Re: [ft] How to render glyphs with baseline offset

[pvh1987]

Thanks for your response.

That Harfbuzz library sounds interesting. I will look into that. The lack of
documentation might not be a problem if the library is easy to use :-) I
will give it a try.


Werner LEMBERG wrote:
> 
> 
>> However, I find the library totally NOT intuitive, since I am a C++
>> developer and not very used to low level C libraries.
> 
> Suggestions for improvements of the documentation (or even patches)
> are highly welcomed!
> 
>> So, now, here is my main problem at the moment: When I set the pen
>> coordinates like this:
>>
>>   pen.x = posx*64;
>>   pen.y = (height-posy)*64;
>>
>> where (posx, posy) are the pixel coordinates on the wxDC and height
>> are the font size (in points!), the text is drawed so the leftmost
>> point on the baseline of the first glyph is at (posx, posy).
>> Instead, I would like it to draw the text so (posx, posy) is the
>> upper-left point of the bounding box of the font face.  And rotation
>> has to be around this point as well.  How can I do that?  I spent
>> hours, hours and hours to make some kind of offset to pen.y, but it
>> is never just right when taking different DPI's and rotation into
>> account.
> 
> The only solution is to get an exact bbox of a character string is to
> let FreeType compute all outlines at the given ppem value (this data
> should be cached).  I strongly recommend to use a higher-level library
> like Harfbuzz which does this job for you, and which also takes care
> of advanced typographical stuff.
> 
>> My second question is, to render single line, rotated "rich text",
>> that is text that is using different font faces (normal, italic),
>> different weight (regular, bold), underline, overline, subscript and
>> superscript, can I use FreeType to do this directly?  If not, I
>> guess it can do the job, but I will do better (and faster) with a
>> library that already supports this. So, what library is that?  It
>> has to be cross-platform (Windows, Mac OS X, Linux and so on) and of
>> course, well supported and easy to use.
> 
> Again: Harfbuzz.  You will be certainly delighted to hear that there
> is *no* documentation yet of this library :-) However, its demo and
> test programs are written in C++.
> 
> 
>     Werner
> 
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