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463b81de2b
Black isn't always just memset(ptr, 0, size). Limited YUV in particular
requires relatively non-obvious values, and filling a frame with
repeating 0 bytes is disallowed in some contexts. With component sizes
larger than 8 or packed YUV, this can become relatively complicated. So
having a generic function for this seems helpful.
In order to handle the complex cases in a generic way without destroying
performance, this code attempts to compute a black pixel, and then uses
that value to clear the image data quickly by using a function like
memset.
Common cases like yuv410p10 or rgba can't be handled with a simple
memset, so there is some code to fill memory with 2/4/8 byte patterns.
For the remaining cases, a generic slow fallback is used.
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Merged from Libav commit
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| .. | ||
| doxy | ||
| examples | ||
| .gitignore | ||
| APIchanges | ||
| authors.texi | ||
| bitstream_filters.texi | ||
| bootstrap.min.css | ||
| build_system.txt | ||
| codecs.texi | ||
| decoders.texi | ||
| default.css | ||
| demuxers.texi | ||
| developer.texi | ||
| devices.texi | ||
| doxy-wrapper.sh | ||
| Doxyfile | ||
| encoders.texi | ||
| errno.txt | ||
| faq.texi | ||
| fate_config.sh.template | ||
| fate.texi | ||
| ffmpeg-bitstream-filters.texi | ||
| ffmpeg-codecs.texi | ||
| ffmpeg-devices.texi | ||
| ffmpeg-filters.texi | ||
| ffmpeg-formats.texi | ||
| ffmpeg-protocols.texi | ||
| ffmpeg-resampler.texi | ||
| ffmpeg-scaler.texi | ||
| ffmpeg-utils.texi | ||
| ffmpeg.texi | ||
| ffmpeg.txt | ||
| ffplay.texi | ||
| ffprobe.texi | ||
| ffprobe.xsd | ||
| ffserver.conf | ||
| ffserver.texi | ||
| fftools-common-opts.texi | ||
| filter_design.txt | ||
| filters.texi | ||
| formats.texi | ||
| general.texi | ||
| git-howto.texi | ||
| indevs.texi | ||
| issue_tracker.txt | ||
| lexicon | ||
| libav-merge.txt | ||
| libavcodec.texi | ||
| libavdevice.texi | ||
| libavfilter.texi | ||
| libavformat.texi | ||
| libavutil.texi | ||
| libswresample.texi | ||
| libswscale.texi | ||
| Makefile | ||
| metadata.texi | ||
| mips.txt | ||
| multithreading.txt | ||
| muxers.texi | ||
| nut.texi | ||
| optimization.txt | ||
| outdevs.texi | ||
| patchwork | ||
| platform.texi | ||
| print_options.c | ||
| protocols.texi | ||
| rate_distortion.txt | ||
| resampler.texi | ||
| scaler.texi | ||
| snow.txt | ||
| style.min.css | ||
| swresample.txt | ||
| swscale.txt | ||
| t2h.init | ||
| t2h.pm | ||
| tablegen.txt | ||
| texi2pod.pl | ||
| texidep.pl | ||
| undefined.txt | ||
| utils.texi | ||
| writing_filters.txt | ||