The code in src/hbshaper.h is doing its own kerning by calling hb_font_get_glyph_kerning_for_direction. This is unnecessary, as HarfBuzz will take care of it via the font’s own kern feature. DejaVu Sans has this.

Hello there,
I would like to render text which includes emojies into .png file.
Now I am able to render complex languages characters, but I'm still not able to render emojies as there is no 'Harfbuzz script' type for it.
In harfbuzz-example/src/main.cc line 37 a Harfbuzz text is created as follows, for Arabic language for example:

HBText hbt2 = {
       "تسجّل يتكلّم",
       "ar",
       HB_SCRIPT_ARABIC,
       HB_DIRECTION_RTL
   };

The HB_SCRIPT_ARABIC is a 'Harfbuzz script' type called from hb-common.h .
And then we are passing this text to the shaper which has been assigned with a specific font.
what I need now is: HB_SCRIPT_EMOJI or something similar in order to render emojies into .png file same as what we are applying with languages.

what am I messing? How can I render the emoji into .png using Harfbuzz?
And is there a ready script which I can use to render text into .png (no matter if the text includes emojies, arabic, english or indian all together)?

First of all, thank for your work.
I send you a feedback because I love what you have put together and maybe this feedback is useful (or maybe as we are talking about an outdated Visual Studio version, just trash it :)

1. assert(!FT_New_Face(lib, fontName.c_str(), 0, face)) is wrong because "assert(x)" is defined as "void(0)" so in release the code is not executed anymore. Need to remove the assert.
   Or rewrite the code
   assert(glewInit() == GLEW_OK);
   becomes
   GLenum initOk = glewInit();assert(initOk == GLEW_OK);

2. Missing preprocessor define "GLEW_STATIC" in "harfbuzz-example.out" project, otherwise link errors with glew

3. VC2012 is not fully C++0X compilant.
   static const GLchar* vertexSrc =R"END(.... doesn't compile
   I need to use
   static const GLchar* vertexSrc ="attribute vec4 a_position;" "attribute vec2 a_uv;" ...

4. VC2012 is not fully C++0X compilant.
   vertices[0] = { x0,y0, s0,t0 };doesn't compile
   I had to write a constructor Vertex(float _x, float _y, float _s, float _t) : x(_x), y(_y), s(_s), t(_t) {}
   and use vertices[0] = gl::Vertex( x0,y0, s0,t0 );

5. Post-build to copy the fonts don't work. -minor problem-

Again thanks !

On my Debian Unstable system, I got an error message that the “-stdlib=libc++” option was not recognized. When I removed that, it built fine.

Patch enclosed.

Really not a big deal but I had to add that #include in order to avoid a compilation error. In my experience, what's provided by system header files varies between compiler versions, and since uint32_t is used in the freetypelib.h, maybe the source code is not compliant with the C++ standard without that #include.

Other than that, works like charm on my Ubuntu machine. Beautiful! Thanks.

I have use the demo on android. but didn't draw anything.

For some reason, the file fonts/Sanskrit2003.ttf has the x bits set in its mode. Might be an idea to remove these.

[ 99%] Built target icucommon
Linking CXX executable bin/harfbuzz-example.out
harfbuzz-icu-freetype/libharfbuzz.a(hb-ft.cc.o): In function hb_ft_font_set_funcs': hb-ft.cc:(.text+0x109e): undefined reference to FT_Set_Var_Blend_Coordinates'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/harfbuzz-example.out] Error 1
make[1]: *** [CMakeFiles/harfbuzz-example.out.dir/all] Error 2
make: *** [all] Error 2