FLAT_LIB_STOP_MOTION represents a sprite animation as a sequence of CG
frames. A stop_motion library specifies a base CG file (e.g. "foo.png");
at load time, parts_flat_load() discovers numbered frame variants
("foo_01.png", "foo_02.png", ...) and builds a frame list.
At render time, the active frame is resolved from the local timeline
clock using three parameters:
- span: number of timeline ticks each frame is displayed
- loop_type: 0 = play once and stop at last frame,
1 = loop forward,
2 = ping-pong (forward then backward)
- local: the timeline's current local time
kichikuou
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