sna: Handle GetImage planemask inplace

As found by Adam Jackson, we can perform the masking of the planemask on
the user buffer and so avoid hitting the fallback paths, so long as we
have no 24bpp Pixmaps.

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

1 files changed, 12 insertions, 3 deletions

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index 30252982..9fe09fff 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -17191,8 +17191,7 @@ sna_get_image(DrawablePtr drawable,
 	if (ACCEL_GET_IMAGE &&
 	    !FORCE_FALLBACK &&
 	    format == ZPixmap &&
-	    drawable->bitsPerPixel >= 8 &&
-	    PM_IS_SOLID(drawable, mask)) {
+	    drawable->bitsPerPixel >= 8) {
 		PixmapPtr pixmap = get_drawable_pixmap(drawable);
 		int16_t dx, dy;
 
@@ -17204,7 +17203,7 @@ sna_get_image(DrawablePtr drawable,
 		region.data = NULL;
 
 		if (sna_get_image__fast(pixmap, &region, dst, flags))
-			return;
+			goto apply_planemask;
 
 		if (!sna_drawable_move_region_to_cpu(&pixmap->drawable,
 						     &region, flags))
@@ -17222,6 +17221,16 @@ sna_get_image(DrawablePtr drawable,
 				   region.extents.x1, region.extents.y1, 0, 0, w, h);
 			sigtrap_put();
 		}
+
+apply_planemask:
+		if (!PM_IS_SOLID(drawable, mask)) {
+			FbStip pm = fbReplicatePixel(mask, drawable->bitsPerPixel);
+			FbStip *d = (FbStip *)dst;
+			int i, n = PixmapBytePad(w, drawable->depth) / sizeof(FbStip) * h;
+
+			for (i = 0; i < n; i++)
+				d[i] &= pm;
+		}
 	} else {
 		region.extents.x1 = x + drawable->x;
 		region.extents.y1 = y + drawable->y;