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Imported from libpng-1.0.0a.tar

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Glenn Randers-Pehrson 1998-03-09 23:02:06 -06:00
parent 0f7202f074
commit 8f8fb6ae7a
26 changed files with 159 additions and 120 deletions
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7
CHANGES
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@ -271,3 +271,10 @@ version 1.00 [March 7, 1998]
version 1.0.0 [March 8, 1998] version 1.0.0 [March 8, 1998]
Changed name from 1.00 to 1.0.0 (Adam Costello) Changed name from 1.00 to 1.0.0 (Adam Costello)
Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert) Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
version 1.0.0a [March 9, 1998]
Fixed three bugs in pngrtran.c to make gamma+background handling consistent
(Greg Roelofs)
Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
for major, minor, and bugfix releases. This is 10001. (Adam Costello,
Tom Lane)
Make months range from 1-12 in png_convert_to_rfc1123

4
INSTALL
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@ -1,5 +1,5 @@
Installing libpng version 1.0.0 March 8, 1998 Installing libpng version 1.0.0a March 9, 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
@ -10,7 +10,7 @@ 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-1.0.0 or "lpng100" and "zlib-1.1.1" might be called "libpng-1.0.0a or "lpng100" and "zlib-1.1.1"
or "zlib111") so that you have directories called "zlib" and "libpng". or "zlib111") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this: Your directory structure should look like this:

2
README
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@ -1,4 +1,4 @@
README for libpng 1.0.0 (shared library 2.1) README for libpng 1.0.0a (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.

47
libpng.3
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@ -1,4 +1,4 @@
.TH LIBPNG 3 "March 8, 1998" .TH LIBPNG 3 "March 9, 1998"
.SH NAME .SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library libpng \- Portable Network Graphics (PNG) Reference Library
.SH SYNOPSIS .SH SYNOPSIS
@ -396,7 +396,7 @@ 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 1.0.0 March 8, 1998 libpng version 1.0.0a March 9, 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
@ -2291,28 +2291,29 @@ on the library has not always been consistent and straightforward.
The following table summarizes matters since version 0.89c, which was The following table summarizes matters since version 0.89c, which was
the first widely used release: the first widely used release:
source png.h shared-lib source png.h png.h shared-lib
version string version version string int version
------- ------ ---------- ------- ------ ------ ----------
0.89c ("1.0 beta 3") 0.89 1.0.89 0.89c 0.89 89 1.0.89
0.90 ("1.0 beta 4") 0.90 0.90 0.90 0.90 90 0.90 [should be 2.0.90]
[should have been 2.0.90] 0.95 0.95 95 0.95 [should be 2.0.95]
0.95 ("1.0 beta 5") 0.95 0.95 0.96 0.96 96 0.96 [should be 2.0.96]
[should have been 2.0.95] 0.97b 7") 1.00.97 97 1.0.1 [should be 2.0.97]
0.96 ("1.0 beta 6") 0.96 0.96 0.97c 0.97 97 2.0.97
[should have been 2.0.96] 0.98 0.98 98 2.0.98
0.97b ("1.00.97 beta 7") 1.00.97 1.0.0 0.99 0.99 98 2.0.99
[should have been 2.0.97] 0.99a-m 0.99 99 2.0.99
0.97c 0.97 2.0.97 1.00 1.00 100 2.1.0 [should be 10000]
0.98 0.98 2.0.98 1.0.0 1.0.0 100 2.1.0 [should be 10000]
0.99 0.99 2.0.99 1.0.1 1.0.1 10001 2.1.0
0.99a-m 0.99 2.0.99
1.0.0 1.00 2.1.0
Henceforth the source version will match the shared-library minor Henceforth the source version will match the shared-library
and patch numbers; the shared-library major version number will be minor and patch numbers; the shared-library major version number will be
used for changes in backward compatibility, as it is intended. used for changes in backward compatibility, as it is intended.
The PNG_PNGLIB_VER macro, which is not used within libpng but
is available for applications, is an unsigned integer of the form
xyyzz corresponding to the source version x.y.z (leading zeros in y and z)
.SH "SEE ALSO" .SH "SEE ALSO"
libpngpf(3), png(5) libpngpf(3), png(5)
.LP .LP
@ -2365,7 +2366,7 @@ 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 1.0.0 (March 8, 1998): Libpng version 1.0.0a March 9, 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).

