//[DllImport("gdi32.dll")]
//static extern uint SetPixel(IntPtr hdc, int X, int Y, uint crColor);
//[DllImport("gdi32.dll")]
//static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);
//public static bool Conv3x3(IntPtr hDC, int nHeight, int nWidth, ConvMatrix m) {
// // Avoid divide by zero errors
// if (0 == m.Factor) return false;
// unsafe {
// int nPixel;
// byte[] color;
// for (int y = 0; y < nHeight; ++y) {
// for (int x = 0; x < nWidth; ++x) {
// color = GetPixel(hDC, x, y);
// 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;
//}
public static bool Smooth(Bitmap b, int nWeight /* default to 1 */)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(1);
m.Pixel = nWeight;
m.Factor = nWeight + 8;
return BitmapFilter.Conv3x3(b, m);
}
public static bool Sharpen(Bitmap b, int nWeight /* default to 11*/ )
{
ConvMatrix m = new ConvMatrix();
m.SetAll(0);
m.Pixel = nWeight;
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = -2;
m.Factor = nWeight - 8;
return BitmapFilter.Conv3x3(b, m);
}
public static bool GaussianBlur(Bitmap b, int nWeight /* default to 4*/)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(1);
m.Pixel = nWeight;
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 2;
m.Factor = nWeight + 12;
return BitmapFilter.Conv3x3(b, m);
}
public static bool MeanRemoval(Bitmap b, int nWeight /* default to 9*/ )
{
ConvMatrix m = new ConvMatrix();
m.SetAll(-1);
m.Pixel = nWeight;
m.Factor = nWeight - 8;
return BitmapFilter.Conv3x3(b, m);
}
public static bool EmbossLaplacian(Bitmap b)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(-1);
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 0;
m.Pixel = 4;
m.Offset = 127;
return BitmapFilter.Conv3x3(b, m);
}
