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Added workaround for X servers which don't properly support texture_for_pixmap,
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based on how Beryl works around the problem. Define LIBCM_TFP if you *can* do
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TFP and you want libcm to use it; default if LIBCM_TFP is not defined is to
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use non-TFP mode. Non-TFP mode should work more generally and often be faster.
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Kudos to Travis Watkins for the suggestion, who cautions that TFP mode will
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often be necessary for video and games.