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Double buffering scheme in XLib

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I've got another XLib question. Since I'm no longer running XLib as blocking on events and have it drawing each frame, I need to setup a double buffer. I guess two things I need are: 1) a way to do a fast clear or full blit to a display buffer 2) a way to setup two display buffers, so that I can write to an offscreen buffer and then switch the offscreen buffer to the screen buffer and the screen buffer to the offscreen buffer. If anyone can give me some guidelines, please advise. I've been reading the official XLib Manual, but it doesn't seem to help in this regard (probably because it is assumming single buffer event blocking applications).

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