DRI: New ClipNotify driver hook.

The hook is called whenever the clipList of any DRI window changes, be it via
DRIClipNotify, DRICreateDrawable or DRIDrawablePrivDelete. This allows the
driver to keep track of which DRI windows are visible where.

hw/xfree86/dri/dri.c

@@ -1007,6 +1007,55 @@ DRITransitionTo2d(ScreenPtr pScreen)
 }
 
 
+static int
+DRIDCNTreeTraversal(WindowPtr pWin, pointer data)
+{
+    DRIDrawablePrivPtr pDRIDrawablePriv = DRI_DRAWABLE_PRIV_FROM_WINDOW(pWin);
+
+    if (pDRIDrawablePriv) {
+	ScreenPtr pScreen = pWin->drawable.pScreen;
+	DRIScreenPrivPtr pDRIPriv = DRI_SCREEN_PRIV(pScreen);
+
+	if (REGION_NUM_RECTS(&pWin->clipList) > 0) {
+	    WindowPtr *pDRIWindows = (WindowPtr*)data;
+	    int i = 0;
+
+	    while (pDRIWindows[i])
+		i++;
+
+	    pDRIWindows[i] = pWin;
+
+	    pDRIPriv->nrWalked++;
+	}
+
+	if (pDRIPriv->nrWindows == pDRIPriv->nrWalked)
+	    return WT_STOPWALKING;
+    }
+
+    return WT_WALKCHILDREN;
+}
+
+static void
+DRIDriverClipNotify(ScreenPtr pScreen)
+{
+    DRIScreenPrivPtr pDRIPriv = DRI_SCREEN_PRIV(pScreen);
+
+    if (pDRIPriv->pDriverInfo->ClipNotify) {
+	WindowPtr *pDRIWindows = xcalloc(sizeof(WindowPtr), pDRIPriv->nrWindows);
+	DRIInfoPtr pDRIInfo = pDRIPriv->pDriverInfo;
+
+	if (pDRIPriv->nrWindows > 0) {
+	    pDRIPriv->nrWalked = 0;
+	    TraverseTree(WindowTable[pScreen->myNum], DRIDCNTreeTraversal,
+			 (pointer)pDRIWindows);
+	}
+
+	pDRIInfo->ClipNotify(pScreen, pDRIWindows, pDRIPriv->nrWindows);
+
+	xfree(pDRIWindows);
+    }
+}
+
 static void
 DRIIncreaseNumberVisible(ScreenPtr pScreen)
 {
@@ -1022,6 +1071,8 @@ DRIIncreaseNumberVisible(ScreenPtr pScreen)
     default:
 	break;
     }
+
+    DRIDriverClipNotify(pScreen);
 }
 
 static void
@@ -1039,6 +1090,8 @@ DRIDecreaseNumberVisible(ScreenPtr pScreen)
     default:
 	break;
     }
+
+    DRIDriverClipNotify(pScreen);
 }
 
 Bool
@@ -1880,6 +1933,8 @@ DRIClipNotify(WindowPtr pWin, int dx, int dy)
 	    DRIIncreaseNumberVisible(pScreen);
 	else if (!nrects && pDRIDrawablePriv->nrects)
 	    DRIDecreaseNumberVisible(pScreen);
+	else
+	    DRIDriverClipNotify(pScreen);
 
 	pDRIDrawablePriv->nrects = nrects;
 

hw/xfree86/dri/dri.h

@@ -107,7 +107,7 @@ typedef struct {
  */
 
 #define DRIINFO_MAJOR_VERSION   5
-#define DRIINFO_MINOR_VERSION   0
+#define DRIINFO_MINOR_VERSION   1
 #define DRIINFO_PATCH_VERSION   0
 
 typedef struct {
@@ -173,6 +173,9 @@ typedef struct {
     /* New with DRI version 4.1.0 */
     void        (*TransitionSingleToMulti3D)(ScreenPtr pScreen);
     void        (*TransitionMultiToSingle3D)(ScreenPtr pScreen);
+
+    /* New with DRI version 5.1.0 */
+    void        (*ClipNotify)(ScreenPtr pScreen, WindowPtr *ppWin, int num);
 } DRIInfoRec, *DRIInfoPtr;
 
 

hw/xfree86/dri/dristruct.h

@@ -89,6 +89,7 @@ typedef struct _DRIScreenPrivRec
     DRIInfoPtr		pDriverInfo;
     int                 nrWindows;
     int                 nrWindowsVisible;
+    int                 nrWalked;
     drm_clip_rect_t  private_buffer_rect; /* management of private buffers */
     DrawablePtr         fullscreen; /* pointer to fullscreen drawable */
     drm_clip_rect_t  fullscreen_rect; /* fake rect for fullscreen mode */