# note: A background colour that is neither white nor transparent.
# expect: reject
# anim: ok
# info: ok
# exercises: ANIM's first four bytes. The demuxer reads them into
#   dmux->bgcolor and hands them to the caller, and that is all: the
#   animation decoder zero-fills its canvas for a key frame rather than
#   filling it with this, so the field cannot change a pixel of the output.
#   Written so that a decoder that started obeying it would fail the hash.
background_color 0x8040c020
loop_count 3
frame
frame_duration 100
lossless
width 16
height 16
argb 0xff800000 x256