SimdPaddleOCR

using System.Runtime.InteropServices;
using Sdcb.SimdPaddleOCR;
using Sdcb.SimdPaddleOCR.Models.ChineseV6Tiny;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.PixelFormats;

using PaddleOcrAll ocr = await PaddleOcrAll.LoadAsync(ChineseV6TinyModels.Default);
// Clone Default：改 Configuration.Default 会丢掉 PNG/JPEG 解码器
Configuration cfg = Configuration.Default.Clone();
cfg.PreferContiguousImageBuffers = true;
using Image<Rgba32> image = await Image.LoadAsync<Rgba32>(
    new DecoderOptions { Configuration = cfg }, "sample.jpg");
if (!image.DangerousTryGetSinglePixelMemory(out Memory<Rgba32> memory))
{
    Rgba32[] copy = new Rgba32[image.Width * image.Height];
    image.CopyPixelDataTo(copy);
    memory = copy;
}

PaddleOcrResult result = ocr.Run(MemoryMarshal.AsBytes(memory.Span),
    image.Width, image.Height, format: ImagePixelFormat.Rgba32);
Console.WriteLine(result.Text);

using SkiaSharp;

using SKBitmap bitmap = SKBitmap.Decode("sample.jpg").Copy(SKColorType.Bgra8888);
unsafe
{
    PaddleOcrResult result = ocr.Run(
        new ReadOnlySpan<byte>((byte*)bitmap.GetPixels(), bitmap.RowBytes * bitmap.Height),
        bitmap.Width, bitmap.Height, bitmap.RowBytes, ImagePixelFormat.Bgra32);
}

using OpenCvSharp;

using Mat image = Cv2.ImRead("sample.jpg", ImreadModes.Color);
int stride = (int)image.Step();
unsafe
{
    PaddleOcrResult result = ocr.Run(
        new ReadOnlySpan<byte>((byte*)image.Data, stride * image.Height),
        image.Width, image.Height, stride, ImagePixelFormat.Bgr24);
}

using System.Drawing;
using System.Drawing.Imaging;

using Bitmap bitmap = new("sample.jpg");
BitmapData data = bitmap.LockBits(new(0, 0, bitmap.Width, bitmap.Height),
    ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
try
{
    unsafe
    {
        PaddleOcrResult result = ocr.Run(
            new ReadOnlySpan<byte>((byte*)data.Scan0, data.Stride * bitmap.Height),
            bitmap.Width, bitmap.Height, data.Stride, ImagePixelFormat.Bgra32);
    }
}
finally { bitmap.UnlockBits(data); }

using PaddleOcrAll ocr = await PaddleOcrAll.LoadAsync(ChineseV6TinyModels.Default,
    new PaddleOcrOptions
    {
        Detector   = new PaddleOcrDetectorOptions   { Backend = OcrBackend.Vulkan },
        Recognizer = new PaddleOcrRecognizerOptions { Backend = OcrBackend.Vulkan },
        Classifier = new PaddleOcrClassifierOptions { Backend = OcrBackend.Vulkan },
    });

// 默认 OcrBackend.Auto：有满足条件的 GPU 就用，否则留在 CPU。
// macOS arm64 上把 Vulkan 换成 OcrBackend.Metal。