[cairo] PDF: Font size is rounded

[Kouhei Sutou]

Hi,

In <56FF4093.5090907 at redneon.com>
  "Re: [cairo] PDF: Font size is rounded" on Sat, 2 Apr 2016 14:16:27 +1030,
  Adrian Johnson <ajohnson at redneon.com> wrote:

> I put some printfs in _cairo_ft_scaled_glyph_init (in cairo-ft-font.c).
> It appears that FreeType is returning hinted metrics. I'm guessing that
> to get unhinted metrics of TrueType fonts we need to set the scale to
> the EM size like we do for win32 fonts.
> 
> I'm attaching a patch to do this. It fixes your test case. I don't know
> if this patch is the correct way to fix the problem. I am not familiar
> with the FreeType font backend.

Thanks for the patch.
I've also confirmed that the patch fix this case.

With the patch:
  http://pub.cozmixng.org/~kou/tmp/truetype-size-with-cairo-patch.pdf
Without the patch:
  http://pub.cozmixng.org/~kou/tmp/truetype-size-without-cairo-patch.pdf

And explicit CAIRO_HINT_METRICS_OFF isn't needed.

Source:
  http://pub.cozmixng.org/~kou/tmp/truetype-size-without-explicit-hint-metrics-off.c


I hope that this patch is included into the next cairo release.


Thanks,
--
kou