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call to `add-text-properties' to prevent directory time modification by lock_file. Replace `set-buffer-modified-p' with `restore-buffer-modified-p'. (Bug#2295)
501 lines
19 KiB
EmacsLisp
501 lines
19 KiB
EmacsLisp
;;; image-mode.el --- support for visiting image files
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;;
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;; Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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;;
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;; Author: Richard Stallman <rms@gnu.org>
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;; Keywords: multimedia
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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 3 of the License, or
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;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Defines a major mode for visiting image files
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;; that allows conversion between viewing the text of the file
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;; and viewing the file as an image. Viewing the image
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;; works by putting a `display' text-property on the
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;; image data, with the image-data still present underneath; if the
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;; resulting buffer file is saved to another name it will correctly save
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;; the image data to the new file.
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;;; Code:
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(require 'image)
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(eval-when-compile (require 'cl))
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;;;###autoload (push '("\\.jpe?g\\'" . image-mode) auto-mode-alist)
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;;;###autoload (push '("\\.png\\'" . image-mode) auto-mode-alist)
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;;;###autoload (push '("\\.gif\\'" . image-mode) auto-mode-alist)
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;;;###autoload (push '("\\.tiff?\\'" . image-mode) auto-mode-alist)
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;;;###autoload (push '("\\.p[bpgn]m\\'" . image-mode) auto-mode-alist)
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;;;###autoload (push '("\\.x[bp]m\\'" . c-mode) auto-mode-alist)
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;;;###autoload (push '("\\.x[bp]m\\'" . image-mode-maybe) auto-mode-alist)
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;;;###autoload (push '("\\.svgz?\\'" . xml-mode) auto-mode-alist)
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;;;###autoload (push '("\\.svgz?\\'" . image-mode-maybe) auto-mode-alist)
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;;; Image mode window-info management.
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(defvar image-mode-winprops-alist t)
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(make-variable-buffer-local 'image-mode-winprops-alist)
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(defvar image-mode-new-window-functions nil
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"Special hook run when image data is requested in a new window.
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It is called with one argument, the initial WINPROPS.")
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(defun image-mode-winprops (&optional window cleanup)
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"Return winprops of WINDOW.
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A winprops object has the shape (WINDOW . ALIST)."
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(cond ((null window)
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(setq window (selected-window)))
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((not (windowp window))
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(error "Not a window: %s" window)))
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(when cleanup
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(setq image-mode-winprops-alist
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(delq nil (mapcar (lambda (winprop)
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(if (window-live-p (car-safe winprop))
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winprop))
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image-mode-winprops-alist))))
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(let ((winprops (assq window image-mode-winprops-alist)))
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;; For new windows, set defaults from the latest.
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(unless winprops
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(setq winprops (cons window
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(copy-alist (cdar image-mode-winprops-alist))))
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(run-hook-with-args 'image-mode-new-window-functions winprops))
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;; Move window to front.
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(setq image-mode-winprops-alist
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(cons winprops (delq winprops image-mode-winprops-alist)))
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winprops))
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(defun image-mode-window-get (prop &optional winprops)
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(unless (consp winprops) (setq winprops (image-mode-winprops winprops)))
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(cdr (assq prop (cdr winprops))))
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(defsetf image-mode-window-get (prop &optional winprops) (val)
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`(image-mode-window-put ,prop ,val ,winprops))
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(defun image-mode-window-put (prop val &optional winprops)
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(unless (consp winprops) (setq winprops (image-mode-winprops winprops)))
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(setcdr winprops (cons (cons prop val)
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(delq (assq prop (cdr winprops)) (cdr winprops)))))
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(defun image-set-window-vscroll (vscroll)
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(setf (image-mode-window-get 'vscroll) vscroll)
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(set-window-vscroll (selected-window) vscroll))
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(defun image-set-window-hscroll (ncol)
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(setf (image-mode-window-get 'hscroll) ncol)
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(set-window-hscroll (selected-window) ncol))
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(defun image-mode-reapply-winprops ()
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;; When set-window-buffer, set hscroll and vscroll to what they were
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;; last time the image was displayed in this window.
