[PATCH] dri2: Invalidate DRI2Buffers upon SetWindowPixmap updates

[Chris Wilson]

When transitioning to a redirected or unredirected Window, the Composite
layer modifies the Window's Pixmap. However, the DRI2Buffer for the
Drawable is still pointing to the backing bo of the old Pixmap with the
result that rendering goes astray.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Reinis Danne <reinis.danne at gmail.com>
---
 hw/xfree86/dri2/dri2.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/hw/xfree86/dri2/dri2.c b/hw/xfree86/dri2/dri2.c
index 804664e..063a351 100644
--- a/hw/xfree86/dri2/dri2.c
+++ b/hw/xfree86/dri2/dri2.c
@@ -133,6 +133,7 @@ typedef struct _DRI2Screen {
     DRI2AsyncSwapProcPtr AsyncSwap;
 
     ConfigNotifyProcPtr ConfigNotify;
+    SetWindowPixmapProcPtr SetWindowPixmap;
     DRI2CreateBuffer2ProcPtr CreateBuffer2;
     DRI2DestroyBuffer2ProcPtr DestroyBuffer2;
     DRI2CopyRegion2ProcPtr CopyRegion2;
@@ -1417,6 +1418,21 @@ DRI2ConfigNotify(WindowPtr pWin, int x, int y, int w, int h, int bw,
     return Success;
 }
 
+static void
+DRI2SetWindowPixmap(WindowPtr pWin, PixmapPtr pPix)
+{
+    DrawablePtr pDraw = (DrawablePtr) pWin;
+    ScreenPtr pScreen = pDraw->pScreen;
+    DRI2ScreenPtr ds = DRI2GetScreen(pScreen);
+
+    pScreen->SetWindowPixmap = ds->SetWindowPixmap;
+    (*pScreen->SetWindowPixmap) (pWin, pPix);
+    ds->SetWindowPixmap = pScreen->SetWindowPixmap;
+    pScreen->SetWindowPixmap = DRI2SetWindowPixmap;
+
+    DRI2Invalidate(pDraw);
+}
+
 #define MAX_PRIME DRI2DriverPrimeMask
 static int
 get_prime_id(void)
@@ -1569,6 +1585,9 @@ DRI2ScreenInit(ScreenPtr pScreen, DRI2InfoPtr info)
     ds->ConfigNotify = pScreen->ConfigNotify;
     pScreen->ConfigNotify = DRI2ConfigNotify;
 
+    ds->SetWindowPixmap = pScreen->SetWindowPixmap;
+    pScreen->SetWindowPixmap = DRI2SetWindowPixmap;
+
     xf86DrvMsg(pScreen->myNum, X_INFO, "[DRI2] Setup complete\n");
     for (i = 0; i < sizeof(driverTypeNames) / sizeof(driverTypeNames[0]); i++) {
         if (i < ds->numDrivers && ds->driverNames[i]) {
@@ -1593,6 +1612,7 @@ DRI2CloseScreen(ScreenPtr pScreen)
     DRI2ScreenPtr ds = DRI2GetScreen(pScreen);
 
     pScreen->ConfigNotify = ds->ConfigNotify;
+    pScreen->SetWindowPixmap = ds->SetWindowPixmap;
 
     if (ds->prime_id)
         prime_id_allocate_bitmask &= ~(1 << ds->prime_id);
-- 
1.7.10.4