static void vnc_dpy_update(DisplayChangeListener *dcl, int x, int y, int w, int h) { VncDisplay *vd = container_of(dcl, VncDisplay, dcl); struct VncSurface *s = &vd->guest; int width = surface_width(vd->ds); int height = surface_height(vd->ds); /* this is needed this to ensure we updated all affected * blocks if x % VNC_DIRTY_PIXELS_PER_BIT != 0 */ w += (x % VNC_DIRTY_PIXELS_PER_BIT); x -= (x % VNC_DIRTY_PIXELS_PER_BIT); x = MIN(x, width); y = MIN(y, height); w = MIN(x + w, width) - x; h = MIN(y + h, height); for (; y < h; y++) { bitmap_set(s->dirty[y], x / VNC_DIRTY_PIXELS_PER_BIT, DIV_ROUND_UP(w, VNC_DIRTY_PIXELS_PER_BIT)); } }