| 1 | ;;; ps-bdf.el --- BDF font file handler for ps-print. |
| 2 | |
| 3 | ;; Copyright (C) 1998,99,2001 Electrotechnical Laboratory, JAPAN. |
| 4 | ;; Licensed to the Free Software Foundation. |
| 5 | |
| 6 | ;; Keywords: wp, BDF, font, PostScript |
| 7 | ;; Maintainer: Kenichi Handa <handa@etl.go.jp> |
| 8 | ;; Time-stamp: <2001/03/05 09:04:32 vinicius> |
| 9 | |
| 10 | ;; This file is part of GNU Emacs. |
| 11 | |
| 12 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
| 13 | ;; it under the terms of the GNU General Public License as published by |
| 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
| 15 | ;; any later version. |
| 16 | |
| 17 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | ;; GNU General Public License for more details. |
| 21 | |
| 22 | ;; You should have received a copy of the GNU General Public License |
| 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
| 24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 25 | ;; Boston, MA 02111-1307, USA. |
| 26 | |
| 27 | ;;; Commentary: |
| 28 | |
| 29 | ;; Functions for getting bitmap information from X's BDF font file are |
| 30 | ;; provided. |
| 31 | |
| 32 | ;;; Code: |
| 33 | |
| 34 | (eval-and-compile |
| 35 | (require 'ps-mule) |
| 36 | |
| 37 | ;; to avoid XEmacs compilation gripes |
| 38 | (defvar installation-directory nil) |
| 39 | (defvar coding-system-for-read nil)) |
| 40 | |
| 41 | ;;;###autoload |
| 42 | (defvar bdf-directory-list |
| 43 | (if (and (memq system-type '(ms-dos windows-nt)) |
| 44 | (boundp 'installation-directory)) |
| 45 | (list (expand-file-name "fonts/bdf" installation-directory)) |
| 46 | '("/usr/local/share/emacs/fonts/bdf")) |
| 47 | "*List of directories to search for `BDF' font files. |
| 48 | The default value is '(\"/usr/local/share/emacs/fonts/bdf\").") |
| 49 | |
| 50 | ;; MS-DOS and MS-Windows users like to move the binary around after |
| 51 | ;; it's built, but the value above is computed at load-up time. |
| 52 | (and (and (memq system-type '(ms-dos windows-nt)) |
| 53 | (boundp 'installation-directory)) |
| 54 | (setq bdf-directory-list |
| 55 | (list (expand-file-name "fonts/bdf" installation-directory)))) |
| 56 | |
| 57 | (defun bdf-expand-file-name (bdfname) |
| 58 | "Return an absolute path name of a `BDF' font file BDFNAME. |
| 59 | It searches directories listed in the variable `bdf-directory-list' |
| 60 | for BDFNAME." |
| 61 | (if (file-name-absolute-p bdfname) |
| 62 | (and (file-readable-p bdfname) |
| 63 | bdfname) |
| 64 | (let ((dir-list bdf-directory-list) |
| 65 | dir) |
| 66 | (while (and dir-list |
| 67 | (progn |
| 68 | (setq dir (expand-file-name bdfname (car dir-list))) |
| 69 | (not (file-readable-p dir)))) |
| 70 | (setq dir nil |
| 71 | dir-list (cdr dir-list))) |
| 72 | dir))) |
| 73 | |
| 74 | (defsubst bdf-file-mod-time (filename) |
| 75 | "Return modification time of FILENAME. |
| 76 | The value is a list of two integers, the first integer has high-order |
| 77 | 16 bits, the second has low 16 bits." |
| 78 | (nth 5 (file-attributes filename))) |
| 79 | |
| 80 | (defun bdf-file-newer-than-time (filename mod-time) |
| 81 | "Return non-nil if and only if FILENAME is newer than MOD-TIME. |
