Add a screen resize hook to xf86CrtcConfigRec.

This hook is called when the DDX needs to resize the screen.  The driver is
responsible for changing virtualX and virtualY, along with any other related
screen properties (devPrivate.ptr, devKind, displayWidth, etc.).

Use the size range from the crtc config instead of randrp->virtual[XY] when
reporting the min and max screen sizes to the DDX.

hw/xfree86/modes/xf86Crtc.c

@@ -52,13 +52,17 @@
 int xf86CrtcConfigPrivateIndex = -1;
 
 void
-xf86CrtcConfigInit (ScrnInfoPtr scrn)
+xf86CrtcConfigInit (ScrnInfoPtr scrn,
+		    const xf86CrtcConfigFuncsRec *funcs)
 {
     xf86CrtcConfigPtr	config;
 
     if (xf86CrtcConfigPrivateIndex == -1)
 	xf86CrtcConfigPrivateIndex = xf86AllocateScrnInfoPrivateIndex();
     config = xnfcalloc (1, sizeof (xf86CrtcConfigRec));
+
+    config->funcs = funcs;
+
     scrn->privates[xf86CrtcConfigPrivateIndex].ptr = config;
 }
 

hw/xfree86/modes/xf86Crtc.h

@@ -407,6 +407,25 @@ struct _xf86Output {
 #endif
 };
 
+typedef struct _xf86CrtcConfigFuncs {
+    /**
+     * Requests that the driver resize the screen.
+     *
+     * The driver is responsible for updating scrn->virtualX and scrn->virtualY.
+     * If the requested size cannot be set, the driver should leave those values
+     * alone and return FALSE.
+     *
+     * A naive driver that cannot reallocate the screen may simply change
+     * virtual[XY].  A more advanced driver will want to also change the
+     * devPrivate.ptr and devKind of the screen pixmap, update any offscreen
+     * pixmaps it may have moved, and change pScrn->displayWidth.
+     */
+    Bool
+    (*resize)(ScrnInfoPtr	scrn,
+	      int		width,
+	      int		height);
+} xf86CrtcConfigFuncsRec, *xf86CrtcConfigFuncsPtr;
+
 typedef struct _xf86CrtcConfig {
     int			num_output;
     xf86OutputPtr	*output;
@@ -435,6 +454,8 @@ typedef struct _xf86CrtcConfig {
     int			dga_width, dga_height, dga_stride;
     DisplayModePtr	dga_save_mode;
 
+    const xf86CrtcConfigFuncsRec *funcs;
+
 } xf86CrtcConfigRec, *xf86CrtcConfigPtr;
 
 extern int xf86CrtcConfigPrivateIndex;
@@ -446,7 +467,8 @@ extern int xf86CrtcConfigPrivateIndex;
  */
 
 void
-xf86CrtcConfigInit (ScrnInfoPtr		scrn);
+xf86CrtcConfigInit (ScrnInfoPtr				scrn,
+		    const xf86CrtcConfigFuncsRec	*funcs);
 
 void
 xf86CrtcSetSizeRange (ScrnInfoPtr scrn,

hw/xfree86/modes/xf86RandR12.c

@@ -335,8 +335,9 @@ xf86RandR12ScreenSetSize (ScreenPtr	pScreen,
 {
     XF86RandRInfoPtr	randrp = XF86RANDRINFO(pScreen);
     ScrnInfoPtr		pScrn = XF86SCRNINFO(pScreen);
+    xf86CrtcConfigPtr	config = XF86_CRTC_CONFIG_PTR(pScrn);
     WindowPtr		pRoot = WindowTable[pScreen->myNum];
-    Bool 		ret = TRUE;
+    Bool		ret = FALSE;
 
     if (randrp->virtualX == -1 || randrp->virtualY == -1)
     {
@@ -345,20 +346,26 @@ xf86RandR12ScreenSetSize (ScreenPtr	pScreen,
     }
     if (pRoot)
 	(*pScrn->EnableDisableFBAccess) (pScreen->myNum, FALSE);
-    pScrn->virtualX = width;
-    pScrn->virtualY = height;
 
-    pScreen->width = pScrn->virtualX;
-    pScreen->height = pScrn->virtualY;
+    /* Let the driver update virtualX and virtualY */
+    if (!(*config->funcs->resize)(pScrn, width, height))
+	goto finish;
+
+    ret = TRUE;
+
+    pScreen->width = width;
+    pScreen->height = height;
     pScreen->mmWidth = mmWidth;
     pScreen->mmHeight = mmHeight;
 
     xf86SetViewport (pScreen, pScreen->width-1, pScreen->height-1);
     xf86SetViewport (pScreen, 0, 0);
+
+finish:
     if (pRoot)
 	(*pScrn->EnableDisableFBAccess) (pScreen->myNum, TRUE);
 #if RANDR_12_INTERFACE
-    if (WindowTable[pScreen->myNum])
+    if (WindowTable[pScreen->myNum] && ret)
 	RRScreenSizeNotify (pScreen);
 #endif
     return ret;
@@ -1011,15 +1018,14 @@ xf86RandR12CreateScreenResources12 (ScreenPtr pScreen)
 {
     int			c;
     ScrnInfoPtr		pScrn = xf86Screens[pScreen->myNum];
-    XF86RandRInfoPtr	randrp = XF86RANDRINFO(pScreen);
     xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(pScrn);
 
     for (c = 0; c < config->num_crtc; c++)
 	xf86RandR12CrtcNotify (config->crtc[c]->randr_crtc);
 
 
-    RRScreenSetSizeRange (pScreen, 320, 240,
-			  randrp->virtualX, randrp->virtualY);
+    RRScreenSetSizeRange (pScreen, config->minWidth, config->minHeight,
+			  config->maxWidth, config->maxHeight);
     return TRUE;
 }