randr: introduce rrCrtcGetInfo DDX function

This allows rrCrtcGetInfo to override the values in the XRRCrtcGetInfo
reply. One use case is to allow Xwayland to return the current emulated
mode for the specific client instead of the global mode.

Signed-off-by: Minh Phan <phanquangminh217@gmail.com>
Acked-by: Olivier Fourdan <ofourdan@redhat.com>
(cherry picked from commit 5145742fb6e3d108b05db1521b51112e0dbfb95a)

2 files changed, 11 insertions, 0 deletions

diff --git a/randr/randrstr.h b/randr/randrstr.h
index 173ecdf4e..545348835 100644
--- a/randr/randrstr.h
+++ b/randr/randrstr.h
@@ -218,6 +218,10 @@ typedef Bool (*RRCrtcSetProcPtr) (ScreenPtr pScreen,
                                   Rotation rotation,
                                   int numOutputs, RROutputPtr * outputs);
 
+typedef void (*RRCrtcGetProcPtr) (ScreenPtr pScreen,
+                                  RRCrtcPtr crtc,
+                                  xRRGetCrtcInfoReply *rep);
+
 typedef Bool (*RRCrtcSetGammaProcPtr) (ScreenPtr pScreen, RRCrtcPtr crtc);
 
 typedef Bool (*RRCrtcGetGammaProcPtr) (ScreenPtr pScreen, RRCrtcPtr crtc);
@@ -420,6 +424,10 @@ typedef struct _rrScrPriv {
 
     RRRequestLeaseProcPtr rrRequestLease;
     RRGetLeaseProcPtr rrGetLease;
+
+#if RANDR_12_INTERFACE
+    RRCrtcGetProcPtr rrCrtcGet;
+#endif
 } rrScrPrivRec, *rrScrPrivPtr;
 
 extern _X_EXPORT DevPrivateKeyRec rrPrivKeyRec;
diff --git a/randr/rrcrtc.c b/randr/rrcrtc.c
index e64f03131..5f85bdfa5 100644
--- a/randr/rrcrtc.c
+++ b/randr/rrcrtc.c
@@ -1269,6 +1269,9 @@ ProcRRGetCrtcInfo(ClientPtr client)
         }
     }
 
+    if (pScrPriv->rrCrtcGet)
+        pScrPriv->rrCrtcGet(pScreen, crtc, &rep);
+
     if (client->swapped) {
         swaps(&rep.sequenceNumber);
         swapl(&rep.length);