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404 lines
15 KiB
EmacsLisp
404 lines
15 KiB
EmacsLisp
;;; bdf.el --- BDF font file handler for ps-print.
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;; Copyright (C) 1998 Electrotechnical Laboratory, JAPAN.
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;; Licensed to the Free Software Foundation.
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;; Keywords: BDF, font, PostScript
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Functions for getting bitmap information from X's BDF font file are
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;; provided.
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;;; Code:
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(eval-when-compile (require 'ps-print))
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(defvar bdf-directory-list
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nil
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"*List of directories to search for `BDF' font files.")
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(defun bdf-expand-file-name (bdfname)
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"Return an abosolute path name of a `BDF' font file BDFNAME.
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It searches directories listed in the variable `bdf-directory-list'
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for BDFNAME."
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(if (file-name-absolute-p bdfname)
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(if (file-readable-p bdfname)
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bdfname)
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(let ((l bdf-directory-list))
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(catch 'tag
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(while l
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(if (file-readable-p (expand-file-name bdfname (car l)))
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(throw 'tag (expand-file-name bdfname (car l))))
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(setq l (cdr l)))))))
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(defsubst bdf-file-mod-time (filename)
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"Return modification time of FILENAME.
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The value is a list of two integers, the first integer has high-order
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16 bits, the second has low 16 bits."
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(nth 5 (file-attributes filename)))
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(defun bdf-file-newer-than-time (filename mod-time)
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"Return non-nil if and only if FILENAME is newer than MOD-TIME.
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MOD-TIME is a modification time as a list of two integers, the first
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integer has high-order 16 bits, the second has low 16 bits."
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(let ((new-mod-time (bdf-file-mod-time (bdf-expand-file-name filename))))
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(or (> (car new-mod-time) (car mod-time))
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(and (= (car new-mod-time) (car mod-time))
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(> (nth 1 new-mod-time) (nth 1 mod-time))))))
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(defun bdf-find-file (bdfname)
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"Return a buffer visiting a bdf file BDFNAME.
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If BDFNAME is not an absolute path, directories listed in
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`bdf-directory-list' is searched.
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If BDFNAME doesn't exist, return nil."
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(let ((buf (generate-new-buffer " *bdf-work*"))
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(coding-system-for-read 'no-conversion))
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(save-excursion
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(set-buffer buf)
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(insert-file-contents (bdf-expand-file-name bdfname))
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buf)))
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(defvar bdf-cache-file "~/.bdfcache.el"
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"Name of cache file which contains information of `BDF' font files.")
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(defvar bdf-cache nil
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"Cached information of `BDF' font files. It is a list of FONT-INFO.
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FONT-INFO is a list of the following format:
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(BDFFILE ABSOLUTE-PATH MOD-TIME SIZE FONT-BOUNDING-BOX
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RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR)
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See the documentation of the function `bdf-read-font-info' for more detail.")
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(defun bdf-read-cache ()
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"Return a cached information about `BDF' font files from a cache file.
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The variable `bdf-cache-file' holds the cache file name.
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If the cache file is not readable, this return nil."
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(setq bdf-cache nil)
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(condition-case nil
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(if (file-readable-p bdf-cache-file)
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(load-file bdf-cache-file))
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(error nil))
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(if (not (listp bdf-cache))
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(setq bdf-cache nil)))
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(defun bdf-write-cache ()
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"Write out cached information of `BDF' font file to a file.
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The variable `bdf-cache-file' holds the cache file name.
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The file is written if and only if the file alreay exists and writable."
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(if (and bdf-cache
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(file-exists-p bdf-cache-file)
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(file-writable-p bdf-cache-file))
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(write-region (format "(setq bdf-cache '%S)\n" bdf-cache)
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nil bdf-cache-file)))
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(defun bdf-set-cache (font-info)
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"Cache FONT-INFO as information about one `BDF' font file.
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FONT-INFO is a list of the following format:
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(BDFFILE ABSOLUTE-PATH MOD-TIME SIZE FONT-BOUNDING-BOX
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RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR)
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See the documentation of the function `bdf-read-font-info' for more detail."