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(when (and (image-get-display-property)
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(listp image-mode-winprops-alist))
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(let* ((winprops (image-mode-winprops nil t))
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(hscroll (image-mode-window-get 'hscroll winprops))
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(vscroll (image-mode-window-get 'vscroll winprops)))
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(if hscroll (set-window-hscroll (selected-window) hscroll))
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(if vscroll (set-window-vscroll (selected-window) vscroll)))))
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(defun image-mode-setup-winprops ()
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;; Record current scroll settings.
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(unless (listp image-mode-winprops-alist)
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(setq image-mode-winprops-alist nil))
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(add-hook 'window-configuration-change-hook
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'image-mode-reapply-winprops nil t))
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;;; Image scrolling functions
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(defun image-get-display-property ()
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(get-char-property (point-min) 'display
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;; There might be different images for different displays.
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(if (eq (window-buffer) (current-buffer))
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(selected-window))))
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(declare-function image-size "image.c" (spec &optional pixels frame))
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(defun image-forward-hscroll (&optional n)
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"Scroll image in current window to the left by N character widths.
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Stop if the right edge of the image is reached."
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(interactive "p")
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(cond ((= n 0) nil)
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((< n 0)
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(image-set-window-hscroll (max 0 (+ (window-hscroll) n))))
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(t
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(let* ((image (image-get-display-property))
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(edges (window-inside-edges))
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(win-width (- (nth 2 edges) (nth 0 edges)))
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(img-width (ceiling (car (image-size image)))))
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(image-set-window-hscroll (min (max 0 (- img-width win-width))
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(+ n (window-hscroll))))))))
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(defun image-backward-hscroll (&optional n)
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"Scroll image in current window to the right by N character widths.
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Stop if the left edge of the image is reached."
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(interactive "p")
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(image-forward-hscroll (- n)))
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(defun image-next-line (&optional n)
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"Scroll image in current window upward by N lines.
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Stop if the bottom edge of the image is reached."
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(interactive "p")
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(cond ((= n 0) nil)
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((< n 0)
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(image-set-window-vscroll (max 0 (+ (window-vscroll) n))))
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(t
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(let* ((image (image-get-display-property))
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(edges (window-inside-edges))
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(win-height (- (nth 3 edges) (nth 1 edges)))
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(img-height (ceiling (cdr (image-size image)))))
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(image-set-window-vscroll (min (max 0 (- img-height win-height))
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(+ n (window-vscroll))))))))
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(defun image-previous-line (&optional n)
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"Scroll image in current window downward by N lines.
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Stop if the top edge of the image is reached."
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(interactive "p")
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(image-next-line (- n)))
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(defun image-scroll-up (&optional n)
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"Scroll image in current window upward by N lines.
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Stop if the bottom edge of the image is reached.
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If ARG is omitted or nil, scroll upward by a near full screen.
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A near full screen is `next-screen-context-lines' less than a full screen.
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Negative ARG means scroll downward.
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If ARG is the atom `-', scroll downward by nearly full screen.
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When calling from a program, supply as argument a number, nil, or `-'."
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(interactive "P")
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(cond ((null n)
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(let* ((edges (window-inside-edges))
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(win-height (- (nth 3 edges) (nth 1 edges))))
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(image-next-line
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(max 0 (- win-height next-screen-context-lines)))))
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((eq n '-)
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(let* ((edges (window-inside-edges))
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(win-height (- (nth 3 edges) (nth 1 edges))))
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(image-next-line
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(min 0 (- next-screen-context-lines win-height)))))
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(t (image-next-line (prefix-numeric-value n)))))
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(defun image-scroll-down (&optional n)
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"Scroll image in current window downward by N lines.
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Stop if the top edge of the image is reached.
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If ARG is omitted or nil, scroll downward by a near full screen.
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A near full screen is `next-screen-context-lines' less than a full screen.
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Negative ARG means scroll upward.
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If ARG is the atom `-', scroll upward by nearly full screen.
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When calling from a program, supply as argument a number, nil, or `-'."
