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POSTSCRI
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TEXPS.LPR
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1990-11-25
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% PostScript prolog for using resident fonts.
% No change is made to the encoding scheme, since `virtual fonts' do that
% better. All we do is change the widths so that PostScript positioning
% matches the assumptions of dvips.
% The calling sequence defining font foo to be resident font Bar is
% /foo [wd0 wd1 ... wd255] /Bar mag atsize rf
% where each character width wdi is in pixels,
% mag is the magnification per thousand,
% and atsize is the desired font size in TeX scaled points (sp).
%
TeXDict begin
%
/rf {
655360 div mul Resolution mul 7227 div /PixPerEm X % compute pixels/em
% We copy everything but the FID entry of the resident font
% (just as in section 5.7 of the Red Book)
findfont
dup length 1 add dict /nn X
{1 index /FID ne
{nn 3 1 roll put}
{pop pop}
ifelse
} forall
% Now the top entry on the stack is the array of pixel widths.
% We convert them to PostScript's milli-em units, and put them
% in a Metrics dictionary.
256 dict begin
nn /Encoding get
0 1 255 {
2 copy get
3 index 2 index get
1000 mul PixPerEm div N pop
} for
pop pop
nn /Metrics currentdict put end
% Finally we associate the new font with a name like ZZfoo@,
% using conventions identical to those of downloaded bitmap fonts.
/fontname X
% dmystr 2 fontname cvx (@@@@) cvs putinterval % put name in template
/nn dup nn definefont
[PixPerEm 0 0 PixPerEm neg 0 0] makefont N
fontname { /foo setfont } % dummy macro to be filled in
2 array copy cvx N % have to allocate a new one
fontname load % now we change it
% 0 dmystr 6 string copy % get a copy of the font name
0 nn put % get the actual dictionary
% cvn cvx put % and stick it in the dummy macro
} B
%
% Now here's some oblique hackery... an example of making
% variants of a resident font look like it is resident.
% Say, e.g., /Times-Slanted /Times-Roman .167 SlantFont
% to make /Times-Slanted a font with slant of 1/6;
% or /Times-Extended /Times-Roman 1.05 ExtendFont
% to make a font that's 5% wider.
% Optionally replace the `slant' by `angle ObliqueSlant';
% note that the ObliqueSlant of Times-Italic is -15.5 (negative).
%
/ObliqueSlant { % angle ObliqueSlant slant
dup sin S cos div neg
} B
/SlantFont { % fontname basefontname slant SlantFont pseudoresfontname
/foo X
[1 0 foo 1 0 0] TransFont
} B
/ExtendFont { % widtharray fontname basefontname factor ExtendFont
% widtharray' pseudoresfontname
/foo X
3 2 roll [ S {foo div} forall ] % divide each width entry by the factor
3 1 roll [foo 0 0 1 0 0] TransFont
} B
% Note: After Times-Slanted is declared once as a SlantFont, you can
% use it again without redeclaring its relation to Times-Roman.
% But this doesn't work with Times-Extended, because you have to
% recompute the widths for each incarnation of Times-Extended.
% In fact, strictly speaking, it doesn't work even with Times-Slanted,
% because the widths are rounded differently at different sizes.
% Therefore dvips repeats the special instructions each time.
/TransFont { % fontname basefontname matrix TransFont pseudoresfontname
S findfont S makefont
dup length dict /nn X
{1 index /FID ne
{nn 3 1 roll put}
{pop pop}
ifelse
} forall
dup nn definefont pop
} B
%
end