gdiplus: GdipGetFontHeightGivenDPI: Return a valid value for UnitPixel.

dlls/gdiplus/font.c

@@ -428,12 +428,22 @@ GpStatus WINGDIPAPI GdipGetFontHeight(GDIPCONST GpFont *font,
  */
 GpStatus WINGDIPAPI GdipGetFontHeightGivenDPI(GDIPCONST GpFont *font, REAL dpi, REAL *height)
 {
+    TRACE("%p (%s), %f, %p\n", font,
+            debugstr_w(font->lfw.lfFaceName), dpi, height);
+
     if (!(font && height)) return InvalidParameter;
 
-    FIXME("%p (%s), %f, %p\n", font,
-            debugstr_w(font->lfw.lfFaceName), dpi, height);
+    switch (font->unit)
+    {
+        case UnitPixel:
+            *height = font->emSize;
+            break;
+        default:
+            FIXME("Unhandled unit type: %d\n", font->unit);
+            return NotImplemented;
+    }
 
-    return NotImplemented;
+    return Ok;
 }
 
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