Update the documentation
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Cosmin Truta
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README
84
README
@ -4,12 +4,12 @@ See the note about version numbers near the top of png.h.
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See INSTALL for instructions on how to install libpng.
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See INSTALL for instructions on how to install libpng.
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Libpng comes in several distribution formats. Get libpng-*.tar.gz or
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Libpng comes in several distribution formats. Get libpng-*.tar.gz or
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libpng-*.tar.xz or if you want UNIX-style line endings in the text files,
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libpng-*.tar.xz or if you want UNIX-style line endings in the text
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or lpng*.7z or lpng*.zip if you want DOS-style line endings.
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files, or lpng*.7z or lpng*.zip if you want DOS-style line endings.
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Version 0.89 was the first official release of libpng. Don't let the
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Version 0.89 was the first official release of libpng. Don't let the
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fact that it's the first release fool you. The libpng library has been in
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fact that it's the first release fool you. The libpng library has been
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extensive use and testing since mid-1995. By late 1997 it had
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in extensive use and testing since mid-1995. By late 1997 it had
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finally gotten to the stage where there hadn't been significant
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finally gotten to the stage where there hadn't been significant
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changes to the API in some time, and people have a bad feeling about
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changes to the API in some time, and people have a bad feeling about
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libraries with versions < 1.0. Version 1.0.0 was released in
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libraries with versions < 1.0. Version 1.0.0 was released in
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@ -60,84 +60,48 @@ the library action on the detection of chunk CRC errors. It is possible
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to set different actions based on whether the CRC error occurred in a
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to set different actions based on whether the CRC error occurred in a
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critical or an ancillary chunk.
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critical or an ancillary chunk.
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The changes made to the library, and bugs fixed are based on discussions
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For a detailed description on using libpng, read libpng-manual.txt.
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on the PNG-implement mailing list and not on material submitted
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For examples of libpng in a program, see example.c and pngtest.c. For
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privately to Guy, Andreas, or Glenn. They will forward any good
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usage information and restrictions (what little they are) on libpng,
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suggestions to the list.
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see png.h. For a description on using zlib (the compression library
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used by libpng) and zlib's restrictions, see zlib.h
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For a detailed description on using libpng, read libpng-manual.txt. For
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examples of libpng in a program, see example.c and pngtest.c. For usage
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information and restrictions (what little they are) on libpng, see
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png.h. For a description on using zlib (the compression library used by
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libpng) and zlib's restrictions, see zlib.h
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I have included a general makefile, as well as several machine and
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I have included a general makefile, as well as several machine and
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compiler specific ones, but you may have to modify one for your own needs.
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compiler specific ones, but you may have to modify one for your own
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needs.
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You should use zlib 1.0.4 or later to run this, but it MAY work with
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You should use zlib 1.0.4 or later to run this, but it MAY work with
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versions as old as zlib 0.95. Even so, there are bugs in older zlib
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versions as old as zlib 0.95. Even so, there are bugs in older zlib
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versions which can cause the output of invalid compression streams for
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versions which can cause the output of invalid compression streams for
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some images. You will definitely need zlib 1.0.4 or later if you are
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some images.
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taking advantage of the MS-DOS "far" structure allocation for the small
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and medium memory models. You should also note that zlib is a
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compression library that is useful for more things than just PNG files.
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You can use zlib as a drop-in replacement for fread() and fwrite() if
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you are so inclined.
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zlib should be available at the same place that libpng is, or at zlib.net.
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You should also note that zlib is a compression library that is useful
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for more things than just PNG files. You can use zlib as a drop-in
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replacement for fread() and fwrite(), if you are so inclined.
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zlib should be available at the same place that libpng is, or at
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https://zlib.net.
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You may also want a copy of the PNG specification. It is available
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You may also want a copy of the PNG specification. It is available
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as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find
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as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find
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these at http://www.libpng.org/pub/png/pngdocs.html .
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these at http://www.libpng.org/pub/png/pngdocs.html .
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This code is currently being archived at libpng.sourceforge.io in the
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This code is currently being archived at libpng.sourceforge.io in the
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[DOWNLOAD] area, and at http://libpng.download/src . If you
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[DOWNLOAD] area, and at http://libpng.download/src .
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can't find it in any of those places, e-mail me, and I'll help you find it.
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I am not a lawyer, but I believe that the Export Control Classification
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Number (ECCN) for libpng is EAR99, which means not subject to export
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controls or International Traffic in Arms Regulations (ITAR) because it
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is open source, publicly available software, that does not contain any
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encryption software. See the EAR, paragraphs 734.3(b)(3) and 734.7(b).
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If you have any code changes, requests, problems, etc., please e-mail
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them to me. Also, I'd appreciate any make files or project files,
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and any modifications you needed to make to get libpng to compile,
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along with a #define variable to tell what compiler/system you are on.
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If you needed to add transformations to libpng, or wish libpng would
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provide the image in a different way, drop me a note (and code, if
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possible), so I can consider supporting the transformation.
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Finally, if you get any warning messages when compiling libpng
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(note: not zlib), and they are easy to fix, I'd appreciate the
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fix. Please mention "libpng" somewhere in the subject line. Thanks.
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This release was created and will be supported by myself (of course
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This release was created and will be supported by myself (of course
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based in a large way on Guy's and Andreas' earlier work), and the PNG
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based in a large way on Glenn's, Guy's and Andreas' earlier work), and
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development group.
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the PNG development group.
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Send comments/corrections/commendations to png-mng-implement at
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Send comments/corrections/commendations to png-mng-implement at
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lists.sourceforge.net (subscription required; visit
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lists.sourceforge.net (subscription required; visit
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https://lists.sourceforge.net/lists/listinfo/png-mng-implement
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https://lists.sourceforge.net/lists/listinfo/png-mng-implement
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to subscribe).
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to subscribe).
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You can't reach Guy, the original libpng author, at the addresses
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Send general questions about the PNG specification to png-mng-misc
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given in previous versions of this document. He and Andreas will
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at lists.sourceforge.net (subscription required; visit
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read mail addressed to the png-implement list, however.
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Please do not send general questions about PNG. Send them to
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png-mng-misc at lists.sf.net (subscription required; visit
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https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
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https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
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subscribe). If you have a question about something
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subscribe).
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in the PNG specification that is related to using libpng, send it
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to me. Send me any questions that start with "I was using libpng,
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and ...". If in doubt, send questions to me. I'll bounce them
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to others, if necessary.
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Please do not send suggestions on how to change PNG. We have
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been discussing PNG for twenty years now, and it is official and
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finished. If you have suggestions for libpng, however, I'll
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gladly listen. Even if your suggestion is not used immediately,
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it may be used later.
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Files in this distribution:
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Files in this distribution:
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49
TODO
49
TODO
@ -1,30 +1,23 @@
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/*
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TODO - list of things to do for libpng:
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TODO - list of things to do for libpng:
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Final bug fixes.
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* Fix all defects (duh!)
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Better C++ wrapper/full C++ implementation?
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* Better C++ wrapper / full C++ implementation (?)
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Fix problem with C++ and EXTERN "C".
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* Fix the problems with C++ and 'extern "C"'.
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cHRM transformation.
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* cHRM transformation.
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Remove setjmp/longjmp usage in favor of returning error codes. As a start on
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* Palette creation.
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this, minimize the use of png_error(), replacing them with
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* "grayscale->palette" transformation and "palette->grayscale" detection.
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png_warning(); return(0); or similar.
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* Improved dithering.
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Palette creation.
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* Multi-lingual error and warning message support.
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Add "grayscale->palette" transformation and "palette->grayscale" detection.
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* Complete sRGB transformation. (Currently it simply uses gamma=0.45455.)
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Improved dithering.
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* Man pages for function calls.
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Multi-lingual error and warning message support.
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* Better documentation.
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Complete sRGB transformation (presently it simply uses gamma=0.45455).
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* Better filter selection
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Man pages for function calls.
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(e.g., counting huffman bits/precompression; filter inertia; filter costs).
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Better documentation.
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* Histogram creation.
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Better filter selection
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* Text conversion between different code pages (e.g., Latin-1 -> Mac).
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(counting huffman bits/precompression? filter inertia? filter costs?).
