diff options
| -rw-r--r-- | LICENSE | 4 | ||||
| -rw-r--r-- | README | 2 | ||||
| -rw-r--r-- | libpng-manual.txt | 53 | ||||
| -rw-r--r-- | libpng.3 | 61 | ||||
| -rw-r--r-- | libpngpf.3 | 2 | ||||
| -rw-r--r-- | png.5 | 2 | ||||
| -rw-r--r-- | png.h | 10 | ||||
| -rw-r--r-- | pngconf.h | 2 | ||||
| -rw-r--r-- | projects/vstudio/readme.txt | 2 | ||||
| -rw-r--r-- | projects/vstudio/zlib.props | 2 | ||||
| -rw-r--r-- | scripts/README.txt | 2 |
11 files changed, 78 insertions, 64 deletions
@@ -10,7 +10,7 @@ this sentence. This code is released under the libpng license. -libpng versions 1.2.6, August 15, 2004, through 1.5.5beta07, August 26, 2011, are +libpng versions 1.2.6, August 15, 2004, through 1.5.5beta07, September 8, 2011, are Copyright (c) 2004, 2006-2011 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 @@ -108,4 +108,4 @@ certification mark of the Open Source Initiative. Glenn Randers-Pehrson glennrp at users.sourceforge.net -August 26, 2011 +September 8, 2011 @@ -1,4 +1,4 @@ -README for libpng version 1.5.5beta07 - August 26, 2011 (shared library 15.0) +README for libpng version 1.5.5beta07 - September 8, 2011 (shared library 15.0) See the note about version numbers near the top of png.h See INSTALL for instructions on how to install libpng. diff --git a/libpng-manual.txt b/libpng-manual.txt index 2175339ab..996a4f7f1 100644 --- a/libpng-manual.txt +++ b/libpng-manual.txt @@ -1,6 +1,6 @@ libpng-manual.txt - A description on how to use and modify libpng - libpng version 1.5.5beta07 - August 26, 2011 + libpng version 1.5.5beta07 - September 8, 2011 Updated and distributed by Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Copyright (c) 1998-2011 Glenn Randers-Pehrson @@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng Based on: - libpng versions 0.97, January 1998, through 1.5.5beta07 - August 26, 2011 + libpng versions 0.97, January 1998, through 1.5.5beta07 - September 8, 2011 Updated and distributed by Glenn Randers-Pehrson Copyright (c) 1998-2011 Glenn Randers-Pehrson @@ -691,7 +691,7 @@ or you can use the fixed point equivalent: png_set_gamma_fixed(png_ptr, PNG_FP_1*screen_gamma, PNG_FP_1/screen_gamma); -If you don't know the gamma for you system it is probably 2.2 - a good +If you don't know the gamma for your system it is probably 2.2 - a good approximation to the IEC standard for display systems (sRGB). If images are too contrasty or washed out you got the value wrong - check your system documentation! @@ -720,16 +720,18 @@ channel. To display these files correctly you need to compose the data onto a suitable background, as described in the PNG specification. Libpng only supports composing onto a single color (using png_set_background; -see below.) Otherwise you must do the composition yourself and, in this case, +see below). Otherwise you must do the composition yourself and, in this case, you may need to call png_set_alpha_mode: #if PNG_LIBPNG_VER >= 10504 png_set_alpha_mode(png_ptr, mode, screen_gamma); +#else + png_set_gamma(png_ptr, screen_gamma, 1.0/screen_gamma); #endif -The screen_gamma value is the same as the argument to png_set_gamma, however how -it affects the output depends on the mode. png_set_alpha_mode() sets the file -gamma default to 1/screen_gamma, so normally you don't need to call +The screen_gamma value is the same as the argument to png_set_gamma; however, +how it affects the output depends on the mode. png_set_alpha_mode() sets the +file gamma default to 1/screen_gamma, so normally you don't need to call png_set_gamma. If you need different defaults call png_set_gamma() before png_set_alpha_mode() - if you call it after it will override the settings made by png_set_alpha_mode(). @@ -756,10 +758,11 @@ scaled, linear encoded, pre-multiplied component values must be used! The remaining modes assume you don't need to do any further color correction or -that if you do your color correction software knows all about alpha (it +that if you do, your color correction software knows all about alpha (it probably doesn't!) - PNG_ALPHA_STANDARD: The data libpng produces is encoded in the standard way + PNG_ALPHA_STANDARD: The data libpng produces +is encoded in the standard way assumed by most correctly written graphics software. The gamma encoding will be removed by libpng and the linear component values will be pre-multiplied by the @@ -789,7 +792,8 @@ dynamic range. To avoid problems, and if your software supports