> I am drawing multi line text using FreeType2. Now,I compare my text
> position with Adobe AfterEffects built-in text. I found that using
> standard fonts like Verdana the auto spacing looks good. But with
> some less standard fonts like Segoe UI the second line text has a
> shift of several pixels on vertical axis.
Auto spacing? What do you mean?
> I set the line spacing using Font metrics Height property.
What formula?
> Interesting also is that if I manually set the line spacing using
> this formula:
>
> pen.y -= verticalSpacingInPixels /
> ( fontSizeInPixels / FontMetrics->UnitsPerEM )
>
> then both in AfterEffects and in my app the spacing looks the same.
Then simply use this formula!
> What can it be? May be Adobe AfterEffects calculates auto spacing
> in some unique way? But then why does it show the same results as
> in my app for standard fonts?
I'm not sure I understand. However, there are programs like TeX that
derive the baseline-to-baseline spacing directly from a font's point
size, completely ignoring any vertical dimensions stored in a fontc.
Maybe AfterEffects is using a similar strategy.
Werner
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