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486fd4145aed93093d1f1655de40c0a8582bb8b1
If the pixel in framebuffer memory isn't modified since we uploaded it, we can just read from the system memory copy, wihch avoids both a readback and an accelerator stall. In principle this function is still wrong, and all the framebuffer pixel access should be going through (w)fb so we can get pixel layout corrections.
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Truly free fork of the XOrg project.
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