Re: Question on bitmap fonts

FROM : Aki Inoue
DATE : Tue Apr 01 18:53:15 2008

From the look of it, I think there is floating-point rounding involved.

After all, the graphics system is treating it as a scalable font so 
the notion of bitmap (or pixel-based) font design doesn't apply.

Aki

On 2008/04/01, at 9:48, Tobia Conforto wrote:

> Thank you!
> I hadn't thought of using gdb :-)
>
> Now I only need to understand why y = -2.66400003 instead of 
> -2.66666651
>
>
> Tobia
>
>
> On 1 Apr 2008, at 18:36, Aki Inoue wrote:

>> This is the information returned from the font.
>>
>> (gdb) p glyphBBox
>> $30 = {
>> origin = {
>>  x = 0,
>>  y = -2.66400003
>> },
>> size = {
>>  width = 6,
>>  height = 12
>> }
>> }
>>
>> (gdb) p ascender
>> $31 = 9.33333302
>> (gdb) p descender
>> $32 = 2.66666651
>> (gdb) p 12 - 2.66400003
>> $33 = 9.3359999699999996
>>
>> The bounding box is for Capital Letter A with grave accent.  As you 
>> can see, it's too close and sticking out a little.
>>
>> Aki