Inside Macintosh: QuickDraw GX Printing /

Chapter 3 - Page Formatting and Dialog Box Customization / Page Formatting and Dialog Box Customization Reference

Constants and Data Types for Format Collection Items

Format-Halftone Information

The collection item ID for halftone information is defined in the halftone information enumeration:

enum { gxFormatHalftoneTag = 'half' };  

QuickDraw GX stores halftone information in the gxFormatHalftoneInfo structure:

struct gxFormatHalftoneInfo {
   long  numHalftones;              
   gxHalftone  halftones[1];        
};

Field Description

numHalftones

The number of halftones in the structure.

halftones

The halftones to use when rendering a page with this format.

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