Re: XGetImage returning blank images
Re: XGetImage returning blank images
John Rieffel wrote:
> Anyhow, they've built rudimentary frame-grabbing of openGL rendered
> windows via XGetImage. This works fine on the linux machine, but on
> the mac all of the images are blank (0 values). What distinction is
> there between the two X11 servers that might cause this?
I don't know for sure, but my guess would be that the X11 and OpenGL
framebuffers are not unified. That is, OpenGL probably goes down a
different path (to CGL, probably) than X11 sees. Thus, when X11 is
asked for its frame buffer via XGetImage, it has nothing to contribute
other than 0s.
Of course, this is speculation on my part.
-Sean
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