Imported from libpng-0.99i.tar

CHANGES

@@ -1,4 +1,4 @@
-pngchange.txt - changes for libpng
+CHANGES - changes for libpng
 
 version 0.2
    added reader into png.h
@@ -244,3 +244,21 @@ version 0.99e [February 28, 1998]
    Replaced pngtest.png with one created with zlib 1.1.1
    Changed pngtest to report PASS even when file size is different (Jean-loup G.)
    Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
+version 0.99f [March 5, 1998]
+   Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
+   Moved makefiles into a "scripts" directory, and added INSTALL instruction file
+   Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
+   Added pointers to "note on libpng versions" in makefile.lnx and README
+   Added row callback feature when reading and writing nonprogressive rows
+      and added a test of this feature in pngtest.c
+   Added user transform callbacks, with test of the feature in pngtest.c
+version 0.99g [March 6, 1998, morning]
+   Minor changes to pngtest.c to suppress compiler warnings.
+   Removed "beta" language from documentation.
+version 0.99h [March 6, 1998, evening]
+   Minor changes to previous minor changes to pngtest.c 
+   Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
+   and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
+version 1.00 [March 7, 1998]
+   Changed several typedefs in pngrutil.c
+   Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)

INSTALL

@@ -0,0 +1,85 @@
+
+Installing libpng version 1.00 March 7, 1998
+
+Before installing libpng, you must first install zlib.  zlib
+can usually be found wherever you got libpng.  zlib can be
+placed in another directory, at the same level as libpng.
+Note that your system might already have a preinstalled
+zlib, but you will still need to have access to the 
+zlib.h and zconf.h include files that correspond to the
+version of zlib that's installed.
+
+You can rename the directories that you downloaded (they
+might be called "libpng-1.00 or "lpng100" and "zlib-1.1.1"
+or "zlib111") so that you have directories called "zlib" and "libpng".
+
+Your directory structure should look like this:
+
+   ..       (the parent directory)
+      libpng  (this directory)
+          INSTALL (this file)
+          README
+          *.h
+          *.c
+          scripts
+             makefile.*
+          pngtest.png
+          etc.
+      zlib
+          README
+          *.h
+          *.c
+          contrib
+          etc.
+
+First enter the zlib directory and follow the instructions
+in zlib/README.  Then come back here and choose the
+appropriate makefile.sys in the scripts directory.
+The files that are presently available in the scripts directory
+include
+
+      descrip.mms   =>  VMS makefile for MMS or MMK
+      makefile.std  =>  Generic UNIX makefile
+      makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
+      makefile.dec  =>  DEC Alpha UNIX makefile
+      makefile.sgi  =>  Silicon Graphics IRIX makefile
+      makefile.sun  =>  Sun makefile
+      makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.00)
+      makefile.lnx  =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.00)
+      makefile.mip  =>  MIPS makefile
+      makefile.aco  =>  Acorn makefile
+      makefile.ama  =>  Amiga makefile
+      makefile.atr  =>  Atari makefile
+      makefile.bor  =>  Borland makefile
+      build.bat     =>  MS-DOS batch file for Borland compiler
+      makefile.dj2  =>  DJGPP 2 makefile
+      makefile.msc  =>  Microsoft C makefile
+      makefile.tc3  =>  Turbo C 3.0 makefile
+      makefile.os2  =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
+      pngos2.def    =>  OS/2 module definition file used by makefile.os2
+      makefile.wat  =>  Watcom 10a+ Makefile, 32-bit flat memory model
+      makevms.com   =>  VMS build script
+
+Copy the file (or files) that you need from the
+scripts directory into this directory, for example
+
+   MSDOS example: copy scripts\makefile.msd makefile
+   UNIX example:    cp scripts/makefile.std makefile
+
+Read the makefile to see if you need to change any source or
+target directories to match your preferences.
+
+Then read pngconf.h to see if you want to make any configuration
+changes.
+
+Then just run "make test" which will create the libpng library in
+this directory and run a quick test that reads the "pngtest.png"
+file and writes a "pngout.png" file that should be identical to it.
+
+Most of the makefiles will allow you to run "make install" to
+put the library in its final resting place (if you want to
+do that, run "make install" in the zlib directory first if necessary).
+
+Further information can be found in the README and libpng.txt
+files, in the individual makefiles, and in png.h, and the manual
+pages libpng.3 and png.5.

README

@@ -1,8 +1,7 @@
-[NOTE:  this is still beta version 0.99e; the text below has already
+README for libpng 1.00 (shared library 2.1)
- been updated in anticipation of the imminent 1.0 release.]
+See the note about version numbers near the top of png.h
 
-
+See INSTALL for instructions on how to install libpng.
-README for libpng 1.0
 
 This is the first official release of libpng.  Don't let the fact that
 it's the first release fool you.  The libpng library has been in
@@ -117,7 +116,7 @@ and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.
 
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for a couple years now, and it is official and
+been discussing PNG for three years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used for version
 1.0, it may be used later.
@@ -135,21 +134,6 @@ Files in this distribution:
       libpng.3      =>  manual page for libpng
       libpng.txt    =>  Description of libpng and its functions
       libpngpf.3    =>  manual page for libpng's private functions
-      makefile.aco  =>  ACORN makefile
-      makefile.ama  =>  Amiga makefile
-      makefile.atr  =>  Atari makefile
-      makefile.bor  =>  Borland makefile
-      makefile.dec  =>  DEC makefile
-      makefile.dj2  =>  DJGPP 2 makefile
-      makefile.knr  =>  Makefile which calls ansi2knr to convert files
-      makefile.lnx  =>  Unix Linux/ELF makefile
-      makefile.mip  =>  MIPS makefile
-      makefile.msc  =>  Microsoft C makefile
-      makefile.sgi  =>  Silicon Graphics Irix makefile
-      makefile.std  =>  Standard Unix makefile
-      makefile.sun  =>  SUN makefile
-      makefile.tc3  =>  Turbo C 3.0 makefile
-      makevms.com   =>  VMS make program
       png.5         =>  manual page for the PNG format
       png.c         =>  Basic interface functions common to library
       png.h         =>  Library function and interface declarations
@@ -170,6 +154,28 @@ Files in this distribution:
       pngwrite.c    =>  High-level write functions
       pngwtran.c    =>  Write data transformations
       pngwutil.c    =>  Write utility functions
+      scripts       =>  Directory containing scripts for building libpng:
+        descrip.mms   =>  VMS makefile for MMS or MMK
+        makefile.std  =>  Generic UNIX makefile
+        makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
+        makefile.dec  =>  DEC Alpha UNIX makefile
+        makefile.sgi  =>  Silicon Graphics IRIX makefile
+        makefile.sun  =>  Sun makefile
+        makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.00)
+        makefile.lnx  =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.00)
+        makefile.mip  =>  MIPS makefile
+        makefile.aco  =>  Acorn makefile
+        makefile.ama  =>  Amiga makefile
+        makefile.atr  =>  Atari makefile
+        makefile.bor  =>  Borland makefile
+        build.bat     =>  MS-DOS batch file for Borland compiler
+        makefile.dj2  =>  DJGPP 2 makefile
+        makefile.msc  =>  Microsoft C makefile
+        makefile.tc3  =>  Turbo C 3.0 makefile
+        makefile.os2  =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
+        makefile.wat  =>  Watcom 10a+ Makefile, 32-bit flat memory model
+        pngos2.def    =>  OS/2 module definition file used by makefile.os2
+        makevms.com   =>  VMS build script
 
 Good luck, and happy coding.
 

