[Qemu-devel] [PATCH] spice: surface switch fast path requires same format too.

[Gerd Hoffmann <kraxel@redhat.com>]

Commit "555e72f spice: rework mirror allocation, add no-resize fast path"
adds a fast path for surface switches which does't go through the full
primary surface destroy and re-recreation in case the new surface is
identical to the old one (page-flip).  It checks the size only though,
but the format must be identical too.  This patch adds the format check.

Commit "0002a51 ui/spice: Support shared surface for most pixman
formats" increases the cance to actually trigger this.

https://bugzilla.redhat.com/show_bug.cgi?id=1247479

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/spice-display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ui/spice-display.c b/ui/spice-display.c
index 77c8cba..0489131 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -408,7 +408,8 @@ void qemu_spice_display_switch(SimpleSpiceDisplay *ssd,
 
     if (surface && ssd->surface &&
         surface_width(surface) == pixman_image_get_width(ssd->surface) &&
-        surface_height(surface) == pixman_image_get_height(ssd->surface)) {
+        surface_height(surface) == pixman_image_get_height(ssd->surface) &&
+        surface_format(surface) == pixman_image_get_format(ssd->surface)) {
         /* no-resize fast path: just swap backing store */
         dprint(1, "%s/%d: fast (%dx%d)\n", __func__, ssd->qxl.id,
                surface_width(surface), surface_height(surface));
-- 
1.8.3.1