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729 lines
26 KiB
EmacsLisp
729 lines
26 KiB
EmacsLisp
;;; image.el --- image API
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;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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;; 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: multimedia
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;; Package: emacs
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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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;;; Code:
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(defgroup image ()
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"Image support."
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:group 'multimedia)
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(defalias 'image-refresh 'image-flush)
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(defconst image-type-header-regexps
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`(("\\`/[\t\n\r ]*\\*.*XPM.\\*/" . xpm)
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("\\`P[1-6][[:space:]]+\\(?:#.*[[:space:]]+\\)*[0-9]+[[:space:]]+[0-9]+" . pbm)
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("\\`GIF8[79]a" . gif)
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("\\`\x89PNG\r\n\x1a\n" . png)
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("\\`[\t\n\r ]*#define \\([a-z0-9_]+\\)_width [0-9]+\n\
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#define \\1_height [0-9]+\n\\(\
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#define \\1_x_hot [0-9]+\n\
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#define \\1_y_hot [0-9]+\n\\)?\
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static \\(unsigned \\)?char \\1_bits" . xbm)
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("\\`\\(?:MM\0\\*\\|II\\*\0\\)" . tiff)
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("\\`[\t\n\r ]*%!PS" . postscript)
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("\\`\xff\xd8" . jpeg) ; used to be (image-jpeg-p . jpeg)
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(,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
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(comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
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(concat "\\(?:<\\?xml[ \t\r\n]+[^>]*>\\)?[ \t\r\n]*<"
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comment-re "*"
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"\\(?:!DOCTYPE[ \t\r\n]+[^>]*>[ \t\r\n]*<[ \t\r\n]*" comment-re "*\\)?"
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"[Ss][Vv][Gg]"))
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. svg)
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)
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"Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
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When the first bytes of an image file match REGEXP, it is assumed to
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be of image type IMAGE-TYPE if IMAGE-TYPE is a symbol. If not a symbol,
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IMAGE-TYPE must be a pair (PREDICATE . TYPE). PREDICATE is called
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with one argument, a string containing the image data. If PREDICATE returns
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a non-nil value, TYPE is the image's type.")
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(defconst image-type-file-name-regexps
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'(("\\.png\\'" . png)
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("\\.gif\\'" . gif)
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("\\.jpe?g\\'" . jpeg)
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("\\.bmp\\'" . bmp)
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("\\.xpm\\'" . xpm)
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("\\.pbm\\'" . pbm)
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("\\.xbm\\'" . xbm)
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("\\.ps\\'" . postscript)
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("\\.tiff?\\'" . tiff)
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("\\.svgz?\\'" . svg)
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)
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"Alist of (REGEXP . IMAGE-TYPE) pairs used to identify image files.
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When the name of an image file match REGEXP, it is assumed to
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be of image type IMAGE-TYPE.")
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;; We rely on `auto-mode-alist' to detect xbm and xpm files, instead
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;; of content autodetection. Their contents are just C code, so it is
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;; easy to generate false matches.
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(defvar image-type-auto-detectable
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'((pbm . t)
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(xbm . nil)
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(bmp . maybe)
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(gif . maybe)
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(png . maybe)
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(xpm . nil)
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(jpeg . maybe)
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(tiff . maybe)
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(svg . maybe)
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(postscript . nil))
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"Alist of (IMAGE-TYPE . AUTODETECT) pairs used to auto-detect image files.
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\(See `image-type-auto-detected-p').
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AUTODETECT can be
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- t always auto-detect.
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- nil never auto-detect.
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- maybe auto-detect only if the image type is available
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(see `image-type-available-p').")
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(defcustom image-load-path
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(list (file-name-as-directory (expand-file-name "images" data-directory))
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'data-directory 'load-path)
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"List of locations in which to search for image files.
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If an element is a string, it defines a directory to search.
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If an element is a variable symbol whose value is a string, that
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value defines a directory to search.
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If an element is a variable symbol whose value is a list, the
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value is used as a list of directories to search."
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:type '(repeat (choice directory variable))
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:initialize 'custom-initialize-delay)
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(defun image-load-path-for-library (library image &optional path no-error)
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"Return a suitable search path for images used by LIBRARY.
