mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-12 09:28:24 +00:00
829 lines
30 KiB
EmacsLisp
829 lines
30 KiB
EmacsLisp
;;; image.el --- image API
|
||
|
||
;; Copyright (C) 1998-2012 Free Software Foundation, Inc.
|
||
|
||
;; Maintainer: FSF
|
||
;; Keywords: multimedia
|
||
;; Package: emacs
|
||
|
||
;; This file is part of GNU Emacs.
|
||
|
||
;; GNU Emacs is free software: you can redistribute it and/or modify
|
||
;; it under the terms of the GNU General Public License as published by
|
||
;; the Free Software Foundation, either version 3 of the License, or
|
||
;; (at your option) any later version.
|
||
|
||
;; GNU Emacs is distributed in the hope that it will be useful,
|
||
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;; GNU General Public License for more details.
|
||
|
||
;; You should have received a copy of the GNU General Public License
|
||
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
;;; Commentary:
|
||
|
||
;;; Code:
|
||
|
||
|
||
(defgroup image ()
|
||
"Image support."
|
||
:group 'multimedia)
|
||
|
||
(defalias 'image-refresh 'image-flush)
|
||
|
||
(defconst image-type-header-regexps
|
||
`(("\\`/[\t\n\r ]*\\*.*XPM.\\*/" . xpm)
|
||
("\\`P[1-6][[:space:]]+\\(?:#.*[[:space:]]+\\)*[0-9]+[[:space:]]+[0-9]+" . pbm)
|
||
("\\`GIF8[79]a" . gif)
|
||
("\\`\x89PNG\r\n\x1a\n" . png)
|
||
("\\`[\t\n\r ]*#define \\([a-z0-9_]+\\)_width [0-9]+\n\
|
||
#define \\1_height [0-9]+\n\\(\
|
||
#define \\1_x_hot [0-9]+\n\
|
||
#define \\1_y_hot [0-9]+\n\\)?\
|
||
static \\(unsigned \\)?char \\1_bits" . xbm)
|
||
("\\`\\(?:MM\0\\*\\|II\\*\0\\)" . tiff)
|
||
("\\`[\t\n\r ]*%!PS" . postscript)
|
||
("\\`\xff\xd8" . jpeg) ; used to be (image-jpeg-p . jpeg)
|
||
(,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
|
||
(comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
|
||
(concat "\\(?:<\\?xml[ \t\r\n]+[^>]*>\\)?[ \t\r\n]*<"
|
||
comment-re "*"
|
||
"\\(?:!DOCTYPE[ \t\r\n]+[^>]*>[ \t\r\n]*<[ \t\r\n]*" comment-re "*\\)?"
|
||
"[Ss][Vv][Gg]"))
|
||
. svg)
|
||
)
|
||
"Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
|
||
When the first bytes of an image file match REGEXP, it is assumed to
|
||
be of image type IMAGE-TYPE if IMAGE-TYPE is a symbol. If not a symbol,
|
||
IMAGE-TYPE must be a pair (PREDICATE . TYPE). PREDICATE is called
|
||
with one argument, a string containing the image data. If PREDICATE returns
|
||
a non-nil value, TYPE is the image's type.")
|
||
|
||
(defvar image-type-file-name-regexps
|
||
'(("\\.png\\'" . png)
|
||
("\\.gif\\'" . gif)
|
||
("\\.jpe?g\\'" . jpeg)
|
||
("\\.bmp\\'" . bmp)
|
||
("\\.xpm\\'" . xpm)
|
||
("\\.pbm\\'" . pbm)
|
||
("\\.xbm\\'" . xbm)
|
||
("\\.ps\\'" . postscript)
|
||
("\\.tiff?\\'" . tiff)
|
||
("\\.svgz?\\'" . svg)
|
||
)
|
||
"Alist of (REGEXP . IMAGE-TYPE) pairs used to identify image files.
