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Date:	Sun, 21 Nov 2004 13:29:03 PST8
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: OS2.INI PM_Font_Drivers ?

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In <41A10259.69CC@peterskye.com>, on 11/21/04
at 01:02 PM, Peter Skye said:

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

> PMATM
> PMUNIF
> TRUETYPE

This entry lists the font classes that OS/2 can handle and the DLLs that
are responsible to processing them. I've never looked into the interface,
but it is fairly obvious what a font driver needs to do.

>But what uses these DLLs?

The Presentation Manager. What other possibilities are there?

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

No. As I discussed, the GUI subsystems provide higher level APIs. Of
course, there's nothing to stop applications from access these DLLs as
long as they know how.

>-- 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?

As I discussed, the PM_Fonts keys do encode the font type in the key
value. However, I suspect this is used to prevent collisions. I would
expect the PM subsystem to call each font driver and ask it if it
understands the font.

>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).

FWIW, Java uses the PM rendering components via a JNI interface.

>Now I want to understand how the above-mentioned DLLs fit into
>the system.

The PM knows how to use them. If you want to read code, the FreeType code
is probably a good place to start.

Steven

--
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"Steven Levine" MR2/ICE 2.60b #10183 Warp4/FP15/14.093c_W4
www.scoug.com irc.fyrelizard.com #scoug (Wed 7pm PST)
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