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traps: Clip the trapezoid extents against the clip extents

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Just in case the clip polygon turns out to be much larger than the
operation extents (silly us for not reducing it correctly) and lead to
catastrophe, such as:

Program received signal SIGSEGV, Segmentation fault.
pixman_fill_sse2 (bits=<optimized out>, stride=4, bpp=8, x=0, y=0,
width=3, height=-34811, data=0) at pixman-sse2.c:3369
3369		    *(uint16_t *)d = data;

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-04-08 17:58:13 +01:00
parent 6f28f0b33c
commit 113ec6bf0c
1 changed files with 7 additions and 2 deletions
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9
src/cairo-traps-compositor.c
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@ -218,8 +218,13 @@ combine_clip_as_traps (const cairo_traps_compositor_t *compositor,
_cairo_traps_fini (&traps);
cairo_surface_destroy (src);
if (status == CAIRO_INT_STATUS_SUCCESS &&
(fixup.width < extents->width || fixup.height < extents->height)) {
if (unlikely (status))
return status;
if (! _cairo_rectangle_intersect (&fixup, extents))
return CAIRO_STATUS_SUCCESS;
if (fixup.width < extents->width || fixup.height < extents->height) {
cairo_boxes_t clear;
_cairo_boxes_init (&clear);