| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/output/overlay_strategy_single_on_top.h" |
| |
| #include "cc/base/math_util.h" |
| #include "cc/output/overlay_candidate_validator.h" |
| #include "cc/quads/draw_quad.h" |
| #include "ui/gfx/geometry/rect_conversions.h" |
| |
| namespace cc { |
| |
| OverlayStrategySingleOnTop::OverlayStrategySingleOnTop( |
| OverlayCandidateValidator* capability_checker) |
| : capability_checker_(capability_checker) { |
| DCHECK(capability_checker); |
| } |
| |
| OverlayStrategySingleOnTop::~OverlayStrategySingleOnTop() {} |
| |
| bool OverlayStrategySingleOnTop::Attempt(ResourceProvider* resource_provider, |
| RenderPass* render_pass, |
| OverlayCandidateList* candidate_list) { |
| QuadList* quad_list = &render_pass->quad_list; |
| for (auto it = quad_list->begin(); it != quad_list->end(); ++it) { |
| OverlayCandidate candidate; |
| if (OverlayCandidate::FromDrawQuad(resource_provider, *it, &candidate) && |
| TryOverlay(quad_list, candidate_list, candidate, it)) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool OverlayStrategySingleOnTop::TryOverlay( |
| QuadList* quad_list, |
| OverlayCandidateList* candidate_list, |
| const OverlayCandidate& candidate, |
| QuadList::Iterator candidate_iterator) { |
| // Check that no prior quads overlap it. |
| if (OverlayCandidate::IsOccluded(candidate, quad_list->cbegin(), |
| candidate_iterator)) |
| return false; |
| |
| // Add the overlay. |
| OverlayCandidateList new_candidate_list = *candidate_list; |
| new_candidate_list.push_back(candidate); |
| new_candidate_list.back().plane_z_order = 1; |
| |
| // Check for support. |
| capability_checker_->CheckOverlaySupport(&new_candidate_list); |
| |
| const OverlayCandidate& overlay_candidate = new_candidate_list.back(); |
| // If the candidate can be handled by an overlay, create a pass for it. |
| if (overlay_candidate.overlay_handled) { |
| quad_list->EraseAndInvalidateAllPointers(candidate_iterator); |
| candidate_list->swap(new_candidate_list); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| } // namespace cc |