Refactor OverlayStrategySandwich and OverlayStrategyCommon

cc/output/overlay_strategy_common.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_OVERLAY_STRATEGY_COMMON_H_
-#define CC_OUTPUT_OVERLAY_STRATEGY_COMMON_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/output/overlay_candidate.h"
-#include "cc/output/overlay_processor.h"
-
-namespace cc {
-class IOSurfaceDrawQuad;
-class OverlayCandidate;
-class OverlayCandidateValidator;
-class StreamVideoDrawQuad;
-class TextureDrawQuad;
-
-enum OverlayResult {
-  DID_NOT_CREATE_OVERLAY,
-  CREATED_OVERLAY_STOP_LOOKING,
-  CREATED_OVERLAY_KEEP_LOOKING,
-};
-
-class CC_EXPORT OverlayStrategyCommonDelegate {
- public:
-  virtual ~OverlayStrategyCommonDelegate() {}
-
-  // Check if |candidate| can be promoted into an overlay. If so, add it to
-  // |candidate_list| and update the quads in |render_passes_in_draw_order|
-  // as necessary. When returning CREATED_OVERLAY_KEEP_LOOKING, |iter| is
-  // updated to point to the next quad to evaluate.
-  virtual OverlayResult TryOverlay(
-      OverlayCandidateValidator* capability_checker,
-      RenderPassList* render_passes_in_draw_order,
-      OverlayCandidateList* candidate_list,
-      const OverlayCandidate& candidate,
-      QuadList::Iterator* iter,
-      float device_scale_factor) = 0;
-};
-
-class CC_EXPORT OverlayStrategyCommon : public OverlayProcessor::Strategy {
- public:
-  explicit OverlayStrategyCommon(OverlayCandidateValidator* capability_checker,
-                                 OverlayStrategyCommonDelegate* delegate);
-  ~OverlayStrategyCommon() override;
-
-  bool Attempt(RenderPassList* render_passes_in_draw_order,
-               OverlayCandidateList* candidate_list,
-               float device_scale_factor) override;
-
-  // Returns true if |draw_quad| will not block quads underneath from becoming
-  // an overlay.
-  static bool IsInvisibleQuad(const DrawQuad* draw_quad);
-
- private:
-  OverlayCandidateValidator* capability_checker_;
-  scoped_ptr<OverlayStrategyCommonDelegate> delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverlayStrategyCommon);
-};
-}  // namespace cc
-
-#endif  // CC_OUTPUT_OVERLAY_STRATEGY_COMMON_H_