using System.IO;

namespace Misaki.HighPerformance.Image;

public struct ImageInfo
{
    public int Width;
    public int Height;
    public ColorComponents ColorComponents;
    public int BitsPerChannel;

    public static unsafe ImageInfo? FromStream(Stream stream)
    {
        int width, height, comp;
        var context = new StbImage.stbi__context(stream);

        var is16Bit = StbImage.stbi__is_16_main(context) == 1;
        StbImage.stbi__rewind(context);

        var infoResult = StbImage.stbi__info_main(context, &width, &height, &comp);
        StbImage.stbi__rewind(context);

        if (infoResult == 0)
            return null;

        return new ImageInfo
        {
            Width = width,
            Height = height,
            ColorComponents = (ColorComponents)comp,
            BitsPerChannel = is16Bit ? 16 : 8
        };
    }
}