texture_atlas_maker.hpp

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// This file is part of the Rendering Engine project.
// Author: Alexander Obzherin <alexanderobzherin@gmail.com>
// Copyright (c) 2025 Alexander Obzherin
// Distributed under the terms of the zlib License. See LICENSE.md for details.
#pragma once
 
#include <iostream>
#include <unordered_map>
#include <map>
#include <memory>
#include <fstream>
#include <sstream>
#include <boost/filesystem.hpp>
#include "image_data.hpp"
 
namespace rendering_engine
{
class TextureAtlasMaker
{
public:
    TextureAtlasMaker( std::map<char, ImageData> images );
    ~TextureAtlasMaker() = default;
 
    bool CreateTextureAtlas( std::map<char, std::pair<unsigned int, unsigned int>>& texAtlasData, ImageData& texAtlasImage );
 
protected:
    //Calculate cell dimensions of one cell as max width (x component) and height (y component) in pixels
    void FindCellDimensions(unsigned int& outputWidth, unsigned int& outputHeight);
    //Calculate number of rows and columns, trying to aim a square form
    void CalculateGridDimensions(unsigned int& outputNumberOfColumns, unsigned int& outputNumberOfRows);
    //Log informaion to txt file
    void LogMetaData(const std::string& message)
    {
        mMetaDataOutputStream << message << std::endl;
    }
 
private:
    TextureAtlasMaker( TextureAtlasMaker const& );
    TextureAtlasMaker operator=(TextureAtlasMaker const&);
 
protected:
    //container of images
    std::map<char, ImageData> mImageCollection;
 
    static const char* const mMetaDataFileName;
    std::ofstream mMetaDataOutputStream;
 
    static const Color sDefaultPaletteBackgroundColor;
};
 
} //namespace rendering_engine