Fix shadow framebuffer, and by extension rotation.

Based on Adam Jackson's shadow framebuffer fixes in xf86-video-vesa.

src/fbdev.c

@@ -63,11 +63,6 @@ static Bool	FBDevDriverFunc(ScrnInfoPtr pScrn, xorgDriverFuncOp op,
 
 enum { FBDEV_ROTATE_NONE=0, FBDEV_ROTATE_CW=270, FBDEV_ROTATE_UD=180, FBDEV_ROTATE_CCW=90 };
 
-/*static ShadowUpdateProc updateFuncs[] =
-  { shadowUpdatePacked, shadowUpdateRotate8_270, shadowUpdateRotate8_180, shadowUpdateRotate8_90,
-    shadowUpdatePacked, shadowUpdateRotate16_270, shadowUpdateRotate16_180, shadowUpdateRotate16_90,
-    shadowUpdatePacked, shadowUpdateRotate32_270, shadowUpdateRotate32_180, shadowUpdateRotate32_90 }; */
-
 
 /* -------------------------------------------------------------------- */
 
@@ -234,7 +229,9 @@ typedef struct {
 	int				lineLength;
 	int				rotate;
 	Bool				shadowFB;
+	void				*shadow;
 	CloseScreenProcPtr		CloseScreen;
+	CreateScreenResourcesProcPtr	CreateScreenResources;
 	void				(*PointerMoved)(int index, int x, int y);
 	EntityInfoPtr			pEnt;
 	/* DGA info */
@@ -613,33 +610,47 @@ FBDevPreInit(ScrnInfoPtr pScrn, int flags)
 	return TRUE;
 }
 
+
 static Bool
-FBDevShadowInit(ScreenPtr pScreen, FBDevPtr fPtr)
+FBDevCreateScreenResources(ScreenPtr pScreen)
 {
     PixmapPtr pPixmap;
-    ShadowUpdateProc update;
-    ShadowWindowProc window;
-    
-    pPixmap = pScreen->CreatePixmap(pScreen, pScreen->width, pScreen->height,
-				    pScreen->rootDepth);
-    if (!pPixmap)
+    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
+    FBDevPtr fPtr = FBDEVPTR(pScrn);
+    Bool ret;
+
+    pScreen->CreateScreenResources = fPtr->CreateScreenResources;
+    ret = pScreen->CreateScreenResources(pScreen);
+    pScreen->CreateScreenResources = FBDevCreateScreenResources;
+
+    if (!ret)
+	return FALSE;
+
+    pPixmap = pScreen->GetScreenPixmap(pScreen);
+
+    if (!shadowAdd(pScreen, pPixmap, fPtr->rotate ?
+		   shadowUpdateRotatePackedWeak() : shadowUpdatePackedWeak(),
+		   FBDevWindowLinear, fPtr->rotate, NULL)) {
 	return FALSE;
+    }
+
+    return TRUE;
+}
+
+static Bool
+FBDevShadowInit(ScreenPtr pScreen)
+{
+    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
+    FBDevPtr fPtr = FBDEVPTR(pScrn);
     
     if (!shadowSetup(pScreen)) {
-	pScreen->DestroyPixmap(pPixmap);
 	return FALSE;
     }
 
-    update = fPtr->rotate ? shadowUpdateRotatePackedWeak()
-	: shadowUpdatePackedWeak();
+    fPtr->CreateScreenResources = pScreen->CreateScreenResources;
+    pScreen->CreateScreenResources = FBDevCreateScreenResources;
 
-    if (!shadowAdd(pScreen, pPixmap, update, FBDevWindowLinear,
-		   fPtr->rotate, NULL)) {
-	pScreen->DestroyPixmap(pPixmap);
-	return FALSE;
-    } else {
-	return TRUE;
-    }	    
+    return TRUE;
 }
 
 
@@ -650,7 +661,7 @@ FBDevScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 	FBDevPtr fPtr = FBDEVPTR(pScrn);
 	VisualPtr visual;
 	int init_picture = 0;
-	int ret,flags,width,height;
+	int ret, flags;
 	int type;
 
