Bug Captor の 開發日記帳

public static bool Conv3x3(Bitmap b, ConvMatrix m)
{
    // Avoid divide by zero errors

    if (0 == m.Factor)
        return false; Bitmap 
    
    // GDI+ still lies to us - the return format is BGR, NOT RGB. 

    bSrc = (Bitmap)b.Clone();
    BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), 
                        ImageLockMode.ReadWrite, 
                        PixelFormat.Format24bppRgb); 
    BitmapData bmSrc = bSrc.LockBits(new Rectangle(0, 0, bSrc.Width, bSrc.Height), 
                       ImageLockMode.ReadWrite, 
                       PixelFormat.Format24bppRgb); 
    int stride = bmData.Stride; 
    int stride2 = stride * 2; 

    System.IntPtr Scan0 = bmData.Scan0; 
    System.IntPtr SrcScan0 = bmSrc.Scan0; 

    unsafe { 
        byte * p = (byte *)(void *)Scan0; 
        byte * pSrc = (byte *)(void *)SrcScan0; 
        int nOffset = stride - b.Width*3; 
        int nWidth = b.Width - 2; 
        int nHeight = b.Height - 2; 
        
        int nPixel; 
        
        for(int y=0;y < nHeight;++y) 
        { 
            for(int x=0; x < nWidth; ++x ) 
            {
                nPixel = ( ( ( (pSrc[2] * m.TopLeft) + 
                    (pSrc[5] * m.TopMid) + 
                    (pSrc[8] * m.TopRight) + 
                    (pSrc[2 + stride] * m.MidLeft) + 
                    (pSrc[5 + stride] * m.Pixel) + 
                    (pSrc[8 + stride] * m.MidRight) + 
                    (pSrc[2 + stride2] * m.BottomLeft) + 
                    (pSrc[5 + stride2] * m.BottomMid) + 
                    (pSrc[8 + stride2] * m.BottomRight)) 
                    / m.Factor) + m.Offset); 
                    
                if (nPixel < 0) nPixel = 0; 
                if (nPixel > 255) nPixel = 255; 
                p[5 + stride]= (byte)nPixel; 
                
                nPixel = ( ( ( (pSrc[1] * m.TopLeft) + 
                    (pSrc[4] * m.TopMid) + 
                    (pSrc[7] * m.TopRight) + 
                    (pSrc[1 + stride] * m.MidLeft) + 
                    (pSrc[4 + stride] * m.Pixel) + 
                    (pSrc[7 + stride] * m.MidRight) + 
                    (pSrc[1 + stride2] * m.BottomLeft) + 
                    (pSrc[4 + stride2] * m.BottomMid) + 
                    (pSrc[7 + stride2] * m.BottomRight)) 
                    / m.Factor) + m.Offset); 
                    
                if (nPixel < 0) nPixel = 0; 
                if (nPixel > 255) nPixel = 255; 
                p[4 + stride] = (byte)nPixel; 
                
                nPixel = ( ( ( (pSrc[0] * m.TopLeft) + 
                               (pSrc[3] * m.TopMid) + 
                               (pSrc[6] * m.TopRight) + 
                               (pSrc[0 + stride] * m.MidLeft) + 
                               (pSrc[3 + stride] * m.Pixel) + 
                               (pSrc[6 + stride] * m.MidRight) + 
                               (pSrc[0 + stride2] * m.BottomLeft) + 
                               (pSrc[3 + stride2] * m.BottomMid) + 
                               (pSrc[6 + stride2] * m.BottomRight)) 
                    / m.Factor) + m.Offset); 
                    
                if (nPixel < 0) nPixel = 0; 
                if (nPixel > 255) nPixel = 255; 
                p[3 + stride] = (byte)nPixel; 
                
                p += 3; 
                pSrc += 3; 
            } 
            
            p += nOffset; 
            pSrc += nOffset; 
        } 
    } 
    
    b.UnlockBits(bmData); 
    bSrc.UnlockBits(bmSrc); 
    return true; 
}