diff --git a/include/mapnik/image_reader.hpp b/include/mapnik/image_reader.hpp
index 6a6098ea9..edd96b1c3 100644
--- a/include/mapnik/image_reader.hpp
+++ b/include/mapnik/image_reader.hpp
@@ -60,7 +60,7 @@ struct MAPNIK_DECL image_reader : private mapnik::noncopyable
     virtual bool has_alpha() const = 0;
     virtual bool premultiplied_alpha() const = 0;
     virtual void read(unsigned x,unsigned y,image_data_32& image) = 0;
-
+    virtual image_data_any read(unsigned x, unsigned y, unsigned width, unsigned height) = 0;
     virtual ~image_reader() {}
 };
 
diff --git a/src/jpeg_reader.cpp b/src/jpeg_reader.cpp
index d32ef7792..0bbcd2b00 100644
--- a/src/jpeg_reader.cpp
+++ b/src/jpeg_reader.cpp
@@ -81,11 +81,12 @@ public:
     explicit jpeg_reader(std::string const& file_name);
     explicit jpeg_reader(char const* data, size_t size);
     ~jpeg_reader();
-    unsigned width() const;
-    unsigned height() const;
-    inline bool has_alpha() const { return false; }
-    inline bool premultiplied_alpha() const { return true; }
-    void read(unsigned x,unsigned y,image_data_32& image);
+    unsigned width() const final;
+    unsigned height() const final;
+    inline bool has_alpha() const final { return false; }
+    inline bool premultiplied_alpha() const final { return true; }
+    void read(unsigned x,unsigned y,image_data_32& image) final;
+    image_data_any read(unsigned x, unsigned y, unsigned width, unsigned height) final;
 private:
     void init();
     static void on_error(j_common_ptr cinfo);
@@ -312,4 +313,10 @@ void jpeg_reader<T>::read(unsigned x0, unsigned y0, image_data_32& image)
     jpeg_finish_decompress(&cinfo);
 }
 
+template <typename T>
+image_data_any jpeg_reader<T>::read(unsigned x, unsigned y, unsigned width, unsigned height)
+{
+    return image_data_any();
+}
+
 }
diff --git a/src/png_reader.cpp b/src/png_reader.cpp
index 579b8a88f..a79c406d6 100644
--- a/src/png_reader.cpp
+++ b/src/png_reader.cpp
@@ -76,11 +76,12 @@ public:
     explicit png_reader(std::string const& file_name);
     png_reader(char const* data, std::size_t size);
     ~png_reader();
-    unsigned width() const;
-    unsigned height() const;
-    inline bool has_alpha() const { return has_alpha_; }
-    bool premultiplied_alpha() const { return false; } //http://www.libpng.org/pub/png/spec/1.1/PNG-Rationale.html
-    void read(unsigned x,unsigned y,image_data_32& image);
+    unsigned width() const final;
+    unsigned height() const final;
+    inline bool has_alpha() const final { return has_alpha_; }
+    bool premultiplied_alpha() const final { return false; } //http://www.libpng.org/pub/png/spec/1.1/PNG-Rationale.html
+    void read(unsigned x,unsigned y,image_data_32& image) final;
+    image_data_any read(unsigned x, unsigned y, unsigned width, unsigned height) final;
 private:
     void init();
     static void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
@@ -300,4 +301,12 @@ void png_reader<T>::read(unsigned x0, unsigned y0,image_data_32& image)
     }
     png_read_end(png_ptr,0);
 }
+
+
+template <typename T>
+image_data_any png_reader<T>::read(unsigned x, unsigned y, unsigned width, unsigned height)
+{
+    return image_data_any();
+}
+
 }
diff --git a/src/tiff_reader.cpp b/src/tiff_reader.cpp
index 1519b93a2..b0faa3f2d 100644
--- a/src/tiff_reader.cpp
+++ b/src/tiff_reader.cpp
@@ -141,11 +141,12 @@ public:
     explicit tiff_reader(std::string const& file_name);
     tiff_reader(char const* data, std::size_t size);
     virtual ~tiff_reader();
-    unsigned width() const;
-    unsigned height() const;
-    inline bool has_alpha() const { return has_alpha_; }
-    bool premultiplied_alpha() const;
-    void read(unsigned x,unsigned y,image_data_32& image);
+    unsigned width() const final;
+    unsigned height() const final;
+    inline bool has_alpha() const final { return has_alpha_; }
+    bool premultiplied_alpha() const final;
+    void read(unsigned x,unsigned y,image_data_32& image) final;
+    image_data_any read(unsigned x, unsigned y, unsigned width, unsigned height) final;
 private:
     tiff_reader(const tiff_reader&);
     tiff_reader& operator=(const tiff_reader&);
@@ -296,6 +297,12 @@ void tiff_reader<T>::read(unsigned x,unsigned y,image_data_32& image)
     }
 }
 
+template <typename T>
+image_data_any tiff_reader<T>::read(unsigned x, unsigned y, unsigned width, unsigned height)
+{
+    return image_data_any();
+}
+
 template <typename T>
 void tiff_reader<T>::read_generic(unsigned, unsigned, image_data_32&)
 {
diff --git a/src/webp_reader.cpp b/src/webp_reader.cpp
index 44e535716..30aff3bec 100644
--- a/src/webp_reader.cpp
+++ b/src/webp_reader.cpp
@@ -120,11 +120,12 @@ public:
     explicit webp_reader(char const* data, std::size_t size);
     explicit webp_reader(std::string const& filename);
     ~webp_reader();
-    unsigned width() const;
-    unsigned height() const;
-    inline bool has_alpha() const { return has_alpha_; }
-    bool premultiplied_alpha() const { return false; }
-    void read(unsigned x,unsigned y,image_data_32& image);
+    unsigned width() const final;
+    unsigned height() const final;
+    inline bool has_alpha() const final { return has_alpha_; }
+    bool premultiplied_alpha() const final { return false; }
+    void read(unsigned x,unsigned y,image_data_32& image) final;
+    image_data_any read(unsigned x, unsigned y, unsigned width, unsigned height) final;
 private:
     void init();
 };
@@ -260,4 +261,10 @@ void webp_reader<T>::read(unsigned x0, unsigned y0,image_data_32& image)
     }
 }
 
+template <typename T>
+image_data_any webp_reader<T>::read(unsigned x, unsigned y, unsigned width, unsigned height)
+{
+    return image_data_any();
+}
+
 }