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It searches for IMAGE in `image-load-path' (excluding
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\"`data-directory'/images\") and `load-path', followed by a path
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suitable for LIBRARY, which includes \"../../etc/images\" and
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\"../etc/images\" relative to the library file itself, and then
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in \"`data-directory'/images\".
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Then this function returns a list of directories which contains
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first the directory in which IMAGE was found, followed by the
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value of `load-path'. If PATH is given, it is used instead of
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`load-path'.
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If NO-ERROR is non-nil and a suitable path can't be found, don't
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signal an error. Instead, return a list of directories as before,
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except that nil appears in place of the image directory.
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Here is an example that uses a common idiom to provide
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compatibility with versions of Emacs that lack the variable
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`image-load-path':
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;; Shush compiler.
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(defvar image-load-path)
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(let* ((load-path (image-load-path-for-library \"mh-e\" \"mh-logo.xpm\"))
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(image-load-path (cons (car load-path)
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(when (boundp 'image-load-path)
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image-load-path))))
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(mh-tool-bar-folder-buttons-init))"
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(unless library (error "No library specified"))
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(unless image (error "No image specified"))
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(let (image-directory image-directory-load-path)
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;; Check for images in image-load-path or load-path.
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(let ((img image)
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(dir (or
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;; Images in image-load-path.
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(image-search-load-path image)
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;; Images in load-path.
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(locate-library image)))
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parent)
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;; Since the image might be in a nested directory (for
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;; example, mail/attach.pbm), adjust `image-directory'
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;; accordingly.
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(when dir
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(setq dir (file-name-directory dir))
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(while (setq parent (file-name-directory img))
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(setq img (directory-file-name parent)
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dir (expand-file-name "../" dir))))
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(setq image-directory-load-path dir))
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;; If `image-directory-load-path' isn't Emacs' image directory,
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;; it's probably a user preference, so use it. Then use a
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;; relative setting if possible; otherwise, use
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;; `image-directory-load-path'.
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(cond
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;; User-modified image-load-path?
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((and image-directory-load-path
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(not (equal image-directory-load-path
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(file-name-as-directory
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(expand-file-name "images" data-directory)))))
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(setq image-directory image-directory-load-path))
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;; Try relative setting.
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((let (library-name d1ei d2ei)
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;; First, find library in the load-path.
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(setq library-name (locate-library library))
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(if (not library-name)
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(error "Cannot find library %s in load-path" library))
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;; And then set image-directory relative to that.
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(setq
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;; Go down 2 levels.
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d2ei (file-name-as-directory
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(expand-file-name
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(concat (file-name-directory library-name) "../../etc/images")))
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;; Go down 1 level.
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d1ei (file-name-as-directory
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(expand-file-name
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(concat (file-name-directory library-name) "../etc/images"))))
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(setq image-directory
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;; Set it to nil if image is not found.
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(cond ((file-exists-p (expand-file-name image d2ei)) d2ei)
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((file-exists-p (expand-file-name image d1ei)) d1ei)))))
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;; Use Emacs' image directory.
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(image-directory-load-path
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(setq image-directory image-directory-load-path))
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(no-error
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(message "Could not find image %s for library %s" image library))
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(t
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(error "Could not find image %s for library %s" image library)))
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;; Return an augmented `path' or `load-path'.
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(nconc (list image-directory)
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(delete image-directory (copy-sequence (or path load-path))))))
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(defun image-jpeg-p (data)
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"Value is non-nil if DATA, a string, consists of JFIF image data.
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We accept the tag Exif because that is the same format."
