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ui/vnc: optimize setting in vnc_dpy_update()

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Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Peter Lieven 2014-01-08 10:08:37 +01:00 committed by Gerd Hoffmann
parent 863d7c9105
commit 919372251c
1 changed files with 5 additions and 11 deletions
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16
ui/vnc.c
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@ -430,30 +430,24 @@ static int vnc_refresh_server_surface(VncDisplay *vd);
static void vnc_dpy_update(DisplayChangeListener *dcl,
int x, int y, int w, int h)
{
int i;
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
struct VncSurface *s = &vd->guest;
int width = surface_width(vd->ds);
int height = surface_height(vd->ds);
h += y;
/* round x down to ensure the loop only spans one 16-pixel block per,
iteration. otherwise, if (x % 16) != 0, the last iteration may span
two 16-pixel blocks but we only mark the first as dirty
*/
/* this is needed this to ensure we updated all affected
* blocks if x % VNC_DIRTY_PIXELS_PER_BIT != 0 */
w += (x % VNC_DIRTY_PIXELS_PER_BIT);
x -= (x % VNC_DIRTY_PIXELS_PER_BIT);
x = MIN(x, width);
y = MIN(y, height);
w = MIN(x + w, width) - x;
h = MIN(h, height);
h = MIN(y + h, height);
for (; y < h; y++) {
for (i = 0; i < w; i += VNC_DIRTY_PIXELS_PER_BIT) {
set_bit((x + i) / VNC_DIRTY_PIXELS_PER_BIT, s->dirty[y]);
}
bitmap_set(s->dirty[y], x / VNC_DIRTY_PIXELS_PER_BIT,
DIV_ROUND_UP(w, VNC_DIRTY_PIXELS_PER_BIT));
}
}