| 82 | MOD-TIME is a modification time as a list of two integers, the first |
| 83 | integer has high-order 16 bits, the second has low 16 bits." |
| 84 | (let ((file-name (bdf-expand-file-name filename))) |
| 85 | (and file-name |
| 86 | (let* ((new-mod-time (bdf-file-mod-time file-name)) |
| 87 | (new-time (car new-mod-time)) |
| 88 | (time (car mod-time))) |
| 89 | (or (> new-time time) |
| 90 | (and (= new-time time) |
| 91 | (> (nth 1 new-mod-time) (nth 1 mod-time)))))))) |
| 92 | |
| 93 | (defun bdf-find-file (bdfname) |
| 94 | "Return a buffer visiting a bdf file BDFNAME. |
| 95 | If BDFNAME is not an absolute path, directories listed in |
| 96 | `bdf-directory-list' is searched. |
| 97 | If BDFNAME doesn't exist, return nil." |
| 98 | (let ((file-name (bdf-expand-file-name bdfname))) |
| 99 | (and file-name |
| 100 | (let ((buf (generate-new-buffer " *bdf-work*")) |
| 101 | (coding-system-for-read 'no-conversion)) |
| 102 | (save-excursion |
| 103 | (set-buffer buf) |
| 104 | (insert-file-contents file-name) |
| 105 | buf))))) |
| 106 | |
| 107 | (defvar bdf-cache-file (convert-standard-filename "~/.bdfcache.el") |
| 108 | "Name of cache file which contains information of `BDF' font files.") |
| 109 | |
| 110 | (defvar bdf-cache nil |
| 111 | "Cached information of `BDF' font files. It is a list of FONT-INFO. |
| 112 | FONT-INFO is a list of the following format: |
| 113 | (BDFFILE ABSOLUTE-PATH MOD-TIME SIZE FONT-BOUNDING-BOX |
| 114 | RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR) |
| 115 | See the documentation of the function `bdf-read-font-info' for more detail.") |
| 116 | |
| 117 | (defun bdf-read-cache () |
| 118 | "Return a cached information about `BDF' font files from a cache file. |
| 119 | The variable `bdf-cache-file' holds the cache file name. |
| 120 | If the cache file is not readable, this return nil." |
| 121 | (setq bdf-cache nil) |
| 122 | (condition-case nil |
| 123 | (and (file-readable-p bdf-cache-file) |
| 124 | (progn |
| 125 | (load-file bdf-cache-file) |
| 126 | (if (listp bdf-cache) |
| 127 | bdf-cache |
| 128 | (setq bdf-cache nil)))) |
| 129 | (error nil))) |
| 130 | |
| 131 | (defun bdf-write-cache () |
| 132 | "Write out cached information of `BDF' font file to a file. |
| 133 | The variable `bdf-cache-file' holds the cache file name. |
| 134 | The file is written if and only if the file already exists and writable." |
| 135 | (and bdf-cache |
| 136 | (file-exists-p bdf-cache-file) |
| 137 | (file-writable-p bdf-cache-file) |
| 138 | (write-region (format "(setq bdf-cache '%S)\n" bdf-cache) |
| 139 | nil bdf-cache-file))) |
| 140 | |
| 141 | (defun bdf-set-cache (font-info) |
| 142 | "Cache FONT-INFO as information about one `BDF' font file. |
| 143 | FONT-INFO is a list of the following format: |
| 144 | (BDFFILE ABSOLUTE-PATH MOD-TIME SIZE FONT-BOUNDING-BOX |
| 145 | RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR) |
| 146 | See the documentation of the function `bdf-read-font-info' for more detail." |
| 147 | (let ((slot (assoc (car font-info) bdf-cache))) |
| 148 | (if slot |
| 149 | (setcdr slot (cdr font-info)) |
| 150 | (setq bdf-cache (cons font-info bdf-cache))))) |
| 151 | |
| 152 | (defun bdf-initialize () |
| 153 | "Initialize `bdf' library." |
