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/base/math_util.h"
  10 #include "cc/output/overlay_candidate_validator.h"
  11 #include "cc/quads/draw_quad.h"
  12
  13 namespace cc {
  14
  15 OverlayStrategySingleOnTop::~OverlayStrategySingleOnTop() {}
  16
  17 OverlayResult OverlayStrategySingleOnTop::TryOverlay(
  18     OverlayCandidateValidator* capability_checker,
  19     RenderPassList* render_passes_in_draw_order,
  20     OverlayCandidateList* candidate_list,
  21     const OverlayCandidate& candidate,
  22     QuadList::Iterator* candidate_iterator,
  23     float device_scale_factor) {
  24   RenderPass* root_render_pass = render_passes_in_draw_order->back();
  25   QuadList& quad_list = root_render_pass->quad_list;
  26   // Check that no prior quads overlap it.
  27   for (auto overlap_iter = quad_list.cbegin();
  28        overlap_iter != *candidate_iterator; ++overlap_iter) {
  29     gfx::RectF overlap_rect = MathUtil::MapClippedRect(
  30         overlap_iter->shared_quad_state->quad_to_target_transform,
  31         gfx::RectF(overlap_iter->rect));
  32     if (candidate.display_rect.Intersects(overlap_rect) &&
  33         !OverlayStrategyCommon::IsInvisibleQuad(*overlap_iter))
  34       return DID_NOT_CREATE_OVERLAY;
  35   }
  36
  37   // Add the overlay.
  38   OverlayCandidateList new_candidate_list = *candidate_list;
  39   new_candidate_list.push_back(candidate);
  40   new_candidate_list.back().plane_z_order = 1;
  41
  42   // Check for support.
  43   capability_checker->CheckOverlaySupport(&new_candidate_list);
  44
  45   // If the candidate can be handled by an overlay, create a pass for it.
  46   if (new_candidate_list.back().overlay_handled) {
  47     quad_list.EraseAndInvalidateAllPointers(*candidate_iterator);
  48     candidate_list->swap(new_candidate_list);
  49     return CREATED_OVERLAY_STOP_LOOKING;
  50   }
  51
  52   return DID_NOT_CREATE_OVERLAY;
  53 }
  54
  55 }  // namespace cc