image_8u.h

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/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * 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.
 *****************************************************************************/
#pragma once
 
#include <map>
#include <memory>
 
#include "modules/perception/common/base/blob.h"
#include "modules/perception/common/base/box.h"
 
namespace apollo {
namespace perception {
namespace base {
 
enum class Color {
  NONE = 0x00,
  GRAY = 0x01,
  RGB = 0x02,
  BGR = 0x03,
};
 
const std::map<Color, int> kChannelsMap{
    {Color::GRAY, 1}, {Color::RGB, 3}, {Color::BGR, 3}};
 
class Image8U {
 public:
  Image8U()
      : rows_(0),
        cols_(0),
        type_(Color::NONE),
        channels_(0),
        width_step_(0),
        blob_(nullptr),
        offset_(0) {}
 
  Image8U(int rows, int cols, Color type, std::shared_ptr<Blob<uint8_t>> blob,
          int offset = 0)
      : rows_(rows), cols_(cols), type_(type), blob_(blob), offset_(offset) {
    channels_ = kChannelsMap.at(type);
    CHECK_EQ(blob_->num_axes(), 3);
    CHECK_EQ(blob_->shape(2), channels_);
    CHECK_LE(offset_ + blob_->offset({rows - 1, cols - 1, channels_ - 1}),
             (int)(blob_->count()));
    width_step_ = blob_->offset({1, 0, 0}) * static_cast<int>(sizeof(uint8_t));
  }
 
  Image8U(int rows, int cols, Color type)
      : rows_(rows), cols_(cols), type_(type), offset_(0) {
    channels_ = kChannelsMap.at(type);
    blob_.reset(new Blob<uint8_t>({rows_, cols_, channels_}));
    width_step_ = blob_->offset({1, 0, 0}) * static_cast<int>(sizeof(uint8_t));
  }
 
  Image8U(const Image8U &src)
      : rows_(src.rows_),
        cols_(src.cols_),
        type_(src.type_),
        channels_(src.channels_),
        width_step_(src.width_step_),
        blob_(src.blob_),
        offset_(src.offset_) {}
 
  Image8U &operator=(const Image8U &src) {
    this->rows_ = src.rows_;
    this->cols_ = src.cols_;
    this->type_ = src.type_;
    this->channels_ = src.channels_;
    this->width_step_ = src.width_step_;
    this->blob_ = src.blob_;
    this->offset_ = src.offset_;
    return *this;
  }
 
  ~Image8U() {}
 
  uint8_t *mutable_cpu_data() { return mutable_cpu_ptr(0); }
 
  uint8_t *mutable_gpu_data() { return mutable_gpu_ptr(0); }
 
  const uint8_t *cpu_data() const { return cpu_ptr(0); }
 
  const uint8_t *gpu_data() const { return gpu_ptr(0); }
 
  const uint8_t *cpu_ptr(int row = 0) const {
    return blob_->cpu_data() + blob_->offset({row, 0, 0}) + offset_;
  }
 
  const uint8_t *gpu_ptr(int row = 0) const {
    return blob_->gpu_data() + blob_->offset({row, 0, 0}) + offset_;
  }
 
  uint8_t *mutable_cpu_ptr(int row = 0) {
    return blob_->mutable_cpu_data() + blob_->offset({row, 0, 0}) + offset_;
  }
 
  uint8_t *mutable_gpu_ptr(int row = 0) {
    return blob_->mutable_gpu_data() + blob_->offset({row, 0, 0}) + offset_;
  }
 
  Color type() const { return type_; }
  int rows() const { return rows_; }
  int cols() const { return cols_; }
  int channels() const { return channels_; }
  int width_step() const { return width_step_; }
  // @brief: returns the total number of pixels.
  int total() const { return rows_ * cols_ * channels_; }
 
  Image8U operator()(const Rect<int> &roi) const {
    int offset = offset_ + blob_->offset({roi.y, roi.x, 0});
    // return Image8U(roi.height, roi.width, type_, blob_, offset);
    return Image8U(roi.height, roi.width, type_, blob_, offset);
  }
 
  std::shared_ptr<Blob<uint8_t>> blob() { return blob_; }
 
  // DONOT return `std::shared_ptr<const Blob<uint8_t>> &` or `const std::... &`
  std::shared_ptr<const Blob<uint8_t>> blob() const { return blob_; }
 
 protected:
  int rows_;
  int cols_;
  Color type_;
  int channels_;
  int width_step_;
  std::shared_ptr<Blob<uint8_t>> blob_;
  int offset_;
};  // class Image8U
 
typedef std::shared_ptr<Image8U> Image8UPtr;
typedef std::shared_ptr<const Image8U> Image8UConstPtr;
 
}  // namespace base
}  // namespace perception
}  // namespace apollo