cc/output/overlay_strategy_underlay.h

   1 // Copyright 2014 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_UNDERLAY_H_
   6 #define CC_OUTPUT_OVERLAY_STRATEGY_UNDERLAY_H_
   7
   8 #include "cc/output/overlay_strategy_common.h"
   9
  10 namespace cc {
  11 class StreamVideoDrawQuad;
  12 class TextureDrawQuad;
  13
  14 // The underlay strategy looks for a video quad without regard to quads above
  15 // it. The video is "underlaid" through a black transparent quad substituted
  16 // for the video quad. The overlay content can then be blended in by the
  17 // hardware under the the scene. This is only valid for overlay contents that
  18 // are fully opaque.
  19 class CC_EXPORT OverlayStrategyUnderlay : public OverlayStrategyCommon {
  20  public:
  21   OverlayStrategyUnderlay(OverlayCandidateValidator* capability_checker,
  22                           ResourceProvider* resource_provider);
  23   bool Attempt(RenderPassList* render_passes_in_draw_order,
  24                OverlayCandidateList* candidate_list) override;
  25
  26  private:
  27   DISALLOW_COPY_AND_ASSIGN(OverlayStrategyUnderlay);
  28 };
  29
  30 }  // namespace cc
  31
  32 #endif  // CC_OUTPUT_OVERLAY_STRATEGY_UNDERLAY_H_