diff options
Diffstat (limited to 'lisp/image-mode.el')
| -rw-r--r-- | lisp/image-mode.el | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/lisp/image-mode.el b/lisp/image-mode.el index e202aca63b0..a34989171bb 100644 --- a/lisp/image-mode.el +++ b/lisp/image-mode.el @@ -128,6 +128,28 @@ A winprops object has the shape (WINDOW . ALIST)." (declare-function image-size "image.c" (spec &optional pixels frame)) +(defun image-display-size (spec &optional pixels frame) + "Wrapper around `image-size', to handle slice display properties. +If SPEC is an image display property, call `image-size' with the +given arguments. +If SPEC is a list of properties containing `image' and `slice' +properties, calculate the display size from the slice property. +If SPEC contains `image' but not `slice', call `image-size' with +the specified image." + (if (eq (car spec) 'image) + (image-size spec pixels frame) + (let ((image (assoc 'image spec)) + (slice (assoc 'slice spec))) + (cond ((and image slice) + (if pixels + (cons (nth 3 slice) (nth 4 slice)) + (cons (/ (float (nth 3 slice)) (frame-char-width frame)) + (/ (float (nth 4 slice)) (frame-char-height frame))))) + (image + (image-size image pixels frame)) + (t + (error "Invalid image specification: %s" spec)))))) + (defun image-forward-hscroll (&optional n) "Scroll image in current window to the left by N character widths. Stop if the right edge of the image is reached." @@ -139,7 +161,7 @@ Stop if the right edge of the image is reached." (let* ((image (image-get-display-property)) (edges (window-inside-edges)) (win-width (- (nth 2 edges) (nth 0 edges))) - (img-width (ceiling (car (image-size image))))) + (img-width (ceiling (car (image-display-size image))))) (image-set-window-hscroll (min (max 0 (- img-width win-width)) (+ n (window-hscroll)))))))) @@ -160,7 +182,7 @@ Stop if the bottom edge of the image is reached." (let* ((image (image-get-display-property)) (edges (window-inside-edges)) (win-height (- (nth 3 edges) (nth 1 edges))) - (img-height (ceiling (cdr (image-size image))))) + (img-height (ceiling (cdr (image-display-size image))))) (image-set-window-vscroll (min (max 0 (- img-height win-height)) (+ n (window-vscroll)))))))) @@ -233,7 +255,7 @@ stopping if the top or bottom edge of the image is reached." (let* ((image (image-get-display-property)) (edges (window-inside-edges)) (win-width (- (nth 2 edges) (nth 0 edges))) - (img-width (ceiling (car (image-size image))))) + (img-width (ceiling (car (image-display-size image))))) (image-set-window-hscroll (max 0 (- img-width win-width))))) (defun image-bob () @@ -248,9 +270,9 @@ stopping if the top or bottom edge of the image is reached." (let* ((image (image-get-display-property)) (edges (window-inside-edges)) (win-width (- (nth 2 edges) (nth 0 edges))) - (img-width (ceiling (car (image-size image)))) + (img-width (ceiling (car (image-display-size image)))) (win-height (- (nth 3 edges) (nth 1 edges))) - (img-height (ceiling (cdr (image-size image))))) + (img-height (ceiling (cdr (image-display-size image))))) (image-set-window-hscroll (max 0 (- img-width win-width))) (image-set-window-vscroll (max 0 (- img-height win-height))))) @@ -264,7 +286,7 @@ This function assumes the current frame has only one window." (interactive) (let* ((saved (frame-parameter nil 'image-mode-saved-size)) (display (image-get-display-property)) - (size (image-size display))) + (size (image-display-size display))) (if (and saved (eq (caar saved) (frame-width)) (eq (cdar saved) (frame-height))) |