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(let ((slot (assoc (car font-info) bdf-cache)))
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(if slot
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(setcdr slot (cdr font-info))
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(setq bdf-cache (cons font-info bdf-cache)))))
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(defun bdf-initialize ()
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"Initialize `bdf' library."
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(if (bdf-read-cache)
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(add-hook 'kill-emacs-hook 'bdf-write-cache)))
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(defun bdf-compact-code (code code-range)
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(if (or (< code (aref code-range 4))
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(> code (aref code-range 5)))
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(setq code (aref code-range 6)))
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(+ (* (- (lsh code -8) (aref code-range 0))
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(1+ (- (aref code-range 3) (aref code-range 2))))
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(- (logand code 255) (aref code-range 2))))
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(defun bdf-expand-code (code code-range)
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(let ((code0-range (1+ (- (aref code-range 3) (aref code-range 2)))))
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(+ (* (+ (/ code code0-range) (aref code-range 0)) 256)
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(+ (% code code0-range) (aref code-range 2)))))
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(defun bdf-read-font-info (bdfname)
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"Read `BDF' font file BDFNAME and return information (FONT-INFO) of the file.
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FONT-INFO is a list of the following format:
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(BDFFILE ABSOLUTE-PATH MOD-TIME FONT-BOUNDING-BOX
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RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR)
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BDFFILE is a name of a font file (excluding directory part).
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ABSOLUTE-PATH is an absolute path of the font file.
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MOD-TIME is last modification time as a list of two integers, the
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first integer has high-order 16 bits, the second has low 16 bits.
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SIZE is a size of the font. This value is got from SIZE record of the
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font.
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FONT-BOUNDING-BOX is the font bounding box as a list of four integers,
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BBX-WIDTH, BBX-HEIGHT, BBX-XOFF, and BBX-YOFF.
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RELATIVE-COMPOSE is an integer value of the font's property
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`_MULE_RELATIVE_COMPOSE'. If the font doesn't have this property, the
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value is 0.
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BASELINE-OFFSET is an integer value of the font's property
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`_MULE_BASELINE_OFFSET'. If the font doesn't have this property, the
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value is 0.
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CODE-RANGE is a vector of minimum 1st byte, maximum 1st byte, minimum
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2nd byte, maximum 2nd byte, minimum code, maximum code, and default
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code. For 1-byte fonts, the first two elements are 0.
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MAXLEN is a maximum bytes of one glyph informaion in the font file.
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OFFSET-VECTOR is a vector of a file position which starts bitmap data
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of the glyph in the font file.
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Nth element of OFFSET-VECTOR is a file position for the glyph of code
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CODE, where N and CODE are in the following relation:
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(bdf-compact-code CODE) => N, (bdf-expand-code N) => CODE"
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(let ((absolute-path (bdf-expand-file-name bdfname))
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(maxlen 0)
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size
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font-bounding-box
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(relative-compose 'false)
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(baseline-offset 0)
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default-char
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code-range
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offset-vector
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buf)
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(if absolute-path
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(message "Reading %s..." bdfname)
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(error "BDF file %s doesn't exist" bdfname))
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(setq buf (bdf-find-file absolute-path))
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(unwind-protect
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(save-excursion
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(set-buffer buf)
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(goto-char (point-min))
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(search-forward "\nFONTBOUNDINGBOX")
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(setq font-bounding-box (vector (read (current-buffer))
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(read (current-buffer))
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(read (current-buffer))
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(read (current-buffer))))
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;; The following kludgy code is to avoid bugs of fonts
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;; jiskan16.bdf and jiskan24.bdf distributed with X.
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;; They contain wrong FONTBOUNDINGBOX.
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(if (and (> (aref font-bounding-box 3) 0)
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(string-match "jiskan\\(16\\|24\\)" bdfname))
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(aset font-bounding-box 3
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(- (aref font-bounding-box 3))))
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(goto-char (point-min))
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(search-forward "\nSIZE ")
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(setq size (read (current-buffer)))
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;; The following kludgy code is t avoid bugs of several
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;; fonts which have wrong SIZE record.
