bool invert_region(handle device, handle region)
This function color inverts a region.
The handle of the device context.
The handle of the region to be inverted.
|true||The function succeeded.|
|false||The call failed.|
The region's coordinates are assumed to be logical coordinates.
A logical not is performed on the color values of the given region.
If this function is called twice for the same region, the region is restored to its original color.