Make pixelRatio constant across a Map object lifetime

also moves framebuffer size out of TransformState into its own object

android/cpp/native_map_view.cpp

@@ -52,8 +52,9 @@ void log_gl_string(GLenum name, const char *label) {
     }
 }
 
-NativeMapView::NativeMapView(JNIEnv *env, jobject obj_)
+NativeMapView::NativeMapView(JNIEnv *env, jobject obj_, float pixelRatio_)
     : mbgl::View(*this),
+      pixelRatio(pixelRatio_),
       fileCache(mbgl::android::cachePath + "/mbgl-cache.db"),
       fileSource(&fileCache),
       map(*this, fileSource, MapMode::Continuous) {
@@ -98,6 +99,18 @@ NativeMapView::~NativeMapView() {
     vm = nullptr;
 }
 
+float NativeMapView::getPixelRatio() const {
+    return pixelRatio;
+}
+
+std::array<uint16_t, 2> NativeMapView::getSize() const {
+    return {{ static_cast<uint16_t>(width), static_cast<uint16_t>(height) }};
+}
+
+std::array<uint16_t, 2> NativeMapView::getFramebufferSize() const {
+    return {{ static_cast<uint16_t>(fbWidth), static_cast<uint16_t>(fbHeight) }};
+}
+
 void NativeMapView::activate() {
     mbgl::Log::Debug(mbgl::Event::Android, "NativeMapView::activate");
     if ((display != EGL_NO_DISPLAY) && (surface != EGL_NO_SURFACE) && (context != EGL_NO_CONTEXT)) {
@@ -754,5 +767,16 @@ void NativeMapView::onInvalidate() {
     }
 }
 
+void NativeMapView::resizeView(int w, int h) {
+    width = w;
+    height = h;
+    map.update(mbgl::Update::Dimensions);
+}
+
+void NativeMapView::resizeFramebuffer(int w, int h) {
+    fbWidth = w;
+    fbHeight = h;
+}
+
 }
 }