The Imaging System ('isys') Resource(IM:XP)

Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /

Chapter 6 - Printing Resources / Printing Resources Reference

Resources Used Only in Printer Drivers

The Imaging System ('isys') Resource
The imaging system resource, of type gxImagingSystemSelectorType, tells QuickDraw GX which imaging system a driver uses. You must include an imaging system resource in your driver file. Figure 6-9 shows the structure of an imaging system resource, which consists of one value.
Figure 6-9 The imaging system resource

Imaging system type. The imaging system with which your driver operates. This value is specified in your resource files as a four-character imaging system name, for which you can use the imaging system constants that are shown in Table 6-8 on page 6-27. Note that you cannot specify the gxAnyPrinterType value in this resource.

The imaging system resource ID needs to be the constant gxImagingSystemSelectorID. Listing 6-8 shows an example of an imaging system resource.
Listing 6-8 An example of an imaging system resource
resource gxImagingSystemSelectorType (gxImagingSystemSelectorID,
                                             sysHeap, purgeable)
{
   gxRasterPrinterType
};
This resource tells QuickDraw GX that the driver uses the raster imaging system.