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[master] Documented the fact that png_set_dither() is no longer supported.
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Glenn Randers-Pehrson
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0f544f62d6
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930af7d50b
@ -271,6 +271,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
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png_set_gamma(png_ptr, screen_gamma, 0.45455);
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}
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#ifdef PNG_READ_DITHER_SUPPORTED
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/* Dither RGB files down to 8 bit palette or reduce palettes
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* to the number of colors available on your screen.
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*/
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@ -299,6 +300,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
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max_screen_colors, histogram, 0);
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}
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}
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#endif /* PNG_READ_DITHER_SUPPORTED */
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/* Invert monochrome files to have 0 as white and 1 as black */
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png_set_invert_mono(png_ptr);
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@ -1,6 +1,6 @@
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libpng.txt - A description on how to use and modify libpng
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libpng version 1.4.2rc01 - April 10, 2010
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libpng version 1.4.2rc02 - April 14, 2010
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Updated and distributed by Glenn Randers-Pehrson
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<glennrp at users.sourceforge.net>
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Copyright (c) 1998-2009 Glenn Randers-Pehrson
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@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
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Based on:
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libpng versions 0.97, January 1998, through 1.4.2rc01 - April 10, 2010
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libpng versions 0.97, January 1998, through 1.4.2rc02 - April 14, 2010
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Updated and distributed by Glenn Randers-Pehrson
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Copyright (c) 1998-2009 Glenn Randers-Pehrson
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@ -899,7 +899,7 @@ things.
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As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
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added. It expands the sample depth without changing tRNS to alpha.
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As of libpng version 1.4.2rc01, not all possible expansions are supported.
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As of libpng version 1.4.2rc02, not all possible expansions are supported.
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In the following table, the 01 means grayscale with depth<8, 31 means
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indexed with depth<8, other numerals represent the color type, "T" means
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@ -3105,6 +3105,11 @@ The png_zalloc() and png_zfree() functions are no longer exported.
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The png_zalloc() function no longer zeroes out the memory that it
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allocates.
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Support for dithering was removed by default, because it has never
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been well tested and doesn't work very well. The code has not
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been removed, however, and can be enabled by building libpng with
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PNG_READ_DITHER_SUPPORTED defined.
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We removed the trailing '.' from the warning and error messages.
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X. Detecting libpng
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@ -3245,13 +3250,13 @@ Other rules can be inferred by inspecting the libpng source.
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XIII. Y2K Compliance in libpng
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April 10, 2010
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April 14, 2010
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Since the PNG Development group is an ad-hoc body, we can't make
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an official declaration.
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This is your unofficial assurance that libpng from version 0.71 and
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upward through 1.4.2rc01 are Y2K compliant. It is my belief that earlier
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upward through 1.4.2rc02 are Y2K compliant. It is my belief that earlier
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versions were also Y2K compliant.
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Libpng only has three year fields. One is a 2-byte unsigned integer that
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25
libpng.3
25
libpng.3
@ -1,6 +1,6 @@
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.TH LIBPNG 3 "April 10, 2010"
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.TH LIBPNG 3 "April 14, 2010"
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.SH NAME
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libpng \- Portable Network Graphics (PNG) Reference Library 1.4.2rc01
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libpng \- Portable Network Graphics (PNG) Reference Library 1.4.2rc02
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.SH SYNOPSIS
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\fI\fB
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@ -785,7 +785,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
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.SH LIBPNG.TXT
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libpng.txt - A description on how to use and modify libpng
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libpng version 1.4.2rc01 - April 10, 2010
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libpng version 1.4.2rc02 - April 14, 2010
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Updated and distributed by Glenn Randers-Pehrson
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<glennrp at users.sourceforge.net>
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Copyright (c) 1998-2009 Glenn Randers-Pehrson
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@ -796,7 +796,7 @@ libpng.txt - A description on how to use and modify libpng
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Based on:
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libpng versions 0.97, January 1998, through 1.4.2rc01 - April 10, 2010
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libpng versions 0.97, January 1998, through 1.4.2rc02 - April 14, 2010
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Updated and distributed by Glenn Randers-Pehrson
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Copyright (c) 1998-2009 Glenn Randers-Pehrson
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@ -1684,7 +1684,7 @@ things.
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As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
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added. It expands the sample depth without changing tRNS to alpha.
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As of libpng version 1.4.2rc01, not all possible expansions are supported.
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As of libpng version 1.4.2rc02, not all possible expansions are supported.
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In the following table, the 01 means grayscale with depth<8, 31 means
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indexed with depth<8, other numerals represent the color type, "T" means
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@ -3890,6 +3890,11 @@ The png_zalloc() and png_zfree() functions are no longer exported.
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The png_zalloc() function no longer zeroes out the memory that it
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allocates.
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Support for dithering was removed by default, because it has never
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been well tested and doesn't work very well. The code has not
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been removed, however, and can be enabled by building libpng with
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PNG_READ_DITHER_SUPPORTED defined.
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We removed the trailing '.' from the warning and error messages.
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.SH X. Detecting libpng
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@ -4030,13 +4035,13 @@ Other rules can be inferred by inspecting the libpng source.
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.SH XIII. Y2K Compliance in libpng
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April 10, 2010
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April 14, 2010
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Since the PNG Development group is an ad-hoc body, we can't make
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an official declaration.
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This is your unofficial assurance that libpng from version 0.71 and
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upward through 1.4.2rc01 are Y2K compliant. It is my belief that earlier
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upward through 1.4.2rc02 are Y2K compliant. It is my belief that earlier
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versions were also Y2K compliant.
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Libpng only has three year fields. One is a 2-byte unsigned integer that
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@ -4270,7 +4275,7 @@ possible without all of you.
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Thanks to Frank J. T. Wojcik for helping with the documentation.
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Libpng version 1.4.2rc01 - April 10, 2010:
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Libpng version 1.4.2rc02 - April 14, 2010:
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Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
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Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
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@ -4293,7 +4298,7 @@ this sentence.
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This code is released under the libpng license.
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libpng versions 1.2.6, August 15, 2004, through 1.4.2rc01, April 10, 2010, are
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libpng versions 1.2.6, August 15, 2004, through 1.4.2rc02, April 14, 2010, are
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Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
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distributed according to the same disclaimer and license as libpng-1.2.5
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with the following individual added to the list of Contributing Authors
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@ -4392,7 +4397,7 @@ certification mark of the Open Source Initiative.
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Glenn Randers-Pehrson
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glennrp at users.sourceforge.net
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April 10, 2010
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April 14, 2010
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.\" end of man page
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@ -1,7 +1,7 @@
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/* pngrtran.c - transforms the data in a row for PNG readers
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*
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* Last changed in libpng 1.4.1 [April 10, 2010]
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* Last changed in libpng 1.4.1 [April 14, 2010]
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* Copyright (c) 1998-2010 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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@ -536,7 +536,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
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png_free(png_ptr, distance);
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}
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}
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#endif
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#endif /* PNG_READ_DITHER_SUPPORTED */
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#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
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/* Transform the image from the file_gamma to the screen_gamma. We
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