macro notifies a rendering driver to start its internal clock for the timing
of drawing frames. You can use this macro or explicitly call the ICM_DRAW_START
Handle of a driver.
This macro does not return a value.
This message is used by hardware that performs its own asynchronous
decompression, timing, and drawing.
When the driver receives this message, it should start rendering data at the
rate specified with the ICM_DRAW_BEGIN message.
macros do not nest. If your driver receives ICDrawStart
before rendering is stopped with ICDrawStop
, it should restart rendering with new parameters.
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