Implement remaining SkBitmapOperations as ImageSkiaOperations

ui/gfx/image/image_skia.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/image/image_skia.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/gfx/image/image_skia_operations.h"
 #include "ui/gfx/image/image_skia_source.h"
+#include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/skia_util.h"
 
 namespace gfx {
 namespace {
 
 // static
 gfx::ImageSkiaRep& NullImageRep() {
   CR_DEFINE_STATIC_LOCAL(ImageSkiaRep, null_image_rep, ());
   return null_image_rep;
@@ skipping 234 matching lines @@
 
 gfx::Size ImageSkia::size() const {
   return gfx::Size(width(), height());
 }
 
 int ImageSkia::height() const {
   return isNull() ? 0 : storage_->size().height();
 }
 
 bool ImageSkia::extractSubset(ImageSkia* dst, const SkIRect& subset) const {
-  if (isNull())
-    return false;
-  ImageSkia image;
-  ImageSkiaReps& image_reps = storage_->image_reps();
-  for (ImageSkiaReps::iterator it = image_reps.begin();
-       it != image_reps.end(); ++it) {
-    const ImageSkiaRep& image_rep = *it;
-    float dip_scale = image_rep.GetScale();
-    // Rounding boundary in case of a non-integer scale factor.
-    int x = static_cast<int>(subset.left() * dip_scale + 0.5);
-    int y = static_cast<int>(subset.top() * dip_scale + 0.5);
-    int w = static_cast<int>(subset.width() * dip_scale + 0.5);
-    int h = static_cast<int>(subset.height() * dip_scale + 0.5);
-    SkBitmap dst_bitmap;
-    SkIRect scaled_subset = SkIRect::MakeXYWH(x, y, w, h);
-    if (image_rep.sk_bitmap().extractSubset(&dst_bitmap, scaled_subset))
-      image.AddRepresentation(ImageSkiaRep(dst_bitmap,
-                                           image_rep.scale_factor()));
-  }
-  if (image.empty())
-    return false;
-
-  *dst = image;
-  return true;
+  gfx::Rect rect(subset.x(), subset.y(), subset.width(), subset.height());
+  *dst = ImageSkiaOperations::ExtractSubset(*this, rect);
+  return (!dst->isNull());
 }
 
 std::vector<ImageSkiaRep> ImageSkia::image_reps() const {
   if (isNull())
     return std::vector<ImageSkiaRep>();
 
   return storage_->image_reps();
 }
 
 const SkBitmap* ImageSkia::bitmap() const {
@@ skipping 13 matching lines @@
   if (image_rep.sk_bitmap().empty()) {
     storage_ = NULL;
     return;
   }
   storage_ = new internal::ImageSkiaStorage(
       NULL, gfx::Size(image_rep.GetWidth(), image_rep.GetHeight()));
   storage_->image_reps().push_back(image_rep);
 }
 
 }  // namespace gfx