text: // Copyright 2016 The Draco Authors.
  //
  // 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.
  //
  #ifndef DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_FLOAT_POINTS_TREE_DECODER_H_
  #define DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_FLOAT_POINTS_TREE_DECODER_H_
  
  #include <memory>
  
  #include "compression/point_cloud/algorithms/point_cloud_compression_method.h"
  #include "compression/point_cloud/algorithms/point_cloud_types.h"
  #include "compression/point_cloud/algorithms/quantize_points_3.h"
  #include "core/decoder_buffer.h"
  
  namespace draco {
  
  // Decodes a point cloud encoded by PointCloudTreeEncoder.
  class FloatPointsTreeDecoder {
   public:
    FloatPointsTreeDecoder();
  
    // Decodes a point cloud from |buffer|.
    template <class OutputIteratorT>
    bool DecodePointCloud(DecoderBuffer *buffer, OutputIteratorT out);
    // Initializes a DecoderBuffer from |data|, and calls function above.
    template <class OutputIteratorT>
    bool DecodePointCloud(const char *data, size_t data_size,
                          OutputIteratorT out) {
      if (data == 0 || data_size <= 0)
        return false;
  
      DecoderBuffer buffer;
      buffer.Init(data, data_size);
      return DecodePointCloud(&buffer, out);
    }
  
    uint32_t quantization_bits() const { return qinfo_.quantization_bits; }
    uint32_t compression_level() const { return compression_level_; }
    float range() const { return qinfo_.range; }
    uint32_t num_points() const { return num_points_; }
    uint32_t version() const { return version_; }
    std::string identification_string() const { return "FloatPointsTreeDecoder"; }
  
   private:
    bool DecodePointCloudKdTreeInternal(DecoderBuffer *buffer,
                                        std::vector<Point3ui> *qpoints);
  
    static const uint32_t version_ = 3;
    QuantizationInfo qinfo_;
    uint32_t num_points_;
    uint32_t compression_level_;
  };
  
  template <class OutputIteratorT>
  bool FloatPointsTreeDecoder::DecodePointCloud(DecoderBuffer *buffer,
                                                OutputIteratorT out) {
    std::vector<Point3ui> qpoints;
  
    uint32_t decoded_version;
    if (!buffer->Decode(&decoded_version))
      return false;
  
    if (decoded_version == 3) {
      int8_t method_number;
      if (!buffer->Decode(&method_number))
        return false;
  
      const PointCloudCompressionMethod method =
          static_cast<PointCloudCompressionMethod>(method_number);
  
      if (method == KDTREE) {
        if (!DecodePointCloudKdTreeInternal(buffer, &qpoints))
          return false;
      } else {  // Unsupported method.
        fprintf(stderr, "Method not supported. \n");
        return false;
      }
    } else if (decoded_version == 2) {  // Version 2 only uses KDTREE method.
      if (!DecodePointCloudKdTreeInternal(buffer, &qpoints))
        return false;
    } else {  // Unsupported version.
      fprintf(stderr, "Version not supported. \n");
      return false;
    }
  
    DequantizePoints3(qpoints.begin(), qpoints.end(), qinfo_, out);
    return true;
  }
  
  }  // namespace draco
  
  #endif  // DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_FLOAT_POINTS_TREE_DECODER_H_
  