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// 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"
namespace cc {
OverlayStrategySingleOnTop::OverlayStrategySingleOnTop(
OverlayCandidateValidator* capability_checker)
: capability_checker_(capability_checker) {
DCHECK(capability_checker);
}
OverlayStrategySingleOnTop::~OverlayStrategySingleOnTop() {}
bool OverlayStrategySingleOnTop::Attempt(ResourceProvider* resource_provider,
RenderPassList* render_passes,
OverlayCandidateList* candidate_list) {
QuadList* quad_list = &render_passes->back()->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.
for (auto overlap_iter = quad_list->cbegin();
overlap_iter != candidate_iterator; ++overlap_iter) {
gfx::RectF overlap_rect = MathUtil::MapClippedRect(
overlap_iter->shared_quad_state->quad_to_target_transform,
gfx::RectF(overlap_iter->rect));
if (candidate.display_rect.Intersects(overlap_rect) &&
!OverlayCandidate::IsInvisibleQuad(*overlap_iter))
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);
// If the candidate can be handled by an overlay, create a pass for it.
if (new_candidate_list.back().overlay_handled) {
quad_list->EraseAndInvalidateAllPointers(candidate_iterator);
candidate_list->swap(new_candidate_list);
return true;
}
return false;
}
} // namespace cc
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