tree 49d1e3b74266671cd3ed7d2db4848e41ffa235d2
parent d7d05ec3c5aecbc14090eec6e432346a56c5e9a4
author Wan-Teh Chang <wtc@google.com> 1681168788 -0700
committer Wan-Teh Chang <wtc@google.com> 1681240078 -0700

avifPNGRead: Don't add alpha filler if no alpha

If the PNG input has no alpha, don't add fully-opaque alpha filler.
Although avifEncoderAddImage() ignores a fully-opaque alpha plane, it
does so only when encoding a single image. When we encode a progressive
image, the current implementation encodes the layers as potentially
different images, so the avifImageIsOpaque() check for a single image is
skipped and the alpha plane is encoded.