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(interactive "P")
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(cond ((null n)
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(let* ((edges (window-inside-edges))
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(win-height (- (nth 3 edges) (nth 1 edges))))
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(image-next-line
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(min 0 (- next-screen-context-lines win-height)))))
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((eq n '-)
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(let* ((edges (window-inside-edges))
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(win-height (- (nth 3 edges) (nth 1 edges))))
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(image-next-line
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(max 0 (- win-height next-screen-context-lines)))))
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(t (image-next-line (- (prefix-numeric-value n))))))
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(defun image-bol (arg)
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"Scroll horizontally to the left edge of the image in the current window.
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With argument ARG not nil or 1, move forward ARG - 1 lines first,
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stopping if the top or bottom edge of the image is reached."
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(interactive "p")
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(and arg
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(/= (setq arg (prefix-numeric-value arg)) 1)
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(image-next-line (- arg 1)))
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(image-set-window-hscroll 0))
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(defun image-eol (arg)
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"Scroll horizontally to the right edge of the image in the current window.
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With argument ARG not nil or 1, move forward ARG - 1 lines first,
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stopping if the top or bottom edge of the image is reached."
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(interactive "p")
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(and arg
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(/= (setq arg (prefix-numeric-value arg)) 1)
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(image-next-line (- arg 1)))
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(let* ((image (image-get-display-property))
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(edges (window-inside-edges))
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(win-width (- (nth 2 edges) (nth 0 edges)))
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(img-width (ceiling (car (image-size image)))))
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(image-set-window-hscroll (max 0 (- img-width win-width)))))
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(defun image-bob ()
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"Scroll to the top-left corner of the image in the current window."
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(interactive)
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(image-set-window-hscroll 0)
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(image-set-window-vscroll 0))
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(defun image-eob ()
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"Scroll to the bottom-right corner of the image in the current window."
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(interactive)
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(let* ((image (image-get-display-property))
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(edges (window-inside-edges))
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(win-width (- (nth 2 edges) (nth 0 edges)))
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(img-width (ceiling (car (image-size image))))
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(win-height (- (nth 3 edges) (nth 1 edges)))
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(img-height (ceiling (cdr (image-size image)))))
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(image-set-window-hscroll (max 0 (- img-width win-width)))
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(image-set-window-vscroll (max 0 (- img-height win-height)))))
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;; Adjust frame and image size.
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(defun image-mode-fit-frame ()
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"Fit the frame to the current image.
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This function assumes the current frame has only one window."
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;; FIXME: This does not take into account decorations like mode-line,
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;; minibuffer, header-line, ...
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(interactive)
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(let* ((saved (frame-parameter nil 'image-mode-saved-size))
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(display (image-get-display-property))
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(size (image-size display)))
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(if (and saved
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(eq (caar saved) (frame-width))
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(eq (cdar saved) (frame-height)))
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(progn ;; Toggle back to previous non-fitted size.
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(set-frame-parameter nil 'image-mode-saved-size nil)
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(setq size (cdr saved)))
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;; Round up size, and save current size so we can toggle back to it.
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(setcar size (ceiling (car size)))
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(setcdr size (ceiling (cdr size)))
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(set-frame-parameter nil 'image-mode-saved-size
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(cons size (cons (frame-width) (frame-height)))))
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(set-frame-width (selected-frame) (car size))
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(set-frame-height (selected-frame) (cdr size))))
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;;; Image Mode setup
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(defvar image-type nil
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"Current image type.
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This variable is used to display the current image type in the mode line.")
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(make-variable-buffer-local 'image-type)
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(defvar image-mode-map
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(let ((map (make-sparse-keymap)))
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(suppress-keymap map)
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(define-key map "q" 'quit-window)
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(define-key map "\C-c\C-c" 'image-toggle-display)
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(define-key map (kbd "SPC") 'image-scroll-up)
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(define-key map (kbd "DEL") 'image-scroll-down)
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(define-key map [remap forward-char] 'image-forward-hscroll)
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(define-key map [remap backward-char] 'image-backward-hscroll)
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(define-key map [remap previous-line] 'image-previous-line)
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(define-key map [remap next-line] 'image-next-line)
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(define-key map [remap scroll-up] 'image-scroll-up)
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(define-key map [remap scroll-down] 'image-scroll-down)
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(define-key map [remap move-beginning-of-line] 'image-bol)
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(define-key map [remap move-end-of-line] 'image-eol)
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(define-key map [remap beginning-of-buffer] 'image-bob)
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(define-key map [remap end-of-buffer] 'image-eob)
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map)
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"Major mode keymap for viewing images in Image mode.")
