1 files changed, 75 insertions, 0 deletions
diff --git a/cc/resources/layer_updater.h b/cc/resources/layer_updater.h
new file mode 100644
index 0000000..a8b7657
--- /dev/null
+++ b/cc/resources/layer_updater.h
@@ -0,0 +1,75 @@
+// Copyright 2011 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_LAYER_UPDATER_H_
+#define CC_RESOURCES_LAYER_UPDATER_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/base/cc_export.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/vector2d.h"
+
+namespace cc {
+
+class PrioritizedResource;
+class PrioritizedResourceManager;
+class ResourceUpdateQueue;
+class TextureManager;
+struct RenderingStats;
+
+class CC_EXPORT LayerUpdater : public base::RefCounted<LayerUpdater> {
+ public:
+  // Allows updaters to store per-resource update properties.
+  class CC_EXPORT Resource {
+   public:
+    virtual ~Resource();
+
+    PrioritizedResource* texture() { return texture_.get(); }
+    // TODO(reveman): partial_update should be a property of this class
+    // instead of an argument passed to Update().
+    virtual void Update(ResourceUpdateQueue* queue,
+                        gfx::Rect source_rect,
+                        gfx::Vector2d dest_offset,
+                        bool partial_update,
+                        RenderingStats* stats) = 0;
+   protected:
+    explicit Resource(scoped_ptr<PrioritizedResource> texture);
+
+   private:
+    scoped_ptr<PrioritizedResource> texture_;
+
+    DISALLOW_COPY_AND_ASSIGN(Resource);
+  };
+
+  LayerUpdater() {}
+
+  virtual scoped_ptr<Resource> CreateResource(
+      PrioritizedResourceManager* manager) = 0;
+  // The |resulting_opaque_rect| gives back a region of the layer that was
+  // painted opaque. If the layer is marked opaque in the updater, then this
+  // region should be ignored in preference for the entire layer's area.
+  virtual void PrepareToUpdate(gfx::Rect content_rect,
+                               gfx::Size tile_size,
+                               float contents_width_scale,
+                               float contents_height_scale,
+                               gfx::Rect* resulting_opaque_rect,
+                               RenderingStats* stats) {}
+
+  // Set true by the layer when it is known that the entire output is going to
+  // be opaque.
+  virtual void SetOpaque(bool opaque) {}
+
+ protected:
+  virtual ~LayerUpdater() {}
+
+ private:
+  friend class base::RefCounted<LayerUpdater>;
+
+  DISALLOW_COPY_AND_ASSIGN(LayerUpdater);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_LAYER_UPDATER_H_