[RFC xserver v3 13/14] present: Send a PresentWindowCrtcNotify event appropriately

[Louis-Francis Ratté-Boulianne]

When the window has changed CRTC, send the event.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb at collabora.com>
---
 present/present.c       |  5 +++++
 present/present_event.c | 35 +++++++++++++++++++++++++++++++++++
 present/present_priv.h  |  3 +++
 3 files changed, 43 insertions(+)

diff --git a/present/present.c b/present/present.c
index aa9c041df..c47b28b20 100644
--- a/present/present.c
+++ b/present/present.c
@@ -815,6 +815,11 @@ present_pixmap(WindowPtr window,
 
     ret = present_get_ust_msc(screen, target_crtc, &ust, &crtc_msc);
 
+    /* Notify the client that the window is no longer on the same target CRTC
+     */
+    if (target_crtc != window_priv->crtc)
+        present_send_window_crtc_notify(window, serial, target_crtc);
+
     target_msc = present_window_to_crtc_msc(window, target_crtc, window_msc, crtc_msc);
 
     if (ret == Success) {
diff --git a/present/present_event.c b/present/present_event.c
index c222dd5ff..ac6edd9de 100644
--- a/present/present_event.c
+++ b/present/present_event.c
@@ -100,6 +100,14 @@ present_event_swap(xGenericEvent *from, xGenericEvent *to)
         swapl(&c->serial);
         swapl(&c->idle_fence);
     }
+    case PresentWindowCrtcNotify:
+    {
+        xPresentWindowCrtcNotify *c = (xPresentWindowCrtcNotify *) to;
+        swapl(&c->eid);
+        swapl(&c->window);
+        swapl(&c->serial);
+        swapl(&c->crtc);
+    }
     }
 }
 
@@ -205,6 +213,33 @@ present_send_idle_notify(WindowPtr window, CARD32 serial, PixmapPtr pixmap, stru
     }
 }
 
+void
+present_send_window_crtc_notify(WindowPtr window, CARD32 serial, RRCrtcPtr crtc)
+{
+    present_window_priv_ptr window_priv = present_window_priv(window);
+
+    if (window_priv) {
+        xPresentWindowCrtcNotify in = {
+            .type = GenericEvent,
+            .extension = present_request,
+            .length = (sizeof(xPresentWindowCrtcNotify) - 32) >> 2,
+            .evtype = PresentWindowCrtcNotify,
+            .eid = 0,
+            .window = window->drawable.id,
+            .serial = serial,
+            .crtc = crtc ? crtc->id : 0
+        };
+        present_event_ptr event;
+
+        for (event = window_priv->events; event; event = event->next) {
+            if (event->mask & PresentWindowCrtcNotifyMask) {
+                in.eid = event->id;
+                WriteEventsToClient(event->client, 1, (xEvent *) &in);
+            }
+        }
+    }
+}
+
 int
 present_select_input(ClientPtr client, XID eid, WindowPtr window, CARD32 mask)
 {
diff --git a/present/present_priv.h b/present/present_priv.h
index dfb4bdea9..408cc7a86 100644
--- a/present/present_priv.h
+++ b/present/present_priv.h
@@ -220,6 +220,9 @@ present_send_complete_notify(WindowPtr window, CARD8 kind, CARD8 mode, CARD32 se
 void
 present_send_idle_notify(WindowPtr window, CARD32 serial, PixmapPtr pixmap, present_fence_ptr idle_fence);
 
+void
+present_send_window_crtc_notify(WindowPtr window, CARD32 serial, RRCrtcPtr crtc);
+
 int
 present_select_input(ClientPtr client,
                      CARD32 eid,
-- 
2.13.0