Re: [ft-devel] character spacing

[Louis Desjardins]

Thank-you for your reply, actually I do save face->glyph->advance.x, and when it comes time to render this is what I am using. Unfortunately the spacing does not look right still. 

> Date: Mon, 19 Sep 2011 09:20:46 -0400
> From: address@hidden
> To: address@hidden
> CC: address@hidden; address@hidden
> Subject: Re: [ft-devel] character spacing
>
> On 09/19/11 01:21, Louis Desjardins wrote:
> > Also - as I have already invested much time in Freetype I no longer have time
> > to integrate a different library such as Pango - is there somewhere I can
> > obtain freely distributable TTF files that contains kerning information that
> > can be handled by Freetype?
>
> I'm guessing that you don't want kerning. You want the glyph advance widths.
> I'm just guessing that you are stacking bitmaps next to eachother, using the
> bitmap width as the "advance" vector. That's wrong. When saving the bitmaps,
> also save face->glyph->advance.x.
>
> behdad
>
>
> > Thank-you!
> >
> > ------------------------------------------------------------------------------
> > From: address@hidden
> > To: address@hidden
> > CC: address@hidden
> > Subject: RE: [ft-devel] character spacing
> > Date: Sun, 18 Sep 2011 22:15:58 -0700
> >
> > Thanks for your reply -
> >
> >> Note, however, that today many fonts contain kerning in the GPOS table
> >> which is not handled by FreeType. Instead, you have to use a
> >> higher-level library like Pango or ICU.
> >
> > FT_HAS_KERNING will return true for these types of fonts? When I call,
> > FT_Get_Kerning, the akerning value always gets set to (0,0), which from the
> > sample code on freetype.org, looks like is an error. Could this indicate that
> > the kerning information is in the 'GPOS' table? How can I know for sure, or is
> > there a way to debug this?
> >
> > Thank-you again!
> >
> >
> >> Date: Mon, 19 Sep 2011 07:10:24 +0200
> >> To: address@hidden
> >> CC: address@hidden
> >> Subject: Re: [ft-devel] character spacing
> >> From: address@hidden
> >>
> >>
> >> > In order to draw my text, I currently make calls to:
> >> >
> >> > FT_Get_Char_Index
> >> > FT_Load_Glyph
> >> > FT_Render_Glyph
> >> >
> >> > and then I store the bitmap of each ascii character to memory, so
> >> > that once I actually render the character, I can simply call on the
> >> > stored bitmap.
> >> >
> >> > The problem is that the character spacing is not correct. It looks
> >> > like I need to use FT_Get_Kerning to correct this, however from the
> >> > examples I've seen, it looks like I need to call this before
> >> > FT_Load_Glyph, i.e. at the time when I am storing each of my
> >> > characters.
> >> >
> >> > However, I have no idea what strings will be rendered, until
> >> > runtime, so I don't know the 'left_glyph' and 'right_glyph'
> >> > parameters in FT_Get_Kerning beforehand. Is there a way to make use
> >> > of FT_Get_Kerning while drawing my bitmap (after I've already loaded
> >> > the glyph and retrieved its bitmap), in order to achieve proper
> >> > character spacing at runtime?
> >>
> >> Have a look at the ftstring demo program to see how simple kerning
> >> works. You can call `FT_Get_Kerning' whenever you want; it is
> >> completely unrelated to `FT_Render_Glyph'.
> >>
> >> Note, however, that today many fonts contain kerning in the GPOS table
> >> which is not handled by FreeType. Instead, you have to use a
> >> higher-level library like Pango or ICU.
> >>
> >>
> >> Werner
> >
> >
> >
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