Re: [ft-devel] 答复: performance on FreeTyp e actions

[David Turner]

Hello,

rperez a écrit :
> Hi There,
> I am trying to use the freetype caching to cache glyphs. It seems that I
> managed to do so with one (major) exception - I cant seems to succeed in
> advance the pen for each glyph.
> I am using the FreeType 2.1.4 and my code goes something like this:
>
> FTC_Image_Cache_Lookup(mFTImageCache, &imageDesc, glyph.id, &glyph.image);
> FT_Outline_Get_BBox(&((FT_OutlineGlyph) glyph.image)->outline,  &bounds);
> FT_Vector_Transform(&glyph.origin,&affine);
> FT_Glyph_Transform(glyph.image,&affine,&glyph.origin);
> FT_Glyph_To_Bitmap(&glyph.image,ft_render_mode_normal,(FT_Vector *)
> NULL,MagickFalse);
> bitmap=(FT_BitmapGlyph) glyph.image;
>
> at that point the bitmap->left field should be updated to the right value
> but it is always 0.
>
> when I replace 
> FTC_Image_Cache_Lookup(mFTImageCache, &imageDesc, glyph.id, &glyph.image);
> with
> FT_Load_Glyph(face,glyph.id,FT_LOAD_NO_BITMAP);
> FT_Get_Glyph(face->glyph,&glyph.image);
>
> (not using cache) the bitmap->left field is updated correctly.
> any ideas?
>
>   
First of all, the cache API has changed a bit since 2.1.4, and I advise 
you to use the one currently
in CVS (soon to be 2.2) , since it's know officially sanctionned as 
"stable". This shouldn't be very
difficult.

Second, the glyph returned by FTC_Image_Cache_Lookup is owned by the 
cache sub-system,
and you're not allowed to modify it (e.g. by calling FT_Glyph_Transform) 
like you do.

Third, the glyph returned by FTC_Image_Cache_Lookup isn't necessarily an 
outline, it really
depends on the flags you've been using to load it.

Did you check the error codes returned by all functions, as well as the 
type of the FT_Glyph
you're manipulating ?

Regards,

- David Turner
- The FreeType Project  (www.freetype.org)


> Thanks,
> Ronen.
> --
> View this message in context: 
> http://www.nabble.com/performance-on-FreeType-actions-t1387531.html#a3837814
> Sent from the Freetype - Dev forum at Nabble.com.
>
>
>
> _______________________________________________
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> http://lists.nongnu.org/mailman/listinfo/freetype-devel
>
>   


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