| 154 | (and (bdf-read-cache) |
| 155 | (add-hook 'kill-emacs-hook 'bdf-write-cache))) |
| 156 | |
| 157 | (defun bdf-compact-code (code code-range) |
| 158 | (if (or (< code (aref code-range 4)) |
| 159 | (> code (aref code-range 5))) |
| 160 | (setq code (aref code-range 6))) |
| 161 | (+ (* (- (lsh code -8) (aref code-range 0)) |
| 162 | (1+ (- (aref code-range 3) (aref code-range 2)))) |
| 163 | (- (logand code 255) (aref code-range 2)))) |
| 164 | |
| 165 | (defun bdf-expand-code (code code-range) |
| 166 | (let ((code0-range (1+ (- (aref code-range 3) (aref code-range 2))))) |
| 167 | (+ (* (+ (/ code code0-range) (aref code-range 0)) 256) |
| 168 | (+ (% code code0-range) (aref code-range 2))))) |
| 169 | |
| 170 | (defun bdf-search-and-read (match limit) |
| 171 | (goto-char (point-min)) |
| 172 | (and (search-forward match limit t) |
| 173 | (progn |
| 174 | (goto-char (match-end 0)) |
| 175 | (read (current-buffer))))) |
| 176 | |
| 177 | (defun bdf-read-font-info (bdfname) |
| 178 | "Read `BDF' font file BDFNAME and return information (FONT-INFO) of the file. |
| 179 | FONT-INFO is a list of the following format: |
| 180 | (BDFFILE ABSOLUTE-PATH MOD-TIME FONT-BOUNDING-BOX |
| 181 | RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR) |
| 182 | |
| 183 | BDFFILE is a name of a font file (excluding directory part). |
| 184 | |
| 185 | ABSOLUTE-PATH is an absolute path of the font file. |
| 186 | |
| 187 | MOD-TIME is last modification time as a list of two integers, the |
| 188 | first integer has high-order 16 bits, the second has low 16 bits. |
| 189 | |
| 190 | SIZE is a size of the font. This value is got from SIZE record of the |
| 191 | font. |
| 192 | |
| 193 | FONT-BOUNDING-BOX is the font bounding box as a list of four integers, |
| 194 | BBX-WIDTH, BBX-HEIGHT, BBX-XOFF, and BBX-YOFF. |
| 195 | |
| 196 | RELATIVE-COMPOSE is an integer value of the font's property |
| 197 | `_MULE_RELATIVE_COMPOSE'. If the font doesn't have this property, the |
| 198 | value is 0. |
| 199 | |
| 200 | BASELINE-OFFSET is an integer value of the font's property |
| 201 | `_MULE_BASELINE_OFFSET'. If the font doesn't have this property, the |
| 202 | value is 0. |
| 203 | |
| 204 | CODE-RANGE is a vector of minimum 1st byte, maximum 1st byte, minimum |
| 205 | 2nd byte, maximum 2nd byte, minimum code, maximum code, and default |
| 206 | code. For 1-byte fonts, the first two elements are 0. |
| 207 | |
| 208 | MAXLEN is a maximum bytes of one glyph information in the font file. |
| 209 | |
| 210 | OFFSET-VECTOR is a vector of a file position which starts bitmap data |
| 211 | of the glyph in the font file. |
| 212 | |
| 213 | Nth element of OFFSET-VECTOR is a file position for the glyph of code |
| 214 | CODE, where N and CODE are in the following relation: |
| 215 | (bdf-compact-code CODE) => N, (bdf-expand-code N) => CODE" |
| 216 | (let* ((absolute-path (bdf-expand-file-name bdfname)) |
| 217 | (buf (and absolute-path (bdf-find-file absolute-path))) |
| 218 | (maxlen 0) |
| 219 | (relative-compose 'false) |
| 220 | (baseline-offset 0) |
| 221 | size |
| 222 | font-bounding-box |
| 223 | default-char |
| 224 | code-range |
| 225 | offset-vector) |
