[HarfBuzz] hb_buffer_get_glyph_positions() for NotoColorEmoji.ttf

[Takao Fujiwara]

Thank you for your reply.

On 05/21/17 10:17, Behdad Esfahbod-san wrote:
> Try using hb-ot-font.h font_funcs instead of hb-ft.h one.  hb-ft needs fixing for bitmap fonts...
>
> On Fri, May 19, 2017 at 1:45 AM, Takao Fujiwara <fujiwara at redhat.com <mailto:fujiwara at redhat.com>> wrote:
>
>     I'd like to get a character width and height and am thinking to use hb_buffer_get_glyph_positions()->x_advance .
>
>     I tried hello-harfbuzz with noto-emoji fonts:
>     https://github.com/behdad/harfbuzz-tutorial/blob/master/hello-harfbuzz.c <https://github.com/behdad/harfbuzz-tutorial/blob/master/hello-harfbuzz.c>
>     https://github.com/googlei18n/noto-emoji/tree/master/fonts <https://github.com/googlei18n/noto-emoji/tree/master/fonts>
>
>     Seems hello-harfbuzz can get x_advance with NotoEmoji-Reqular.ttf but it failed in FT_Set_Char_Size() or FT_Set_Pixel_Sizes() with NotoColorEmoji.ttf.
>     Even if I ignore the return value of FT_THROW(Invalid_Pixel_Size) from FT_Set_Pixel_Sizes(), seems hello-harfbuzz does not return the accurate
>     x_advance.
>
>     Do you have any ideas to resolve it?
>
>     I'm using harfbuzz 1.3.2 and freetype 2.6.5 and testing U+1F469.
>
>     % ./hello-harfbuzz \
>         /usr/share/fonts/google-noto-emoji/NotoColorEmoji.ttf \
>         "👩‍"
>
>     Seems NotoEmoji-Reqular.ttf is a scalable font and NotoColorEmoji.ttf is a fixed size font.
>
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> behdad
> http://behdad.org/