- unsigned int redUpper = src.GetRed(x-1, y-1);
- unsigned int greenUpper = src.GetGreen(x-1, y-1);
- unsigned int blueUpper = src.GetBlue(x-1, y-1);
-
- // if the upper element is lighter than current
- if ( IS_GREATER(redUpper, greenUpper, blueUpper, redCur, greenCur, blueCur) )
- {
- dest.SetRGB(x,y, darkCol.Red(), darkCol.Green(), darkCol.Blue());
- }
- // if the current element is ligher than the upper
- else if ( IS_GREATER(redCur, greenCur, blueCur, redUpper, greenUpper, blueUpper) )
- {
- dest.SetRGB(x,y, lightCol.Red(), lightCol.Green(), lightCol.Blue());
- }
- else
- {
- unsigned int red1 = dest.GetRed(x-1, y-1);
- unsigned int green1 = dest.GetGreen(x-1, y-1);
- unsigned int blue1 = dest.GetBlue(x-1, y-1);
-
- if ( red1 == lightCol.Red() && green1 == lightCol.Green() && blue1 == lightCol.Blue() )
- dest.SetRGB(x, y, bgCol.Red(), bgCol.Green(), bgCol.Blue());
- else if ( red1 == darkCol.Red() && green1 == darkCol.Green() && blue1 == darkCol.Blue() )
- dest.SetRGB(x, y, darkCol.Red(), darkCol.Green(), darkCol.Blue());
- else
- dest.SetRGB(x, y, bgCol.Red(), bgCol.Green(), bgCol.Blue());
- }
- }
-
- // go zig-zag