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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
Version: 1.6.16
License: libpng license
License File: LICENSE, pulled out of png.h
Description: png compression/decompression library
Enable both static and dynamically linked libpng All platforms except android are configured to use the statically linked copy of libpng. Android uses the system provided dynamic copy for SkImageDecoder and the static copy for SkCodec. The exception being android framework builds that currently use the dynamic copy everywhere. This CL also enables NEON optimizations for libpng. Review URL: https://codereview.chromium.org/1058823002
2015-04-03 19:35:27 +00:00
Local Modifications: (1) Created pnglibconf.h from pnglibconf.h.prebuilt (a
rename with a few additional settings enabled). (2) Created pngprefix.h
that is required when using the PNG_PREFIX define. (3) Pulled LICENSE into
its own file.
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
FAQ:
Q: Why does this directory exist?
A: libpng is pulled in through DEPS, but in order to build it using ninja, we
Enable both static and dynamically linked libpng All platforms except android are configured to use the statically linked copy of libpng. Android uses the system provided dynamic copy for SkImageDecoder and the static copy for SkCodec. The exception being android framework builds that currently use the dynamic copy everywhere. This CL also enables NEON optimizations for libpng. Review URL: https://codereview.chromium.org/1058823002
2015-04-03 19:35:27 +00:00
need to create pnglibconf.h and pngprefix.h. We originally tried creating
the file as an action in https://codereview.chromium.org/930283002/, but this
apparently led to a race condition on Windows, where some builds failed to
create the file in time for other files to include it. By checking these
files directly into Skia, we eliminate the race condition.
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