RE: Glyph Bitmap Caching in FreeType

[Feinberg, Matthew]

What I meant is (I guess I wasn't clear)... if FreeType 2 can render
strings of text, where it does it get the bitmaps for the glyphs used in
those strings?  Does it call other FreeType functions directly, or is
there a hook so that an application can provide a caching mechanism, but
still use FreeType 2 to render entire strings?

--Matthew

-----Original Message-----
From: Stefan Seefeld [mailto:address@hidden
Sent: Wednesday, March 08, 2000 8:53 AM
To: FreeType Development (E-mail)
Subject: Re: Glyph Bitmap Caching in FreeType


I don't think that mandatory caching inside FT is a good thing.
Different renderers have different pixmap formats or even vector
drawing formats (openGL display lists) so I'd prefer to do the
caching there. Each glyph is then produced once and only if the
renderer glyph lookup didn't find a glyph (whether individual
character or whole string) the freetype engine needs to be consulted.
Of course, 'equality' as used in the lookup can involve other
information as for example pixel relative position, since it
might require a glyph to be rasterized differently (hinting)
if the pixel relative position is not exactly the same or it
is rotated, or...

Regards,        Stefan
_______________________________________________________              
              
Stefan Seefeld
Departement de Physique
Universite de Montreal
email: address@hidden

_______________________________________________________

      ...ich hab' noch einen Koffer in Berlin...