Blame SOURCES/kvm-ui-vnc-optimize-setting-in-vnc_dpy_update.patch

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From 9730b328cc524281334344466a01fb861b271b82 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Wed, 22 Feb 2017 12:36:22 +0100
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Subject: [PATCH 04/24] ui/vnc: optimize setting in vnc_dpy_update()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1487766986-6329-5-git-send-email-kraxel@redhat.com>
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Patchwork-id: 73974
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O-Subject: [RHEL-7.4 qemu-kvm PATCH 4/8] ui/vnc: optimize setting in vnc_dpy_update()
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Bugzilla: 1377977
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Marc-André Lureau <mlureau@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 919372251cbfa9e43b0264fec475dd1eca23784f)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 ui/vnc.c | 16 +++++-----------
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 1 file changed, 5 insertions(+), 11 deletions(-)
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diff --git a/ui/vnc.c b/ui/vnc.c
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index 54530a2..2540261 100644
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--- a/ui/vnc.c
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+++ b/ui/vnc.c
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@@ -430,30 +430,24 @@ static int vnc_refresh_server_surface(VncDisplay *vd);
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 static void vnc_dpy_update(DisplayChangeListener *dcl,
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                            int x, int y, int w, int h)
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 {
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-    int i;
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     VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
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     struct VncSurface *s = &vd->guest;
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     int width = surface_width(vd->ds);
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     int height = surface_height(vd->ds);
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-    h += y;
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-
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-    /* round x down to ensure the loop only spans one 16-pixel block per,
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-       iteration.  otherwise, if (x % 16) != 0, the last iteration may span
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-       two 16-pixel blocks but we only mark the first as dirty
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-    */
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+    /* this is needed this to ensure we updated all affected
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+     * blocks if x % VNC_DIRTY_PIXELS_PER_BIT != 0 */
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     w += (x % VNC_DIRTY_PIXELS_PER_BIT);
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     x -= (x % VNC_DIRTY_PIXELS_PER_BIT);
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     x = MIN(x, width);
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     y = MIN(y, height);
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     w = MIN(x + w, width) - x;
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-    h = MIN(h, height);
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+    h = MIN(y + h, height);
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     for (; y < h; y++) {
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-        for (i = 0; i < w; i += VNC_DIRTY_PIXELS_PER_BIT) {
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-            set_bit((x + i) / VNC_DIRTY_PIXELS_PER_BIT, s->dirty[y]);
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-        }
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+        bitmap_set(s->dirty[y], x / VNC_DIRTY_PIXELS_PER_BIT,
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+                   DIV_ROUND_UP(w, VNC_DIRTY_PIXELS_PER_BIT));
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     }
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 }
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-- 
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1.8.3.1
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