 	TRACE_ENTER("FBDevScreenInit");
@@ -707,11 +718,9 @@ FBDevScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 
 	if(fPtr->rotate==FBDEV_ROTATE_CW || fPtr->rotate==FBDEV_ROTATE_CCW)
 	{
-	  height = pScrn->virtualX;
-	  width = pScrn->displayWidth = pScrn->virtualY;
-	} else {
-	  height = pScrn->virtualY;
-	  width = pScrn->virtualX;
+	  int tmp = pScrn->virtualX;
+	  pScrn->virtualX = pScrn->displayWidth = pScrn->virtualY;
+	  pScrn->virtualY = tmp;
 	}
 
 	if(fPtr->rotate && !fPtr->PointerMoved) {
@@ -721,6 +730,17 @@ FBDevScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 
 	fPtr->fbstart = fPtr->fbmem + fPtr->fboff;
 
+	if (fPtr->shadowFB) {
+	    fPtr->shadow = xcalloc(1, pScrn->virtualX * pScrn->virtualY *
+				   pScrn->bitsPerPixel);
+
+	    if (!fPtr->shadow) {
+		xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+			   "Failed to allocate shadow framebuffer\n");
+		return FALSE;
+	    }
+	}
+
 	switch ((type = fbdevHWGetType(pScrn)))
 	{
 #ifdef USE_AFB
@@ -751,8 +771,11 @@ FBDevScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 		case 16:
 		case 24:
 		case 32:
-			ret = fbScreenInit(pScreen, fPtr->fbstart, width, height,
-					   pScrn->xDpi, pScrn->yDpi, pScrn->displayWidth, pScrn->bitsPerPixel);
+			ret = fbScreenInit(pScreen, fPtr->shadowFB ? fPtr->shadow
+					   : fPtr->fbstart, pScrn->virtualX,
+					   pScrn->virtualY, pScrn->xDpi,
+					   pScrn->yDpi, pScrn->displayWidth,
+					   pScrn->bitsPerPixel);
 			init_picture = 1;
 			break;
 	 	default:
@@ -817,7 +840,7 @@ FBDevScreenInit(int scrnIndex, ScreenPtr pScreen, int argc, char **argv)
 		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 			   "Render extension initialisation failed\n");
 
-	if (fPtr->shadowFB && !FBDevShadowInit(pScreen, fPtr)) {
+	if (fPtr->shadowFB && !FBDevShadowInit(pScreen)) {
 	    xf86DrvMsg(scrnIndex, X_ERROR,
 		       "shadow framebuffer initialization failed\n");
 	    return FALSE;
@@ -920,6 +943,10 @@ FBDevCloseScreen(int scrnIndex, ScreenPtr pScreen)
 	
 	fbdevHWRestore(pScrn);
 	fbdevHWUnmapVidmem(pScrn);
+	if (fPtr->shadow) {
+	    xfree(fPtr->shadow);
+	    fPtr->shadow = NULL;
+	}
 	if (fPtr->pDGAMode) {
 	  xfree(fPtr->pDGAMode);
 	  fPtr->pDGAMode = NULL;
@@ -927,6 +954,7 @@ FBDevCloseScreen(int scrnIndex, ScreenPtr pScreen)
 	}
 	pScrn->vtSema = FALSE;
 
+	pScreen->CreateScreenResources = fPtr->CreateScreenResources;
 	pScreen->CloseScreen = fPtr->CloseScreen;
 	return (*pScreen->CloseScreen)(scrnIndex, pScreen);
 }
@@ -952,7 +980,7 @@ FBDevWindowLinear(ScreenPtr pScreen, CARD32 row, CARD32 offset, int mode,
     else
       *size = fPtr->lineLength = fbdevHWGetLineLength(pScrn);
 
-    return ((CARD8 *)fPtr->fbmem + fPtr->fboff + row * fPtr->lineLength + offset);
+    return ((CARD8 *)fPtr->fbstart + row * fPtr->lineLength + offset);
 }
 
 static void