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[clip] Intersect to region extents.

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When querying the intersection of a rectangle with the clip region, the
result only depends upon the region extents so we do not need to perform
an expensive region-region intersection computation.
This commit is contained in:
Chris Wilson 2008-12-10 23:45:44 +00:00
parent c5acb125e9
commit 09589e20e1
2 changed files with 5 additions and 14 deletions
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18
src/cairo-clip.c
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@ -179,20 +179,12 @@ _cairo_clip_intersect_to_rectangle (cairo_clip_t *clip,
} }
if (clip->has_region) { if (clip->has_region) {
cairo_region_t intersection; cairo_rectangle_int_t extents;
_cairo_region_init_rect (&intersection, rectangle); _cairo_region_get_extents (&clip->region, &extents);
is_empty = _cairo_rectangle_intersect (rectangle, &extents);
status = _cairo_region_intersect (&intersection, &clip->region, if (is_empty)
&intersection); return CAIRO_STATUS_SUCCESS;
if (!status)
_cairo_region_get_extents (&intersection, rectangle);
_cairo_region_fini (&intersection);
if (unlikely (status))
return status;
} }
if (clip->surface) if (clip->surface)

1
src/cairo-surface-fallback.c
View file

@ -578,7 +578,6 @@ _clip_and_composite_trapezoids (const cairo_pattern_t *src,
has_clear_region = TRUE; has_clear_region = TRUE;
status = _cairo_clip_intersect_to_region (clip, &clear_region); status = _cairo_clip_intersect_to_region (clip, &clear_region);
if (unlikely (status)) if (unlikely (status))
goto out; goto out;