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When you copy pixels to a surface using either IDirectDrawSurface5::Bltor IDirectDrawSurface5::BltFast, the method might fail with DDERR_WASSTILLDRAWINGbecause the hardware blitter was not ready to accept the command.
If your application has no urgent business to perform while waiting for the blitter to come back into a state of readiness, you can specify the DDBLT_WAIT flag in the dwFlagsparameter of Blt, or the equivalent DDBLTFAST_WAIT flag for BltFast. The flag causes the method to wait until the blit can be handed off to the blitter (or until an error other than DDERR_WASSTILLDRAWING occurs).
Bltaccepts another flag, DDBLT_ASYNC, that takes advantage of any hardware FIFO (first in, first out) queuing capabilities.
Last updated on Tuesday, May 18, 2004