True Type Instructions

Sebastián Sastre ssastre at
Sun May 28 21:52:58 UTC 2006


	there is any chance to run it in windows? What should be done for

	best regards,


> -----Mensaje original-----
> De: squeak-dev-bounces at 
> [mailto:squeak-dev-bounces at] En 
> nombre de Boris Gaertner
> Enviado el: Martes, 16 de Mayo de 2006 16:40
> Para: Noname Myname; The general-purpose Squeak developers list
> Asunto: Re: True Type Instructions 
> "Noname Myname" <gcdart_squeak at> wrote:
> > One more Question , shud the true type instructions in the 
> Open Type 
> > files definitely be executed ?
> > Or are they supported currently in SQUEAK ?
> > Well if they are ... then wud'nt
> > the display of characters be terribly slow ?
> Squeak does not execute glyph instructions (hints).
> Most TTF fonts can be used without hinting. The well-known 
> exception is MingLiU, a font for chinese. The glyphs of that 
> font are defined as glyph instructions that assemble 
> collections of strokes into hanzi ideographs. To render such 
> these glyphs, you have to execute the glyph instructions. But 
> I think MingLiU is a rare exception in the universe of True 
> Type Fonts.
> > Becuz you have to create an intrepreter inside another
> > interpreter("SQUEAK")
> > to understand the instructions and execute them.
> I think it would be doable to write an interpreter for glyph 
> instructions, but it would be difficult - if not impossible - 
> to incorporate it into an open software project like Squeak.
> You have to bear in mind that some aspects of glyph hinting 
> are protected by patents (hold by Apple). It is therefore not 
> possible to freely distribute a complete implementation of 
> glyph hinting. There is a well-known work-around: FreeType.
> The late Henrik Gedenryd has done some impressive work in 
> this direction, but at this moment I feel unable to explain 
> you details about that admireable work.
> > how does SQUEAK Handle the text display so efficiently or 
> am i missing 
> > something very basic .... ?
> Keep in mind that you do not have to render a glyph every 
> time you display it. You do it once for a selected fontsize 
> and you render only needed glyphs. Once a glyph is rendered, 
> it will be cached in the font instance. This is implemented 
> in TTCFont.
> Glyph rendering itself  is implemented in
> TTGlyph>>asFormWithScale:ascender:descender:fgColor:bgColor:depth:
> Hope this helps.

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