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- Newsgroups: comp.os.ms-windows.setup
- Path: sparky!uunet!spool.mu.edu!agate!linus!linus.mitre.org!jcmorris
- From: jcmorris@mwunix.mitre.org (Joe Morris)
- Subject: Re: Windows Screen Fonts
- Message-ID: <jcmorris.726858609@mwunix>
- Keywords: screen font windows installation
- Sender: news@linus.mitre.org (News Service)
- Nntp-Posting-Host: mwunix.mitre.org
- Organization: The MITRE Corporation
- References: <1993Jan12.151052.20204@news.uiowa.edu>
- Distribution: na
- Date: Tue, 12 Jan 1993 17:10:09 GMT
- Lines: 81
-
- ffang@grover.printing.uiowa.edu (Francis Fang) writes:
-
- >I just downloaded the Optima screen font zip file from Compuserve to use
- >on my Windows 3.1 machine running Aldus PageMaker 4.0. After unzipping
- >the file, I find that all the zip file consists of is .FON files. I then
- >proceeded to install them using the Fonts Control Panel under the Main
- >window. The installation completes and I see the Optima screen fonts in
- >the installed list of fonts. When I click on these, the sample window
- >shows me a sample of what the font looks like and at the bottm of the
- >sample window, informs me that this is a screen or plotter font.
-
- >The problem arises when I try to access the font in any other program.
- >The installed Optima screen font does not appear in any of the font
- >menus.
-
- >Is there an additional step I have not taken?
-
- Yes. You need a printer font file.
-
- This is another case where the ambiguous definitions of the word "font"
- have bitten a user. A short tutorial follows:
-
- A "printer font" is a set of glyphs which a real, physical output device
- can render on its medium (plotter, ink-on-paper, etc.). Generally, a
- printer font takes a one-byte data item and maps it to a particular
- glyph. A printer font may be built into the printer, or added to it
- via a plug-in cartridge, or downloaded as a "soft font" file from the
- attached desktop system.
-
- Although it violates the traditional use of the word "font", a printer
- font may be scalable so that "Times Roman" may represent a particular
- glyph design of any requested size.
-
- Windows is informed of the availability of a printer font by any of
- several methods: the driver may know what fonts are built into the
- particular model printer; the printer setup dialog may offer the
- opportunity to say what cartridges are installed; and soft font information
- may be present in WIN.INI.
-
- A "screen font" is exactly what its name implies: it allows you to see on
- your desktop display a representation of the glyph which it supports.
- Thus "TmsRmn" screen fonts allow the display of Times Roman-like fonts.
-
- Let's assume that you have neither TrueType nor Adobe Type Manager for
- a moment.
-
- When a Windows application asks for a list of the fonts available to it,
- the list returned to it is the set of fonts available *on the currently-
- selected printer*. The presence or absence of a screen font for some
- typeface does not affect the response to the enumeration query. Thus,
- if you have a LaserJet II with no soft fonts or cartridges installed,
- the list will show that Courier and LinePrinter are available.
-
- If the user selects one of the fonts offered by the printer and uses it in
- a screen display, the application will associate with the characters
- a particular font name, style (roman, italic, etc.), and size. When
- this data is passed to the video driver, the driver will look in the
- various screen fonts (*.FON) and will select the one which most closely
- matches the data (font, style, and size). If there is no exact match
- the selection proceeds with a documented search algorithm to find a
- substitute, which may occasionally result in wildly inappropriate
- screen rendering, especially with nonalphabetic fonts.
-
- The screen font files are bitmap patterns, and can represent only specific
- display sizes. That's why you'll see font names like "TIMESA.FON",
- "TIMESB.FON", "TIMESE.FON", etc.: the last letter distinguishes the
- font files used for CGA, EGA, and VGA in this example. Further, the
- fonts provide only a few display character sizes, so if you ask for any
- other character size you'll see incorrect character sizes displayed.
-
- So...you've got the Optima screen fonts, but all that does for you is
- allow you to see the proper glpyhs for some set of point sizes if you
- specify the Optima typeface. You still need to provide Windows with
- the necessary information about the existence and metrics of a printer
- font; only then will your applications be offered the Optima typeface.
-
- The above comments don't apply to a system with TrueType or ATM, because
- those systems will build the necessary screen font information "on-the-fly"
- as the characters are specified by the application.
-
- Joe Morris / MITRE
-