measure_markup

Description:

public void measure_markup (string markup, out int width, out int height)

Measures the pango markup provided using the pango layout used by the GutterRendererText.

this	a GutterRendererText.
markup	the pango markup to measure.
width	location to store the width of the text in pixels, or null.
height	location to store the height of the text in pixels, or null.