[PATCH 15/20] glamor: Provide a placeholder for glamor_pushpixels

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> This just calls miPushPixels until glamor uses FBOs for bitmaps

The only cases that PushPixels() is called that I can find:

- miglblt.c

We're doing hand-accelerated glyph blits, so that's gone.

- miarc.c

I tried a few likely x11perfs and nothing hit it.  Eventually I came up with
on -wpcircle100 -rop GXnand, and this patch was 1.5% faster while
removing apparent rendering bugs.

- midispur.c

I don't think this is a thing we're worried about.
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