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* Avoid building gamma tables whenever possible.
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Histogram creation.
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* Greater precision in changing to linear gamma for compositing against
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Text conversion between different code pages (Latin-1 -> Mac and DOS).
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background, and in doing rgb-to-gray transformations.
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Avoid building gamma tables whenever possible.
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* Investigate pre-incremented loop counters and other loop constructions.
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Use greater precision when changing to linear gamma for compositing against
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* Interpolated method of handling interlacing.
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background and doing rgb-to-gray transformation.
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* More validations for libpng transformations.
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Investigate pre-incremented loop counters and other loop constructions.
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Add interpolated method of handling interlacing.
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Extend pngvalid.c to validate more of the libpng transformations.
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Refactor preprocessor conditionals to compile entire statements
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*/
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@ -1,7 +1,6 @@
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libpng-manual.txt - A description on how to use and modify libpng
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libpng-manual.txt - A description on how to use and modify libpng
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libpng version 1.6.35 - July 15, 2018
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Copyright (c) 2018 Cosmin Truta
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Updated and distributed by Glenn Randers-Pehrson
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Copyright (c) 1998-2018 Glenn Randers-Pehrson
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Copyright (c) 1998-2018 Glenn Randers-Pehrson
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This document is released under the libpng license.
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This document is released under the libpng license.
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@ -12,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
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libpng versions 0.97, January 1998, through 1.6.35 - July 15, 2018
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libpng versions 0.97, January 1998, through 1.6.35 - July 15, 2018
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Updated and distributed by Glenn Randers-Pehrson
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Updated and distributed by Glenn Randers-Pehrson
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Copyright (c) 1998-2017 Glenn Randers-Pehrson
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Copyright (c) 1998-2018 Glenn Randers-Pehrson
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libpng 1.0 beta 6 - version 0.96 - May 28, 1997
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libpng 1.0 beta 6 - version 0.96 - May 28, 1997
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Updated and distributed by Andreas Dilger
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Updated and distributed by Andreas Dilger
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@ -44,7 +43,6 @@ libpng-manual.txt - A description on how to use and modify libpng
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XIII. Detecting libpng
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XIII. Detecting libpng
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XIV. Source code repository
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XIV. Source code repository
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XV. Coding style
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XV. Coding style
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XVI. Y2K Compliance in libpng
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I. Introduction
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I. Introduction
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@ -4520,7 +4518,7 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
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having level = 0 will be printed. There aren't any such statements in
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having level = 0 will be printed. There aren't any such statements in
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this version of libpng, but if you insert some they will be printed.
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this version of libpng, but if you insert some they will be printed.
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VII. MNG support
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VII. MNG support
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The MNG specification (available at http://www.libpng.org/pub/mng) allows
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The MNG specification (available at http://www.libpng.org/pub/mng) allows
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certain extensions to PNG for PNG images that are embedded in MNG datastreams.
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certain extensions to PNG for PNG images that are embedded in MNG datastreams.
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@ -4547,7 +4545,7 @@ or any other MNG chunks; your application must provide its own support for
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them. You may wish to consider using libmng (available at
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them. You may wish to consider using libmng (available at
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https://www.libmng.com/) instead.
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https://www.libmng.com/) instead.
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VIII. Changes to Libpng from version 0.88
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VIII. Changes to Libpng from version 0.88
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It should be noted that versions of libpng later than 0.96 are not
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It should be noted that versions of libpng later than 0.96 are not
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distributed by the original libpng author, Guy Schalnat, nor by
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distributed by the original libpng author, Guy Schalnat, nor by
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@ -4602,7 +4600,7 @@ application:
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png_uint_32 application_vn = PNG_LIBPNG_VER;
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png_uint_32 application_vn = PNG_LIBPNG_VER;
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IX. Changes to Libpng from version 1.0.x to 1.2.x
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IX. Changes to Libpng from version 1.0.x to 1.2.x
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Support for user memory management was enabled by default. To
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Support for user memory management was enabled by default. To
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accomplish this, the functions png_create_read_struct_2(),
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accomplish this, the functions png_create_read_struct_2(),
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@ -4699,7 +4697,7 @@ which also expands tRNS to alpha was replaced with
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png_set_expand_gray_1_2_4_to_8()
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png_set_expand_gray_1_2_4_to_8()
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which does not. It has been deprecated since libpng-1.0.18 and 1.2.9.
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which does not. It has been deprecated since libpng-1.0.18 and 1.2.9.
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X. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x
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X. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x
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Private libpng prototypes and macro definitions were moved from
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Private libpng prototypes and macro definitions were moved from
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png.h and pngconf.h into a new pngpriv.h header file.
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png.h and pngconf.h into a new pngpriv.h header file.
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@ -4809,7 +4807,7 @@ was renamed to PNG_READ_QUANTIZE_SUPPORTED.
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We removed the trailing '.' from the warning and error messages.
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We removed the trailing '.' from the warning and error messages.
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XI. Changes to Libpng from version 1.4.x to 1.5.x
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XI. Changes to Libpng from version 1.4.x to 1.5.x
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From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
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From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
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function) incorrectly returned a value of type png_uint_32.
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function) incorrectly returned a value of type png_uint_32.
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@ -5067,7 +5065,7 @@ even though the default is to use the macros - this allows applications
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to choose at app buildtime whether or not to use macros (previously
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to choose at app buildtime whether or not to use macros (previously
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impossible because the functions weren't in the default build.)
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impossible because the functions weren't in the default build.)
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XII. Changes to Libpng from version 1.5.x to 1.6.x
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XII. Changes to Libpng from version 1.5.x to 1.6.x
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A "simplified API" has been added (see documentation in png.h and a simple
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A "simplified API" has been added (see documentation in png.h and a simple
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example in contrib/examples/pngtopng.c). The new publicly visible API
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example in contrib/examples/pngtopng.c). The new publicly visible API
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@ -5230,7 +5228,7 @@ attempt to decode the Exif profile; it simply returns a byte array
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containing the profile to the calling application which must do its own
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containing the profile to the calling application which must do its own
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decoding.
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decoding.
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XIII. Detecting libpng
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XIII. Detecting libpng
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The png_get_io_ptr() function has been present since libpng-0.88, has never
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The png_get_io_ptr() function has been present since libpng-0.88, has never
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changed, and is unaffected by conditional compilation macros. It is the
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changed, and is unaffected by conditional compilation macros. It is the
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@ -5255,7 +5253,7 @@ or you can browse it with a web browser at
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https://sourceforge.net/p/libpng/code/ci/libpng16/tree/
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https://sourceforge.net/p/libpng/code/ci/libpng16/tree/
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Patches can be sent to png-mng-implement at lists.sourceforge.net or
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Patches can be sent to png-mng-implement at lists.sourceforge.net or
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you can upload them to the libpng bug tracker at
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uploaded to the libpng bug tracker at
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https://libpng.sourceforge.io/
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https://libpng.sourceforge.io/
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@ -5405,58 +5403,3 @@ We do not use the TAB character for indentation in the C sources.
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Lines do not exceed 80 characters.
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Lines do not exceed 80 characters.
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Other rules can be inferred by inspecting the libpng source.
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Other rules can be inferred by inspecting the libpng source.
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XVI. Y2K Compliance in libpng
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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 1.6.35 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 two year fields. One is a 2-byte unsigned integer
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that will hold years up to 65535. The other, which is deprecated,
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holds the date in text format, and will hold years up to 9999.
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The integer is
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"png_uint_16 year" in png_time_struct.
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The string is
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"char time_buffer[29]" in png_struct. This is no longer used
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in libpng-1.6.x and will be removed from libpng-1.7.0.
