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| author | wm4 <nfxjfg@googlemail.com> | 2017-07-22 23:05:14 +0200 |
|---|---|---|
| committer | wm4 <nfxjfg@googlemail.com> | 2017-08-08 13:37:37 +0200 |
| commit | 463b81de2b252691d75417643597c42684bf830d (patch) | |
| tree | 9fffe9f41caf458bae6492803686e2e2bed418ec /doc | |
| parent | caa12027baf1180453846c58da08fc87accc0ff6 (diff) | |
| download | ffmpeg-463b81de2b252691d75417643597c42684bf830d.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>
Merged from Libav commit 45df7adc1d9b7.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/APIchanges | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/APIchanges b/doc/APIchanges index cd69ec7bc6..c82de684ab 100644 --- a/doc/APIchanges +++ b/doc/APIchanges @@ -15,6 +15,9 @@ libavutil: 2015-08-28 API changes, most recent first: +2017-08-08 - xxxxxxx - lavu 55.72.100 - imgutils.h + Add av_image_fill_black(). + 2017-08-08 - xxxxxxx - lavu 55.71.100 - frame.h Add av_frame_apply_cropping(). |