Refactor: Rename zwidth to zoom_box_width
Refactor: Rename zdepth to zoom_box_height
Refactor: Rename zskew to zoom_box_skew
Refactor: Eliminate code needed due to memory aliasing
Refactor: Localize variables
Refactor: Reformat lines
Refactor: Rename NUM_BOXES to NUM_BOX_POINTS
Refactor: Replace _ASSERTE with assert
Refactor: Localize variables
Fix zoom box/image outline box problems
Refactor: Declare unchanging quantities const
Refactor: Rename dxsize to x_size_d
Refactor: Rename dysize to y_size_d
Refactor: Inline macro/function