Implement onMatchFamilyStyleCharacter for DirectWrite.

src/utils/win/SkDWrite.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDWrite_DEFINED
 #define SkDWrite_DEFINED
 
 #include "SkTemplates.h"
+#include "SkFontStyle.h"
 
 #include <dwrite.h>
 #include <winsdkver.h>
 
 class SkString;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Factory
 
 #ifndef SK_HAS_DWRITE_1_H
@@ skipping 51 matching lines @@
 };
 template<typename T> class AutoTDWriteTable : public AutoDWriteTable {
 public:
     static const UINT32 tag = DWRITE_MAKE_OPENTYPE_TAG(T::TAG0, T::TAG1, T::TAG2, T::TAG3);
     AutoTDWriteTable(IDWriteFontFace* fontFace) : AutoDWriteTable(fontFace, tag) { }
 
     const T* get() const { return reinterpret_cast<const T*>(fData); }
     const T* operator->() const { return reinterpret_cast<const T*>(fData); }
 };
 
+////////////////////////////////////////////////////////////////////////////////
+// Style conversion
+
+struct DWriteStyle {
+    explicit DWriteStyle(const SkFontStyle& pattern) {
+        switch (pattern.slant()) {
+        case SkFontStyle::kUpright_Slant:
+            fSlant = DWRITE_FONT_STYLE_NORMAL;
+            break;
+        case SkFontStyle::kItalic_Slant:
+            fSlant = DWRITE_FONT_STYLE_ITALIC;
+            break;
+        default:
+            SkASSERT(false);
+        }
+
+        fWeight = (DWRITE_FONT_WEIGHT)pattern.weight();
+        fWidth = (DWRITE_FONT_STRETCH)pattern.width();
+    }
+    DWRITE_FONT_STYLE fSlant;
+    DWRITE_FONT_WEIGHT fWeight;
+    DWRITE_FONT_STRETCH fWidth;
+};
+
 #endif