cairoSetFontSize
Sets the current font matrix to a scale by a factor of size, replacing
any font matrix previously set with cairoSetFontSize or
cairoSetFontMatrix. This results in a font size of size user space
units. (More precisely, this matrix will result in the font's
em-square being a size by size square in user space.)
cairoSetFontSize(cr, size)
If text is drawn without a call to cairoSetFontSize, (nor
cairoSetFontMatrix nor cairoSetScaledFont), the default
font size is 10.0.
Derived by RGtkGen from GTK+ documentation
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