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There are seven time-related functions:
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png_convert_to_rfc_1123_buffer() in png.c
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(formerly png_convert_to_rfc_1152() in error, and
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also formerly png_convert_to_rfc_1123())
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png_convert_from_struct_tm() in pngwrite.c, called
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in pngwrite.c
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png_convert_from_time_t() in pngwrite.c
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png_get_tIME() in pngget.c
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png_handle_tIME() in pngrutil.c, called in pngread.c
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png_set_tIME() in pngset.c
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png_write_tIME() in pngwutil.c, called in pngwrite.c
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All appear to handle dates properly in a Y2K environment. The
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png_convert_from_time_t() function calls gmtime() to convert from system
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clock time, which returns (year - 1900), which we properly convert to
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|
||||||
the full 4-digit year. There is a possibility that applications using
|
|
||||||
libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
|
|
||||||
function, or that they are incorrectly passing only a 2-digit year
|
|
||||||
instead of "year - 1900" into the png_convert_from_struct_tm() function,
|
|
||||||
but this is not under our control. The libpng documentation has always
|
|
||||||
stated that it works with 4-digit years, and the APIs have been
|
|
||||||
documented as such.
|
|
||||||
|
|
||||||
The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
|
|
||||||
integer to hold the year, and can hold years as large as 65535.
|
|
||||||
|
|
||||||
zlib, upon which libpng depends, is also Y2K compliant. It contains
|
|
||||||
no date-related code.
|
|
||||||
|
|
||||||
|
|
||||||
Glenn Randers-Pehrson
|
|
||||||
libpng maintainer
|
|
||||||
PNG Development Group
|
|
||||||
|
|||||||
281
libpng.3
281
libpng.3
@ -1,11 +1,11 @@
|
|||||||
.TH LIBPNG 3 "July 15, 2018"
|
.TH LIBPNG 3 "2018-Jul-29"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
libpng \- Portable Network Graphics (PNG) Reference Library 1.6.36.git
|
||||||
.SH SYNOPSIS
|
|
||||||
\fB
|
|
||||||
#include <png.h>\fP
|
|
||||||
|
|
||||||
\fBpng_uint_32 png_access_version_number \fI(void\fP\fB);\fP
|
.SH SYNOPSIS
|
||||||
|
\fB#include <png.h>\fP
|
||||||
|
|
||||||
|
\fBpng_uint_32 png_access_version_number (void);\fP
|
||||||
|
|
||||||
\fBvoid png_benign_error (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fIerror\fP\fB);\fP
|
\fBvoid png_benign_error (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fIerror\fP\fB);\fP
|
||||||
|
|
||||||
@ -35,7 +35,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
|||||||
|
|
||||||
\fBpng_structp png_create_write_struct_2 (png_const_charp \fP\fIuser_png_ver\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fP\fIwarn_fn\fP\fB, png_voidp \fP\fImem_ptr\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_free_ptr \fIfree_fn\fP\fB);\fP
|
\fBpng_structp png_create_write_struct_2 (png_const_charp \fP\fIuser_png_ver\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fP\fIwarn_fn\fP\fB, png_voidp \fP\fImem_ptr\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_free_ptr \fIfree_fn\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_data_freer (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fIfreer\fP\fB, png_uint_32 \fImask)\fP\fB);\fP
|
\fBvoid png_data_freer (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fIfreer\fP\fB, png_uint_32 \fImask\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_destroy_info_struct (png_structp \fP\fIpng_ptr\fP\fB, png_infopp \fIinfo_ptr_ptr\fP\fB);\fP
|
\fBvoid png_destroy_info_struct (png_structp \fP\fIpng_ptr\fP\fB, png_infopp \fIinfo_ptr_ptr\fP\fB);\fP
|
||||||
|
|
||||||
@ -233,9 +233,9 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
|||||||
|
|
||||||
\fBint png_image_write_to_file (png_imagep \fP\fIimage\fP\fB, const char \fP\fI*file\fP\fB, int \fP\fIconvert_to_8bit\fP\fB, const void \fP\fI*buffer\fP\fB, png_int_32 \fP\fIrow_stride\fP\fB, void \fI*colormap\fP\fB);\fP
|
\fBint png_image_write_to_file (png_imagep \fP\fIimage\fP\fB, const char \fP\fI*file\fP\fB, int \fP\fIconvert_to_8bit\fP\fB, const void \fP\fI*buffer\fP\fB, png_int_32 \fP\fIrow_stride\fP\fB, void \fI*colormap\fP\fB);\fP
|
||||||
|
|
||||||
\fBint png_image_write_to_memory (png_imagep \fP\fIimage\fP\fB, void \fP\fI*memory\fP\fB, png_alloc_size_t * PNG_RESTRICT \fP\fImemory_bytes\fP\fB, int \fP\fIconvert_to_8_bit\fP\fB, const void \fP\fI*buffer\fP\fB, png_int_32 \fP\fIrow_stride\fP\fB, const void \fI*colormap)\fP\fB);\fP
|
\fBint png_image_write_to_memory (png_imagep \fP\fIimage\fP\fB, void \fP\fI*memory\fP\fB, png_alloc_size_t * PNG_RESTRICT \fP\fImemory_bytes\fP\fB, int \fP\fIconvert_to_8_bit\fP\fB, const void \fP\fI*buffer\fP\fB, png_int_32 \fP\fIrow_stride\fP\fB, const void \fI*colormap\fP\fB);\fP
|
||||||
|
|
||||||
\fBint png_image_write_to_stdio (png_imagep \fP\fIimage\fP\fB, FILE \fP\fI*file\fP\fB, int \fP\fIconvert_to_8_bit\fP\fB, const void \fP\fI*buffer\fP\fB, png_int_32 \fP\fIrow_stride\fP\fB, void \fI*colormap)\fP\fB);\fP
|
\fBint png_image_write_to_stdio (png_imagep \fP\fIimage\fP\fB, FILE \fP\fI*file\fP\fB, int \fP\fIconvert_to_8_bit\fP\fB, const void \fP\fI*buffer\fP\fB, png_int_32 \fP\fIrow_stride\fP\fB, void \fI*colormap\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_info_init_3 (png_infopp \fP\fIinfo_ptr\fP\fB, size_t \fIpng_info_struct_size\fP\fB);\fP
|
\fBvoid png_info_init_3 (png_infopp \fP\fIinfo_ptr\fP\fB, size_t \fIpng_info_struct_size\fP\fB);\fP
|
||||||
|
|
||||||
@ -253,9 +253,9 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
|||||||
|
|
||||||
\fBvoid png_process_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, size_t \fIbuffer_size\fP\fB);\fP
|
\fBvoid png_process_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, size_t \fIbuffer_size\fP\fB);\fP
|
||||||
|
|
||||||
\fBsize_t png_process_data_pause \fP\fI(png_structp\fP\fB, int \fIsave\fP\fB);\fP
|
\fBsize_t png_process_data_pause (png_structp \fP\fIpng_ptr\fP\fB, int \fIsave\fP\fB);\fP
|
||||||
|
|
||||||
\fBpng_uint_32 png_process_data_skip \fI(png_structp\fP\fB);\fP
|
\fBpng_uint_32 png_process_data_skip (png_structp \fP\fIpng_ptr\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_progressive_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIold_row\fP\fB, png_bytep \fInew_row\fP\fB);\fP
|
\fBvoid png_progressive_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIold_row\fP\fB, png_bytep \fInew_row\fP\fB);\fP
|
||||||
|
|
||||||
@ -297,7 +297,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
|||||||
|
|
||||||
\fBvoid png_set_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_color_16p \fIbackground\fP\fB);\fP
|
\fBvoid png_set_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_color_16p \fIbackground\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_set_check_for_invalid_index(png_structrp \fP\fIpng_ptr\fP\fB, int \fIallowed\fP\fB);\fP
|
\fBvoid png_set_check_for_invalid_index (png_structrp \fP\fIpng_ptr\fP\fB, int \fIallowed\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_set_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
|
\fBvoid png_set_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
|
||||||
|
|
||||||
@ -453,7 +453,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
|||||||
|
|
||||||
\fBvoid png_set_text_compression_window_bits (png_structp \fP\fIpng_ptr\fP\fB, int \fIwindow_bits\fP\fB);\fP
|
\fBvoid png_set_text_compression_window_bits (png_structp \fP\fIpng_ptr\fP\fB, int \fIwindow_bits\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid \fP\fIpng_set_text_compression_method\fP\fB, (png_structp \fP\fIpng_ptr\fP\fB, int \fImethod)\fP\fB);\fP
|
\fBvoid png_set_text_compression_method (png_structp \fP\fIpng_ptr\fP\fB, int \fImethod\fP\fB);\fP
|
||||||
|
|
||||||
\fBvoid png_set_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
|
\fBvoid png_set_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
|
||||||
|
|
||||||
@ -515,11 +515,11 @@ the Portable Network Graphics (PNG) format image files. It uses the
|
|||||||
.IR zlib(3)
|
.IR zlib(3)
|
||||||
compression library.
