[HarfBuzz] rendering options for hb-view

[Jamie Dale]

I've just grabbed a version with the new flags API, but I'm finding that I
can't actually use hb_ft_font_get_load_flags and hb_ft_font_get_face in my
custom funcs, as they fail the font->destroy != (hb_destroy_func_t)
_hb_ft_font_destroy test since I'm using a sub-font with a different
destroy function.

Usually I'd work around this by adding my own functions to access those
flags from the private data, however hb_ft_font_t is defined in a source
file (rather than a private header), so I can't access it at all.

Is there another way I can solve this? Should I just set and get the flags
and face from the parent font instead?

For your reference, this is how I create my font:

hb_font_t* HarfBuzzFont = nullptr;

{
  // Create a sub-font from the default FreeType implementation so we can
override some font functions to provide low-level caching
  hb_font_t* HarfBuzzFTFont = hb_ft_font_create(FreeTypeFace, nullptr);
  HarfBuzzFont = hb_font_create_sub_font(HarfBuzzFTFont);
  hb_font_destroy(HarfBuzzFTFont);
}

hb_ft_font_set_load_flags(...);
hb_font_set_funcs(...);
hb_font_set_user_data(...);
hb_font_set_scale(...);

On 8 October 2015 at 16:41, Werner LEMBERG <wl at gnu.org> wrote:

>
> > Ok, so I've patched hb-ft to allow setting load_flags.  Here's a
> > branch:
> >
> >
> https://github.com/behdad/harfbuzz/commit/ce981bdc6f58f390af4bee575500ffc45a877ab6
>
> Thanks!  Do you already have a patch for hb-view?
>
> > However, now I see that you are mostly asking about rendering
> > options...
>
> Right now, I want to be able to make hb-view use the TrueType bytecode
> engine.  But I agree that controlling the rendering process itself
> would be very helpful, too.
>
> > That needs some more work.
>
> I presume that you are talking about the FreeType backend, right?
> Most interesting would be to have a possibility to select the
> rendering options on MS Windows, e.g., selecting ClearType...
>
>
>     Werner
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