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(setq data (ignore-errors (string-to-unibyte data)))
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(when (and data (string-match-p "\\`\xff\xd8" data))
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(catch 'jfif
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(let ((len (length data)) (i 2))
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(while (< i len)
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(when (/= (aref data i) #xff)
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(throw 'jfif nil))
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(setq i (1+ i))
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(when (>= (+ i 2) len)
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(throw 'jfif nil))
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(let ((nbytes (+ (lsh (aref data (+ i 1)) 8)
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(aref data (+ i 2))))
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(code (aref data i)))
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(when (and (>= code #xe0) (<= code #xef))
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;; APP0 LEN1 LEN2 "JFIF\0"
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(throw 'jfif
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(string-match-p "JFIF\\|Exif"
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(substring data i (min (+ i nbytes) len)))))
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(setq i (+ i 1 nbytes))))))))
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;;;###autoload
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(defun image-type-from-data (data)
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"Determine the image type from image data DATA.
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Value is a symbol specifying the image type or nil if type cannot
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be determined."
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(let ((types image-type-header-regexps)
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type)
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(while types
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(let ((regexp (car (car types)))
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(image-type (cdr (car types))))
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(if (or (and (symbolp image-type)
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(string-match-p regexp data))
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(and (consp image-type)
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(funcall (car image-type) data)
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(setq image-type (cdr image-type))))
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(setq type image-type
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types nil)
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(setq types (cdr types)))))
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type))
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;;;###autoload
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(defun image-type-from-buffer ()
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"Determine the image type from data in the current buffer.
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Value is a symbol specifying the image type or nil if type cannot
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be determined."
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(let ((types image-type-header-regexps)
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type
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(opoint (point)))
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(goto-char (point-min))
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(while types
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(let ((regexp (car (car types)))
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(image-type (cdr (car types)))
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data)
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(if (or (and (symbolp image-type)
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(looking-at-p regexp))
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(and (consp image-type)
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(funcall (car image-type)
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(or data
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(setq data
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(buffer-substring
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(point-min)
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(min (point-max)
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(+ (point-min) 256))))))
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(setq image-type (cdr image-type))))
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(setq type image-type
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types nil)
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(setq types (cdr types)))))
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(goto-char opoint)
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type))
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;;;###autoload
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(defun image-type-from-file-header (file)
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"Determine the type of image file FILE from its first few bytes.
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Value is a symbol specifying the image type, or nil if type cannot
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be determined."
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(unless (or (file-readable-p file)
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(file-name-absolute-p file))
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(setq file (image-search-load-path file)))
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(and file
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(file-readable-p file)
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(with-temp-buffer
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(set-buffer-multibyte nil)
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(insert-file-contents-literally file nil 0 256)
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(image-type-from-buffer))))
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;;;###autoload
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(defun image-type-from-file-name (file)
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"Determine the type of image file FILE from its name.
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Value is a symbol specifying the image type, or nil if type cannot
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be determined."
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(assoc-default file image-type-file-name-regexps 'string-match-p))
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;;;###autoload
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(defun image-type (source &optional type data-p)
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"Determine and return image type.
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SOURCE is an image file name or image data.
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Optional TYPE is a symbol describing the image type. If TYPE is omitted
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or nil, try to determine the image type from its first few bytes
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of image data. If that doesn't work, and SOURCE is a file name,
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use its file extension as image type.
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Optional DATA-P non-nil means SOURCE is a string containing image data."
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(when (and (not data-p) (not (stringp source)))
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(error "Invalid image file name `%s'" source))
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(unless type
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(setq type (if data-p
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(image-type-from-data source)
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(or (image-type-from-file-header source)
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(image-type-from-file-name source))))
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(or type (error "Cannot determine image type")))
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(or (memq type (and (boundp 'image-types) image-types))
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(error "Invalid image type `%s'" type))
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type)
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(define-obsolete-variable-alias
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'image-library-alist
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'dynamic-library-alist "24.1")
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;;;###autoload
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(defun image-type-available-p (type)
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"Return non-nil if image type TYPE is available.
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Image types are symbols like `xbm' or `jpeg'."
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(and (fboundp 'init-image-library)
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(init-image-library type dynamic-library-alist)))
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;;;###autoload
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(defun image-type-auto-detected-p ()
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"Return t if the current buffer contains an auto-detectable image.
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This function is intended to be used from `magic-fallback-mode-alist'.
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The buffer is considered to contain an auto-detectable image if
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its beginning matches an image type in `image-type-header-regexps',
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and that image type is present in `image-type-auto-detectable' with a
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non-nil value. If that value is non-nil, but not t, then the image type
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must be available."
