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Fix size calculation for sliced images in image-mode (Bug#6639).

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* lisp/image-mode.el (image-display-size): New function.
(image-forward-hscroll, image-next-line, image-eol, image-eob)
(image-mode-fit-frame): Use it (Bug#6639).
This commit is contained in:
Shyam Karanatt 2010-07-17 17:51:04 -04:00 committed by Chong Yidong
parent dad7c7162b
commit c9088194ea
2 changed files with 34 additions and 6 deletions
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6
lisp/ChangeLog
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@ -1,3 +1,9 @@
2010-07-17 Shyam Karanatt <shyam@swathanthran.in> (tiny change)
* image-mode.el (image-display-size): New function.
(image-forward-hscroll, image-next-line, image-eol, image-eob)
(image-mode-fit-frame): Use it (Bug#6639).
2010-07-17 Chong Yidong <cyd@stupidchicken.com>
* dired.el (dired-buffers-for-dir): Handle list values of

34
lisp/image-mode.el
View File

@ -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)))