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7840ced1 GM |
1 | ;;; gs.el --- interface to Ghostscript |
2 | ||
3 | ;; Copyright (C) 1998 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Maintainer: FSF | |
6 | ;; Keywords: internal | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; This code is experimental. Don't use it. | |
28 | ||
29 | ;;; Code: | |
30 | ||
31 | (defvar gs-program "gs" | |
32 | "The name of the Ghostscript interpreter.") | |
33 | ||
34 | ||
35 | (defvar gs-device "x11" | |
36 | "The Ghostscript device to use to produce images.") | |
37 | ||
38 | ||
39 | (defvar gs-options | |
40 | '("-q" | |
41 | ;"-dNOPAUSE" | |
42 | "-dBATCH" | |
43 | "-sDEVICE=<device>" | |
44 | "<file>") | |
45 | "List of command line arguments to pass to Ghostscript. | |
46 | Arguments may contain place-holders `<file>' for the name of the | |
47 | input file, and `<device>' for the device to use.") | |
48 | ||
49 | ||
50 | (defun gs-replace-in-string (string find repl) | |
51 | "Return STRING with all occurrences of FIND replaced by REPL. | |
52 | FIND is a regular expression." | |
53 | (while (string-match find string) | |
54 | (setq string (replace-match repl nil t string))) | |
55 | string) | |
56 | ||
57 | ||
58 | (defun gs-options (device file) | |
59 | "Return a list of command line options with place-holders replaced. | |
60 | DEVICE is the value to substitute for the place-holder `<device>', | |
61 | FILE is the value to substitute for the place-holder `<file>'." | |
62 | (mapcar #'(lambda (option) | |
63 | (setq option (gs-replace-in-string option "<device>" device) | |
64 | option (gs-replace-in-string option "<file>" file))) | |
65 | gs-options)) | |
66 | ||
67 | ||
68 | ;; The GHOSTVIEW property (taken from gv 3.5.8). | |
69 | ;; | |
70 | ;; Type: | |
71 | ;; | |
72 | ;; STRING | |
73 | ;; | |
74 | ;; Parameters: | |
75 | ;; | |
76 | ;; BPIXMAP ORIENT LLX LLY URX URY XDPI YDPI [LEFT BOTTOM TOP RIGHT] | |
77 | ;; | |
78 | ;; Scanf format: "%d %d %d %d %d %d %f %f %d %d %d %d" | |
79 | ;; | |
80 | ;; Explanation of parameters: | |
81 | ;; | |
82 | ;; BPIXMAP: pixmap id of the backing pixmap for the window. If no | |
83 | ;; pixmap is to be used, this parameter should be zero. This | |
84 | ;; parameter must be zero when drawing on a pixmap. | |
85 | ;; | |
86 | ;; ORIENT: orientation of the page. The number represents clockwise | |
87 | ;; rotation of the paper in degrees. Permitted values are 0, 90, 180, | |
88 | ;; 270. | |
89 | ;; | |
90 | ;; LLX, LLY, URX, URY: Bounding box of the drawable. The bounding box | |
91 | ;; is specified in PostScript points in default user coordinates. | |
92 | ;; | |
93 | ;; XDPI, YDPI: Resolution of window. (This can be derived from the | |
94 | ;; other parameters, but not without roundoff error. These values are | |
95 | ;; included to avoid this error.) | |
96 | ;; | |
97 | ;; LEFT, BOTTOM, TOP, RIGHT: (optional) Margins around the window. | |
98 | ;; The margins extend the imageable area beyond the boundaries of the | |
99 | ;; window. This is primarily used for popup zoom windows. I have | |
100 | ;; encountered several instances of PostScript programs that position | |
101 | ;; themselves with respect to the imageable area. The margins are | |
102 | ;; specified in PostScript points. If omitted, the margins are | |
103 | ;; assumed to be 0. | |
104 | ||
