Raster operations, often referred to as ROPS, are rules for determining which pixels should be drawn and in what order. The rasterization module converts and interprets surface and scene information into the actual pixels that are displayed. How the module determines which pixels belong where and what color they should be relative to the source and destination images depends on the raster operations that are specified for the transfer. The standard raster operation codes can be found in the Win32 API. Other raster operations may be specified if they are supported by the hardware.