Implement map projection functionality (#254)

* Implement map projection functionality

* Add missing MGL_EXPORT

* Remove the automatic copyright header

include/mbgl/map/map.hpp

@@ -23,6 +23,7 @@
 namespace mbgl {
 
 class RendererFrontend;
+class TransformState;
 
 namespace style {
 class Image;
@@ -110,6 +111,9 @@ public:
     std::vector<ScreenCoordinate> pixelsForLatLngs(const std::vector<LatLng>&) const;
     std::vector<LatLng> latLngsForPixels(const std::vector<ScreenCoordinate>&) const;
 
+    // Transform
+    TransformState getTransfromState() const;
+
     // Annotations
     void addAnnotationImage(std::unique_ptr<style::Image>);
     void removeAnnotationImage(const std::string&);

include/mbgl/map/map_projection.hpp

@@ -0,0 +1,30 @@
+#include <mbgl/map/camera.hpp>
+#include <mbgl/map/map.hpp>
+#include <mbgl/util/noncopyable.hpp>
+#include <mbgl/util/geo.hpp>
+
+#include <memory>
+
+namespace mbgl {
+
+class Transform;
+
+class MapProjection : private util::noncopyable {
+public:
+    explicit MapProjection(const Map&);
+    ~MapProjection();
+
+    ScreenCoordinate pixelForLatLng(const LatLng&) const;
+    LatLng latLngForPixel(const ScreenCoordinate&) const;
+
+    void setCamera(const CameraOptions&);
+    CameraOptions getCamera() const;
+
+    /// Set the underneath camera so the requested coordinates are visible with the inset.
+    void setVisibleCoordinates(const std::vector<LatLng>&, const EdgeInsets&);
+
+private:
+    std::unique_ptr<Transform> transform;
+};
+
+} // namespace mbgl