Make filters use SkImage instead of SkBitmap

src/image/SkImage.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkImageGenerator.h"
@@ skipping 160 matching lines @@
     surface->getCanvas()->scale(newWidth / src.width(), newHeight / src.height());
     surface->getCanvas()->translate(-src.x(), -src.y());
 
     SkPaint paint;
     paint.setXfermodeMode(SkXfermode::kSrc_Mode);
     paint.setFilterQuality(quality);
     surface->getCanvas()->drawImage(this, 0, 0, &paint);
     return surface->newImageSnapshot();
 }
 
+inline static bool read_image_as_n32_bitmap(const SkImage* image, SkBitmap* bitmap) {
+    SkBitmap tmp;
+    if (!as_IB(image)->getROPixels(&tmp)) {
+        return false;
+    }
+    if (tmp.colorType() != kN32_SkColorType) {
+        return false;
+    }
 
+    tmp.lockPixels();
+    bitmap->swap(tmp);
+    return true;
+}
+
+SkAutoAdoptImageAsN32Bitmap::SkAutoAdoptImageAsN32Bitmap(SkAutoTUnref<const SkImage>& image,
+                                                         SkBitmap* bitmap)
+    : fBitmap(NULL) {
+    if (read_image_as_n32_bitmap(image, bitmap)) {
+        fBitmap = bitmap;
+        image.reset(NULL);
+    }
+}
+
+SkAutoImageAsN32Bitmap::SkAutoImageAsN32Bitmap(const SkImage* image, SkBitmap* bitmap)
+    : fBitmap(NULL) {
+    if (read_image_as_n32_bitmap(image, bitmap)) {
+        fBitmap = bitmap;
+    }
+}
+
+
+