randr: send RRResourceChangeNotify event (abi unbreak)

Send RRResourceChangeNotify event when provider, output or crtc was created or
destroyed. I.e. when the list of resources returned by RRGetScreenResources and
RRGetProviders changes.

[airlied: move structure member to avoid ABI breakage]

Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Michal Srb <msrb@suse.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit a9ca93dcf9)

hw/xfree86/common/xf86platformBus.c

@@ -466,6 +466,9 @@ xf86platformAddDevice(int index)
    /* attach unbound to 0 protocol screen */
    AttachUnboundGPU(xf86Screens[0]->pScreen, xf86GPUScreens[i]->pScreen);
 
+   RRResourcesChanged(xf86Screens[0]->pScreen);
+   RRTellChanged(xf86Screens[0]->pScreen);
+
    return 0;
 }
 
@@ -508,6 +511,8 @@ xf86platformRemoveDevice(int index)
     xf86UnclaimPlatformSlot(&xf86_platform_devices[index], NULL);
 
     xf86_remove_platform_device(index);
+
+    RRResourcesChanged(xf86Screens[0]->pScreen);
     RRTellChanged(xf86Screens[0]->pScreen);
  out:
     return;

randr/randr.c

@@ -420,6 +420,32 @@ RRExtensionInit(void)
 #endif
 }
 
+void
+RRResourcesChanged(ScreenPtr pScreen)
+{
+    rrScrPriv(pScreen);
+    pScrPriv->resourcesChanged = TRUE;
+
+    RRSetChanged(pScreen);
+}
+
+static void
+RRDeliverResourceEvent(ClientPtr client, WindowPtr pWin)
+{
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+
+    rrScrPriv(pScreen);
+
+    xRRResourceChangeNotifyEvent re = {
+        .type = RRNotify + RREventBase,
+        .subCode = RRNotify_ResourceChange,
+        .timestamp = pScrPriv->lastSetTime.milliseconds,
+        .window = pWin->drawable.id
+    };
+
+    WriteEventsToClient(client, 1, (xEvent *) &re);
+}
+
 static int
 TellChanged(WindowPtr pWin, pointer value)
 {
@@ -480,6 +506,12 @@ TellChanged(WindowPtr pWin, pointer value)
                     RRDeliverProviderEvent(client, pWin, pSlaveScrPriv->provider);
             }
         }
+
+        if (pRREvent->mask & RRResourceChangeNotifyMask) {
+            if (pScrPriv->resourcesChanged) {
+                RRDeliverResourceEvent(client, pWin);
+            }
+        }
     }
     return WT_WALKCHILDREN;
 }
@@ -536,7 +568,11 @@ RRTellChanged(ScreenPtr pScreen)
         }
         pScrPriv->changed = FALSE;
         mastersp->changed = FALSE;
+
         WalkTree(master, TellChanged, (pointer) master);
+
+        mastersp->resourcesChanged = FALSE;
+
         for (i = 0; i < pScrPriv->numOutputs; i++)
             pScrPriv->outputs[i]->changed = FALSE;
         for (i = 0; i < pScrPriv->numCrtcs; i++)

randr/randrstr.h

@@ -337,6 +337,7 @@ typedef struct _rrScrPriv {
 
     RRProviderDestroyProcPtr rrProviderDestroy;
 
+    Bool resourcesChanged;      /* screen resources change */
 } rrScrPrivRec, *rrScrPrivPtr;
 
 extern _X_EXPORT DevPrivateKeyRec rrPrivKeyRec;
@@ -486,6 +487,9 @@ extern _X_EXPORT int
 extern _X_EXPORT void
  RRDeliverScreenEvent(ClientPtr client, WindowPtr pWin, ScreenPtr pScreen);
 
+extern _X_EXPORT void
+ RRResourcesChanged(ScreenPtr pScreen);
+
 /* randr.c */
 /* set a screen change on the primary screen */
 extern _X_EXPORT void

randr/rrcrtc.c

@@ -102,6 +102,8 @@ RRCrtcCreate(ScreenPtr pScreen, void *devPrivate)
     crtc->pScreen = pScreen;
     pScrPriv->crtcs[pScrPriv->numCrtcs++] = crtc;
 
+    RRResourcesChanged(pScreen);
+
     return crtc;
 }
 
@@ -672,6 +674,8 @@ RRCrtcDestroyResource(pointer value, XID pid)
                 break;
             }
         }
+
+        RRResourcesChanged(pScreen);
     }
 
     if (crtc->scanout_pixmap)

randr/rroutput.c

@@ -101,6 +101,9 @@ RROutputCreate(ScreenPtr pScreen,
         return NULL;
 
     pScrPriv->outputs[pScrPriv->numOutputs++] = output;
+
+    RRResourcesChanged(pScreen);
+
     return output;
 }
 
@@ -355,6 +358,8 @@ RROutputDestroyResource(pointer value, XID pid)
                 break;
             }
         }
+
+        RRResourcesChanged(pScreen);
     }
     if (output->modes) {
         for (m = 0; m < output->numModes; m++)