James Zern e4886716d3 anim_decode: fix alpha blending with big-endian
images are decoded in RGBA/BGRA, but represented as uint32_t during the
blend process; this fixes the channel extraction

Bug: webp:548
Change-Id: Ie74aa43d8f87d3552d5afc0abba466335f5d1617
2021-12-22 17:03:58 -08:00
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