# note: A palette-coded alpha plane with an entropy image inside it.
# expect: ok
# unique: alpha_8b_blocks
# exercises: The block loop of DecodeAlphaData(), which nothing else here
#   reaches: with an entropy image the Huffman mask stops being ~0, so the
#   decoder stops reading straight through to the last row and instead walks
#   one tile-sized block at a time, asking GetHtreeGroupForPos() which group
#   each one belongs to. Four tiles down the plane, alternating between two
#   groups, and both groups keep their red, blue and alpha codes single so
#   the 8-bit path still applies.
chunks VP8X ALPH VP8
alpha 1
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
alph_plane
transforms color_indexing
palette_colors 0x00000000 0x0000c800 0x0000ff00
meta_bits 2
meta_tiles 0 1 0 1
pixels 0x24 x16 0x12 x16 0x24 x16 0x12 x16