TODO

@@ -1,4 +1,4 @@
-pngtodo.txt - list of things to do for libpng
+TODO - list of things to do for libpng
 
 add "grayscale->palette" transformation and "palette->grayscale" detection
 improved dithering

example.c

@@ -1,3 +1,4 @@
+
 /* example.c - an example of using libpng */
 
 /* This is an example of how to use libpng to read and write PNG files.

libpng.3

@@ -1,4 +1,4 @@
-.TH LIBPNG 3 "February 28, 1998"
+.TH LIBPNG 3 "March 7, 1998"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library
 .SH SYNOPSIS
@@ -301,6 +301,12 @@ png_colorp palette, int num_palette);
 void png_set_read_fn (png_structp png_ptr, png_voidp io_ptr,
 png_rw_ptr read_data_fn);
 
+void png_set_read_status_fn (png_structp png_ptr, png_read_status_ptr
+   read_row_fn);
+
+void png_set_read_user_transform_fn (png_structp png_ptr,
+   png_user_transform_ptr read_user_transform_fn);
+
 void png_set_rgb_to_gray (png_structp png_ptr);
 
 void png_set_sBIT (png_structp png_ptr, png_infop info_ptr,
@@ -337,6 +343,12 @@ png_bytep trans, int num_trans, png_color_16p trans_values);
 void png_set_write_fn (png_structp png_ptr, png_voidp io_ptr,
 png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn);
 
+void png_set_write_status_fn (png_structp png_ptr, png_write_status_ptr
+   write_row_fn);
+
+void png_set_write_user_transform_fn (png_structp png_ptr,
+   png_user_transform_ptr write_user_transform_fn);
+
 int png_sig_cmp (png_bytep sig, png_size_t start, png_size_t
 num_to_check);
 
@@ -384,23 +396,23 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 0.99e
+ libpng version 1.00 March 7, 1998
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alumni.rpi.edu>
  Copyright (c) 1998, Glenn Randers-Pehrson
- February 28, 1998
+ For conditions of distribution and use, see copyright
+ notice in png.h.
 
  based on:
 
- libpng 1.0 beta 6  version 0.96
+ libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger 
  Copyright (c) 1996, 1997 Andreas Dilger
- May 28, 1997
 
- libpng 1.0 beta 2 - version 0.88
+ libpng 1.0 beta 2 - version 0.88  January 26, 1996
  For conditions of distribution and use, see copyright
  notice in png.h. Copyright (c) 1995, 1996 Guy Eric
- Schalnat, Group 42, Inc.  January 26, 1996
+ Schalnat, Group 42, Inc.
 
  Updated/rewritten per request in the libpng FAQ
  Copyright (c) 1995 Frank J. T. Wojcik
@@ -414,7 +426,8 @@ file: introduction, structures, reading, writing, and modification and
 configuration notes for various special platforms.  In addition to this
 file, example.c is a good starting point for using the library, as
 it is heavily commented and should include everything most people
-will need.
+will need.  We assume that libpng is already installed; see the
+INSTALL file for instructions on how to install libpng.
 
 Libpng was written as a companion to the PNG specification, as a way
 of reducing the amount of time and effort it takes to support the PNG
@@ -586,6 +599,22 @@ libpng know that there are some bytes missing from the start of the file.
 
     png_set_sig_bytes(png_ptr, number);
 
+At this point, you can set up a callback function that will be
+called after each row has been read, which you can use to control
+a progress meter or the like.  It's demonstrated in pngtest.c.
+You must supply a function
+
+    void read_row_callback(png_ptr, png_uint_32 row, int pass);
+    {
+      /* put your code here */
+    }
+
+(You can give it another name that you like instead of "read_row_callback")
+
+To inform libpng about your function, use
+
+    png_set_read_status_fn(png_ptr, read_row_callback);
+
 In PNG files, the alpha channel in an image is the level of opacity.
 If you need the alpha channel in an image to be the level of transparency
 instead of opacity, you can invert the alpha channel (or the tRNS chunk
@@ -599,6 +628,21 @@ because the tRNS chunk data must be modified in the case of paletted images.
 If your image is not a paletted image, the tRNS data (which in such cases
 represents a single color to be rendered as transparent) won't be changed.
 
+Finally, you can write your own transformation function if none of
+the existing ones meets your needs.  This is done by setting a callback
+with
+
+    png_set_read_user_transform_fn(png_ptr,
+       read_transform_fn);
+
+You must supply the function
+
+    void read_transform_fn(png_ptr ptr, row_info_ptr
+       row_info, png_bytep data) 
+
+See pngtest.c for a working example.  Your function will be called
+after all of the other transformations have been processed.
+
 You are now ready to read all the file information up to the actual
 image data.  You do this with a call to png_read_info().
 
@@ -958,9 +1002,8 @@ the overall gamma correction required to produce pleasing results,
 which depends on the lighting conditions in the surrounding environment.
 Screen_gamma is display_gamma/viewing_gamma, where viewing_gamma is
 the amount of additional gamma correction needed to compensate for
-a dark (viewing_gamma=1.25) environment.
+a (viewing_gamma=1.25) environment.  In a dim or brightly lit room, no
-In a dim or brightly lit room, no compensation other than the display_gamma
+compensation other than the display_gamma is needed (viewing_gamma=1.0).
-is needed (viewing_gamma=1.0).
 
    if (/* We have a user-defined screen
        gamma value */)
@@ -1299,6 +1342,7 @@ png_infop info_ptr;
     read.
  */
  void
+ info_callback(png_structp png_ptr, png_infop info)
  {
     /* Do any setup here, including setting any of
        the transformations mentioned in the Reading
@@ -1368,8 +1412,6 @@ png_infop info_ptr;
      */
  }
 
-
-
 .SH IV. Writing
 
 Much of this is very similar to reading.  However, everything of
@@ -1390,7 +1432,10 @@ custom writing functions.  See the discussion under Customizing libpng.
 Next, png_struct and png_info need to be allocated and initialized.
 As these can be both relatively large, you may not want to store these
 on the stack, unless you have stack space to spare.  Of course, you
-will want to check if they return NULL.
+will want to check if they return NULL.  If you are also reading,
+you won't want to name your read structure and your write structure
+both "png_ptr"; you can call them anything you like, such as
+"read_ptr" and "write_ptr".  Look at pngtest.c, for example.
 
     png_structp png_ptr = png_create_write_struct
        (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
@@ -1433,6 +1478,22 @@ Libpng section below.
 
     png_init_io(png_ptr, fp);
 
+At this point, you can set up a callback function that will be
+called after each row has been written, which you can use to control
+a progress meter or the like.  It's demonstrated in pngtest.c.
+You must supply a function
+
+    void write_row_callback(png_ptr, png_uint_32 row, int pass);
+    {
+      /* put your code here */
+    }
+
+(You can give it another name that you like instead of "write_row_callback")
+
+To inform libpng about your function, use
+
+    png_set_write_status_fn(png_ptr, write_row_callback);
+
 You now have the option of modifying how the compression library will
 run.  The following functions are mainly for testing, but may be useful
 in some cases, like if you need to write PNG files extremely fast and
@@ -1789,6 +1850,21 @@ one. This code would be used if the pixels are supplied with this reversed
 
     png_set_invert_mono(png_ptr);
 
+Finally, you can write your own transformation function if none of
+the existing ones meets your needs.  This is done by setting a callback
+with
+
+    png_set_write_user_transform_fn(png_ptr,
+       write_transform_fn);
+
+You must supply the function
+
+    void write_transform_fn(png_ptr ptr, row_info_ptr
+       row_info, png_bytep data) 
+
+See pngtest.c for a working example.  Your function will be called
+before any of the other transformations have been processed.
+
 It is possible to have libpng flush any pending output, either manually,
 or automatically after a certain number of lines have been written.  To
 flush the output stream a single time call:
@@ -2143,15 +2219,18 @@ There are a bunch of #define's in pngconf.h that control what parts of
 libpng are compiled.  All the defines end in _SUPPORTED.  If you are
 never going to use an ability, you can change the #define to #undef
 before recompiling libpng and save yourself code and data space.
-You can also turn them off en masse with a compiler directive that
+You can also turn a number of them off en masse with a compiler directive
-defines PNG_READ[or WRITE]_NOT_FULLY_SUPPORTED, or
+that defines PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED, or
 PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED, or all four,
 along with directives to turn on any of the capabilities that you do
-want.  The NOT_FULLY_SUPPORTED directives disable the extra
+want.  The PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED directives disable
-transformations but still leave the library fully capable of reading
+the extra transformations but still leave the library fully capable of reading
 and writing PNG files with all known public chunks [except for sPLT].
 Use of the PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED directive
 produces a library that is incapable of reading or writing ancillary chunks.
+If you are not using the progressive reading capability, you can
+turn that off with PNG_PROGRESSIVE_READ_NOT_SUPPORTED (don't confuse
+this with the INTERLACING capability, which you'll still have).
 
