From e503ba260e585c9ee56f44ae5b8da51643776369 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Wed, 5 Sep 2012 10:41:42 +0200 Subject: [PATCH 218/293] 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 --- ui/spice-display.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 55 insertions(+), 1 deletion(-) diff --git a/ui/spice-display.c b/ui/spice-display.c index 973cd53..d062765 100644 --- a/ui/spice-display.c +++ b/ui/spice-display.c @@ -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)); } -- 1.7.12