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(let* ((type (image-type-from-buffer))
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(auto (and type (cdr (assq type image-type-auto-detectable)))))
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(and auto
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(or (eq auto t) (image-type-available-p type)))))
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;;;###autoload
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(defun create-image (file-or-data &optional type data-p &rest props)
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"Create an image.
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FILE-OR-DATA is an image file name or image data.
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Optional TYPE is a symbol describing the image type. If TYPE is omitted
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or nil, try to determine the image type from its first few bytes
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of image data. If that doesn't work, and FILE-OR-DATA is a file name,
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use its file extension as image type.
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Optional DATA-P non-nil means FILE-OR-DATA is a string containing image data.
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Optional PROPS are additional image attributes to assign to the image,
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like, e.g. `:mask MASK'.
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Value is the image created, or nil if images of type TYPE are not supported.
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Images should not be larger than specified by `max-image-size'.
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Image file names that are not absolute are searched for in the
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\"images\" sub-directory of `data-directory' and
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`x-bitmap-file-path' (in that order)."
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;; It is x_find_image_file in image.c that sets the search path.
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(setq type (image-type file-or-data type data-p))
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(when (image-type-available-p type)
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(append (list 'image :type type (if data-p :data :file) file-or-data)
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props)))
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;;;###autoload
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(defun put-image (image pos &optional string area)
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"Put image IMAGE in front of POS in the current buffer.
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IMAGE must be an image created with `create-image' or `defimage'.
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IMAGE is displayed by putting an overlay into the current buffer with a
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`before-string' STRING that has a `display' property whose value is the
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image. STRING is defaulted if you omit it.
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POS may be an integer or marker.
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AREA is where to display the image. AREA nil or omitted means
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display it in the text area, a value of `left-margin' means
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display it in the left marginal area, a value of `right-margin'
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means display it in the right marginal area."
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(unless string (setq string "x"))
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(let ((buffer (current-buffer)))
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(unless (eq (car-safe image) 'image)
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(error "Not an image: %s" image))
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(unless (or (null area) (memq area '(left-margin right-margin)))
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(error "Invalid area %s" area))
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(setq string (copy-sequence string))
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(let ((overlay (make-overlay pos pos buffer))
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(prop (if (null area) image (list (list 'margin area) image))))
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(put-text-property 0 (length string) 'display prop string)
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(overlay-put overlay 'put-image t)
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(overlay-put overlay 'before-string string))))
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;;;###autoload
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(defun insert-image (image &optional string area slice)
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"Insert IMAGE into current buffer at point.
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IMAGE is displayed by inserting STRING into the current buffer
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with a `display' property whose value is the image. STRING is
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defaulted if you omit it.
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AREA is where to display the image. AREA nil or omitted means
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display it in the text area, a value of `left-margin' means
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display it in the left marginal area, a value of `right-margin'
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means display it in the right marginal area.
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SLICE specifies slice of IMAGE to insert. SLICE nil or omitted
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means insert whole image. SLICE is a list (X Y WIDTH HEIGHT)
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specifying the X and Y positions and WIDTH and HEIGHT of image area
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to insert. A float value 0.0 - 1.0 means relative to the width or
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height of the image; integer values are taken as pixel values."
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;; Use a space as least likely to cause trouble when it's a hidden
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;; character in the buffer.
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(unless string (setq string " "))
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(unless (eq (car-safe image) 'image)
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(error "Not an image: %s" image))
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(unless (or (null area) (memq area '(left-margin right-margin)))
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(error "Invalid area %s" area))
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(if area
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(setq image (list (list 'margin area) image))
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;; Cons up a new spec equal but not eq to `image' so that
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;; inserting it twice in a row (adjacently) displays two copies of
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;; the image. Don't try to avoid this by looking at the display
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;; properties on either side so that we DTRT more often with
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;; cut-and-paste. (Yanking killed image text next to another copy
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;; of it loses anyway.)