 All the reading and writing specific code are in separate files, so the
 linker should only grab the files it needs.  However, if you want to
@@ -2227,9 +2306,7 @@ the first widely used release:
  0.97c                     0.97      2.0.97
  0.98                      0.98      2.0.98
  0.99                      0.99      2.0.99
- 0.99a                     0.99      2.0.99
+ 0.99a-g                   0.99      2.0.99
- 0.99b                     0.99      2.0.99
- 0.99e                     0.99      2.0.99
  1.0                       1.00      2.1.0
 
 Henceforth the source version will match the shared-library minor
@@ -2288,7 +2365,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
   
-Libpng version 0.99e (February 28, 1998):
+Libpng version 1.00 (March 7, 1998):
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).
 
@@ -2296,17 +2373,6 @@ Supported by the PNG development group
 .br
 (png-implement@dworkin.wustl.edu).
 
-.SH BETA NOTICE
-This is a beta version.  It reads and writes valid files on the
-platforms I have, and has had a wide testing program.  You may
-have to modify the includes in png.h to get it to work on your
-system, and you may have to supply the correct compiler flags in
-the makefile if you can't find a makefile suitable for your
-operating system/compiler combination.  Please contact the authors
-via the mailing list png-implement@dworkin.wustl.edu if you have any
-problems, or if you want your compiler/platform to be supported in
-the next official libpng release.
-
 .SH COPYRIGHT NOTICE:
 
 The PNG Reference Library (libpng) is supplied "AS IS".  The Contributing

libpng.txt

@@ -1,22 +1,22 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 0.99e
+ libpng version 1.00 March 7, 1998
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alumni.rpi.edu>
  Copyright (c) 1998, Glenn Randers-Pehrson
- February 28, 1998
+ For conditions of distribution and use, see copyright
+ notice in png.h.
 
  based on:
 
- libpng 1.0 beta 6  version 0.96
+ libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger 
  Copyright (c) 1996, 1997 Andreas Dilger
- May 28, 1997
 
- libpng 1.0 beta 2 - version 0.88
+ libpng 1.0 beta 2 - version 0.88  January 26, 1996
  For conditions of distribution and use, see copyright
  notice in png.h. Copyright (c) 1995, 1996 Guy Eric
- Schalnat, Group 42, Inc.  January 26, 1996
+ Schalnat, Group 42, Inc.
 
  Updated/rewritten per request in the libpng FAQ
  Copyright (c) 1995 Frank J. T. Wojcik
@@ -30,7 +30,8 @@ file: introduction, structures, reading, writing, and modification and
 configuration notes for various special platforms.  In addition to this
 file, example.c is a good starting point for using the library, as
 it is heavily commented and should include everything most people
-will need.
+will need.  We assume that libpng is already installed; see the
+INSTALL file for instructions on how to install libpng.
 
 Libpng was written as a companion to the PNG specification, as a way
 of reducing the amount of time and effort it takes to support the PNG
@@ -202,6 +203,22 @@ libpng know that there are some bytes missing from the start of the file.
 
     png_set_sig_bytes(png_ptr, number);
 
+At this point, you can set up a callback function that will be
+called after each row has been read, which you can use to control
+a progress meter or the like.  It's demonstrated in pngtest.c.
+You must supply a function
+
+    void read_row_callback(png_ptr, png_uint_32 row, int pass);
+    {
+      /* put your code here */
+    }
+
+(You can give it another name that you like instead of "read_row_callback")
+
+To inform libpng about your function, use
+
+    png_set_read_status_fn(png_ptr, read_row_callback);
+
 In PNG files, the alpha channel in an image is the level of opacity.
 If you need the alpha channel in an image to be the level of transparency
 instead of opacity, you can invert the alpha channel (or the tRNS chunk
@@ -215,6 +232,21 @@ because the tRNS chunk data must be modified in the case of paletted images.
 If your image is not a paletted image, the tRNS data (which in such cases
 represents a single color to be rendered as transparent) won't be changed.
 
+Finally, you can write your own transformation function if none of
+the existing ones meets your needs.  This is done by setting a callback
+with
+
+    png_set_read_user_transform_fn(png_ptr,
+       read_transform_fn);
+
+You must supply the function
+
+    void read_transform_fn(png_ptr ptr, row_info_ptr
+       row_info, png_bytep data) 
+
+See pngtest.c for a working example.  Your function will be called
+after all of the other transformations have been processed.
+
 You are now ready to read all the file information up to the actual
 image data.  You do this with a call to png_read_info().
 
@@ -914,6 +946,7 @@ png_infop info_ptr;
     read.
  */
  void
+ info_callback(png_structp png_ptr, png_infop info)
  {
     /* Do any setup here, including setting any of
        the transformations mentioned in the Reading
@@ -1005,7 +1038,10 @@ custom writing functions.  See the discussion under Customizing libpng.
 Next, png_struct and png_info need to be allocated and initialized.
 As these can be both relatively large, you may not want to store these
 on the stack, unless you have stack space to spare.  Of course, you
-will want to check if they return NULL.
+will want to check if they return NULL.  If you are also reading,
+you won't want to name your read structure and your write structure
+both "png_ptr"; you can call them anything you like, such as
+"read_ptr" and "write_ptr".  Look at pngtest.c, for example.
 
     png_structp png_ptr = png_create_write_struct
        (PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
@@ -1048,6 +1084,22 @@ Libpng section below.
 
     png_init_io(png_ptr, fp);
 
+At this point, you can set up a callback function that will be
+called after each row has been written, which you can use to control
+a progress meter or the like.  It's demonstrated in pngtest.c.
+You must supply a function
+
+    void write_row_callback(png_ptr, png_uint_32 row, int pass);
+    {
+      /* put your code here */
+    }
+
+(You can give it another name that you like instead of "write_row_callback")
+
+To inform libpng about your function, use
+
+    png_set_write_status_fn(png_ptr, write_row_callback);
+
 You now have the option of modifying how the compression library will
 run.  The following functions are mainly for testing, but may be useful
 in some cases, like if you need to write PNG files extremely fast and
@@ -1404,6 +1456,21 @@ one. This code would be used if the pixels are supplied with this reversed
 
     png_set_invert_mono(png_ptr);
 
+Finally, you can write your own transformation function if none of
+the existing ones meets your needs.  This is done by setting a callback
+with
+
+    png_set_write_user_transform_fn(png_ptr,
+       write_transform_fn);
+
+You must supply the function
+
+    void write_transform_fn(png_ptr ptr, row_info_ptr
+       row_info, png_bytep data) 
+
+See pngtest.c for a working example.  Your function will be called
+before any of the other transformations have been processed.
+
 It is possible to have libpng flush any pending output, either manually,
 or automatically after a certain number of lines have been written.  To
 flush the output stream a single time call:
@@ -1758,15 +1825,18 @@ There are a bunch of #define's in pngconf.h that control what parts of
 libpng are compiled.  All the defines end in _SUPPORTED.  If you are
 never going to use an ability, you can change the #define to #undef
 before recompiling libpng and save yourself code and data space.
-You can also turn them off en masse with a compiler directive that
+You can also turn a number of them off en masse with a compiler directive
-defines PNG_READ[or WRITE]_NOT_FULLY_SUPPORTED, or
+that defines PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED, or
 PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED, or all four,
 along with directives to turn on any of the capabilities that you do
-want.  The NOT_FULLY_SUPPORTED directives disable the extra
+want.  The PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED directives disable
-transformations but still leave the library fully capable of reading
+the extra transformations but still leave the library fully capable of reading
 and writing PNG files with all known public chunks [except for sPLT].
 Use of the PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED directive
 produces a library that is incapable of reading or writing ancillary chunks.
+If you are not using the progressive reading capability, you can
+turn that off with PNG_PROGRESSIVE_READ_NOT_SUPPORTED (don't confuse
+this with the INTERLACING capability, which you'll still have).
 
