tree 2a0da70cdcc5ac7ba6852fdf7da3872bc5f3ca15
parent 1851d2e3d1174840a000583e804d52c995e55ba7
author Wan-Teh Chang <wtc@google.com> 1663799682 -0700
committer GitHub <noreply@github.com> 1663799682 -0700
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Use PNG_COLOR_TYPE_GRAY for 8-bit grayscale output

When writing a PNG output file, if the AVIF image is 8-bit monochrome
with no alpha and the PNG output bit depth is 8, use the Y plane of the
AVIF image directly for the PNG_COLOR_TYPE_GRAY color type.

Partially fix https://github.com/AOMediaCodec/libavif/issues/1123.