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[clip] Limit traps.

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Apply prior knowledge to limit the traps during clipping to avoid
generating extra work.
This commit is contained in:
Chris Wilson 2008-09-24 11:32:11 +01:00
parent c36a242303
commit 7357e80054
1 changed files with 16 additions and 2 deletions
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18
src/cairo-clip.c
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@ -148,7 +148,10 @@ _cairo_clip_path_intersect_to_rectangle (cairo_clip_path_t *clip_path,
cairo_box_t extents;
cairo_rectangle_int_t extents_rect;
_cairo_box_from_rectangle (&extents, rectangle);
_cairo_traps_init (&traps);
_cairo_traps_limit (&traps, &extents);
status = _cairo_path_fixed_fill_to_traps (&clip_path->path,
clip_path->fill_rule,
@ -436,9 +439,8 @@ _cairo_clip_intersect_mask (cairo_clip_t *clip,
/* Intersect with the target surface rectangle so we don't use
* more memory and time than we need to. */
status = _cairo_surface_get_extents (target, &target_rect);
if (!status)
if (status == CAIRO_STATUS_SUCCESS)
_cairo_rectangle_intersect (&surface_rect, &target_rect);
if (surface_rect.width == 0 || surface_rect.height == 0) {
@ -561,6 +563,7 @@ _cairo_clip_clip (cairo_clip_t *clip,
cairo_surface_t *target)
{
cairo_status_t status;
cairo_rectangle_int_t rectangle;
cairo_traps_t traps;
if (clip->all_clipped)
@ -582,6 +585,17 @@ _cairo_clip_clip (cairo_clip_t *clip,
return status;
_cairo_traps_init (&traps);
/* Limit the traps to the target surface
* - so we don't add more traps than needed. */
status = _cairo_surface_get_extents (target, &rectangle);
if (status == CAIRO_STATUS_SUCCESS) {
cairo_box_t box;
_cairo_box_from_rectangle (&box, &rectangle);
_cairo_traps_limit (&traps, &box);
}
status = _cairo_path_fixed_fill_to_traps (path,
fill_rule,
tolerance,