зеркало из https://github.com/mozilla/gecko-dev.git
b7811b117b
This patch implements the transparency support for AVIF image files.
To convert the decoded YCbCr and Alpha data to RGBA, a function named
`ConvertYCbCrAToARGB` is created to do this job in the following
procedure:
ConvertYCbCrAToARGB:
If the layout of the YCbCr is I420
Calling libyuv::I420AlphaToARGB
Else
Fill RGB data converted by ConvertYCbCrToRGB in ARGB buffer first
Insert the alpha data to ARGB buffer
On the other hand, this patch refactors the nsAVIFDecoder a bit to make
the lifetime of the parsed data and decoded image data clearer. They
won't live longer than Parser object and {Dav1d, AOM}Decoder object.
This should improve the code readability.
This patch also adds a transparent image test (TransparentAVIFTestCase)
to check the FLAG_HAS_TRANSPARENCY is posted or not. The test image file
`transparent.avif` is from Bug 1654462.
Differential Revision: https://phabricator.services.mozilla.com/D98951
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