16 bpp grayscale image. (Not yet implemented.)
*/ */
void void
png_set_rgb_to_gray(png_structp png_ptr, int gray_bits) png_set_rgb_to_gray(png_structp png_ptr, int error_action, float red,
float green)
{ {
png_debug(1, "in png_set_rgb_to_gray\n"); png_debug(1, "in png_set_rgb_to_gray\n");
png_ptr->transformations |= PNG_RGB_TO_GRAY; switch(error_action)
/* Need to do something with gray_bits here. */ {
png_warning(png_ptr, "RGB to GRAY transformation is not yet implemented."); case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY;
break;
case 2: png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN;
break;
case 3: png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR;
}
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
#if defined(PNG_READ_EXPAND_SUPPORTED)
png_ptr->transformations |= PNG_EXPAND;
#else
{
png_warning(png_ptr, "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED.");
png_ptr->transformations &= ~PNG_RGB_TO_GRAY;
}
#endif
{
png_byte red_byte = (png_byte)(red*255.0 + 0.5);
png_byte green_byte = (png_byte)(green*255.0 + 0.5);
if(red < 0.0 || green < 0.0)
{
red_byte = 54;
green_byte = 183;
}
else if(red_byte + green_byte > 255)
{
png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
red_byte = 54;
green_byte = 183;
}
png_ptr->rgb_to_gray_red_coeff = red_byte;
png_ptr->rgb_to_gray_green_coeff = green_byte;
png_ptr->rgb_to_gray_blue_coeff = 255 - red_byte - green_byte;
}
} }
#endif #endif
@ -649,7 +681,7 @@ png_init_read_transformations(png_structp png_ptr)
png_ptr->background_1 = png_ptr->background; png_ptr->background_1 = png_ptr->background;
#endif #endif
#if defined(PNG_READ_GAMMA_SUPPORTED) #if defined(PNG_READ_GAMMA_SUPPORTED)
if (png_ptr->transformations & PNG_GAMMA) if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY))
{ {
png_build_gamma_table(png_ptr); png_build_gamma_table(png_ptr);
#if defined(PNG_READ_BACKGROUND_SUPPORTED) #if defined(PNG_READ_BACKGROUND_SUPPORTED)
@ -958,6 +990,11 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
info_ptr->color_type |= PNG_COLOR_MASK_COLOR; info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if (png_ptr->transformations & PNG_RGB_TO_GRAY)
info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR;
#endif
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
info_ptr->channels = 1; info_ptr->channels = 1;
else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
@ -1035,6 +1072,22 @@ png_do_read_transformations(png_structp png_ptr)
PNG_FLAG_FILLER_AFTER); PNG_FLAG_FILLER_AFTER);
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if (png_ptr->transformations & PNG_RGB_TO_GRAY)
{
int rgb_error =
png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1);
if(rgb_error)
{
png_ptr->rgb_to_gray_status=1;
if(png_ptr->transformations == PNG_RGB_TO_GRAY_WARN)
png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
if(png_ptr->transformations == PNG_RGB_TO_GRAY_ERR)
png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
}
}
#endif
/* /*
From Andreas Dilger e-mail to png-implement, 26 March 1998: From Andreas Dilger e-mail to png-implement, 26 March 1998:
@ -1099,11 +1152,6 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
png_ptr->gamma_shift); png_ptr->gamma_shift);
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if (png_ptr->transformations & PNG_RGB_TO_GRAY)
png_do_rgb_to_gray(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_READ_16_TO_8_SUPPORTED) #if defined(PNG_READ_16_TO_8_SUPPORTED)
if (png_ptr->transformations & PNG_16_TO_8) if (png_ptr->transformations & PNG_16_TO_8)
png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1); png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1);
@ -1359,7 +1407,6 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
} }
break; break;
} }
#ifndef PNG_SLOW_SHIFT
case 8: case 8:
{ {
png_bytep bp = row; png_bytep bp = row;
@ -1387,43 +1434,6 @@ png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
} }
break; break;
} }
#else
case 8:
{
png_bytep bp;
png_uint_32 i;
int cstop;
cstop=(int)row_info->channels;
for (bp = row, i = 0; i < row_width; i++)
{
for (c = 0; c < cstop; c++, bp++)
{
*bp >>= shift[c];
}
}
break;
}
case 16:
{
png_bytep bp;
png_size_t i;
int cstop;
cstop=(int)row_info->channels;
for (bp = row, i = 0; i < row_width; i++)
{
for (c = 0; c < cstop; c++, bp += 2)
{
value = (png_uint_16)((*bp << 8) + *(bp + 1));
value >>= shift[c];
*bp = (png_byte)(value >> 8);
*(bp + 1) = (png_byte)(value & 0xff);
}
}
break;
}
#endif
} }
} }
} }
@ -1668,7 +1678,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
png_uint_32 row_width = row_info->width; png_uint_32 row_width = row_info->width;
png_byte hi_filler = (png_byte)((filler>>8) & 0xff); png_byte hi_filler = (png_byte)((filler>>8) & 0xff);
png_byte low_filler = (png_byte)(filler & 0xff); png_byte lo_filler = (png_byte)(filler & 0xff);
png_debug(1, "in png_do_read_filler\n"); png_debug(1, "in png_do_read_filler\n");
if ( if (
@ -1686,9 +1696,10 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
png_bytep dp = sp + (png_size_t)row_width; png_bytep dp = sp + (png_size_t)row_width;
for (i = 1; i < row_width; i++) for (i = 1; i < row_width; i++)
{ {
*(--dp) = low_filler; *(--dp) = lo_filler;
*(--dp) = *(--sp); *(--dp) = *(--sp);
} }
*(--dp) = lo_filler;
row_info->channels = 2; row_info->channels = 2;
row_info->pixel_depth = 16; row_info->pixel_depth = 16;
row_info->rowbytes = row_width * 2; row_info->rowbytes = row_width * 2;
@ -1701,7 +1712,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
for (i = 0; i < row_width; i++) for (i = 0; i < row_width; i++)
{ {
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = low_filler; *(--dp) = lo_filler;
} }
row_info->channels = 2; row_info->channels = 2;
row_info->pixel_depth = 16; row_info->pixel_depth = 16;
@ -1718,10 +1729,12 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
for (i = 1; i < row_width; i++) for (i = 1; i < row_width; i++)
{ {
*(--dp) = hi_filler; *(--dp) = hi_filler;
*(--dp) = low_filler; *(--dp) = lo_filler;
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
