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1042 lines
39 KiB
EmacsLisp
1042 lines
39 KiB
EmacsLisp
;;; image.el --- image API -*- lexical-binding:t -*-
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;; Copyright (C) 1998-2017 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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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]\\(?:\
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\\(?:\\(?:#[^\r\n]*[\r\n]\\)?[[:space:]]\\)+\
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\\(?:\\(?:#[^\r\n]*[\r\n]\\)?[0-9]\\)+\
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\\)\\{2\\}" . 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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(defvar 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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(defvar image-format-suffixes
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'((image/x-rgb "rgb") (image/x-icon "ico"))
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"An alist associating image types with file name suffixes.
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This is used as a hint by the ImageMagick library when detecting
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the type of image data (that does not have an associated file name).
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Each element has the form (MIME-CONTENT-TYPE EXTENSION).
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If `create-image' is called with a :format attribute whose value
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equals a content-type found in this list, the ImageMagick library is
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told that the data would have the associated suffix if saved to a file.")
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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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Subdirectories are not automatically included in the search."
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:type '(repeat (choice directory variable))
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:initialize #'custom-initialize-delay)
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(defcustom image-scaling-factor 'auto
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"When displaying images, apply this scaling factor before displaying.
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This is not supported for all image types, and is mostly useful
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when you have a high-resolution monitor.
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The value is either a floating point number (where numbers higher
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than 1 means to increase the size and lower means to shrink the
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size), or the symbol `auto', which will compute a scaling factor
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based on the font pixel size."
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:type '(choice number
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(const :tag "Automatically compute" auto))
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:version "26.1")
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;; Map put into text properties on images.
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(defvar image-map
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(let ((map (make-sparse-keymap)))
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(define-key map "-" 'image-decrease-size)
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(define-key map "+" 'image-increase-size)
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(define-key map "r" 'image-rotate)
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(define-key map "o" 'image-save)
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map))
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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's 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's 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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;; Used to be in image-type-header-regexps, but now not used anywhere
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;; (since 2009-08-28).
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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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(and type
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(boundp 'image-types)
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(memq type image-types)
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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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(let (type first (case-fold-search t))
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(catch 'found
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(dolist (elem image-type-file-name-regexps first)
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(when (string-match-p (car elem) file)
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(if (image-type-available-p (setq type (cdr elem)))
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(throw 'found type)
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;; If nothing seems to be supported, return first type that matched.
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(or first (setq first type))))))))
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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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(if (fboundp 'image-metadata) ; eg not --without-x
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(define-obsolete-function-alias 'image-extension-data
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'image-metadata "24.1"))
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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)))
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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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(and (not (plist-get props :scale))
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(list :scale
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(image-compute-scaling-factor image-scaling-factor)))
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props)))
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(defun image--set-property (image property value)
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"Set PROPERTY in IMAGE to VALUE.
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Internal use only."
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(if (null value)
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(while (cdr image)
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;; IMAGE starts with the symbol `image', and the rest is a
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;; plist. Decouple plist entries where the key matches
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;; the property.
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(if (eq (cadr image) property)
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(setcdr image (cddr image))
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(setq image (cddr image))))
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;; Just enter the new value.
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(plist-put (cdr image) property value))
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value)
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(defun image-property (image property)
|
||
"Return the value of PROPERTY in IMAGE.
|
||
Properties can be set with
|
||
|
||
(setf (image-property IMAGE PROPERTY) VALUE)
|
||
If VALUE is nil, PROPERTY is removed from IMAGE."
|
||
(declare (gv-setter image--set-property))
|
||
(plist-get (cdr image) property))
|
||
|
||
(defun image-compute-scaling-factor (scaling)
|
||
(cond
|
||
((numberp scaling) scaling)
|
||
((eq scaling 'auto)
|
||
(let ((width (/ (float (window-width nil t)) (window-width))))
|
||
;; If we assume that a typical character is 10 pixels in width,
|
||
;; then we should scale all images according to how wide they
|
||
;; are. But don't scale images down.
|
||
(if (< width 10)
|
||
1
|
||
(/ (float width) 10))))
|
||
(t
|
||
(error "Invalid scaling factor %s" scaling))))
|
||
|
||
;;;###autoload
|
||
(defun put-image (image pos &optional string area)
|
||
"Put image IMAGE in front of POS in the current buffer.
|
||
IMAGE must be an image created with `create-image' or `defimage'.
|
||
IMAGE is displayed by putting an overlay into the current buffer with a
|
||
`before-string' STRING that has a `display' property whose value is the
|
||
image. STRING is defaulted if you omit it.
