Prototype: NativeLayer renderer with GL fallback

cc/output/native_layer_renderer.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 CC_OUTPUT_NATIVE_LAYER_RENDERER_H_
+#define CC_OUTPUT_NATIVE_LAYER_RENDERER_H_
+
+#include "cc/output/direct_renderer.h"
+
+namespace cc {
+
+class SolidColorDrawQuad;
+class TileDrawQuad;
+
+class CC_EXPORT NativeLayerRenderer : public DirectRenderer {
+ public:
+  static scoped_ptr<NativeLayerRenderer> Create(
+      RendererClient* client,
+      const RendererSettings* settings,
+      OutputSurface* output_surface,
+      ResourceProvider* resource_provider);
+
+  ~NativeLayerRenderer() override;
+
+  // DirectRenderer overrides.
+  const RendererCapabilitiesImpl& Capabilities() const override;
+  bool CanRender(const RenderPassList& render_passes) const override;
+  void Finish() override {}
+  void SwapBuffers(const CompositorFrameMetadata& metadata) override;
+
+ protected:
+  NativeLayerRenderer(RendererClient* client,
+                      const RendererSettings* settings,
+                      OutputSurface* output_surface,
+                      ResourceProvider* resource_provider);
+
+  // DirectRenderer overrides.
+  bool FlippedFramebuffer(const DrawingFrame* frame) const override;
+  bool BindFramebufferToTexture(DrawingFrame* frame,
+                                const ScopedResource* resource,
+                                const gfx::Rect& target_rect) override;
+  void BeginDrawingFrame(DrawingFrame* frame) override;
+  void DoDrawQuad(DrawingFrame* frame,
+                  const class DrawQuad*,
+                  const gfx::QuadF* draw_region) override;
+  void DidChangeVisibility() override {}
+  void BindFramebufferToOutputSurface(DrawingFrame* frame) override {}
+  void SetScissorTestRect(const gfx::Rect& scissor_rect) override {}
+  void PrepareSurfaceForPass(DrawingFrame* frame,
+                             SurfaceInitializationMode initialization_mode,
+                             const gfx::Rect& render_pass_scissor) override {}
+  void FinishDrawingFrame(DrawingFrame* frame) override {}
+  void EnsureScissorTestEnabled() override {}
+  void EnsureScissorTestDisabled() override {}
+  void CopyCurrentRenderPassToBitmap(
+      DrawingFrame* frame,
+      scoped_ptr<CopyOutputRequest> request) override {}
+
+ private:
+  void DrawSolidColorQuad(const SolidColorDrawQuad* quad);
+  void DrawTileQuad(const TileDrawQuad* quad);
+
+  gpu::ContextSupport* context_support_;
+  RendererCapabilitiesImpl capabilities_;
+
+  typedef ScopedPtrVector<ResourceProvider::ScopedReadLockGL>
+      OverlayResourceLockList;
+  OverlayResourceLockList pending_overlay_resources_;
+  OverlayResourceLockList in_use_overlay_resources_;
+  OverlayResourceLockList previous_swap_overlay_resources_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeLayerRenderer);
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_NATIVE_LAYER_RENDERER_H_