Add image->bitmap

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 "SkData.h"
@@ skipping 239 matching lines @@
         const SkImageInfo info = bm.info();
         return SkNEW_ARGS(SkImage_Gpu, (info.width(), info.height(), info.alphaType(),
                                         tex, 0, SkSurface::kNo_Budgeted));
     }
 #endif
 
     // This will check for immutable (share or copy)
     return SkNewImageFromRasterBitmap(bm, false, NULL);
 }
 
+bool SkImage::asLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode mode) const {
+    return as_IB(this)->onAsLegacyBitmap(bitmap, mode);
+}
+
+bool SkImage_Base::onAsLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode mode) const {
+    // As the base-class, all we can do is make a copy (regardless of mode).
+    // Subclasses that want to be more optimal should override.
+    SkImageInfo info = SkImageInfo::MakeN32(this->width(), this->height(),
+                                    this->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
+    if (!bitmap->tryAllocPixels(info)) {
+        return false;
+    }
+    if (!this->readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(), 0, 0)) {
+        bitmap->reset();
+        return false;
+    }
+
+    if (kRO_LegacyBitmapMode == mode) {
+        bitmap->setImmutable();
+    }
+    return true;
+}
+
 //////////////////////////////////////////////////////////////////////////////////////
 
 #if !SK_SUPPORT_GPU
 
 SkImage* SkImage::NewFromTexture(GrContext*, const GrBackendTextureDesc&, SkAlphaType,
                                  TextureReleaseProc, ReleaseContext) {
     return NULL;
 }
 
 SkImage* SkImage::NewFromAdoptedTexture(GrContext*, const GrBackendTextureDesc&, SkAlphaType) {
     return NULL;
 }
 
 SkImage* SkImage::NewFromTextureCopy(GrContext*, const GrBackendTextureDesc&, SkAlphaType) {
     return NULL;
 }
 
 #endif