/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_BorderCache_h_
#define mozilla_BorderCache_h_

#include "PLDHashTable.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/gfx/2D.h"

namespace mozilla {
// Cache for best overlap and best dashLength.

struct FourFloats {
  typedef mozilla::gfx::Float Float;

  Float n[4];

  FourFloats() {
    n[0] = 0.0f;
    n[1] = 0.0f;
    n[2] = 0.0f;
    n[3] = 0.0f;
  }

  FourFloats(Float a, Float b, Float c, Float d) {
    n[0] = a;
    n[1] = b;
    n[2] = c;
    n[3] = d;
  }

  bool operator==(const FourFloats&) const = default;
};

class FourFloatsHashKey : public PLDHashEntryHdr {
 public:
  typedef const FourFloats& KeyType;
  typedef const FourFloats* KeyTypePointer;

  explicit FourFloatsHashKey(KeyTypePointer aKey) : mValue(*aKey) {}
  FourFloatsHashKey(const FourFloatsHashKey& aToCopy)
      : mValue(aToCopy.mValue) {}
  ~FourFloatsHashKey() = default;

  KeyType GetKey() const { return mValue; }
  bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mValue; }

  static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
  static PLDHashNumber HashKey(KeyTypePointer aKey) {
    return HashBytes(aKey->n, sizeof(mozilla::gfx::Float) * 4);
  }
  enum { ALLOW_MEMMOVE = true };

 private:
  const FourFloats mValue;
};

}  // namespace mozilla

#endif /* mozilla_BorderCache_h_ */