From 1c00a46c7a608ebc0b03c5abfcfe7f2b9881d0df Mon Sep 17 00:00:00 2001
From: Ebrahim Byagowi <ebrahim@gnu.org>
Date: Wed, 30 Mar 2016 20:15:09 +0000
Subject: [PATCH] Make DirectWrite backend to work with different font sizes

Actually copyedited same logic from Uniscribe to make it just work
---
 src/hb-directwrite.cc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/hb-directwrite.cc b/src/hb-directwrite.cc
index af0fd3da0..fd8ab5cfe 100644
--- a/src/hb-directwrite.cc
+++ b/src/hb-directwrite.cc
@@ -739,6 +739,11 @@ _hb_directwrite_shape(hb_shape_plan_t    *shape_plan,
 
 #undef ALLOCATE_ARRAY
 
+  int font_size = font->face->get_upem();
+  if (font_size < 0)
+	  font_size = -font_size;
+  int x_mult = (double)font->x_scale / font_size;
+
   hr = analyzer->GetGlyphPlacements(pchars,
     clusters,
     textProperties,
@@ -747,7 +752,7 @@ _hb_directwrite_shape(hb_shape_plan_t    *shape_plan,
     glyphProperties,
     actualGlyphs,
     fontFace,
-    face->get_upem(),
+    font_size * x_mult,
     FALSE,
     FALSE,
     &runHead->mScript,