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      1 /*
      2  * Copyright 2016 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkSVGValue_DEFINED
      9 #define SkSVGValue_DEFINED
     10 
     11 #include "SkColor.h"
     12 #include "SkMatrix.h"
     13 #include "SkPath.h"
     14 #include "SkSVGTypes.h"
     15 #include "SkTypes.h"
     16 
     17 class SkSVGValue : public SkNoncopyable {
     18 public:
     19     enum class Type {
     20         kClip,
     21         kColor,
     22         kFillRule,
     23         kLength,
     24         kLineCap,
     25         kLineJoin,
     26         kNumber,
     27         kPaint,
     28         kPath,
     29         kPoints,
     30         kSpreadMethod,
     31         kString,
     32         kTransform,
     33         kViewBox,
     34     };
     35 
     36     Type type() const { return fType; }
     37 
     38     template <typename T>
     39     const T* as() const {
     40         return fType == T::TYPE ? static_cast<const T*>(this) : nullptr;
     41     }
     42 
     43 protected:
     44     SkSVGValue(Type t) : fType(t) { }
     45 
     46 private:
     47     Type fType;
     48 
     49     typedef SkNoncopyable INHERITED;
     50 };
     51 
     52 template <typename T, SkSVGValue::Type ValueType>
     53 class SkSVGWrapperValue final : public SkSVGValue {
     54 public:
     55     static constexpr Type TYPE = ValueType;
     56 
     57     explicit SkSVGWrapperValue(const T& v)
     58         : INHERITED(ValueType)
     59         , fWrappedValue(v) { }
     60 
     61     operator const T&() const { return fWrappedValue; }
     62     const T* operator->() const { return &fWrappedValue; }
     63 
     64 private:
     65     // Stack-only
     66     void* operator new(size_t) = delete;
     67     void* operator new(size_t, void*) = delete;
     68 
     69     const T& fWrappedValue;
     70 
     71     typedef SkSVGValue INHERITED;
     72 };
     73 
     74 using SkSVGClipValue         = SkSVGWrapperValue<SkSVGClip         , SkSVGValue::Type::kClip     >;
     75 using SkSVGColorValue        = SkSVGWrapperValue<SkSVGColorType    , SkSVGValue::Type::kColor    >;
     76 using SkSVGFillRuleValue     = SkSVGWrapperValue<SkSVGFillRule     , SkSVGValue::Type::kFillRule >;
     77 using SkSVGLengthValue       = SkSVGWrapperValue<SkSVGLength       , SkSVGValue::Type::kLength   >;
     78 using SkSVGPathValue         = SkSVGWrapperValue<SkPath            , SkSVGValue::Type::kPath     >;
     79 using SkSVGTransformValue    = SkSVGWrapperValue<SkSVGTransformType, SkSVGValue::Type::kTransform>;
     80 using SkSVGViewBoxValue      = SkSVGWrapperValue<SkSVGViewBoxType  , SkSVGValue::Type::kViewBox  >;
     81 using SkSVGPaintValue        = SkSVGWrapperValue<SkSVGPaint        , SkSVGValue::Type::kPaint    >;
     82 using SkSVGLineCapValue      = SkSVGWrapperValue<SkSVGLineCap      , SkSVGValue::Type::kLineCap  >;
     83 using SkSVGLineJoinValue     = SkSVGWrapperValue<SkSVGLineJoin     , SkSVGValue::Type::kLineJoin >;
     84 using SkSVGNumberValue       = SkSVGWrapperValue<SkSVGNumberType   , SkSVGValue::Type::kNumber   >;
     85 using SkSVGPointsValue       = SkSVGWrapperValue<SkSVGPointsType   , SkSVGValue::Type::kPoints   >;
     86 using SkSVGStringValue       = SkSVGWrapperValue<SkSVGStringType   , SkSVGValue::Type::kString   >;
     87 using SkSVGSpreadMethodValue = SkSVGWrapperValue<SkSVGSpreadMethod ,
     88                                                  SkSVGValue::Type::kSpreadMethod>;
     89 
     90 #endif // SkSVGValue_DEFINED
     91