| 226 | (if buf |
| 227 | (message "Reading %s..." bdfname) |
| 228 | (error "BDF file %s doesn't exist" bdfname)) |
| 229 | (unwind-protect |
| 230 | (save-excursion |
| 231 | (set-buffer buf) |
| 232 | (goto-char (point-min)) |
| 233 | (search-forward "\nFONTBOUNDINGBOX") |
| 234 | (setq font-bounding-box |
| 235 | (vector (read (current-buffer)) (read (current-buffer)) |
| 236 | (read (current-buffer)) (read (current-buffer)))) |
| 237 | ;; The following kludgy code is to avoid bugs of fonts |
| 238 | ;; jiskan16.bdf and jiskan24.bdf distributed with X. |
| 239 | ;; They contain wrong FONTBOUNDINGBOX. |
| 240 | (and (> (aref font-bounding-box 3) 0) |
| 241 | (string-match "jiskan\\(16\\|24\\)" bdfname) |
| 242 | (aset font-bounding-box 3 |
| 243 | (- (aref font-bounding-box 3)))) |
| 244 | |
| 245 | (goto-char (point-min)) |
| 246 | (search-forward "\nSIZE ") |
| 247 | (setq size (read (current-buffer))) |
| 248 | ;; The following kludgy code is t avoid bugs of several |
| 249 | ;; fonts which have wrong SIZE record. |
| 250 | (and (<= size (/ (aref font-bounding-box 1) 3)) |
| 251 | (setq size (aref font-bounding-box 1))) |
| 252 | |
| 253 | (setq default-char (bdf-search-and-read "\nDEFAULT_CHAR" nil)) |
| 254 | |
| 255 | (search-forward "\nSTARTCHAR") |
| 256 | (forward-line -1) |
| 257 | (let ((limit (point))) |
| 258 | (setq relative-compose |
| 259 | (or (bdf-search-and-read "\n_MULE_RELATIVE_COMPOSE" limit) |
| 260 | 'false) |
| 261 | baseline-offset |
| 262 | (or (bdf-search-and-read "\n_MULE_BASELINE_OFFSET" limit) |
| 263 | 0))) |
| 264 | |
| 265 | (let ((min-code0 256) (min-code1 256) (min-code 65536) |
| 266 | (max-code0 0) (max-code1 0) (max-code 0) |
| 267 | glyph glyph-list code0 code1 code offset) |
| 268 | |
| 269 | (while (search-forward "\nSTARTCHAR" nil t) |
| 270 | (setq offset (line-beginning-position)) |
| 271 | (search-forward "\nENCODING") |
| 272 | (setq code (read (current-buffer)) |
| 273 | code0 (lsh code -8) |
| 274 | code1 (logand code 255) |
| 275 | min-code (min min-code code) |
| 276 | max-code (max max-code code) |
| 277 | min-code0 (min min-code0 code0) |
| 278 | max-code0 (max max-code0 code0) |
| 279 | min-code1 (min min-code1 code1) |
| 280 | max-code1 (max max-code1 code1)) |
| 281 | (search-forward "ENDCHAR") |
| 282 | (setq maxlen (max maxlen (- (point) offset)) |
| 283 | glyph-list (cons (cons code offset) glyph-list))) |
| 284 | |
| 285 | (setq code-range |
| 286 | (vector min-code0 max-code0 min-code1 max-code1 |
| 287 | min-code max-code (or default-char min-code)) |
| 288 | offset-vector |
| 289 | (make-vector (1+ (bdf-compact-code max-code code-range)) |
| 290 | nil)) |
| 291 | |
| 292 | (while glyph-list |
| 293 | (setq glyph (car glyph-list) |
| 294 | glyph-list (cdr glyph-list)) |
| 295 | (aset offset-vector |
| 296 | (bdf-compact-code (car glyph) code-range) |
| 297 | (cdr glyph))))) |
| 298 | |
| 299 | (kill-buffer buf)) |
| 300 | (message "Reading %s...done" bdfname) |
| 301 | (list bdfname absolute-path (bdf-file-mod-time absolute-path) |
| 302 | size font-bounding-box relative-compose baseline-offset |
| 303 | code-range maxlen offset-vector))) |
| 304 | |
| 305 | (defsubst bdf-info-absolute-path (font-info) (nth 1 font-info)) |
