/// <summary>
/// 把像素字节数组转图片
/// </summary>
/// <param name="buffer">像素数组，例如: [r, g, b, a, r, g, b, a ...]</param>
/// <param name="width">图片的宽度，例如: 512</param>
/// <param name="height">图片的高度，例如: 1024</param>
/// <param name="format">指定像素数组的组成方式，例如：SKColorType.Rgba8888</param>
/// <returns></returns>
public static SKBitmap Decode(byte[] buffer, int width, int height, SKColorType format)
{
    var data = SKData.CreateCopy(buffer);
    var newInfo = new SKImageInfo(width, height, format);
    var bitmap = new SKBitmap();
    bitmap.InstallPixels(newInfo, data.Data);
    return bitmap;
}

public static SKImage Decode(byte[] buffer, int width, int height, SKColorType format)
{
    var newInfo = new SKImageInfo(width, height, format);
    var data = SKData.CreateCopy(buffer);
    return SKImage.FromPixels(newInfo, data);
}