2
libpng.txt
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@ -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 1.0.0 March 8, 1998 libpng version 1.0.0a March 9, 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

2
libpngpf.3
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@ -1,4 +1,4 @@
.TH LIBPNGPF 3 "March 8, 1998" .TH LIBPNGPF 3 "March 9, 1998"
.SH NAME .SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library libpng \- Portable Network Graphics (PNG) Reference Library
(private functions) (private functions)

0
lpng100a Normal file
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2
png.5
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@ -1,4 +1,4 @@
.TH PNG 5 "March 8, 1998" .TH PNG 5 "March 9, 1998"
.SH NAME .SH NAME
png \- Portable Network Graphics (PNG) format png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION .SH DESCRIPTION

6
png.c
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@ -1,12 +1,12 @@
/* png.c - location for general purpose libpng functions /* png.c - location for general purpose libpng functions
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -16,7 +16,7 @@
/* 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[6] = "1.0.0"; char png_libpng_ver[12] = "1.0.0a";
/* 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};

52
png.h
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@ -1,12 +1,12 @@
/* png.h - header file for PNG reference library /* png.h - header file for PNG reference library
* *
* libpng 1.0.0 * libpng 1.0.0a
* For conditions of distribution and use, see the COPYRIGHT NOTICE below. * 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
* March 8, 1998 * March 9, 1998
* *
* Note about libpng version numbers: * Note about libpng version numbers:
* *
@ -16,23 +16,29 @@
* The following table summarizes matters since version 0.89c, which was * The following table summarizes matters since version 0.89c, which was
* the first widely used release: * the first widely used release:
* *
* source png.h shared-lib * source png.h png.h shared-lib
* version string version * version string int version
* ------- ------ ---------- * ------- ------ ------ ----------
* 0.89c ("1.0 beta 3") 0.89 1.0.89 * 0.89c ("1.0 beta 3") 0.89 89 1.0.89
* 0.90 ("1.0 beta 4") 0.90 0.90 [should have been 2.0.90] * 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90]
* 0.95 ("1.0 beta 5") 0.95 0.95 [should have been 2.0.95] * 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95]
* 0.96 ("1.0 beta 6") 0.96 0.96 [should have been 2.0.96] * 0.96 ("1.0 beta 6") 0.96 96 0.96 [should have been 2.0.96]
* 0.97b ("1.00.97 beta 7") 1.00.97 1.0.0 [should have been 2.0.97] * 0.97b ("1.00.97 beta 7") 1.00.97 97 1.0.1 [should have been 2.0.97]
* 0.97c 0.97 2.0.97 * 0.97c 0.97 97 2.0.97
* 0.98 0.98 2.0.98 * 0.98 0.98 98 2.0.98
* 0.99 0.99 2.0.99 * 0.99 0.99 98 2.0.99
* 0.99a-m 0.99 2.0.99 * 0.99a-m 0.99 99 2.0.99
* 1.0.0 1.00 2.1.0 * 1.00 1.00 100 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
* *
* 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
* used for changes in backward compatibility, as it is intended. * used for changes in backward compatibility, as it is intended.
* The PNG_PNGLIB_VER macro, which is not used within libpng but
* is available for applications, is an unsigned integer of the form
* xyyzz corresponding to the source version x.y.z (leading zeros in y and z)
*
* *
* See libpng.txt for more information. The PNG specification is available * See libpng.txt for more information. The PNG specification is available
* as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> * as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
@ -112,19 +118,21 @@ 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 "1.0.0" #define PNG_LIBPNG_VER_STRING "1.0.0a"
/* careful here. At one time, I wanted to use 082, but that would be octal. /* Gareful here. At one time, Guy wanted to use 082, but that would be octal.
* Version 1.0.0 will be 100 here, etc. * We must not include leading zeroes.
*/ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
#define PNG_LIBPNG_VER 100 * 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*/
#define PNG_LIBPNG_VER 10001
/* 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)
/* Version information for C files, stored in png.c. This had better match /* Version information for C files, stored in png.c. This had better match
* the version above. * the version above.
*/ */
extern char png_libpng_ver[6]; extern char png_libpng_ver[12]; /* need room for 99.99.99aa */
/* Structures to facilitate easy interlacing. See png.c for more details */ /* Structures to facilitate easy interlacing. See png.c for more details */
extern int FARDATA png_pass_start[7]; extern int FARDATA png_pass_start[7];
@ -1834,7 +1842,7 @@ PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
#endif #endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR) #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
#endif #endif

