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 SourceGutterRendererText.

this	a SourceGutterRendererText.
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`.