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(setq image (cons 'image (cdr image))))
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(let ((start (point)))
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(insert string)
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(add-text-properties start (point)
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||
`(display ,(if slice
|
||
(list (cons 'slice slice) image)
|
||
image) rear-nonsticky (display)))))
|
||
|
||
|
||
;;;###autoload
|
||
(defun insert-sliced-image (image &optional string area rows cols)
|
||
"Insert IMAGE into current buffer at point.
|
||
IMAGE is displayed by inserting STRING into the current buffer
|
||
with a `display' property whose value is the image. STRING is
|
||
defaulted if you omit it.
|
||
AREA is where to display the image. AREA nil or omitted means
|
||
display it in the text area, a value of `left-margin' means
|
||
display it in the left marginal area, a value of `right-margin'
|
||
means display it in the right marginal area.
|
||
The image is automatically split into ROWS x COLS slices."
|
||
(unless string (setq string " "))
|
||
(unless (eq (car-safe image) 'image)
|
||
(error "Not an image: %s" image))
|
||
(unless (or (null area) (memq area '(left-margin right-margin)))
|
||
(error "Invalid area %s" area))
|
||
(if area
|
||
(setq image (list (list 'margin area) image))
|
||
;; Cons up a new spec equal but not eq to `image' so that
|
||
;; inserting it twice in a row (adjacently) displays two copies of
|
||
;; the image. Don't try to avoid this by looking at the display
|
||
;; properties on either side so that we DTRT more often with
|
||
;; cut-and-paste. (Yanking killed image text next to another copy
|
||
;; of it loses anyway.)
|
||
(setq image (cons 'image (cdr image))))
|
||
(let ((x 0.0) (dx (/ 1.0001 (or cols 1)))
|
||
(y 0.0) (dy (/ 1.0001 (or rows 1))))
|
||
(while (< y 1.0)
|
||
(while (< x 1.0)
|
||
(let ((start (point)))
|
||
(insert string)
|
||
(add-text-properties start (point)
|
||
`(display ,(list (list 'slice x y dx dy) image)
|
||
rear-nonsticky (display)))
|
||
(setq x (+ x dx))))
|
||
(setq x 0.0
|
||
y (+ y dy))
|
||
(insert (propertize "\n" 'line-height t)))))
|
||
|
||
|
||
|
||
;;;###autoload
|
||
(defun remove-images (start end &optional buffer)
|
||
"Remove images between START and END in BUFFER.
|
||
Remove only images that were put in BUFFER with calls to `put-image'.
|
||
BUFFER nil or omitted means use the current buffer."
|
||
(unless buffer
|
||
(setq buffer (current-buffer)))
|
||
(let ((overlays (overlays-in start end)))
|
||
(while overlays
|
||
(let ((overlay (car overlays)))
|
||
(when (overlay-get overlay 'put-image)
|
||
(delete-overlay overlay)))
|
||
(setq overlays (cdr overlays)))))
|
||
|
||
(defun image-search-load-path (file &optional path)
|
||
(unless path
|
||
(setq path image-load-path))
|
||
(let (element found filename)
|
||
(while (and (not found) (consp path))
|
||
(setq element (car path))
|
||
(cond
|
||
((stringp element)
|
||
(setq found
|
||
(file-readable-p
|
||
(setq filename (expand-file-name file element)))))
|
||
((and (symbolp element) (boundp element))
|
||
(setq element (symbol-value element))
|
||
(cond
|
||
((stringp element)
|
||
(setq found
|
||
(file-readable-p
|
||
(setq filename (expand-file-name file element)))))
|
||
((consp element)
|
||
(if (setq filename (image-search-load-path file element))
|
||
(setq found t))))))
|
||
(setq path (cdr path)))
|
||
(if found filename)))
|
||
|
||
;;;###autoload
|
||
(defun find-image (specs)
|
||
"Find an image, choosing one of a list of image specifications.
|
||
|
||
SPECS is a list of image specifications.