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(defvar image-mode-text-map
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(let ((map (make-sparse-keymap)))
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(define-key map "\C-c\C-c" 'image-toggle-display)
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map)
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"Major mode keymap for viewing images as text in Image mode.")
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(defvar bookmark-make-record-function)
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;;;###autoload
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(defun image-mode ()
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"Major mode for image files.
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You can use \\<image-mode-map>\\[image-toggle-display]
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to toggle between display as an image and display as text."
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(interactive)
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(kill-all-local-variables)
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(setq major-mode 'image-mode)
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;; Use our own bookmarking function for images.
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(set (make-local-variable 'bookmark-make-record-function)
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'image-bookmark-make-record)
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;; Keep track of [vh]scroll when switching buffers
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(image-mode-setup-winprops)
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(add-hook 'change-major-mode-hook 'image-toggle-display-text nil t)
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(if (display-images-p)
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(if (not (image-get-display-property))
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(image-toggle-display)
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;; Set next vars when image is already displayed but local
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;; variables were cleared by kill-all-local-variables
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(use-local-map image-mode-map)
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(setq cursor-type nil truncate-lines t
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image-type (plist-get (cdr (image-get-display-property)) :type)))
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(setq image-type "text")
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(use-local-map image-mode-text-map))
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(setq mode-name (format "Image[%s]" image-type))
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(run-mode-hooks 'image-mode-hook)
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(if (display-images-p)
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(message "%s" (concat
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(substitute-command-keys
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"Type \\[image-toggle-display] to view as ")
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(if (image-get-display-property)
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"text" "an image") "."))))
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;;;###autoload
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(define-minor-mode image-minor-mode
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"Toggle Image minor mode.
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With arg, turn Image minor mode on if arg is positive, off otherwise.
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See the command `image-mode' for more information on this mode."
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nil (:eval (format " Image[%s]" image-type)) image-mode-text-map
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:group 'image
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:version "22.1"
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(if (not image-minor-mode)
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(image-toggle-display-text)
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(image-mode-setup-winprops)
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(add-hook 'change-major-mode-hook (lambda () (image-minor-mode -1)) nil t)
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(if (display-images-p)
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(if (not (image-get-display-property))
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(image-toggle-display)
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(setq cursor-type nil truncate-lines t
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image-type (plist-get (cdr (image-get-display-property)) :type)))
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(setq image-type "text")
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(use-local-map image-mode-text-map))
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(if (display-images-p)
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(message "%s" (concat
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(substitute-command-keys
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"Type \\[image-toggle-display] to view the image as ")
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(if (image-get-display-property)
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"text" "an image") ".")))))
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;;;###autoload
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(defun image-mode-maybe ()
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"Set major or minor mode for image files.
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Set Image major mode only when there are no other major modes
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associated with a filename in `auto-mode-alist'. When an image
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filename matches another major mode in `auto-mode-alist' then
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set that major mode and Image minor mode.
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See commands `image-mode' and `image-minor-mode' for more
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information on these modes."
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(interactive)
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(let* ((mode-alist
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(delq nil (mapcar
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(lambda (elt)
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(unless (memq (or (car-safe (cdr elt)) (cdr elt))
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'(image-mode image-mode-maybe))
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elt))
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auto-mode-alist))))
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(if (assoc-default buffer-file-name mode-alist 'string-match)
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(let ((auto-mode-alist mode-alist)
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(magic-mode-alist nil))
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(set-auto-mode)
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(image-minor-mode t))
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(image-mode))))
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(defun image-toggle-display-text ()
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"Showing the text of the image file."
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(if (image-get-display-property)
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(image-toggle-display)))
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(defvar archive-superior-buffer)
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(defvar tar-superior-buffer)
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(declare-function image-refresh "image.c" (spec &optional frame))
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(defun image-toggle-display ()
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"Start or stop displaying an image file as the actual image.