|
||
When the name of an image file match REGEXP, it is assumed to
|
||
be of image type IMAGE-TYPE.")
|
||
|
||
;; We rely on `auto-mode-alist' to detect xbm and xpm files, instead
|
||
;; of content autodetection. Their contents are just C code, so it is
|
||
;; easy to generate false matches.
|
||
(defvar image-type-auto-detectable
|
||
'((pbm . t)
|
||
(xbm . nil)
|
||
(bmp . maybe)
|
||
(gif . maybe)
|
||
(png . maybe)
|
||
(xpm . nil)
|
||
(jpeg . maybe)
|
||
(tiff . maybe)
|
||
(svg . maybe)
|
||
(postscript . nil))
|
||
"Alist of (IMAGE-TYPE . AUTODETECT) pairs used to auto-detect image files.
|
||
\(See `image-type-auto-detected-p').
|
||
|
||
AUTODETECT can be
|
||
- t always auto-detect.
|
||
- nil never auto-detect.
|
||
- maybe auto-detect only if the image type is available
|
||
(see `image-type-available-p').")
|
||
|
||
(defcustom image-load-path
|
||
(list (file-name-as-directory (expand-file-name "images" data-directory))
|
||
'data-directory 'load-path)
|
||
"List of locations in which to search for image files.
|
||
If an element is a string, it defines a directory to search.
|
||
If an element is a variable symbol whose value is a string, that
|
||
value defines a directory to search.
|
||
If an element is a variable symbol whose value is a list, the
|
||
value is used as a list of directories to search."
|
||
:type '(repeat (choice directory variable))
|
||
:initialize 'custom-initialize-delay)
|
||
|
||
|
||
(defun image-load-path-for-library (library image &optional path no-error)
|
||
"Return a suitable search path for images used by LIBRARY.
|
||
|
||
It searches for IMAGE in `image-load-path' (excluding
|
||
\"`data-directory'/images\") and `load-path', followed by a path
|
||
suitable for LIBRARY, which includes \"../../etc/images\" and
|
||
\"../etc/images\" relative to the library file itself, and then
|
||
in \"`data-directory'/images\".
|
||
|
||
Then this function returns a list of directories which contains
|
||
first the directory in which IMAGE was found, followed by the
|
||
value of `load-path'. If PATH is given, it is used instead of
|
||
`load-path'.
|
||
|
||
If NO-ERROR is non-nil and a suitable path can't be found, don't
|
||
signal an error. Instead, return a list of directories as before,
|
||
except that nil appears in place of the image directory.
|
||
|
||
Here is an example that uses a common idiom to provide
|
||
compatibility with versions of Emacs that lack the variable
|
||
`image-load-path':
|
||
|
||
;; Shush compiler.
|
||
(defvar image-load-path)
|
||
|
||
(let* ((load-path (image-load-path-for-library \"mh-e\" \"mh-logo.xpm\"))
|
||
(image-load-path (cons (car load-path)
|
||
(when (boundp 'image-load-path)
|
||
image-load-path))))
|
||
(mh-tool-bar-folder-buttons-init))"
|
||
(unless library (error "No library specified"))
|
||
(unless image (error "No image specified"))
|
||
(let (image-directory image-directory-load-path)
|
||
;; Check for images in image-load-path or load-path.
|
||
(let ((img image)
|
||
(dir (or
|
||
;; Images in image-load-path.
|
||
(image-search-load-path image)
|
||
;; Images in load-path.
|
||
(locate-library image)))
|
||
parent)
|
||
;; Since the image might be in a nested directory (for
|
||
;; example, mail/attach.pbm), adjust `image-directory'
|
||
;; accordingly.
