Question

我正在编写一个可以截取屏幕截图的应用程序，它需要超快速（多秒钟）然后处理它们。这是我正在使用的代码 - 它可以工作，但速度非常慢。

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

public static Bitmap CaptureScreen()
{
    Bitmap BMP = new Bitmap(System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width,
                            System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height,
                            System.Drawing.Imaging.PixelFormat.Format32bppArgb);
    System.Drawing.Graphics GFX = System.Drawing.Graphics.FromImage(BMP);
    GFX.CopyFromScreen(System.Windows.Forms.Screen.PrimaryScreen.Bounds.X,
                        System.Windows.Forms.Screen.PrimaryScreen.Bounds.Y,
                        0, 0,
                        System.Windows.Forms.Screen.PrimaryScreen.Bounds.Size,
                        System.Drawing.CopyPixelOperation.SourceCopy);

    return BMP;
}

用法 - ：

Bitmap im1 = new Bitmap(CaptureScreen());

上面的代码工作正常但需要至少5秒才能处理。所以有人可以提供一个类似上面的方法，除了更快，我也想使用前景窗口捕获，而不是整个屏幕。

编辑以下是比较代码！

private void timer2_Tick(object sender, EventArgs e)
{

    pictureBox1.Image = CaptureScreen();
    pictureBox2.Image = CaptureScreenOld();
    Bitmap im1 = (Bitmap)pictureBox1.Image;
    Bitmap im2 = (Bitmap)pictureBox2.Image;
    for (int y = 0; y < pictureBox1.Height; y++)
    {
        for (int x = 0; x < pictureBox1.Width; x++)
        {
            // Get the color of the current pixel in each bitmap
            Color color1 = im1.GetPixel(x, y);
            Color color2 = im2.GetPixel(x, y);

            // Check if they're the same
            if (color1 != color2)
            {
                // If not, generate a color...
                Color myRed = Color.FromArgb(90, 0, 0);
                // .. and set the pixel in one of the bitmaps
                im2.SetPixel(x, y, myRed);
                pictureBox2.Image = im2;
            }
        }
    }
}

Answer 1

好的，使用GetPixel多次比较像素真的慢。把你的位锁定成一个数组：

private static void CompareBitmaps(Bitmap a, Bitmap b) {
    Stopwatch sw = new Stopwatch();

    sw.Start();

    var lockRect = new Rectangle(0, 0, a.Width, a.Height);
    BitmapData ad = a.LockBits(lockRect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
    BitmapData bd = b.LockBits(lockRect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);

    Int32[] apixels = new Int32[ad.Width * ad.Height];
    Int32[] bpixels = new Int32[bd.Width * bd.Height];

    Marshal.Copy(ad.Scan0, apixels, 0, apixels.Length);
    Marshal.Copy(bd.Scan0, bpixels, 0, bpixels.Length);

    for(int i = 0; i < apixels.Length; i++) {
        if(apixels[i] != bpixels[i]) {
            unchecked {
                bpixels[i] = (int)0xff5a0000;
            }
        }
    }

    Marshal.Copy(bpixels, 0, bd.Scan0, bpixels.Length);

    a.UnlockBits(ad);
    b.UnlockBits(bd);

    sw.Stop();

    Console.WriteLine("CompareBitmaps took {0}.", sw.Elapsed);
}

我得到的时间约为240毫秒;这够了吗？

屏幕截图捕获非常慢

1 个答案: