start a wrapper for color fonts

src/fonts/SkGScalerContext.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkGScalerContext_DEFINED
+#define SkGScalerContext_DEFINED
+
+#include "SkScalerContext.h"
+#include "SkTypeface.h"
+
+class SkGTypeface : public SkTypeface {
+public:
+    SkGTypeface(SkTypeface* proxy, const SkPaint&);
+    virtual ~SkGTypeface();
+    
+    SkTypeface* proxy() const { return fProxy; }
+    const SkPaint& paint() const { return fPaint; }
+
+protected:
+    virtual SkScalerContext* onCreateScalerContext(const SkDescriptor*) const SK_OVERRIDE;
+    virtual void onFilterRec(SkScalerContextRec*) const SK_OVERRIDE;
+    virtual SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
+                                    SkAdvancedTypefaceMetrics::PerGlyphInfo,
+                                    const uint32_t* glyphIDs,
+                                    uint32_t glyphIDsCount) const SK_OVERRIDE;
+    virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE;
+    virtual void onGetFontDescriptor(SkFontDescriptor*, bool* isLocal) const SK_OVERRIDE;
+    
+    virtual int onGetUPEM() const SK_OVERRIDE;
+    
+    virtual int onGetTableTags(SkFontTableTag tags[]) const SK_OVERRIDE;
+    virtual size_t onGetTableData(SkFontTableTag, size_t offset,
+                                  size_t length, void* data) const SK_OVERRIDE;
+    
+private:
+    SkTypeface* fProxy;
+    SkPaint     fPaint;
+};
+
+#endif