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// 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.
//
// File contains helper classes used for parsing of PLY files. The classes are
// used by the PlyDecoder (ply_decoder.h) to read a point cloud or mesh from a
// source PLY file.
// TODO(ostava): Currently, we support only binary PLYs encoded in the little
// endian format ("format binary_little_endian 1.0").
#ifndef DRACO_IO_PLY_READER_H_
#define DRACO_IO_PLY_READER_H_
#include <map>
#include <vector>
#include "draco/core/decoder_buffer.h"
#include "draco/core/draco_types.h"
#include "draco/core/status.h"
#include "draco/core/status_or.h"
namespace draco {
// A single PLY property of a given PLY element. For "vertex" element this can
// contain data such as "x", "y", or "z" coordinate of the vertex, while for
// "face" element this usually contains corner indices.
class PlyProperty {
public:
friend class PlyReader;
PlyProperty(const std::string &name, DataType data_type, DataType list_type);
void ReserveData(int num_entries) {
data_.reserve(DataTypeLength(data_type_) * num_entries);
}
int64_t GetListEntryOffset(int entry_id) const {
return list_data_[entry_id * 2];
}
int64_t GetListEntryNumValues(int entry_id) const {
return list_data_[entry_id * 2 + 1];
}
const void *GetDataEntryAddress(int entry_id) const {
return data_.data() + entry_id * data_type_num_bytes_;
}
void push_back_value(const void *data) {
data_.insert(data_.end(), static_cast<const uint8_t *>(data),
static_cast<const uint8_t *>(data) + data_type_num_bytes_);
}
const std::string &name() const { return name_; }
bool is_list() const { return list_data_type_ != DT_INVALID; }
DataType data_type() const { return data_type_; }
int data_type_num_bytes() const { return data_type_num_bytes_; }
DataType list_data_type() const { return list_data_type_; }
int list_data_type_num_bytes() const { return list_data_type_num_bytes_; }
private:
std::string name_;
std::vector<uint8_t> data_;
// List data contain pairs of <offset, number_of_values>
std::vector<int64_t> list_data_;
DataType data_type_;
int data_type_num_bytes_;
DataType list_data_type_;
int list_data_type_num_bytes_;
};
// A single PLY element such as "vertex" or "face". Each element can store
// arbitrary properties such as vertex coordinates or face indices.
class PlyElement {
public:
PlyElement(const std::string &name, int64_t num_entries);
void AddProperty(const PlyProperty &prop) {
property_index_[prop.name()] = static_cast<int>(properties_.size());
properties_.emplace_back(prop);
if (!properties_.back().is_list())
properties_.back().ReserveData(static_cast<int>(num_entries_));
}
const PlyProperty *GetPropertyByName(const std::string &name) const {
const auto it = property_index_.find(name);
if (it != property_index_.end())
return &properties_[it->second];
return nullptr;
}
int num_properties() const { return static_cast<int>(properties_.size()); }
int num_entries() const { return static_cast<int>(num_entries_); }
const PlyProperty &property(int prop_index) const {
return properties_[prop_index];
}
PlyProperty &property(int prop_index) { return properties_[prop_index]; }
private:
std::string name_;
int64_t num_entries_;
std::vector<PlyProperty> properties_;
std::map<std::string, int> property_index_;
};
// Class responsible for parsing PLY data. It produces a list of PLY elements
// and their properties that can be used to construct a mesh or a point cloud.
class PlyReader {
public:
PlyReader();
Status Read(DecoderBuffer *buffer);
const PlyElement *GetElementByName(const std::string &name) const {
const auto it = element_index_.find(name);
if (it != element_index_.end())
return &elements_[it->second];
return nullptr;
}
int num_elements() const { return static_cast<int>(elements_.size()); }
const PlyElement &element(int element_index) const {
return elements_[element_index];
}
private:
enum Format { kLittleEndian = 0, kAscii };
Status ParseHeader(DecoderBuffer *buffer);
StatusOr<bool> ParseEndHeader(DecoderBuffer *buffer);
bool ParseElement(DecoderBuffer *buffer);
StatusOr<bool> ParseProperty(DecoderBuffer *buffer);
bool ParsePropertiesData(DecoderBuffer *buffer);
bool ParseElementData(DecoderBuffer *buffer, int element_index);
bool ParseElementDataAscii(DecoderBuffer *buffer, int element_index);
// Splits |line| by whitespace characters.
std::vector<std::string> SplitWords(const std::string &line);
DataType GetDataTypeFromString(const std::string &name) const;
std::vector<PlyElement> elements_;
std::map<std::string, int> element_index_;
Format format_;
};
} // namespace draco
#endif // DRACO_IO_PLY_READER_H_
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