compositor/Planner.cpp

/*
 * Copyright (C) 2016 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-platform"

#include "Planner.h"

#include <algorithm>

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

namespace android {

std::vector<DrmPlane *> Planner::GetUsablePlanes(
    DrmCrtc *crtc, std::vector<DrmPlane *> *primary_planes,
    std::vector<DrmPlane *> *overlay_planes) {
  std::vector<DrmPlane *> usable_planes;
  std::copy_if(primary_planes->begin(), primary_planes->end(),
               std::back_inserter(usable_planes),
               [=](DrmPlane *plane) { return plane->GetCrtcSupported(*crtc); });
  std::copy_if(overlay_planes->begin(), overlay_planes->end(),
               std::back_inserter(usable_planes),
               [=](DrmPlane *plane) { return plane->GetCrtcSupported(*crtc); });
  return usable_planes;
}

std::tuple<int, std::vector<DrmCompositionPlane>> Planner::ProvisionPlanes(
    std::map<size_t, DrmHwcLayer *> &layers, DrmCrtc *crtc,
    std::vector<DrmPlane *> *primary_planes,
    std::vector<DrmPlane *> *overlay_planes) {
  std::vector<DrmCompositionPlane> composition;
  std::vector<DrmPlane *> planes = GetUsablePlanes(crtc, primary_planes,
                                                   overlay_planes);
  if (planes.empty()) {
    ALOGE("Display %d has no usable planes", crtc->display());
    return std::make_tuple(-ENODEV, std::vector<DrmCompositionPlane>());
  }

  // Go through the provisioning stages and provision planes
  int ret = ProvisionPlanesInternal(&composition, layers, &planes);
  if (ret != 0) {
    ALOGV("Failed provision stage with ret %d", ret);
    return std::make_tuple(ret, std::vector<DrmCompositionPlane>());
  }

  return std::make_tuple(0, std::move(composition));
}

int Planner::ProvisionPlanesInternal(
    std::vector<DrmCompositionPlane> *composition,
    std::map<size_t, DrmHwcLayer *> &layers, std::vector<DrmPlane *> *planes) {
  // Fill up the remaining planes
  for (auto i = layers.begin(); i != layers.end(); i = layers.erase(i)) {
    int ret = Emplace(composition, planes, std::make_pair(i->first, i->second));
    // We don't have any planes left
    if (ret == -ENOENT)
      break;

    if (ret != 0) {
      ALOGV("Failed to emplace layer %zu, dropping it", i->first);
      return ret;
    }
  }

  return 0;
}
}  // namespace android