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Document how :map and :scale interacts in image maps

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* doc/lispref/display.texi (Image Descriptors): Mention problems
with scaling (bug#50487).
This commit is contained in:
Lars Ingebrigtsen 2022-08-25 16:38:14 +02:00
parent 514372722a
commit ec4f976e8e
1 changed files with 8 additions and 0 deletions
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doc/lispref/display.texi
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@ -5886,6 +5886,14 @@ When you click the mouse when the mouse pointer is over a hot-spot, an
event is composed by combining the @var{id} of the hot-spot with the
mouse event; for instance, @code{[area4 mouse-1]} if the hot-spot's
@var{id} is @code{area4}.
Note that the map's coordinates should reflect the displayed image
after all transforms have been done (rotation, scaling and so on), and
also note that Emacs (by default) performs auto-scaling of images, so
to make things match up, you should either specify @code{:scale 1.0}
when creating the image, or use the result of
@code{image-compute-scaling-factor} to compute the elements of the
map.
@end table
@defun image-mask-p spec &optional frame