[Emacs-diffs] emacs-25 e0dd65c: Document how to check for ImageMagick support

[Eli Zaretskii]

branch: emacs-25
commit e0dd65cd444fd9e5ee6b5921936c6c829df75e50
Author: Lars Ingebrigtsen <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Document how to check for ImageMagick support
    
    * doc/lispref/display.texi (ImageMagick Images): Say how to
    check for ImageMagick support, which isn't quite obvious
    (bug#20702).
    
    This is backport from master
    (cherry picked from commit faf07d646575c78d6d956ce91820ebbf38308553)
---
 doc/lispref/display.texi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index d3e4248..68b48e0 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -5157,6 +5157,12 @@ Conveniences,,, emacs, The GNU Emacs Manual}).  The 
image type symbol
 for images loaded via ImageMagick is @code{imagemagick}, regardless of
 the actual underlying image format.
 
+To check for ImageMagick support, use the following:
+
address@hidden
+(image-type-available-p 'imagemagick)
address@hidden lisp
+
 @defun imagemagick-types
 This function returns a list of image file extensions supported by the
 current ImageMagick installation.  Each list element is a symbol