/// <summary>
/// Processes the image using a pixel buffer
/// </summary>
/// <param name="pixelBuffer">The pixel buffer to use</param>
/// <param name="sourceWidth">The source image width</param>
/// <param name="sourceHeight">The source image height</param>
/// <param name="sourceStride">The source data stride</param>
/// <returns>The processed pixel buffer</returns>
protected override byte[] Process(byte[] pixelBuffer, int sourceWidth, int sourceHeight, int sourceStride)
{
ComicsParameters parameters = this.DynamicParameter;
byte[] resultBuffer = new byte[sourceStride * sourceHeight];
int byteOffset = 0;
int blueGradient, greenGradient, redGradient = 0;
double blue = 0, green = 0, red = 0;
bool exceedsThreshold = false;
for (int offsetY = 1; offsetY < sourceHeight - 1; offsetY++)
{
for (int offsetX = 1; offsetX < sourceWidth - 1; offsetX++)
{
byteOffset = (offsetY * sourceStride) + (offsetX * 4);
blueGradient = Math.Abs(pixelBuffer[byteOffset - 4] - pixelBuffer[byteOffset + 4]);
blueGradient += Math.Abs(pixelBuffer[byteOffset - sourceStride] - pixelBuffer[byteOffset + sourceStride]);
byteOffset++;
greenGradient = Math.Abs(pixelBuffer[byteOffset - 4] - pixelBuffer[byteOffset + 4]);
greenGradient += Math.Abs(pixelBuffer[byteOffset - sourceStride] - pixelBuffer[byteOffset + sourceStride]);
byteOffset++;
redGradient = Math.Abs(pixelBuffer[byteOffset - 4] - pixelBuffer[byteOffset + 4]);
redGradient += Math.Abs(pixelBuffer[byteOffset - sourceStride] - pixelBuffer[byteOffset + sourceStride]);
if (blueGradient + greenGradient + redGradient > parameters.Threshold)
{
exceedsThreshold = true;
}
else
{
byteOffset -= 2;
blueGradient = Math.Abs(pixelBuffer[byteOffset - 4] - pixelBuffer[byteOffset + 4]);
byteOffset++;
greenGradient = Math.Abs(pixelBuffer[byteOffset - 4] - pixelBuffer[byteOffset + 4]);
byteOffset++;
redGradient = Math.Abs(pixelBuffer[byteOffset - 4] - pixelBuffer[byteOffset + 4]);
if (blueGradient + greenGradient + redGradient > parameters.Threshold)
{
exceedsThreshold = true;
}
else
{
byteOffset -= 2;
blueGradient = Math.Abs(pixelBuffer[byteOffset - sourceStride] - pixelBuffer[byteOffset + sourceStride]);
byteOffset++;
greenGradient = Math.Abs(pixelBuffer[byteOffset - sourceStride] - pixelBuffer[byteOffset + sourceStride]);
byteOffset++;
redGradient = Math.Abs(pixelBuffer[byteOffset - sourceStride] - pixelBuffer[byteOffset + sourceStride]);
if (blueGradient + greenGradient + redGradient > parameters.Threshold)
{
exceedsThreshold = true;
}
else
{
byteOffset -= 2;
blueGradient = Math.Abs(pixelBuffer[byteOffset - 4 - sourceStride] - pixelBuffer[byteOffset + 4 + sourceStride]);
blueGradient += Math.Abs(pixelBuffer[byteOffset - sourceStride + 4] - pixelBuffer[byteOffset + sourceStride - 4]);
byteOffset++;
greenGradient = Math.Abs(pixelBuffer[byteOffset - 4 - sourceStride] - pixelBuffer[byteOffset + 4 + sourceStride]);
greenGradient += Math.Abs(pixelBuffer[byteOffset - sourceStride + 4] - pixelBuffer[byteOffset + sourceStride - 4]);
byteOffset++;
redGradient = Math.Abs(pixelBuffer[byteOffset - 4 - sourceStride] - pixelBuffer[byteOffset + 4 + sourceStride]);
redGradient += Math.Abs(pixelBuffer[byteOffset - sourceStride + 4] - pixelBuffer[byteOffset + sourceStride - 4]);
exceedsThreshold = blueGradient + greenGradient + redGradient > parameters.Threshold;
}
}
}
byteOffset -= 2;
if (exceedsThreshold)
{
blue = 0;
green = 0;
red = 0;
}
else
{
blue = pixelBuffer[byteOffset];
green = pixelBuffer[byteOffset + 1];
red = pixelBuffer[byteOffset + 2];
}
blue = blue > 255 ? 255 : (blue < 0 ? 0 : blue);
green = green > 255 ? 255 : (green < 0 ? 0 : green);
red = red > 255 ? 255 : (red < 0 ? 0 : red);
resultBuffer[byteOffset] = (byte)blue;
resultBuffer[byteOffset + 1] = (byte)green;
resultBuffer[byteOffset + 2] = (byte)red;
resultBuffer[byteOffset + 3] = 255;
}
}
return(resultBuffer);
}
/// <summary>
/// Pre-processes the source bitmap
/// </summary>
/// <returns>The processed bitmap</returns>
/// <param name="sourceBitmap">The source bitmap.</param>
protected override Bitmap PreProcess(Bitmap sourceBitmap)
{
ComicsParameters parameters = this.DynamicParameter;
return(sourceBitmap.SmoothingFilter(parameters.Smoothing));
}