} }
*(--dp) = hi_filler;
*(--dp) = lo_filler;
row_info->channels = 2; row_info->channels = 2;
row_info->pixel_depth = 32; row_info->pixel_depth = 32;
row_info->rowbytes = row_width * 2; row_info->rowbytes = row_width * 2;
@ -1736,7 +1749,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = hi_filler; *(--dp) = hi_filler;
*(--dp) = low_filler; *(--dp) = lo_filler;
} }
row_info->channels = 2; row_info->channels = 2;
row_info->pixel_depth = 16; row_info->pixel_depth = 16;
@ -1755,11 +1768,12 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
png_bytep dp = sp + (png_size_t)row_width; png_bytep dp = sp + (png_size_t)row_width;
for (i = 1; i < row_width; i++) for (i = 1; i < row_width; i++)
{ {
*(--dp) = low_filler; *(--dp) = lo_filler;
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
} }
*(--dp) = lo_filler;
row_info->channels = 4; row_info->channels = 4;
row_info->pixel_depth = 32; row_info->pixel_depth = 32;
row_info->rowbytes = row_width * 4; row_info->rowbytes = row_width * 4;
@ -1774,7 +1788,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = low_filler; *(--dp) = lo_filler;
} }
row_info->channels = 4; row_info->channels = 4;
row_info->pixel_depth = 32; row_info->pixel_depth = 32;
@ -1791,7 +1805,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
for (i = 1; i < row_width; i++) for (i = 1; i < row_width; i++)
{ {
*(--dp) = hi_filler; *(--dp) = hi_filler;
*(--dp) = low_filler; *(--dp) = lo_filler;
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
@ -1799,6 +1813,8 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
} }
*(--dp) = hi_filler;
*(--dp) = lo_filler;
row_info->channels = 4; row_info->channels = 4;
row_info->pixel_depth = 64; row_info->pixel_depth = 64;
row_info->rowbytes = row_width * 4; row_info->rowbytes = row_width * 4;
@ -1817,7 +1833,7 @@ png_do_read_filler(png_row_infop row_info, png_bytep row,
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = *(--sp); *(--dp) = *(--sp);
*(--dp) = hi_filler; *(--dp) = hi_filler;
*(--dp) = low_filler; *(--dp) = lo_filler;
} }
row_info->channels = 4; row_info->channels = 4;
row_info->pixel_depth = 64; row_info->pixel_depth = 64;
@ -1918,6 +1934,261 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
} }
#endif #endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
/* reduce RGB files to grayscale, with or without alpha
* using the equation given in Poynton's ColorFAQ at
* <http://www.inforamp.net/~poynton/>
* Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
*
* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
*
* We approximate this with
*
* Y = 0.211 * R + 0.715 * G + 0.074 * B
*
* which can be expressed with integers as
*
* Y = (54 * R + 183 * G + 19 * B)/256
*
* The calculation is to be done in a linear colorspace.
*
* Other integer coefficents can be used via png_set_rgb_to_gray().
*/
int
png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
{
png_uint_32 i;
png_uint_32 row_width = row_info->width;
int rgb_error = 0;
png_debug(1, "in png_do_rgb_to_gray\n");
if (
#if defined(PNG_USELESS_TESTS_SUPPORTED)
row != NULL && row_info != NULL &&
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
png_byte rc = png_ptr->rgb_to_gray_red_coeff;
png_byte gc = png_ptr->rgb_to_gray_green_coeff;
png_byte bc = png_ptr->rgb_to_gray_blue_coeff;
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
if (row_info->bit_depth == 8)
{
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_byte red = png_ptr->gamma_to_1[*(sp++)];
png_byte green = png_ptr->gamma_to_1[*(sp++)];
png_byte blue = png_ptr->gamma_to_1[*(sp++)];
if(red != green || red != blue)
{
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1[
(rc*red+gc*green+bc*blue)>>8];
}
else
*(dp++) = *(sp-1);
}
}
else
#endif
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_byte red = *(sp++);
png_byte green = *(sp++);
png_byte blue = *(sp++);
if(red != green || red != blue)
{
rgb_error |= 1;
*(dp++) = (rc*red+gc*green+bc*blue)>>8;
}
else
*(dp++) = *(sp-1);
}
}
}
else /* RGB bit_depth == 16 */
{
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
if (png_ptr->gamma_16_to_1 != NULL &&
png_ptr->gamma_16_from_1 != NULL)
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, w;
red = ((*(sp))<<8) | *(sp+1); sp+=2;
green = ((*(sp))<<8) | *(sp+1); sp+=2;
blue = ((*(sp))<<8) | *(sp+1); sp+=2;
if(red == green && red == blue)
w = red;
else
{
png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >>
png_ptr->gamma_shift][red>>8];
png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
png_ptr->gamma_shift][green>>8];
png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
png_ptr->gamma_shift][blue>>8];
png_uint_16 gray16 = (rc * red_1 + gc * green_1
+ bc * blue_1)>>8;
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
png_ptr->gamma_shift][gray16 >> 8];
rgb_error |= 1;
}
*(dp++) = (w>>8) & 0xff;
*(dp++) = w & 0xff;
}
}
else
#endif
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, gray16;
red = ((*(sp))<<8) | *(sp+1); sp+=2;
green = ((*(sp))<<8) | *(sp+1); sp+=2;
blue = ((*(sp))<<8) | *(sp+1); sp+=2;
if(red != green || red != blue)
rgb_error |= 1;
gray16 = (rc * red + gc * green + bc * blue)>>8;
*(dp++) = (gray16>>8) & 0xff;
*(dp++) = gray16 & 0xff;
}
}
}
}
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
if (row_info->bit_depth == 8)
{
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL)
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_byte red = png_ptr->gamma_to_1[*(sp++)];
png_byte green = png_ptr->gamma_to_1[*(sp++)];
png_byte blue = png_ptr->gamma_to_1[*(sp++)];
if(red != green || red != blue)
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1
[(rc*red + gc*green + bc*blue)>>8];
*(dp++) = *(sp++); /* alpha */
}
}
else
#endif
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_byte red = *(sp++);
png_byte green = *(sp++);
png_byte blue = *(sp++);
if(red != green || red != blue)
rgb_error |= 1;
*(dp++) = (gc*red + gc*green + bc*blue)>>8;
*(dp++) = *(sp++); /* alpha */
}
}
}
else /* RGBA bit_depth == 16 */
{
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
