Providing Compatibility in the ImageWriter II Driver(IM:XP)

Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /: Chapter 3 - Printer Drivers / The QuickDraw GX ImageWriter II Printer Driver Messages

Providing Compatibility in the ImageWriter II Driver
This section describes the override functions that comprise the portion of the ImageWriter II printer driver that provides compatibility with the Macintosh Printing Manager. This portion of the driver needs to override any of the Printing Manager compatibility messages that must take into account specific characteristics of the printing device. The functions that override such messages include the following:

The SD_ConvertPrintRecordTo function uses knowledge of the ImageWriter printer characteristics to convert an old print record into a universal print structure.
The SD_ConvertPrintRecordFrom function converts a universal print structure into Macintosh Printing Manager print record for the ImageWriter II.
The SD_PrintRecordToJob function forwards the GXPrintRecordToJob message and then converts one of the resultant settings into an option in the job collection that is used by the driver.
The SD_PrValidate function validates the current print record by filling it in with the current settings for the application and printing device.
The SD_PrJobInit function first forwards the GXPrJobInit message to display the default settings in the Print dialog box, then disables some of the items, based on the current settings for the printing device.

All of the Macintosh Printing Manager compatibility messages, including those that correspond to these override functions, are described in the section "Compatibility Messages" beginning on page 4-147 in the chapter "Printing Messages." The code for the overrides used by the ImageWriter II printer driver is found in the QuickDraw GX sample code.