/*
 * Copyright (C) 2015 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-hisi"

#include "platformhisi.h"
#include "drmdevice.h"
#include "platform.h"

#include <stdatomic.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <cinttypes>

#include <hardware/gralloc.h>
#include <log/log.h>
#include "gralloc_priv.h"

#define MALI_ALIGN(value, base) (((value) + ((base)-1)) & ~((base)-1))

namespace android {

Importer *Importer::CreateInstance(DrmDevice *drm) {
  HisiImporter *importer = new HisiImporter(drm);
  if (!importer)
    return NULL;

  int ret = importer->Init();
  if (ret) {
    ALOGE("Failed to initialize the hisi importer %d", ret);
    delete importer;
    return NULL;
  }
  return importer;
}

#if defined(MALI_GRALLOC_INTFMT_AFBC_BASIC) && \
    defined(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16)
uint64_t HisiImporter::ConvertGrallocFormatToDrmModifiers(uint64_t flags,
                                                          bool is_rgb) {
  uint64_t features = 0UL;

  if (flags & MALI_GRALLOC_INTFMT_AFBC_BASIC)
    features |= AFBC_FORMAT_MOD_BLOCK_SIZE_16x16;

  if (flags & MALI_GRALLOC_INTFMT_AFBC_SPLITBLK)
    features |= (AFBC_FORMAT_MOD_SPLIT | AFBC_FORMAT_MOD_SPARSE);

  if (flags & MALI_GRALLOC_INTFMT_AFBC_WIDEBLK)
    features |= AFBC_FORMAT_MOD_BLOCK_SIZE_32x8;

  if (flags & MALI_GRALLOC_INTFMT_AFBC_TILED_HEADERS)
    features |= AFBC_FORMAT_MOD_TILED;

  if (features) {
    if (is_rgb)
      features |= AFBC_FORMAT_MOD_YTR;

    return DRM_FORMAT_MOD_ARM_AFBC(features);
  }

  return 0;
}
#else
uint64_t HisiImporter::ConvertGrallocFormatToDrmModifiers(uint64_t /* flags */,
                                                          bool /* is_rgb */) {
  return 0;
}
#endif

bool HisiImporter::IsDrmFormatRgb(uint32_t drm_format) {
  switch (drm_format) {
    case DRM_FORMAT_ARGB8888:
    case DRM_FORMAT_XBGR8888:
    case DRM_FORMAT_ABGR8888:
    case DRM_FORMAT_BGR888:
    case DRM_FORMAT_BGR565:
      return true;
    case DRM_FORMAT_YVU420:
      return false;
    default:
      ALOGV("Unsupported format %u assuming rgb?", drm_format);
      return true;
  }
}

int HisiImporter::ConvertBoInfo(buffer_handle_t handle, hwc_drm_bo_t *bo) {
  bool is_rgb;

  private_handle_t const *hnd = reinterpret_cast<private_handle_t const *>(
      handle);
  if (!hnd)
    return -EINVAL;

  if (!(hnd->usage & GRALLOC_USAGE_HW_FB))
    return -EINVAL;

  uint32_t fmt = ConvertHalFormatToDrm(hnd->req_format);
  if (fmt == DRM_FORMAT_INVALID)
    return -EINVAL;

  is_rgb = HisiImporter::IsDrmFormatRgb(fmt);
  bo->modifiers[0] = HisiImporter::
      ConvertGrallocFormatToDrmModifiers(hnd->internal_format, is_rgb);

  bo->width = hnd->width;
  bo->height = hnd->height;
  bo->hal_format = hnd->req_format;
  bo->format = fmt;
  bo->usage = hnd->usage;
  bo->pixel_stride = hnd->stride;
  bo->pitches[0] = hnd->byte_stride;
  bo->prime_fds[0] = hnd->share_fd;
  bo->offsets[0] = 0;

  switch (fmt) {
    case DRM_FORMAT_YVU420: {
      int align = 128;
      if (hnd->usage &
          (GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK))
        align = 16;
      int adjusted_height = MALI_ALIGN(hnd->height, 2);
      int y_size = adjusted_height * hnd->byte_stride;
      int vu_stride = MALI_ALIGN(hnd->byte_stride / 2, align);
      int v_size = vu_stride * (adjusted_height / 2);

      /* V plane*/
      bo->prime_fds[1] = hnd->share_fd;
      bo->pitches[1] = vu_stride;
      bo->offsets[1] = y_size;
      /* U plane */
      bo->prime_fds[2] = hnd->share_fd;
      bo->pitches[2] = vu_stride;
      bo->offsets[2] = y_size + v_size;
      break;
    }
    default:
      break;
  }

  bo->with_modifiers = true;

  return 0;
}

class PlanStageHiSi : public Planner::PlanStage {
 public:
  int ProvisionPlanes(std::vector<DrmCompositionPlane> *composition,
                      std::map<size_t, DrmHwcLayer *> &layers, DrmCrtc *crtc,
                      std::vector<DrmPlane *> *planes) {
    int layers_added = 0;
    // Fill up as many DRM planes as we can with buffers that have HW_FB usage.
    // Buffers without HW_FB should have been filtered out with
    // CanImportBuffer(), if we meet one here, just skip it.
    for (auto i = layers.begin(); i != layers.end(); i = layers.erase(i)) {
      if (!(i->second->gralloc_buffer_usage & GRALLOC_USAGE_HW_FB))
        continue;

      int ret = Emplace(composition, planes, DrmCompositionPlane::Type::kLayer,
                        crtc, std::make_pair(i->first, i->second));
      layers_added++;
      // We don't have any planes left
      if (ret == -ENOENT)
        break;
      else if (ret) {
        ALOGE("Failed to emplace layer %zu, dropping it", i->first);
        return ret;
      }
    }
    // If we didn't emplace anything, return an error to ensure we force client
    // compositing.
    if (!layers_added)
      return -EINVAL;

    return 0;
  }
};

std::unique_ptr<Planner> Planner::CreateInstance(DrmDevice *) {
  std::unique_ptr<Planner> planner(new Planner);
  planner->AddStage<PlanStageHiSi>();
  return planner;
}
}  // namespace android