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167
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1 ;;; image-mode.el --- Major mode for navigate images
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2
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3 ;; Copyright (C) 1997 MORIOKA Tomohiko
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Created: 1997/6/27
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169
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7 ;; Version: image-mode.el,v 20.3.1.2 1997/07/01 17:29:44 morioka Exp
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167
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8 ;; Keywords: image, graphics
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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25 ;; 02111-1307, USA.
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26
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27 ;;; Code:
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28
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29 (defvar buffer-image-format nil)
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30 (make-variable-buffer-local 'buffer-image-format)
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31
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32 (defsubst image-decode (start end type)
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33 "Decode the image between START and END which is encoded in TYPE."
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34 (save-excursion
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35 (let ((image (make-image-instance
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36 (vector type :data (buffer-string)) nil nil 'no-error)))
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37 (delete-region start end)
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38 (if image
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39 (let ((glyph (make-glyph image)))
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40 (set-extent-begin-glyph (make-extent start start) glyph)
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41 (setq buffer-read-only t)
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42 )
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43 (insert (format "%s is not supported!\n" type))
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44 (let ((overriding-local-map image-mode-map))
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45 (insert
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46 (substitute-command-keys
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47 "
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48 Please type `\\[image-toggle-decoding]' if you would like to display
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49 raw data.
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50 Please type `\\[image-enter-hexl-mode]' if you would like to edit hex
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51 data.
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52 Please type `\\[image-start-external-viewer]' if you would like to
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53 display contents of this buffer by external viewer.\n")))
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54 (call-interactively 'fill-paragraph)
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55 )
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56 start)))
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57
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58 (defvar image-mode-map (make-keymap))
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59 (suppress-keymap image-mode-map)
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60 (define-key image-mode-map "v" 'image-start-external-viewer)
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61 (define-key image-mode-map "t" 'image-toggle-decoding)
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62 (define-key image-mode-map "h" 'image-enter-hexl-mode)
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63 (define-key image-mode-map "q" 'image-mode-quit)
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64
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65 (defvar image-external-viewer
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66 (cond ((exec-installed-p "display") "display") ; ImageMagic
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67 ((exec-installed-p "xv") "xv") ; xv
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68 )
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69 "*External viewer for image-mode.")
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70
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71 (defun image-start-external-viewer ()
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72 "Start external image viewer for current-buffer.
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73 It uses `image-external-viewer' as external image viewer."
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74 (interactive)
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75 (start-process "external image viewer" nil
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76 image-external-viewer buffer-file-name)
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77 )
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78
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79 (defun image-toggle-decoding ()
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80 "Toggle image display mode in current buffer."
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81 (interactive)
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82 (if buffer-file-format
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83 (progn
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84 (setq buffer-read-only nil)
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85 (erase-buffer)
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86 (map-extents (function
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87 (lambda (extent maparg)
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88 (delete-extent extent)
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89 )) nil (point-min)(point-min))
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90 (setq buffer-file-format nil)
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91 (insert-file-contents-literally buffer-file-name)
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92 (set-buffer-modified-p nil)
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93 )
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94 (format-decode-buffer buffer-image-format)
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95 ))
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96
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97 (defun image-exit-hexl-mode-function ()
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98 (format-decode-buffer)
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99 (remove-hook 'hexl-mode-exit-hook 'image-exit-hexl-mode-function)
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100 )
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101
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102 (defun image-enter-hexl-mode ()
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103 "Enter to hexl-mode."
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104 (interactive)
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105 (when buffer-file-format
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106 (setq buffer-read-only nil)
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107 (erase-buffer)
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108 (map-extents (function
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109 (lambda (extent maparg)
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110 (delete-extent extent)
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111 )) nil (point-min)(point-min))
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112 (setq buffer-file-format nil)
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113 (insert-file-contents-literally buffer-file-name)
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114 (set-buffer-modified-p nil)
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115 (add-hook 'hexl-mode-exit-hook 'image-exit-hexl-mode-function)
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116 )
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117 (hexl-mode)
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118 )
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119
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120 (defun image-mode-quit ()
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121 "Exit image-mode."
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122 (interactive)
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123 (kill-buffer (current-buffer))
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124 )
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125
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169
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126 (defun image-maybe-restore ()
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127 "Restore buffer from file if it is decoded as `buffer-file-format'."
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128 (when (and buffer-file-format
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129 buffer-file-name)
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130 (setq buffer-read-only nil)
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131 (erase-buffer)
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132 (map-extents (function
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133 (lambda (extent maparg)
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134 (delete-extent extent)
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135 )) nil (point-min)(point-min))
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136 (setq buffer-file-format nil)
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137 (insert-file-contents-literally buffer-file-name)
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138 (set-buffer-modified-p nil)
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139 ))
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140
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141 (add-hook 'change-major-mode-hook 'image-maybe-restore)
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142
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143
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167
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144 ;;;###autoload
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145 (defun image-mode (&optional arg)
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146 "\\{image-mode-map}"
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147 (interactive)
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148 (setq major-mode 'image-mode)
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149 (setq mode-name "Image")
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150 (use-local-map image-mode-map)
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151 )
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152
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153 ;;;###autoload
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154 (defun image-decode-jpeg (start end)
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155 "Decode JPEG image between START and END."
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156 (setq buffer-image-format 'image/jpeg)
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157 (image-decode start end 'jpeg)
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158 )
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159
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160 ;;;###autoload
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161 (defun image-decode-gif (start end)
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162 "Decode GIF image between START and END."
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163 (setq buffer-image-format 'image/gif)
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164 (image-decode start end 'gif)
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165 )
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166
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167 ;;;###autoload
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168 (defun image-decode-png (start end)
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169 "Decode PNG image between START and END."
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170 (setq buffer-image-format 'image/png)
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171 (image-decode start end 'png)
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172 )
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173
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174 ;;;###autoload
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175 (defun image-decode-xpm (start end)
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176 "Decode XPM image between START and END."
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177 (setq buffer-image-format 'image/x-xpm)
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178 (image-decode start end 'xpm)
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179 )
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180
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181 (provide 'image-mode)
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182
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183 ;;; image-mode.el ends here
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