This is a scale factor between
points specified in a PangoFontDescription and Cairo units. The
default value is 96, meaning that a 10 point font will be 13
units high. (10 * 96. / 72. = 13.3).
the resolution in "dots per inch". (Physical inches aren't actually
involved; the terminology is conventional.) A 0 or negative value
means to use the resolution from the font map.
Sets the resolution for the context.
This is a scale factor between points specified in a PangoFontDescription and Cairo units. The default value is 96, meaning that a 10 point font will be 13 units high. (10 * 96. / 72. = 13.3).