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6585075f8a
if src_{r,g,b} = 0, any value of src_a or dst_a such that
abs(src_a - dst_a) <= max_allowed_diff
was making the test pass, despite being very different-looking pixels.
The fix is to require same values for src_a and dst_a before attempting
an r/g/b comparison.
Change-Id: If3a55a229eab3904ed454f20065e49e35c39f25c