# note: A losslessly compressed alpha plane carrying a palette transform,
#   from a cwebp encode of a two-valued plane.
# expect: ok
# exercises: The one shape that reaches DecodeAlphaData(): exactly one
#   transform, that transform colour-indexing, no colour cache, and the red,
#   blue and alpha codes each a single symbol. That is the lossless
#   decoder's 8-bit mode, a different loop from the one every VP8L file here
#   takes. This one is real encoder output, which is what it is for: the
#   alph-plane-* cases reach the same loop from a written case, and can be
#   made to miss it one condition at a time.
chunks VP8X ALPH VP8
alpha 1
alph_compression 1
alph_data 0f30ff111142209020ec6fb9440e11fdcf8909
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
coeffs y[2] 1:5 -3