Re: [ft] Freetype 2.4.4 -> freetype 2.4.12: FT_Get_Advance changed behaviour?

[Gregor Mückl]

Hi!

I've reduced my code to the attached program (which is still a bit 
convoluted - sorry!). It is a reduced version of my layouting algorithm. 
I've shortened it quite a bit, including removing most of the vertical 
layouting stuff, so there may be some odd things here and there that do 
not seem to make sense. The core is _TL_CalculateRunWidth, as in the 
fragment in the previous mail.

It should compile on Linux with gcc (or at least g++ if some C++ism 
stuck), but I have not yet found the time to test it on that platform. 
On Windows, it reproduces the bug. If you cannot compile the code or if 
you have problems recreating the issue, please let me know. Thanks!

For Cantarell Regular (also attached, part of the Google web fonts 
collection), the program output differs depending on the library version:

Freetype library version: 2.4.4
glyph 0: position (0.000000, 0.000000)
glyph 1: position (12.000000, 0.000000)
glyph 2: position (23.000000, 0.000000)
glyph 3: position (33.000000, 0.000000)

Freetype library version: 2.4.12
glyph 0: position (0.000000, 0.000000)
glyph 1: position (19.187500, 0.000000)
glyph 2: position (36.781250, 0.000000)
glyph 3: position (52.781250, 0.000000)


Regards,
Gregor

On 6/2/2013 9:31 PM, Werner LEMBERG wrote:
> > I've upgraded a project of mine from using freetype 2.4.4 to
> > freetype 2.4.12 and now I experience totally broken text layouting
> > (the layouting code is my own).  Horizontal spacings between
> > characters are now either far too large or far too small, depending
> > on the font.  In one case the glyph distances are at least double
> > what they should be.  None of the tested fonts give anything close
> > to believable reasults.  Linking against the old version of freetype
> > without any further code changes fixes this issue.  [...]
>
> Maybe a bug.  I can't see anything strange within your code.
>
> Can you provide a minimum stand-alone example written in C which
> exhibits the problem, and which I can compile and debug on my
> GNU/Linux box?  If necessary, please send the offending font privately
> to me.
>
>
>      Werner

Cantarell-Regular.ttf
Description: Binary data

textlayouttext.cpp
Description: Text document