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(if (<= size (/ (aref font-bounding-box 1) 2))
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(setq size (aref font-bounding-box 1)))
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(goto-char (point-min))
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(if (search-forward "\nDEFAULT_CHAR" nil t)
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(setq default-char (read (current-buffer))))
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(search-forward "\nSTARTCHAR")
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(forward-line -1)
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(let ((limit (point)))
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(goto-char (point-min))
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(if (search-forward "\n_MULE_RELATIVE_COMPOSE" limit t)
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(progn
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(goto-char (match-end 0))
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(setq relative-compose (read (current-buffer)))))
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(goto-char (point-min))
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(if (search-forward "\n_MULE_BASELINE_OFFSET" limit t)
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(progn
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(goto-char (match-end 0))
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(setq baseline-offset (read (current-buffer))))))
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(let ((min-code0 256) (min-code1 256) (max-code0 0) (max-code1 0)
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(min-code 65536)
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(max-code 0)
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(glyph-list nil)
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code bbx offset)
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(while (search-forward "\nSTARTCHAR" nil t)
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(setq offset (line-beginning-position))
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(search-forward "\nENCODING")
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(setq code (read (current-buffer)))
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(let ((code0 (lsh code -8))
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(code1 (logand code 255)))
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(if (< code0 min-code0) (setq min-code0 code0)
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(if (> code0 max-code0) (setq max-code0 code0)))
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(if (< code1 min-code1) (setq min-code1 code1)
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(if (> code1 max-code1) (setq max-code1 code1))))
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(if (< code min-code)
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(setq min-code code)
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(if (> code max-code)
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(setq max-code code)))
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(search-forward "ENDCHAR")
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(if (< maxlen (- (point) offset))
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(setq maxlen (- (point) offset)))
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(setq glyph-list (cons (cons code offset) glyph-list)))
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(setq code-range
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(vector min-code0 max-code0 min-code1 max-code1
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min-code max-code (or default-char min-code)))
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(setq offset-vector
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(make-vector (1+ (bdf-compact-code max-code code-range))
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nil))
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(while glyph-list
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(let ((glyph (car glyph-list)))
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(aset offset-vector
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(bdf-compact-code (car glyph) code-range)
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(cdr glyph)))
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(setq glyph-list (cdr glyph-list)))))
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(kill-buffer buf))
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(message "Reading %s...done" bdfname)
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(list bdfname absolute-path (bdf-file-mod-time absolute-path)
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size font-bounding-box relative-compose baseline-offset
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code-range maxlen offset-vector)))
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(defsubst bdf-info-absolute-path (font-info) (nth 1 font-info))
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(defsubst bdf-info-mod-time (font-info) (nth 2 font-info))
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(defsubst bdf-info-size (font-info) (nth 3 font-info))
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(defsubst bdf-info-font-bounding-box (font-info) (nth 4 font-info))
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(defsubst bdf-info-relative-compose (font-info) (nth 5 font-info))
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(defsubst bdf-info-baseline-offset (font-info) (nth 6 font-info))
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(defsubst bdf-info-code-range (font-info) (nth 7 font-info))
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(defsubst bdf-info-maxlen (font-info) (nth 8 font-info))
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(defsubst bdf-info-offset-vector (font-info) (nth 9 font-info))
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(defun bdf-get-font-info (bdfname)
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"Return information about `BDF' font file BDFNAME.
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The value FONT-INFO is a list of the following format:
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(BDFFILE ABSOLUTE-PATH MOD-TIME SIZE FONT-BOUNDING-BOX
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RELATIVE-COMPOSE BASELINE-OFFSET CODE-RANGE MAXLEN OFFSET-VECTOR)
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See the documentation of the function `bdf-read-font-info' for more detail."
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(or bdf-cache
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(bdf-read-cache))
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(let ((font-info (assoc bdfname bdf-cache)))
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(if (or (not font-info)
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(not (file-readable-p (bdf-info-absolute-path font-info)))
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(bdf-file-newer-than-time bdfname (bdf-info-mod-time font-info)))
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(progn
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(setq font-info (bdf-read-font-info bdfname))
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(bdf-set-cache font-info)))
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font-info))
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(defun bdf-read-bitmap (bdfname offset maxlen)
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"Read `BDF' font file BDFNAME to get bitmap data at file poistion OFFSET.