|
compression library.
|
||||||
Following is a copy of the libpng-manual.txt file that accompanies libpng.
|
Following is a copy of the libpng-manual.txt file that accompanies libpng.
|
||||||
|
|
||||||
.SH LIBPNG.TXT
|
.SH LIBPNG.TXT
|
||||||
libpng-manual.txt - A description on how to use and modify libpng
|
libpng-manual.txt - A description on how to use and modify libpng
|
||||||
|
|
||||||
libpng version 1.6.35 - July 15, 2018
|
Copyright (c) 2018 Cosmin Truta
|
||||||
Updated and distributed by Glenn Randers-Pehrson
|
|
||||||
Copyright (c) 1998-2018 Glenn Randers-Pehrson
|
Copyright (c) 1998-2018 Glenn Randers-Pehrson
|
||||||
|
|
||||||
This document is released under the libpng license.
|
This document is released under the libpng license.
|
||||||
@ -530,7 +530,7 @@ libpng-manual.txt - A description on how to use and modify libpng
|
|||||||
|
|
||||||
libpng versions 0.97, January 1998, through 1.6.35 - July 15, 2018
|
libpng versions 0.97, January 1998, through 1.6.35 - July 15, 2018
|
||||||
Updated and distributed by Glenn Randers-Pehrson
|
Updated and distributed by Glenn Randers-Pehrson
|
||||||
Copyright (c) 1998-2017 Glenn Randers-Pehrson
|
Copyright (c) 1998-2018 Glenn Randers-Pehrson
|
||||||
|
|
||||||
libpng 1.0 beta 6 - version 0.96 - May 28, 1997
|
libpng 1.0 beta 6 - version 0.96 - May 28, 1997
|
||||||
Updated and distributed by Andreas Dilger
|
Updated and distributed by Andreas Dilger
|
||||||
@ -562,7 +562,6 @@ libpng-manual.txt - A description on how to use and modify libpng
|
|||||||
XIII. Detecting libpng
|
XIII. Detecting libpng
|
||||||
XIV. Source code repository
|
XIV. Source code repository
|
||||||
XV. Coding style
|
XV. Coding style
|
||||||
XVI. Y2K Compliance in libpng
|
|
||||||
|
|
||||||
.SH I. Introduction
|
.SH I. Introduction
|
||||||
|
|
||||||
@ -5038,7 +5037,7 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
|
|||||||
having level = 0 will be printed. There aren't any such statements in
|
having level = 0 will be printed. There aren't any such statements in
|
||||||
this version of libpng, but if you insert some they will be printed.
|
this version of libpng, but if you insert some they will be printed.
|
||||||
|
|
||||||
.SH VII. MNG support
|
.SH VII. MNG support
|
||||||
|
|
||||||
The MNG specification (available at http://www.libpng.org/pub/mng) allows
|
The MNG specification (available at http://www.libpng.org/pub/mng) allows
|
||||||
certain extensions to PNG for PNG images that are embedded in MNG datastreams.
|
certain extensions to PNG for PNG images that are embedded in MNG datastreams.
|
||||||
@ -5065,7 +5064,7 @@ or any other MNG chunks; your application must provide its own support for
|
|||||||
them. You may wish to consider using libmng (available at
|
them. You may wish to consider using libmng (available at
|
||||||
https://www.libmng.com/) instead.
|
https://www.libmng.com/) instead.
|
||||||
|
|
||||||
.SH VIII. Changes to Libpng from version 0.88
|
.SH VIII. Changes to Libpng from version 0.88
|
||||||
|
|
||||||
It should be noted that versions of libpng later than 0.96 are not
|
It should be noted that versions of libpng later than 0.96 are not
|
||||||
distributed by the original libpng author, Guy Schalnat, nor by
|
distributed by the original libpng author, Guy Schalnat, nor by
|
||||||
@ -5120,7 +5119,7 @@ application:
|
|||||||
|
|
||||||
png_uint_32 application_vn = PNG_LIBPNG_VER;
|
png_uint_32 application_vn = PNG_LIBPNG_VER;
|
||||||
|
|
||||||
.SH IX. Changes to Libpng from version 1.0.x to 1.2.x
|
.SH IX. Changes to Libpng from version 1.0.x to 1.2.x
|
||||||
|
|
||||||
Support for user memory management was enabled by default. To
|
Support for user memory management was enabled by default. To
|
||||||
accomplish this, the functions png_create_read_struct_2(),
|
accomplish this, the functions png_create_read_struct_2(),
|
||||||
@ -5217,7 +5216,7 @@ which also expands tRNS to alpha was replaced with
|
|||||||
png_set_expand_gray_1_2_4_to_8()
|
png_set_expand_gray_1_2_4_to_8()
|
||||||
which does not. It has been deprecated since libpng-1.0.18 and 1.2.9.
|
which does not. It has been deprecated since libpng-1.0.18 and 1.2.9.
|
||||||
|
|
||||||
.SH X. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x
|
.SH X. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x
|
||||||
|
|
||||||
Private libpng prototypes and macro definitions were moved from
|
Private libpng prototypes and macro definitions were moved from
|
||||||
png.h and pngconf.h into a new pngpriv.h header file.
|
png.h and pngconf.h into a new pngpriv.h header file.
|
||||||
@ -5327,7 +5326,7 @@ was renamed to PNG_READ_QUANTIZE_SUPPORTED.
|
|||||||
|
|
||||||
We removed the trailing '.' from the warning and error messages.
|
We removed the trailing '.' from the warning and error messages.
|
||||||
|
|
||||||
.SH XI. Changes to Libpng from version 1.4.x to 1.5.x
|
.SH XI. Changes to Libpng from version 1.4.x to 1.5.x
|
||||||
|
|
||||||
From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
|
From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
|
||||||
function) incorrectly returned a value of type png_uint_32.
|
function) incorrectly returned a value of type png_uint_32.
|
||||||
@ -5585,7 +5584,7 @@ even though the default is to use the macros - this allows applications
|
|||||||
to choose at app buildtime whether or not to use macros (previously
|
to choose at app buildtime whether or not to use macros (previously
|
||||||
impossible because the functions weren't in the default build.)
|
impossible because the functions weren't in the default build.)
|
||||||
|
|
||||||
.SH XII. Changes to Libpng from version 1.5.x to 1.6.x
|
.SH XII. Changes to Libpng from version 1.5.x to 1.6.x
|
||||||
|
|
||||||
A "simplified API" has been added (see documentation in png.h and a simple
|
A "simplified API" has been added (see documentation in png.h and a simple
|
||||||
example in contrib/examples/pngtopng.c). The new publicly visible API
|
example in contrib/examples/pngtopng.c). The new publicly visible API
|
||||||
@ -5748,7 +5747,7 @@ attempt to decode the Exif profile; it simply returns a byte array
|
|||||||
containing the profile to the calling application which must do its own
|
containing the profile to the calling application which must do its own
|
||||||
decoding.
|
decoding.
|
||||||
|
|
||||||
.SH XIII. Detecting libpng
|
.SH XIII. Detecting libpng
|
||||||
|
|
||||||
The png_get_io_ptr() function has been present since libpng-0.88, has never
|
The png_get_io_ptr() function has been present since libpng-0.88, has never
|
||||||
changed, and is unaffected by conditional compilation macros. It is the
|
changed, and is unaffected by conditional compilation macros. It is the
|
||||||
@ -5924,61 +5923,6 @@ Lines do not exceed 80 characters.
|
|||||||
|
|
||||||
Other rules can be inferred by inspecting the libpng source.
|
Other rules can be inferred by inspecting the libpng source.
|
||||||
|
|
||||||
.SH XVI. Y2K Compliance in libpng
|
|
||||||
|
|
||||||
Since the PNG Development group is an ad-hoc body, we can't make
|
|
||||||
an official declaration.
|
|
||||||
|
|
||||||
This is your unofficial assurance that libpng from version 0.71 and
|
|
||||||
upward through 1.6.35 are Y2K compliant. It is my belief that earlier
|
|
||||||
versions were also Y2K compliant.
