RE: [ft-devel] FT_Outline_Get_Bitmap

[Turner, David]

As far as I know, all you need is set bitmap->pixel_mode to
FT_PIXEL_MODE_MONO before calling FT_Outline_Get_Bitmap.

the function will then choose the b&w renderer automatically.

- David


> -----Message d'origine-----
> De : address@hidden
> [mailto:address@hidden
> la part de
> George Williams
> Envoyé : mercredi 16 novembre 2005 23:09
> À : address@hidden
> Objet : [ft-devel] FT_Outline_Get_Bitmap
>
>
> Werner & I stumbled on a case where I'd like to get a black & white
> image out of FT_Outline_Get_Bitmap rather than the grey scale output
> that is currently returned.
>
> == Justification ==============================================
> When FF is in debug mode it displays a raster showing what
> pixels would
> be turned on with the current position of the splines. When doing AA
> debugging I can use FT_Outline_Get_Bitmap with the information in the
> execution context and get a grey scale image for the current outline.
> All is happy and nice.
>
> But when doing B&W debugging I ended up writing my own
> (simple) routine
> which turned a pixel on if the center of the pixel was within the
> outline. It didn't do dropout prevention.
>
> In 10pixel B&W debugging of "K" from Vera.ttf this routine gave
> different results from those from freetype. Which made Werner unhappy.
>
> So it might be nice to give consistent results to those from freetype.
> =================================================================
>
> Two thoughts enter my head:
>       Adding a b&w version of FT_OGB to the API
>       Changing the API so that FT_OGB looks at num_grays or
>               pixel_mode field of the bitmap argument.
>       (I think this is a bad idea, I merely suggest it because it was
>        what I tried)
>
> I'm not volunteering to write this myself at the moment. I'm sort of
> hoping someone can tell me that all I need to do is call
> FT_Outline_Get_Foobar.
>
>
>
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> http://lists.nongnu.org/mailman/listinfo/freetype-devel
>
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