GUAC-687: Do not allow empty updates to the dirty rect.
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@ -112,7 +112,7 @@ static void __guac_common_bound_rect(guac_common_surface* surface, guac_common_r
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* @return Non-zero if the update should be combined with any existing update,
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* zero otherwise.
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*/
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static int __guac_common_should_combine(guac_common_surface* surface, guac_common_rect* rect, int rect_only) {
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static int __guac_common_should_combine(guac_common_surface* surface, const guac_common_rect* rect, int rect_only) {
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if (surface->dirty) {
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@ -166,7 +166,11 @@ static int __guac_common_should_combine(guac_common_surface* surface, guac_commo
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* @param surface The surface to mark as dirty.
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* @param rect The rectangle of the update which is dirtying the surface.
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*/
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static void __guac_common_mark_dirty(guac_common_surface* surface, guac_common_rect* rect) {
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static void __guac_common_mark_dirty(guac_common_surface* surface, const guac_common_rect* rect) {
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/* Ignore empty rects */
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if (rect->width <= 0 || rect->height <= 0)
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return;
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/* If already dirty, update existing rect */
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if (surface->dirty)
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