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Important for all Apple Printing and Graphics Developers:
The information in this Technical Q & A is still relevant up to and including
Mac OS 7.6
with QuickDraw GX 1.1.5. Beginning with the release of Mac OS 8.0,
however, Apple plans to deliver a system which incorporates QuickDraw GX
graphics and typography only. QuickDraw GX printer drivers and GX printing
extensions will not be supported in Mac OS 8.0 or in future Mac OS releases. Apple's
goal is to simplify the user experience of printing by unifying the Macintosh
graphic and printing architectures and standardizing on the classic Printing
Manager.
For details on Apple's official announcement, refer to
</dev/technotes/gxchange.html>
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Q: Does QuickDraw GX send the DoesPaperFit message when I'm setting up
input-tray dialogs, or is the driver supposed to do this? If GX doesn't, it is
possible for users to use completely invalid paper sizes, which can violently
crash most raster drivers.
A: GX sends the DoesPaperFit message in the default implementation of the Input
Trays... dialog to constrain the configuration options, and drivers that
perform their own Input Trays... dialog should do the same. A driver should
override this message if it needs other than the default logic, which responds
that everything fits.
The packing buffer size specified in the 'rpck' resource is set to the expected
maximum size needed. Unfortunately, this is far smaller than what's needed when
handling larger-than-expected paper sizes. To work around this, you can set the
packing buffer size so that it can accommodate the largest paper size the
printer can use.
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