| 306 | (defsubst bdf-info-mod-time (font-info) (nth 2 font-info)) |
| 307 | (defsubst bdf-info-size (font-info) (nth 3 font-info)) |
| 308 | (defsubst bdf-info-font-bounding-box (font-info) (nth 4 font-info)) |
| 309 | (defsubst bdf-info-relative-compose (font-info) (nth 5 font-info)) |
| 310 | (defsubst bdf-info-baseline-offset (font-info) (nth 6 font-info)) |
| 311 | (defsubst bdf-info-code-range (font-info) (nth 7 font-info)) |
| 312 | (defsubst bdf-info-maxlen (font-info) (nth 8 font-info)) |
| 313 | (defsubst bdf-info-offset-vector (font-info) (nth 9 font-info)) |
| 314 | |
| 315 | (defun bdf-get-font-info (bdfname) |
| 316 | "Return information about `BDF' font file BDFNAME. |
| 317 | The value FONT-INFO is a list of the following format: |
| 318 | (BDFFILE ABSOLUTE-PATH MOD-TIME SIZE FONT-BOUNDING-BOX |
| 319 | RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR) |
| 320 | See the documentation of the function `bdf-read-font-info' for more detail." |
| 321 | (or bdf-cache |
| 322 | (bdf-read-cache)) |
| 323 | (let ((font-info (assoc bdfname bdf-cache))) |
| 324 | (if (or (not font-info) |
| 325 | (not (file-readable-p (bdf-info-absolute-path font-info))) |
| 326 | (bdf-file-newer-than-time bdfname (bdf-info-mod-time font-info))) |
| 327 | (progn |
| 328 | (setq font-info (bdf-read-font-info bdfname)) |
| 329 | (bdf-set-cache font-info))) |
| 330 | font-info)) |
| 331 | |
| 332 | (defun bdf-find-font-info (bdfnames) |
| 333 | "Return information about `BDF' font file with alternative names BDFNAMES. |
| 334 | |
| 335 | If BDFNAMES is a list of file names, this function finds the first file |
| 336 | in the list which exists and is readable, then calls `bdf-get-font-info' |
| 337 | on that file name." |
| 338 | (let ((fnlist bdfnames) |
| 339 | (fname bdfnames)) |
| 340 | (if (consp fnlist) |
| 341 | (while (and fnlist |
| 342 | (progn |
| 343 | (setq fname (car fnlist)) |
| 344 | (null (bdf-expand-file-name fname)))) |
| 345 | (setq fname nil |
| 346 | fnlist (cdr fnlist)))) |
| 347 | (bdf-get-font-info (or fname (car bdfnames))))) |
| 348 | |
| 349 | (defun bdf-read-bitmap (bdfname offset maxlen) |
| 350 | "Read `BDF' font file BDFNAME to get bitmap data at file position OFFSET. |
| 351 | BDFNAME is an absolute path name of the font file. |
| 352 | MAXLEN specifies how many bytes we should read at least. |
| 353 | The value is a list of DWIDTH, BBX, and BITMAP-STRING. |
| 354 | DWIDTH is a pixel width of a glyph. |
| 355 | BBX is a bounding box of the glyph. |
| 356 | BITMAP-STRING is a string representing bits by hexadecimal digits." |
| 357 | (let ((coding-system-for-read 'no-conversion) |
| 358 | dwidth bbx height yoff bitmap-string) |
| 359 | (condition-case nil |
| 360 | (with-temp-buffer |
| 361 | (insert-file-contents bdfname nil offset (+ offset maxlen)) |
| 362 | (goto-char (point-min)) |
| 363 | (search-forward "\nDWIDTH") |
| 364 | (setq dwidth (read (current-buffer))) |
| 365 | (goto-char (point-min)) |
| 366 | (search-forward "\nBBX") |
| 367 | (setq bbx (vector (read (current-buffer)) (read (current-buffer)) |
| 368 | (read (current-buffer)) (read (current-buffer))) |
| 369 | height (aref bbx 1) |
| 370 | yoff (aref bbx 3)) |
