third_party/WebKit/Source/core/style/ShapeValue.h

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 */

#ifndef ShapeValue_h
#define ShapeValue_h

#include "core/loader/resource/ImageResourceContent.h"
#include "core/style/BasicShapes.h"
#include "core/style/ComputedStyleConstants.h"
#include "core/style/DataEquivalency.h"
#include "core/style/StyleImage.h"
#include "platform/wtf/PassRefPtr.h"

namespace blink {

class ShapeValue final : public GarbageCollectedFinalized<ShapeValue> {
 public:
  enum ShapeValueType {
    // The Auto value is defined by a null ShapeValue*
    kShape,
    kBox,
    kImage
  };

  static ShapeValue* CreateShapeValue(PassRefPtr<BasicShape> shape,
                                      CSSBoxType css_box) {
    return new ShapeValue(std::move(shape), css_box);
  }

  static ShapeValue* CreateBoxShapeValue(CSSBoxType css_box) {
    return new ShapeValue(css_box);
  }

  static ShapeValue* CreateImageValue(StyleImage* image) {
    return new ShapeValue(image);
  }

  ShapeValueType GetType() const { return type_; }
  BasicShape* Shape() const { return shape_.Get(); }

  StyleImage* GetImage() const { return image_.Get(); }
  bool IsImageValid() const {
    if (!GetImage())
      return false;
    if (GetImage()->IsImageResource() || GetImage()->IsImageResourceSet())
      return GetImage()->CachedImage() && GetImage()->CachedImage()->HasImage();
    return GetImage()->IsGeneratedImage();
  }
  void SetImage(StyleImage* image) {
    DCHECK_EQ(GetType(), kImage);
    if (image_ != image)
      image_ = image;
  }
  CSSBoxType CssBox() const { return css_box_; }

  bool operator==(const ShapeValue& other) const;

  DEFINE_INLINE_VIRTUAL_TRACE() { visitor->Trace(image_); }

 private:
  ShapeValue(PassRefPtr<BasicShape> shape, CSSBoxType css_box)
      : type_(kShape), shape_(std::move(shape)), css_box_(css_box) {}
  ShapeValue(ShapeValueType type) : type_(type), css_box_(kBoxMissing) {}
  ShapeValue(StyleImage* image)
      : type_(kImage), image_(image), css_box_(kContentBox) {}
  ShapeValue(CSSBoxType css_box) : type_(kBox), css_box_(css_box) {}

  ShapeValueType type_;
  RefPtr<BasicShape> shape_;
  Member<StyleImage> image_;
  CSSBoxType css_box_;
};

inline bool ShapeValue::operator==(const ShapeValue& other) const {
  if (GetType() != other.GetType())
    return false;

  switch (GetType()) {
    case kShape:
      return DataEquivalent(Shape(), other.Shape()) &&
             CssBox() == other.CssBox();
    case kBox:
      return CssBox() == other.CssBox();
    case kImage:
      return DataEquivalent(GetImage(), other.GetImage());
  }

  NOTREACHED();
  return false;
}

}  // namespace blink

#endif