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BDFNAME is an abosolute path name of the font file.
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MAXLEN specifies how many bytes we should read at least.
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The value is a list of DWIDTH, BBX, and BITMAP-STRING.
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DWIDTH is a pixel width of a glyph.
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BBX is a bounding box of the glyph.
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BITMAP-STRING is a string representing bits by hexadecimal digits."
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(let ((coding-system-for-read 'no-conversion)
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dwidth bbx height yoff bitmap-string)
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(condition-case nil
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(with-temp-buffer
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(insert-file-contents bdfname nil offset (+ offset maxlen))
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(goto-char (point-min))
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(search-forward "\nDWIDTH")
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(setq dwidth (read (current-buffer)))
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(goto-char (point-min))
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(search-forward "\nBBX")
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(setq bbx (vector (read (current-buffer)) (read (current-buffer))
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(read (current-buffer)) (read (current-buffer))))
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(setq height (aref bbx 1) yoff (aref bbx 3))
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(search-forward "\nBITMAP")
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(forward-line 1)
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(delete-region (point-min) (point))
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(if (looking-at "\\(0+\n\\)+")
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(progn
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(setq height
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(- height (count-lines (point) (match-end 0))))
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(delete-region (point) (match-end 0))))
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(or (looking-at "ENDCHAR")
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(progn
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(search-forward "ENDCHAR" nil 'move)
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(forward-line -1)
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(while (looking-at "0+$")
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(setq yoff (1+ yoff) height (1- height))
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(forward-line -1))
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(forward-line 1)))
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(aset bbx 1 height)
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(aset bbx 3 yoff)
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(delete-region (point) (point-max))
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(goto-char (point-min))
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(while (not (eobp))
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(end-of-line)
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(delete-char 1))
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(setq bitmap-string (buffer-string)))
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(error nil))
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(list dwidth bbx bitmap-string)))
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(defun bdf-get-bitmaps (bdfname codes)
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"Return bitmap information of glyphs of CODES in `BDF' font file BDFNAME.
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CODES is a list of encoding number of glyphs in the file.
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The value is a list of CODE, DWIDTH, BBX, and BITMAP-STRING.
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DWIDTH is a pixel width of a glyph.
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BBX is a bounding box of the glyph.
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BITMAP-STRING is a string representing bits by hexadecimal digits."
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(let* ((font-info (bdf-get-font-info bdfname))
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(absolute-path (bdf-info-absolute-path font-info))
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(font-bounding-box (bdf-info-font-bounding-box font-info))
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(maxlen (bdf-info-maxlen font-info))
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(code-range (bdf-info-code-range font-info))
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(offset-vector (bdf-info-offset-vector font-info)))
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(mapcar (function
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(lambda (x)
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(cons x (bdf-read-bitmap
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absolute-path
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(aref offset-vector (bdf-compact-code x code-range))
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maxlen))))
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codes)))
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;;; Interface to ps-print.el
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;; Called from ps-mule-init-external-library.
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(defun bdf-generate-prologue ()
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(or bdf-cache
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(bdf-initialize))
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(ps-mule-generate-bitmap-prologue))
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;; Called from ps-mule-generate-font.
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(defun bdf-generate-font (charset font-spec)
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(let* ((font-name (ps-mule-font-spec-name font-spec))
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(font-info (bdf-get-font-info font-name)))
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(ps-mule-generate-bitmap-font font-name
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(ps-mule-font-spec-bytes font-spec)
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(charset-width charset)
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(bdf-info-size font-info)
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(bdf-info-relative-compose font-info)
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(bdf-info-baseline-offset font-info)
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(bdf-info-font-bounding-box font-info))))
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;; Called from ps-mule-generate-glyphs.
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(defun bdf-generate-glyphs (font-spec code-list bytes)
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(let ((font-name (ps-mule-font-spec-name font-spec)))
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(mapcar (function
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(lambda (x)
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(apply 'ps-mule-generate-bitmap-glyph font-name x)))
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(bdf-get-bitmaps font-name code-list))))
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(provide 'bdf)
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;;; bdf.el ends here
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