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     OverlayCandidateValidator* capability_checker)
  16     : OverlayStrategyCommon(capability_checker) {
  17 }
  18
  19 bool OverlayStrategySingleOnTop::TryOverlay(
  20     OverlayCandidateValidator* capability_checker,
  21
  22     RenderPassList* render_passes_in_draw_order,
  23     OverlayCandidateList* candidate_list,
  24     const OverlayCandidate& candidate,
  25     QuadList::Iterator candidate_iterator) {
  26   RenderPass* root_render_pass = render_passes_in_draw_order->back();
  27   QuadList& quad_list = root_render_pass->quad_list;
  28   const DrawQuad* draw_quad = *candidate_iterator;
  29   gfx::RectF rect = draw_quad->rect;
  30   draw_quad->shared_quad_state->quad_to_target_transform.TransformRect(&rect);
  31
  32   // Check that no prior quads overlap it.
  33   for (auto overlap_iter = quad_list.cbegin();
  34        overlap_iter != candidate_iterator; ++overlap_iter) {
  35     gfx::RectF overlap_rect = overlap_iter->rect;
  36     overlap_iter->shared_quad_state->quad_to_target_transform.TransformRect(
  37         &overlap_rect);
  38     if (rect.Intersects(overlap_rect) && !IsInvisibleQuad(*overlap_iter))
  39       return false;
  40   }
  41
  42   // Add our primary surface.
  43   OverlayCandidateList candidates;
  44   OverlayCandidate main_image;
  45   main_image.display_rect = root_render_pass->output_rect;
  46   candidates.push_back(main_image);
  47
  48   // Add the overlay.
  49   candidates.push_back(candidate);
  50   candidates.back().plane_z_order = 1;
  51
  52   // Check for support.
  53   capability_checker->CheckOverlaySupport(&candidates);
  54
  55   // If the candidate can be handled by an overlay, create a pass for it.
  56   if (candidates[1].overlay_handled) {
  57     quad_list.EraseAndInvalidateAllPointers(candidate_iterator);
  58     candidate_list->swap(candidates);
  59     return true;
  60   }
  61   return false;
  62 }
  63
  64 }  // namespace cc