if (png_ptr->gamma_16_to_1 != NULL &&
png_ptr->gamma_16_from_1 != NULL)
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, w;
red = ((*(sp))<<8) | *(sp+1); sp+=2;
green = ((*(sp))<<8) | *(sp+1); sp+=2;
blue = ((*(sp))<<8) | *(sp+1); sp+=2;
if(red == green && red == blue)
w = red;
else
{
png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >>
png_ptr->gamma_shift][red>>8];
png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
png_ptr->gamma_shift][green>>8];
png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
png_ptr->gamma_shift][blue>>8];
png_uint_16 gray16 = (rc * red_1 + gc * green_1
+ bc * blue_1)>>8;
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
png_ptr->gamma_shift][gray16 >> 8];
rgb_error |= 1;
}
*(dp++) = (w>>8) & 0xff;
*(dp++) = w & 0xff;
*(dp++) = *(sp++); /* alpha */
*(dp++) = *(sp++);
}
}
else
#endif
{
png_bytep sp = row;
png_bytep dp = row;
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, gray16;
red = (*(sp)<<8) | *(sp+1); sp+=2;
green = (*(sp)<<8) | *(sp+1); sp+=2;
blue = (*(sp)<<8) | *(sp+1); sp+=2;
if(red != green || red != blue)
rgb_error |= 1;
gray16 = (rc * red + gc * green + bc * blue)>>8;
*(dp++) = (gray16>>8) & 0xff;
*(dp++) = gray16 & 0xff;
*(dp++) = *(sp++); /* alpha */
*(dp++) = *(sp++);
}
}
}
}
row_info->channels -= (png_byte)2;
row_info->color_type &= ~PNG_COLOR_MASK_COLOR;
row_info->pixel_depth = (png_byte)(row_info->channels *
row_info->bit_depth);
row_info->rowbytes = ((row_width *
row_info->pixel_depth + 7) >> 3);
}
return rgb_error;
}
#endif
/* Build a grayscale palette. Palette is assumed to be 1 << bit_depth /* Build a grayscale palette. Palette is assumed to be 1 << bit_depth
* large of png_color. This lets grayscale images be treated as * large of png_color. This lets grayscale images be treated as
* paletted. Most useful for gamma correction and simplification * paletted. Most useful for gamma correction and simplification
@ -1975,8 +2246,7 @@ png_correct_palette(png_structp png_ptr, png_colorp palette,
{ {
png_debug(1, "in png_correct_palette\n"); png_debug(1, "in png_correct_palette\n");
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) #if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
if ((png_ptr->transformations & (PNG_GAMMA)) && if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
(png_ptr->transformations & (PNG_BACKGROUND)))
{ {
png_color back, back_1; png_color back, back_1;
@ -3452,12 +3722,17 @@ void
png_build_gamma_table(png_structp png_ptr) png_build_gamma_table(png_structp png_ptr)
{ {
png_debug(1, "in png_build_gamma_table\n"); png_debug(1, "in png_build_gamma_table\n");
if(png_ptr->gamma != 0.0)
{
if (png_ptr->bit_depth <= 8) if (png_ptr->bit_depth <= 8)
{ {
int i; int i;
double g; double g;
if (png_ptr->screen_gamma > .000001)
g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
else
g = 1.0;
png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr, png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr,
(png_uint_32)256); (png_uint_32)256);
@ -3468,9 +3743,11 @@ png_build_gamma_table(png_structp png_ptr)
g) * 255.0 + .5); g) * 255.0 + .5);
} }
#if defined(PNG_READ_BACKGROUND_SUPPORTED) #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
if (png_ptr->transformations & PNG_BACKGROUND) defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
{ {
g = 1.0 / (png_ptr->gamma); g = 1.0 / (png_ptr->gamma);
png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr, png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr,
@ -3482,18 +3759,23 @@ png_build_gamma_table(png_structp png_ptr)
g) * 255.0 + .5); g) * 255.0 + .5);
} }
g = 1.0 / (png_ptr->screen_gamma);
png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr, png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
(png_uint_32)256); (png_uint_32)256);
if(png_ptr->screen_gamma > 0.000001)
g = 1.0 / png_ptr->screen_gamma;
else
g = png_ptr->gamma; /* probably doing rgb_to_gray */
for (i = 0; i < 256; i++) for (i = 0; i < 256; i++)
{ {
png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0, png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0,
g) * 255.0 + .5); g) * 255.0 + .5);
} }
} }
#endif /* PNG_BACKGROUND_SUPPORTED */ #endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
} }
else else
{ {
@ -3535,13 +3817,15 @@ png_build_gamma_table(png_structp png_ptr)
num = (1 << (8 - shift)); num = (1 << (8 - shift));
if (png_ptr->screen_gamma > .000001)
g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
else
g = 1.0;
png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr, png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
(png_uint_32)(num * sizeof (png_uint_16p))); (png_uint_32)(num * sizeof (png_uint_16p)));
if ((png_ptr->transformations & PNG_16_TO_8) && if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
!(png_ptr->transformations & PNG_BACKGROUND))
{ {
double fin, fout; double fin, fout;
png_uint_32 last, max; png_uint_32 last, max;
@ -3591,9 +3875,11 @@ png_build_gamma_table(png_structp png_ptr)
} }
} }
#if defined(PNG_READ_BACKGROUND_SUPPORTED) #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
if (png_ptr->transformations & PNG_BACKGROUND) defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
{ {
g = 1.0 / (png_ptr->gamma); g = 1.0 / (png_ptr->gamma);
png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr, png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
@ -3613,7 +3899,11 @@ png_build_gamma_table(png_structp png_ptr)
65535.0, g) * 65535.0 + .5); 65535.0, g) * 65535.0 + .5);
} }
} }
g = 1.0 / (png_ptr->screen_gamma);
if(png_ptr->screen_gamma > 0.000001)
g = 1.0 / png_ptr->screen_gamma;
else
g = png_ptr->gamma; /* probably doing rgb_to_gray */
png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr, png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
(png_uint_32)(num * sizeof (png_uint_16p))); (png_uint_32)(num * sizeof (png_uint_16p)));
@ -3633,7 +3923,8 @@ png_build_gamma_table(png_structp png_ptr)
} }
} }
} }
#endif /* PNG_BACKGROUND_SUPPORTED */ #endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
}
} }
} }
#endif #endif

