# note: A compressed alpha plane written as plain green literals.
# expect: ok
# exercises: The simplest compressed plane there is: no transform, so
#   Is8bOptimizable() is never consulted and the plane goes through
#   DecodeImageData() with ExtractAlphaRows() pulling the green channel out
#   of a full ARGB buffer. The alpha value is the green symbol, which is why
#   this needs no palette to say anything.
chunks VP8X ALPH VP8
alpha 1
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
alph_plane
pixels 200 x256