Platform: added Sdl2Application::windowSize().

src/Magnum/Platform/Sdl2Application.cpp

@@ -273,6 +273,12 @@ bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
     return true;
 }
 
+Vector2i Sdl2Application::windowSize() {
+    Vector2i size;
+    SDL_GetWindowSize(_window, &size.x(), &size.y());
+    return size;
+}
+
 void Sdl2Application::swapBuffers() {
     #ifndef CORRADE_TARGET_EMSCRIPTEN
     SDL_GL_SwapWindow(_window);

src/Magnum/Platform/Sdl2Application.h

@@ -421,6 +421,15 @@ class Sdl2Application {
 
         /** @{ @name Screen handling */
 
+        /**
+         * @brief Window size
+         *
+         * Window size to which all input event coordinates can be related.
+         * Note that especially on HiDPI systems the reported window size might
+         * not be the same as framebuffer size.
+         */
+        Vector2i windowSize();
+
         /**
          * @brief Swap buffers
          *