|
|
||||||
|
|
||||||
Libpng only has two year fields. One is a 2-byte unsigned integer
|
|
||||||
that will hold years up to 65535. The other, which is deprecated,
|
|
||||||
holds the date in text format, and will hold years up to 9999.
|
|
||||||
|
|
||||||
The integer is
|
|
||||||
"png_uint_16 year" in png_time_struct.
|
|
||||||
|
|
||||||
The string is
|
|
||||||
"char time_buffer[29]" in png_struct. This is no longer used
|
|
||||||
in libpng-1.6.x and will be removed from libpng-1.7.0.
|
|
||||||
|
|
||||||
There are seven time-related functions:
|
|
||||||
|
|
||||||
png_convert_to_rfc_1123_buffer() in png.c
|
|
||||||
(formerly png_convert_to_rfc_1152() in error, and
|
|
||||||
also formerly png_convert_to_rfc_1123())
|
|
||||||
png_convert_from_struct_tm() in pngwrite.c, called
|
|
||||||
in pngwrite.c
|
|
||||||
png_convert_from_time_t() in pngwrite.c
|
|
||||||
png_get_tIME() in pngget.c
|
|
||||||
png_handle_tIME() in pngrutil.c, called in pngread.c
|
|
||||||
png_set_tIME() in pngset.c
|
|
||||||
png_write_tIME() in pngwutil.c, called in pngwrite.c
|
|
||||||
|
|
||||||
All appear to handle dates properly in a Y2K environment. The
|
|
||||||
png_convert_from_time_t() function calls gmtime() to convert from system
|
|
||||||
clock time, which returns (year - 1900), which we properly convert to
|
|
||||||
the full 4-digit year. There is a possibility that applications using
|
|
||||||
libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
|
|
||||||
function, or that they are incorrectly passing only a 2-digit year
|
|
||||||
instead of "year - 1900" into the png_convert_from_struct_tm() function,
|
|
||||||
but this is not under our control. The libpng documentation has always
|
|
||||||
stated that it works with 4-digit years, and the APIs have been
|
|
||||||
documented as such.
|
|
||||||
|
|
||||||
The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
|
|
||||||
integer to hold the year, and can hold years as large as 65535.
|
|
||||||
|
|
||||||
zlib, upon which libpng depends, is also Y2K compliant. It contains
|
|
||||||
no date-related code.
|
|
||||||
|
|
||||||
|
|
||||||
Glenn Randers-Pehrson
|
|
||||||
libpng maintainer
|
|
||||||
PNG Development Group
|
|
||||||
|
|
||||||
.SH NOTE
|
.SH NOTE
|
||||||
|
|
||||||
Note about libpng version numbers:
|
Note about libpng version numbers:
|
||||||
@ -5989,9 +5933,9 @@ 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 png.h shared-lib
|
source png.h png.h shared-lib
|
||||||
version string int version
|
version string int version
|
||||||
------- ------ ----- ----------
|
------- ------ ----- ----------
|
||||||
0.89c "1.0 beta 3" 0.89 89 1.0.89
|
0.89c "1.0 beta 3" 0.89 89 1.0.89
|
||||||
0.90 "1.0 beta 4" 0.90 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 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]
|
||||||
@ -6026,23 +5970,25 @@ the first widely used release:
|
|||||||
1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
|
1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
|
||||||
1.0.7 1 10007 (still compatible)
|
1.0.7 1 10007 (still compatible)
|
||||||
...
|
...
|
||||||
1.0.19 10 10019 10.so.0.19[.0]
|
1.0.69 10 10069 10.so.0.69[.0]
|
||||||
...
|
...
|
||||||
1.2.59 13 10259 12.so.0.59[.0]
|
1.2.59 13 10259 12.so.0.59[.0]
|
||||||
...
|
...
|
||||||
|
1.4.20 14 10420 14.so.0.20[.0]
|
||||||
|
...
|
||||||
1.5.30 15 10530 15.so.15.30[.0]
|
1.5.30 15 10530 15.so.15.30[.0]
|
||||||
...
|
...
|
||||||
1.6.35 16 10635 16.so.16.35[.0]
|
1.6.35 16 10635 16.so.16.35[.0]
|
||||||
|
|
||||||
Henceforth the source version will match the shared-library minor
|
Henceforth the source version will match the shared-library minor and
|
||||||
and patch numbers; the shared-library major version number will be
|
patch numbers; the shared-library major version number will be used for
|
||||||
used for changes in backward compatibility, as it is intended. The
|
changes in backward compatibility, as it is intended.
|
||||||
PNG_PNGLIB_VER macro, which is not used within libpng but is available
|
The PNG_PNGLIB_VER macro, which is not used within libpng but is
|
||||||
for applications, is an unsigned integer of the form xyyzz corresponding
|
available for applications, is an unsigned integer of the form XYYZZ
|
||||||
to the source version x.y.z (leading zeros in y and z). Beta versions
|
corresponding to the source version X.Y.Z (leading zeros in Y and Z).
|
||||||
were given the previous public release number plus a letter, until
|
Beta versions were given the previous public release number plus a
|
||||||
version 1.0.6j; from then on they were given the upcoming public
|
letter, until version 1.0.6j; from then on they were given the upcoming
|
||||||
release number plus "betaNN" or "rcNN".
|
public release number plus "betaNN" or "rcNN".
|
||||||
|
|
||||||
.SH "SEE ALSO"
|
.SH "SEE ALSO"
|
||||||
.IR libpngpf(3) ", " png(5)
|
.IR libpngpf(3) ", " png(5)
|
||||||
@ -6079,8 +6025,9 @@ In the case of any inconsistency between the PNG specification
|
|||||||
and this library, the specification takes precedence.
|
and this library, the specification takes precedence.
|
||||||
|
|
||||||
.SH AUTHORS
|
.SH AUTHORS
|
||||||
This man page: Glenn Randers-Pehrson
|
This man page:
|
||||||
<glennrp at users.sourceforge.net>
|
Initially created by Glenn Randers-Pehrson.
|
||||||
|
Maintained by Cosmin Truta.
|
||||||
|
|
||||||
The contributing authors would like to thank all those who helped
|
The contributing authors would like to thank all those who helped
|
||||||
with testing, bug fixes, and patience. This wouldn't have been
|
with testing, bug fixes, and patience. This wouldn't have been
|
||||||
@ -6088,9 +6035,9 @@ 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 1.6.35 - July 15, 2018:
|
Libpng:
|
||||||
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.
|
||||||
Maintained by Glenn Randers-Pehrson.
|
Maintained by Cosmin Truta.
|
||||||
|
|
||||||
Supported by the PNG development group
|
Supported by the PNG development group
|
||||||
.br
|
.br
|
||||||
@ -6100,146 +6047,4 @@ png-mng-implement at lists.sourceforge.net (subscription required; visit
|
|||||||
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
|
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
|
||||||
to subscribe).
|
to subscribe).
|
||||||
|
|
||||||
.SH NOTICES:
|
|
||||||
|
|
||||||
This copy of the libpng notices is provided for your convenience. In case of
|
|
||||||
any discrepancy between this copy and the notices in the file png.h that is
|
|
||||||
included in the libpng distribution, the latter shall prevail.
|
|
||||||
|
|
||||||
COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
|
|
||||||
|
|
||||||
If you modify libpng you may insert additional notices immediately following
|
|
||||||
this sentence.
|
|
||||||
|
|
||||||
This code is released under the libpng license.
|
|
||||||
|
|
||||||
libpng versions 1.0.7, July 1, 2000 through 1.6.35, July 15, 2018 are
|
|
||||||
Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
|
|
||||||
derived from libpng-1.0.6, and are distributed according to the same
|
|
||||||
disclaimer and license as libpng-1.0.6 with the following individuals
|
|
||||||
added to the list of Contributing Authors:
|
|
||||||
|
|
||||||
Simon-Pierre Cadieux
|
|
||||||
Eric S. Raymond
|
|
||||||
Mans Rullgard
|
|
||||||
Cosmin Truta
|
|
||||||
Gilles Vollant
|
|
||||||
James Yu
|
|
||||||
Mandar Sahastrabuddhe
|
|
||||||
Google Inc.