| 371 | (search-forward "\nBITMAP") |
| 372 | (forward-line 1) |
| 373 | (delete-region (point-min) (point)) |
| 374 | (and (looking-at "\\(0+\n\\)+") |
| 375 | (progn |
| 376 | (setq height (- height (count-lines (point) (match-end 0)))) |
| 377 | (delete-region (point) (match-end 0)))) |
| 378 | (or (looking-at "ENDCHAR") |
| 379 | (progn |
| 380 | (search-forward "ENDCHAR" nil 'move) |
| 381 | (forward-line -1) |
| 382 | (while (looking-at "0+$") |
| 383 | (setq yoff (1+ yoff) |
| 384 | height (1- height)) |
| 385 | (forward-line -1)) |
| 386 | (forward-line 1))) |
| 387 | (aset bbx 1 height) |
| 388 | (aset bbx 3 yoff) |
| 389 | (delete-region (point) (point-max)) |
| 390 | (goto-char (point-min)) |
| 391 | (while (not (eobp)) |
| 392 | (end-of-line) |
| 393 | (delete-char 1)) |
| 394 | (setq bitmap-string (buffer-string))) |
| 395 | (error nil)) |
| 396 | (list dwidth bbx bitmap-string))) |
| 397 | |
| 398 | (defun bdf-get-bitmaps (bdfname codes) |
| 399 | "Return bitmap information of glyphs of CODES in `BDF' font file BDFNAME. |
| 400 | CODES is a list of encoding number of glyphs in the file. |
| 401 | The value is a list of CODE, DWIDTH, BBX, and BITMAP-STRING. |
| 402 | DWIDTH is a pixel width of a glyph. |
| 403 | BBX is a bounding box of the glyph. |
| 404 | BITMAP-STRING is a string representing bits by hexadecimal digits." |
| 405 | (let* ((font-info (bdf-find-font-info bdfname)) |
| 406 | (absolute-path (bdf-info-absolute-path font-info)) |
| 407 | ;;(font-bounding-box (bdf-info-font-bounding-box font-info)) |
| 408 | (maxlen (bdf-info-maxlen font-info)) |
| 409 | (code-range (bdf-info-code-range font-info)) |
| 410 | (offset-vector (bdf-info-offset-vector font-info))) |
| 411 | (mapcar '(lambda (x) |
| 412 | (cons x (bdf-read-bitmap |
| 413 | absolute-path |
| 414 | (aref offset-vector (bdf-compact-code x code-range)) |
| 415 | maxlen))) |
| 416 | codes))) |
| 417 | |
| 418 | ;;; Interface to ps-print.el |
| 419 | |
| 420 | ;; Called from ps-mule-init-external-library. |
| 421 | (defun bdf-generate-prologue () |
| 422 | (or bdf-cache |
| 423 | (bdf-initialize)) |
| 424 | (ps-mule-generate-bitmap-prologue)) |
| 425 | |
| 426 | ;; Called from ps-mule-generate-font. |
| 427 | (defun bdf-generate-font (charset font-spec) |
| 428 | (let* ((font-name (ps-mule-font-spec-name font-spec)) |
| 429 | (font-info (bdf-find-font-info font-name)) |
| 430 | (font-name (if (consp font-name) (car font-name) font-name))) |
| 431 | (ps-mule-generate-bitmap-font font-name |
| 432 | (ps-mule-font-spec-bytes font-spec) |
| 433 | (charset-width charset) |
| 434 | (bdf-info-size font-info) |
| 435 | (bdf-info-relative-compose font-info) |
| 436 | (bdf-info-baseline-offset font-info) |
| 437 | (bdf-info-font-bounding-box font-info)))) |
| 438 | |
| 439 | ;; Called from ps-mule-generate-glyphs. |
| 440 | (defun bdf-generate-glyphs (font-spec code-list bytes) |
| 441 | (let ((font-name (ps-mule-font-spec-name font-spec))) |
| 442 | (mapcar '(lambda (x) |
| 443 | (apply 'ps-mule-generate-bitmap-glyph |
| 444 | (if (consp font-name) (car font-name) font-name) |
| 445 | x)) |
| 446 | (bdf-get-bitmaps font-name code-list)))) |
| 447 | |
| 448 | (provide 'ps-bdf) |
| 449 | |
| 450 | ;;; ps-bdf.el ends here |