Emma Anholt authored Jun 18, 2015 and Adam Jackson committed Mar 11, 2016

If a pixmap isn't getting exported as a dmabuf, then we don't need to
make an EGLImage/GBM bo for it.  This should reduce normal pixmap
allocation overhead, and also lets the driver choose non-scanout
formats which may be much higher performance.

On Raspberry Pi, where scanout isn't usable as a texture source, this
improves x11perf -copypixwin100 from about 4300/sec to 5780/sec under
xcompmgr -a, because we no longer need to upload our x11perf window to
a tiled temporary in order to render it to the screen.

v2: Just use pixmap->usage_hint instead of a new field.  Drop the
    changes that started storing gbm_bos in the pixmap priv due to
    lifetime issues.
v3: Fix a missing gbm_bo_destroy() on the pixmap-from-fd success path.

[ajax: Restore glamor_egl_create_argb8888_based_texture for ABI reasons.
I'm not aware of any driver using it directly, but.]

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
(cherry picked from commit 51984ddd)