android - Kearning between two glyphs skia -

i'm new in skia.

i want know, how kerning(or advance) between 2 glyphs?

in project inluded modul of skia, , in native have

jniexport jint jnicall java_com_example_kernme_nativeskia_gethellofromnative(jnienv *env,         jclass clazz, jobject assetmanager, jstring path, jstring text) {  aassetmanager *mgr = aassetmanager_fromjava(env, assetmanager);     if (mgr == null)         return false;     const char *nativestring = env->getstringutfchars(path, 0);    aasset* asset = aassetmanager_open(mgr, nativestring, aasset_mode_buffer); if (null == asset)     return false;  skstream* stream = new assetstream(asset, true); sktypeface* face = sktypeface::createfromstream(stream); if(face == null)     return false; 

in jstring have 2 symbols("ab"), want create gplyphs , information glyphs(etc. advance, kearning). i'm seeking function this:

int get_kerning(leftglyph, rightglyph) 

thanks!!!