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Re: [ft] Problem of oblique using FT_Outline_Transform
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From: |
Werner LEMBERG |
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Subject: |
Re: [ft] Problem of oblique using FT_Outline_Transform |
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Date: |
Wed, 20 Jun 2012 06:56:24 +0200 (CEST) |
> Indeed the bearing is incorrect.
>
> I've compared my machine's arial.ttf with ariali.ttf, the result is
> ariali.ttf has a "v" that has 3 more pixels of left bearing than
> arial.ttf ( both at pt size 42, dpi 78 ). It could be due to
> ariali.ttf is a manually corrected "true italic" font.
I don't mean that. Look at this unslanted ASCII graphic:
+--------------+--------------+--------------+
| +--------+ |\ /|+------------+|
| / \ | \ / || ||
|/ \| \ / || ||
|| || \ / |+------------+|
|\ /| \ / || |
| \ / | \ / || |
| +--------+ | \/ |+------------+|
+--------------+--------------+--------------+
This is correctly slanted:
+--------------+--------------+--------------+
/ +-------+ /| //+------------+/
/ / | / | / // //
/ / |/ | / // //
// // | / /+------------+/
/ | / / | / // /
/ | / / | / // /
/ +------+ / |/ /+------------+/
+--------------+--------------+--------------+
And this is what obviously you are doing:
+---------------++-------------+--------------------+
| +-------+|| /| +------------+|
| / ||| / | / / |
| / ||| / | / / |
|/ / || / | +------------+ |
|| / || / | / |
|| / || / | / |
|+------+ ||/ |+------------+ |
+---------------+--------------+--------------------+
Even thes poor ASCII graphics immediately show that your code must be
flawed: In your image, the `v' is too far to the left, and the `e' is
too far to the right.
Werner