optimize screendump for the common non-switch case

switch console only if needed, also pass down whenever the console was
switched or not because a displaysurface redraw is only needed in case
the console was switched.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/hw/blizzard.c b/hw/blizzard.c
index b2c1b22844..c7d844d105 100644
--- a/hw/blizzard.c
+++ b/hw/blizzard.c
@@ -932,10 +932,14 @@ static void blizzard_update_display(void *opaque)
     s->my[1] = 0;
 }
 
-static void blizzard_screen_dump(void *opaque, const char *filename) {
+static void blizzard_screen_dump(void *opaque, const char *filename,
+                                 bool cswitch)
+{
     BlizzardState *s = (BlizzardState *) opaque;
 
-    blizzard_update_display(opaque);
+    if (cswitch) {
+        blizzard_update_display(opaque);
+    }
     if (s && ds_get_data(s->state))
         ppm_save(filename, s->state->surface);
 }