如何从 BitmapImage 获取数组 System.Windows.Media.Color

Question

我正在处理一个编辑图标的项目，我需要加载一个图标。 我使用以下代码保存此图标：

        var sd = new SaveFileDialog();
        sd.ShowDialog();
        sd.Filter = "File *.ico|*.ico";
        sd.FilterIndex = 0;
        var path = sd.FileName;
        if (!sd.CheckPathExists) return;
        var w = new WriteableBitmap(Dimention, Dimention, 1, 1, PixelFormats.Pbgra32, null);
        var pix = new int[Dimention,Dimention];
        for (int i = 0; i < Dimention; i++)
            for (int j = 0; j < Dimention; j++)
                pix[i, j] = ToArgb(IconCanvas.Board[i, j].Background.Color);
        w.WritePixels(new Int32Rect(0, 0, Dimention, Dimention), pix, Dimention*4, 0, 0);
        var e = new BmpBitmapEncoder();
        e.Frames.Add(BitmapFrame.Create(w));
        var file = new FileStream(path, FileMode.Create);
        e.Save(file);
        file.Close();

所以，我需要从保存的这些图像中获取颜色[，]。我假设图标的大小是一个正方形（宽度=高度）。感谢您的帮助。

Answer 1

以下代码是我的问题的解决方案（使用位图）：

// get the BitmapImage
var image = new BitmapImage(new Uri(path));
if (image.PixelHeight != image.PixelWidth) return;
Dimension = image.PixelHeight;
// copy to byte array
int stride = image.PixelWidth * 4;
byte[] buffer = new byte[stride * image.PixelHeight];
image.CopyPixels(buffer, stride, 0);
// create a bitmap
var bitmap = new System.Drawing.Bitmap(image.PixelWidth, image.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
// lock bitmap data
System.Drawing.Imaging.BitmapData bitmapData = bitmap.LockBits(new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), System.Drawing.Imaging.ImageLockMode.WriteOnly, bitmap.PixelFormat);
// copy byte array to bitmap data
System.Runtime.InteropServices.Marshal.Copy(buffer, 0, bitmapData.Scan0, buffer.Length);
// unlock
bitmap.UnlockBits(bitmapData);
// copy to Color array
var colors = new Color[Dimension, Dimension];
for (int i = 0; i < bitmap.Height; i++)
    for (int j = 0; j < bitmap.Width; j++)
    {
        var mediacolor = bitmap.GetPixel(i, j);
        var drawingcolor = Color.FromArgb(mediacolor.A, mediacolor.R, mediacolor.G, mediacolor.B);
        colors[i, j] = drawingcolor;
    }

如果您需要，我希望可以解决此问题。