ConvertToIco.h

#pragma once
#include <NDEVR/Vector.h>
#include <iostream>
#include <fstream>
namespace NDEVR
{
#pragma pack(push, 1)
    class IcoFile
    {
    public:
        struct IconDirEntry
        {
            uint01 width; 
            uint01 height; 
            uint01 colorCount; 
            uint01 reserved; 
            uint02 planes; 
            uint02 bitCount; 
            uint04 bytesInRes; 
            uint04 imageOffset; 
        };

        struct IconDir
        {
            uint02 reserved; 
            uint02 type; 
            uint02 count; 
            IconDirEntry entries[1]; 
        };

        struct BitmapInfoHeader
        {
            uint04 biSize; 
            sint04 biWidth; 
            sint04 biHeight; 
            uint02 biPlanes; 
            uint02 biBitCount; 
            uint04 biCompression; 
            uint04 biSizeImage; 
            sint04 biXPelsPerMeter; 
            sint04 biYPelsPerMeter; 
            uint04 biClrUsed; 
            uint04 biClrImportant; 
        };
#pragma pack(pop)
        static bool ConvertRGBAToIcon(File icon, const uint01* rgba, Vector<2, uint04> size)
        {
            uint04 image_size = size.product() * 4; // 4 bytes per pixel for RGBA
            // Prepare bitmap headers
            BitmapInfoHeader bmpInfoHeader = { 40, cast<sint04>(size[X]), cast<sint04>(size[Y]) * 2, 1, 32, 0, static_cast<uint32_t>(image_size), 0, 0, 0, 0};
            // Prepare icon headers
            IconDir icon_dir;
            icon_dir.reserved = 0;
            icon_dir.type = 1;
            icon_dir.count = 1;
            IconDirEntry iconDirEntry = {
                static_cast<uint01>(size[X]),
                static_cast<uint01>(size[Y]),
                0,
                0,
                1,
                32,
                static_cast<uint04>(sizeof(BitmapInfoHeader) + image_size),
                static_cast<uint04>(sizeof(IconDir) + sizeof(IconDirEntry))
            };
            icon.getParentDirectory().create(false);//ensure parent exists
            if (!icon.open(File::e_binary_write))
                return false;
 
            // Write icon headers
            icon << StringView(reinterpret_cast<char*>(&icon_dir), sizeof(IconDir) - sizeof(icon_dir.entries));
            icon << StringView(reinterpret_cast<char*>(&iconDirEntry), sizeof(iconDirEntry));
 
            // Write bitmap headers
            icon << StringView(reinterpret_cast<char*>(&bmpInfoHeader), sizeof(bmpInfoHeader));
 
            // Write RGBA image data
            icon << StringView(reinterpret_cast<const char*>(rgba), image_size);
            icon.close();
            return true;
        }
    };
}