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skia2/third_party/libpng/README.google

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Add SkCodec, including PNG implementation. DM: Add a flag to use SkCodec instead of SkImageDecoder. SkCodec: Base class for codecs, allowing creation from an SkStream or an SkData. An SkCodec, on creation, knows properties of the data like its width and height. Further calls can be used to generate the image. TODO: Add scanline iterator SkPngCodec: New decoder for png. Wraps libpng. The code has been repurposed from SkImageDecoder_libpng. TODO: Handle other destination colortypes TODO: Substitute the transpose color TODO: Allow silencing warnings TODO: Use RGB instead of filler? TODO: sRGB SkSwizzler: Simplified version of SkScaledSampler. Unlike the sampler, this object does no sampling. TODO: Implement other swizzles. Requires a gclient sync to pull down libpng. BUG=skia:3257 Committed: https://skia.googlesource.com/skia/+/ca358852b4fed656d11107b2aaf28318a4518b49 (and then reverted) Review URL: https://codereview.chromium.org/930283002
2015-03-03 16:59:20 +00:00
URL: http://www.libpng.org/pub/png/libpng.html
Check libpng directly into third_party/ With this change, the CMake build, which does not use DEPS to sync external projects, is able to build and use the same version of libpng that is used in other builds. This will allow all platforms (including Google3 CMake build) to test on the same version of libpng, so we do not need to make SkPngCodec support all versions of libpng. - Update CMakeLists.txt to use the checked in libpng. - Check in libpng version 1.6.22rc01 - Update README.google - Replace our old LICENSE file with the latest one from libpng GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2033063003 CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot Review-Url: https://codereview.chromium.org/2033063003
2016-06-02 19:59:59 +00:00
Version: 1.6.22rc01
Add SkCodec, including PNG implementation. DM: Add a flag to use SkCodec instead of SkImageDecoder. SkCodec: Base class for codecs, allowing creation from an SkStream or an SkData. An SkCodec, on creation, knows properties of the data like its width and height. Further calls can be used to generate the image. TODO: Add scanline iterator SkPngCodec: New decoder for png. Wraps libpng. The code has been repurposed from SkImageDecoder_libpng. TODO: Handle other destination colortypes TODO: Substitute the transpose color TODO: Allow silencing warnings TODO: Use RGB instead of filler? TODO: sRGB SkSwizzler: Simplified version of SkScaledSampler. Unlike the sampler, this object does no sampling. TODO: Implement other swizzles. Requires a gclient sync to pull down libpng. BUG=skia:3257 Committed: https://skia.googlesource.com/skia/+/ca358852b4fed656d11107b2aaf28318a4518b49 (and then reverted) Review URL: https://codereview.chromium.org/930283002
2015-03-03 16:59:20 +00:00
License: libpng license
License File: LICENSE, pulled out of png.h
Description: png compression/decompression library
Update libpng to 1.6.22rc01 If there are no issues, this version will be released May 26. Let's start testing with it, so we are ready to update Chrome when it is available. BUG=skia:4710 GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1983853002 Review-Url: https://codereview.chromium.org/1983853002
2016-05-17 16:31:04 +00:00
Local Modifications:
Prefix png functions This way multiple copies of libpng can coexist. Update libpng's README.google GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2046603002 Review-Url: https://codereview.chromium.org/2046603002
2016-06-06 15:57:50 +00:00
(1) Created pnglibconf.h from pnglibconf.h.prebuilt. This
is mostly a rename, with Skia-specific settings at the end.
The only difference is for pngprefix.h.
Check libpng directly into third_party/ With this change, the CMake build, which does not use DEPS to sync external projects, is able to build and use the same version of libpng that is used in other builds. This will allow all platforms (including Google3 CMake build) to test on the same version of libpng, so we do not need to make SkPngCodec support all versions of libpng. - Update CMakeLists.txt to use the checked in libpng. - Check in libpng version 1.6.22rc01 - Update README.google - Replace our old LICENSE file with the latest one from libpng GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2033063003 CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot Review-Url: https://codereview.chromium.org/2033063003
2016-06-02 19:59:59 +00:00
(2) Included Intel optimizations by running:
Update libpng to 1.6.22rc01 If there are no issues, this version will be released May 26. Let's start testing with it, so we are ready to update Chrome when it is available. BUG=skia:4710 GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1983853002 Review-Url: https://codereview.chromium.org/1983853002
2016-05-17 16:31:04 +00:00
"patch -i contrib/intel/intel_sse.patch -p1"
Check libpng directly into third_party/ With this change, the CMake build, which does not use DEPS to sync external projects, is able to build and use the same version of libpng that is used in other builds. This will allow all platforms (including Google3 CMake build) to test on the same version of libpng, so we do not need to make SkPngCodec support all versions of libpng. - Update CMakeLists.txt to use the checked in libpng. - Check in libpng version 1.6.22rc01 - Update README.google - Replace our old LICENSE file with the latest one from libpng GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2033063003 CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot Review-Url: https://codereview.chromium.org/2033063003
2016-06-02 19:59:59 +00:00
(3) Removed files unused by Skia
Fix undefined behavior in libpng Check for a null source before calling memcpy. BUG=skia:5390 GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2040433002 Review-Url: https://codereview.chromium.org/2040433002
2016-06-03 16:36:53 +00:00
(4) Fixed an undefined behavior bug (skbug.com/5390)
Prefix png functions This way multiple copies of libpng can coexist. Update libpng's README.google GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2046603002 Review-Url: https://codereview.chromium.org/2046603002
2016-06-06 15:57:50 +00:00
(5) Add pngprefix.h, so multiple versions of libpng can
coexist.
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