SimdCodecs

using Sdcb.SimdCodecs;
using Sdcb.SimdCodecs.Abstractions;

byte[] file = File.ReadAllBytes("photo.webp");   // JPEG, PNG, TIFF, WebP, GIF, JPEG 2000, JBIG2

// Sniffs the format from the magic bytes; headers only
if (!SimdCodecs.TryReadInfo(file, out ImageInfo info)) throw new InvalidDataException();
Console.WriteLine($"{info.Width}×{info.Height}, {info.BitDepth}-bit, {info.FrameCount} frame(s), {info.Orientation}");

// Decode into a buffer you own (R G B A)
byte[] rgba = new byte[info.Width * info.Height * 4];
SimdCodecs.TryDecodeIntoRgba8(file, rgba);

// Straight into SkiaSharp / WPF / OpenCV pixel memory — no RGBA frame in between
using SKBitmap bmp = new(info.Width, info.Height, SKColorType.Bgra8888, SKAlphaType.Unpremul);
unsafe
{
    Span<byte> dst = new((byte*)bmp.GetPixels(), bmp.RowBytes * bmp.Height);
    SimdCodecs.TryDecodeInto(file, dst, bmp.RowBytes, ImagePixelFormat.Bgra32);
}

// OCR wants grey: a colour JPEG hands over its Y plane, chroma skipped
byte[] grey = new byte[info.Width * info.Height];
SimdCodecs.TryDecodeInto(file, grey, info.Width, ImagePixelFormat.Gray8);

using Sdcb.SimdCodecs.Jpeg;

// SIMD encoder: baseline / optimised Huffman / progressive, 4:2:0 or 4:4:4, EXIF and XMP
byte[] jpeg = JpegEncoder.Encode(rgba, info.Width, info.Height, channels: 4, new JpegEncodeOptions
{
    Quality = 90,
    Subsampling = JpegSubsampling.Chroma420,
    Progressive = true,
});
File.WriteAllBytes("photo.jpg", jpeg);

// Composited WebP / GIF frames with durations, a multi-page TIFF’s pages — one API
if (SimdCodecs.TryOpenFrames(file, out IImageFrameReader? reader))
using (reader)
{
    for (int i = 0; i < reader.FrameCount; i++)
    {
        reader.TryGetFrameInfo(i, out ImageFrameInfo frame);
        byte[] buffer = new byte[frame.Info.Width * frame.Info.Height * 4];
        reader.TryDecodeFrameInto(i, buffer, stride: 0, ImagePixelFormat.Rgba32);
        Console.WriteLine($"#{i}: {frame.Info.Width}×{frame.Info.Height}, {frame.Duration?.TotalMilliseconds} ms");
    }
}