Issue: FreeTypeSharp does not support sbix

[malvislight]

Hi!

Currently FreeTypeSharp cannot render sbix fonts (like Apple Color Emoji) because FreeType is compiled without libpng support.

When trying to load Apple Color Emoji glyphs:

• FT_HAS_SBIX returns true
• FT_Load_Glyph returns FT_Err_Unimplemented_Feature

The sbix format stores PNG images inside the font, so FreeType needs libpng to decode them.

Would it be possible to compile the native binaries with libpng enabled?

CMake flag: -DFT_REQUIRE_PNG=ON

[ryancheung]

I remembered Freetype2 does not support the Apple Color Emoji font.

[malvislight]

I created a fork of your repository and enabled libpng. So Apple Color Emoji Font works good

[ryancheung]

That's cool!

Just googled and found "FreeType supports Apple's emoji fonts, primarily through its SVG (OpenType-SVG) driver, added in version 2.12". I shall enable libpng for the native libs

[malvislight]

by the way, I am making a professional text component for Unity according to all international standards and rules of the Unicode Consortium. I use HarfBuzz and your FreeTypeSharp. So thank you so much for your work! It helped me a lot.

[malvislight]

Also you can see my fork if it can be helpful for you

https://github.com/LightSideMeowshop/freetype