[Spice-devel] [Common patch 1/2] canvas_utils: Make sure strides are aligned to multiple of 4

[Søren Sandmann]

From: Søren Sandmann Pedersen <ssp at redhat.com>

Pixman requires all strides to be aligned to a multiple of 4. With the
upcoming a8 images, this is not guaranteed anymore.
---
 common/canvas_utils.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/common/canvas_utils.c b/common/canvas_utils.c
index 7b92436..feb89cb 100644
--- a/common/canvas_utils.c
+++ b/common/canvas_utils.c
@@ -282,6 +282,9 @@ pixman_image_t *alloc_lz_image_surface(LzDecodeUsrData *canvas_data,
 
     stride = (gross_pixels / height) * (PIXMAN_FORMAT_BPP (pixman_format) / 8);
 
+    /* pixman requires strides to be 4-byte aligned */
+    stride = SPICE_ALIGN(stride, 4);
+    
     if (!top_down) {
         stride = -stride;
     }
-- 
1.7.4