|
||
|
||
Each image specification in SPECS is a property list. The contents of
|
||
a specification are image type dependent. All specifications must at
|
||
least contain the properties `:type TYPE' and either `:file FILE' or
|
||
`:data DATA', where TYPE is a symbol specifying the image type,
|
||
e.g. `xbm', FILE is the file to load the image from, and DATA is a
|
||
string containing the actual image data. The specification whose TYPE
|
||
is supported, and FILE exists, is used to construct the image
|
||
specification to be returned. Return nil if no specification is
|
||
satisfied.
|
||
|
||
The image is looked for in `image-load-path'.
|
||
|
||
Image files should not be larger than specified by `max-image-size'."
|
||
(let (image)
|
||
(while (and specs (null image))
|
||
(let* ((spec (car specs))
|
||
(type (plist-get spec :type))
|
||
(data (plist-get spec :data))
|
||
(file (plist-get spec :file))
|
||
found)
|
||
(when (image-type-available-p type)
|
||
(cond ((stringp file)
|
||
(if (setq found (image-search-load-path file))
|
||
(setq image
|
||
(cons 'image (plist-put (copy-sequence spec)
|
||
:file found)))))
|
||
((not (null data))
|
||
(setq image (cons 'image spec)))))
|
||
(setq specs (cdr specs))))
|
||
image))
|
||
|
||
|
||
;;;###autoload
|
||
(defmacro defimage (symbol specs &optional doc)
|
||
"Define SYMBOL as an image.
|
||
|
||
SPECS is a list of image specifications. DOC is an optional
|
||
documentation string.
|
||
|
||
Each image specification in SPECS is a property list. The contents of
|
||
a specification are image type dependent. All specifications must at
|
||
least contain the properties `:type TYPE' and either `:file FILE' or
|
||
`:data DATA', where TYPE is a symbol specifying the image type,
|
||
e.g. `xbm', FILE is the file to load the image from, and DATA is a
|
||
string containing the actual image data. The first image
|
||
specification whose TYPE is supported, and FILE exists, is used to
|
||
define SYMBOL.
|
||
|
||
Example:
|
||
|
||
(defimage test-image ((:type xpm :file \"~/test1.xpm\")
|
||
(:type xbm :file \"~/test1.xbm\")))"
|
||
(declare (doc-string 3))
|
||
`(defvar ,symbol (find-image ',specs) ,doc))
|
||
|
||
|
||
;;; Animated image API
|
||
|
||
(defcustom image-animate-max-time 30
|
||
"Time in seconds to animate images."
|
||
:type 'integer
|
||
:version "24.1"
|
||
:group 'image)
|
||
|
||
(defconst image-animated-types '(gif)
|
||
"List of supported animated image types.")
|
||
|
||
;;;###autoload
|
||
(defun create-animated-image (file-or-data &optional type data-p &rest props)
|
||
"Create an animated image.
|
||
FILE-OR-DATA is an image file name or image data.
|
||
Optional TYPE is a symbol describing the image type. If TYPE is omitted
|
||
or nil, try to determine the image type from its first few bytes
|
||
of image data. If that doesn't work, and FILE-OR-DATA is a file name,
|
||
use its file extension as image type.
|
||
Optional DATA-P non-nil means FILE-OR-DATA is a string containing image data.
|
||
Optional PROPS are additional image attributes to assign to the image,
|
||
like, e.g. `:mask MASK'.
|
||
Value is the image created, or nil if images of type TYPE are not supported.
|
||
|
||
Images should not be larger than specified by `max-image-size'."
|
||
(setq type (image-type file-or-data type data-p))
|
||
(when (image-type-available-p type)
|
||
(let* ((animate (memq type image-animated-types))
|
||
(image
|
||
(append (list 'image :type type (if data-p :data :file) file-or-data)
|
||
(if animate '(:index 0))
|
||
props)))
|
||
(if animate
|
||
(image-animate-start image))
|
||
image)))
|
||
|
||
(defun image-animate-timer (image)
|
||
"Return the animation timer for image IMAGE."
|
||
;; See cancel-function-timers
|
||
(let ((tail timer-list) timer)
|
||
(while tail
|
||
(setq timer (car tail)
|
||
tail (cdr tail))
|
||
(if (and (eq (aref timer 5) #'image-animate-timeout)
|
||
(consp (aref timer 6))
|
||
(eq (car (aref timer 6)) image))
|
||
(setq tail nil)
|
||
(setq timer nil)))
|
||
timer))
|
||
|
||
(defun image-animate-start (image &optional max-time)
|
||
"Start animation of image IMAGE.
