UI Resource Manager

cc/resources/ui_resource_manager.h

+// Copyright 2013 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 CC_RESOURCES_UI_RESOURCE_MANAGER_H_
+#define CC_RESOURCES_UI_RESOURCE_MANAGER_H_
+
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "skia/ext/refptr.h"
+#include "ui/gfx/size.h"
+
+namespace cc {
+
+typedef int UIResourceId;
+
+class UIResourceManagerClient {
+ public:
+  enum UIResourceStatus {
+    NOT_READY,
+    READY,
+    LOST
+  };
+
+  virtual ~UIResourceManagerClient() {}
+
+  // This is called on the main thread when a recently created resource
+  // has been fully uploaded to a texture. Users of large resources may
+  // wish to wait for this callback before using the resource ID on a layer,
+  // to avoid jank until the upload completes.
+  virtual void UIResourceReady(UIResourceId id) = 0;
+
+  // This id is now invalid. The client is expected to keep track of all
+  // layers that were using it, and change them to stop using it (for
+  // example by calling CreateUIResource and assigning the new id to the
+  // layer).
+  virtual void UIResourceLost(UIResourceId id) = 0;
+};
+
+// Ref-counted bitmap class (can’t use SkBitmap because of ETC1)
+class UIResourceBitmap : public base::RefCountedThreadSafe<UIResourceBitmap> {
+ public:
+  enum UIResourceFormat {
+    RGBA8,
+    ETC1
+  };
+
+  ~UIResourceBitmap();
+
+  // Takes ownership of “pixels”.
+  static scoped_refptr<UIResourceBitmap> Create(void* pixels,
+                                                UIResourceFormat format,
+                                                gfx::Size size);
+
+  gfx::Size GetSize() const { return size_; }
+  UIResourceFormat GetFormat() const { return format_; }
+  void* GetPixels() { return pixels_; }
+
+ private:
+  void* pixels_;
+  UIResourceFormat format_;
+  gfx::Size size_;
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_UI_RESOURCE_MANAGER_H_