4
pngconf.h
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@ -1,12 +1,12 @@
/* pngconf.h - machine configurable file for libpng /* pngconf.h - machine configurable file for libpng
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
/* Any machine specific code is near the front of this file, so if you /* Any machine specific code is near the front of this file, so if you

4
pngerror.c
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@ -1,12 +1,12 @@
/* pngerror.c - stub functions for i/o and memory allocation /* pngerror.c - stub functions for i/o and memory allocation
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file provides a location for all error handling. Users which * This file provides a location for all error handling. Users which
* need special error handling are expected to write replacement functions * need special error handling are expected to write replacement functions

4
pngget.c
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@ -1,12 +1,12 @@
/* pngget.c - retrieval of values from info struct /* pngget.c - retrieval of values from info struct
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL

4
pngmem.c
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@ -1,12 +1,12 @@
/* pngmem.c - stub functions for memory allocation /* pngmem.c - stub functions for memory allocation
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file provides a location for all memory allocation. Users which * This file provides a location for all memory allocation. Users which
* need special memory handling are expected to modify the code in this file * need special memory handling are expected to modify the code in this file

4
pngpread.c
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@ -1,12 +1,12 @@
/* pngpread.c - read a png file in push mode /* pngpread.c - read a png file in push mode
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL

6
pngread.c
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@ -1,12 +1,12 @@
/* pngread.c - read a PNG file /* pngread.c - read a PNG file
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file contains routines that an application calls directly to * This file contains routines that an application calls directly to
* read a PNG file or stream. * read a PNG file or stream.
@ -719,10 +719,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
#endif #endif
if (png_ptr->flags & PNG_FLAG_FREE_PALETTE) if (png_ptr->flags & PNG_FLAG_FREE_PALETTE)
png_zfree(png_ptr, png_ptr->palette); png_zfree(png_ptr, png_ptr->palette);
#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_bKGD_SUPPORTED)
if (png_ptr->flags & PNG_FLAG_FREE_TRANS) if (png_ptr->flags & PNG_FLAG_FREE_TRANS)
png_free(png_ptr, png_ptr->trans); png_free(png_ptr, png_ptr->trans);
#endif
#if defined(PNG_READ_hIST_SUPPORTED) #if defined(PNG_READ_hIST_SUPPORTED)
if (png_ptr->flags & PNG_FLAG_FREE_HIST) if (png_ptr->flags & PNG_FLAG_FREE_HIST)
png_free(png_ptr, png_ptr->hist); png_free(png_ptr, png_ptr->hist);

4
pngrio.c
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@ -1,12 +1,12 @@
/* pngrio.c - functions for data input /* pngrio.c - functions for data input
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file provides a location for all input. Users which need * This file provides a location for all input. Users which need
* special handling are expected to write a function which has the same * special handling are expected to write a function which has the same

