c# - 如何在 SharpDX 上获取 Direct2D 位图的像素颜色

Question

我使用 SharpDX，但我不明白如何在位图中获取像素颜色。我找到了 CopySubresourceRegion 方法，但它适用于 Direct3D。我有一个奇怪的想法:

我可以创建 RenderForm 并在窗体上绘制位图。然后得到表格的图形。然后通过“new Bitmap(width, height, graphics)”创建位图。然后从新位图中获取像素颜色；

Answer 1

我编写了获取像素颜色的特殊函数。这解决了我的问题；)C#——SharpDX

Color4 GetPixel(Bitmap image, int x, int y, RenderTarget renderTarget) {
        var deviceContext2d = renderTarget.QueryInterface<DeviceContext>();
        var bitmapProperties = new BitmapProperties1();
        bitmapProperties.BitmapOptions = BitmapOptions.CannotDraw | BitmapOptions.CpuRead;
        bitmapProperties.PixelFormat = image.PixelFormat;
        var bitmap1 = new Bitmap1(deviceContext2d, new Size2((int)image.Size.Width, (int)image.Size.Height), bitmapProperties);
        bitmap1.CopyFromBitmap(image);
        var map = bitmap1.Map(MapOptions.Read);
        var size = (int)image.Size.Width * (int)image.Size.Height * 4;
        byte[] bytes = new byte[size];
        Marshal.Copy(map.DataPointer, bytes, 0, size);
        bitmap1.Unmap();
        bitmap1.Dispose();
        deviceContext2d.Dispose();
        var position = (y * (int)image.Size.Width + x) * 4;
        return new Color4(bytes[position], bytes[position + 1], bytes[position + 2], bytes[position + 3]);
    }