|
||
(when dir
|
||
(setq dir (file-name-directory dir))
|
||
(while (setq parent (file-name-directory img))
|
||
(setq img (directory-file-name parent)
|
||
dir (expand-file-name "../" dir))))
|
||
(setq image-directory-load-path dir))
|
||
|
||
;; If `image-directory-load-path' isn't Emacs's image directory,
|
||
;; it's probably a user preference, so use it. Then use a
|
||
;; relative setting if possible; otherwise, use
|
||
;; `image-directory-load-path'.
|
||
(cond
|
||
;; User-modified image-load-path?
|
||
((and image-directory-load-path
|
||
(not (equal image-directory-load-path
|
||
(file-name-as-directory
|
||
(expand-file-name "images" data-directory)))))
|
||
(setq image-directory image-directory-load-path))
|
||
;; Try relative setting.
|
||
((let (library-name d1ei d2ei)
|
||
;; First, find library in the load-path.
|
||
(setq library-name (locate-library library))
|
||
(if (not library-name)
|
||
(error "Cannot find library %s in load-path" library))
|
||
;; And then set image-directory relative to that.
|
||
(setq
|
||
;; Go down 2 levels.
|
||
d2ei (file-name-as-directory
|
||
(expand-file-name
|
||
(concat (file-name-directory library-name) "../../etc/images")))
|
||
;; Go down 1 level.
|
||
d1ei (file-name-as-directory
|
||
(expand-file-name
|
||
(concat (file-name-directory library-name) "../etc/images"))))
|
||
(setq image-directory
|
||
;; Set it to nil if image is not found.
|
||
(cond ((file-exists-p (expand-file-name image d2ei)) d2ei)
|
||
((file-exists-p (expand-file-name image d1ei)) d1ei)))))
|
||
;; Use Emacs's image directory.
|
||
(image-directory-load-path
|
||
(setq image-directory image-directory-load-path))
|
||
(no-error
|
||
(message "Could not find image %s for library %s" image library))
|
||
(t
|
||
(error "Could not find image %s for library %s" image library)))
|
||
|
||
;; Return an augmented `path' or `load-path'.
|
||
(nconc (list image-directory)
|
||
(delete image-directory (copy-sequence (or path load-path))))))
|
||
|
||
|
||
;; Used to be in image-type-header-regexps, but now not used anywhere
|
||
;; (since 2009-08-28).
|
||
(defun image-jpeg-p (data)
|
||
"Value is non-nil if DATA, a string, consists of JFIF image data.
|
||
We accept the tag Exif because that is the same format."
|
||
(setq data (ignore-errors (string-to-unibyte data)))
|
||
(when (and data (string-match-p "\\`\xff\xd8" data))
|
||
(catch 'jfif
|
||
(let ((len (length data)) (i 2))
|
||
(while (< i len)
|
||
(when (/= (aref data i) #xff)
|
||
(throw 'jfif nil))
|
||
(setq i (1+ i))
|
||
(when (>= (+ i 2) len)
|
||
(throw 'jfif nil))
|
||
(let ((nbytes (+ (lsh (aref data (+ i 1)) 8)
|
||
(aref data (+ i 2))))
|
||
(code (aref data i)))
|
||
(when (and (>= code #xe0) (<= code #xef))
|
||
;; APP0 LEN1 LEN2 "JFIF\0"
|
||
(throw 'jfif
|
||
(string-match-p "JFIF\\|Exif"
|
||
(substring data i (min (+ i nbytes) len)))))
|
||
(setq i (+ i 1 nbytes))))))))
|
||
|
||
|
||
;;;###autoload
|
||
(defun image-type-from-data (data)
|
||
"Determine the image type from image data DATA.
|
||
Value is a symbol specifying the image type or nil if type cannot
|
||
be determined."
|
||
(let ((types image-type-header-regexps)
|
||
type)
|
||
(while types
|
||
(let ((regexp (car (car types)))
|
||
(image-type (cdr (car types))))
|
||
(if (or (and (symbolp image-type)
|
||
(string-match-p regexp data))
|
||
(and (consp image-type)
|
||
(funcall (car image-type) data)
|
||
(setq image-type (cdr image-type))))
|
||
(setq type image-type
|
||
types nil)
|
||
(setq types (cdr types)))))
|
||
type))
|
||
|
||
|
||
;;;###autoload
|
||
(defun image-type-from-buffer ()
|
||
"Determine the image type from data in the current buffer.