|
|
||||||
Vadim Barkov
|
|
||||||
|
|
||||||
and with the following additions to the disclaimer:
|
|
||||||
|
|
||||||
There is no warranty against interference with your enjoyment of the
|
|
||||||
library or against infringement. There is no warranty that our
|
|
||||||
efforts or the library will fulfill any of your particular purposes
|
|
||||||
or needs. This library is provided with all faults, and the entire
|
|
||||||
risk of satisfactory quality, performance, accuracy, and effort is with
|
|
||||||
the user.
|
|
||||||
|
|
||||||
Some files in the "contrib" directory and some configure-generated
|
|
||||||
files that are distributed with libpng have other copyright owners and
|
|
||||||
are released under other open source licenses.
|
|
||||||
|
|
||||||
libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
|
|
||||||
Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
|
|
||||||
libpng-0.96, and are distributed according to the same disclaimer and
|
|
||||||
license as libpng-0.96, with the following individuals added to the list
|
|
||||||
of Contributing Authors:
|
|
||||||
|
|
||||||
Tom Lane
|
|
||||||
Glenn Randers-Pehrson
|
|
||||||
Willem van Schaik
|
|
||||||
|
|
||||||
libpng versions 0.89, June 1996, through 0.96, May 1997, are
|
|
||||||
Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
|
|
||||||
and are distributed according to the same disclaimer and license as
|
|
||||||
libpng-0.88, with the following individuals added to the list of
|
|
||||||
Contributing Authors:
|
|
||||||
|
|
||||||
John Bowler
|
|
||||||
Kevin Bracey
|
|
||||||
Sam Bushell
|
|
||||||
Magnus Holmgren
|
|
||||||
Greg Roelofs
|
|
||||||
Tom Tanner
|
|
||||||
|
|
||||||
Some files in the "scripts" directory have other copyright owners
|
|
||||||
but are released under this license.
|
|
||||||
|
|
||||||
libpng versions 0.5, May 1995, through 0.88, January 1996, are
|
|
||||||
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
|
|
||||||
|
|
||||||
For the purposes of this copyright and license, "Contributing Authors"
|
|
||||||
is defined as the following set of individuals:
|
|
||||||
|
|
||||||
Andreas Dilger
|
|
||||||
Dave Martindale
|
|
||||||
Guy Eric Schalnat
|
|
||||||
Paul Schmidt
|
|
||||||
Tim Wegner
|
|
||||||
|
|
||||||
The PNG Reference Library is supplied "AS IS". The Contributing Authors
|
|
||||||
and Group 42, Inc. disclaim all warranties, expressed or implied,
|
|
||||||
including, without limitation, the warranties of merchantability and of
|
|
||||||
fitness for any purpose. The Contributing Authors and Group 42, Inc.
|
|
||||||
assume no liability for direct, indirect, incidental, special, exemplary,
|
|
||||||
or consequential damages, which may result from the use of the PNG
|
|
||||||
Reference Library, even if advised of the possibility of such damage.
|
|
||||||
|
|
||||||
Permission is hereby granted to use, copy, modify, and distribute this
|
|
||||||
source code, or portions hereof, for any purpose, without fee, subject
|
|
||||||
to the following restrictions:
|
|
||||||
|
|
||||||
1. The origin of this source code must not be misrepresented.
|
|
||||||
|
|
||||||
2. Altered versions must be plainly marked as such and must not
|
|
||||||
be misrepresented as being the original source.
|
|
||||||
|
|
||||||
3. This Copyright notice may not be removed or altered from any
|
|
||||||
source or altered source distribution.
|
|
||||||
|
|
||||||
The Contributing Authors and Group 42, Inc. specifically permit, without
|
|
||||||
fee, and encourage the use of this source code as a component to
|
|
||||||
supporting the PNG file format in commercial products. If you use this
|
|
||||||
source code in a product, acknowledgment is not required but would be
|
|
||||||
appreciated.
|
|
||||||
|
|
||||||
END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
|
|
||||||
|
|
||||||
TRADEMARK:
|
|
||||||
|
|
||||||
The name "libpng" has not been registered by the Copyright owner
|
|
||||||
as a trademark in any jurisdiction. However, because libpng has
|
|
||||||
been distributed and maintained world-wide, continually since 1995,
|
|
||||||
the Copyright owner claims "common-law trademark protection" in any
|
|
||||||
jurisdiction where common-law trademark is recognized.
|
|
||||||
|
|
||||||
OSI CERTIFICATION:
|
|
||||||
|
|
||||||
Libpng is OSI Certified Open Source Software. OSI Certified Open Source is
|
|
||||||
a certification mark of the Open Source Initiative. OSI has not addressed
|
|
||||||
the additional disclaimers inserted at version 1.0.7.
|
|
||||||
|
|
||||||
EXPORT CONTROL:
|
|
||||||
|
|
||||||
The Copyright owner believes that the Export Control Classification
|
|
||||||
Number (ECCN) for libpng is EAR99, which means not subject to export
|
|
||||||
controls or International Traffic in Arms Regulations (ITAR) because
|
|
||||||
it is open source, publicly available software, that does not contain
|
|
||||||
any encryption software. See the EAR, paragraphs 734.3(b)(3) and
|
|
||||||
734.7(b).
|
|
||||||
|
|
||||||
A "png_get_copyright" function is available, for convenient use in "about"
|
|
||||||
boxes and the like:
|
|
||||||
|
|
||||||
printf("%s", png_get_copyright(NULL));
|
|
||||||
|
|
||||||
Also, the PNG logo (in PNG format, of course) is supplied in the
|
|
||||||
files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
|
|
||||||
|
|
||||||
Glenn Randers-Pehrson
|
|
||||||
July 15, 2018
|
|
||||||
|
|
||||||
.\" end of man page
|
.\" end of man page
|
||||||
|
|||||||
12
libpngpf.3
12
libpngpf.3
@ -1,7 +1,8 @@
|
|||||||
.TH LIBPNGPF 3 "July 15, 2018"
|
.TH LIBPNGPF 3 "2018-Jul-29"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
libpng \- Portable Network Graphics (PNG) Reference Library 1.6.35
|
libpng \- Portable Network Graphics (PNG) Reference Library 1.6.36.git
|
||||||
(private functions)
|
(private functions)
|
||||||
|
|
||||||
.SH SYNOPSIS
|
.SH SYNOPSIS
|
||||||
\fB#include \fI"pngpriv.h"
|
\fB#include \fI"pngpriv.h"
|
||||||
|
|
||||||
@ -16,7 +17,8 @@ The functions previously listed here are used privately by libpng and are not
|
|||||||
available for use by applications. They are not "exported" to applications
|
available for use by applications. They are not "exported" to applications
|
||||||
using shared libraries.
|
using shared libraries.
|
||||||
|
|
||||||
.SH SEE ALSO
|
.SH "SEE ALSO"
|
||||||
.BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
|
.BR "png"(5), " libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
|
||||||
.SH AUTHOR
|
|
||||||
Glenn Randers-Pehrson
|
.SH AUTHORS
|
||||||
|
Cosmin Truta, Glenn Randers-Pehrson
|
||||||
|
|||||||
66
png.5
66
png.5
@ -1,47 +1,49 @@
|
|||||||
.TH PNG 5 "April 1, 2017"
|
.TH PNG 5 "2018-Jul-29"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
png \- Portable Network Graphics (PNG) format
|
png \- Portable Network Graphics (PNG) format
|
||||||
|
|
||||||
.SH DESCRIPTION
|
.SH DESCRIPTION
|
||||||
PNG (Portable Network Graphics) is an extensible file format for the
|
PNG (Portable Network Graphics) is an extensible file format for the
|
||||||
lossless, portable, well-compressed storage of raster images. PNG provides
|
lossless, portable, well-compressed storage of raster images. PNG
|
||||||
a patent-free replacement for GIF and can also replace many
|
provides a patent-free replacement for GIF, and can also replace many
|
||||||
common uses of TIFF. Indexed-color, grayscale, and truecolor images are
|
common uses of TIFF. Indexed-color, grayscale, and truecolor images are
|
||||||
supported, plus an optional alpha channel. Sample depths range from
|
supported, plus an optional alpha channel. Sample depths range from
|
||||||
1 to 16 bits.
