sna: Spawn threads to rasterize trapezoids through pixman

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

1 files changed, 6 insertions, 7 deletions

diff --git a/src/sna/sna_threads.c b/src/sna/sna_threads.c
index 3cda969c..4a98753f 100644
--- a/src/sna/sna_threads.c
+++ b/src/sna/sna_threads.c
@@ -275,7 +275,7 @@ void sna_image_composite(pixman_op_t        op,
 		data[0].width = width;
 		data[0].height = dy;
 
-		for (n = 0; n < num_threads - 1; n++) {
+		for (n = 1; n < num_threads; n++) {
 			data[n] = data[0];
 			data[n].src_y += y - dst_y;
 			data[n].mask_y += y - dst_y;
@@ -288,13 +288,12 @@ void sna_image_composite(pixman_op_t        op,
 		if (y + dy > dst_y + height)
 			dy = dst_y + height - y;
 
-		data[n] = data[0];
-		data[n].src_y += y - dst_y;
-		data[n].mask_y += y - dst_y;
-		data[n].dst_y = y;
-		data[n].height = dy;
+		data[0].src_y += y - dst_y;
+		data[0].mask_y += y - dst_y;
+		data[0].dst_y = y;
+		data[0].height = dy;
 
-		thread_composite(&data[n]);
+		thread_composite(&data[0]);
 
 		sna_threads_wait();
 	}