85
pngrtran.c
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@ -1,12 +1,12 @@
/* pngrtran.c - transforms the data in a row for PNG readers /* pngrtran.c - transforms the data in a row for PNG readers
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file contains functions optionally called by an application * This file contains functions optionally called by an application
* in order to tell libpng how to handle data when reading a PNG. * in order to tell libpng how to handle data when reading a PNG.
@ -665,7 +665,8 @@ png_init_read_transformations(png_structp png_ptr)
if (png_ptr->transformations & PNG_INVERT_ALPHA) if (png_ptr->transformations & PNG_INVERT_ALPHA)
{ {
#if defined(PNG_READ_EXPAND_SUPPORTED) #if defined(PNG_READ_EXPAND_SUPPORTED)
if (png_ptr->transformations & !PNG_EXPAND) /* GRR BUG #1: was (png_ptr->transformations & !PNG_EXPAND) */
if (!(png_ptr->transformations & PNG_EXPAND))
#endif #endif
{ {
/* invert the alpha channel (in tRNS) unless the pixels are /* invert the alpha channel (in tRNS) unless the pixels are
@ -712,41 +713,65 @@ png_init_read_transformations(png_structp png_ptr)
} }
else else
{ {
double g; double g, gs;
g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma); /*
GRR BUG #3: inconsistent with handling of full RGBA below
if (png_ptr->background_gamma_type==PNG_BACKGROUND_GAMMA_SCREEN|| g = 1.0 / png_ptr->background_gamma;
fabs(g - 1.0) < PNG_GAMMA_THRESHOLD) gs = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma);
*/
switch (png_ptr->background_gamma_type)
{ {
back.red = (png_byte)png_ptr->background.red; case PNG_BACKGROUND_GAMMA_SCREEN:
g = (png_ptr->screen_gamma);
gs = 1.0;
break;
case PNG_BACKGROUND_GAMMA_FILE:
g = 1.0 / (png_ptr->gamma);
gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
break;
case PNG_BACKGROUND_GAMMA_UNIQUE:
g = 1.0 / (png_ptr->background_gamma);
gs = 1.0 / (png_ptr->background_gamma *
png_ptr->screen_gamma);
break;
default:
g = 1.0; /* back_1 */
gs = 1.0; /* back */
}
if (
/*
GRR BUG #2: This creates self-inconsistent images--fully
transparent and fully opaque look fine, but translucent
pixels are wrong (too bright if XV's code can be trusted).
Commenting it out makes an internally self-consistent
image, but still not consistent with RGBA version of same
thing (again, too bright in XV).
png_ptr->background_gamma_type==PNG_BACKGROUND_GAMMA_SCREEN||
*/
fabs(gs - 1.0) < PNG_GAMMA_THRESHOLD)
{
back.red = (png_byte)png_ptr->background.red;
back.green = (png_byte)png_ptr->background.green; back.green = (png_byte)png_ptr->background.green;
back.blue = (png_byte)png_ptr->background.blue; back.blue = (png_byte)png_ptr->background.blue;
} }
else else
{ {
back.red = back.red = (png_byte)(pow(
(png_byte)(pow((double)png_ptr->background.red/255, g) * (double)png_ptr->background.red/255, gs) * 255.0 + .5);
255.0 + 0.5); back.green = (png_byte)(pow(
back.green = (double)png_ptr->background.green/255, gs) * 255.0 + .5);
(png_byte)(pow((double)png_ptr->background.green/255, g) * back.blue = (png_byte)(pow(
255.0 + 0.5); (double)png_ptr->background.blue/255, gs) * 255.0 + .5);
back.blue =
(png_byte)(pow((double)png_ptr->background.blue/255, g) *
255.0 + 0.5);
} }
g = 1.0 / png_ptr->background_gamma; back_1.red = (png_byte)(pow(
(double)png_ptr->background.red/255, g) * 255.0 + .5);
back_1.red = back_1.green = (png_byte)(pow(
(png_byte)(pow((double)png_ptr->background.red/255, g) * (double)png_ptr->background.green/255, g) * 255.0 + .5);
255.0 + 0.5); back_1.blue = (png_byte)(pow(
back_1.green = (double)png_ptr->background.blue/255, g) * 255.0 + .5);
(png_byte)(pow((double)png_ptr->background.green/255, g) *
255.0 + 0.5);
back_1.blue =
(png_byte)(pow((double)png_ptr->background.blue/255, g) *
255.0 + 0.5);
} }
for (i = 0; i < num_palette; i++) for (i = 0; i < num_palette; i++)

