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[clip] During _clip() limit the extracted traps to the current clip extents

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By applying a tight _cairo_traps_limit() we can reduce the amount of work
we need to do when tessellating the path and extracting the trapezoids.
This commit is contained in:
Chris Wilson 2009-06-17 14:46:53 +01:00
parent 650b85ec77
commit 394e139213
1 changed files with 35 additions and 4 deletions
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39
src/cairo-clip.c
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@ -626,9 +626,10 @@ _cairo_clip_clip (cairo_clip_t *clip,
cairo_surface_t *target)
{
cairo_status_t status;
cairo_rectangle_int_t rectangle;
cairo_rectangle_int_t limits, extents;
cairo_traps_t traps;
cairo_box_t ignored_box;
cairo_bool_t have_limits;
if (clip->all_clipped)
return CAIRO_STATUS_SUCCESS;
@ -662,13 +663,43 @@ _cairo_clip_clip (cairo_clip_t *clip,
_cairo_traps_init (&traps);
/* Limit the traps to the target surface
/* Limit the traps to the target surface and current clip
* - so we don't add more traps than needed. */
status = _cairo_surface_get_extents (target, &rectangle);
have_limits = FALSE;
if (clip->region != NULL) {
cairo_region_get_extents (clip->region, &limits);
have_limits = TRUE;
}
if (clip->surface != NULL) {
if (have_limits) {
if (! _cairo_rectangle_intersect (&limits, &clip->surface_rect)) {
_cairo_clip_set_all_clipped (clip, target);
return CAIRO_STATUS_SUCCESS;
}
} else {
limits = clip->surface_rect;
have_limits = TRUE;
}
}
status = _cairo_surface_get_extents (target, &extents);
if (status == CAIRO_STATUS_SUCCESS) {
if (have_limits) {
if (! _cairo_rectangle_intersect (&limits, &extents)) {
_cairo_clip_set_all_clipped (clip, target);
return CAIRO_STATUS_SUCCESS;
}
} else {
limits = extents;
have_limits = TRUE;
}
}
if (have_limits) {
cairo_box_t box;
_cairo_box_from_rectangle (&box, &rectangle);
_cairo_box_from_rectangle (&box, &limits);
_cairo_traps_limit (&traps, &box);
}