Q: In writing a print driver, I've noticed that when I print a window
from the Finder, the icons don't show up. What gives?
A: What you've uncovered is an "optimization" in the Icon Utilities. When
drawing an icon, rather than going through the standard bottlenecks,
the Icon Utilities use CopyMask. This is true unless you're saving to a pict or drawing
to a port they recognize as a printing port (by the print driver setting a low-memory
global, which is underdocumented).
The following two macros tell the Icon Utilities to use CopyBits
instead of using CopyMask. Call setPrinting in your PrOpenPage function and call
clearPrinting in your PrClosePage function, and all should be well.
#define setPrinting {*((short *)0x948) = 0;}
#define clearPrinting {*((short *)0x948) = -1;}
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