 All the reading and writing specific code are in separate files, so the
 linker should only grab the files it needs.  However, if you want to

libpngpf.3

@@ -1,4 +1,4 @@
-.TH LIBPNGPF 3 "February 28, 1998"
+.TH LIBPNGPF 3 "March 7, 1998"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library
 (private functions)

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "February 28, 1998"
+.TH PNG 5 "March 7, 1998"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

@@ -1,12 +1,12 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 #define PNG_INTERNAL
@@ -16,7 +16,7 @@
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
  */
-char png_libpng_ver[5] = "0.99";
+char png_libpng_ver[5] = "1.00";
 
 /* Place to hold the signature string for a PNG file. */
 png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -185,7 +185,7 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
    }
 
    if (need_crc)
-      png_ptr->crc = crc32(png_ptr->crc, ptr, length);
+      png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
 }
 
 /* Allocate the memory for an info_struct for the application.  We don't

png.h

@@ -1,12 +1,12 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng 0.99e beta
+ * libpng 1.00
  * For conditions of distribution and use, see the COPYRIGHT NOTICE below.
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998 Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * Note about libpng version numbers:
  *
@@ -27,27 +27,13 @@
  *      0.97c                     0.97      2.0.97
  *      0.98                      0.98      2.0.98
  *      0.99                      0.99      2.0.99
- *      0.99a                     0.99      2.0.99
+ *      0.99a-i                   0.99      2.0.99
- *      0.99b                     0.99      2.0.99
+ *      1.00                      1.00      2.1.0
- *      0.99c                     0.99      2.0.99
- *      0.99e                     0.99      2.0.99
- *      1.0                       1.00      2.1.0
  *
  *    Henceforth the source version will match the shared-library minor
  *    and patch numbers; the shared-library major version number will be
  *    used for changes in backward compatibility, as it is intended.
  *
- * BETA NOTICE:
- *    This is a beta version.  It reads and writes valid files on the
- *    platforms I have, and has had a wide testing program.  You may
- *    have to modify the includes below to get it to work on your
- *    system, and you may have to supply the correct compiler flags in
- *    the makefile if you can't find a makefile suitable for your
- *    operating system/compiler combination.  Read libpng.txt for more
- *    information, including how to contact the authors if you have any
- *    problems, or if you want your compiler/platform to be supported in
- *    the next official libpng release.
- *
  * See libpng.txt for more information.  The PNG specification is available
  * as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
  * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
@@ -126,12 +112,12 @@ extern "C" {
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "0.99"
+#define PNG_LIBPNG_VER_STRING "1.00"
 
 /* careful here.  At one time, I wanted to use 082, but that would be octal.
  * Version 1.0 will be 100 here, etc.
  */
-#define PNG_LIBPNG_VER  99
+#define PNG_LIBPNG_VER  100
 
 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
@@ -508,6 +494,8 @@ typedef png_struct FAR * png_structp;
 typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp));
 typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
 typedef void (*png_flush_ptr) PNGARG((png_structp));
+typedef void (*png_read_status_ptr) PNGARG((png_structp, png_uint_32, int));
+typedef void (*png_write_status_ptr) PNGARG((png_structp, png_uint_32, int));
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop));
 typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop));
@@ -515,6 +503,12 @@ typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
    png_uint_32, int));
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+typedef void (*png_user_transform_ptr) PNGARG((png_structp,
+    png_row_infop, png_bytep));
+#endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */
+
 /* The structure that holds the information to read and write PNG files.
  * The only people who need to care about what is inside of this are the
  * people who will be modifying the library for their own special needs.
@@ -531,9 +525,14 @@ struct png_struct_def
    png_voidp error_ptr;       /* user supplied struct for error functions */
    png_rw_ptr write_data_fn;  /* function for writing output data */
    png_rw_ptr read_data_fn;   /* function for reading input data */
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   png_user_transform_ptr read_user_transform_fn; /* user read transform */
+   png_user_transform_ptr write_user_transform_fn; /* user write transform */
+#endif
    png_voidp io_ptr;          /* ptr to application struct for I/O functions*/
 
-   png_uint_32 mode;          /* tells us whre we are in the PNG file */
+   png_uint_32 mode;          /* tells us where we are in the PNG file */
    png_uint_32 flags;         /* flags indicating various things to libpng */
    png_uint_32 transformations; /* which transformations to perform */
 
@@ -620,9 +619,11 @@ struct png_struct_def
    png_bytep trans;           /* transparency values for paletted files */
    png_color_16 trans_values; /* transparency values for non-paletted files */
 #endif /* PNG_READ_tRNS_SUPPORTED || PNG_READ_BACKGROUND_SUPPORTED */
+   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
+   png_write_status_ptr write_row_fn; /* called after each row is encoded */
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
    png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after each row is decoded */
+   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
    png_progressive_end_ptr end_fn;   /* called after image is complete */
    png_bytep save_buffer_ptr;        /* current location in save_buffer */
    png_bytep save_buffer;            /* buffer for previously read data */
@@ -1096,6 +1097,22 @@ extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
 /* Return the user pointer associated with the I/O functions */
 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
 
+extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
+   png_read_status_ptr read_row_fn));
+
+extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
+   png_write_status_ptr write_row_fn));
+
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
+   png_ptr, png_user_transform_ptr read_user_transform_fn));
+#endif
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
+   png_ptr, png_user_transform_ptr write_user_transform_fn));
+#endif
+
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 /* Sets the function callbacks for the push reader, and a pointer to a
  * user-defined structure available to the callback functions.
@@ -1470,6 +1487,7 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
 #define PNG_SWAP_ALPHA        0x20000L
 #define PNG_STRIP_ALPHA       0x40000L
 #define PNG_INVERT_ALPHA      0x80000L
+#define PNG_USER_TRANSFORM   0x100000L
 
 /* flags for png_create_struct */
 #define PNG_STRUCT_PNG   0x0001

pngconf.h

@@ -1,12 +1,12 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 /* Any machine specific code is near the front of this file, so if you
@@ -236,21 +236,24 @@ __dont__ include it again
 
 /* Any transformations you will not be using can be undef'ed here */
 
-/* GR-P, 0.96a: Set "*FULLY_SUPPORTED as default but allow user
+/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
-   to turn it off with "*NOT_FULLY_SUPPORTED" on the compile line,
+   to turn it off with "*TRANSFORMS_NOT_SUPPORTED" on the compile line,
    then pick and choose which ones to define without having to edit
-   this file.
+   this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED if you
+   only want to have a png-compliant reader/writer but don't need
+   any of the extra transformations.  This saves about 80 kbytes in a
+   typical installation of the library.
  */
 
-#ifndef PNG_READ_NOT_FULLY_SUPPORTED
+
-#define PNG_READ_FULLY_SUPPORTED
+#ifndef PNG_READ_TRANSFORMS_NOT_SUPPORTED
+#define PNG_READ_TRANSFORMS_SUPPORTED
 #endif
-#ifndef PNG_WRITE_NOT_FULLY_SUPPORTED
+#ifndef PNG_WRITE_TRANSFORMS_NOT_SUPPORTED
-#define PNG_WRITE_FULLY_SUPPORTED
+#define PNG_WRITE_TRANSFORMS_SUPPORTED
 #endif
 
-#ifdef PNG_READ_FULLY_SUPPORTED
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-#define PNG_PROGRESSIVE_READ_SUPPORTED
 #define PNG_READ_EXPAND_SUPPORTED
 #define PNG_READ_SHIFT_SUPPORTED
 #define PNG_READ_PACK_SUPPORTED
@@ -267,12 +270,20 @@ __dont__ include it again
 #define PNG_READ_SWAP_ALPHA_SUPPORTED
 #define PNG_READ_INVERT_ALPHA_SUPPORTED
 #define PNG_READ_STRIP_ALPHA_SUPPORTED
-#define PNG_READ_COMPOSITE_NODIV_SUPPORTED        /* well tested on Intel */
+#define PNG_READ_USER_TRANSFORM_SUPPORTED
-#endif /* PNG_READ_FULLY_SUPPORTED */
+/* the following aren't implemented yet
+#define PNG_READ_RGB_TO_GRAY_SUPPORTED
+ */
+#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 
-#define PNG_READ_INTERLACING_SUPPORTED  /* required for PNG-compliant decoders */
+#ifndef PNG_PROGRESSIVE_READ_NOT_SUPPORTED   /* if you don't do progressive   */
+#define PNG_PROGRESSIVE_READ_SUPPORTED       /* reading.  This is not talking */
+#endif                               /* about interlacing capability!  You'll */
+              /* still have interlacing unless you change the following line: */
+#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
+#define PNG_READ_COMPOSITE_NODIV_SUPPORTED    /* well tested on Intel and SGI */
 
-#ifdef PNG_WRITE_FULLY_SUPPORTED
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
 #define PNG_WRITE_SHIFT_SUPPORTED
 #define PNG_WRITE_PACK_SUPPORTED
 #define PNG_WRITE_BGR_SUPPORTED
@@ -284,10 +295,11 @@ __dont__ include it again
 #define PNG_WRITE_SWAP_ALPHA_SUPPORTED
 #define PNG_WRITE_INVERT_ALPHA_SUPPORTED
 #define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-#endif /* PNG_WRITE_FULLY_SUPPORTED */
+#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
 
