# note: A compressed alpha plane flagged as level-reduced.
# expect: ok
# exercises: ALPHA_PREPROCESSED_LEVELS on a compressed plane. The bit makes
#   the decoder take the "decode everything in one pass" branch rather than
#   the row-by-row one, which here means the whole lossless stream is read
#   before any of it is handed on. WebPDequantizeLevels() is then called
#   with the dithering strength, which is zero unless the caller asks for
#   it, so the plane comes out unchanged: this pins the control path, not
#   the pixels. alph-raw-preprocessing is the same bit on a stored plane.
chunks VP8X ALPH VP8
alpha 1
alph_preprocessing 1
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
alph_plane
transforms color_indexing
palette_colors 0x00000000 0x0000c800 0x0000ff00
pixels 0x24 x64