cc/output/overlay_strategy_common.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_OUTPUT_OVERLAY_STRATEGY_COMMON_H_
   6 #define CC_OUTPUT_OVERLAY_STRATEGY_COMMON_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/output/overlay_candidate.h"
  10 #include "cc/output/overlay_processor.h"
  11
  12 namespace cc {
  13 class IOSurfaceDrawQuad;
  14 class OverlayCandidate;
  15 class OverlayCandidateValidator;
  16 class StreamVideoDrawQuad;
  17 class TextureDrawQuad;
  18
  19 enum OverlayResult {
  20   DID_NOT_CREATE_OVERLAY,
  21   CREATED_OVERLAY_STOP_LOOKING,
  22   CREATED_OVERLAY_KEEP_LOOKING,
  23 };
  24
  25 class CC_EXPORT OverlayStrategyCommonDelegate {
  26  public:
  27   virtual ~OverlayStrategyCommonDelegate() {}
  28
  29   // Check if |candidate| can be promoted into an overlay. If so, add it to
  30   // |candidate_list| and update the quads in |render_passes_in_draw_order|
  31   // as necessary. When returning CREATED_OVERLAY_KEEP_LOOKING, |iter| is
  32   // updated to point to the next quad to evaluate.
  33   virtual OverlayResult TryOverlay(
  34       OverlayCandidateValidator* capability_checker,
  35       RenderPassList* render_passes_in_draw_order,
  36       OverlayCandidateList* candidate_list,
  37       const OverlayCandidate& candidate,
  38       QuadList::Iterator* iter,
  39       float device_scale_factor) = 0;
  40 };
  41
  42 class CC_EXPORT OverlayStrategyCommon : public OverlayProcessor::Strategy {
  43  public:
  44   explicit OverlayStrategyCommon(OverlayCandidateValidator* capability_checker,
  45                                  OverlayStrategyCommonDelegate* delegate);
  46   ~OverlayStrategyCommon() override;
  47
  48   bool Attempt(RenderPassList* render_passes_in_draw_order,
  49                OverlayCandidateList* candidate_list,
  50                float device_scale_factor) override;
  51
  52   // Returns true if |draw_quad| will not block quads underneath from becoming
  53   // an overlay.
  54   static bool IsInvisibleQuad(const DrawQuad* draw_quad);
  55
  56  protected:
  57   // Returns true if |draw_quad| is of a known quad type and contains an
  58   // overlayable resource.
  59   bool GetCandidateQuadInfo(const DrawQuad& draw_quad,
  60                             OverlayCandidate* quad_info);
  61   bool GetTextureQuadInfo(const TextureDrawQuad& quad,
  62                           OverlayCandidate* quad_info);
  63   bool GetVideoQuadInfo(const StreamVideoDrawQuad& quad,
  64                         OverlayCandidate* quad_info);
  65   bool GetIOSurfaceQuadInfo(const IOSurfaceDrawQuad& quad,
  66                             OverlayCandidate* quad_info);
  67
  68  private:
  69   OverlayCandidateValidator* capability_checker_;
  70   scoped_ptr<OverlayStrategyCommonDelegate> delegate_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(OverlayStrategyCommon);
  73 };
  74 }  // namespace cc
  75
  76 #endif  // CC_OUTPUT_OVERLAY_STRATEGY_COMMON_H_