doc-view-scale-adjust
doc-view-scale-adjust is an interactive compiled Lisp function in `doc-view.el
'.
(doc-view-scale-adjust FACTOR)
Adjust the scale of the DocView page images by FACTOR.
FACTOR defaults to `doc-view-shrink-factor'.
The actual adjustment made depends on the final component of the
key-binding used to invoke the command, with all modifiers removed:
+, = Increase the image scale by FACTOR
- Decrease the image scale by FACTOR
0 Reset the image scale to the initial scale