[Contextual Search] Add support for crushed sprites and animate the search provider icon

ui/android/resources/crushed_sprite_resource.h

+// Copyright 2015 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 UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_
+#define UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_
+
+#include <utility>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "ui/android/ui_android_export.h"
+#include "ui/gfx/android/java_bitmap.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace ui {
+
+// A resource that provides an unscaled bitmap and corresponding metadata for a
+// crushed sprite. A crushed sprite animation is run by drawing rectangles from
+// a bitmap to a canvas. Each frame in the animation draws its rectangles on top
+// of the previous frame.
+class UI_ANDROID_EXPORT CrushedSpriteResource :
+public base::RefCounted<CrushedSpriteResource> {
+ public:
+  typedef std::vector<std::pair<gfx::Rect, gfx::Rect>> FrameSrcDstRects;
+  typedef std::vector<FrameSrcDstRects> SrcDstRects;
+
+  // Creates a new CrushedSpriteResource. |bitmap_res_id| is the id for the
+  // for the source bitmap, |java_bitmap| is the source bitmap for the crushed
+  // sprite, |src_dst_rects| is a list of rectangles to draw for each frame, and
+  // |sprite_size| is the size of an individual sprite.
+  static scoped_refptr<CrushedSpriteResource> CreateFromJavaBitmap(
+      int bitmap_res_id,
+      const gfx::JavaBitmap& java_bitmap,
+      const SrcDstRects& src_dst_rects,
+      gfx::Size sprite_size);
+
+  // Sets the source bitmap to |java_bitmap|.
+  void SetBitmapFromJavaBitmap(const gfx::JavaBitmap& java_bitmap);
+
+  // Returns the source bitmap.
+  SkBitmap GetBitmap();
+
+  // Stores the bitmap for the last frame and evicts the source bitmap from
+  // memory. This should be called when the crushed sprite animation finishes
+  // if it is unlikely to be rerun.
+  void SetBitmapForLastFrame(SkBitmap last_frame_bitmap);
+
+  // Returns the bitmap for the last frame if available or an empty bitmap.
+  SkBitmap GetBitmapForLastFrame();
+
+  // Returns true if the source bitmap has been evicted from memory.
+  bool BitmapHasBeenEvictedFromMemory();
+
+  // Returns a list of rectangles to be drawn for |frame|.
+  FrameSrcDstRects GetRectanglesForFrame(int frame);
+
+  // Returns the size of an individual sprite.
+  gfx::Size GetSpriteSize();
+
+  // Returns the total number of frames in the sprite animation.
+  int GetFrameCount();
+
+  // Returns the resource id for the source bitmap.
+  int GetBitmapResourceId();
+
+ private:
+  friend class base::RefCounted<CrushedSpriteResource>;
+  CrushedSpriteResource(
+      int bitmap_res_id,
+      const SkBitmap& bitmap,
+      const SrcDstRects& src_dst_rects,
+      gfx::Size sprite_size);
+  ~CrushedSpriteResource();
+
+  SkBitmap bitmap_;
+  SkBitmap last_frame_bitmap_;
+  SrcDstRects src_dst_rects_;
+  gfx::Size sprite_size_;
+  int bitmap_res_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrushedSpriteResource);
+};
+
+}  // namespace ui
+
+#endif  // UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_