135
pngrutil.c
View File

@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file /* pngrutil.c - utilities to read a PNG file
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -424,7 +424,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{ {
png_warning(png_ptr, png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present"); "Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_STDIO #ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "igamma = %lu\n", igamma); fprintf(stderr, "igamma = %lu\n", igamma);
#endif #endif
return; return;
@ -496,6 +496,9 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
else else
{ {
png_ptr->sig_bit.gray = buf[0]; png_ptr->sig_bit.gray = buf[0];
png_ptr->sig_bit.red = buf[0];
png_ptr->sig_bit.green = buf[0];
png_ptr->sig_bit.blue = buf[0];
png_ptr->sig_bit.alpha = buf[1]; png_ptr->sig_bit.alpha = buf[1];
} }
png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit)); png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
@ -624,7 +627,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_warning(png_ptr, png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present"); "Ignoring incorrect cHRM value when sRGB is also present");
#ifndef PNG_NO_STDIO #ifndef PNG_NO_CONSOLE_IO
fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n", fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
white_x, white_y, red_x, red_y); white_x, white_y, red_x, red_y);
fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n", fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
@ -693,7 +696,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{ {
png_warning(png_ptr, png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present"); "Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_STDIO #ifndef PNG_NO_CONSOLE_IO
fprintf(stderr,"gamma=%f\n",png_ptr->gamma); fprintf(stderr,"gamma=%f\n",png_ptr->gamma);
#endif #endif
} }
@ -1890,7 +1893,6 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
} }
#endif #endif
#ifndef PNG_READ_SLOW_FILTERING
void void
png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row, png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
png_bytep prev_row, int filter) png_bytep prev_row, int filter)
@ -2010,118 +2012,11 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
break; break;
} }
default: default:
png_error(png_ptr, "Bad adaptive filter type"); png_warning(png_ptr, "Ignoring bad adaptive filter type");
*row=0;
break; break;
} }
} }
#else /* PNG_READ_SLOW_FILTERING */
void
png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
png_bytep prev_row, int filter)
{
png_debug(1, "in png_read_filter_row\n");
png_debug2(2,"row = %d, filter = %d\n", png_ptr->row_number, filter);
switch (filter)
{
case PNG_FILTER_VALUE_NONE:
break;
case PNG_FILTER_VALUE_SUB:
{
png_uint_32 i;
int bpp = (row_info->pixel_depth + 7) / 8;
png_bytep rp;
png_bytep lp;
for (i = (png_uint_32)bpp, rp = row + bpp, lp = row;
i < row_info->rowbytes; i++, rp++, lp++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*lp)) & 0xff);
}
break;
}
case PNG_FILTER_VALUE_UP:
{
png_uint_32 i;
png_bytep rp;
png_bytep pp;
for (i = 0, rp = row, pp = prev_row;
i < row_info->rowbytes; i++, rp++, pp++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp)) & 0xff);
}
break;
}
case PNG_FILTER_VALUE_AVG:
{
png_uint_32 i;
int bpp = (row_info->pixel_depth + 7) / 8;
png_bytep rp;
png_bytep pp;
png_bytep lp;
for (i = 0, rp = row, pp = prev_row;
i < (png_uint_32)bpp; i++, rp++, pp++)
{
*rp = (png_byte)(((int)(*rp) +
((int)(*pp) / 2)) & 0xff);
}
for (lp = row; i < row_info->rowbytes; i++, rp++, lp++, pp++)
{
*rp = (png_byte)(((int)(*rp) +
(int)(*pp + *lp) / 2) & 0xff);
}
break;
}
case PNG_FILTER_VALUE_PAETH:
{
int bpp = (row_info->pixel_depth + 7) / 8;
png_uint_32 i;
png_bytep rp;
png_bytep pp;
png_bytep lp;
png_bytep cp;
for (i = 0, rp = row, pp = prev_row,
lp = row - bpp, cp = prev_row - bpp;
i < row_info->rowbytes; i++, rp++, pp++, lp++, cp++)
{
int a, b, c, pa, pb, pc, p;
b = *pp;
if (i >= (png_uint_32)bpp)
{
c = *cp;
a = *lp;
}
else
{
a = c = 0;
}
p = a + b - c;
pa = abs(p - a);
pb = abs(p - b);
pc = abs(p - c);
if (pa <= pb && pa <= pc)
p = a;
else if (pb <= pc)
p = b;
else
p = c;
*rp = (png_byte)(((int)(*rp) + p) & 0xff);
}
break;
}
default:
png_error(png_ptr, "Bad adaptive filter type");
break;
}
}
#endif /* PNG_READ_SLOW_FILTERING */
void void
png_read_finish_row(png_structp png_ptr) png_read_finish_row(png_structp png_ptr)
@ -2320,19 +2215,25 @@ png_read_start_row(png_structp png_ptr)
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
if (png_ptr->transformations & PNG_GRAY_TO_RGB) if (png_ptr->transformations & PNG_GRAY_TO_RGB)
{ {
if ((png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || if (
#if defined(PNG_READ_EXPAND_SUPPORTED)
(png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
#endif
#if defined(PNG_READ_FILLER_SUPPORTED)
(png_ptr->transformations & (PNG_FILLER)) ||
#endif
png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{ {
if (max_pixel_depth <= 16) if (max_pixel_depth <= 16)
max_pixel_depth = 32; max_pixel_depth = 32;
else if (max_pixel_depth <= 32) else
max_pixel_depth = 64; max_pixel_depth = 64;
} }
else else
{ {
if (max_pixel_depth <= 8) if (max_pixel_depth <= 8)
max_pixel_depth = 24; max_pixel_depth = 24;
else if (max_pixel_depth <= 16) else
max_pixel_depth = 48; max_pixel_depth = 48;
} }
} }

2
pngset.c
View File

@ -1,7 +1,7 @@
/* pngset.c - storage of image information into info struct /* pngset.c - storage of image information into info struct
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger

9
pngtest.c
View File

@ -1,7 +1,7 @@
/* pngtest.c - a simple test program to test libpng /* pngtest.c - a simple test program to test libpng
* *
* libpng 1.0.2 -June 14, 1998 * libpng 1.0.2a -December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -538,10 +538,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
fclose(fpout); fclose(fpout);
return (1); return (1);
} }
#ifdef USE_FAR_KEYWORD
png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
png_debug(0, "Setting jmpbuf for write struct\n"); png_debug(0, "Setting jmpbuf for write struct\n");
#ifdef USE_FAR_KEYWORD #ifdef USE_FAR_KEYWORD
png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
if (setjmp(jmpbuf)) if (setjmp(jmpbuf))
#else #else
if (setjmp(write_ptr->jmpbuf)) if (setjmp(write_ptr->jmpbuf))
@ -554,10 +556,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
fclose(fpout); fclose(fpout);
return (1); return (1);
} }
#ifdef USE_FAR_KEYWORD #ifdef USE_FAR_KEYWORD
png_memcpy(write_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); png_memcpy(write_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif #endif
png_debug(0, "Initializing input and output streams\n"); png_debug(0, "Initializing input and output streams\n");
#if !defined(PNG_NO_STDIO) #if !defined(PNG_NO_STDIO)
png_init_io(read_ptr, fpin); png_init_io(read_ptr, fpin);
@ -900,6 +902,7 @@ main(int argc, char *argv[])
fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING); fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
fprintf(STDERR, " with zlib version %s\n", ZLIB_VERSION); fprintf(STDERR, " with zlib version %s\n", ZLIB_VERSION);
fprintf(STDERR,"%s",png_get_copyright(NULL));
/* Do some consistency checking on the memory allocation settings, I'm /* Do some consistency checking on the memory allocation settings, I'm
not sure this matters, but it is nice to know, the first of these not sure this matters, but it is nice to know, the first of these

20
pngtrans.c
View File

@ -1,7 +1,7 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers) /* pngtrans.c - transforms the data in a row (used by both readers and writers)
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -99,6 +99,24 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
png_ptr->flags |= PNG_FLAG_FILLER_AFTER; png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
else else
png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
/* This should probably go in the "do_filler" routine.
* I attempted to do that in libpng-1.0.1a but that caused problems
* so I restored it in libpng-1.0.2a
*/
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
png_ptr->usr_channels = 4;
}
/* Also I added this in libpng-1.0.2a (what happens when we expand
* a less-than-8-bit grayscale to GA? */
if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
{
png_ptr->usr_channels = 2;
}
} }
#endif #endif

2
pngwio.c
View File

@ -1,7 +1,7 @@
/* pngwio.c - functions for data output /* pngwio.c - functions for data output
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger

