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``dvi.doc''
Mon 27 Feb 1995
Geoffrey Tobin
Description of the DVI file structure.
--------------------------------------
Reference:
----------
CTAN: dviware/driv-standard/level-0/dvistd0.tex
"The DVI Driver Standard, Level 0",
by The TUG DVI Driver Standards Committee (now defunct)
chaired by Joachim Schrod.
Appendix A, "Device-Independent File Format",
section A.2, "Summary of DVI commands".
DVI Commands
------------
Listed in the free format:
"Opcode Symbol Parameter[Signed? Bytes] ... Action".
0 set_char_0 - set character 0 from current font
...
127 set_char_127 - set character 127 from current font
128 set1 c[1] - set 1-byte unsigned character (uchar) number c
129 set2 c[2] - set 2-byte uchar number c
130 set3 c[3] - set 3-byte uchar number c
131 set4 c[+4] - set 4-byte signed character (schar) number c
132 set_rule a[+4] b[+4] - set rule, height a, width b
133 put1 c[1] - put 1-byte uchar c
134 put2 c[2] - put 2-byte uchar
135 put3 c[3] - put 3-byte uchar
136 put4 c[+4] - put 4-byte schar
137 put_rule a[+4] b[+4] - put rule, height a, width b
138 nop - do nothing
139 bop c0[+4] ... c9[+4] p[+4] - beginning of page
140 eop - end of page
141 push - push (h,v,w,x,y,z) onto stack
142 pop - pop (h,v,w,x,y,z) from stack
143 right1 b[+1] - move right b units
144 right2 b[+2] - move right b units
145 right3 b[+3] - move right b units
146 right4 b[+4] - move right b units
147 w0 - move right w units
148 w1 b[+1] - move right b units, and set w = b
149 w2 b[+2] - move right b units, and set w = b
150 w3 b[+3] - move right b units, and set w = b
151 w4 b[+4] - move right b units, and set w = b
152 x0 - move right x units
153 x1 b[+1] - move right b units, and set x = b
154 x2 b[+2] - move right b units, and set x = b
155 x3 b[+3] - move right b units, and set x = b
156 x4 b[+4] - move right b units, and set x = b
157 down1 a[+1] - move down a units
158 down2 a[+2] - move down a units
159 down3 a[+3] - move down a units
160 down4 a[+4] - move down a units
161 y0 - move right y units
162 y1 a[+1] - move right a units, and set y = a
163 y2 a[+2] - move right a units, and set y = a
164 y3 a[+3] - move right a units, and set y = a
165 y4 a[+4] - move right a units, and set y = a
166 z0 - move right z units
167 z1 a[+1] - move right a units, and set z = a
168 z2 a[+2] - move right a units, and set z = a
169 z3 a[+3] - move right a units, and set z = a
170 z4 a[+4] - move right a units, and set z = a
171 fnt_num_0 - set current font number (f) = 0
...
234 fnt_num_63 - set f = 63
235 fnt1 k[1] - set f = k
236 fnt2 k[2] - set f = k
237 fnt3 k[3] - set f = k
238 fnt4 k[+4] - set f = k
239 xxx1 k[1] x[k] - special string x with k bytes
240 xxx2 k[2] x[k] - special string x with k bytes
241 xxx3 k[3] x[k] - special string x with k bytes
242 xxx4 k[4] x[k] - special string x with (unsigned) k bytes
243 fnt_def1 k[1] c[4] s[4] d[4] a[1] l[1] n[a+l] - define font k
244 fnt_def2 k[2] c[4] s[4] d[4] a[1] l[1] n[a+l] - define font k
245 fnt_def3 k[3] c[4] s[4] d[4] a[1] l[1] n[a+l] - define font k
246 fnt_def4 k[+4] c[4] s[4] d[4] a[1] l[1] n[a+l] - define font k
247 pre i[1] num[4] den[4] mag[4] k[1] x[k] - begin preamble
248 post p[4] num[4] den[4] mag[4] l[4] u[4] s[2] t[2] - begin postamble
249 post_post q[4] i[1] 223 ... 223 - end postamble
250 - undefined
...
255 - undefined
In bop:
c0[+4] ... c9[+4] = page counters, \`a la TeX.
p[+4] = pointer to previous bop (its byte address); first bop has p = -1 .
In the font definitions:
c[4] = check sum for TFM file.
s[4] = scale factor, in DVI units.
d[4] = design size, in DVI units.
a[1] = length of the "area" or directory.
l[1] = length of the font name.
n[a+l] = area and font name string(s).
In the preamble:
i[1] = DVI format ID = 2, except TeX-XeT has 3.
num[4] = numerator of 100 nm / DVI unit.
den[4] = denominator of 100 nm / DVI unit.
mag[4] = 1000 * magnification.
k[1] = comment length.
x[k] = comment string.
In the postamble:
p[4] = pointer to final bop.
num[4], den[4], mag[4] = duplicates of values in preamble.
l[4] = height-plus-depth of tallest page, in DVI units.
u[4] = width of widest page, in DVI units.
s[2] = maximum stack depth needed to process this DVI file.
t[2] = total number of pages (bop commands) present.
In the post-postamble:
q[4] = pointer to the "post" command that started the postamble.
i[1] = DVI format ID, as in the preamble.
223 ... 223 = at least four "223" bytes.
---------------
EOF ``dvi.doc''
---------------
|
