double get_intrinsic_aspect_ratio ( GdkPaintable* paintable )
Gets the preferred aspect ratio the
paintable would like to be displayed at.
The aspect ratio is the width divided by the height, so a value of 0.5
means that the
paintable prefers to be displayed twice as high as it
is wide. Consumers of this interface can use this to preserve aspect
ratio when displaying the paintable.
This is a purely informational value and does not in any way limit the
values that may be passed to
Usually when a
paintable returns nonzero values from
gdk_paintable_get_intrinsic_height() the aspect ratio
should conform to those values, though that is not required.
paintable does not have a preferred aspect ratio,
it returns 0. Negative values are never returned.