jboolean Java_android_filterfw_core_GLFrame_setNativeViewport(JNIEnv* env, jobject thiz, jint x, jint y, jint width, jint height) { GLFrame* frame = ConvertFromJava<GLFrame>(env, thiz); return frame ? ToJBool(frame->SetViewport(x, y, width, height)) : JNI_FALSE; }