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x: Handle expose-events by only copying the requested region from our pixmap 

This is faster than always updating the whole pixmap and should be safe.
This commit is contained in:
Michael Stapelberg 2011-12-17 20:08:56 +00:00
parent 6f8b284586
commit 0d210277f0
1 changed files with 7 additions and 7 deletions
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14
src/handlers.c
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@ -648,11 +648,6 @@ static int handle_windowclass_change(void *data, xcb_connection_t *conn, uint8_t
static int handle_expose_event(xcb_expose_event_t *event) {
Con *parent;
/* event->count is the number of minimum remaining expose events for this
* window, so we skip all events but the last one */
if (event->count != 0)
return 1;
DLOG("window = %08x\n", event->window);
if ((parent = con_by_frame_id(event->window)) == NULL) {
@ -660,8 +655,13 @@ static int handle_expose_event(xcb_expose_event_t *event) {
return 1;
}
/* re-render the parent (recursively, if it’s a split con) */
x_deco_recurse(parent);
/* Since we render to our pixmap on every change anyways, expose events
* only tell us that the X server lost (parts of) the window contents. We
* can handle that by copying the appropriate part from our pixmap to the
* window. */
xcb_copy_area(conn, parent->pixmap, parent->frame, parent->pm_gc,
event->x, event->y, event->x, event->y,
event->width, event->height);
xcb_flush(conn);
return 1;