[core] Added Viewport mode

Satisfies embedding platforms that requires the viewport coordinate
systems to be set according to its standards e.g. viewport mirrored
vertically.

2 files changed, 14 insertions, 2 deletions

diff --git a/include/mbgl/map/map.hpp b/include/mbgl/map/map.hpp
index 3200484ec1..1042d97574 100644
--- a/include/mbgl/map/map.hpp
+++ b/include/mbgl/map/map.hpp
@@ -34,7 +34,8 @@ public:
     explicit Map(View&, FileSource&,
                  MapMode mapMode = MapMode::Continuous,
                  GLContextMode contextMode = GLContextMode::Unique,
-                 ConstrainMode constrainMode = ConstrainMode::HeightOnly);
+                 ConstrainMode constrainMode = ConstrainMode::HeightOnly,
+                 ViewportMode viewportMode = ViewportMode::Default);
     ~Map();
 
     // Register a callback that will get called (on the render thread) when all resources have
@@ -117,11 +118,15 @@ public:
     // North Orientation
     void setNorthOrientation(NorthOrientation);
     NorthOrientation getNorthOrientation() const;
-    
+
     // Constrain mode
     void setConstrainMode(ConstrainMode);
     ConstrainMode getConstrainMode() const;
 
+    // Viewport mode
+    void setViewportMode(ViewportMode);
+    ViewportMode getViewportMode() const;
+
     // Size
     uint16_t getWidth() const;
     uint16_t getHeight() const;
diff --git a/include/mbgl/map/mode.hpp b/include/mbgl/map/mode.hpp
index 7fd1a7f522..9302e36056 100644
--- a/include/mbgl/map/mode.hpp
+++ b/include/mbgl/map/mode.hpp
@@ -29,6 +29,13 @@ enum class ConstrainMode : EnumType {
     WidthAndHeight,
 };
 
+// Satisfies embedding platforms that requires the viewport coordinate systems
+// to be set according to its standards.
+enum class ViewportMode : EnumType {
+    Default,
+    FlippedY,
+};
+
 enum class MapDebugOptions : EnumType {
     NoDebug     = 0,
     TileBorders = 1 << 1,