-#define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant */
+#define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
-                                         /* encoders, but can cause trouble
+                                            encoders, but can cause trouble
                                             if left undefined */
 
 #if !defined(PNG_NO_STDIO)

pngerror.c

@@ -1,12 +1,12 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file provides a location for all error handling.  Users which
  * need special error handling are expected to write replacement functions

pngget.c

@@ -1,12 +1,12 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 #define PNG_INTERNAL

pngmem.c

@@ -1,11 +1,12 @@
+
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file provides a location for all memory allocation.  Users which
  * need special memory handling are expected to modify the code in this file

pngpread.c

@@ -1,12 +1,12 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 #define PNG_INTERNAL
@@ -785,7 +785,10 @@ png_read_push_finish_row(png_structp png_ptr)
             png_pass_inc[png_ptr->pass] - 1 -
             png_pass_start[png_ptr->pass]) /
             png_pass_inc[png_ptr->pass];
-         png_ptr->irowbytes = ((png_ptr->pixel_depth + 7) >> 3) + 1;
+
+         png_ptr->irowbytes = ((png_ptr->iwidth *
+            png_ptr->pixel_depth + 7) >> 3) + 1;
+
          if (!(png_ptr->transformations & PNG_INTERLACE))
          {
             png_ptr->num_rows = (png_ptr->height +
@@ -978,7 +981,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
       png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
          (text - key));
       png_ptr->zstream.next_out = png_ptr->zbuf;
-      png_ptr->zstream.avail_out = png_ptr->zbuf_size;
+      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 
       key_size = text - key;
       text_size = 0;

pngread.c

@@ -1,12 +1,12 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
@@ -449,6 +449,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
          png_combine_row(png_ptr, dsp_row, 0xff);
    }
    png_read_finish_row(png_ptr);
+
+   if (png_ptr->read_row_fn != NULL)
+      (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
 
 /* Read one or more rows of image data.  If the image is interlaced,
@@ -778,3 +781,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
 }
+
+void
+png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
+{
+   png_ptr->read_row_fn = read_row_fn;
+}

pngrio.c

@@ -1,12 +1,12 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file provides a location for all input.  Users which need
  * special handling are expected to write a function which has the same

pngrtran.c

@@ -1,12 +1,12 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file contains functions optionally called by an application 
  * in order to tell libpng how to handle data when reading a PNG.
@@ -600,6 +600,17 @@ png_set_rgb_to_gray(png_structp png_ptr, int gray_bits)
 }
 #endif
 
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+void
+png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
+   read_user_transform_fn)
+{
+   png_debug(1, "in png_set_read_user_transform_fn\n");
+   png_ptr->transformations |= PNG_USER_TRANSFORM;
+   png_ptr->read_user_transform_fn = read_user_transform_fn;
+}
+#endif
+
 /* Initialize everything needed for the read.  This includes modifying
  * the palette.
  */
@@ -1078,7 +1089,7 @@ png_do_read_transformations(png_structp png_ptr)
          png_ptr->gamma_shift);
 #endif
 
-#if defined(PNG_RGB_TO_GRAY_SUPPORTED)
+#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
@@ -1149,6 +1160,22 @@ png_do_read_transformations(png_structp png_ptr)
    if (png_ptr->transformations & PNG_SWAP_BYTES)
       png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+      if(png_ptr->read_user_transform_fn != NULL)
+        (*(png_ptr->read_user_transform_fn)) /* user read transform function */
+          (png_ptr,                    /* png_ptr */
+           &(png_ptr->row_info),       /* row_info:     */
+             /*  png_uint_32 width;          width of row */
+             /*  png_uint_32 rowbytes;       number of bytes in row */
+             /*  png_byte color_type;        color type of pixels */
+             /*  png_byte bit_depth;         bit depth of samples */
+             /*  png_byte channels;          number of channels (1-4) */
+             /*  png_byte pixel_depth;       bits per pixel (depth*channels) */
+           png_ptr->row_buf + 1);      /* start of pixel data for row */
+#endif
+
 }
 
 #if defined(PNG_READ_PACK_SUPPORTED)

pngrutil.c

@@ -6,7 +6,7 @@
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file contains routines which are only called from within
  * libpng itself during the course of reading an image.
@@ -1305,7 +1305,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       png_ptr->zstream.next_in = (png_bytep)text;
       png_ptr->zstream.avail_in = (uInt)(length - (text - key));
       png_ptr->zstream.next_out = png_ptr->zbuf;
-      png_ptr->zstream.avail_out = png_ptr->zbuf_size;
+      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 
       key_size = (png_size_t)(text - key);
       text_size = 0;
@@ -1704,7 +1704,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
          case 1:
          {
             png_bytep sp, dp;
-            int sshift, dshift;
+            png_uint_32 sshift, dshift;
             int s_start, s_end, s_inc;
             png_byte v;
             png_uint_32 i;
@@ -1715,8 +1715,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
             if (transformations & PNG_PACKSWAP)
             {
-                sshift = (int)((row_info->width + 7) & 7);
+                sshift = (png_uint_32)((row_info->width + 7) & 7);
-                dshift = (int)((final_width + 7) & 7);
+                dshift = (png_uint_32)((final_width + 7) & 7);
                 s_start = 7;
                 s_end = 0;
                 s_inc = -1;
@@ -1724,8 +1724,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
             else
 #endif
             {
-                sshift = 7 - (int)((row_info->width + 7) & 7);
+                sshift = 7 - (png_uint_32)((row_info->width + 7) & 7);
-                dshift = 7 - (int)((final_width + 7) & 7);
+                dshift = 7 - (png_uint_32)((final_width + 7) & 7);
                 s_start = 0;
                 s_end = 7;
                 s_inc = 1;
@@ -1759,17 +1759,17 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
          case 2:
          {
             png_bytep sp, dp;
-            int sshift, dshift;
+            png_uint_32 sshift, dshift;
             int s_start, s_end, s_inc;
             png_uint_32 i;
 
-            sp = row + (png_size_t)((row_info->width - 1) >> 2);
+            sp = row + (png_uint_32)((row_info->width - 1) >> 2);
-            dp = row + (png_size_t)((final_width - 1) >> 2);
+            dp = row + (png_uint_32)((final_width - 1) >> 2);
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
             if (transformations & PNG_PACKSWAP)
             {
-               sshift = (png_size_t)(((row_info->width + 3) & 3) << 1);
+               sshift = (png_uint_32)(((row_info->width + 3) & 3) << 1);
-               dshift = (png_size_t)(((final_width + 3) & 3) << 1);
+               dshift = (png_uint_32)(((final_width + 3) & 3) << 1);
                s_start = 6;
                s_end = 0;
                s_inc = -2;
@@ -1777,8 +1777,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
             else
 #endif
             {
-               sshift = (png_size_t)((3 - ((row_info->width + 3) & 3)) << 1);
+               sshift = (png_uint_32)((3 - ((row_info->width + 3) & 3)) << 1);
-               dshift = (png_size_t)((3 - ((final_width + 3) & 3)) << 1);
+               dshift = (png_uint_32)((3 - ((final_width + 3) & 3)) << 1);
                s_start = 0;
                s_end = 6;
                s_inc = 2;
@@ -1815,7 +1815,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
          case 4:
          {
             png_bytep sp, dp;
-            int sshift, dshift;
+            png_uint_32 sshift, dshift;
             int s_start, s_end, s_inc;
             png_uint_32 i;
 
@@ -1824,8 +1824,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
             if (transformations & PNG_PACKSWAP)
             {
-               sshift = (png_size_t)(((row_info->width + 1) & 1) << 2);
+               sshift = (png_uint_32)(((row_info->width + 1) & 1) << 2);
-               dshift = (png_size_t)(((final_width + 1) & 1) << 2);
+               dshift = (png_uint_32)(((final_width + 1) & 1) << 2);
                s_start = 4;
                s_end = 0;
                s_inc = -4;
@@ -1833,8 +1833,8 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
             else
 #endif
             {
-               sshift = (png_size_t)((1 - ((row_info->width + 1) & 1)) << 2);
+               sshift = (png_uint_32)((1 - ((row_info->width + 1) & 1)) << 2);
-               dshift = (png_size_t)((1 - ((final_width + 1) & 1)) << 2);
+               dshift = (png_uint_32)((1 - ((final_width + 1) & 1)) << 2);
                s_start = 0;
                s_end = 4;
                s_inc = 4;

pngset.c

@@ -1,12 +1,12 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * The functions here are used during reads to store data from the file
  * into the info struct, and during writes to store application data

pngtest.c

@@ -1,12 +1,12 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This program reads in a PNG image, writes it out again, and then
  * compares the two files.  If the files are identical, this shows that
@@ -32,8 +32,8 @@
 