2
pngwrite.c
View File

@ -1,7 +1,7 @@
/* pngwrite.c - general routines to write a PNG file /* pngwrite.c - general routines to write a PNG file
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger

10
pngwtran.c
View File

@ -1,7 +1,7 @@
/* pngwtran.c - transforms the data in a row for PNG writers /* pngwtran.c - transforms the data in a row for PNG writers
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger
@ -47,15 +47,15 @@ png_do_write_transformations(png_structp png_ptr)
png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
(png_uint_32)png_ptr->bit_depth); (png_uint_32)png_ptr->bit_depth);
#endif #endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED) #if defined(PNG_WRITE_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT) if (png_ptr->transformations & PNG_SHIFT)
png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
&(png_ptr->shift)); &(png_ptr->shift));
#endif #endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_ALPHA) if (png_ptr->transformations & PNG_INVERT_ALPHA)
png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);

2
pngwutil.c
View File

@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file /* pngwutil.c - utilities to write a PNG file
* *
* libpng 1.0.2 - June 14, 1998 * libpng 1.0.2a - December 29, 1998
* For conditions of distribution and use, see copyright notice in png.h * For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1996, 1997 Andreas Dilger

170
scripts/makefile.aco
View File

@ -49,173 +49,3 @@ Test: @.pngtest
# Dynamic dependencies: # Dynamic dependencies:
o.pngtest: c.pngtest
o.pngtest: h.png
o.pngtest: Zlib:h.zlib
o.pngtest: Zlib:h.zconf
o.pngtest: h.pngconf
mm.png: LibPng:c.png
mm.png: LibPng:h.png
mm.png: Zlib:h.zlib
mm.png: Zlib:h.zconf
mm.png: LibPng:h.pngconf
mm.png: MemCheck:ANSI.h.stdio
mm.pngerror: LibPng:c.pngerror
mm.pngerror: LibPng:h.png
mm.pngerror: Zlib:h.zlib
mm.pngerror: Zlib:h.zconf
mm.pngerror: LibPng:h.pngconf
mm.pngerror: MemCheck:ANSI.h.stdio
mm.pngrio: LibPng:c.pngrio
mm.pngrio: LibPng:h.png
mm.pngrio: Zlib:h.zlib
mm.pngrio: Zlib:h.zconf
mm.pngrio: LibPng:h.pngconf
mm.pngrio: MemCheck:ANSI.h.stdio
mm.pngwio: LibPng:c.pngwio
mm.pngwio: LibPng:h.png
mm.pngwio: Zlib:h.zlib
mm.pngwio: Zlib:h.zconf
mm.pngwio: LibPng:h.pngconf
mm.pngwio: MemCheck:ANSI.h.stdio
mm.pngmem: LibPng:c.pngmem
mm.pngmem: LibPng:h.png
mm.pngmem: Zlib:h.zlib
mm.pngmem: Zlib:h.zconf
mm.pngmem: LibPng:h.pngconf
mm.pngmem: MemCheck:ANSI.h.stdio
mm.pngpread: LibPng:c.pngpread
mm.pngpread: LibPng:h.png
mm.pngpread: Zlib:h.zlib
mm.pngpread: Zlib:h.zconf
mm.pngpread: LibPng:h.pngconf
mm.pngpread: MemCheck:ANSI.h.stdio
mm.pngset: LibPng:c.pngset
mm.pngset: LibPng:h.png
mm.pngset: Zlib:h.zlib
mm.pngset: Zlib:h.zconf
mm.pngset: LibPng:h.pngconf
mm.pngset: MemCheck:ANSI.h.stdio
mm.pngget: LibPng:c.pngget
mm.pngget: LibPng:h.png
mm.pngget: Zlib:h.zlib
mm.pngget: Zlib:h.zconf
mm.pngget: LibPng:h.pngconf
mm.pngget: MemCheck:ANSI.h.stdio
mm.pngread: LibPng:c.pngread
mm.pngread: LibPng:h.png
mm.pngread: Zlib:h.zlib
mm.pngread: Zlib:h.zconf
mm.pngread: LibPng:h.pngconf
mm.pngread: MemCheck:ANSI.h.stdio
mm.pngrtran: LibPng:c.pngrtran
mm.pngrtran: LibPng:h.png
mm.pngrtran: Zlib:h.zlib
mm.pngrtran: Zlib:h.zconf
mm.pngrtran: LibPng:h.pngconf
mm.pngrtran: MemCheck:ANSI.h.stdio
mm.pngrutil: LibPng:c.pngrutil
mm.pngrutil: LibPng:h.png
mm.pngrutil: Zlib:h.zlib
mm.pngrutil: Zlib:h.zconf
mm.pngrutil: LibPng:h.pngconf
mm.pngrutil: MemCheck:ANSI.h.stdio
mm.pngtrans: LibPng:c.pngtrans
mm.pngtrans: LibPng:h.png
mm.pngtrans: Zlib:h.zlib
mm.pngtrans: Zlib:h.zconf
mm.pngtrans: LibPng:h.pngconf
mm.pngtrans: MemCheck:ANSI.h.stdio
mm.pngwrite: LibPng:c.pngwrite
mm.pngwrite: LibPng:h.png
mm.pngwrite: Zlib:h.zlib
mm.pngwrite: Zlib:h.zconf
mm.pngwrite: LibPng:h.pngconf
mm.pngwrite: MemCheck:ANSI.h.stdio
mm.pngwtran: LibPng:c.pngwtran
mm.pngwtran: LibPng:h.png
mm.pngwtran: Zlib:h.zlib
mm.pngwtran: Zlib:h.zconf
mm.pngwtran: LibPng:h.pngconf
mm.pngwtran: MemCheck:ANSI.h.stdio
mm.pngwutil: LibPng:c.pngwutil
mm.pngwutil: LibPng:h.png
mm.pngwutil: Zlib:h.zlib
mm.pngwutil: Zlib:h.zconf
mm.pngwutil: LibPng:h.pngconf
mm.pngwutil: MemCheck:ANSI.h.stdio
o.png: c.png
o.png: h.png
o.png: Zlib:h.zlib
o.png: Zlib:h.zconf
o.png: h.pngconf
o.pngerror: c.pngerror
o.pngerror: h.png
o.pngerror: Zlib:h.zlib
o.pngerror: Zlib:h.zconf
o.pngerror: h.pngconf
o.pngrio: c.pngrio
o.pngrio: h.png
o.pngrio: Zlib:h.zlib
o.pngrio: Zlib:h.zconf
o.pngrio: h.pngconf
o.pngwio: c.pngwio
o.pngwio: h.png
o.pngwio: Zlib:h.zlib
o.pngwio: Zlib:h.zconf
o.pngwio: h.pngconf
o.pngmem: c.pngmem
o.pngmem: h.png
o.pngmem: Zlib:h.zlib
o.pngmem: Zlib:h.zconf
o.pngmem: h.pngconf
o.pngpread: c.pngpread
o.pngpread: h.png
o.pngpread: Zlib:h.zlib
o.pngpread: Zlib:h.zconf
o.pngpread: h.pngconf
o.pngset: c.pngset
o.pngset: h.png
o.pngset: Zlib:h.zlib
o.pngset: Zlib:h.zconf
o.pngset: h.pngconf
o.pngget: c.pngget
o.pngget: h.png
o.pngget: Zlib:h.zlib
o.pngget: Zlib:h.zconf
o.pngget: h.pngconf
o.pngread: c.pngread
o.pngread: h.png
o.pngread: Zlib:h.zlib
o.pngread: Zlib:h.zconf
o.pngread: h.pngconf
o.pngrtran: c.pngrtran
o.pngrtran: h.png
o.pngrtran: Zlib:h.zlib
o.pngrtran: Zlib:h.zconf
o.pngrtran: h.pngconf
o.pngrutil: c.pngrutil
o.pngrutil: h.png
o.pngrutil: Zlib:h.zlib
o.pngrutil: Zlib:h.zconf
o.pngrutil: h.pngconf
o.pngtrans: c.pngtrans
o.pngtrans: h.png
o.pngtrans: Zlib:h.zlib
o.pngtrans: Zlib:h.zconf
o.pngtrans: h.pngconf
o.pngwrite: c.pngwrite
o.pngwrite: h.png
o.pngwrite: Zlib:h.zlib
o.pngwrite: Zlib:h.zconf
o.pngwrite: h.pngconf
o.pngwtran: c.pngwtran
o.pngwtran: h.png
o.pngwtran: Zlib:h.zlib
o.pngwtran: Zlib:h.zconf
o.pngwtran: h.pngconf
o.pngwutil: c.pngwutil
o.pngwutil: h.png
o.pngwutil: Zlib:h.zlib
o.pngwutil: Zlib:h.zconf
o.pngwutil: h.pngconf

