Transparent BITBLT Raster OP code (ROP) ???

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1 total messages Started by Tommie Daniel Wed, 27 Jan 1993 16:40

#2365

Author: Tommie Daniel
Date: Wed, 27 Jan 1993 16:40

8 lines
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Is there a ROP code to accomplish a transparent blit in 256 color modes.

In other words,  if I have an off screen image with a black background
(index 0) and I want to bitblt it on top of an existing 256 color
scene, how do I allow only the non-black portion of the off screen image 
to be drawn?

thanks,  Tommie Daniel   daniel@unm.edu

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