|
||
The overlay created will have the `put-image' property set to t.
|
||
POS may be an integer or marker.
|
||
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."
|
||
(unless string (setq string "x"))
|
||
(let ((buffer (current-buffer)))
|
||
(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))
|
||
(setq string (copy-sequence string))
|
||
(let ((overlay (make-overlay pos pos buffer))
|
||
(prop (if (null area) image (list (list 'margin area) image))))
|
||
(put-text-property 0 (length string) 'display prop string)
|
||
(overlay-put overlay 'put-image t)
|
||
(overlay-put overlay 'before-string string)
|
||
(overlay-put overlay 'map image-map)
|
||
overlay)))
|
||
|
||
|
||
;;;###autoload
|
||
(defun insert-image (image &optional string area slice)
|
||
"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
|
||
defaults to a single space 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.
|
||
SLICE specifies slice of IMAGE to insert. SLICE nil or omitted
|
||
means insert whole image. SLICE is a list (X Y WIDTH HEIGHT)
|
||
specifying the X and Y positions and WIDTH and HEIGHT of image area
|
||
to insert. A float value 0.0 - 1.0 means relative to the width or
|
||
height of the image; integer values are taken as pixel values."
|
||
;; Use a space as least likely to cause trouble when it's a hidden
|
||
;; character in the buffer.
|
||
(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 ((start (point)))
|
||
(insert string)
|
||
(add-text-properties start (point)
|
||
`(display ,(if slice
|
||
(list (cons 'slice slice) image)
|
||
image)
|
||
rear-nonsticky (display)
|
||
keymap ,image-map))))
|
||
|
||
|
||
;;;###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. The default
|
||
STRING is a single space.
|
||
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)
|
||
keymap ,image-map))
|
||
(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, and return SYMBOL.
|
||
|
||
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
|
||
|
||
(defvar image-default-frame-delay 0.1
|
||
"Default interval in seconds between frames of a multi-frame image.
|
||
Only used if the image does not specify a value.")
|
||
|
||
(defun image-multi-frame-p (image)
|
||
"Return non-nil if IMAGE contains more than one frame.
|
||
The actual return value is a cons (NIMAGES . DELAY), where NIMAGES is
|
||
the number of frames (or sub-images) in the image and DELAY is the delay
|
||
in seconds that the image specifies between each frame. DELAY may be nil,
|
||
in which case you might want to use `image-default-frame-delay'."
|
||
(when (fboundp 'image-metadata)
|
||
(let* ((metadata (image-metadata image))
|
||
(images (plist-get metadata 'count))
|
||
(delay (plist-get metadata 'delay)))
|
||
(when (and images (> images 1))
|
||
(and delay (or (not (numberp delay)) (< delay 0))
|
||
(setq delay image-default-frame-delay))
|
||
(cons images delay)))))
|
||
|
||
(defun image-animated-p (image)
|
||
"Like `image-multi-frame-p', but returns nil if no delay is specified."
|
||
(let ((multi (image-multi-frame-p image)))
|
||
(and (cdr multi) multi)))
|
||
|
||
(make-obsolete 'image-animated-p 'image-multi-frame-p "24.4")
|
||
|
||
;; "Destructively"?
|
||
(defun image-animate (image &optional index limit)
|
||
"Start animating IMAGE.
|
||
Animation occurs by destructively altering the IMAGE spec list.
|
||
|
||
With optional INDEX, begin animating from that animation frame.
|
||
LIMIT specifies how long to animate the image. If omitted or
|
||
nil, play the animation until the end. If t, loop forever. If a
|
||
number, play until that number of seconds has elapsed."
|
||
(let ((animation (image-multi-frame-p image))
|
||
timer)
|
||
(when animation
|
||
(if (setq timer (image-animate-timer image))
|
||
(cancel-timer timer))
|
||
(plist-put (cdr image) :animate-buffer (current-buffer))
|
||
(run-with-timer 0.2 nil #'image-animate-timeout
|
||
image (or index 0) (car animation)
|
||
0 limit (+ (float-time) 0.2)))))
|
||
|
||
(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 (timer--function timer) #'image-animate-timeout)
|
||
(eq (car-safe (timer--args timer)) image))
|
||
(setq tail nil)
|
||
(setq timer nil)))
|
||
timer))
|
||
|
||
(defconst image-minimum-frame-delay 0.01
|
||
"Minimum interval in seconds between frames of an animated image.")
|
||
|
||
(defun image-current-frame (image)
|
||
"The current frame number of IMAGE, indexed from 0."
