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Diffstat (limited to 'lisp/gs.el')
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diff --git a/lisp/gs.el b/lisp/gs.el new file mode 100644 index 00000000000..2a368bae199 --- /dev/null +++ b/lisp/gs.el @@ -0,0 +1,185 @@ +;;; gs.el --- interface to Ghostscript + +;; Copyright (C) 1998 Free Software Foundation, Inc. + +;; Maintainer: FSF +;; Keywords: internal + +;; This file is part of GNU Emacs. + +;; GNU Emacs is free software; you can redistribute it and/or modify +;; it under the terms of the GNU General Public License as published by +;; the Free Software Foundation; either version 2, or (at your option) +;; any later version. + +;; GNU Emacs is distributed in the hope that it will be useful, +;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;; GNU General Public License for more details. + +;; You should have received a copy of the GNU General Public License +;; along with GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;;; Commentary: + +;; This code is experimental. Don't use it. + +;;; Code: + +(defvar gs-program "gs" + "The name of the Ghostscript interpreter.") + + +(defvar gs-device "x11" + "The Ghostscript device to use to produce images.") + + +(defvar gs-options + '("-q" + ;"-dNOPAUSE" + "-dBATCH" + "-sDEVICE=<device>" + "<file>") + "List of command line arguments to pass to Ghostscript. +Arguments may contain place-holders `<file>' for the name of the +input file, and `<device>' for the device to use.") + + +(defun gs-replace-in-string (string find repl) + "Return STRING with all occurrences of FIND replaced by REPL. +FIND is a regular expression." + (while (string-match find string) + (setq string (replace-match repl nil t string))) + string) + + +(defun gs-options (device file) + "Return a list of command line options with place-holders replaced. +DEVICE is the value to substitute for the place-holder `<device>', +FILE is the value to substitute for the place-holder `<file>'." + (mapcar #'(lambda (option) + (setq option (gs-replace-in-string option "<device>" device) + option (gs-replace-in-string option "<file>" file))) + gs-options)) + + +;; The GHOSTVIEW property (taken from gv 3.5.8). +;; +;; Type: +;; +;; STRING +;; +;; Parameters: +;; +;; BPIXMAP ORIENT LLX LLY URX URY XDPI YDPI [LEFT BOTTOM TOP RIGHT] +;; +;; Scanf format: "%d %d %d %d %d %d %f %f %d %d %d %d" +;; +;; Explanation of parameters: +;; +;; BPIXMAP: pixmap id of the backing pixmap for the window. If no +;; pixmap is to be used, this parameter should be zero. This +;; parameter must be zero when drawing on a pixmap. +;; +;; ORIENT: orientation of the page. The number represents clockwise +;; rotation of the paper in degrees. Permitted values are 0, 90, 180, +;; 270. +;; +;; LLX, LLY, URX, URY: Bounding box of the drawable. The bounding box +;; is specified in PostScript points in default user coordinates. +;; +;; XDPI, YDPI: Resolution of window. (This can be derived from the +;; other parameters, but not without roundoff error. These values are +;; included to avoid this error.) +;; +;; LEFT, BOTTOM, TOP, RIGHT: (optional) Margins around the window. +;; The margins extend the imageable area beyond the boundaries of the +;; window. This is primarily used for popup zoom windows. I have +;; encountered several instances of PostScript programs that position +;; themselves with respect to the imageable area. The margins are +;; specified in PostScript points. If omitted, the margins are +;; assumed to be 0. + +(defun gs-width-in-pt (frame pixel-width) + "Return, on FRAME, pixel width PIXEL-WIDTH tranlated to pt." + (let ((mm (* (float pixel-width) + (/ (float (x-display-mm-width frame)) + (float (x-display-pixel-width frame)))))) + (/ (* 25.4 mm) 72.0))) + + +(defun gs-height-in-pt (frame pixel-height) + "Return, on FRAME, pixel height PIXEL-HEIGHT tranlated to pt." + (let ((mm (* (float pixel-height) + (/ (float (x-display-mm-height frame)) + (float (x-display-pixel-height frame)))))) + (/ (* 25.4 mm) 72.0))) + + +(defun gs-set-ghostview-window-prop (frame spec img-width img-height) + "Set the `GHOSTVIEW' window property of FRAME. +SPEC is a GS image specification. IMG-WIDTH is the width of the +requested image, and IMG-HEIGHT is the height of the requested +image in pixels." + (let* ((box (plist-get (cdr spec) :bounding-box)) + (llx (nth 0 box)) + (lly (nth 1 box)) + (urx (nth 2 box)) + (ury (nth 3 box)) + (rotation (or (plist-get (cdr spec) :rotate) 0)) + ;; The pixel width IMG-WIDTH of the pixmap gives the + ;; dots, URX - LLX give the inch. + (in-width (/ (- urx llx) 72.0)) + (in-height (/ (- ury lly) 72.0)) + (xdpi (/ img-width in-width)) + (ydpi (/ img-height in-height))) + (x-change-window-property "GHOSTVIEW" + (format "0 %d %d %d %d %d %g %g" + rotation llx lly urx ury xdpi ydpi) + frame))) + + +(defun gs-set-ghostview-colors-window-prop (frame pixel-colors) + "Set the `GHOSTVIEW_COLORS' environment variable depending on FRAME." + (let ((mode (cond ((x-display-color-p frame) "Color") + ((x-display-grayscale-p frame) "Grayscale") + (t "Monochrome")))) + (x-change-window-property "GHOSTVIEW_COLORS" + (format "%s %s" mode pixel-colors)))) + + +; +;;;###autoload +(defun gs-load-image (frame spec img-width img-height window-and-pixmap-id + pixel-colors) + "Load a PS image for display on FRAME. +SPEC is an image specification, IMG-HEIGHT and IMG-WIDTH are width +and height of the image in pixels. WINDOW-AND-PIXMAP-ID is a string of +the form \"WINDOW-ID PIXMAP-ID\". Value is non-nil if successful." + (unwind-protect + (let ((file (plist-get (cdr spec) :file)) + gs) + (gs-set-ghostview-window-prop frame spec img-width img-height) + (gs-set-ghostview-colors-window-prop frame pixel-colors) + (setenv "GHOSTVIEW" window-and-pixmap-id) + (setq gs (apply 'start-process "gs" "*GS*" gs-program + (gs-options gs-device file))) + (process-kill-without-query gs) + gs) + nil)) + + +;(defun gs-put-tiger () +; (let* ((ps-file "/usr/local/share/ghostscript/5.10/examples/tiger.ps") +; (spec `(image :type ghostscript +; :pt-width 200 :pt-height 200 +; :bounding-box (22 171 567 738) +; :file ,ps-file))) +; (put-text-property 1 2 'display spec))) +; + +(provide 'gs) + +;; gs.el ends here. |