diff options
author | Glenn Randers-Pehrson <glennrp at users.sourceforge.net> | 2009-09-30 23:05:16 -0500 |
---|---|---|
committer | Glenn Randers-Pehrson <glennrp at users.sourceforge.net> | 2009-09-30 23:14:24 -0500 |
commit | 455e8a42810b5906c9f6edb4d3de15e54ab59d05 (patch) | |
tree | 22042a4abc23f8bcb24c86b8561dc862e0b0d532 /libpng.3 | |
parent | 5d7fe7a71823bb6eef1929e31de69a427e11c7a5 (diff) | |
download | libpng-455e8a42810b5906c9f6edb4d3de15e54ab59d05.tar.gz |
[master] Imported from libpng-1.2.41beta03.tarv1.2.41beta03
Diffstat (limited to 'libpng.3')
-rw-r--r-- | libpng.3 | 65 |
1 files changed, 40 insertions, 25 deletions
@@ -1,4 +1,4 @@ -.TH LIBPNG 3 "September 30, 2009" +.TH LIBPNG 3 "October 1, 2009" .SH NAME libpng \- Portable Network Graphics (PNG) Reference Library 1.2.41beta03 .SH SYNOPSIS @@ -821,7 +821,7 @@ Following is a copy of the libpng.txt file that accompanies libpng. .SH LIBPNG.TXT libpng.txt - A description on how to use and modify libpng - libpng version 1.2.41beta03 - September 30, 2009 + libpng version 1.2.41beta03 - October 1, 2009 Updated and distributed by Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Copyright (c) 1998-2009 Glenn Randers-Pehrson @@ -832,7 +832,7 @@ libpng.txt - A description on how to use and modify libpng Based on: - libpng versions 0.97, January 1998, through 1.2.41beta03 - September 30, 2009 + libpng versions 0.97, January 1998, through 1.2.41beta03 - October 1, 2009 Updated and distributed by Glenn Randers-Pehrson Copyright (c) 1998-2009 Glenn Randers-Pehrson @@ -1366,10 +1366,33 @@ in until png_read_end() has read the chunk data following the image. for PNG 1.0) interlace_type - (PNG_INTERLACE_NONE or PNG_INTERLACE_ADAM7) - Any or all of interlace_type, compression_type, of + + Any or all of interlace_type, compression_type, or filter_method can be NULL if you are not interested in their values. + Note that png_get_IHDR() returns 32-bit data into + the application's width and height variables. + This is an unsafe situation if these are 16-bit + variables. In such situations, the + png_get_image_width() and png_get_image_height() + functions described below are safer. + + width = png_get_image_width(png_ptr, + info_ptr); + height = png_get_image_height(png_ptr, + info_ptr); + bit_depth = png_get_bit_depth(png_ptr, + info_ptr); + color_type = png_get_color_type(png_ptr, + info_ptr); + filter_method = png_get_filter_type(png_ptr, + info_ptr); + compression_type = png_get_compression_type(png_ptr, + info_ptr); + interlace_type = png_get_interlace_type(png_ptr, + info_ptr); + channels = png_get_channels(png_ptr, info_ptr); channels - number of channels of info for the color type (valid values are 1 (GRAY, @@ -1389,23 +1412,6 @@ in until png_read_end() has read the chunk data following the image. be in signature[4] through signature[7] (see png_set_sig_bytes())). - - width = png_get_image_width(png_ptr, - info_ptr); - height = png_get_image_height(png_ptr, - info_ptr); - bit_depth = png_get_bit_depth(png_ptr, - info_ptr); - color_type = png_get_color_type(png_ptr, - info_ptr); - filter_method = png_get_filter_type(png_ptr, - info_ptr); - compression_type = png_get_compression_type(png_ptr, - info_ptr); - interlace_type = png_get_interlace_type(png_ptr, - info_ptr); - - These are also important, but their validity depends on whether the chunk has been read. The png_get_valid(png_ptr, info_ptr, PNG_INFO_<chunk>) and png_get_<chunk>(png_ptr, info_ptr, ...) functions return non-zero if the @@ -3803,6 +3809,15 @@ We use 3-space indentation, except for continued statements which are usually indented the same as the first line of the statement plus four more spaces. +For macro definitions we use 2-space indentation, always leaving the "#" +in the first column. + + #ifndef PNG_NO_FEATURE + # ifndef PNG_FEATURE_SUPPORTED + # define PNG_FEATURE_SUPPORTED + # endif + #endif + Comments appear with the leading "/*" at the same indentation as the statement that follows the comment: @@ -3879,7 +3894,7 @@ source. .SH XIII. Y2K Compliance in libpng -September 30, 2009 +October 1, 2009 Since the PNG Development group is an ad-hoc body, we can't make an official declaration. @@ -4225,7 +4240,7 @@ possible without all of you. Thanks to Frank J. T. Wojcik for helping with the documentation. -Libpng version 1.2.41beta03 - September 30, 2009: +Libpng version 1.2.41beta03 - October 1, 2009: Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc. Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net). @@ -4248,7 +4263,7 @@ this sentence. This code is released under the libpng license. -libpng versions 1.2.6, August 15, 2004, through 1.2.41beta03, September 30, 2009, are +libpng versions 1.2.6, August 15, 2004, through 1.2.41beta03, October 1, 2009, are Copyright (c) 2004,2006-2008 Glenn Randers-Pehrson, and are distributed according to the same disclaimer and license as libpng-1.2.5 with the following individual added to the list of Contributing Authors @@ -4347,7 +4362,7 @@ certification mark of the Open Source Initiative. Glenn Randers-Pehrson glennrp at users.sourceforge.net -September 30, 2009 +October 1, 2009 .\" end of man page |