Initial checkin of the new Mozart compositor.

services/gfx/compositor/render/render_frame.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 SERVICES_GFX_COMPOSITOR_RENDER_RENDER_FRAME_H_
+#define SERVICES_GFX_COMPOSITOR_RENDER_RENDER_FRAME_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "mojo/services/gfx/composition/interfaces/hit_tests.mojom.h"
+#include "mojo/services/gfx/composition/interfaces/scheduling.mojom.h"
+#include "third_party/skia/include/core/SkRect.h"
+
+class SkCanvas;
+struct SkPoint;
+
+namespace compositor {
+
+class RenderLayer;
+
+// Describes a sequence of drawing commands to be evaluated as a single pass.
+// Frames are introduced into the render frame at points where blending must
+// occur or where portions of a scene graph may be drawn once into a temporary
+// buffer and used many times.
+//
+// Render objects are thread-safe, immutable, and reference counted via
+// std::shared_ptr.  They have no direct references to the scene graph.
+class RenderFrame {
+ public:
+  RenderFrame(const std::shared_ptr<RenderLayer>& root_layer,
+              const SkRect& viewport,
+              const mojo::gfx::composition::FrameInfo& frame_info);
+  ~RenderFrame();
+
+  static std::shared_ptr<RenderFrame> Create(
+      const std::shared_ptr<RenderLayer>& root_layer,
+      const SkRect& viewport,
+      const mojo::gfx::composition::FrameInfo& frame_info) {
+    return std::make_shared<RenderFrame>(root_layer, viewport, frame_info);
+  }
+
+  // Gets the root layer of the frame.
+  const std::shared_ptr<RenderLayer>& root_layer() const { return root_layer_; }
+
+  // Gets the frame's viewport.
+  const SkRect& viewport() const { return viewport_; }
+
+  // Gets information about the frame to be rendered.
+  const mojo::gfx::composition::FrameInfo& frame_info() const {
+    return frame_info_;
+  }
+
+  // Paints the frame to a canvas.
+  void Paint(SkCanvas* canvas) const;
+
+  // Performs a hit test on the content of the frame.
+  mojo::gfx::composition::HitTestResultPtr HitTest(const SkPoint& point) const;
+
+ private:
+  friend class RenderFrameBuilder;
+
+  std::shared_ptr<RenderLayer> root_layer_;
+  SkRect viewport_;
+  mojo::gfx::composition::FrameInfo frame_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderFrame);
+};
+
+}  // namespace compositor
+
+#endif  // SERVICES_GFX_COMPOSITOR_RENDER_RENDER_FRAME_H_