Work with bitmaps faster in C#

You can increase the speed of both SetPixel and GetPixel by doing the following:

1. Add the line 'int step = 0' at the LockBitmap class level.
2. Remove 'int' declation of 'step' in the LockBits method and calculate as is.
3. In both SetPixel and GetPixel, remove the line:

int cCount = Depth / 8;

4. In both SetPixel and GetPixel, replace cCount with Step:

//Get start index of the specified pixel
int i = ((y * Width) + x) * cCount;

now becomes:

//Get start index of the specified pixel
int i = ((y * Width) + x) * Step;