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2
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1 ;;; images.el --- Automatic image converters
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2 ;; Author: wmperry
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2
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3 ;; Created: 1996/06/30 18:00:34
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4 ;; Version: 1.2
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5 ;; Keywords: images
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6
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7 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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8 ;;; Copyright (c) 1995 - 1996 by William M. Perry (wmperry@cs.indiana.edu)
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9 ;;;
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10 ;;; This file is not part of GNU Emacs, but the same permissions apply.
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11 ;;;
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12 ;;; GNU Emacs is free software; you can redistribute it and/or modify
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13 ;;; it 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 ;;; GNU Emacs is distributed in the hope that it will be useful,
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18 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 ;;; GNU 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 GNU Emacs; see the file COPYING. If not, write to
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24 ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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25 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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26
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27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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28 ;;; The emacsen compatibility package - load it up before anything else
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29 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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30 (eval-and-compile
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31 (load-library "w3-sysdp"))
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32
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33 (defvar image-temp-stack nil "Do no touch - internal storage.")
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34 (defvar image-converters nil "Storage for the image converters.")
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35 (defvar image-native-formats
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36 (delq nil (cons (if (featurep 'x) 'xbm)
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37 (mapcar (function (lambda (x) (if (featurep x) x)))
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38 '(xpm gif jpeg tiff png))))
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39 "A list of image formats that this version of emacs supports natively.")
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40
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41 (defun image-register-converter (from to converter)
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42 "Register the image converter for FROM to TO. CONVERTER is the actual
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43 command used to convert the image. If this is a string, it will be executed
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44 in a subprocess. If a symbol, it is assumed to be a function. It will be
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45 called with two arguments, the start and end of the data to be converted.
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46 The function should replace that data with the new image data. The return
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47 value is not significant."
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48 (let* ((node (assq from image-converters))
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49 (replace (assq to (cdr-safe node))))
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50 (cond
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51 (replace ; Replace existing converter
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52 (setcdr replace converter)
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53 (display-warning 'image (format "Replacing image converter %s->%s"
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54 from to)))
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55 (node ; Add to existing node
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56 (setcdr node (cons (cons to converter) (cdr node))))
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57 (t ; New toplevel converter
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58 (setq image-converters (cons (cons from (list (cons to converter)))
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59 image-converters))))))
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60
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61 (defun image-unregister-converter (from to)
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62 "Unregister the image converter for FROM to TO"
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63 (let* ((node (assq from image-converters))
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64 (tos (cdr-safe node))
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65 (new nil))
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66 (while tos
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67 (if (eq to (car (car tos)))
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68 nil
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69 (setq new (cons (car tos) new)))
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70 (setq tos (cdr tos)))
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71 (setcdr node new)))
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72
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73 (defun image-converter-registered-p (from to)
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74 (cdr-safe (assq to (cdr-safe (assq from image-converters)))))
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75
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76 (defun image-converter-chain (from to)
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77 "Return the shortest converter chain for image format FROM to TO"
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78 (setq image-temp-stack (cons from image-temp-stack))
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79 (let ((converters (cdr-safe (assq from image-converters)))
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80 (thisone nil)
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81 (possibles nil)
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82 (done nil))
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83 (while (and (not done) converters)
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84 (setq thisone (car converters))
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85 (cond
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86 ((eq (car thisone) to)
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87 (setq done t))
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88 ((memq (car thisone) image-temp-stack)
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89 nil)
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90 (t
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91 (setq possibles (cons (image-converter-chain (car thisone) to)
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92 possibles))))
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93 (setq converters (cdr converters)))
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94 (setq image-temp-stack (cdr image-temp-stack)
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95 possibles (sort (delq nil possibles)
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96 (function
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97 (lambda (x y)
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98 (< (length (delete 'ignore x))
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99 (length (delete 'ignore y)))))))
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100 (if (not done)
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101 (setq done (car possibles)))
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102 (cond
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103 ((eq done t) (list (cdr thisone)))
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104 (done (setq done (cons (cdr thisone) done)))
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105 (t nil))))
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106
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107 (defun image-normalize (format data)
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108 "Return an image specification for XEmacs 19.13 and later. FORMAT specifies
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109 the image format, DATA is the image data as a string. Any conversions to get
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110 to a suitable internal image format will be carried out."
