The CalculateOffset function seems to have some redundant terms

[acushway]

The following two while loops have the same test being performed twice. Makes me wonder if there was supposed to be some other test on the right hand side:

while (x + width <= bottomRightX || x + width <= bottomRightX)
{
    x++;
}

while (y + height <= bottomRightY || y + height <= bottomRightY)
{
    y++;
}