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Re: [ft] putting text in a box
From: |
Werner LEMBERG |
Subject: |
Re: [ft] putting text in a box |
Date: |
Thu, 21 Jan 2010 00:58:58 +0100 (CET) |
>>> Do you know, though, of a way to get the descent value for an
>>> individual glyph reliably for any font?
>>
>> Normally, computing the cbox (or the bbox, to be absolutely sure
>> for the weird cases which shouldn't happen with well designed
>> fonts) should do the right thing.
>
> I guess this is what's confusing me. I looked at the tutorial code
> for getting the cbox, for example, and the result of the call is
> just that, a box. So that would be a box which completely enclosed
> the glyph right?
Yes.
> How does that yield the information I need, namely the distance
> below the baseline which the glyph extends?
As I told you earlier: A negative bbox value descends below the
baseline (which has y=0). I have no idea what's going on with GL.
There might be even a bug in FreeType, thus my request to test it with
native FreeType API calls.
A possible reason for GL to disallow negative bbox values is the
PostScript rendering model which by default cuts off all coordinates
with non-positive values (since they are drawn outside of the `drawing
paper' with its physical origin (0,0) at the lower left corner).
Werner
- [ft] putting text in a box, Dave Calkins, 2010/01/19
- Re: [ft] putting text in a box, Werner LEMBERG, 2010/01/19
- Re: [ft] putting text in a box, Dave Calkins, 2010/01/20
- Re: [ft] putting text in a box, Werner LEMBERG, 2010/01/20
- Re: [ft] putting text in a box, Dave Calkins, 2010/01/20
- Re: [ft] putting text in a box, Werner LEMBERG, 2010/01/20
- Re: [ft] putting text in a box, dave, 2010/01/20
- Re: [ft] putting text in a box,
Werner LEMBERG <=
- Re: [ft] putting text in a box, dave, 2010/01/20
- Re: [ft] putting text in a box, Werner LEMBERG, 2010/01/21
- RE: [ft] putting text in a box, David Bevan, 2010/01/21
- Re: [ft] putting text in a box, Werner LEMBERG, 2010/01/21
- RE: [ft] putting text in a box, David Bevan, 2010/01/21
- Message not available
- RE: [ft] putting text in a box, dave, 2010/01/21
- Re: [ft] putting text in a box, Werner LEMBERG, 2010/01/23
- Re: [ft] putting text in a box, dave, 2010/01/21
- Re: [ft] putting text in a box, Dave Calkins, 2010/01/21
- Re: [ft] putting text in a box, Dave Calkins, 2010/01/21