Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /

Chapter 4 - Printing Messages / Printing Messages Reference

Constants and Data Types for the Vector Imaging System

Vector Halftone Structure

The vector halftone structure, of data type gxVHalftoneRec, defines the halftone information for a vector device. This structure is used with the vector imaging system structure, which is described on page 4-32.

struct gxVHalftoneRec {
   gxColorSpace         halftoneSpace;
   gxHalftoneCompRec    halftoneComps[4];
   long                 penIndexForBW;
};
typedef struct gxVHalftoneRec gxVHalftoneRec;

Field Description

halftoneSpace

The color space for this device. The color-space value constants are shown in the chapter "Colors and Color-Related Objects" in Inside Macintosh: QuickDraw GX Objects.

halftoneComps

An array of vector halftone component structures. This array has four entries, one for each color component. The vector halftone component structure is described in the next section.

penIndexForBw

The pen index for drawing 1-bit deep or black-and-white bitmaps.

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