[SVGDom] Add more presentation attributes.

experimental/svg/model/SkSVGValue.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkSVGValue_DEFINED
 #define SkSVGValue_DEFINED
 
 #include "SkColor.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
 #include "SkSVGTypes.h"
 #include "SkTypes.h"
 
 class SkSVGValue : public SkNoncopyable {
 public:
     enum class Type {
         kColor,
         kLength,
+        kLineCap,
+        kLineJoin,
+        kNumber,
+        kPaint,
         kPath,
         kTransform,
         kViewBox,
     };
 
     Type type() const { return fType; }
 
     template <typename T>
     const T* as() const {
         return fType == T::TYPE ? static_cast<const T*>(this) : nullptr;
@@ skipping 11 matching lines @@
 template <typename T, SkSVGValue::Type ValueType>
 class SkSVGWrapperValue final : public SkSVGValue {
 public:
     static constexpr Type TYPE = ValueType;
 
     explicit SkSVGWrapperValue(const T& v)
         : INHERITED(ValueType)
         , fWrappedValue(v) { }
 
     operator const T&() const { return fWrappedValue; }
+    const T* operator->() const { return &fWrappedValue; }
 
 private:
     // Stack-only
     void* operator new(size_t) = delete;
     void* operator new(size_t, void*) = delete;
 
     const T& fWrappedValue;
 
     typedef SkSVGValue INHERITED;
 };
 
 using SkSVGColorValue     = SkSVGWrapperValue<SkSVGColorType    , SkSVGValue::Type::kColor    >;
 using SkSVGLengthValue    = SkSVGWrapperValue<SkSVGLength       , SkSVGValue::Type::kLength   >;
 using SkSVGPathValue      = SkSVGWrapperValue<SkPath            , SkSVGValue::Type::kPath     >;
 using SkSVGTransformValue = SkSVGWrapperValue<SkSVGTransformType, SkSVGValue::Type::kTransform>;
 using SkSVGViewBoxValue   = SkSVGWrapperValue<SkSVGViewBoxType  , SkSVGValue::Type::kViewBox  >;
+using SkSVGPaintValue     = SkSVGWrapperValue<SkSVGPaint        , SkSVGValue::Type::kPaint    >;
+using SkSVGLineCapValue   = SkSVGWrapperValue<SkSVGLineCap      , SkSVGValue::Type::kLineCap  >;
+using SkSVGLineJoinValue  = SkSVGWrapperValue<SkSVGLineJoin     , SkSVGValue::Type::kLineJoin >;
+using SkSVGNumberValue    = SkSVGWrapperValue<SkSVGNumberType   , SkSVGValue::Type::kNumber   >;
 
 #endif // SkSVGValue_DEFINED