sna/gen3: Improve clear-to-solid reduction

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

1 files changed, 24 insertions, 0 deletions

diff --git a/src/sna/gen3_render.c b/src/sna/gen3_render.c
index 8c88722d..b2367611 100644
--- a/src/sna/gen3_render.c
+++ b/src/sna/gen3_render.c
@@ -2258,6 +2258,27 @@ gen3_init_radial(struct sna *sna,
 }
 
 static Bool
+sna_picture_is_clear(PicturePtr picture,
+		     int x, int y, int w, int h,
+		     uint32_t *color)
+{
+	struct sna_pixmap *priv;
+
+	if (!picture->pDrawable)
+		return FALSE;
+
+	priv = sna_pixmap(get_drawable_pixmap(picture->pDrawable));
+	if (priv == NULL || !priv->clear)
+		return FALSE;
+
+	if (!source_is_covered(picture, x, y, w, h))
+		return FALSE;
+
+	*color = priv->clear_color;
+	return TRUE;
+}
+
+static Bool
 gen3_composite_picture(struct sna *sna,
 		       PicturePtr picture,
 		       struct sna_composite_op *op,
@@ -2310,6 +2331,9 @@ gen3_composite_picture(struct sna *sna,
 	if (sna_picture_is_solid(picture, &color))
 		return gen3_init_solid(channel, color);
 
+	if (sna_picture_is_clear(picture, x, y, w, h, &color))
+		return gen3_init_solid(channel, color);
+
 	if (!gen3_check_repeat(picture))
 		return sna_render_picture_fixup(sna, picture, channel,
 						x, y, w, h, dst_x, dst_y);