third_party/WebKit/Source/platform/geometry/FloatRectOutsets.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FloatRectOutsets_h
#define FloatRectOutsets_h

#include <algorithm>
#include "platform/PlatformExport.h"
#include "platform/wtf/Allocator.h"

namespace blink {

// Specifies floating-point lengths to be used to expand a rectangle.
// For example, |top()| returns the distance the top edge should be moved
// upward.
//
// Negative lengths can be used to express insets.
class PLATFORM_EXPORT FloatRectOutsets {
  STACK_ALLOCATED();

 public:
  FloatRectOutsets() : top_(0), right_(0), bottom_(0), left_(0) {}

  FloatRectOutsets(float top, float right, float bottom, float left)
      : top_(top), right_(right), bottom_(bottom), left_(left) {}

  float Top() const { return top_; }
  float Right() const { return right_; }
  float Bottom() const { return bottom_; }
  float Left() const { return left_; }

  void SetTop(float top) { top_ = top; }
  void SetRight(float right) { right_ = right; }
  void SetBottom(float bottom) { bottom_ = bottom; }
  void SetLeft(float left) { left_ = left; }

  // Change outsets to be at least as large as |other|.
  void Unite(const FloatRectOutsets& other) {
    top_ = std::max(top_, other.top_);
    right_ = std::max(right_, other.right_);
    bottom_ = std::max(bottom_, other.bottom_);
    left_ = std::max(left_, other.left_);
  }

 private:
  float top_;
  float right_;
  float bottom_;
  float left_;
};

}  // namespace blink

#endif  // FloatRectOutsets_h