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Date:	Sun, 21 Nov 2004 13:02:33 PST8
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: OS2.INI PM_Font_Drivers ?

Content Type: text/plain

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Steven, thanks for an excellent presentation yesterday on OS/2 fonts.

I have a question. What are the PM_Font_Drivers entries
("Applications") in OS2.INI? I have

PMATM
PMUNIF
TRUETYPE

(Lurkers: Open OS2.INI with UniMaint or your favorite INI editor and
look at PM_Fonts_Drivers.)

The values for these three entries are the paths (without drive letter)
to three DLLs with corresponding names. It's obvious these are
rendering engines -- the ATM DLL is very large indicating a lot of logic
goes into creating Adobe characters, the TrueType DLL is mid-size and
thus indicates that there is much less logic involved when rendering
TTF, and the UNIF DLL is small so it must handle "no logic" bitmap
characters.

But what uses these DLLs?

-- Does each program which uses fonts have to call one or more of these
DLLS, or are they only used by the operating system?

-- What determines which DLL to use for a particular font? When a new
font is selected, are all three DLLs called and asked if the DLL can
handle it? Or is there another OS2.INI entry somewhere that correlates
font file extensions to the DLLs?

I understand the font format vector (ATM, TTF, FON-bitmap). I
understand that there are different rendering platforms (PM, Java,
possibly Win-OS/2 and XFree86). I understand you have to install each
desired font to each desired rendering platform (i.e. into OS2.INI ->
PM_Fonts for PM/WPS usage). Now I want to understand how the
above-mentioned DLLs fit into the system.

- Peter

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