| // 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 <limits> |
| |
| #include "cc/output/overlay_candidate_validator.h" |
| #include "cc/quads/draw_quad.h" |
| |
| namespace cc { |
| |
| OverlayStrategySingleOnTop::OverlayStrategySingleOnTop( |
| OverlayCandidateValidator* capability_checker, |
| ResourceProvider* resource_provider) |
| : OverlayStrategyCommon(capability_checker, resource_provider) { |
| } |
| |
| bool OverlayStrategySingleOnTop::Attempt( |
| RenderPassList* render_passes_in_draw_order, |
| OverlayCandidateList* candidate_list) { |
| // Only attempt to handle very simple case for now. |
| if (!capability_checker_) |
| return false; |
| |
| RenderPass* root_render_pass = render_passes_in_draw_order->back(); |
| DCHECK(root_render_pass); |
| |
| OverlayCandidate candidate; |
| QuadList& quad_list = root_render_pass->quad_list; |
| auto candidate_iterator = quad_list.end(); |
| for (auto it = quad_list.begin(); it != quad_list.end(); ++it) { |
| const DrawQuad* draw_quad = *it; |
| if (IsOverlayQuad(draw_quad)) { |
| // Check that no prior quads overlap it. |
| bool intersects = false; |
| gfx::RectF rect = draw_quad->rect; |
| draw_quad->quadTransform().TransformRect(&rect); |
| for (auto overlap_iter = quad_list.cbegin(); overlap_iter != it; |
| ++overlap_iter) { |
| gfx::RectF overlap_rect = overlap_iter->rect; |
| overlap_iter->quadTransform().TransformRect(&overlap_rect); |
| if (rect.Intersects(overlap_rect) && !IsInvisibleQuad(*overlap_iter)) { |
| intersects = true; |
| break; |
| } |
| } |
| if (intersects || !GetCandidateQuadInfo(*draw_quad, &candidate)) |
| continue; |
| candidate_iterator = it; |
| break; |
| } |
| } |
| if (candidate_iterator == quad_list.end()) |
| return false; |
| |
| // Add our primary surface. |
| OverlayCandidateList candidates; |
| OverlayCandidate main_image; |
| main_image.display_rect = root_render_pass->output_rect; |
| candidates.push_back(main_image); |
| |
| // Add the overlay. |
| candidate.plane_z_order = 1; |
| candidates.push_back(candidate); |
| |
| // Check for support. |
| capability_checker_->CheckOverlaySupport(&candidates); |
| |
| // If the candidate can be handled by an overlay, create a pass for it. |
| if (candidates[1].overlay_handled) { |
| quad_list.EraseAndInvalidateAllPointers(candidate_iterator); |
| candidate_list->swap(candidates); |
| return true; |
| } |
| return false; |
| } |
| |
| } // namespace cc |