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     OverlayCandidateValidator* capability_checker,
  15     ResourceProvider* resource_provider)
  16     : OverlayStrategyCommon(capability_checker, resource_provider) {
  17 }
  18
  19 bool OverlayStrategyUnderlay::Attempt(
  20     RenderPassList* render_passes_in_draw_order,
  21     OverlayCandidateList* candidate_list) {
  22   if (!capability_checker_)
  23     return false;
  24
  25   RenderPass* root_render_pass = render_passes_in_draw_order->back();
  26   DCHECK(root_render_pass);
  27
  28   OverlayCandidate candidate;
  29   QuadList& quad_list = root_render_pass->quad_list;
  30   auto candidate_iterator = quad_list.end();
  31   for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
  32     if (IsOverlayQuad(*it) && GetCandidateQuadInfo(**it, &candidate)) {
  33       candidate_iterator = it;
  34       break;
  35     }
  36   }
  37   if (candidate_iterator == quad_list.end())
  38     return false;
  39
  40   // Add our primary surface.
  41   OverlayCandidateList candidates;
  42   OverlayCandidate main_image;
  43   main_image.display_rect = root_render_pass->output_rect;
  44   candidates.push_back(main_image);
  45
  46   // Add the overlay.
  47   candidate.plane_z_order = -1;
  48   candidates.push_back(candidate);
  49
  50   // Check for support.
  51   capability_checker_->CheckOverlaySupport(&candidates);
  52
  53   // If the candidate can be handled by an overlay, create a pass for it. We
  54   // need to switch out the video quad with a black transparent one.
  55   if (candidates[1].overlay_handled) {
  56     const SharedQuadState* shared_quad_state =
  57         candidate_iterator->shared_quad_state;
  58     gfx::Rect rect = candidate_iterator->visible_rect;
  59     SolidColorDrawQuad* replacement =
  60         quad_list.ReplaceExistingElement<SolidColorDrawQuad>(
  61             candidate_iterator);
  62     replacement->SetAll(shared_quad_state, rect, rect, rect, false,
  63                         SK_ColorTRANSPARENT, true);
  64     candidate_list->swap(candidates);
  65     return true;
  66   }
  67   return false;
  68 }
  69
  70 }  // namespace cc