 /* Makes pngtest verbose so we can find problems (needs to be before png.h) */
 #ifndef PNG_DEBUG
-#define PNG_DEBUG 0
 #endif
+#define PNG_DEBUG 0
 
 #include "png.h"
 
@@ -47,6 +47,126 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname);
 /*  #define STDERR stderr  */
 #define STDERR stdout   /* for DOS */
 
+/* example of using row callbacks to make a simple progress meter */
+static int status_pass=1;
+static int status_dots_requested=0;
+static int status_dots=1;
+void read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
+void read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
+{
+    if(png_ptr == NULL || row_number > 0x3fffffff) return;
+    if(status_pass != pass)
+    {
+       fprintf(stdout,"\n Pass %d: ",pass);
+       status_pass = pass;
+       status_dots = 30;
+    }
+    status_dots--;
+    if(status_dots == 0)
+    {
+       fprintf(stdout, "\n         ");
+       status_dots=30;
+    }
+    fprintf(stdout, "r");
+}
+void write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
+void write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
+{
+    if(png_ptr == NULL || row_number > 0x3fffffff || pass > 7) return;
+    fprintf(stdout, "w");
+}
+
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+/* example of using user transform callback (we don't transform anything,
+   but merely count the black pixels) */
+
+static png_uint_32 black_pixels;
+void count_black_pixels(png_structp png_ptr, png_row_infop row_info,
+   png_bytep data);
+void count_black_pixels(png_structp png_ptr, png_row_infop row_info,
+   png_bytep data)
+{
+   png_bytep dp = data;
+   if(png_ptr == NULL)return; 
+
+   /* contents of row_info:
+    *  png_uint_32 width      width of row
+    *  png_uint_32 rowbytes   number of bytes in row
+    *  png_byte color_type    color type of pixels
+    *  png_byte bit_depth     bit depth of samples
+    *  png_byte channels      number of channels (1-4)
+    *  png_byte pixel_depth   bits per pixel (depth*channels)
+    */
+
+    /* counts the number of black pixels (or zero pixels if color_type is 3 */
+
+    if(row_info->color_type == 0 || row_info->color_type == 3)
+    {
+       int pos=0;
+       png_uint_32 n;
+       for (n=0; n<(int)row_info->width; n++)
+       {
+          if(row_info->bit_depth == 1)
+             if(((*dp << pos++ )& 0x80) == 0) black_pixels++;
+             if(pos == 8)
+             {
+                pos=0;
+                dp++;
+             }
+          if(row_info->bit_depth == 2)
+             if(((*dp << (pos+=2))& 0xc0) == 0) black_pixels++;
+             if(pos == 8)
+             {
+                pos=0;
+                dp++;
+             }
+          if(row_info->bit_depth == 4)
+             if(((*dp << (pos+=4))& 0xf0) == 0) black_pixels++;
+             if(pos == 8)
+             {
+                pos=0;
+                dp++;
+             }
+          if(row_info->bit_depth == 8)
+             if(*dp++ == 0) black_pixels++;
+          if(row_info->bit_depth == 16)
+          {
+             if((*dp | *(dp+1)) == 0) black_pixels++;
+             dp+=2;
+          }
+       }
+    }
+    else /* other color types */
+    {
+       png_uint_32 n;
+       int channel;
+       int color_channels = row_info->channels;
+       if(row_info->color_type > 3)color_channels--;
+
+       for (n=0; n<row_info->width; n++)
+       {
+          for (channel = 0; channel < color_channels; channel++)
+          {
+             if(row_info->bit_depth == 8)
+                if(*dp++ == 0) black_pixels++;
+             if(row_info->bit_depth == 16)
+             {
+                if((*dp | *(dp+1)) == 0) black_pixels++;
+                dp+=2;
+             }
+          }
+          if(row_info->color_type > 3)
+          {
+             dp++;
+             if(row_info->bit_depth == 16)dp++;
+          }
+       }
+    }
+}
+#endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */
+
 static int verbose = 0;
 static int wrote_question = 0;
 
@@ -439,6 +559,22 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #else
       NULL);
 #endif
+#endif
+   if(status_dots_requested == 1)
+   {
+      png_set_write_status_fn(write_ptr, write_row_callback);
+      png_set_read_status_fn(read_ptr, read_row_callback);
+   }
+   else
+   {
+      png_set_write_status_fn(write_ptr, NULL);
+      png_set_read_status_fn(read_ptr, NULL);
+   }
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   black_pixels=0;
+   png_set_write_user_transform_fn(write_ptr, count_black_pixels);
 #endif
 
    png_debug(0, "Reading info struct\n");
@@ -730,8 +866,8 @@ int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 
 /* input and output filenames */
 #ifdef RISCOS
-PNG_CONST char *inname = "pngtest_png";
+PNG_CONST char *inname = "pngtest/png";
-PNG_CONST char *outname = "pngout_png";
+PNG_CONST char *outname = "pngout/png";
 #else
 static char *inname = "pngtest.png";
 static char *outname = "pngout.png";
@@ -770,20 +906,28 @@ main(int argc, char *argv[])
    if (argc > 1)
    {
       if (strcmp(argv[1], "-m") == 0)
+      {
          multiple = 1;
+         status_dots_requested = 0;
+      }
       else if (strcmp(argv[1], "-mv") == 0 ||
                strcmp(argv[1], "-vm") == 0 )
       {
          multiple = 1;
          verbose = 1;
+         status_dots_requested = 1;
       }
       else if (strcmp(argv[1], "-v") == 0)
       {
          verbose = 1;
+         status_dots_requested = 1;
          inname = argv[2];
       }
       else
+      {
          inname = argv[1];
+         status_dots_requested = 0;
+      }
    }
 
    if (!multiple && argc == 3+verbose)
@@ -813,7 +957,12 @@ main(int argc, char *argv[])
          fprintf(STDERR, "Testing %s:",argv[i]);
          kerror = test_one_file(argv[i], outname);
          if (kerror == 0) 
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+            fprintf(STDERR, " PASS (%lu black pixels)\n",black_pixels);
+#else
             fprintf(STDERR, " PASS\n");
+#endif
          else {
             fprintf(STDERR, " FAIL\n");
             ierror += kerror;
@@ -847,12 +996,20 @@ main(int argc, char *argv[])
 #ifdef PNGTEST_MEMORY_DEBUG
          int allocation_now = current_allocation;
 #endif
+         if (i == 1) status_dots_requested = 1;
+         else if(verbose == 0)status_dots_requested = 0;
          if (i == 0 || verbose == 1 || ierror != 0)
             fprintf(STDERR, "Testing %s:",inname);
          kerror = test_one_file(inname, outname);
          if(kerror == 0)
          {
-            if(verbose == 1 || i == 2) fprintf(STDERR, " PASS\n");
+            if(verbose == 1 || i == 2)
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+                fprintf(STDERR, " PASS (%lu black pixels)\n",black_pixels);
+#else
+                fprintf(STDERR, " PASS\n");
+#endif
          }
          else
          {

pngtrans.c

@@ -1,12 +1,12 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 #define PNG_INTERNAL

pngwio.c

@@ -1,12 +1,12 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  *
  * This file provides a location for all output.  Users which need
  * special handling are expected to write functions which have the same

pngwrite.c

@@ -1,12 +1,12 @@
    
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 /* get internal access to png.h */
@@ -527,6 +527,9 @@ png_write_row(png_structp png_ptr, png_bytep row)
 
    /* Find a filter if necessary, filter the row and write it out. */
    png_write_find_filter(png_ptr, &(png_ptr->row_info));
+
+   if (png_ptr->write_row_fn != NULL)
+      (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
@@ -947,3 +950,20 @@ png_set_compression_method(png_structp png_ptr, int method)
    png_ptr->zlib_method = method;
 }
 
