150 lines
3.8 KiB
C++
150 lines
3.8 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include "ImageLoaderPnm.hpp"
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#include <sstream>
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#include <fstream>
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namespace OpenVulkano::Image
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{
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std::unique_ptr<Image> ImageLoaderPnm::loadFromFile(const std::string& filePath)
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{
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std::ifstream file(filePath, std::ios::binary);
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if (!file.is_open())
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{
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throw std::runtime_error("Failed to open file: " + filePath);
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}
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std::vector<uint8_t> buffer((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
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return loadFromMemory(buffer);
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}
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std::unique_ptr<Image> ImageLoaderPnm::loadFromMemory(const std::vector<uint8_t>& buffer)
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{
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std::istringstream stream(std::string(buffer.begin(), buffer.end()));
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PnmHeader header = parseHeader(stream);
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std::unique_ptr<Image> result = std::make_unique<Image>();
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result->resolution.x = header.width;
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result->resolution.y = header.height;
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result->resolution.z = 1;
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if (header.magic == 1 || header.magic == 2 || header.magic == 3)
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{
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result->data = readTextData(stream, header);
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}
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else if (header.magic == 4 || header.magic == 5 || header.magic == 6)
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{
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result->data = readBinaryData(stream, header);
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}
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else
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{
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throw std::runtime_error("Unsupported format: P" + (header.magic + '0'));
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}
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if (header.magic == 1 || header.magic == 2 || header.magic == 4 || header.magic == 5)
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{
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result->dataFormat = DataFormat::Format::R8_UINT;
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}
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else
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{
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result->dataFormat = DataFormat::Format::R8G8B8_UINT;
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}
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return result;
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}
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Math::Vector2i ImageLoaderPnm::GetImageDimensions(const std::string& filename)
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{
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std::ifstream file(filename, std::ios::binary);
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if (!file.is_open())
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{
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throw std::runtime_error("Failed to open file: " + filename);
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}
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PnmHeader header = parseHeader(file);
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return Math::Vector2i(header.width, header.height);
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}
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PnmHeader ImageLoaderPnm::parseHeader(std::istream& stream)
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{
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PnmHeader header;
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char pMagic;
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stream >> pMagic;
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if (pMagic != 'P')
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{
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throw std::runtime_error("Unsupported magic");
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}
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stream >> header.magic;
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header.magic -= '0';
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if (header.magic != 1 && header.magic != 2 && header.magic != 3 && header.magic != 4 && header.magic != 5
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&& header.magic != 6)
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{
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throw std::runtime_error("Unsupported magic number: P" + (header.magic + '0'));
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}
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stream >> header.width >> header.height;
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if (header.magic != 1 && header.magic != 4)
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{
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stream >> header.maxVal;
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}
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stream.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
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return header;
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}
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Array<uint8_t> ImageLoaderPnm::readBinaryData(std::istream& stream, const PnmHeader& header)
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{
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size_t dataSize = header.width * header.height * ((header.magic == 6) ? 3 : 1);
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Array<uint8_t> data(dataSize);
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if (header.magic == 4)
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{
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size_t rowBytes = (header.width + 7) / 8;
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Array<uint8_t> rowBuffer(rowBytes);
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size_t index = 0;
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for (int y = 0; y < header.height; ++y)
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{
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stream.read(reinterpret_cast<char*>(rowBuffer.Data()), rowBytes);
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for (int x = 0; x < header.width; ++x)
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{
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size_t byteIndex = x / 8;
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size_t bitIndex = 7 - (x % 8);
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data[index++] = (rowBuffer[byteIndex] >> bitIndex) & 1 ? 255 : 0;
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}
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}
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}
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else
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{
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stream.read(reinterpret_cast<char*>(data.Data()), dataSize);
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}
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return data;
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}
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Array<uint8_t> ImageLoaderPnm::readTextData(std::istream& stream, const PnmHeader& header)
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{
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Array<uint8_t> data(header.width * header.height * ((header.magic == 3) ? 3 : 1));
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for (size_t i = 0; i < data.Size(); ++i)
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{
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int value;
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stream >> value;
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if (header.magic == 1 || header.magic == 4)
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{
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data[i] = static_cast<uint8_t>(value * 255);
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}
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else
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{
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data[i] = static_cast<uint8_t>((value * 255) / header.maxVal);
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}
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}
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return data;
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}
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}; |