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