|
1 to 16 bits.
|
||||||
.br
|
.br
|
||||||
|
PNG is designed to work well in online viewing applications, such
|
||||||
PNG is designed to work well in online viewing applications, such as the
|
as the World Wide Web, so it is fully streamable with a progressive
|
||||||
World Wide Web, so it is fully streamable with a progressive display
|
display option. PNG is robust, providing both full file integrity
|
||||||
option. PNG is robust, providing both full file integrity checking and
|
checking and fast, simple detection of common transmission errors.
|
||||||
fast, simple detection of common transmission errors. Also, PNG can store
|
Also, PNG can store gamma and chromaticity data for improved color
|
||||||
gamma and chromaticity data for improved color matching on heterogeneous
|
matching on heterogeneous platforms.
|
||||||
platforms.
|
|
||||||
|
|
||||||
.SH "SEE ALSO"
|
.SH "SEE ALSO"
|
||||||
.BR "libpng"(3), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
|
.BR "libpng"(3), " libpngpf"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
|
||||||
.LP
|
.LP
|
||||||
PNG specification (second edition), November 2003:
|
PNG Specification (Second Edition), November 2003:
|
||||||
.IP
|
.IP
|
||||||
.br
|
.br
|
||||||
<https://www.w3.org/TR/2003/REC-PNG-20031110/
|
https://www.w3.org/TR/2003/REC-PNG-20031110/
|
||||||
PNG 1.2 specification, July 1999:
|
.LP
|
||||||
|
PNG 1.2 Specification, July 1999:
|
||||||
.IP
|
.IP
|
||||||
.br
|
.br
|
||||||
https://png-mng.sourceforge.io/pub/png/spec/1.2/
|
https://png-mng.sourceforge.io/pub/png/spec/1.2/
|
||||||
.LP
|
.LP
|
||||||
PNG 1.0 specification, October 1996:
|
PNG 1.0 Specification, October 1996:
|
||||||
.IP
|
.IP
|
||||||
.br
|
.br
|
||||||
RFC 2083
|
RFC 2083
|
||||||
.IP
|
|
||||||
.br
|
.br
|
||||||
https://www.ietf.org/rfc/rfc2083.txt
|
https://www.ietf.org/rfc/rfc2083.txt
|
||||||
|
.IP
|
||||||
.br
|
.br
|
||||||
or (as a W3C Recommendation) at
|
or W3C Recommendation
|
||||||
.br
|
.br
|
||||||
https://www.w3.org/TR/REC-png-961001
|
https://www.w3.org/TR/REC-png-961001
|
||||||
|
|
||||||
.SH AUTHORS
|
.SH AUTHORS
|
||||||
This man page: Glenn Randers-Pehrson
|
This man page: Cosmin Truta, Glenn Randers-Pehrson
|
||||||
.LP
|
.LP
|
||||||
Portable Network Graphics (PNG) Specification (Second Edition)
|
Portable Network Graphics (PNG) Specification (Second Edition)
|
||||||
Information technology - Computer graphics and image processing -
|
Information technology - Computer graphics and image processing -
|
||||||
@ -53,22 +55,30 @@ Glenn Randers-Pehrson and others (png-list).
|
|||||||
.LP
|
.LP
|
||||||
Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
|
Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
|
||||||
Thomas Boutell and others (png-list).
|
Thomas Boutell and others (png-list).
|
||||||
.LP
|
|
||||||
|
|
||||||
|
.SH COPYRIGHT
|
||||||
.SH COPYRIGHT NOTICE
|
|
||||||
.LP
|
.LP
|
||||||
This man page is Copyright (c) 1998-2006 Glenn Randers-Pehrson. See png.h
|
This man page is
|
||||||
for conditions of use and distribution.
|
.br
|
||||||
|
Copyright (c) 2018 Cosmin Truta.
|
||||||
|
.br
|
||||||
|
Copyright (c) 1998-2006 Glenn Randers-Pehrson.
|
||||||
|
.br
|
||||||
|
See png.h for conditions of use and distribution.
|
||||||
.LP
|
.LP
|
||||||
The PNG Specification (Second Edition) is
|
The PNG Specification (Second Edition) is
|
||||||
|
.br
|
||||||
Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.
|
Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved.
|
||||||
.LP
|
.LP
|
||||||
The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.
|
The PNG-1.2 Specification is
|
||||||
|
.br
|
||||||
|
Copyright (c) 1999 Glenn Randers-Pehrson.
|
||||||
|
.br
|
||||||
See the specification for conditions of use and distribution.
|
See the specification for conditions of use and distribution.
|
||||||
.LP
|
.LP
|
||||||
The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of
|
The PNG-1.0 Specification is
|
||||||
Technology. See the specification for conditions of use and distribution.
|
.br
|
||||||
.LP
|
Copyright (c) 1996 Massachusetts Institute of Technology.
|
||||||
|
.br
|
||||||
|
See the specification for conditions of use and distribution.
|
||||||
.\" end of man page
|
.\" end of man page
|
||||||
|
|
||||||
|
|||||||
33
png.h
33
png.h
@ -221,15 +221,15 @@
|
|||||||
* ...
|
* ...
|
||||||
* 1.6.35 16 10635 16.so.16.35[.0]
|
* 1.6.35 16 10635 16.so.16.35[.0]
|
||||||
*
|
*
|
||||||
* Henceforth the source version will match the shared-library major
|
* Henceforth the source version will match the shared-library major and
|
||||||
* and minor numbers; the shared-library major version number will be
|
* minor numbers; the shared-library major version number will be used for
|
||||||
* used for changes in backward compatibility, as it is intended. The
|
* changes in backward compatibility, as it is intended.
|
||||||
* PNG_LIBPNG_VER macro, which is not used within libpng but is available
|
* The PNG_LIBPNG_VER macro, which is not used within libpng but is
|
||||||
* for applications, is an unsigned integer of the form xyyzz corresponding
|
* available for applications, is an unsigned integer of the form XYYZZ
|
||||||
* to the source version x.y.z (leading zeros in y and z). Beta versions
|
* corresponding to the source version X.Y.Z (leading zeros in Y and Z).
|
||||||
* were given the previous public release number plus a letter, until
|
* Beta versions were given the previous public release number plus a
|
||||||
* version 1.0.6j; from then on they were given the upcoming public
|
* letter, until version 1.0.6j; from then on they were given the upcoming
|
||||||
* release number plus "betaNN" or "rcNN".
|
* public release number plus "betaNN" or "rcNN".
|
||||||
*
|
*
|
||||||
* Binary incompatibility exists only when applications make direct access
|
* Binary incompatibility exists only when applications make direct access
|
||||||
* to the info_ptr or png_ptr members through png.h, and the compiled
|
* to the info_ptr or png_ptr members through png.h, and the compiled
|
||||||
@ -240,7 +240,7 @@
|
|||||||
*
|
*
|
||||||
* See libpng.txt or libpng.3 for more information. The PNG specification
|
* See libpng.txt or libpng.3 for more information. The PNG specification
|
||||||
* is available as a W3C Recommendation and as an ISO Specification,
|
* is available as a W3C Recommendation and as an ISO Specification,
|
||||||
* <https://www.w3.org/TR/2003/REC-PNG-20031110/
|
* <https://www.w3.org/TR/2003/REC-PNG-20031110/>
|
||||||
*/
|
*/
|
||||||
|
|
||||||
#ifndef PNG_H
|
#ifndef PNG_H
|
||||||
@ -292,11 +292,12 @@
|
|||||||
|
|
||||||
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
|
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
|
||||||
|
|
||||||
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
|
/* Careful here. At one time, Guy wanted to use 082, but that
|
||||||
* We must not include leading zeros.
|
* would be octal. We must not include leading zeros.
|
||||||
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
|
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here
|
||||||
* version 1.0.0 was mis-numbered 100 instead of 10000). From
|
* (only version 1.0.0 was mis-numbered 100 instead of 10000).
