aboutsummaryrefslogtreecommitdiff
path: root/ui
diff options
context:
space:
mode:
authorWen, Jianxian <Jianxian.Wen@verisilicon.com>2022-03-15 06:50:37 +0000
committerGerd Hoffmann <kraxel@redhat.com>2022-03-18 09:30:01 +0100
commit6c08964b415a7bfd3b3ed65e7309cc3ffdb096b8 (patch)
tree30061ddfa61f1cc605d784b9b9537cffaf571d49 /ui
parent2297db8228cc0ee601a21b3e3f443ab6879f2a06 (diff)
downloadqemu-6c08964b415a7bfd3b3ed65e7309cc3ffdb096b8.zip
qemu-6c08964b415a7bfd3b3ed65e7309cc3ffdb096b8.tar.gz
qemu-6c08964b415a7bfd3b3ed65e7309cc3ffdb096b8.tar.bz2
ui: avoid unnecessary memory operations in vnc_refresh_server_surface()
Check the dirty bits in advance to avoid unnecessary memory operations. In the case that guest surface has different format than the server, but it does not have dirty bits which means no refresh is actually needed, the memory operations is not necessary. Signed-off-by: Jianxian Wen <jianxian.wen@verisilicon.com> Signed-off-by: Lu Gao <lu.gao@verisilicon.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <4C23C17B8E87E74E906A25A3254A03F4FA22100C@SHASXM06.verisilicon.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'ui')
-rw-r--r--ui/vnc.c26
1 files changed, 17 insertions, 9 deletions
diff --git a/ui/vnc.c b/ui/vnc.c
index 3ccd33d..310a873 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -3098,6 +3098,9 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
VncState *vs;
int has_dirty = 0;
pixman_image_t *tmpbuf = NULL;
+ unsigned long offset;
+ int x;
+ uint8_t *guest_ptr, *server_ptr;
struct timeval tv = { 0, 0 };
@@ -3106,6 +3109,13 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
has_dirty = vnc_update_stats(vd, &tv);
}
+ offset = find_next_bit((unsigned long *) &vd->guest.dirty,
+ height * VNC_DIRTY_BPL(&vd->guest), 0);
+ if (offset == height * VNC_DIRTY_BPL(&vd->guest)) {
+ /* no dirty bits in guest surface */
+ return has_dirty;
+ }
+
/*
* Walk through the guest dirty map.
* Check and copy modified bits from guest to server surface.
@@ -3130,15 +3140,6 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
line_bytes = MIN(server_stride, guest_ll);
for (;;) {
- int x;
- uint8_t *guest_ptr, *server_ptr;
- unsigned long offset = find_next_bit((unsigned long *) &vd->guest.dirty,
- height * VNC_DIRTY_BPL(&vd->guest),
- y * VNC_DIRTY_BPL(&vd->guest));
- if (offset == height * VNC_DIRTY_BPL(&vd->guest)) {
- /* no more dirty bits */
- break;
- }
y = offset / VNC_DIRTY_BPL(&vd->guest);
x = offset % VNC_DIRTY_BPL(&vd->guest);
@@ -3177,6 +3178,13 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
}
y++;
+ offset = find_next_bit((unsigned long *) &vd->guest.dirty,
+ height * VNC_DIRTY_BPL(&vd->guest),
+ y * VNC_DIRTY_BPL(&vd->guest));
+ if (offset == height * VNC_DIRTY_BPL(&vd->guest)) {
+ /* no more dirty bits */
+ break;
+ }
}
qemu_pixman_image_unref(tmpbuf);
return has_dirty;