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glamor: Make pixmap exportable from `gbm_bo_from_pixmap()`

Olivier Fourdan requested to merge ofourdan/xserver:issue68 into master

If a pixmap is not exportable, glamor_gbm_bo_from_pixmap() would fail and the modesettings driver would consequently fail to do its page flip, which both prevents Present from working and also fill up the logs with error messages such as:

(EE) modeset(0): Failed to get GBM bo for flip to new front. (EE) modeset(0): present flip failed

Refactor the code so that glamor_gbm_bo_from_pixmap() takes care of making the pixmap exportable.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com Signed-off-by: Yuxuan Shui yshui@hadean.com See-also: !131 (closed) Closes: #68 (closed) Fixes: 86b2d874 "glamor: Reallocate pixmap storage without modifiers if necessary"

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