Autodetect valid SHM transport #5
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Standard code for testing whether the display connections offers the MIT-SHM extension and then verifies that it works (in order to detect and disable SHM over ssh X-tunneling).
A few drivers offer to create Pixmaps out of shared memory as it reduces the overhead associated with ShmPutImage and allows the driver to optimize storage of the pixmap within video memory. Here this means that any redrawing we require is then a simple blit from within video memory, rather than requiring a fresh transfer every time. This is only useful if we redraw of course, but there should be negative consequences from enabling the pixmap path where supported!
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Hi, just stumbled across meh and thought you would appreciate automatic detection of usable shm transport along with support for utilizing ShmPixmaps.