Mentor

Slava Pestov

Level

Intermediate

Skills required

• Knowledge of Unicode
• Knowledge of the Win32 API
• Knowledge of Factor's UI toolkit

Technical outline

Factor has Uniscribe bindings in basis/windows/. This needs to be hooked up with the ui.text API, namely the following operations need to be implemented:

• rendering a piece of text to a DC
• getting text width, height, baseline, cap height and x-height (last two optional)
• getting font ascent, descent, cap height, x-height (all optional but nice)
• convert x offset to code point number and vice versa

The following vocabularies are useful to look at:

• core-text
• core-text.fonts
• ui.text
• ui.text.core-text

Helpful links

• http://www.microsoft.com/typography/developers/uniscribe/uniscribe.htm
• http://msdn.microsoft.com/en-us/library/ms776483(VS.85).aspx
• http://factor-language.blogspot.com/2009/03/rendering-unicode-text-with-pango-and.html
• http://factor-language.blogspot.com/2009/02/metric-bounds-versus-image-bounds.html
• http://factor-language.blogspot.com/2009/02/font-metrics-and-baseline-alignment.html
• http://factor-language.blogspot.com/2009/01/rendering-unicode-text-to-opengl.html