[ft-devel] Fw: [Devel] Re: FreeType performance issue

[Werner LEMBERG]

David,


have you ever seen this message (and my response)?


    Werner
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> Subject: 
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> [Devel] Re: FreeType performance issue
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> Date: 
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> Tue, 28 Dec 2004 08:27:45 +0100 (CET)
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> > [...]
> >
> > In 'ftgrays.c ' file, the 'gray_convert_glyph' function calls
> > 'gray_compute_cbox' function first to get an glyph boundary.
> >
> > *gray_compute_cbox function costs O(n) - n is the number of points
> >
> > But in this time, I think FreeType can use (raster->target).width,
> > (raster->target).height.  I think the code can be changed like this
> >
> >     /*gray_compute_cbox( RAS_VAR );*/                // Don't need
> >     raster->min_ex = 0;                              // Added
> >     raster->max_ex = (raster->target).width;         // Added
> >     raster->min_ey = 0;                              // Added
> >     raster->max_ey = (raster->target).height;        // Added
> >     ...
> >
> > Would you tell me if there is any reason that I can't do like this?
>
> I'm not an expert in optimizing C code for speed, but your change
> looks promising.  After the 2.1.10 release (which should happen soon)
> I invite you to contribute changes which makes FreeType faster --
> please provide a patch produced with the `diff' program, using the
> `-u' switch, together with a ChangeLog entry.
>
> Thanks in advance.
>
>
>     Werner
>
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