<div dir="ltr"><div>When you call _intersect_rect and pass it an empty rectangle, it creates an invalid region from that rectangle. The only valid empty region is the one where the data pointer points to pixman_region_empty_data. The region created by _intersect_rect has a null data pointer, and so _not_empty returns true for it even if the extents are empty. This patch uses code similar to what's in _union_rect to handle empty rectangles. --- pixman/pixman-region.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/pixman/pixman-region.c b/pixman/pixman-region.c index 59bc9c7..95911db 100644 --- a/pixman/pixman-region.c +++ b/pixman/pixman-region.c @@ -1329,16 +1329,25 @@ PREFIX(_intersect_rect) (region_type_t *dest, region_type_t region; region.data = NULL; region.extents.x1 = x; region.extents.y1 = y; region.extents.x2 = x + width; region.extents.y2 = y + height; + if (!GOOD_RECT (&region.extents)) + { + if (BAD_RECT (&region.extents)) + _pixman_log_error (FUNC, "Invalid rectangle passed"); + FREE_DATA (dest); + PREFIX (_init) (dest); + return TRUE; + } + return PREFIX(_intersect) (dest, source, &region); } /* Convenience function for performing union of region with a * single rectangle */ */ PIXMAN_EXPORT pixman_bool_t PREFIX (_union_rect) (region_type_t *dest, -- 2.7.0 </div></div>