emacs-27 1dff0a8: * lisp/image-mode.el (image-toggle-display-image): Fix fit of rotated images.

[Juri Linkov]

branch: emacs-27
commit 1dff0a89497fec15297a97fcd643ea8475f704da
Author: Juri Linkov <juri@linkov.net>
Commit: Juri Linkov <juri@linkov.net>

    * lisp/image-mode.el (image-toggle-display-image): Fix fit of rotated 
images.
    
    When fitting rotated image to width and height, swap width and height
    when changing orientation between portrait and landscape (bug#41886).
---
 lisp/image-mode.el | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/lisp/image-mode.el b/lisp/image-mode.el
index b82c066..1bb213c 100644
--- a/lisp/image-mode.el
+++ b/lisp/image-mode.el
@@ -810,8 +810,12 @@ was inserted."
            filename))
         ;; If we have a `fit-width' or a `fit-height', don't limit
         ;; the size of the image to the window size.
-        (edges (and (eq image-transform-resize t)
-                    (window-inside-pixel-edges (get-buffer-window))))
+        (edges (when (eq image-transform-resize t)
+                 (window-inside-pixel-edges (get-buffer-window))))
+        (max-width (when edges
+                     (- (nth 2 edges) (nth 0 edges))))
+        (max-height (when edges
+                      (- (nth 3 edges) (nth 1 edges))))
         (type (if (image--imagemagick-wanted-p filename)
                   'imagemagick
                 (image-type file-or-data nil data-p)))
@@ -827,14 +831,18 @@ was inserted."
                  (ignore-error exif-error
                    (exif-parse-buffer)))
                 0.0)))
+    ;; Swap width and height when changing orientation
+    ;; between portrait and landscape.
+    (when (and edges (zerop (mod (+ image-transform-rotation 90) 180)))
+      (setq max-width (prog1 max-height (setq max-height max-width))))
 
     ;; :scale 1: If we do not set this, create-image will apply
     ;; default scaling based on font size.
     (setq image (if (not edges)
                    (create-image file-or-data type data-p :scale 1)
                  (create-image file-or-data type data-p :scale 1
-                               :max-width (- (nth 2 edges) (nth 0 edges))
-                               :max-height (- (nth 3 edges) (nth 1 edges)))))
+                               :max-width max-width
+                               :max-height max-height)))
 
     ;; Discard any stale image data before looking it up again.
     (image-flush image)