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polygon-intersect: Exclude non-overlapping clip boxes from consideration

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-09-27 11:13:23 +01:00
parent 3969f2c687
commit 7e856071a2
1 changed files with 14 additions and 8 deletions
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22
src/cairo-polygon-intersect.c
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@ -1394,7 +1394,7 @@ _cairo_polygon_intersect (cairo_polygon_t *a, int winding_a,
if (unlikely (0 == a->num_edges))
return CAIRO_STATUS_SUCCESS;
if (unlikely (b->num_edges == 0)) {
if (unlikely (0 == b->num_edges)) {
a->num_edges = 0;
return CAIRO_STATUS_SUCCESS;
}
@ -1505,16 +1505,22 @@ _cairo_polygon_intersect_with_boxes (cairo_polygon_t *polygon,
_cairo_polygon_init (&b, NULL, 0);
for (n = 0; n < num_boxes; n++) {
cairo_point_t p1, p2;
if (boxes[n].p2.x > polygon->extents.p1.x &&
boxes[n].p1.x < polygon->extents.p2.x &&
boxes[n].p2.y > polygon->extents.p1.y &&
boxes[n].p1.y < polygon->extents.p2.y)
{
cairo_point_t p1, p2;
p1.y = boxes[n].p1.y;
p2.y = boxes[n].p2.y;
p1.y = boxes[n].p1.y;
p2.y = boxes[n].p2.y;
p2.x = p1.x = boxes[n].p1.x;
_cairo_polygon_add_external_edge (&b, &p1, &p2);
p2.x = p1.x = boxes[n].p1.x;
_cairo_polygon_add_external_edge (&b, &p1, &p2);
p2.x = p1.x = boxes[n].p2.x;
_cairo_polygon_add_external_edge (&b, &p2, &p1);
p2.x = p1.x = boxes[n].p2.x;
_cairo_polygon_add_external_edge (&b, &p2, &p1);
}
}
status = _cairo_polygon_intersect (polygon, *winding,