[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/scoped_ptr.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/android/ui_android_export.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace cc {
+class LayerTreeHost;
+class ScopedUIResource;
+typedef int UIResourceId;
+}
+
+namespace gfx {
+class JavaBitmap;
+}
+
+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:
+  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.
+  CrushedSpriteResource(const SkBitmap& bitmap,
+                        const SrcDstRects& src_dst_rects,
+                        gfx::Size sprite_size);
+  ~CrushedSpriteResource();
+
+  // Sets the source bitmap.
+  void SetBitmap(const SkBitmap& bitmap);
+
+  // Returns the source bitmap.
+  const SkBitmap& GetBitmap();
+
+  // 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();
+
+ private:
+  SkBitmap bitmap_;
+  scoped_ptr<cc::ScopedUIResource> last_frame_resource_;
+  SrcDstRects src_dst_rects_;
+  gfx::Size sprite_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrushedSpriteResource);
+};
+
+}  // namespace ui
+
+#endif  // UI_ANDROID_RESOURCES_CRUSHED_SPRITE_RESOURCE_H_