hwcutils.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 ATRACE_TAG ATRACE_TAG_GRAPHICS
#define LOG_TAG "hwc-drm-utils"

#include "drmhwcomposer.h"
#include "platform.h"

#include <cutils/log.h>

namespace android {

const hwc_drm_bo *DrmHwcBuffer::operator->() const {
  if (importer_ == NULL) {
    ALOGE("Access of non-existent BO");
    exit(1);
    return NULL;
  }
  return &bo_;
}

void DrmHwcBuffer::Clear() {
  if (importer_ != NULL) {
    importer_->ReleaseBuffer(&bo_);
    importer_ = NULL;
  }
}

int DrmHwcBuffer::ImportBuffer(buffer_handle_t handle, Importer *importer) {
  hwc_drm_bo tmp_bo;

  int ret = importer->ImportBuffer(handle, &tmp_bo);
  if (ret)
    return ret;

  if (importer_ != NULL) {
    importer_->ReleaseBuffer(&bo_);
  }

  importer_ = importer;

  bo_ = tmp_bo;

  return 0;
}

static native_handle_t *dup_buffer_handle(buffer_handle_t handle) {
  native_handle_t *new_handle =
      native_handle_create(handle->numFds, handle->numInts);
  if (new_handle == NULL)
    return NULL;

  const int *old_data = handle->data;
  int *new_data = new_handle->data;
  for (int i = 0; i < handle->numFds; i++) {
    *new_data = dup(*old_data);
    old_data++;
    new_data++;
  }
  memcpy(new_data, old_data, sizeof(int) * handle->numInts);

  return new_handle;
}

static void free_buffer_handle(native_handle_t *handle) {
  int ret = native_handle_close(handle);
  if (ret)
    ALOGE("Failed to close native handle %d", ret);
  ret = native_handle_delete(handle);
  if (ret)
    ALOGE("Failed to delete native handle %d", ret);
}

int DrmHwcNativeHandle::CopyBufferHandle(buffer_handle_t handle,
                                         const gralloc_module_t *gralloc) {
  native_handle_t *handle_copy = dup_buffer_handle(handle);
  if (handle_copy == NULL) {
    ALOGE("Failed to duplicate handle");
    return -ENOMEM;
  }

  int ret = gralloc->registerBuffer(gralloc, handle_copy);
  if (ret) {
    ALOGE("Failed to register buffer handle %d", ret);
    free_buffer_handle(handle_copy);
    return ret;
  }

  Clear();

  gralloc_ = gralloc;
  handle_ = handle_copy;

  return 0;
}

DrmHwcNativeHandle::~DrmHwcNativeHandle() {
  Clear();
}

void DrmHwcNativeHandle::Clear() {
  if (gralloc_ != NULL && handle_ != NULL) {
    gralloc_->unregisterBuffer(gralloc_, handle_);
    free_buffer_handle(handle_);
    gralloc_ = NULL;
    handle_ = NULL;
  }
}

int DrmHwcLayer::InitFromHwcLayer(hwc_layer_1_t *sf_layer, Importer *importer,
                                  const gralloc_module_t *gralloc) {
  alpha = sf_layer->planeAlpha;

  SetSourceCrop(sf_layer->sourceCropf);
  SetDisplayFrame(sf_layer->displayFrame);
  SetTransform(sf_layer->transform);

  switch (sf_layer->blending) {
    case HWC_BLENDING_NONE:
      blending = DrmHwcBlending::kNone;
      break;
    case HWC_BLENDING_PREMULT:
      blending = DrmHwcBlending::kPreMult;
      break;
    case HWC_BLENDING_COVERAGE:
      blending = DrmHwcBlending::kCoverage;
      break;
    default:
      ALOGE("Invalid blending in hwc_layer_1_t %d", sf_layer->blending);
      return -EINVAL;
  }

  sf_handle = sf_layer->handle;

  return ImportBuffer(importer, gralloc);
}

int DrmHwcLayer::ImportBuffer(Importer *importer,
                              const gralloc_module_t *gralloc) {
  int ret = buffer.ImportBuffer(sf_handle, importer);
  if (ret)
    return ret;

  ret = handle.CopyBufferHandle(sf_handle, gralloc);
  if (ret)
    return ret;

  ret = gralloc->perform(gralloc, GRALLOC_MODULE_PERFORM_GET_USAGE,
                         handle.get(), &gralloc_buffer_usage);
  if (ret) {
    ALOGE("Failed to get usage for buffer %p (%d)", handle.get(), ret);
    return ret;
  }
  return 0;
}

void DrmHwcLayer::SetSourceCrop(hwc_frect_t const &crop) {
  source_crop = DrmHwcRect<float>(crop.left, crop.top, crop.right, crop.bottom);
}

void DrmHwcLayer::SetDisplayFrame(hwc_rect_t const &frame) {
  display_frame =
      DrmHwcRect<int>(frame.left, frame.top, frame.right, frame.bottom);
}

void DrmHwcLayer::SetTransform(int32_t sf_transform) {
  transform = 0;
  // 270* and 180* cannot be combined with flips. More specifically, they
  // already contain both horizontal and vertical flips, so those fields are
  // redundant in this case. 90* rotation can be combined with either horizontal
  // flip or vertical flip, so treat it differently
  if (sf_transform == HWC_TRANSFORM_ROT_270) {
    transform = DrmHwcTransform::kRotate270;
  } else if (sf_transform == HWC_TRANSFORM_ROT_180) {
    transform = DrmHwcTransform::kRotate180;
  } else {
    if (sf_transform & HWC_TRANSFORM_FLIP_H)
      transform |= DrmHwcTransform::kFlipH;
    if (sf_transform & HWC_TRANSFORM_FLIP_V)
      transform |= DrmHwcTransform::kFlipV;
    if (sf_transform & HWC_TRANSFORM_ROT_90)
      transform |= DrmHwcTransform::kRotate90;
  }
}
}