4
scripts/makefile.atr
View File

@ -9,6 +9,7 @@ LBR = png.lib
LDFLAGS=-lpng -lz -lm LDFLAGS=-lpng -lz -lm
# where make install puts libpng.a and png.h # where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = $(LBR)(png.o) $(LBR)(pngset.o) $(LBR)(pngget.o) $(LBR)(pngrutil.o)\ OBJS = $(LBR)(png.o) $(LBR)(pngset.o) $(LBR)(pngget.o) $(LBR)(pngrutil.o)\
$(LBR)(pngtrans.o) $(LBR)(pngwutil.o)\ $(LBR)(pngtrans.o) $(LBR)(pngwutil.o)\
@ -28,4 +29,5 @@ install: libpng.a
-@mkdir $(prefix)/lib -@mkdir $(prefix)/lib
cp png.h $(prefix)/include cp png.h $(prefix)/include
cp pngconf.h $(prefix)/include cp pngconf.h $(prefix)/include
chmod 644 $(prefix)/include/p chmod 644 $(prefix)/include/png.h
chmod 644 $(prefix)/include/pngconf.h

4
scripts/makefile.bor
View File

@ -100,7 +100,7 @@ LIBOBJS = \
+pngtrans.$(O) \ +pngtrans.$(O) \
+pngwrite.$(O) \ +pngwrite.$(O) \
+pngwtran.$(O) \ +pngwtran.$(O) \
+pngwio.$(O) +pngwio.$(O) \
+pngwutil.$(O) +pngwutil.$(O)
LIBNAME=libpng$(MODEL).lib LIBNAME=libpng$(MODEL).lib
@ -121,7 +121,7 @@ libpng: $(LIBNAME)
pngtest: pngtest$(MODEL).exe pngtest: pngtest$(MODEL).exe
test: test: pngtest$(MODEL).exe
pngtest$(MODEL) pngtest$(MODEL)

31
scripts/makefile.dec
View File

@ -2,12 +2,21 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib #ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include #ZLIBINC=/usr/local/include
ZLIBLIB=../zlib ZLIBLIB=../zlib
ZLIBINC=../zlib ZLIBINC=../zlib
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it.
PNGMAJ = 2
PNGMIN = 1.0.2a
PNGVER = $(PNGMAJ).$(PNGMIN)
CC=cc CC=cc
CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1 CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
@ -15,26 +24,33 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
#RANLIB=echo #RANLIB=echo
RANLIB=ranlib RANLIB=ranlib
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pngwtran.o pngmem.o pngerror.o pngpread.o
all: libpng.a pngtest all: libpng.so libpng.a pngtest
libpng.a: $(OBJS) libpng.a: $(OBJS)
ar rc $@ $(OBJS) ar rc $@ $(OBJS)
$(RANLIB) $@ $(RANLIB) $@
libpng.so: libpng.so.$(PNGMAJ)
ln -s -f libpng.so.$(PNGMAJ) libpng.so
libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
libpng.so.$(PNGVER): $(OBJS)
$(CC) -shared -o $@ $(OBJS) -L$(ZLIBLIB) -lz -lm
pngtest: pngtest.o libpng.a pngtest: pngtest.o libpng.a
$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS) $(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
test: pngtest test: pngtest
./pngtest ./pngtest
install: libpng.a install: libpng.a libpng.so.$(PNGVER)
-@mkdir $(prefix)/include -@mkdir $(prefix)/include
-@mkdir $(prefix)/lib -@mkdir $(prefix)/lib
cp png.h $(prefix)/include cp png.h $(prefix)/include
@ -42,10 +58,15 @@ install: libpng.a
chmod 644 $(prefix)/include/png.h chmod 644 $(prefix)/include/png.h
chmod 644 $(prefix)/include/pngconf.h chmod 644 $(prefix)/include/pngconf.h
cp libpng.a $(prefix)/lib cp libpng.a $(prefix)/lib
cp libpng.so.$(PNGVER) $(prefix)/lib
chmod 644 $(prefix)/lib/libpng.a chmod 644 $(prefix)/lib/libpng.a
chmod 644 $(prefix)/lib/libpng.so.$(PNGVER)
-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
(cd $(LIBPATH); ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
ln -s -f libpng.so.$(PNGMAJ) libpng.so)
clean: clean:
rm -f *.o libpng.a pngtest pngout.png rm -f *.o libpng.a pngtest pngout.png libpng.so*
# DO NOT DELETE THIS LINE -- make depend depends on it. # DO NOT DELETE THIS LINE -- make depend depends on it.

