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Amiga bitmapped font builder
============================
MkBmap V1.2 Copyright Adrian Aylward 1991
You may freely copy, use, and modify this program. The source is included
in the distribution.
This program builds Amiga format bitmapped fonts from PostScript fonts.
It uses the library "post.library" to render the characters. This is
included in the PostScript interpreter package "Post" that is freely
distributable on the Amiga.
Best results will be obtained by using fully hinted type 1 fonts, such as
those supplied by Adobe and other vendors. It should however work with
any other PostScript fonts, though the quality will not be so high.
Command line interface
======================
usage:
mkbmap -options bmapfile fontname nn,nn,...
options:
-s startupfile
The PostScript library startup file name. Default
"PSFonts:init.ps".
-e encodingfile
The character set encoding file. Default
"PSFonts:encoding.ps".
-f Use font specific encoding - for fonts such as "Symbol"
where the character names are non-standard.
-n Make new .font contents file. Updates the font directory
information, like running the FixFonst program, but updating
just the particular font.
-dnnn Set the density, in dots per inch, both x and y directions.
Default is 75 dpi..
-xnnn Set the x density.
-ynnn Set the y density.
-znnn Set the baseline, in units of 1/1000 of the pixel height.
Default automatically accomodates the descenders.
-wnnn Set the nominal character width, in units of 1/1000 of the
character cell. Default is the average width of all the
characters.
-lnnn Set LoChar, the lowest character code value in the font.
Default 32.
-hnnn Set HiChar, the highest character code value in the font.
Default 255.
-c Clip characters to their width, so that overhanging
sidebearings are truncated.
-m Flag the font as monospaced, i.e. not proportionally
spaced. Should only be used if all the characters in the
font actually are the same width, e.g. Courier.
-b Set Bold style flag.
-i Set Italic style flag.
-t Turn trace on, for debugging.
The "bmapfile" argument is the name of the bitmapped font file to be created.
So that more than one size can be created at once, the name can be specified
as a prototype. Any "*" characters are replaced by the point size, and any
"?" characters are replaced by teh individual digits. For example if we
generate 9 and 10 point then "fonts:fred/*" will become "fonts:fred/9" and
"fonts:fred/10"; "t:fred??" wil become "t:fred09" and "t:fred10".
The "fontname" is the PostScript font name, for example "Palatino-Roman".
The last argument is the list of point sizes to be generated, for example
"10,12,24". The minimum size allowed is 5, and the maxium 500 - if you
have enough memory.
Normally, all three arguments are required. However, if just the first
argument is given then the "-n" option may be used to update the font
contents.
For example:
mkbmap -n fonts:Times/* Times-Roman 10,12,14
Creates bitmapped versions of the "Times" font in the current fonts
directory, updating the font contents file "fonts:Times.font" so they
become immediately available to the system.
mkbmap t:Times24 Times-Roman 24
Creates a bitmapped 24 point "Times" in the temporary directory. If
you then copy it into the fonts: directory:
copy t:Times24 fonts:Times/24
you must then either run FixFonts or use mkbmap to update the font contents:
mkbmap -n fonts:Times/
The font is now available for use. N.B. the trailing "/" on the path name
must not be omitted; otherwise it will be looking for individual bitmaps
within the fonts:directory, rather than in the Times subdirsctory.
If you use the "-n" option, the font subdirectory will be created
automatically if necessary.
Character sizes
===============
The size list is the heights of the generated bitmaps, in pixels. This is
also the point size (in PostScript terminology) at the chosen resolution.
When characters are rendered at 75 dpi. (the default) the alphabet normally
fits satisfactorily into the pixel height. However the upper case accented
characters are normally too large to fit, so are scaled down. Excessively
long descenders are scaled too. This can lead to a slightly ragged look on
the screen, but fortunately these characters are rarely used.
Alternatively, you can adjust the density to make the charecters fit. At
about 60dpi. even the tallest characers should be OK. But the characters
may then look too small in relation to the line spacing.
If you are generating a font for a screen where the pixels are not
approximately square (such as high-res, non-interlaced) you can set the
x and y density separately.
Professional Page renders its screen at 75 dpi., so you should normally use
the default density when generating fonts for it.
The baseline is normally positioned automatically, so the alphabetic
descenders just fit. If you prefer you can set it yourself; values of
200 - 250 are about right (1/5 to 1/4 of the pixels below the baseline.
The Xsize (nominal width) is automatically set to the average width of
the characters generated. You can set it yourself from the command line;
values will typically range from 300 to 700 (in 1/1000 character space
coordinates used by Adobe).
Versions
========
V1.0 03-May-91
The original.
V1.1 04-May-91
Rendering code changed so as not to clip characters by default. New -c
option to enable old behaviour.
V1.2 13-May-91
Bugs fixed: -s and -e options, characters with negative sidebearings.