Migrate ArcBitmap to use typemapping

components/arc/bitmap/bitmap_struct_traits.h

+// Copyright 2016 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.
+
+#ifndef COMPONENT_ARC_BITMAP_BITMAP_STRUCT_TRAITS_H_
+#define COMPONENT_ARC_BITMAP_BITMAP_STRUCT_TRAITS_H_
+
+#include "components/arc/common/bitmap.mojom.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<arc::mojom::ArcBitmapDataView, SkBitmap> {
+  static const mojo::CArray<uint8_t> pixel_data(const SkBitmap& r) {
+    DCHECK(!r.drawsNothing());
+
+    const SkImageInfo& info = r.info();
+    DCHECK_EQ(info.colorType(), kRGBA_8888_SkColorType);
+
+    return mojo::CArray<uint8_t>(
+        r.getSize(), r.getSize(), static_cast<uint8_t*>(r.getPixels()));
+  }
+
+  static uint32_t width(const SkBitmap& r) {
+    return r.width();
+  }
+
+  static uint32_t height(const SkBitmap& r) {
+    return r.height();
+  }
+
+  static bool Read(arc::mojom::ArcBitmapDataView data, SkBitmap* out) {

[dcheng, 2016/09/13 01:13:09]

Please out-of-line and place the definition of this method in a .cc file.
Anything that's not just calling a simple getter should probably be like that.
pixel_data() should also probably be out-of-lined.

[yoshiki, 2016/09/13 18:01:43]

Done.

+    mojo::ArrayDataView<uint8_t> pixel_data;
+    data.GetPixelDataDataView(&pixel_data);
+
+    SkImageInfo info = SkImageInfo::Make(
+        data.width(), data.height(),
+        kRGBA_8888_SkColorType, kPremul_SkAlphaType);
+    if (info.getSafeSize(info.minRowBytes()) > pixel_data.size()) {
+      // Insufficient buffer size.
+      return false;
+    }
+
+    // Create the SkBitmap object which wraps the arc bitmap pixels. This
+    // doesn't copy and |data| and |bitmap| share the buffer.
+    SkBitmap bitmap;
+    if (!bitmap.installPixels(info,
+            const_cast<uint8_t*>(pixel_data.data()),
+            info.minRowBytes())) {
+      // Error in installing pixels.
+      return false;
+    }
+
+    // Copy the pixels with converting color type.
+    if (!bitmap.copyTo(out, kN32_SkColorType)) {
+      // Error in copying or converting the color type.
+      return false;
+    }
+
+    return true;
+  }
+};
+
+}
+
+#endif  // COMPONENT_ARC_BITMAP_BITMAP_STRUCT_TRAITS_H_