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Bug 1043 - COGL calls glTexSubImage2D() with out-of-bounds

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values (SIGSEGV)

	* clutter/cogl/gl/cogl-texture.c
	(_cogl_texture_upload_subregion_to_gl): When iterating over the
	slices, discard ones that don't intersect immediatly otherwise it
	will call glTexSubImage2D with a negative width/height and then
	move the source position incorrectly. Thanks to Gwenole
	Beauchesne.
This commit is contained in:
Neil Roberts 2008-10-20 15:54:17 +00:00
parent 238e9c3a1a
commit ae1a4a6a30
1 changed files with 14 additions and 0 deletions
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14
gl/cogl-texture.c
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@ -395,6 +395,13 @@ _cogl_texture_upload_subregion_to_gl (CoglTexture *tex,
_cogl_span_iter_next (&y_iter),
source_y += inter_h )
{
/* Discard slices out of the subregion early */
if (!y_iter.intersects)
{
inter_h = 0;
continue;
}
/* Iterate horizontal spans */
for (source_x = src_x,
_cogl_span_iter_begin (&x_iter, tex->slice_x_spans,
@ -406,6 +413,13 @@ _cogl_texture_upload_subregion_to_gl (CoglTexture *tex,
_cogl_span_iter_next (&x_iter),
source_x += inter_w )
{
/* Discard slices out of the subregion early */
if (!x_iter.intersects)
{
inter_w = 0;
continue;
}
/* Pick intersection width and height */
inter_w = CLUTTER_FIXED_TO_INT (x_iter.intersect_end -
x_iter.intersect_start);