cc/output/overlay_strategy_single_on_top.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_single_on_top.h"
   6
   7 #include <limits>
   8
   9 #include "cc/output/overlay_candidate_validator.h"
  10 #include "cc/quads/draw_quad.h"
  11
  12 namespace cc {
  13
  14 OverlayStrategySingleOnTop::~OverlayStrategySingleOnTop() {}
  15
  16 bool OverlayStrategySingleOnTop::TryOverlay(
  17     OverlayCandidateValidator* capability_checker,
  18     RenderPassList* render_passes_in_draw_order,
  19     OverlayCandidateList* candidate_list,
  20     const OverlayCandidate& candidate,
  21     QuadList::Iterator candidate_iterator,
  22     float device_scale_factor) {
  23   RenderPass* root_render_pass = render_passes_in_draw_order->back();
  24   QuadList& quad_list = root_render_pass->quad_list;
  25   const DrawQuad* draw_quad = *candidate_iterator;
  26   gfx::RectF rect = draw_quad->rect;
  27   draw_quad->shared_quad_state->quad_to_target_transform.TransformRect(&rect);
  28
  29   // Check that no prior quads overlap it.
  30   for (auto overlap_iter = quad_list.cbegin();
  31        overlap_iter != candidate_iterator; ++overlap_iter) {
  32     gfx::RectF overlap_rect = overlap_iter->rect;
  33     overlap_iter->shared_quad_state->quad_to_target_transform.TransformRect(
  34         &overlap_rect);
  35     if (rect.Intersects(overlap_rect) &&
  36         !OverlayStrategyCommon::IsInvisibleQuad(*overlap_iter))
  37       return false;
  38   }
  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   candidates.push_back(candidate);
  48   candidates.back().plane_z_order = 1;
  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.
  54   if (candidates[1].overlay_handled) {
  55     quad_list.EraseAndInvalidateAllPointers(candidate_iterator);
  56     candidate_list->swap(candidates);
  57     return true;
  58   }
  59   return false;
  60 }
  61
  62 }  // namespace cc