getNativeTypeface

    568     static jfloat measureText_StringI(JNIEnv* env, jobject jpaint, jstring text, jint bidiFlags) {
    569         NPE_CHECK_RETURN_ZERO(env, jpaint);
    570         NPE_CHECK_RETURN_ZERO(env, text);
    571 
    572         size_t textLength = env->GetStringLength(text);
    573         if (textLength == 0) {
    574             return 0;
    575         }
    576 
    577         const jchar* textArray = env->GetStringChars(text, NULL);
    578         Paint* paint = GraphicsJNI::getNativePaint(env, jpaint);
    579         jfloat width = 0;
    580 
    581         Layout layout;
    582         TypefaceImpl* typeface = GraphicsJNI::getNativeTypeface(env, jpaint);
    583         MinikinUtils::doLayout(&layout, paint, bidiFlags, typeface, textArray, 0, textLength, textLength);
    584         width = layout.getAdvance();
    585 
    586         env->ReleaseStringChars(text, textArray);
    587         return width;
    588     }

    383 android::TypefaceImpl* GraphicsJNI::getNativeTypeface(JNIEnv* env, jobject paint) {
    384     SkASSERT(env);
    385     SkASSERT(paint);
    386     SkASSERT(env->IsInstanceOf(paint, gPaint_class));
    387     jlong typefaceHandle = env->GetLongField(paint, gPaint_nativeTypefaceID);
    388     android::TypefaceImpl* p = reinterpret_cast<android::TypefaceImpl*>(typefaceHandle);
    389     return p;
    390 }

    169 static jclass   gPaint_class;
    170 static jfieldID gPaint_nativeInstanceID;
    171 static jfieldID gPaint_nativeTypefaceID;

    691 int register_android_graphics_Graphics(JNIEnv* env)
    692 {
    693     jmethodID m;
    694     jclass c;    
    731     gPaint_class = make_globalref(env, "android/graphics/Paint");
    732     gPaint_nativeInstanceID = getFieldIDCheck(env, gPaint_class, "mNativePaint", "J");
    733     gPaint_nativeTypefaceID = getFieldIDCheck(env, gPaint_class, "mNativeTypeface", "J");
    754     return 0;
    755 }