cc/output/overlay_strategy_underlay.cc

   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 #include "cc/output/overlay_strategy_underlay.h"
   6
   7 #include "cc/output/overlay_candidate_validator.h"
   8 #include "cc/quads/draw_quad.h"
   9 #include "cc/quads/solid_color_draw_quad.h"
  10
  11 namespace cc {
  12
  13 OverlayStrategyUnderlay::~OverlayStrategyUnderlay() {}
  14
  15 OverlayResult OverlayStrategyUnderlay::TryOverlay(
  16     OverlayCandidateValidator* capability_checker,
  17     RenderPassList* render_passes_in_draw_order,
  18     OverlayCandidateList* candidate_list,
  19     const OverlayCandidate& candidate,
  20     QuadList::Iterator* candidate_iterator,
  21     float device_scale_factor) {
  22   RenderPass* root_render_pass = render_passes_in_draw_order->back();
  23   QuadList& quad_list = root_render_pass->quad_list;
  24
  25   // Add the overlay.
  26   OverlayCandidateList new_candidate_list = *candidate_list;
  27   new_candidate_list.push_back(candidate);
  28   new_candidate_list.back().plane_z_order = -1;
  29
  30   // Check for support.
  31   capability_checker->CheckOverlaySupport(&new_candidate_list);
  32
  33   // If the candidate can be handled by an overlay, create a pass for it. We
  34   // need to switch out the video quad with a black transparent one.
  35   if (new_candidate_list.back().overlay_handled) {
  36     const SharedQuadState* shared_quad_state =
  37         (*candidate_iterator)->shared_quad_state;
  38     gfx::Rect rect = (*candidate_iterator)->visible_rect;
  39     SolidColorDrawQuad* replacement =
  40         quad_list.ReplaceExistingElement<SolidColorDrawQuad>(
  41             *candidate_iterator);
  42     replacement->SetAll(shared_quad_state, rect, rect, rect, false,
  43                         SK_ColorTRANSPARENT, true);
  44     candidate_list->swap(new_candidate_list);
  45     return CREATED_OVERLAY_STOP_LOOKING;
  46   }
  47
  48   return DID_NOT_CREATE_OVERLAY;
  49 }
  50
  51 }  // namespace cc