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tessellator: Fixed to produce an output box with x1 <= x2 for single box input

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Winding of a box is toggled by swapping x1, x2 coordinates. So
we have to swap those coordinate rather than just copying.

Many routines assume that boxes are left-top to right-bottom
convention. So tessellator should produce such output boxes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Taekyun Kim 2011-06-15 23:23:02 +09:00 • committed by Chris Wilson
parent 3b9c874489
commit 8e7589abcc
1 changed files with 7 additions and 0 deletions
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7
src/cairo-bentley-ottmann-rectangular.c
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@ -739,6 +739,13 @@ _cairo_bentley_ottmann_tessellate_boxes (const cairo_boxes_t *in,
if (unlikely (in->num_boxes == 1)) {
cairo_box_t box = in->chunks.base[0];
_cairo_boxes_clear (out);
if (box.p1.x > box.p2.x) {
cairo_fixed_t tmp = box.p1.x;
box.p1.x = box.p2.x;
box.p2.x = tmp;
}
status = _cairo_boxes_add (out, &box);
assert (status == CAIRO_STATUS_SUCCESS);
return CAIRO_STATUS_SUCCESS;