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-rw-r--r--qemu/ui/vnc.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/qemu/ui/vnc.c b/qemu/ui/vnc.c
index e26973a2b..caf82f56f 100644
--- a/qemu/ui/vnc.c
+++ b/qemu/ui/vnc.c
@@ -2872,7 +2872,7 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
pixman_image_get_width(vd->server));
int height = MIN(pixman_image_get_height(vd->guest.fb),
pixman_image_get_height(vd->server));
- int cmp_bytes, server_stride, min_stride, guest_stride, y = 0;
+ int cmp_bytes, server_stride, line_bytes, guest_ll, guest_stride, y = 0;
uint8_t *guest_row0 = NULL, *server_row0;
VncState *vs;
int has_dirty = 0;
@@ -2891,17 +2891,21 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
* Update server dirty map.
*/
server_row0 = (uint8_t *)pixman_image_get_data(vd->server);
- server_stride = guest_stride = pixman_image_get_stride(vd->server);
+ server_stride = guest_stride = guest_ll =
+ pixman_image_get_stride(vd->server);
cmp_bytes = MIN(VNC_DIRTY_PIXELS_PER_BIT * VNC_SERVER_FB_BYTES,
server_stride);
if (vd->guest.format != VNC_SERVER_FB_FORMAT) {
int width = pixman_image_get_width(vd->server);
tmpbuf = qemu_pixman_linebuf_create(VNC_SERVER_FB_FORMAT, width);
} else {
+ int guest_bpp =
+ PIXMAN_FORMAT_BPP(pixman_image_get_format(vd->guest.fb));
guest_row0 = (uint8_t *)pixman_image_get_data(vd->guest.fb);
guest_stride = pixman_image_get_stride(vd->guest.fb);
+ guest_ll = pixman_image_get_width(vd->guest.fb) * ((guest_bpp + 7) / 8);
}
- min_stride = MIN(server_stride, guest_stride);
+ line_bytes = MIN(server_stride, guest_ll);
for (;;) {
int x;
@@ -2932,9 +2936,10 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
if (!test_and_clear_bit(x, vd->guest.dirty[y])) {
continue;
}
- if ((x + 1) * cmp_bytes > min_stride) {
- _cmp_bytes = min_stride - x * cmp_bytes;
+ if ((x + 1) * cmp_bytes > line_bytes) {
+ _cmp_bytes = line_bytes - x * cmp_bytes;
}
+ assert(_cmp_bytes >= 0);
if (memcmp(server_ptr, guest_ptr, _cmp_bytes) == 0) {
continue;
}