it, use png_set_expand_16() to force all components to 16 bits. - PNG_ALPHA_OPTIMIZED: This mode is the same as PNG_ALPHA_STANDARD except that + PNG_ALPHA_OPTIMIZED: This mode is the same +as PNG_ALPHA_STANDARD except that completely opaque pixels are gamma encoded according to the screen_gamma value. Pixels with alpha less than 1.0 will still have linear components. @@ -809,10 +813,11 @@ representation of non-opaque pixels are irrelevant. You can also try this format if your software is broken; it might look better. - PNG_ALPHA_BROKEN: This is PNG_ALPHA_STANDARD however all component values, + PNG_ALPHA_BROKEN: This is PNG_ALPHA_STANDARD; +however, all component values, including the alpha channel are gamma encoded. This is an appropriate format to try if your software, or more -likely hardware, is totally broken: if it performs +likely hardware, is totally broken, i.e., if it performs linear arithmetic directly on gamma encoded values. In most cases of broken software or hardware the bug in the final display @@ -828,14 +833,14 @@ them, there are three recommended ways of using png_set_alpha_mode(): screen_gamma); You can do color correction on the result (libpng does not currently -support color correction internally.) When you handle the alpha channel +support color correction internally). When you handle the alpha channel you need to undo the gamma encoding and multiply out the alpha. png_set_alpha_mode(png_ptr, PNG_ALPHA_STANDARD, screen_gamma); png_set_expand_16(png_ptr); -If you are using the high level interface don't call png_set_expand_16(); +If you are using the high level interface, don't call png_set_expand_16(); instead pass PNG_TRANSFORM_EXPAND_16 to the interface. With this mode you can't do color correction, but you can do arithmetic, @@ -847,7 +852,7 @@ including composition and scaling, on the data without further processing. You can avoid the expansion to 16-bit components with this mode, but you lose the ability to scale the image or perform other linear arithmetic. All you can do is compose the result onto a matching output. Since this -mode is libpng specific you also need to write your own composition +mode is libpng-specific you also need to write your own composition software. If you don't need, or can't handle, the alpha channel you can call @@ -860,7 +865,7 @@ transparent parts of this image. The background_color is an RGB or grayscale value according to the data format libpng will produce for you. Because you don't yet know the format of the PNG -file if you call png_set_background at this point you must arrange for the +file, if you call png_set_background at this point you must arrange for the format produced by libpng to always have 8-bit or 16-bit components and then store the color as an 8-bit or 16-bit color as appropriate. The color contains separate gray and RGB component values, so you can let libpng produce gray or @@ -2101,7 +2106,7 @@ to load the whole file into memory when it is interlaced. libpng includes a test program, pngvalid, that illustrates reading and writing of interlaced images. If you can't get interlacing to work in your -code and don't want to leave it to libpng (the recommended approach) see +code and don't want to leave it to libpng (the recommended approach), see how pngvalid.c does it. Finishing a sequential read @@ -3909,6 +3914,9 @@ The number libpng_vn is constructed from the major version, minor version with leading zero, and release number with leading zero, (e.g., libpng_vn for version 1.0.7 is 10007). +Note that this function does not take a png_ptr, so you can call it +before you've created one. + You can also check which version of png.h you used when compiling your application: @@ -4145,10 +4153,9 @@ In png_get_iCCP, the type of "profile" was changed from png_charpp to png_bytepp, and in png_set_iCCP, from png_charp to png_const_bytep. There are changes of form in png.h, including new and changed macros to -declare -parts of the API. Some API functions with arguments that are pointers to -data not modified within the function have been corrected to declare -these arguments with PNG_CONST. +declare parts of the API. Some API functions with arguments that are +pointers to data not modified within the function have been corrected to +declare these arguments with PNG_CONST. Much of the internal use of C macros to control the library build has also changed and some of this is visible in the exported