[comp.graphics] Bit Image animation

meo3@jaguar.ucs.uofs.edu (OGRINZ MICHAEL E) (03/07/91)

	Hello there. I've been doing some independent coursework here
regarding the manipulation of bit-images in Turbo C++. Anyway, I've
been trying to animate a multicolor image over a multicolor background.
Currently, I can only acheive this by first displaying a "mask" (a
white image in the shape of my multicolor bit image) which is OR'ed with
the background. I then XOR my multicolor image on top of the mask. As
you might infer, this takes a lot of time, and of course; I want speed.
The SET operation in Turbo C++ would let me drop in a bit image in only
one instruction, but it drops in the entire (square) image (I am displaying
non-rectangular forms). Any comments or suggestions on some more efficent
way to quickly implement the equivalent of sprites on the PC would be
greatly appreciated.

	Thanks in advance.

	Michael Ogrinz