From da239edfb975a281740a72d0656d820a84f5d5be Mon Sep 17 00:00:00 2001
From: David Ludwig <dludwig@pobox.com>
Date: Sun, 25 Nov 2012 23:27:12 -0500
Subject: [PATCH] WinRT: fixed incorrect cursor positions when using non-native
 screen resolutions

---
 src/video/windowsrt/SDL_WinRTApp.cpp | 16 +++++++++++++++-
 src/video/windowsrt/SDL_WinRTApp.h   |  1 +
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/video/windowsrt/SDL_WinRTApp.cpp b/src/video/windowsrt/SDL_WinRTApp.cpp
index 15ee94973..87a5f0367 100644
--- a/src/video/windowsrt/SDL_WinRTApp.cpp
+++ b/src/video/windowsrt/SDL_WinRTApp.cpp
@@ -167,11 +167,25 @@ void SDL_WinRTApp::OnPointerReleased(CoreWindow^ sender, PointerEventArgs^ args)
     }
 }
 
+// Applies necessary geometric transformations to raw cursor positions:
+Point SDL_WinRTApp::TransformCursor(Point rawPosition)
+{
+    if ( ! m_sdlWindowData || ! m_sdlWindowData->sdlWindow ) {
+        return rawPosition;
+    }
+    CoreWindow ^ nativeWindow = CoreWindow::GetForCurrentThread();
+    Point outputPosition;
+    outputPosition.X = rawPosition.X * (((float32)m_sdlWindowData->sdlWindow->w) / nativeWindow->Bounds.Width);
+    outputPosition.Y = rawPosition.Y * (((float32)m_sdlWindowData->sdlWindow->h) / nativeWindow->Bounds.Height);
+    return outputPosition;
+}
+
 void SDL_WinRTApp::OnPointerMoved(CoreWindow^ sender, PointerEventArgs^ args)
 {
     if (m_sdlWindowData)
     {
-        SDL_SendMouseMotion(m_sdlWindowData->sdlWindow, 0, (int)args->CurrentPoint->Position.X, (int)args->CurrentPoint->Position.Y);
+        Point transformedPoint = TransformCursor(args->CurrentPoint->Position);
+        SDL_SendMouseMotion(m_sdlWindowData->sdlWindow, 0, (int)transformedPoint.X, (int)transformedPoint.Y);
     }
 }
 
diff --git a/src/video/windowsrt/SDL_WinRTApp.h b/src/video/windowsrt/SDL_WinRTApp.h
index 48c1b7713..f00417327 100644
--- a/src/video/windowsrt/SDL_WinRTApp.h
+++ b/src/video/windowsrt/SDL_WinRTApp.h
@@ -28,6 +28,7 @@ ref class SDL_WinRTApp sealed : public Windows::ApplicationModel::Core::IFramewo
     void SetSDLWindowData(const SDL_WindowData * windowData);
     void UpdateWindowFramebuffer(SDL_Surface * surface, SDL_Rect * rects, int numrects);
     void ResizeMainTexture(int w, int h);
+    Windows::Foundation::Point TransformCursor(Windows::Foundation::Point rawPosition);
 
 protected:
 	// Event Handlers.