compositor/DrmKmsPlan.cpp

/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "hwc-composition-drm-kms-plan"

#include "DrmKmsPlan.h"

#include "drm/DrmDevice.h"
#include "drm/DrmPlane.h"
#include "utils/log.h"

namespace android {
auto DrmKmsPlan::CreateDrmKmsPlan(DrmDisplayPipeline &pipe,
                                  std::vector<DrmHwcLayer> composition)
    -> std::unique_ptr<DrmKmsPlan> {
  auto plan = std::make_unique<DrmKmsPlan>();

  auto avail_planes = pipe.GetUsablePlanes();

  int z_pos = 0;
  for (auto &dhl : composition) {
    std::shared_ptr<BindingOwner<DrmPlane>> plane;

    /* Skip unsupported planes */
    do {
      if (avail_planes.empty()) {
        return {};
      }

      plane = *avail_planes.begin();
      avail_planes.erase(avail_planes.begin());
    } while (!plane->Get()->IsValidForLayer(&dhl));

    LayerToPlaneJoining joining = {
        .layer = std::move(dhl),
        .plane = plane,
        .z_pos = z_pos++,
    };

    plan->plan.emplace_back(std::move(joining));
  }

  return plan;
}

}  // namespace android