cc/output/overlay_strategy_all_or_nothing.cc

// Copyright 2015 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_all_or_nothing.h"

#include "cc/output/overlay_candidate_validator.h"
#include "cc/quads/draw_quad.h"

namespace cc {

OverlayStrategyAllOrNothing::OverlayStrategyAllOrNothing(
    OverlayCandidateValidator* capability_checker)
    : capability_checker_(capability_checker) {
  DCHECK(capability_checker);
}

OverlayStrategyAllOrNothing::~OverlayStrategyAllOrNothing() {}

bool OverlayStrategyAllOrNothing::Attempt(ResourceProvider* resource_provider,
                                          RenderPassList* render_passes,
                                          OverlayCandidateList* candidates,
                                          gfx::Rect* damage_rect) {
  QuadList& quad_list = render_passes->back()->quad_list;
  OverlayCandidateList new_candidates;
  int next_z_order = -1;

  for (const DrawQuad* quad : quad_list) {
    OverlayCandidate candidate;
    if (!OverlayCandidate::FromDrawQuad(resource_provider, quad, &candidate))
      return false;
    candidate.plane_z_order = next_z_order--;
    new_candidates.push_back(candidate);
  }

  capability_checker_->CheckOverlaySupport(&new_candidates);
  for (const OverlayCandidate& candidate : new_candidates) {
    if (!candidate.overlay_handled)
      return false;
  }

  quad_list.clear();
  candidates->swap(new_candidates);
  return true;
}

}  // namespace cc