|
||
(or (plist-get (cdr image) :index) 0))
|
||
|
||
(defun image-show-frame (image n &optional nocheck)
|
||
"Show frame N of IMAGE.
|
||
Frames are indexed from 0. Optional argument NOCHECK non-nil means
|
||
do not check N is within the range of frames present in the image."
|
||
(unless nocheck
|
||
(if (< n 0) (setq n 0)
|
||
(setq n (min n (1- (car (image-multi-frame-p image)))))))
|
||
(plist-put (cdr image) :index n)
|
||
(force-window-update))
|
||
|
||
(defun image-animate-get-speed (image)
|
||
"Return the speed factor for animating IMAGE."
|
||
(or (plist-get (cdr image) :speed) 1))
|
||
|
||
(defun image-animate-set-speed (image value &optional multiply)
|
||
"Set the speed factor for animating IMAGE to VALUE.
|
||
With optional argument MULTIPLY non-nil, treat VALUE as a
|
||
multiplication factor for the current value."
|
||
(plist-put (cdr image) :speed
|
||
(if multiply
|
||
(* value (image-animate-get-speed image))
|
||
value)))
|
||
|
||
;; FIXME? The delay may not be the same for different sub-images,
|
||
;; hence we need to call image-multi-frame-p to return it.
|
||
;; But it also returns count, so why do we bother passing that as an
|
||
;; argument?
|
||
(defun image-animate-timeout (image n count time-elapsed limit target-time)
|
||
"Display animation frame N of IMAGE.
|
||
N=0 refers to the initial animation frame.
|
||
COUNT is the total number of frames in the animation.
|
||
TIME-ELAPSED is the total time that has elapsed since
|
||
`image-animate-start' was called.
|
||
LIMIT determines when to stop. If t, loop forever. If nil, stop
|
||
after displaying the last animation frame. Otherwise, stop
|
||
after LIMIT seconds have elapsed.
|
||
The minimum delay between successive frames is `image-minimum-frame-delay'.
|
||
|
||
If the image has a non-nil :speed property, it acts as a multiplier
|
||
for the animation speed. A negative value means to animate in reverse."
|
||
(when (and (buffer-live-p (plist-get (cdr image) :animate-buffer))
|
||
;; Delayed more than two seconds more than expected.
|
||
(or (<= (- (float-time) target-time) 2)
|
||
(progn
|
||
(message "Stopping animation; animation possibly too big")
|
||
nil)))
|
||
(image-show-frame image n t)
|
||
(let* ((speed (image-animate-get-speed image))
|
||
(time (float-time))
|
||
(animation (image-multi-frame-p image))
|
||
;; Subtract off the time we took to load the image from the
|
||
;; stated delay time.
|
||
(delay (max (+ (* (or (cdr animation) image-default-frame-delay)
|
||
(/ 1.0 (abs speed)))
|
||
time (- (float-time)))
|
||
image-minimum-frame-delay))
|
||
done)
|
||
(setq n (if (< speed 0)
|
||
(1- n)
|
||
(1+ n)))
|
||
(if limit
|
||
(cond ((>= n count) (setq n 0))
|
||
((< n 0) (setq n (1- count))))
|
||
(and (or (>= n count) (< n 0)) (setq done t)))
|
||
(setq time-elapsed (+ delay time-elapsed))
|
||
(if (numberp limit)
|
||
(setq done (>= time-elapsed limit)))
|
||
(unless done
|
||
(run-with-timer delay nil #'image-animate-timeout
|
||
image n count time-elapsed limit
|
||
(+ (float-time) delay))))))
|
||
|
||
|
||
(defvar imagemagick-types-inhibit)
|
||
(defvar imagemagick-enabled-types)
|
||
|
||
(defun imagemagick-filter-types ()
|
||
"Return a list of the ImageMagick types to be treated as images, or nil.
|
||
This is the result of `imagemagick-types', including only elements
|
||
that match `imagemagick-enabled-types' and do not match
|
||
`imagemagick-types-inhibit'."
|
||
(when (fboundp 'imagemagick-types)
|
||
(cond ((null imagemagick-enabled-types) nil)
|
||
((eq imagemagick-types-inhibit t) nil)
|
||
(t
|
||
(delq nil
|
||
(mapcar
|
||
(lambda (type)
|
||
(unless (memq type imagemagick-types-inhibit)
|
||
(if (eq imagemagick-enabled-types t) type
|
||
(catch 'found
|
||
(dolist (enable imagemagick-enabled-types nil)
|
||
(if (cond ((symbolp enable) (eq enable type))
|
||
((stringp enable)
|
||
(string-match enable
|
||
(symbol-name type))))
|
||
(throw 'found type)))))))
|
||
(imagemagick-types)))))))
|
||
|
||
(defvar imagemagick--file-regexp nil
|
||
"File extension regexp for ImageMagick files, if any.
