sna: Use a cheaper no-reduction damage check for simply discarding further damage

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 16 insertions, 1 deletions

diff --git a/src/sna/sna_damage.c b/src/sna/sna_damage.c
index 7431f39e..4cccbdcd 100644
--- a/src/sna/sna_damage.c
+++ b/src/sna/sna_damage.c
@@ -970,7 +970,7 @@ static bool box_contains(const BoxRec *a, const BoxRec *b)
 	return true;
 }
 
-static inline Bool sna_damage_maybe_contains_box(struct sna_damage *damage,
+static inline Bool sna_damage_maybe_contains_box(const struct sna_damage *damage,
 						 const BoxRec *box)
 {
 	if (box->x2 <= damage->extents.x1 ||
@@ -1190,6 +1190,21 @@ int sna_damage_contains_box(struct sna_damage *damage,
 }
 #endif
 
+bool sna_damage_contains_box__no_reduce(const struct sna_damage *damage,
+					const BoxRec *box)
+{
+	int ret;
+
+	assert(damage && damage->mode != DAMAGE_ALL);
+	if (!sna_damage_maybe_contains_box(damage, box))
+		return false;
+
+	ret = pixman_region_contains_rectangle((RegionPtr)&damage->region,
+					       (BoxPtr)box);
+	return (!damage->dirty || damage->mode == DAMAGE_ADD) &&
+		ret == PIXMAN_REGION_IN;
+}
+
 static Bool _sna_damage_intersect(struct sna_damage *damage,
 				  RegionPtr region, RegionPtr result)
 {