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Inside Macintosh: Imaging With QuickDraw /
Chapter 4 - Color QuickDraw / Color QuickDraw Reference
Color QuickDraw Routines

Changing the Background Pixel Pattern

Each graphics port has a background pattern that's used when an area is erased (such as by using the EraseRect procedure, described in the chapter "QuickDraw Drawing") and when pixels are scrolled out of an area (such as by using the ScrollRect procedure, described in the chapter "Basic QuickDraw"). The background pattern is stored in the bkPixPat field of every CGrafPort record. You can use the BackPixPat procedure to change the pixel pattern used as the background color by the current color graphics port.

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BackPixPat
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