8
scripts/makefile.dj2
View File

@ -2,16 +2,16 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
#prefix=/usr/local
prefix=.
CC=gcc CC=gcc
CFLAGS=-I../zlib -O CFLAGS=-I../zlib -O
LDFLAGS=-L. -L../zlib/ -lpng -lz -lm LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
RANLIB=ranlib RANLIB=ranlib
# where make install puts libpng.a and png.h
#prefix=/usr/local
prefix=.
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ 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 \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o pngwtran.o \
pngmem.o pngerror.o pngpread.o pngmem.o pngerror.o pngpread.o

6
scripts/makefile.knr
View File

@ -2,6 +2,9 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
prefix=/usr/local
CC=cc CC=cc
CFLAGS=-I../zlib -O CFLAGS=-I../zlib -O
LDFLAGS=-L. -L../zlib/ -lpng -lz -lm LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
@ -11,9 +14,6 @@ ANSI2KNRFLAGS=
RANLIB=ranlib RANLIB=ranlib
#RANLIB=echo #RANLIB=echo
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pngwtran.o pngmem.o pngerror.o pngpread.o

17
scripts/makefile.lnx
View File

@ -5,6 +5,9 @@
CC=gcc CC=gcc
# where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib #ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include #ZLIBINC=/usr/local/include
@ -29,11 +32,9 @@ RANLIB=ranlib
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not # read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it. # have to change it.
PNGMAJ = 2 PNGMAJ = 2
PNGMIN = 1.0.2 PNGMIN = 1.0.2a
PNGVER = $(PNGMAJ).$(PNGMIN) PNGVER = $(PNGMAJ).$(PNGMIN)
# where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
INCPATH=$(prefix)/include INCPATH=$(prefix)/include
LIBPATH=$(prefix)/lib LIBPATH=$(prefix)/lib
@ -55,14 +56,14 @@ libpng.a: $(OBJS)
$(RANLIB) $@ $(RANLIB) $@
libpng.so: libpng.so.$(PNGMAJ) libpng.so: libpng.so.$(PNGMAJ)
ln -sf libpng.so.$(PNGMAJ) libpng.so ln -s -f libpng.so.$(PNGMAJ) libpng.so
libpng.so.$(PNGMAJ): libpng.so.$(PNGVER) libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ) ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
libpng.so.$(PNGVER): $(OBJSDLL) libpng.so.$(PNGVER): $(OBJSDLL)
$(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \ $(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
$(OBJSDLL) $(OBJSDLL) -L$(ZLIBLIB) -lz -lm -lc
pngtest: pngtest.o libpng.so pngtest: pngtest.o libpng.so
$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS) $(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
@ -77,8 +78,8 @@ install: libpng.a libpng.so.$(PNGVER)
cp libpng.a libpng.so.$(PNGVER) $(LIBPATH) cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
chmod 755 $(LIBPATH)/libpng.so.$(PNGVER) chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so -@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \ (cd $(LIBPATH); ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
ln -sf libpng.so.$(PNGMAJ) libpng.so) ln -s -f libpng.so.$(PNGMAJ) libpng.so)
clean: clean:
/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png /bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png

6
scripts/makefile.mip
View File

@ -2,6 +2,9 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
prefix=/usr/local
CC=cc CC=cc
CFLAGS=-I../zlib -O -systype sysv -DSYSV -w -Dmips CFLAGS=-I../zlib -O -systype sysv -DSYSV -w -Dmips
#CFLAGS=-O #CFLAGS=-O
@ -10,9 +13,6 @@ LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
#RANLIB=ranlib #RANLIB=ranlib
RANLIB=echo RANLIB=echo
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pngwtran.o pngmem.o pngerror.o pngpread.o

16
scripts/makefile.s2x
View File

@ -6,6 +6,9 @@
CC=gcc CC=gcc
# where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
# Changing these to ../zlib poses a security risk. If you want # Changing these to ../zlib poses a security risk. If you want
# to have zlib in an adjacent directory, specify the full path instead of "..". # to have zlib in an adjacent directory, specify the full path instead of "..".
@ -15,7 +18,6 @@ CC=gcc
ZLIBLIB=/usr/local/lib ZLIBLIB=/usr/local/lib
ZLIBINC=/usr/local/include ZLIBINC=/usr/local/include
WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
-Wmissing-declarations -Wtraditional -Wcast-align \ -Wmissing-declarations -Wtraditional -Wcast-align \
-Wstrict-prototypes -Wmissing-prototypes #-Wconversion -Wstrict-prototypes -Wmissing-prototypes #-Wconversion
@ -29,11 +31,9 @@ RANLIB=echo
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not # read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it. # have to change it.
PNGMAJ = 2 PNGMAJ = 2
PNGMIN = 1.0.2 PNGMIN = 1.0.2a
PNGVER = $(PNGMAJ).$(PNGMIN) PNGVER = $(PNGMAJ).$(PNGMIN)
# where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
INCPATH=$(prefix)/include INCPATH=$(prefix)/include
LIBPATH=$(prefix)/lib LIBPATH=$(prefix)/lib
@ -55,10 +55,10 @@ libpng.a: $(OBJS)
$(RANLIB) $@ $(RANLIB) $@
libpng.so: libpng.so.$(PNGMAJ) libpng.so: libpng.so.$(PNGMAJ)
ln -sf libpng.so.$(PNGMAJ) libpng.so ln -s -f libpng.so.$(PNGMAJ) libpng.so
libpng.so.$(PNGMAJ): libpng.so.$(PNGVER) libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ) ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
libpng.so.$(PNGVER): $(OBJSDLL) libpng.so.$(PNGVER): $(OBJSDLL)
$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \ $(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \
@ -77,8 +77,8 @@ install: libpng.a libpng.so.$(PNGVER)
cp libpng.a libpng.so.$(PNGVER) $(LIBPATH) cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
chmod 755 $(LIBPATH)/libpng.so.$(PNGVER) chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so -@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \ (cd $(LIBPATH); ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
ln -sf libpng.so.$(PNGMAJ) libpng.so) ln -s -f libpng.so.$(PNGMAJ) libpng.so)
clean: clean:
/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png /bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png

15
scripts/makefile.sco
View File

@ -7,6 +7,9 @@
CC=cc CC=cc
# where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib #ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include #ZLIBINC=/usr/local/include
@ -22,11 +25,9 @@ RANLIB=echo
# read libpng.txt or png.h to see why PNGMAJ is 2. You should not # read libpng.txt or png.h to see why PNGMAJ is 2. You should not
# have to change it. # have to change it.
PNGMAJ = 2 PNGMAJ = 2
PNGMIN = 1.0.2 PNGMIN = 1.0.2a
PNGVER = $(PNGMAJ).$(PNGMIN) PNGVER = $(PNGMAJ).$(PNGMIN)
# where make install puts libpng.a, libpng.so*, and png.h
prefix=/usr/local
INCPATH=$(prefix)/include INCPATH=$(prefix)/include
LIBPATH=$(prefix)/lib LIBPATH=$(prefix)/lib
@ -48,10 +49,10 @@ libpng.a: $(OBJS)
$(RANLIB) $@ $(RANLIB) $@
libpng.so: libpng.so.$(PNGMAJ) libpng.so: libpng.so.$(PNGMAJ)
ln -sf libpng.so.$(PNGMAJ) libpng.so ln -s -f libpng.so.$(PNGMAJ) libpng.so
libpng.so.$(PNGMAJ): libpng.so.$(PNGVER) libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ) ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
libpng.so.$(PNGVER): $(OBJSDLL) libpng.so.$(PNGVER): $(OBJSDLL)
$(CC) -G -Wl,-h,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \ $(CC) -G -Wl,-h,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
@ -70,8 +71,8 @@ install: libpng.a libpng.so.$(PNGVER)
cp libpng.a libpng.so.$(PNGVER) $(LIBPATH) cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
chmod 755 $(LIBPATH)/libpng.so.$(PNGVER) chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so -@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \ (cd $(LIBPATH); ln -s -f libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
ln -sf libpng.so.$(PNGMAJ) libpng.so) ln -s -f libpng.so.$(PNGMAJ) libpng.so)
clean: clean:
/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png /bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png

