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Re: [ft] Vertical layout

From: Chia I Wu
Subject: Re: [ft] Vertical layout
Date: Thu, 13 Oct 2005 07:39:56 +0800
User-agent: Mutt/1.5.11

On Wed, Oct 12, 2005 at 03:59:18PM -0700, Sergey Tolstov wrote:
> Hello,
> In what state is FT support for vertical glyph metrics?
The problem you encountered has been fixed in CVS:
> I am encountering problem with vertical glyph metrics, when they are
> present in a font file. I get a huge number for the linearVertAdvance,
> other values look fine, because of that, glyphs are not generated. I
> need advance value in design units for WYSIWYG.
> While debugging, I found:
> In the ttgload.c, line 1768, subtraction is incorrect
>       advance_height = (FT_UShort)( loader->pp4.y - loader->pp3.y );
> should be, according to earlier calculations
>       advance_height = (FT_UShort)( loader->pp3.y - loader->pp4.y );
> Even with that fix, linearVertAdvance is calculated incorrectly. (Should
> they use loader->vadvance instead?)
As loader->pp's are in 26.6, advance_height should be divided by y_scale
after the calculation.


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