|
||
Value is a symbol specifying the image type or nil if type cannot
|
||
be determined."
|
||
(let ((types image-type-header-regexps)
|
||
type
|
||
(opoint (point)))
|
||
(goto-char (point-min))
|
||
(while types
|
||
(let ((regexp (car (car types)))
|
||
(image-type (cdr (car types)))
|
||
data)
|
||
(if (or (and (symbolp image-type)
|
||
(looking-at-p regexp))
|
||
(and (consp image-type)
|
||
(funcall (car image-type)
|
||
(or data
|
||
(setq data
|
||
(buffer-substring
|
||
(point-min)
|
||
(min (point-max)
|
||
(+ (point-min) 256))))))
|
||
(setq image-type (cdr image-type))))
|
||
(setq type image-type
|
||
types nil)
|
||
(setq types (cdr types)))))
|
||
(goto-char opoint)
|
||
(and type
|
||
(memq type image-types)
|
||
type)))
|
||
|
||
|
||
;;;###autoload
|
||
(defun image-type-from-file-header (file)
|
||
"Determine the type of image file FILE from its first few bytes.
|
||
Value is a symbol specifying the image type, or nil if type cannot
|
||
be determined."
|
||
(unless (or (file-readable-p file)
|
||
(file-name-absolute-p file))
|
||
(setq file (image-search-load-path file)))
|
||
(and file
|
||
(file-readable-p file)
|
||
(with-temp-buffer
|
||
(set-buffer-multibyte nil)
|
||
(insert-file-contents-literally file nil 0 256)
|
||
(image-type-from-buffer))))
|
||
|
||
|
||
;;;###autoload
|
||
(defun image-type-from-file-name (file)
|
||
"Determine the type of image file FILE from its name.
|
||
Value is a symbol specifying the image type, or nil if type cannot
|
||
be determined."
|
||
(let (type first)
|
||
(catch 'found
|
||
(dolist (elem image-type-file-name-regexps first)
|
||
(when (string-match-p (car elem) file)
|
||
(if (image-type-available-p (setq type (cdr elem)))
|
||
(throw 'found type)
|
||
;; If nothing seems to be supported, return first type that matched.
|
||
(or first (setq first type))))))))
|
||
|
||
;;;###autoload
|
||
(defun image-type (source &optional type data-p)
|
||
"Determine and return image type.
|
||
SOURCE 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 SOURCE is a file name,
|
||
use its file extension as image type.
|
||
Optional DATA-P non-nil means SOURCE is a string containing image data."
|
||
(when (and (not data-p) (not (stringp source)))
|
||
(error "Invalid image file name `%s'" source))
|
||
(unless type
|
||
(setq type (if data-p
|
||
(image-type-from-data source)
|
||
(or (image-type-from-file-header source)
|
||
(image-type-from-file-name source))))
|
||
(or type (error "Cannot determine image type")))
|
||
(or (memq type (and (boundp 'image-types) image-types))
|
||
(error "Invalid image type `%s'" type))
|
||
type)
|
||
|
||
|
||
(if (fboundp 'image-metadata) ; eg not --without-x
|
||
(define-obsolete-function-alias 'image-extension-data
|
||
'image-metadata' "24.1"))
|
||
|
||
(define-obsolete-variable-alias
|
||
'image-library-alist
|
||
'dynamic-library-alist "24.1")
|
||
|
||
;;;###autoload
|
||
(defun image-type-available-p (type)
|
||
"Return non-nil if image type TYPE is available.
|
||
Image types are symbols like `xbm' or `jpeg'."