+void
+png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
+{
+   png_ptr->write_row_fn = write_row_fn;
+}
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+void
+png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
+   write_user_transform_fn)
+{
+   png_debug(1, "in png_set_write_user_transform_fn\n");
+   png_ptr->transformations |= PNG_USER_TRANSFORM;
+   png_ptr->write_user_transform_fn = write_user_transform_fn;
+}
+#endif
+

pngwtran.c

@@ -1,12 +1,12 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 #define PNG_INTERNAL
@@ -19,6 +19,21 @@ void
 png_do_write_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_write_transformations\n");
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+      if(png_ptr->write_user_transform_fn != NULL)
+        (*(png_ptr->write_user_transform_fn)) /* user write transform function */
+          (png_ptr,                    /* png_ptr */
+           &(png_ptr->row_info),       /* row_info:     */
+             /*  png_uint_32 width;          width of row */
+             /*  png_uint_32 rowbytes;       number of bytes in row */
+             /*  png_byte color_type;        color type of pixels */
+             /*  png_byte bit_depth;         bit depth of samples */
+             /*  png_byte channels;          number of channels (1-4) */
+             /*  png_byte pixel_depth;       bits per pixel (depth*channels) */
+           png_ptr->row_buf + 1);      /* start of pixel data for row */
+#endif
 #if defined(PNG_WRITE_FILLER_SUPPORTED)
    if (png_ptr->transformations & PNG_FILLER)
       png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,

pngwutil.c

@@ -1,12 +1,12 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 0.99e
+ * libpng 1.00
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * February 28, 1998
+ * March 7, 1998
  */
 
 #define PNG_INTERNAL

scripts/makefile.lnx

@@ -21,8 +21,10 @@ LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
 RANLIB=ranlib
 #RANLIB=echo
 
+# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# have to change it.
 PNGMAJ = 2
-PNGMIN = 0.99
+PNGMIN = 1.00
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h

scripts/makefile.os2

@@ -0,0 +1,69 @@
+# makefile for libpng on OS/2 with gcc
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Related files: pngos2.def
+
+CC=gcc -Zomf -s
+
+# Where the zlib library and include files are located
+ZLIBLIB=../zlib
+ZLIBINC=../zlib
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+         -Wmissing-declarations -Wtraditional -Wcast-align \
+         -Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+CFLAGS=-I$(ZLIBINC) -Wall -O6 -funroll-loops -malign-loops=2 \
+       -malign-functions=2 #$(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lzdll -Zcrtdll
+AR=emxomfar
+
+PNGLIB=png.lib
+IMPLIB=emximp
+SHAREDLIB=png.dll
+SHAREDLIBIMP=pngdll.lib
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+       pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+       pngwtran.o pngmem.o pngerror.o pngpread.o
+
+.SUFFIXES:      .c .o
+
+all: $(PNGLIB) $(SHAREDLIB) $(SHAREDLIBIMP)
+
+$(PNGLIB): $(OBJS)
+	$(AR) rc $@ $(OBJS)
+
+$(SHAREDLIB): $(OBJS) pngos2.def
+	$(CC) $(LDFLAGS) -Zdll -o $@ $^
+
+$(SHAREDLIBIMP): pngos2.def
+	$(IMPLIB) -o $@ $^
+
+pngtest.exe: pngtest.o png.dll pngdll.lib
+	$(CC) -o $@ $(CFLAGS) $< $(LDFLAGS)
+
+test: pngtest.exe
+	./pngtest.exe
+
+clean:
+	rm -f *.o $(PNGLIB) png.dll pngdll.lib pngtest.exe pngout.png
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.s2x

@@ -0,0 +1,98 @@
+ makefile for libpng on Solaris 2.x with gcc
+# Contributed by William L. Sebok, based on makefile.lnx
+# Copyright (C) 1996, 1997 Andreas Dilger
+# Copyright (C) 1998 Greg Roelofs
+# For conditions of distribution and use, see copyright notice in png.h
+
+CC=gcc
+
+# Where the zlib library and include files are located
+ZLIBLIB=/usr/local/lib
+ZLIBINC=/usr/local/include
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+         -Wmissing-declarations -Wtraditional -Wcast-align \
+         -Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+CFLAGS=-I$(ZLIBINC) -Wall -O3 \
+      #$(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng -lz -lm
+
+#RANLIB=ranlib
+RANLIB=echo
+
+# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# have to change it.
+PNGMAJ = 2
+PNGMIN = 1.00
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+# where make install puts libpng.a, libpng.so*, and png.h
+prefix=/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+       pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+       pngwtran.o pngmem.o pngerror.o pngpread.o
+
+OBJSDLL = $(OBJS:.o=.pic.o)
+
+.SUFFIXES:      .c .o .pic.o
+
+.c.pic.o:
+	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c
+
+all: libpng.a libpng.so pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@ $(OBJS)
+	$(RANLIB) $@
+
+libpng.so: libpng.so.$(PNGMAJ)
+	ln -sf libpng.so.$(PNGMAJ) libpng.so
+
+libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
+	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+
+libpng.so.$(PNGVER): $(OBJSDLL)
+	$(LD) -G -L$(LIBPATH) -R$(LIBPATH) -h libpng.so.$(PNGMAJ) \
+	 -o libpng.so.$(PNGVER) $(OBJSDLL) -lz
+
+pngtest: pngtest.o libpng.so
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a libpng.so.$(PNGVER)
+	-@mkdir $(INCPATH) $(LIBPATH)
+	cp png.h pngconf.h $(INCPATH)
+	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
+	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
+	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
+	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
+	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
+	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+
+clean:
+	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.tc3

@@ -9,18 +9,22 @@ CFLAGS=-O2 -Z $(MODEL) -I..\zlib
 CC=tcc
 LD=tcc
 LIB=tlib
-LDFLAGS=$(MODEL)
+LDFLAGS=$(MODEL) -L..\zlib
 O=.obj
+E=.exe
 
 # 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)
 OBJS2 = pngmem$(O) pngpread$(O) pngread$(O) pngerror$(O) pngwrite$(O)
 OBJS3 = pngrtran$(O) pngwtran$(O) pngrio$(O) pngwio$(O)
 OBJSL1 = +png$(O) +pngset$(O) +pngget$(O) +pngrutil$(O) +pngtrans$(O)
-OBJSL2 = +pngwutil$(O) +pngmem$(O) +pngpread$(O) +pngread$(O) +pngerror$(O)
+OBJSL2 = +pngwutil$(O) +pngmem$(O) +pngpread$(O) +pngread$(O)
-OBJSL3 = +pngwrite$(O) +pngrtran$(O) +pngwtran$(O) +pngrio$(O) +pngwio$(O)
++pngerror$(O)
+OBJSL3 = +pngwrite$(O) +pngrtran$(O) +pngwtran$(O) +pngrio$(O)
++pngwio$(O)
 
-all: libpng.lib
+all: libpng.lib pngtest.exe
 
 png$(O): png.h pngconf.h
 		  $(CC) -c $(CFLAGS) $*.c
@@ -75,4 +79,7 @@ libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
         $(LIB) libpng +$(OBJSL2)
         $(LIB) libpng +$(OBJSL3)
 
+pngtest$(E): pngtest$(O) libpng.lib
+        $(CC) $(LDFLAGS) pngtest.obj libpng.lib zlib.lib
+
 # End of makefile for libpng

scripts/makefile.wat

@@ -0,0 +1,88 @@
+# Makefile for libpng
+# Watcom 10a+ 32-bit protected mode flat memory model
+
+# Adapted by Pawel Mrochen, based on makefile.msc
+# For conditions of distribution and use, see copyright notice in png.h
+# Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
+
+# To use, do "wmake -f makefile.wat"
+
+# ------------- Watcom 10a+ -------------
+MODEL=-mf
+CFLAGS= $(MODEL) -fpi87 -fp5 -5r -oaeilmnrt -s -i=..\zlib
+CC=wcc386
+LD=wcl386
+LIB=wlib -b -c
+LDFLAGS=
+O=.obj
+
+#uncomment next to put error messages in a file
+#ERRFILE= >> pngerrs
+
+# variables
+OBJS1 = png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O)
+OBJS2 = pngmem$(O) pngpread$(O) pngread$(O) pngerror$(O) pngwrite$(O)
+OBJS3 = pngrtran$(O) pngwtran$(O) pngrio$(O) pngwio$(O)
+
+all: test
+
+png$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngset$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngget$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngread$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngpread$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngrtran$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngrutil$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngerror$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngmem$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngrio$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwio$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngtest$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngtrans$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwrite$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwtran$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwutil$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
+	$(LIB) -n libpng.lib +$(OBJS1)
+	$(LIB) libpng.lib +$(OBJS2)
+	$(LIB) libpng.lib +$(OBJS3)
+
+pngtest.exe: pngtest.obj libpng.lib
+	$(LD) $(LDFLAGS) pngtest.obj libpng.lib ..\zlib\zlib.lib
+
+test: pngtest.exe
+	pngtest
+
+# End of makefile for libpng

