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spice: send updates only for changed screen content
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>
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@ -239,6 +239,13 @@ static void qemu_spice_create_one_update(SimpleSpiceDisplay *ssd,
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static void qemu_spice_create_update(SimpleSpiceDisplay *ssd)
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{
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static const int blksize = 32;
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int blocks = (ds_get_width(ssd->ds) + blksize - 1) / blksize;
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int dirty_top[blocks];
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int y, yoff, x, xoff, blk, bw;
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int bpp = ds_get_bytes_per_pixel(ssd->ds);
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uint8_t *guest, *mirror;
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if (qemu_spice_rect_is_empty(&ssd->dirty)) {
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return;
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};
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@ -253,7 +260,54 @@ static void qemu_spice_create_update(SimpleSpiceDisplay *ssd)
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ssd->ds_mirror = g_malloc0(size);
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}
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qemu_spice_create_one_update(ssd, &ssd->dirty);
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for (blk = 0; blk < blocks; blk++) {
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dirty_top[blk] = -1;
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}
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guest = ds_get_data(ssd->ds);
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mirror = ssd->ds_mirror;
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for (y = ssd->dirty.top; y < ssd->dirty.bottom; y++) {
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yoff = y * ds_get_linesize(ssd->ds);
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for (x = ssd->dirty.left; x < ssd->dirty.right; x += blksize) {
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xoff = x * bpp;
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blk = x / blksize;
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bw = MIN(blksize, ssd->dirty.right - x);
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if (memcmp(guest + yoff + xoff,
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mirror + yoff + xoff,
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bw * bpp) == 0) {
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if (dirty_top[blk] != -1) {
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QXLRect update = {
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.top = dirty_top[blk],
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.bottom = y,
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.left = x,
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.right = x + bw,
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};
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qemu_spice_create_one_update(ssd, &update);
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dirty_top[blk] = -1;
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}
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} else {
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if (dirty_top[blk] == -1) {
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dirty_top[blk] = y;
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}
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}
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}
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}
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for (x = ssd->dirty.left; x < ssd->dirty.right; x += blksize) {
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blk = x / blksize;
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bw = MIN(blksize, ssd->dirty.right - x);
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if (dirty_top[blk] != -1) {
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QXLRect update = {
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.top = dirty_top[blk],
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.bottom = ssd->dirty.bottom,
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.left = x,
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.right = x + bw,
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};
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qemu_spice_create_one_update(ssd, &update);
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dirty_top[blk] = -1;
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}
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}
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memset(&ssd->dirty, 0, sizeof(ssd->dirty));
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}
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