Draw embedded Base64 image

decodeimage.cpp

#include <Siv3D.hpp>

//#define ENCODE_IMAGES

String encodeFile(const FilePath& filepath)
{
    return Base64::Encode(BinaryReader(filepath).readWhole());
}

void Main()
{
#ifdef ENCODE_IMAGES
    TextWriter writer(L"encodedImages.txt");
    for (auto& file : Array<String>{ L"1.png", L"2.png", L"3.png" })
        if (FileSystem::Exists(file))
            writer.writeln(encodeFile(file));
    return;
#endif

    // Base64 でエンコードされた PNG 画像
    const String encodedImage = L"iVBORw0KGgoAAAANSUhEUgAAAEAAAAAgAgMAAADf85YXAAAACVBMVEXf/+8kSwCfv399yLhfAAAAnUlEQVQoz7XRQQrCUAwE0Al0BHddmPsETzCFfOhxFDyCB/b/Fu2v3eosH9lMBod42SUxYpfhl+ABWFINrMxASqBzaOACoFEYyFMFK40agmQFCnr24GFJzB3ACpGQYoWsYOENvAOGdM0FxEgLi8+FXGCYKrADbHCp4OiBQumB97DEbYO1S0jTYy0HVMIklXf9cxHgoVwe9JcZjmN/5wXZ+S43N2BYQwAAAABJRU5ErkJggg==";

    const Texture texture(Base64::Decode(encodedImage));

    Window::Resize(768, 512);

    Graphics2D::SetSamplerState(SamplerState::ClampPoint);

    while (System::Update())
    {
        for (int i : step(5))
        {
            for (int j : step(3))
            {
                texture.scale(4).draw(j * 256, (i-1) * 128 + System::FrameCount() % 128);
            }
        }
    }
}