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111 (setq image-temp-stack nil)
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112 (if (stringp format) (setq format (intern format)))
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113 (if (not (memq format image-native-formats))
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114 (let* ((winner (car-safe
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115 (sort (mapcar
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116 (function
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117 (lambda (x)
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118 (cons x
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119 (delete 'ignore
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120 (image-converter-chain format
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121 x)))))
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122 image-native-formats)
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123 (function
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124 (lambda (x y)
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125 (cond
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126 ((null (cdr x)) nil)
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127 ((= (length (cdr x))
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128 (length (cdr y)))
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129 (< (length (memq (car x)
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130 image-native-formats))
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131 (length (memq (car y)
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132 image-native-formats))))
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133 (t
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134 (< (length (cdr x))
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135 (length (cdr y))))))))))
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136 (type (car-safe winner))
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137 (chain (cdr-safe winner))
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138 )
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139 (if chain
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140 (save-excursion
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141 (set-buffer (generate-new-buffer " *image-conversion*"))
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142 (erase-buffer)
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143 (insert data)
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144 (while chain
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145 (cond
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146 ((stringp (car chain))
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147 (shell-command-on-region (point-min) (point-max)
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148 (concat
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149 "/bin/sh -c '"
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150 (car chain)
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151 " 2> /dev/null"
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152 "'") t))
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153 ((and (symbolp (car chain)) (fboundp (car chain)))
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154 (funcall (car chain) (point-min) (point-max))))
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155 (setq chain (cdr chain)))
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156 (setq data (buffer-string))
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157 (kill-buffer (current-buffer)))
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158 (setq type format))
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159 (vector type ':data data))
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160 (vector format ':data data)))
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161
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162 (defun image-register-netpbm-utilities ()
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163 "Register all the netpbm utility packages converters."
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164 (interactive)
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165 (if (image-converter-registered-p 'xpm 'gif)
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166 nil
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167 (image-register-converter 'pgm 'pbm "pgmtopbm")
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168 (image-register-converter 'ppm 'pgm "ppmtopgm")
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169 (image-register-converter 'pnm 'xpm "(ppmquant 256 | ppmtoxpm)")
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170 (image-register-converter 'ppm 'xpm "(ppmquant 256 | ppmtoxpm)")
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171 (image-register-converter 'xpm 'ppm "xpmtoppm")
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172 (image-register-converter 'gif 'ppm "giftopnm")
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173 (image-register-converter 'pnm 'gif "(ppmquant 256 | ppmtogif)")
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174 (image-register-converter 'ppm 'gif "(ppmquant 256 | ppmtogif)")
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175 (image-register-converter 'bmp 'ppm "bmptoppm")
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176 (image-register-converter 'ppm 'bmp "ppmtobmp")
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177 (image-register-converter 'ppm 'ps "pnmtops")
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178 (image-register-converter 'pnm 'ps "pnmtops")
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179 (image-register-converter 'ps 'pnm "pstopnm")
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180 (image-register-converter 'g3 'pbm "g3topbm")
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181 (image-register-converter 'macpt 'pbm "macptopbm")
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182 (image-register-converter 'pbm 'macpt "pbmtomacp")
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183 (image-register-converter 'pcx 'ppm "pcxtoppm")
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184 (image-register-converter 'ppm 'pcx "ppmtopcx")
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185 (image-register-converter 'pict 'ppm "picttoppm")
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186 (image-register-converter 'ppm 'pict "ppmtopict")
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187 (image-register-converter 'pnm 'sgi "pnmtosgi")
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188 (image-register-converter 'tga 'ppm "tgatoppm")
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189 (image-register-converter 'ppm 'tga "ppmtotga")
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190 (image-register-converter 'sgi 'pnm "sgitopnm")
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191 (image-register-converter 'tiff 'pnm "tifftopnm")
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192 (image-register-converter 'pnm 'tiff "pnmtotiff")
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193 (image-register-converter 'xbm 'pbm "xbmtopbm")
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194 (image-register-converter 'pbm 'xbm "pbmtoxbm")
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195 (image-register-converter 'png 'pnm "pngtopnm")
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196 (image-register-converter 'pnm 'png "pnmtopng")
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197 (image-register-converter 'pnm 'jbg "pbmtojbg")
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198 (image-register-converter 'jbg 'pnm "jbgtopbm")
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199 (image-register-converter 'jpeg 'ppm "djpeg")))
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200
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201 (provide 'images)
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