4
pngrutil.c
View File

@ -1,12 +1,12 @@
/* pngrutil.c - utilities to read a PNG file /* pngrutil.c - utilities to read a PNG file
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file contains routines which are only called from within * This file contains routines which are only called from within
* libpng itself during the course of reading an image. * libpng itself during the course of reading an image.

4
pngset.c
View File

@ -1,12 +1,12 @@
/* pngset.c - storage of image information into info struct /* pngset.c - storage of image information into info struct
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* The functions here are used during reads to store data from the file * The functions here are used during reads to store data from the file
* into the info struct, and during writes to store application data * into the info struct, and during writes to store application data

4
pngtest.c
View File

@ -1,12 +1,12 @@
/* pngtest.c - a simple test program to test libpng /* pngtest.c - a simple test program to test libpng
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This program reads in a PNG image, writes it out again, and then * 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 * compares the two files. If the files are identical, this shows that

4
pngtrans.c
View File

@ -1,12 +1,12 @@
/* 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 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL

4
pngwio.c
View File

@ -1,12 +1,12 @@
/* pngwio.c - functions for data output /* pngwio.c - functions for data output
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
* *
* This file provides a location for all output. Users which need * This file provides a location for all output. Users which need
* special handling are expected to write functions which have the same * special handling are expected to write functions which have the same

8
pngwrite.c
View File

@ -1,12 +1,12 @@
/* pngwrite.c - general routines to write a PNG file /* pngwrite.c - general routines to write a PNG file
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
/* get internal access to png.h */ /* get internal access to png.h */
@ -239,7 +239,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{ {
char near_time_buf[29]; char near_time_buf[29];
sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000", sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 31, short_months[ptime->month], ptime->day % 31, short_months[ptime->month - 1],
ptime->year, ptime->hour % 24, ptime->minute % 60, ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61); ptime->second % 61);
png_memcpy(png_ptr->time_buffer, near_time_buf, png_memcpy(png_ptr->time_buffer, near_time_buf,
@ -247,7 +247,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
} }
#else #else
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000", sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 31, short_months[ptime->month], ptime->day % 31, short_months[ptime->month - 1],
ptime->year, ptime->hour % 24, ptime->minute % 60, ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61); ptime->second % 61);
#endif #endif

4
pngwtran.c
View File

@ -1,12 +1,12 @@
/* pngwtran.c - transforms the data in a row for PNG writers /* pngwtran.c - transforms the data in a row for PNG writers
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL

8
pngwutil.c
View File

@ -1,12 +1,12 @@
/* pngwutil.c - utilities to write a PNG file /* pngwutil.c - utilities to write a PNG file
* *
* libpng 1.0.0 * libpng 1.0.0a
* 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
* Copyright (c) 1998, Glenn Randers-Pehrson * Copyright (c) 1998, Glenn Randers-Pehrson
* March 8, 1998 * March 9, 1998
*/ */
#define PNG_INTERNAL #define PNG_INTERNAL
@ -340,7 +340,7 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
png_byte buf[4]; png_byte buf[4];
png_debug(1, "in png_write_gAMA\n"); png_debug(1, "in png_write_gAMA\n");
/* file_gamma is saved in 1/100,000ths */ /* file_gamma is saved in 1/1000000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5); igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma); png_save_uint_32(buf, igamma);
png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4); png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
@ -426,7 +426,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
png_byte buf[32]; png_byte buf[32];
png_debug(1, "in png_write_cHRM\n"); png_debug(1, "in png_write_cHRM\n");
/* each value is saved int 1/100,000ths */ /* each value is saved int 1/1000000ths */
if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 || if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
white_x + white_y > 1.0) white_x + white_y > 1.0)
{ {