ImageSharp/src/ImageSharp/Formats/Qoi/QoiDecoder.cs

// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using SixLabors.ImageSharp.PixelFormats;

namespace SixLabors.ImageSharp.Formats.Qoi;

internal class QoiDecoder : ImageDecoder
{
    private QoiDecoder()
    {
    }

    public static QoiDecoder Instance { get; } = new();

    /// <inheritdoc />
    protected override Image<TPixel> Decode<TPixel>(DecoderOptions options, Stream stream, CancellationToken cancellationToken)
    {
        Guard.NotNull(options, nameof(options));
        Guard.NotNull(stream, nameof(stream));

        QoiDecoderCore decoder = new(options);
        Image<TPixel> image = decoder.Decode<TPixel>(options.Configuration, stream, cancellationToken);

        ScaleToTargetSize(options, image);

        return image;
    }

    /// <inheritdoc />
    protected override Image Decode(DecoderOptions options, Stream stream, CancellationToken cancellationToken)
    {
        Guard.NotNull(options, nameof(options));
        Guard.NotNull(stream, nameof(stream));
        return this.Decode<Rgba32>(options, stream, cancellationToken);
    }

    protected override ImageInfo Identify(DecoderOptions options, Stream stream, CancellationToken cancellationToken)
    {
        Guard.NotNull(options, nameof(options));
        Guard.NotNull(stream, nameof(stream));
        return new QoiDecoderCore(options).Identify(options.Configuration, stream, cancellationToken);
    }
}