|
||
This is the extension installed into `auto-mode-alist' and
|
||
`image-type-file-name-regexps' by `imagemagick-register-types'.")
|
||
|
||
;;;###autoload
|
||
(defun imagemagick-register-types ()
|
||
"Register file types that can be handled by ImageMagick.
|
||
This function is called at startup, after loading the init file.
|
||
It registers the ImageMagick types returned by `imagemagick-filter-types'.
|
||
|
||
Registered image types are added to `auto-mode-alist', so that
|
||
Emacs visits them in Image mode. They are also added to
|
||
`image-type-file-name-regexps', so that the `image-type' function
|
||
recognizes these files as having image type `imagemagick'.
|
||
|
||
If Emacs is compiled without ImageMagick support, this does nothing."
|
||
(when (fboundp 'imagemagick-types)
|
||
(let* ((types (mapcar (lambda (type) (downcase (symbol-name type)))
|
||
(imagemagick-filter-types)))
|
||
(re (if types (concat "\\." (regexp-opt types) "\\'")))
|
||
(ama-elt (car (member (cons imagemagick--file-regexp 'image-mode)
|
||
auto-mode-alist)))
|
||
(itfnr-elt (car (member (cons imagemagick--file-regexp 'imagemagick)
|
||
image-type-file-name-regexps))))
|
||
(if (not re)
|
||
(setq auto-mode-alist (delete ama-elt auto-mode-alist)
|
||
image-type-file-name-regexps
|
||
(delete itfnr-elt image-type-file-name-regexps))
|
||
(if ama-elt
|
||
(setcar ama-elt re)
|
||
(push (cons re 'image-mode) auto-mode-alist))
|
||
(if itfnr-elt
|
||
(setcar itfnr-elt re)
|
||
;; Append to `image-type-file-name-regexps', so that we
|
||
;; preferentially use specialized image libraries.
|
||
(add-to-list 'image-type-file-name-regexps
|
||
(cons re 'imagemagick) t)))
|
||
(setq imagemagick--file-regexp re))))
|
||
|
||
(defcustom imagemagick-types-inhibit
|
||
'(C HTML HTM INFO M TXT PDF)
|
||
"List of ImageMagick types that should never be treated as images.
|
||
This should be a list of symbols, each of which should be one of
|
||
the ImageMagick types listed by `imagemagick-types'. The listed
|
||
image types are not registered by `imagemagick-register-types'.
|
||
|
||
If the value is t, inhibit the use of ImageMagick for images.
|
||
|
||
If you change this without using customize, you must call
|
||
`imagemagick-register-types' afterwards.
|
||
|
||
If Emacs is compiled without ImageMagick support, this variable
|
||
has no effect."
|
||
:type '(choice (const :tag "Support all ImageMagick types" nil)
|
||
(const :tag "Disable all ImageMagick types" t)
|
||
(repeat symbol))
|
||
:initialize #'custom-initialize-default
|
||
:set (lambda (symbol value)
|
||
(set-default symbol value)
|
||
(imagemagick-register-types))
|
||
:version "24.3")
|
||
|
||
(defcustom imagemagick-enabled-types
|
||
'(3FR ART ARW AVS BMP BMP2 BMP3 CAL CALS CMYK CMYKA CR2 CRW
|
||
CUR CUT DCM DCR DCX DDS DJVU DNG DPX EXR FAX FITS GBR GIF
|
||
GIF87 GRB HRZ ICB ICO ICON J2C JNG JP2 JPC JPEG JPG JPX K25
|
||
KDC MIFF MNG MRW MSL MSVG MTV NEF ORF OTB PBM PCD PCDS PCL
|
||
PCT PCX PDB PEF PGM PICT PIX PJPEG PNG PNG24 PNG32 PNG8 PNM
|
||
PPM PSD PTIF PWP RAF RAS RBG RGB RGBA RGBO RLA RLE SCR SCT
|
||
SFW SGI SR2 SRF SUN SVG SVGZ TGA TIFF TIFF64 TILE TIM TTF
|
||
UYVY VDA VICAR VID VIFF VST WBMP WPG X3F XBM XC XCF XPM XV
|
||
XWD YCbCr YCbCrA YUV)
|
||
"List of ImageMagick types to treat as images.
|
||
Each list element should be a string or symbol, representing one
|
||
of the image types returned by `imagemagick-types'. If the
|
||
element is a string, it is handled as a regexp that enables all
|
||
matching types.
