@@ -239,6 +239,13 @@ static void qemu_spice_create_one_update(SimpleSpiceDisplay *ssd,
static void qemu_spice_create_update(SimpleSpiceDisplay *ssd)
{
+ static const int blksize = 32;
+ int blocks = (ds_get_width(ssd->ds) + blksize - 1) / blksize;
+ int dirty_top[blocks];
+ int y, yoff, x, xoff, blk, bw;
+ int bpp = ds_get_bytes_per_pixel(ssd->ds);
+ uint8_t *guest, *mirror;
+
if (qemu_spice_rect_is_empty(&ssd->dirty)) {
return;
};
@@ -253,7 +260,54 @@ static void qemu_spice_create_update(SimpleSpiceDisplay *ssd)
ssd->ds_mirror = g_malloc0(size);
}
- qemu_spice_create_one_update(ssd, &ssd->dirty);
+ for (blk = 0; blk < blocks; blk++) {
+ dirty_top[blk] = -1;
+ }
+
+ guest = ds_get_data(ssd->ds);
+ mirror = ssd->ds_mirror;
+ for (y = ssd->dirty.top; y < ssd->dirty.bottom; y++) {
+ yoff = y * ds_get_linesize(ssd->ds);
+ for (x = ssd->dirty.left; x < ssd->dirty.right; x += blksize) {
+ xoff = x * bpp;
+ blk = x / blksize;
+ bw = MIN(blksize, ssd->dirty.right - x);
+ if (memcmp(guest + yoff + xoff,
+ mirror + yoff + xoff,
+ bw * bpp) == 0) {
+ if (dirty_top[blk] != -1) {
+ QXLRect update = {
+ .top = dirty_top[blk],
+ .bottom = y,
+ .left = x,
+ .right = x + bw,
+ };
+ qemu_spice_create_one_update(ssd, &update);
+ dirty_top[blk] = -1;
+ }
+ } else {
+ if (dirty_top[blk] == -1) {
+ dirty_top[blk] = y;
+ }
+ }
+ }
+ }
+
+ for (x = ssd->dirty.left; x < ssd->dirty.right; x += blksize) {
+ blk = x / blksize;
+ bw = MIN(blksize, ssd->dirty.right - x);
+ if (dirty_top[blk] != -1) {
+ QXLRect update = {
+ .top = dirty_top[blk],
+ .bottom = ssd->dirty.bottom,
+ .left = x,
+ .right = x + bw,
+ };
+ qemu_spice_create_one_update(ssd, &update);
+ dirty_top[blk] = -1;
+ }
+ }
+
memset(&ssd->dirty, 0, sizeof(ssd->dirty));
}
when creating screen updates go compare the current guest screen against the mirror (which holds the most recent update sent), then only create updates for the screen areas which did actually change. [ v2: drop redundant qemu_spice_create_one_update call ] Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> --- ui/spice-display.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 55 insertions(+), 1 deletions(-)