Handle non-zero origin rotated crtc. Damage crtc area on re-rotate.

Box transformation from source to dest area was broken, leaving the wrong
areas painted when the crtc origin was non-zero.

When rotating from left to right, the pixmap doesn't get reallocated, and so
no damage was left in the pixmap from xf86RotatePrepare. Separately damage
the whole crtc area when this occurs to repaint the area.

hw/xfree86/modes/xf86Rotate.c

@@ -69,31 +69,44 @@ compWindowFormat (WindowPtr pWin)
 }
 
 static void
-xf86RotateBox (BoxPtr dst, BoxPtr src, Rotation rotation,
-	       int dest_width, int dest_height)
+xf86TranslateBox (BoxPtr b, int dx, int dy)
 {
+    b->x1 += dx;
+    b->y1 += dy;
+    b->x2 += dx;
+    b->y2 += dy;
+}
+
+static void
+xf86TransformBox (BoxPtr dst, BoxPtr src, Rotation rotation,
+		  int xoff, int yoff,
+		  int dest_width, int dest_height)
+{
+    BoxRec  stmp = *src;
+
+    xf86TranslateBox (&stmp, -xoff, -yoff);
     switch (rotation & 0xf) {
     default:
     case RR_Rotate_0:
-	*dst = *src;
+	*dst = stmp;
 	break;
     case RR_Rotate_90:
-	dst->x1 = src->y1;
-	dst->y1 = dest_height - src->x2;
-	dst->x2 = src->y2;
-	dst->y2 = dest_height - src->x1;
+	dst->x1 = stmp.y1;
+	dst->y1 = dest_height - stmp.x2;
+	dst->x2 = stmp.y2;
+	dst->y2 = dest_height - stmp.x1;
 	break;
     case RR_Rotate_180:
-	dst->x1 = dest_width - src->x2;
-	dst->y1 = dest_height - src->y2;
-	dst->x2 = dest_width - src->x1;
-	dst->y2 = dest_height - src->y1;
+	dst->x1 = dest_width - stmp.x2;
+	dst->y1 = dest_height - stmp.y2;
+	dst->x2 = dest_width - stmp.x1;
+	dst->y2 = dest_height - stmp.y1;
 	break;
     case RR_Rotate_270:
-	dst->x1 = dest_width - src->y2;
-	dst->y1 = src->x1;
-	dst->y2 = src->x2;
-	dst->x2 = dest_width - src->y1;
+	dst->x1 = dest_width - stmp.y2;
+	dst->y1 = stmp.x1;
+	dst->y2 = stmp.x2;
+	dst->x2 = dest_width - stmp.y1;
 	break;
     }
     if (rotation & RR_Reflect_X) {
@@ -194,8 +207,11 @@ xf86RotateCrtcRedisplay (xf86CrtcPtr crtc, RegionPtr region)
     {
 	BoxRec	dst_box;
 
-	xf86RotateBox (&dst_box, b, crtc->rotation,
-		       crtc->mode.HDisplay, crtc->mode.VDisplay);
+	ErrorF ("painting %d,%d - %d,%d\n",
+		b->x1, b->y1, b->x2, b->y2);
+	xf86TransformBox (&dst_box, b, crtc->rotation,
+			  crtc->x, crtc->y,
+			  crtc->mode.HDisplay, crtc->mode.VDisplay);
 	CompositePicture (PictOpSrc,
 			  src, NULL, dst,
 			  dst_box.x1, dst_box.y1, 0, 0, dst_box.x1, dst_box.y1,
@@ -207,6 +223,26 @@ xf86RotateCrtcRedisplay (xf86CrtcPtr crtc, RegionPtr region)
     FreePicture (dst, None);
 }
 
+static void
+xf86CrtcDamageShadow (xf86CrtcPtr crtc)
+{
+    ScrnInfoPtr	pScrn = crtc->scrn;
+    BoxRec	damage_box;
+    RegionRec   damage_region;
+    ScreenPtr	pScreen = pScrn->pScreen;
+
+    damage_box.x1 = crtc->x;
+    damage_box.x2 = crtc->x + xf86ModeWidth (&crtc->mode, crtc->rotation);
+    damage_box.y1 = crtc->y;
+    damage_box.y2 = crtc->y + xf86ModeHeight (&crtc->mode, crtc->rotation);
+    ErrorF ("damaged %d,%d - %d,%d\n",
+	    damage_box.x1, damage_box.y1, damage_box.x2, damage_box.y2);
+    REGION_INIT (pScreen, &damage_region, &damage_box, 1);
+    DamageDamageRegion (&(*pScreen->GetScreenPixmap)(pScreen)->drawable,
+			&damage_region);
+    REGION_UNINIT (pScreen, &damage_region);
+}
+
 static void
 xf86RotatePrepare (ScreenPtr pScreen)
 {
@@ -220,9 +256,6 @@ xf86RotatePrepare (ScreenPtr pScreen)
 
 	if (crtc->rotatedData && !crtc->rotatedPixmap)
 	{
-	    BoxRec	    damage_box;
-	    RegionRec   damage_region;
-
 	    crtc->rotatedPixmap = crtc->funcs->shadow_create (crtc,
 							     crtc->rotatedData,
 							     crtc->mode.HDisplay,
@@ -231,14 +264,7 @@ xf86RotatePrepare (ScreenPtr pScreen)
 	    DamageRegister (&(*pScreen->GetScreenPixmap)(pScreen)->drawable,
 			    xf86_config->rotationDamage);
 
-	    damage_box.x1 = 0;
-	    damage_box.y1 = 0;
-	    damage_box.x2 = xf86ModeWidth (&crtc->mode, crtc->rotation);
-	    damage_box.y2 = xf86ModeHeight (&crtc->mode, crtc->rotation);
-	    REGION_INIT (pScreen, &damage_region, &damage_box, 1);
-	    DamageDamageRegion (&(*pScreen->GetScreenPixmap)(pScreen)->drawable,
-				&damage_region);
-	    REGION_UNINIT (pScreen, &damage_region);
+	    xf86CrtcDamageShadow (crtc);
 	}
     }
 }
@@ -357,6 +383,12 @@ xf86CrtcRotate (xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation)
 	    if (!shadowData)
 		goto bail1;
 	    crtc->rotatedData = shadowData;
+	    /* shadow will be damaged in xf86RotatePrepare */
+	}
+	else
+	{
+	    /* mark shadowed area as damaged so it will be repainted */
+	    xf86CrtcDamageShadow (crtc);
 	}
 
 	if (!xf86_config->rotationDamage)