|
||
|
||
The value of `imagemagick-enabled-types' may also be t, meaning
|
||
to enable all types that ImageMagick supports.
|
||
|
||
The variable `imagemagick-types-inhibit' overrides this variable.
|
||
|
||
If you change this without using customize, you must call
|
||
`imagemagick-register-types' afterwards.
|
||
|
||
If Emacs is compiled without ImageMagick support, this variable
|
||
has no effect."
|
||
:type '(choice (const :tag "Support all ImageMagick types" t)
|
||
(const :tag "Disable all ImageMagick types" nil)
|
||
(repeat :tag "List of types"
|
||
(choice (symbol :tag "type")
|
||
(regexp :tag "regexp"))))
|
||
:initialize #'custom-initialize-default
|
||
:set (lambda (symbol value)
|
||
(set-default symbol value)
|
||
(imagemagick-register-types))
|
||
:version "24.3")
|
||
|
||
(imagemagick-register-types)
|
||
|
||
(defun image-increase-size (n)
|
||
"Increase the image size by a factor of N.
|
||
If N is 3, then the image size will be increased by 30%. The
|
||
default is 20%."
|
||
(interactive "P")
|
||
(image--change-size (if n
|
||
(1+ (/ n 10.0))
|
||
1.2)))
|
||
|
||
(defun image-decrease-size (n)
|
||
"Decrease the image size by a factor of N.
|
||
If N is 3, then the image size will be decreased by 30%. The
|
||
default is 20%."
|
||
(interactive "P")
|
||
(image--change-size (if n
|
||
(- 1 (/ n 10.0))
|
||
0.8)))
|
||
|
||
(defun image--get-image ()
|
||
(let ((image (get-text-property (point) 'display)))
|
||
(unless (eq (car-safe image) 'image)
|
||
(error "No image under point"))
|
||
image))
|
||
|
||
(defun image--get-imagemagick-and-warn ()
|
||
(unless (fboundp 'imagemagick-types)
|
||
(error "Can't rescale images without ImageMagick support"))
|
||
(let ((image (image--get-image)))
|
||
(image-flush image)
|
||
(plist-put (cdr image) :type 'imagemagick)
|
||
image))
|
||
|
||
(defun image--change-size (factor)
|
||
(let* ((image (image--get-imagemagick-and-warn))
|
||
(new-image (image--image-without-parameters image))
|
||
(scale (image--current-scaling image new-image)))
|
||
(setcdr image (cdr new-image))
|
||
(plist-put (cdr image) :scale (* scale factor))))
|
||
|
||
(defun image--image-without-parameters (image)
|
||
(cons (pop image)
|
||
(let ((new nil))
|
||
(while image
|
||
(let ((key (pop image))
|
||
(val (pop image)))
|
||
(unless (memq key '(:scale :width :height :max-width :max-height))
|
||
(setq new (nconc new (list key val))))))
|
||
new)))
|
||
|
||
(defun image--current-scaling (image new-image)
|
||
;; The image may be scaled due to many reasons (:scale, :max-width,
|
||
;; etc), so find out what the current scaling is based on the
|
||
;; original image size and the displayed size.
|
||
(let ((image-width (car (image-size new-image t)))
|
||
(display-width (car (image-size image t))))
|
||
(/ (float display-width) image-width)))
|
||
|
||
(defun image-rotate ()
|
||
"Rotate the image under point by 90 degrees clockwise."
|
||
(interactive)
|
||
(let ((image (image--get-imagemagick-and-warn)))
|
||
(plist-put (cdr image) :rotation
|
||
(float (mod (+ (or (plist-get (cdr image) :rotation) 0) 90)
|
||
;; We don't want to exceed 360 degrees
|
||
;; rotation, because it's not seen as valid
|
||
;; in exif data.
|
||
360)))))
|
||
|
||
(defun image-save ()
|
||
"Save the image under point."
|
||
(interactive)
|
||
(let ((image (get-text-property (point) 'display)))
|
||
(when (or (not (consp image))
|
||
(not (eq (car image) 'image)))
|
||
(error "No image under point"))
|
||
(with-temp-buffer
|
||
(let ((file (plist-get (cdr image) :file)))
|
||
(if file
|
||
(if (not (file-exists-p file))
|
||
(error "File %s no longer exists" file)
|
||
(insert-file-contents-literally file))
|
||
(insert (plist-get (cdr image) :data))))
|
||
(write-region (point-min) (point-max)
|
||
(read-file-name "Write image to file: ")))))
|
||
|
||
(provide 'image)
|
||
|
||
;;; image.el ends here
|