The ICM_DRAW_START message is sent to a rendering driver to start its internal clock for the timing of drawing frames.
None.
This message is used only by hardware that does its own asynchronous decompression, timing, and drawing.
When it receives this message, the driver should start rendering data at the rate specified with ICM_DRAW_BEGIN.
The ICM_DRAW_START and ICM_DRAW_STOP messages do not nest. If your driver receives ICM_DRAW_START before rendering is stopped with ICM_DRAW_STOP, it should restart rendering with new parameters.