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authorwm4 <nfxjfg@googlemail.com>2017-07-22 23:05:14 +0200
committerAnton Khirnov <anton@khirnov.net>2017-07-26 23:21:26 +0200
commit45df7adc1d9b7e8fbae5af9328baa6ab3562002b (patch)
tree33f68a6fd0c5813e702bf0f9d684094c27dad322 /libavcodec/h264dec.h
parent47399ccdfd93d337c96c76fbf591f0e3637131ef (diff)
downloadffmpeg-45df7adc1d9b7e8fbae5af9328baa6ab3562002b.tar.gz
imgutils: add function to clear an image to black
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>
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