将像素设置为 PictureBox

Question

上下文：我有一个程序可以获取任何图像的 ArGB。把它扔进Color ARGBFormat = Color.FromArgb(alpha, red, green, blue); 现在我想把它放到PictureBox 中。我没有完整的像素阵列（它或多或少是分散的）。

代码：

Bitmap bmp = new Bitmap(ImagePath);
Rectangle bmpRec = new Rectangle(0, 0, bmp.Width, bmp.Height); //Creates Rectangle for holding picture
BitmapData bmpData = bmp.LockBits(bmpRec, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb); //Gets the Bitmap data
IntPtr Pointer = bmpData.Scan0;
int DataBytes = Math.Abs(bmpData.Stride) * bmp.Height; //Gets array size
byte[] rgbValues = new byte[DataBytes]; //Creates array
Marshal.Copy(Pointer, rgbValues, 0, DataBytes); //Copies of out memory
StringBuilder EveryPixel = new StringBuilder(" ");
int PixelSize = 4;
Color ARGBFormat;
Bitmap ImageOut = new Bitmap(bmp.Width, bmp.Height);

unsafe
{
    for (int y = 0; y < bmpData.Height; y++)
    {
        byte* row = (byte*)bmpData.Scan0 + (y * bmpData.Stride);
        for (int x = 0; x < bmpData.Width; x++)
        {
            int offSet = x * PixelSize;
            // read pixels
            byte blue = row[offSet];
            byte green = row[offSet + 1];
            byte red = row[offSet + 2];
            byte alpha = row[offSet + 3];
            ARGBFormat = Color.FromArgb(alpha, red, green, blue);
            ImageOut.SetPixel(x, y, ARGBFormat); //Slow
            EveryPixel.Append(ARGBFormat);
        }
    }
}

我想使用我一直在编写的代码 ^ 在不使用 SetPixels 的情况下显示到 PictureBox 中。我想使用 LockBits，因为它是最优化的方法。

Answer 1

给你

循环前的初始化代码

BitmapData bitmapData = ImageOut.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);

byte[] pixels = new byte[bmp.Width * bmp.Height * 4]; //4 means 1 byte for each a r g b
IntPtr ptr = bitmapData.Scan0;
Marshal.Copy(ptr , pixels, 0, pixels.Length);

更新循环内的像素

pixels[offSet] = blue;
pixels[offSet + 1] = green;
pixels[offSet + 2] = red;
pixels[offSet + 3] = alpha;

终于要清理代码了

bitmapData.UnlockBits();

所以对我来说代码看起来像

unsafe
{

   BitmapData bitmapData = ImageOut.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);

   byte[] pixels = new byte[bmp.Width * bmp.Height * 4]; //4 means 1 byte for each a r g b
   IntPtr ptr = bitmapData.Scan0;
   Marshal.Copy(ptr , pixels, 0, pixels.Length);

   for (int y = 0; y < bmpData.Height; y++)
   {
        byte* row = (byte*)bmpData.Scan0 + (y * bmpData.Stride);
        for (int x = 0; x < bmpData.Width; x++)
        {
            int offSet = x * PixelSize;
            // read pixels
            byte blue = row[offSet];
            byte green = row[offSet + 1];
            byte red = row[offSet + 2];
            byte alpha = row[offSet + 3];

            //copy to target
            pixels[offSet] = blue;
            pixels[offSet + 1] = green;
            pixels[offSet + 2] = red;
            pixels[offSet + 3] = alpha;
        }
    }
    bitmapData.UnlockBits();
}

//set to picturebox
pictureBox.Image = ImageOut;

我希望这对你有用。