Most of the drawing functions use typedefed gp_coord and gp_size integer types for parameters.

gp_coord is a signed integer type which is used for coordinates and gp_size is an unsigned integer type used for object size, length and so on.

A Pixel value in GFXprim is an integer wide enough to hold the actual pixel values. The default typedef for gp_pixel is set to a 32 bit integer. This may be changed at compile time to support colors with more than 10 bits per channel. gp_pixel is thus used as an opaque value big enough to hold any supported pixel value.