Glimmr Canvas-Based Drawing
version 2/101030 by Erik Temple
Chapter - Image-rendered string class
An image-rendered string is a kind of rendered string.
The specification of image-rendered string is "An image-rendered string is a rendered string in which each glyph is drawn using a separate external PNG file; these are assigned and managed via a separate font object, which must be supplied as the 'associated font' of the rendered string. Like sprites, the rendered string can be provided its own 'scaling factor' property to adjust the size of its glyphs relative to the canvas. If the 'background tint' property is supplied (a glulx color value), a rectangle of that color will be drawn behind the rendered string."
[The scaling factor is automatically calculated by the extension; authors need not utilize it.]
An image-rendered string has a real number called the calculated scaling factor.