|
||
(and (fboundp 'init-image-library)
|
||
(init-image-library type)))
|
||
|
||
|
||
;;;###autoload
|
||
(defun image-type-auto-detected-p ()
|
||
"Return t if the current buffer contains an auto-detectable image.
|
||
This function is intended to be used from `magic-fallback-mode-alist'.
|
||
|
||
The buffer is considered to contain an auto-detectable image if
|
||
its beginning matches an image type in `image-type-header-regexps',
|
||
and that image type is present in `image-type-auto-detectable' with a
|
||
non-nil value. If that value is non-nil, but not t, then the image type
|
||
must be available."
|
||
(let* ((type (image-type-from-buffer))
|
||
(auto (and type (cdr (assq type image-type-auto-detectable)))))
|
||
(and auto
|
||
(or (eq auto t) (image-type-available-p type)))))
|
||
|
||
|
||
;;;###autoload
|
||
(defun create-image (file-or-data &optional type data-p &rest props)
|
||
"Create an 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'.
|
||
|
||
Image file names that are not absolute are searched for in the
|
||
\"images\" sub-directory of `data-directory' and
|
||
`x-bitmap-file-path' (in that order)."
|
||
;; It is x_find_image_file in image.c that sets the search path.
|
||
(setq type (image-type file-or-data type data-p))
|
||
(when (image-type-available-p type)
|
||
(append (list 'image :type type (if data-p :data :file) file-or-data)
|
||
props)))
|
||
|
||
|
||
;;;###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)))
|
||
|
||
|
||
;;;###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)))))
|
||
|
||
|
||
;;;###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)))
|
||
(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
|
||
|
||
(defconst image-animated-types '(gif)
|
||
"List of supported animated image types.")
|
||
|
||
(defun image-animated-p (image)
|
||
"Return non-nil if IMAGE can be animated.
|
||
To be capable of being animated, an image must be of a type
|
||
listed in `image-animated-types', and contain more than one
|
||
sub-image, with a specified animation delay. The actual return
|
||
value is a cons (NIMAGES . DELAY), where NIMAGES is the number
|
||
of sub-images in the animated image and DELAY is the delay in
|
||
seconds until the next sub-image should be displayed."
|
||
(cond
|
||
((memq (plist-get (cdr image) :type) image-animated-types)
|
||
(let* ((metadata (image-metadata image))
|
||
(images (plist-get metadata 'count))
|
||
(delay (plist-get metadata 'delay)))
|
||
(when (and images (> images 1) (numberp delay))
|
||
(if (< delay 0) (setq delay 0.1))
|
||
(cons images delay))))))
|
||
|
||
;; "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-animated-p image))
|
||
timer)
|
||
(when animation
|
||
(if (setq timer (image-animate-timer image))
|
||
(cancel-timer timer))
|
||
(run-with-timer 0.2 nil 'image-animate-timeout
|
||
image (or index 0) (car animation)
|
||
0 limit))))
|
||
|
||
(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))
|
||
|
||
;; FIXME? The delay may not be the same for different sub-images,
|
||
;; hence we need to call image-animated-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)
|
||
"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 0.01s."
|
||
(plist-put (cdr image) :index n)
|
||
(force-window-update)
|
||
(setq n (1+ n))
|
||
(let* ((time (float-time))
|
||
(animation (image-animated-p image))
|
||
;; Subtract off the time we took to load the image from the
|
||
;; stated delay time.
|
||
(delay (max (+ (cdr animation) time (- (float-time)))
|
||
0.01))
|
||
done)
|
||
(if (>= n count)
|
||
(if limit
|
||
(setq 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))))
|
||
|
||
|
||
(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"
|
||
:group 'image)
|
||
|
||
(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"
|
||
:group 'image)
|
||
|
||
(imagemagick-register-types)
|
||
|
||
(provide 'image)
|
||
|
||
;;; image.el ends here
|