|
||
Optional second arg MAX-TIME is number of seconds to animate image,
|
||
or t to animate infinitely."
|
||
(let ((anim (image-animated-p image))
|
||
timer tmo)
|
||
(when anim
|
||
(if (setq timer (image-animate-timer image))
|
||
(setcar (nthcdr 3 (aref timer 6)) max-time)
|
||
(setq tmo (* (cdr anim) 0.01))
|
||
(setq max-time (or max-time image-animate-max-time))
|
||
(run-with-timer tmo nil #'image-animate-timeout
|
||
image 1 (car anim)
|
||
(if (numberp max-time)
|
||
(- max-time tmo)
|
||
max-time))))))
|
||
|
||
(defun image-animate-stop (image)
|
||
"Stop animation of image."
|
||
(let ((timer (image-animate-timer image)))
|
||
(when timer
|
||
(cancel-timer timer))))
|
||
|
||
(defun image-animate-timeout (image ino count time-left)
|
||
(if (>= ino count)
|
||
(setq ino 0))
|
||
(plist-put (cdr image) :index ino)
|
||
(force-window-update)
|
||
(let ((anim (image-animated-p image)) tmo)
|
||
(when anim
|
||
(setq tmo (* (cdr anim) 0.01))
|
||
(unless (and (= ino 0) (numberp time-left) (< time-left tmo))
|
||
(run-with-timer tmo nil #'image-animate-timeout
|
||
image (1+ ino) count
|
||
(if (numberp time-left)
|
||
(- time-left tmo)
|
||
time-left))))))
|
||
|
||
(defun image-animated-p (image)
|
||
"Return non-nil if image is animated.
|
||
Actually, return value is a cons (IMAGES . DELAY) where IMAGES
|
||
is the number of sub-images in the animated image, and DELAY
|
||
is the delay in 100ths of a second until the next sub-image
|
||
shall be displayed."
|
||
(cond
|
||
((eq (plist-get (cdr image) :type) 'gif)
|
||
(let* ((metadata (image-metadata image))
|
||
(images (plist-get metadata 'count))
|
||
(extdata (plist-get metadata 'extension-data))
|
||
(anim (plist-get extdata #xF9))
|
||
(tmo (and (integerp images) (> images 1)
|
||
(stringp anim) (>= (length anim) 4)
|
||
(+ (aref anim 1) (* (aref anim 2) 256)))))
|
||
(when tmo
|
||
(if (eq tmo 0) (setq tmo 10))
|
||
(cons images tmo))))))
|
||
|
||
|
||
(defcustom imagemagick-types-inhibit
|
||
'(C HTML HTM TXT PDF)
|
||
;; FIXME what are the possible options?
|
||
;; Are these actually file-name extensions?
|
||
;; Why are these upper-case when eg image-types is lower-case?
|
||
"Types the ImageMagick loader should not try to handle."
|
||
:type '(choice (const :tag "Let ImageMagick handle all the types it can" nil)
|
||
(repeat symbol))
|
||
:version "24.1"
|
||
:group 'image)
|
||
|
||
;;;###autoload
|
||
(defun imagemagick-register-types ()
|
||
"Register the file types that ImageMagick is able to handle."
|
||
(let ((im-types (imagemagick-types)))
|
||
(dolist (im-inhibit imagemagick-types-inhibit)
|
||
(setq im-types (remove im-inhibit im-types)))
|
||
(dolist (im-type im-types)
|
||
(let ((extension (downcase (symbol-name im-type))))
|
||
(push
|
||
(cons (concat "\\." extension "\\'") 'image-mode)
|
||
auto-mode-alist)
|
||
(push
|
||
(cons (concat "\\." extension "\\'") 'imagemagick)
|
||
image-type-file-name-regexps)))))
|
||
|
||
(provide 'image)
|
||
|
||
;;; image.el ends here
|