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[xlib] Fast-path the likely case of retrieving a known xrender_format

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If we know the CPU can read pointers atomically, then we can simply peek
into the cached_xrender_formats to see if we already have a match, before
taking the mutex. (Acquiring the mutex here is a minor nuisance that
appears on the callgrind profiles.)
This commit is contained in:
Chris Wilson 2009-07-27 10:14:24 +01:00
parent efb3445ee1
commit 09a2b2ed31
1 changed files with 6 additions and 0 deletions
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6
src/cairo-xlib-display.c
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@ -514,6 +514,12 @@ _cairo_xlib_display_get_xrender_format (cairo_xlib_display_t *display,
{
XRenderPictFormat *xrender_format;
#if ! ATOMIC_OP_NEEDS_MEMORY_BARRIER
xrender_format = display->cached_xrender_formats[format];
if (likely (xrender_format != NULL))
return xrender_format;
#endif
CAIRO_MUTEX_LOCK (display->mutex);
xrender_format = display->cached_xrender_formats[format];
if (xrender_format == NULL) {