Inside Macintosh: QuickDraw GX Objects /

Chapter 7 - View-Related Objects / View-Related Objects Reference

View Port Functions / Manipulating View Port Object Properties

GXGetViewPortHalftone

You can use the GXGetViewPortHalftone function to examine the halftone property of a view port object.

boolean GXGetViewPortHalftone(gxViewPort source, 
                              gxHalftone *data);

source

A reference to the view port whose halftone you wish to examine.

data

A pointer to a halftone structure. On return, the structure contains the view port's halftone information.

function result

true if the halftone exists; otherwise false.

DESCRIPTION

The GXGetViewPortHalftone function copies the view port's halftone into the structure you provide, pointed to by the data parameter. If a halftone does not exist,
the contents of the structure pointed to by the data parameter are not changed.

ERRORS, WARNINGS, AND NOTICES

Errors
invalid_viewPort_reference

SEE ALSO

For information about the halftone property, see "Halftone" beginning on page 7-13.

To set the halftone of a view port, use the GXSetViewPortHalftone function, described next.