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This command toggles between showing the text of the image file
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and showing the image as an image."
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(interactive)
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(if (image-get-display-property)
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(let ((inhibit-read-only t)
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(buffer-undo-list t)
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(modified (buffer-modified-p)))
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(remove-list-of-text-properties (point-min) (point-max)
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'(display intangible read-nonsticky
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read-only front-sticky))
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(set-buffer-modified-p modified)
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(kill-local-variable 'cursor-type)
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(kill-local-variable 'truncate-lines)
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(kill-local-variable 'auto-hscroll-mode)
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(use-local-map image-mode-text-map)
|
||
(setq image-type "text")
|
||
(if (eq major-mode 'image-mode)
|
||
(setq mode-name "Image[text]"))
|
||
(if (called-interactively-p)
|
||
(message "Repeat this command to go back to displaying the image")))
|
||
;; Turn the image data into a real image, but only if the whole file
|
||
;; was inserted
|
||
(let* ((filename (buffer-file-name))
|
||
(data-p (not (and filename
|
||
(file-readable-p filename)
|
||
(not (file-remote-p filename))
|
||
(not (buffer-modified-p))
|
||
(not (and (boundp 'archive-superior-buffer)
|
||
archive-superior-buffer))
|
||
(not (and (boundp 'tar-superior-buffer)
|
||
tar-superior-buffer)))))
|
||
(file-or-data (if data-p
|
||
(string-make-unibyte
|
||
(buffer-substring-no-properties (point-min) (point-max)))
|
||
filename))
|
||
(type (image-type file-or-data nil data-p))
|
||
(image (create-image file-or-data type data-p))
|
||
(props
|
||
`(display ,image
|
||
intangible ,image
|
||
rear-nonsticky (display intangible)
|
||
read-only t front-sticky (read-only)))
|
||
(inhibit-read-only t)
|
||
(buffer-undo-list t)
|
||
(modified (buffer-modified-p)))
|
||
(image-refresh image)
|
||
(let ((buffer-file-truename nil)) ; avoid changing dir mtime by lock_file
|
||
(add-text-properties (point-min) (point-max) props)
|
||
(restore-buffer-modified-p modified))
|
||
;; Inhibit the cursor when the buffer contains only an image,
|
||
;; because cursors look very strange on top of images.
|
||
(setq cursor-type nil)
|
||
;; This just makes the arrow displayed in the right fringe
|
||
;; area look correct when the image is wider than the window.
|
||
(setq truncate-lines t)
|
||
;; Allow navigation of large images
|
||
(set (make-local-variable 'auto-hscroll-mode) nil)
|
||
(use-local-map image-mode-map)
|
||
(setq image-type type)
|
||
(if (eq major-mode 'image-mode)
|
||
(setq mode-name (format "Image[%s]" type)))
|
||
(if (called-interactively-p)
|
||
(message "Repeat this command to go back to displaying the file as text")))))
|
||
|
||
;;; Support for bookmark.el
|
||
(declare-function bookmark-make-record-default "bookmark"
|
||
(&optional point-only))
|
||
(declare-function bookmark-prop-get "bookmark" (bookmark prop))
|
||
(declare-function bookmark-default-handler "bookmark" (bmk))
|
||
|
||
(defun image-bookmark-make-record ()
|
||
(nconc (bookmark-make-record-default)
|
||
`((image-type . ,image-type)
|
||
(handler . image-bookmark-jump))))
|
||
|
||
;;;###autoload
|
||
(defun image-bookmark-jump (bmk)
|
||
;; This implements the `handler' function interface for record type
|
||
;; returned by `bookmark-make-record-function', which see.
|
||
(prog1 (bookmark-default-handler bmk)
|
||
(when (not (string= image-type (bookmark-prop-get bmk 'image-type)))
|
||
(image-toggle-display))))
|
||
|
||
(provide 'image-mode)
|
||
|
||
;; arch-tag: b5b2b7e6-26a7-4b79-96e3-1546b5c4c6cb
|
||
;;; image-mode.el ends here
|