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