[Bug 752147] glimagesink and textoverlay aren't friends on OS X

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752147

--- Comment #7 from Julien Isorce <julien.isorce at gmail.com> ---
Since pango provides 2 backend on osx (QUARTZ named coretext and FREETYPE named
fontconfig) we could use the later which seems to work:

"#if defined(__APPLE__) (and probably &&
!defined(GSTREAMER_GLIB_COCOA_NSAPPLICATION)) fontmap =
pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT)" instead of
"fontmap = pango_cairo_font_map_get_default ();" here
http://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/ext/pango/gstbasetextoverlay.c#n319

See https://github.com/GNOME/pango/blob/master/pango/pangocairo-fontmap.c#L132
and https://github.com/GNOME/pango/blob/master/pango/pangocairo-fontmap.c#L74


Quick test:

PANGOCAIRO_BACKEND=fontconfig gst-launch-1.0 videotestsrc ! textoverlay
text="hello" font-desc="Verdana bold 80px" ! glimagesink

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