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[Emacs-diffs] Changes to emacs/lisp/gs.el [lexbind]
From: |
Miles Bader |
Subject: |
[Emacs-diffs] Changes to emacs/lisp/gs.el [lexbind] |
Date: |
Tue, 14 Oct 2003 19:51:58 -0400 |
Index: emacs/lisp/gs.el
diff -c /dev/null emacs/lisp/gs.el:1.9.8.1
*** /dev/null Tue Oct 14 19:51:58 2003
--- emacs/lisp/gs.el Tue Oct 14 19:51:05 2003
***************
*** 0 ****
--- 1,216 ----
+ ;;; gs.el --- interface to Ghostscript
+
+ ;; Copyright (C) 1998, 2001 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-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 (replace-regexp-in-string "<device>" device option)
+ option (replace-regexp-in-string "<file>" file option)))
+ 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 (elt box 0))
+ (lly (elt box 1))
+ (urx (elt box 2))
+ (ury (elt box 3))
+ (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)
+ frame)))
+
+
+ ;
+ ;;;###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
+ (timeout 40))
+ ;; Wait while property gets freed from a previous ghostscript process
+ ;; sit-for returns nil as soon as input starts being
+ ;; available, so if we want to give GhostScript a reasonable
+ ;; chance of starting up, we better use sleep-for. We let
+ ;; sleep-for wait only half the time because if input is
+ ;; available, it is more likely that we don't care that much
+ ;; about garbled redisplay and are in a hurry.
+ (while (and
+ ;; Wait while the property is not yet available
+ (not (zerop (length (x-window-property "GHOSTVIEW"
+ frame))))
+ ;; The following was an alternative condition: wait
+ ;; while there is still a process running. The idea
+ ;; was to avoid contention between processes. Turned
+ ;; out even more sluggish.
+ ;; (get-buffer-process "*GS*")
+ (not (zerop timeout)))
+ (unless (sit-for 0 100 t)
+ (sleep-for 0 50))
+ (setq timeout (1- timeout)))
+
+ ;; No use waiting longer. We might want to try killing off
+ ;; stuck processes, but there is no point in doing so: either
+ ;; they are stuck for good, in which case the user would
+ ;; probably be responsible for that, and killing them off will
+ ;; make debugging harder, or they are not. In that case, they
+ ;; will cause incomplete displays. But the same will happen
+ ;; if they are killed, anyway. The whole is rather
+ ;; disconcerting, and fast scrolling through a dozen images
+ ;; will make Emacs freeze for a while. The alternatives are a)
+ ;; proper implementation not waiting at all but creating
+ ;; appropriate queues, or b) permanently bad display due to
+ ;; bad cached images. So remember that this
+ ;; is just a hack and if people don't like the behaviour, they
+ ;; will most likely like the easy alternatives even less.
+ ;; And at least the image cache will make the delay apparent
+ ;; just once.
+ (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 postscript
+ ; :pt-width 200 :pt-height 200
+ ; :bounding-box (22 171 567 738)
+ ; :file ,ps-file)))
+ ; (put-text-property 1 2 'display spec)))
+ ;
+
+ (provide 'gs)
+
+ ;;; arch-tag: 06ab51b8-4932-4cfe-9f60-b924a8edb3f0
+ ;;; gs.el ends here
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Miles Bader <=