True Type Instructions
ssastre at seaswork.com.ar
Sun May 28 21:52:58 UTC 2006
there is any chance to run it in windows? What should be done for
> -----Mensaje original-----
> De: squeak-dev-bounces at lists.squeakfoundation.org
> [mailto:squeak-dev-bounces at lists.squeakfoundation.org] 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 rediffmail.com> 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
> Hope this helps.
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