android: add ThumbnailCache

chrome/browser/android/thumbnail/thumbnail_impl.h

+// Copyright 2014 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 CHROME_BROWSER_ANDROID_THUMBNAIL_THUMBNAIL_IMPL_H_
+#define CHROME_BROWSER_ANDROID_THUMBNAIL_THUMBNAIL_IMPL_H_
+
+#include "chrome/browser/android/thumbnail/thumbnail.h"
+#include "content/public/browser/android/ui_resource_client_android.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/geometry/size_f.h"
+
+class ThumbnailCache;
+
+namespace base {
+class File;
+}
+
+namespace content {
+class UIResourceProvider;
+}
+
+class ThumbnailImpl;
+class ThumbnailImplManager {
+ public:
+  virtual void InvalidateCachedThumbnail(
+      scoped_refptr<ThumbnailImpl> thumbnail) = 0;
+  virtual ~ThumbnailImplManager() {}
+};
+
+class ThumbnailImpl : public Thumbnail,
+                      public content::UIResourceClientAndroid {
+ public:
+  ThumbnailImpl(TabId tab_id,
+                const SkBitmap& bitmap,
+                float scale,
+                ThumbnailImplManager* thumbnail_impl_manager,
+                content::UIResourceProvider* ui_resource_provider);
+  bool IsValid() const;
+
+  // Thumbnail implementation.
+  virtual gfx::Size GetScaledContentSize() const OVERRIDE;
+  virtual gfx::SizeF GetScaledDataSize() const OVERRIDE;
+  virtual cc::UIResourceId ui_resource_id() const OVERRIDE {
+    return ui_resource_id_;
+  }
+  virtual TabId tab_id() const OVERRIDE { return tab_id_; }
+
+  static void Compress(scoped_refptr<ThumbnailImpl> in_thumbnail,
+                       scoped_refptr<ThumbnailImpl> out_thumbnail);
+  static bool WriteToFile(scoped_refptr<ThumbnailImpl> thumbnail,
+                          base::File& file);
+  static bool ReadFromFile(base::File& file,
+                           scoped_refptr<ThumbnailImpl> thumbnail);
+
+  scoped_refptr<ThumbnailImpl> PassDataToNewThumbnail();
+
+  // content::UIResourceClient implementation.
+  virtual cc::UIResourceBitmap GetBitmap(cc::UIResourceId uid,
+                                         bool resource_lost) OVERRIDE;
+
+  // content::UIResourceClientAndroid implementation.
+  virtual void UIResourceIsInvalid() OVERRIDE;
+
+ protected:
+  virtual ~ThumbnailImpl();
+
+ private:
+  void CleanupUIResource();
+  void BuildUIResource();
+  void SetRawData(SkBitmap bitmap, float scale);
+  void SetCompressedData(skia::RefPtr<SkPixelRef> compressed_data,
+                         float scale,
+                         const gfx::Size& content_size);
+  TabId tab_id_;
+  cc::UIResourceId ui_resource_id_;
+  SkBitmap raw_data_;
+  skia::RefPtr<SkPixelRef> compressed_data_;
+  float scale_;
+  gfx::Size data_size_;
+  gfx::Size content_size_;
+
+  ThumbnailImplManager* thumbnail_impl_manager_;
+  content::UIResourceProvider* ui_resource_provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThumbnailImpl);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_THUMBNAIL_THUMBNAIL_IMPL_H_