|
||||||
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
|
* From version 1.0.1 it is:
|
||||||
|
* XXYYZZ, where XX=major, YY=minor, ZZ=release
|
||||||
*/
|
*/
|
||||||
#define PNG_LIBPNG_VER 10636 /* 1.6.36 */
|
#define PNG_LIBPNG_VER 10636 /* 1.6.36 */
|
||||||
|
|
||||||
@ -2713,7 +2714,7 @@ typedef struct
|
|||||||
*
|
*
|
||||||
* When the simplified API needs to convert between sRGB and linear colorspaces,
|
* When the simplified API needs to convert between sRGB and linear colorspaces,
|
||||||
* the actual sRGB transfer curve defined in the sRGB specification (see the
|
* the actual sRGB transfer curve defined in the sRGB specification (see the
|
||||||
* article at https://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
|
* article at <https://en.wikipedia.org/wiki/SRGB>) is used, not the gamma=1/2.2
|
||||||
* approximation used elsewhere in libpng.
|
* approximation used elsewhere in libpng.
|
||||||
*
|
*
|
||||||
* When an alpha channel is present it is expected to denote pixel coverage
|
* When an alpha channel is present it is expected to denote pixel coverage
|
||||||
|
|||||||
@ -1,11 +1,11 @@
|
|||||||
|
|
||||||
Makefiles for libpng
|
Makefiles for libpng
|
||||||
|
|
||||||
pnglibconf.h.prebuilt => Stores configuration settings
|
pnglibconf.h.prebuilt => Configuration settings
|
||||||
makefile.linux => Linux/ELF makefile
|
makefile.linux => Linux/ELF makefile
|
||||||
(gcc, creates libpng16.so.16.1.6.*)
|
(gcc, creates shared libpng16.so.16.1.6.*)
|
||||||
makefile.linux-opt=> Linux/ELF makefile with hardware optimizations on
|
makefile.linux-opt=> Linux/ELF makefile with hardware optimizations on
|
||||||
(gcc, creates libpng16.so.16.1.6.*)
|
(gcc, creates shared libpng16.so.16.1.6.*)
|
||||||
makefile.gcc => Generic makefile (gcc, creates static libpng.a)
|
makefile.gcc => Generic makefile (gcc, creates static libpng.a)
|
||||||
makefile.knr => Archaic UNIX Makefile that converts files with
|
makefile.knr => Archaic UNIX Makefile that converts files with
|
||||||
ansi2knr (Requires ansi2knr.c from
|
ansi2knr (Requires ansi2knr.c from
|
||||||
@ -15,10 +15,10 @@ pnglibconf.h.prebuilt => Stores configuration settings
|
|||||||
makefile.amiga => Amiga makefile
|
makefile.amiga => Amiga makefile
|
||||||
makefile.atari => Atari makefile
|
makefile.atari => Atari makefile
|
||||||
makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
|
makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
|
||||||
makefile.beos => beos makefile
|
makefile.beos => BeOS makefile
|
||||||
makefile.bor => Borland makefile (uses bcc)
|
makefile.bor => Borland makefile (uses bcc)
|
||||||
makefile.cegcc => minge32ce for Windows CE makefile
|
makefile.cegcc => minge32ce for Windows CE makefile
|
||||||
makefile.darwin => Darwin makefile, can use on MacosX
|
makefile.darwin => Darwin makefile, for macOS (formerly Mac OS X)
|
||||||
makefile.dec => DEC Alpha UNIX makefile
|
makefile.dec => DEC Alpha UNIX makefile
|
||||||
makefile.dj2 => DJGPP 2 makefile
|
makefile.dj2 => DJGPP 2 makefile
|
||||||
makefile.freebsd => FreeBSD makefile
|
makefile.freebsd => FreeBSD makefile
|
||||||
@ -30,17 +30,17 @@ pnglibconf.h.prebuilt => Stores configuration settings
|
|||||||
makefile.intel => Intel C/C++ version 4.0 and later
|
makefile.intel => Intel C/C++ version 4.0 and later
|
||||||
makefile.mips => MIPS makefile
|
makefile.mips => MIPS makefile
|
||||||
makefile.msc => Microsoft C makefile
|
makefile.msc => Microsoft C makefile
|
||||||
makefile.netbsd => NetBSD/cc makefile, makes libpng.so.
|
makefile.netbsd => NetBSD/cc makefile, makes shared libpng.so
|
||||||
makefile.openbsd => OpenBSD makefile
|
makefile.openbsd => OpenBSD makefile
|
||||||
makefile.os2 => OS/2 Makefile (gcc and emx, requires libpng.def)
|
makefile.os2 => OS/2 Makefile (gcc and emx, requires libpng.def)
|
||||||
makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
|
makefile.sco => SCO OSr5 ELF and Unixware 7 with Native cc
|
||||||
makefile.sggcc => Silicon Graphics makefile
|
makefile.sggcc => Silicon Graphics makefile
|
||||||
(gcc, creates libpng16.so.16.1.6.*)
|
(gcc, creates shared libpng16.so.16.1.6.*)
|
||||||
makefile.sgi => Silicon Graphics IRIX makefile (cc, creates static lib)
|
makefile.sgi => Silicon Graphics IRIX makefile (cc, creates static lib)
|
||||||
makefile.solaris => Solaris 2.X makefile
|
makefile.solaris => Solaris 2.X makefile
|
||||||
(gcc, creates libpng16.so.16.1.6.*)
|
(gcc, creates shared libpng16.so.16.1.6.*)
|
||||||
makefile.so9 => Solaris 9 makefile
|
makefile.so9 => Solaris 9 makefile
|
||||||
(gcc, creates libpng16.so.16.1.6.*)
|
(gcc, creates shared libpng16.so.16.1.6.*)
|
||||||
makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
|
makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
|
||||||
makefile.sunos => Sun makefile
|
makefile.sunos => Sun makefile
|
||||||
makefile.32sunu => Sun Ultra 32-bit makefile
|
makefile.32sunu => Sun Ultra 32-bit makefile
|
||||||
@ -57,20 +57,20 @@ Other supporting scripts:
|
|||||||
libpng-config-body.in => used by several makefiles to create libpng-config
|
libpng-config-body.in => used by several makefiles to create libpng-config
|
||||||
libpng-config-head.in => used by several makefiles to create libpng-config
|
libpng-config-head.in => used by several makefiles to create libpng-config
|
||||||
libpng.pc.in => Used by several makefiles to create libpng.pc
|
libpng.pc.in => Used by several makefiles to create libpng.pc
|
||||||
pngwin.rc => Used by the visualc71 project.
|
pngwin.rc => Used by the visualc71 project
|
||||||
pngwin.def => Used by makefile.os2
|
pngwin.def => Used by makefile.os2
|
||||||
pngwin.dfn => Used to maintain pngwin.def
|
pngwin.dfn => Used to maintain pngwin.def
|
||||||
SCOPTIONS.ppc => Used with smakefile.ppc
|
SCOPTIONS.ppc => Used with smakefile.ppc
|
||||||
|
|
||||||
checksym.awk => Used for maintaining pnglibconf.h
|
checksym.awk => Used for maintaining pnglibconf.h
|
||||||
def.dfn => Used for maintaining pnglibconf.h
|
def.dfn => Used for maintaining pnglibconf.h
|
||||||
options.awk => Used for maintaining pnglibconf.h
|
options.awk => Used for maintaining pnglibconf.h
|
||||||
pnglibconf.dfa => Used for maintaining pnglibconf.h
|
pnglibconf.dfa => Used for maintaining pnglibconf.h
|
||||||
pnglibconf.mak => Used for maintaining pnglibconf.h
|
pnglibconf.mak => Used for maintaining pnglibconf.h
|
||||||
sym.dfn => Used for symbol versioning
|
sym.dfn => Used for symbol versioning
|
||||||
symbols.def => Used for symbol versioning
|
symbols.def => Used for symbol versioning
|
||||||
symbols.dfn => Used for symbol versioning
|
symbols.dfn => Used for symbol versioning
|
||||||
vers.dfn => Used for symbol versioning
|
vers.dfn => Used for symbol versioning
|
||||||
|
|
||||||
libtool.m4 => Used by autoconf tools
|
libtool.m4 => Used by autoconf tools
|
||||||
ltoptions.m4 => Used by autoconf tools
|
ltoptions.m4 => Used by autoconf tools
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user