scripts/pngos2.def

@@ -0,0 +1,286 @@
+;----------------------------------------
+; PNGLIB module definition file for OS/2
+;----------------------------------------
+
+LIBRARY		PNG
+DESCRIPTION	"PNG image compression library for OS/2"
+CODE		PRELOAD MOVEABLE DISCARDABLE
+DATA		PRELOAD MOVEABLE MULTIPLE
+
+EXPORTS
+  png_set_sig_bytes
+  png_sig_cmp
+  png_check_sig
+  png_create_read_struct
+  png_create_write_struct
+  png_write_chunk
+  png_write_chunk_start
+  png_write_chunk_data
+  png_write_chunk_end
+  png_create_info_struct
+  png_info_init
+  png_write_info
+  png_read_info
+  png_convert_to_rfc1123
+  png_convert_from_struct_tm
+  png_convert_from_time_t
+  png_set_expand
+  png_set_bgr
+  png_set_gray_to_rgb
+; png_set_rgb_to_gray
+  png_build_grayscale_palette
+  png_set_strip_alpha
+  png_set_swap_alpha
+  png_set_invert_alpha
+  png_set_filler
+  png_set_swap
+  png_set_packing
+  png_set_packswap
+  png_set_shift
+  png_set_interlace_handling
+  png_set_invert_mono
+  png_set_background
+  png_set_strip_16
+  png_set_dither
+  png_set_gamma
+  png_set_flush
+  png_write_flush
+  png_start_read_image
+  png_read_update_info
+  png_read_rows
+  png_read_row
+  png_read_image
+  png_write_row
+  png_write_rows
+  png_write_image
+  png_write_end
+  png_read_end
+  png_destroy_info_struct
+  png_destroy_read_struct
+  png_read_destroy
+  png_destroy_write_struct
+; png_write_destroy_info
+  png_write_destroy
+  png_set_crc_action
+  png_set_filter
+  png_set_filter_heuristics
+  png_set_compression_level
+  png_set_compression_mem_level
+  png_set_compression_strategy
+  png_set_compression_window_bits
+  png_set_compression_method
+  png_init_io
+  png_set_error_fn
+  png_get_error_ptr
+  png_set_write_fn
+  png_set_read_fn
+  png_set_write_status_fn
+  png_set_read_status_fn
+  png_get_io_ptr
+  png_set_progressive_read_fn
+  png_set_read_status_fn
+  png_set_read_user_transform_fn
+  png_set_write_status_fn
+  png_set_write_user_transform_fn
+  png_get_progressive_ptr
+  png_process_data
+  png_progressive_combine_row
+  png_malloc
+  png_free
+  png_memcpy_check
+  png_memset_check
+; png_debug_malloc
+; png_debug_free
+; png_far_to_near
+  png_error
+  png_chunk_error
+  png_warning
+  png_chunk_warning
+  png_get_valid
+  png_get_rowbytes
+  png_get_channels
+  png_get_image_width
+  png_get_image_height
+  png_get_bit_depth
+  png_get_color_type
+  png_get_filter_type
+  png_get_interlace_type
+  png_get_compression_type
+  png_get_pixels_per_meter
+  png_get_pixel_aspect_ratio
+  png_get_x_offset_pixels
+  png_get_y_offset_pixels
+  png_get_x_offset_microns
+  png_get_y_offset_microns
+  png_get_signature
+  png_get_bKGD
+  png_set_bKGD
+  png_get_cHRM
+  png_set_cHRM
+  png_get_gAMA
+  png_set_gAMA
+  png_get_hIST
+  png_set_hIST
+  png_get_IHDR
+  png_set_IHDR
+  png_get_oFFs
+  png_set_oFFs
+  png_get_pCAL
+  png_set_pCAL
+  png_get_pHYs
+  png_set_pHYs
+  png_get_PLTE
+  png_set_PLTE
+  png_get_sBIT
+  png_set_sBIT
+  png_get_sRGB
+  png_set_sRGB
+  png_set_sRGB_gAMA_and_cHRM
+  png_get_text
+  png_set_text
+  png_get_tIME
+  png_set_tIME
+  png_get_tRNS
+  png_set_tRNS
+
+  png_create_struct
+  png_destroy_struct
+  png_info_destroy
+  png_zalloc
+  png_zfree
+  png_reset_crc
+  png_write_data
+  png_read_data
+  png_crc_read
+  png_crc_finish
+  png_crc_error
+  png_calculate_crc
+  png_flush
+  png_save_uint_32
+  png_save_int_32
+  png_save_uint_16
+  png_write_sig
+  png_write_IHDR
+  png_write_PLTE
+  png_write_IDAT
+  png_write_IEND
+  png_write_gAMA
+  png_write_sBIT
+  png_write_cHRM
+  png_write_sRGB
+  png_write_tRNS
+  png_write_bKGD
+  png_write_hIST
+  png_check_keyword
+  png_write_tEXt
+  png_write_zTXt
+  png_write_oFFs
+  png_write_pCAL
+  png_write_pHYs
+  png_write_tIME
+  png_write_finish_row
+  png_write_start_row
+  png_build_gamma_table
+  png_combine_row
+  png_do_read_interlace
+  png_do_write_interlace
+  png_read_filter_row
+  png_write_find_filter
+  png_write_filtered_row
+  png_read_finish_row
+  png_read_start_row
+  png_read_transform_info
+  png_do_read_filler
+  png_do_read_swap_alpha
+  png_do_write_swap_alpha
+  png_do_read_invert_alpha
+  png_do_write_invert_alpha
+  png_do_strip_filler
+  png_do_swap
+  png_do_packswap
+; png_do_rgb_to_gray
+  png_do_gray_to_rgb
+  png_do_unpack
+  png_do_unshift
+  png_do_invert
+  png_do_chop
+  png_do_dither
+; png_correct_palette
+  png_do_bgr
+  png_do_pack
+  png_do_shift
+  png_do_background
+  png_do_gamma
+  png_do_expand_palette
+  png_do_expand
+  png_handle_IHDR
+  png_handle_PLTE
+  png_handle_IEND
+  png_handle_gAMA
+  png_handle_sBIT
+  png_handle_cHRM
+  png_handle_sRGB
+  png_handle_tRNS
+  png_handle_bKGD
+  png_handle_hIST
+  png_handle_oFFs
+  png_handle_pCAL
+  png_handle_pHYs
+  png_handle_tIME
+  png_handle_tEXt
+  png_handle_zTXt
+  png_handle_unknown
+  png_check_chunk_name
+  png_do_read_transformations
+  png_do_write_transformations
+  png_init_read_transformations
+  png_push_read_chunk
+  png_push_read_sig
+; png_push_check_crc
+  png_push_crc_skip
+  png_push_crc_finish
+  png_push_fill_buffer
+  png_push_save_buffer
+  png_push_restore_buffer
+  png_push_read_IDAT
+  png_process_IDAT_data
+  png_push_process_row
+  png_push_handle_unknown
+  png_push_have_info
+  png_push_have_end
+  png_push_have_row
+; png_push_read_end
+  png_process_some_data
+  png_read_push_finish_row
+  png_push_handle_tEXt
+  png_push_read_tEXt
+  png_push_handle_zTXt
+  png_push_read_zTXt
+
+  png_libpng_ver
+  png_pass_start
+  png_pass_inc
+  png_pass_ystart
+  png_pass_yinc
+  png_pass_mask
+  png_pass_dsp_mask
+; png_pass_width
+; png_pass_height
+
+  png_IHDR
+  png_IDAT
+  png_IEND
+  png_PLTE
+  png_bKGD
+  png_cHRM
+  png_gAMA
+  png_hIST
+  png_oFFs
+  png_pCAL
+  png_pHYs
+  png_sBIT
+  png_sRGB
+  png_tEXt
+  png_tIME
+  png_tRNS
+  png_zTXt