diff --git a/windows/area.h b/windows/area.h
index 73ea30c6..f60bf06f 100644
--- a/windows/area.h
+++ b/windows/area.h
@@ -41,3 +41,6 @@ extern void unregisterAreaFilter(void);
 
 // areautil.c
 extern void renderTargetGetSize(ID2D1RenderTarget *rt, D2D1_SIZE_F *size);
+extern void loadAreaSize(uiArea *a, ID2D1RenderTarget *rt, double *width, double *height);
+extern void pixelsToDIP(uiArea *a, double *x, double *y);
+extern void dipToPixels(uiArea *a, double *x, double *y);
diff --git a/windows/areadraw.c b/windows/areadraw.c
index a6cd3ac8..95c3cbf0 100644
--- a/windows/areadraw.c
+++ b/windows/areadraw.c
@@ -8,17 +8,10 @@ static HRESULT doPaint(uiArea *a, ID2D1RenderTarget *rt, RECT *clip)
 	uiAreaDrawParams dp;
 	COLORREF bgcolorref;
 	D2D1_COLOR_F bgcolor;
-	D2D1_SIZE_F size;
 
 	dp.Context = newContext(rt);
 
-	dp.AreaWidth = 0;
-	dp.AreaHeight = 0;
-	if (!a->scrolling) {
-		renderTargetGetSize(rt, &size);
-		dp.AreaWidth = size.width;
-		dp.AreaHeight = size.height;
-	}
+	loadAreaSize(a, rt, &(dp.AreaWidth), &(dp.AreaHeight));
 
 	dp.ClipX = clip->left;
 	dp.ClipY = clip->top;
diff --git a/windows/areaevents.c b/windows/areaevents.c
index a61b25fe..5af03e32 100644
--- a/windows/areaevents.c
+++ b/windows/areaevents.c
@@ -81,8 +81,6 @@ static void areaMouseEvent(uiArea *a, uintmax_t down, uintmax_t  up, WPARAM wPar
 	RECT client;
 	BOOL inClient;
 	double xpix, ypix;
-	FLOAT dpix, dpiy;
-	D2D1_SIZE_F size;
 
 	if (a->capturing) {
 		clientpt.x = GET_X_LPARAM(lParam);
@@ -104,18 +102,9 @@ static void areaMouseEvent(uiArea *a, uintmax_t down, uintmax_t  up, WPARAM wPar
 	xpix = (double) GET_X_LPARAM(lParam);
 	ypix = (double) GET_Y_LPARAM(lParam);
 	// these are in pixels; we need points
-	ID2D1HwndRenderTarget_GetDpi(a->rt, &dpix, &dpiy);
-	// see https://msdn.microsoft.com/en-us/library/windows/desktop/dd756649%28v=vs.85%29.aspx (and others; search "direct2d mouse")
-	me.X = (xpix * 96) / dpix;
-	me.Y = (ypix * 96) / dpiy;
+	pixelsToDIP(a, &xpix, &ypix);
 
-	me.AreaWidth = 0;
-	me.AreaHeight = 0;
-	if (!a->scrolling) {
-		renderTargetGetSize((ID2D1RenderTarget *) (a->rt), &size);
-		me.AreaWidth = size.width;
-		me.AreaHeight = size.height;
-	}
+	loadAreaSize(a, NULL, &(me.AreaWidth), &(me.AreaHeight));
 
 	me.Down = down;
 	me.Up = up;
diff --git a/windows/areautil.c b/windows/areautil.c
index f1b9377c..3373fc0c 100644
--- a/windows/areautil.c
+++ b/windows/areautil.c
@@ -17,3 +17,37 @@ void renderTargetGetSize(ID2D1RenderTarget *rt, D2D1_SIZE_F *size)
 	f = (fptr) (rt->lpVtbl->GetSize);
 	(*f)(rt, size);
 }
+
+void loadAreaSize(uiArea *a, ID2D1RenderTarget *rt, double *width, double *height)
+{
+	D2D1_SIZE_F size;
+
+	*width = 0;
+	*height = 0;
+	if (!a->scrolling) {
+		if (rt == NULL)
+			rt = (ID2D1RenderTarget *) (a->rt);
+		renderTargetGetSize(rt, &size);
+		*width = size.width;
+		*height = size.height;
+	}
+}
+
+void pixelsToDIP(uiArea *a, double *x, double *y)
+{
+	FLOAT dpix, dpiy;
+
+	ID2D1HwndRenderTarget_GetDpi(a->rt, &dpix, &dpiy);
+	// see https://msdn.microsoft.com/en-us/library/windows/desktop/dd756649%28v=vs.85%29.aspx (and others; search "direct2d mouse")
+	*x = (*x * 96) / dpix;
+	*y = (*y * 96) / dpiy;
+}
+
+void dipToPixels(uiArea *a, double *x, double *y)
+{
+	FLOAT dpix, dpiy;
+
+	ID2D1HwndRenderTarget_GetDpi(a->rt, &dpix, &dpiy);
+	*x = (*x * dpix) / 96;
+	*y = (*y * dpiy) / 96;
+}