header files, in @@ -4222,7 +4229,7 @@ Applications can now choose whether to use these macros or to call the corresponding function by defining PNG_USE_READ_MACROS or PNG_NO_USE_READ_MACROS before including png.h. Notice that this is only supported from 1.5.0 -defining PNG_NO_USE_READ_MACROS prior to 1.5.0 - will lead to a link failure. +will lead to a link failure. Prior to libpng-1.5.4, the zlib compressor used the same set of parameters when compressing the IDAT data and textual data such as zTXt and iCCP. @@ -4553,7 +4560,7 @@ Other rules can be inferred by inspecting the libpng source. XIV. Y2K Compliance in libpng -August 26, 2011 +September 8, 2011 Since the PNG Development group is an ad-hoc body, we can't make an official declaration. @@ -1,4 +1,4 @@ -.TH LIBPNG 3 "August 26, 2011" +.TH LIBPNG 3 "September 8, 2011" .SH NAME libpng \- Portable Network Graphics (PNG) Reference Library 1.5.5beta07 .SH SYNOPSIS @@ -977,7 +977,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng. .SH LIBPNG.TXT libpng-manual.txt - A description on how to use and modify libpng - libpng version 1.5.5beta07 - August 26, 2011 + libpng version 1.5.5beta07 - September 8, 2011 Updated and distributed by Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Copyright (c) 1998-2011 Glenn Randers-Pehrson @@ -988,7 +988,7 @@ libpng-manual.txt - A description on how to use and modify libpng Based on: - libpng versions 0.97, January 1998, through 1.5.5beta07 - August 26, 2011 + libpng versions 0.97, January 1998, through 1.5.5beta07 - September 8, 2011 Updated and distributed by Glenn Randers-Pehrson Copyright (c) 1998-2011 Glenn Randers-Pehrson @@ -1668,7 +1668,7 @@ or you can use the fixed point equivalent: png_set_gamma_fixed(png_ptr, PNG_FP_1*screen_gamma, PNG_FP_1/screen_gamma); -If you don't know the gamma for you system it is probably 2.2 - a good +If you don't know the gamma for your system it is probably 2.2 - a good approximation to the IEC standard for display systems (sRGB). If images are too contrasty or washed out you got the value wrong - check your system documentation! @@ -1697,16 +1697,18 @@ channel. To display these files correctly you need to compose the data onto a suitable background, as described in the PNG specification. Libpng only supports composing onto a single color (using png_set_background; -see below.) Otherwise you must do the composition yourself and, in this case, +see below). Otherwise you must do the composition yourself and, in this case, you may need to call png_set_alpha_mode: #if PNG_LIBPNG_VER >= 10504 png_set_alpha_mode(png_ptr, mode, screen_gamma); +#else + png_set_gamma(png_ptr, screen_gamma, 1.0/screen_gamma); #endif -The screen_gamma value is the same as the argument to png_set_gamma, however how -it affects the output depends on the mode. png_set_alpha_mode() sets the file -gamma default to 1/screen_gamma, so normally you don't need to call +The screen_gamma value is the same as the argument to png_set_gamma; however, +how it affects the output depends on the mode. png_set_alpha_mode() sets the +file gamma default to 1/screen_gamma, so normally you don't need to call png_set_gamma. If you need different defaults call png_set_gamma() before png_set_alpha_mode() - if you call it after it will override the settings made by png_set_alpha_mode(). @@ -1733,10 +1735,11 @@ scaled, linear encoded, pre-multiplied component values must be used! The remaining modes assume you don't need to do any further color correction or -that if you do your color correction software knows all about alpha (it +that if you do, your color correction software knows all about alpha (it probably doesn't!) - PNG_ALPHA_STANDARD: The data libpng produces is encoded in the standard way + PNG_ALPHA_STANDARD: The data libpng produces +is encoded in the standard way assumed by most correctly written graphics software. The gamma encoding will be removed by libpng and the linear component values will be pre-multiplied by the @@ -1766,7 +1769,8 @@ dynamic range. To avoid problems, and if your software supports it, use png_set_expand_16() to force all components to 16 bits. - PNG_ALPHA_OPTIMIZED: This mode is the same as PNG_ALPHA_STANDARD except that + PNG_ALPHA_OPTIMIZED: This mode is the same +as PNG_ALPHA_STANDARD except that completely opaque pixels are gamma encoded according to the screen_gamma value. Pixels with alpha less than 1.0 will still have linear components. @@ -1786,10 +1790,11 @@ representation of non-opaque pixels are irrelevant. You can also try this format if your software is broken; it might look better. - PNG_ALPHA_BROKEN: This is PNG_ALPHA_STANDARD however all component values, + PNG_ALPHA_BROKEN: This is PNG_ALPHA_STANDARD; +however, all component values, including the alpha channel are gamma encoded. This is an appropriate format to try if your software, or more -likely hardware, is totally broken: if it performs +likely hardware, is totally broken, i.e., if it performs linear arithmetic directly on gamma encoded values. In most cases of broken software or hardware the bug in the final display @@ -1805,14 +1810,14 @@ them, there are three recommended ways of using png_set_alpha_mode(): screen_gamma); You can do color correction on the result (libpng does not currently -support color correction internally.) When you handle the alpha channel +support color correction internally). When you handle the alpha channel you need to undo the gamma encoding and multiply out the alpha. png_set_alpha_mode(png_ptr, PNG_ALPHA_STANDARD, screen_gamma); png_set_expand_16(png_ptr); -If you are using the high level interface don't call png_set_expand_16(); +If you are using the high level interface, don't call png_set_expand_16(); instead pass PNG_TRANSFORM_EXPAND_16 to the interface. With this mode you can't do color correction, but you can do arithmetic, @@ -1824,7 +1829,7 @@ including composition and scaling, on the data without further processing. You can avoid the expansion to 16-bit components with this mode, but you lose the ability to scale the image or perform other linear arithmetic. All you can do is compose the result onto a matching output. Since this -mode is libpng specific you also need to write your own composition +mode is libpng-specific you also need to write your own composition software. If you don't need, or can't handle, the alpha channel you can call @@ -1837,7 +1842,7 @@ transparent parts of this image. The background_color is an RGB or grayscale value according to the data format libpng will produce for you. Because you don't yet know the format of the PNG -file if you call png_set_background at this point you must arrange for the +file, if you call png_set_background at this point you must arrange for the format produced by libpng to always have 8-bit or 16-bit components and then store the color as an 8-bit or 16-bit color as appropriate. The color contains separate gray and RGB component values, so you can let libpng produce gray or @@ -3078,7 +3083,7 @@ to load the whole file into memory when it is interlaced. libpng includes a test program, pngvalid, that illustrates reading and writing of interlaced images. If you can't get interlacing to work in your -code and don't want to leave it to libpng (the recommended approach) see +code and don't want to leave it to libpng (the recommended approach), see how pngvalid.c does it. .SS Finishing a sequential read @@ -4887,6 +4892,9 @@ The number libpng_vn is constructed from the major version, minor version with leading zero, and release number with leading zero, (e.g., libpng_vn for version 1.0.7 is 10007). +Note that this function does not take a png_ptr, so you can call it +before you've created one. + You can also check which version of png.h you used when compiling your application: @@ -5123,10 +5131,9 @@ In png_get_iCCP, the type of "profile" was changed from png_charpp to png_bytepp, and in png_set_iCCP, from png_charp to png_const_bytep. There are changes of form in png.h, including new and changed macros to -declare -parts of the API. Some API functions with arguments that are pointers to -data not modified within the function have been corrected to declare -these arguments with PNG_CONST. +declare parts of the API. Some API functions with arguments that are +pointers to data not modified within the function have been corrected to +declare these arguments with PNG_CONST. Much of the internal use of C macros to control the library build has also changed and some of this is visible in the exported header files, in @@ -5200,7 +5207,7 @@ Applications can now choose whether to use these macros or to call the corresponding function by defining PNG_USE_READ_MACROS or PNG_NO_USE_READ_MACROS before including png.h. Notice that this is only supported from 1.5.0 -defining PNG_NO_USE_READ_MACROS prior to 1.5.0 - will lead to a link failure. +will lead to a link failure. Prior to libpng-1.5.4, the zlib compressor used the same set of parameters when compressing the IDAT data and textual data such as zTXt and iCCP. @@ -5531,7 +5538,7 @@ Other rules can be inferred by inspecting the libpng source. .SH XIV. Y2K Compliance in libpng -August 26, 2011 +September 8, 2011 Since the PNG Development group is an ad-hoc body, we can't make an official declaration. @@ -5790,7 +5797,7 @@ possible without all of you. Thanks to Frank J. T. Wojcik for helping with the documentation. -Libpng version 1.5.5beta07 - August 26, 2011: +Libpng version 1.5.5beta07 - September 8, 2011: Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc. Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net). @@ -5813,7 +5820,7 @@ this sentence. This code is released under the libpng license. -libpng versions 1.2.6, August 15, 2004, through 1.5.5beta07, August 26, 2011, are +libpng versions 1.2.6, August 15, 2004, through 1.5.5beta07, September 8, 2011, are Copyright (c) 2004,2006-2007 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 @@ -5912,7 +5919,7 @@ certification mark of the Open Source Initiative. Glenn Randers-Pehrson glennrp at users.sourceforge.net -August 26, 2011 +September 8, 2011 .\" end of man page diff --git a/libpngpf.3 b/libpngpf.3 index 9ecc4b5d9..a49e9ffac 100644 --- a/libpngpf.3 +++ b/libpngpf.3 @@ -1,4 +1,4 @@ -.TH LIBPNGPF 3 "August 26, 2011" +.TH LIBPNGPF 3 "September 8, 2011" .SH NAME libpng \- Portable Network Graphics (PNG) Reference Library 1.5.5beta07 (private functions) @@ -1,4 +1,4 @@ -.TH PNG 5 "August 26, 2011" +.TH PNG 5 "September 8, 2011" .SH NAME png \- Portable Network Graphics (PNG) format .SH DESCRIPTION @@ -1,7 +1,7 @@ /* png.h - header file for PNG reference library * - * libpng version 1.5.5beta07 - August 26, 2011 + * libpng version 1.5.5beta07 - September 8, 2011 * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) @@ -11,7 +11,7 @@ * Authors and maintainers: * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger - * libpng versions 0.97, January 1998, through 1.5.5beta07 - August 26, 2011: Glenn + * libpng versions 0.97, January 1998, through 1.5.5beta07 - September 8, 2011: Glenn * See also "Contributing Authors", below. * * Note about libpng version numbers: @@ -189,7 +189,7 @@ * * This code is released under the libpng license. * - * libpng versions 1.2.6, August 15, 2004, through 1.5.5beta07, August 26, 2011, are + * libpng versions 1.2.6, August 15, 2004, through 1.5.5beta07, September 8, 2011, are * Copyright (c) 2004, 2006-2011 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: @@ -301,7 +301,7 @@ * Y2K compliance in libpng: * ========================= * - * August 26, 2011 + * September 8, 2011 * * Since the PNG Development group is an ad-hoc body, we can't make * an official declaration. @@ -364,7 +364,7 @@ /* Version information for png.h - this should match the version in png.c */ #define PNG_LIBPNG_VER_STRING "1.5.5beta07" #define PNG_HEADER_VERSION_STRING \ - " libpng version 1.5.5beta07 - August 26, 2011\n" + " libpng version 1.5.5beta07 - September 8, 2011\n" #define PNG_LIBPNG_VER_SONUM 15 #define PNG_LIBPNG_VER_DLLNUM 15 @@ -1,7 +1,7 @@ /* pngconf.h - machine configurable file for libpng * - * libpng version 1.5.5beta07 - August 26, 2011 + * libpng version 1.5.5beta07 - September 8, 2011 * * Copyright (c) 1998-2011 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt index f699cfa94..991057921 100644 --- a/projects/vstudio/readme.txt +++ b/projects/vstudio/readme.txt @@ -1,7 +1,7 @@ VisualStudio instructions -libpng version 1.5.5beta07 - August 26, 2011 +libpng version 1.5.5beta07 - September 8, 2011 Copyright (c) 1998-2010 Glenn Randers-Pehrson diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props index 7e4fc9ea7..a476b2a9a 100644 --- a/projects/vstudio/zlib.props +++ b/projects/vstudio/zlib.props @@ -2,7 +2,7 @@ <!-- * zlib.props - location of zlib source * - * libpng version 1.5.5beta07 - August 29, 2011 + * libpng version 1.5.5beta07 - September 8, 2011 * * Copyright (c) 1998-2011 Glenn Randers-Pehrson * diff --git a/scripts/README.txt b/scripts/README.txt index c9729df31..b34687fa7 100644 --- a/scripts/README.txt +++ b/scripts/README.txt @@ -1,5 +1,5 @@ -Makefiles for libpng version 1.5.5beta07 - August 26, 2011 +Makefiles for libpng version 1.5.5beta07 - September 8, 2011 pnglibconf.h.prebuilt => Stores configuration settings makefile.linux => Linux/ELF makefile |