You don't have to copy from the back buffer to the front buffer until glFlush() or glFinish() are called. That's assuming that glReadBuffer(GL_FRONT); glReadPixels(...) grabs pixels from the back color buffer. If that's not true, you'd have to do the buffer copy before each glReadPixels().
Thats a reasonable optimization, but the basic technique is flawed -- it's probably possible to get the correct behaviour of a single-buffered visual in this way, but it's not going to be compliant at all for a double-buffered visual where the app is switching between drawing to the front & back buffers.
Keith
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