;;; tm-image.el --- tm-view filter to display images in XEmacs or MULE buffers

;; Copyright (C) 1995,1996,1997 MORIOKA Tomohiko
;; Copyright (C) 1996 Dan Rich

;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;;         Dan Rich <drich@morpheus.corp.sgi.com>
;; Maintainer: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Created: 1995/12/15
;; Version: $Id: tm-image.el,v 1.7 1997/06/06 00:57:43 steve Exp $

;; Keywords: image, picture, X-Face, MIME, multimedia, mail, news

;; This file is part of XEmacs.

;; This program 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.

;; This program 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 XEmacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:
;;	If you use this program with MULE, please install
;;	etl8x16-bitmap.bdf font included in tl package.

;;; Code:

(require 'tm-view)

(cond (running-xemacs
       (require 'images)
       
       (defun-maybe image-inline-p (format)
	 (or (memq format image-native-formats)
	     (find-if (function
		       (lambda (native)
			 (image-converter-chain format native)
			 ))
		      image-native-formats)
	     ))
       
       (image-register-netpbm-utilities)
       (image-register-converter 'pic 'ppm "pictoppm")
       (image-register-converter 'mag 'ppm "magtoppm")
       
       (defun bitmap-insert-xbm-file (file)
	 (let ((gl (make-glyph (list (cons 'x file))))
	       (e (make-extent (point) (point)))
	       )
	   (set-extent-end-glyph e gl)
	   ))
       
       ;;
       ;; X-Face
       ;;
       (autoload 'highlight-headers "highlight-headers")
       
       (defun mime-preview/x-face-function-use-highlight-headers ()
	 (highlight-headers (point-min) (re-search-forward "^$" nil t) t)
	 )
       
       (add-hook 'mime-viewer/content-header-filter-hook
		 'mime-preview/x-face-function-use-highlight-headers)
       
       )
      ((featurep 'mule)
       ;; for MULE 2.* or mule merged EMACS
       (require 'x-face-mule)

       (defvar image-native-formats '(xbm))
       
       (defun-maybe image-inline-p (format)
	 (memq format image-native-formats)
	 )
       
       (defun-maybe image-normalize (format data)
	 (and (eq format 'xbm)
	      (vector 'xbm ':data data)
	      ))
       
       ;;
       ;; X-Face
       ;;
       (if (exec-installed-p uncompface-program)
	   (add-hook 'mime-viewer/content-header-filter-hook
		     'x-face-decode-message-header)
	 )
       ))

(or (fboundp 'image-invalid-glyph-p)
    (defsubst image-invalid-glyph-p (glyph)
      (or (null (aref glyph 0))
	  (null (aref glyph 2))
	  (equal (aref glyph 2) "")
	  ))
    )

(defvar mime-viewer/image-converter-alist nil)

(mapcar (function
	 (lambda (rule)
	   (let ((ctype  (car rule))
		 (format (cdr rule))
		 )
	     (if (image-inline-p format)
		 (progn
		   (set-alist 'mime-viewer/content-filter-alist
			      ctype
			      (function mime-preview/filter-for-image))
		   (set-alist 'mime-viewer/image-converter-alist
			      ctype format)
		   (add-to-list
		    'mime-viewer/default-showing-Content-Type-list
		    ctype)
		   )
	       ))))
	'(("image/jpeg"			. jpeg)
	  ("image/gif"			. gif)
	  ("image/tiff"			. tiff)
	  ("image/x-tiff"		. tiff)
	  ("image/xbm"			. xbm)
	  ("image/x-xbm"		. xbm)
	  ("image/x-xpixmap"		. xpm)
	  ("image/x-pic"		. pic)
	  ("image/x-mag"		. mag)
	  ("image/png"			. png)
	  ))

(defvar mime-viewer/ps-to-gif-command "pstogif")


;;; @ content filter for images
;;;
;;    (for XEmacs 19.12 or later)

(defun mime-preview/filter-for-image (ctype params encoding)
  (let* ((mode mime::preview/original-major-mode)
	 (m (assq mode mime-viewer/code-converter-alist))
	 (charset (assoc "charset" params))
	 (beg (point-min)) (end (point-max))
	 )
    (remove-text-properties beg end '(face nil))
    (message "Decoding image...")
    (mime-decode-region beg end encoding)
    (let* ((minor (assoc-value ctype mime-viewer/image-converter-alist))
	   (gl (image-normalize minor (buffer-string)))
	   e)
      (delete-region (point-min)(point-max))
      (cond ((image-invalid-glyph-p gl)
	     (setq gl nil)
	     (message "Invalid glyph!")
	     )
	    ((eq (aref gl 0) 'xbm)
	     (let ((xbm-file
		    (make-temp-name (expand-file-name "tm" mime/tmp-dir))))
	       (insert (aref gl 2))
	       (write-region (point-min)(point-max) xbm-file)
	       (message "Decoding image...")
	       (delete-region (point-min)(point-max))
	       (bitmap-insert-xbm-file xbm-file)
	       (delete-file xbm-file)
	       )
	     (message "Decoding image... done")
	     )
	    (t
	     (setq gl (make-glyph gl))
	     (setq e (make-extent (point) (point)))
	     (set-extent-end-glyph e gl)
	     (message "Decoding image... done")
	     ))
      )
    (insert "\n")
    ))


;;; @ content filter for Postscript
;;;
;;    (for XEmacs 19.14 or later)

(defun mime-preview/filter-for-application/postscript (ctype params encoding)
  (let* ((mode mime::preview/original-major-mode)
	 (m (assq mode mime-viewer/code-converter-alist))
	 (beg (point-min)) (end (point-max))
	 (file-base (make-temp-name (expand-file-name "tm" mime/tmp-dir)))
	 (ps-file (concat file-base ".ps"))
	 (gif-file (concat file-base ".gif"))
	 )
    (remove-text-properties beg end '(face nil))
    (message "Decoding Postscript...")
    (mime-decode-region beg end encoding)
    (write-region (point-min)(point-max) ps-file) 
    (message "Decoding Postscript...")
    (delete-region (point-min)(point-max))
    (call-process mime-viewer/ps-to-gif-command nil nil nil ps-file)
    (set-extent-end-glyph (make-extent (point) (point))
			  (make-glyph (vector 'gif :file gif-file)))
    (message "Decoding Postscript... done")
    (delete-file ps-file)
    (delete-file gif-file)
    ))

(set-alist 'mime-viewer/content-filter-alist
	   "application/postscript"
	   (function mime-preview/filter-for-application/postscript))

(if (featurep 'gif)
    (add-to-list 'mime-viewer/default-showing-Content-Type-list
		 "application/postscript")
  )


;;; @ end
;;;

(provide 'tm-image)

;;; tm-image.el ends here