6
scripts/makefile.sgi
View File

@ -2,6 +2,9 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib #ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include #ZLIBINC=/usr/local/include
@ -17,9 +20,6 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
RANLIB=echo RANLIB=echo
#RANLIB=ranlib #RANLIB=ranlib
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pngwtran.o pngmem.o pngerror.o pngpread.o

6
scripts/makefile.std
View File

@ -2,6 +2,9 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib #ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include #ZLIBINC=/usr/local/include
@ -15,9 +18,6 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
#RANLIB=echo #RANLIB=echo
RANLIB=ranlib RANLIB=ranlib
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pngwtran.o pngmem.o pngerror.o pngpread.o

6
scripts/makefile.sun
View File

@ -2,6 +2,9 @@
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc. # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
# For conditions of distribution and use, see copyright notice in png.h # For conditions of distribution and use, see copyright notice in png.h
# where make install puts libpng.a and png.h
prefix=/usr/local
# Where the zlib library and include files are located # Where the zlib library and include files are located
#ZLIBLIB=/usr/local/lib #ZLIBLIB=/usr/local/lib
#ZLIBINC=/usr/local/include #ZLIBINC=/usr/local/include
@ -19,9 +22,6 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
RANLIB=ranlib RANLIB=ranlib
#RANLIB=echo #RANLIB=echo
# where make install puts libpng.a and png.h
prefix=/usr/local
OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \ OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \ pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
pngwtran.o pngmem.o pngerror.o pngpread.o pngwtran.o pngmem.o pngerror.o pngpread.o

2
scripts/makefile.w32
View File

@ -14,7 +14,7 @@ LDFLAGS=
O=.obj O=.obj
#uncomment next to put error messages in a file #uncomment next to put error messages in a file
ERRFILE= >> pngerrs #ERRFILE= >> pngerrs
# variables # variables
OBJS1 = png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O) OBJS1 = png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O)

10
scripts/pngdef.pas
View File

@ -3,7 +3,7 @@ unit pngdef;
interface interface
const const
PNG_LIBPNG_VER_STRING = '1.0.2'; PNG_LIBPNG_VER_STRING = '1.0.2a';
PNG_LIBPNG_VER = 10001; PNG_LIBPNG_VER = 10001;
type type
@ -259,6 +259,10 @@ function png_create_read_struct(user_png_ver: png_charp;
error_ptr: user_error_ptr; error_fn: png_error_ptr; error_ptr: user_error_ptr; error_fn: png_error_ptr;
warn_fn: png_error_ptr): png_structp; warn_fn: png_error_ptr): png_structp;
stdcall; stdcall;
function png_get_copyright(png_ptr: png_structp): png_charp;
stdcall;
function png_get_header_version(png_ptr: png_structp): png_charp;
stdcall;
function png_create_write_struct(user_png_ver: png_charp; function png_create_write_struct(user_png_ver: png_charp;
error_ptr: user_error_ptr; error_fn: png_error_ptr; error_ptr: user_error_ptr; error_fn: png_error_ptr;
warn_fn: png_error_ptr): png_structp; warn_fn: png_error_ptr): png_structp;
@ -343,6 +347,8 @@ function png_get_pixels_per_meter(png_ptr: png_structp;
stdcall; stdcall;
function png_get_progressive_ptr(png_ptr: png_structp): png_voidp; function png_get_progressive_ptr(png_ptr: png_structp): png_voidp;
stdcall; stdcall;
function png_get_rgb_to_gray_status(png_ptr: png_structp);
stdcall;
function png_get_rowbytes(png_ptr: png_structp; info_ptr: png_infop): function png_get_rowbytes(png_ptr: png_structp; info_ptr: png_infop):
png_uint_32; png_uint_32;
stdcall; stdcall;
@ -510,6 +516,8 @@ procedure png_set_read_status_fn(png_ptr: png_structp;
procedure png_set_read_user_transform_fn(png_ptr: png_structp; procedure png_set_read_user_transform_fn(png_ptr: png_structp;
read_user_transform_fn: png_user_transform_ptr); read_user_transform_fn: png_user_transform_ptr);
stdcall; stdcall;
procedure png_set_rgb_to_gray(png_ptr: png_structp; int: error_action);
stdcall;
procedure png_set_sBIT(png_ptr: png_structp; info_ptr: png_infop; procedure png_set_sBIT(png_ptr: png_structp; info_ptr: png_infop;
sig_bits: png_color_8p); sig_bits: png_color_8p);
stdcall; stdcall;

7
scripts/pngos2.def
View File

@ -29,7 +29,7 @@ EXPORTS
png_set_expand png_set_expand
png_set_bgr png_set_bgr
png_set_gray_to_rgb png_set_gray_to_rgb
; png_set_rgb_to_gray png_set_rgb_to_gray
png_build_grayscale_palette png_build_grayscale_palette
png_set_strip_alpha png_set_strip_alpha
png_set_swap_alpha png_set_swap_alpha
@ -72,8 +72,10 @@ EXPORTS
png_set_compression_window_bits png_set_compression_window_bits
png_set_compression_method png_set_compression_method
png_init_io png_init_io
png_get_copyright
png_set_error_fn png_set_error_fn
png_get_error_ptr png_get_error_ptr
png_get_header_version
; png_get_mem_fn ; png_get_mem_fn
; png_set_mem_fn ; png_set_mem_fn
png_set_write_fn png_set_write_fn
@ -112,6 +114,7 @@ EXPORTS
png_get_compression_type png_get_compression_type
png_get_pixels_per_meter png_get_pixels_per_meter
png_get_pixel_aspect_ratio png_get_pixel_aspect_ratio
png_get_rgb_to_gray_status
png_get_x_offset_pixels png_get_x_offset_pixels
png_get_y_offset_pixels png_get_y_offset_pixels
png_get_x_offset_microns png_get_x_offset_microns
@ -202,7 +205,7 @@ EXPORTS
png_do_strip_filler png_do_strip_filler
png_do_swap png_do_swap
png_do_packswap png_do_packswap
; png_do_rgb_to_gray png_do_rgb_to_gray
png_do_gray_to_rgb png_do_gray_to_rgb
png_do_unpack png_do_unpack
png_do_unshift png_do_unshift