105 | (defun gs-width-in-pt (frame pixel-width) | |
106 | "Return, on FRAME, pixel width PIXEL-WIDTH tranlated to pt." | |
107 | (let ((mm (* (float pixel-width) | |
108 | (/ (float (x-display-mm-width frame)) | |
109 | (float (x-display-pixel-width frame)))))) | |
110 | (/ (* 25.4 mm) 72.0))) | |
111 | ||
112 | ||
113 | (defun gs-height-in-pt (frame pixel-height) | |
114 | "Return, on FRAME, pixel height PIXEL-HEIGHT tranlated to pt." | |
115 | (let ((mm (* (float pixel-height) | |
116 | (/ (float (x-display-mm-height frame)) | |
117 | (float (x-display-pixel-height frame)))))) | |
118 | (/ (* 25.4 mm) 72.0))) | |
119 | ||
120 | ||
121 | (defun gs-set-ghostview-window-prop (frame spec img-width img-height) | |
122 | "Set the `GHOSTVIEW' window property of FRAME. | |
123 | SPEC is a GS image specification. IMG-WIDTH is the width of the | |
124 | requested image, and IMG-HEIGHT is the height of the requested | |
125 | image in pixels." | |
126 | (let* ((box (plist-get (cdr spec) :bounding-box)) | |
127 | (llx (nth 0 box)) | |
128 | (lly (nth 1 box)) | |
129 | (urx (nth 2 box)) | |
130 | (ury (nth 3 box)) | |
131 | (rotation (or (plist-get (cdr spec) :rotate) 0)) | |
132 | ;; The pixel width IMG-WIDTH of the pixmap gives the | |
133 | ;; dots, URX - LLX give the inch. | |
134 | (in-width (/ (- urx llx) 72.0)) | |
135 | (in-height (/ (- ury lly) 72.0)) | |
136 | (xdpi (/ img-width in-width)) | |
137 | (ydpi (/ img-height in-height))) | |
138 | (x-change-window-property "GHOSTVIEW" | |
139 | (format "0 %d %d %d %d %d %g %g" | |
140 | rotation llx lly urx ury xdpi ydpi) | |
141 | frame))) | |
142 | ||
143 | ||
144 | (defun gs-set-ghostview-colors-window-prop (frame pixel-colors) | |
145 | "Set the `GHOSTVIEW_COLORS' environment variable depending on FRAME." | |
146 | (let ((mode (cond ((x-display-color-p frame) "Color") | |
147 | ((x-display-grayscale-p frame) "Grayscale") | |
148 | (t "Monochrome")))) | |
149 | (x-change-window-property "GHOSTVIEW_COLORS" | |
150 | (format "%s %s" mode pixel-colors)))) | |
151 | ||
152 | ||
153 | ; | |
154 | ;;;###autoload | |
155 | (defun gs-load-image (frame spec img-width img-height window-and-pixmap-id | |
156 | pixel-colors) | |
157 | "Load a PS image for display on FRAME. | |
158 | SPEC is an image specification, IMG-HEIGHT and IMG-WIDTH are width | |
159 | and height of the image in pixels. WINDOW-AND-PIXMAP-ID is a string of | |
160 | the form \"WINDOW-ID PIXMAP-ID\". Value is non-nil if successful." | |
161 | (unwind-protect | |
162 | (let ((file (plist-get (cdr spec) :file)) | |
163 | gs) | |
164 | (gs-set-ghostview-window-prop frame spec img-width img-height) | |
165 | (gs-set-ghostview-colors-window-prop frame pixel-colors) | |
166 | (setenv "GHOSTVIEW" window-and-pixmap-id) | |
167 | (setq gs (apply 'start-process "gs" "*GS*" gs-program | |
168 | (gs-options gs-device file))) | |
169 | (process-kill-without-query gs) | |
170 | gs) | |
171 | nil)) | |
172 | ||
173 | ||
174 | ;(defun gs-put-tiger () | |
175 | ; (let* ((ps-file "/usr/local/share/ghostscript/5.10/examples/tiger.ps") | |
176 | ; (spec `(image :type ghostscript | |
177 | ; :pt-width 200 :pt-height 200 | |
178 | ; :bounding-box (22 171 567 738) | |
179 | ; :file ,ps-file))) | |
180 | ; (put-text-property 1 2 'display spec))) | |
181 | ; | |
182 | ||
183 | (provide 'gs) | |
184 | ||
185 | ;; gs.el ends here. |