hide virtuals on device for width/height/isopaque

src/core/SkDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDevice.h"
 #include "SkMetaData.h"
 
@@ skipping 31 matching lines @@
 
 SkMetaData& SkBaseDevice::getMetaData() {
     // metadata users are rare, so we lazily allocate it. If that changes we
     // can decide to just make it a field in the device (rather than a ptr)
     if (NULL == fMetaData) {
         fMetaData = new SkMetaData;
     }
     return *fMetaData;
 }
 
-// TODO: should make this guy pure-virtual.
 SkImageInfo SkBaseDevice::imageInfo() const {
-    return SkImageInfo::MakeUnknown(this->width(), this->height());
+    return SkImageInfo::MakeUnknown();
 }
 
 const SkBitmap& SkBaseDevice::accessBitmap(bool changePixels) {
     const SkBitmap& bitmap = this->onAccessBitmap();
     if (changePixels) {
         bitmap.notifyPixelsChanged();
     }
     return bitmap;
 }
 
@@ skipping 71 matching lines @@
 }
 
 void SkBaseDevice::EXPERIMENTAL_purge(const SkPicture* picture) {
     // Derived-classes may have data to purge but not the base class
 }
 
 bool SkBaseDevice::EXPERIMENTAL_drawPicture(SkCanvas* canvas, const SkPicture* picture) {
     // The base class doesn't perform any accelerated picture rendering
     return false;
 }