flutter_flutter/sky/engine/platform/geometry/RoundedRect.h

/*
 * Copyright (C) 2003, 2006, 2009 Apple Inc. All rights reserved.
 * Copyright (C) 2010 Google Inc. 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 APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS CONTRIBUTORS 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 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_ROUNDEDRECT_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_ROUNDEDRECT_H_

#include "flutter/sky/engine/platform/geometry/FloatQuad.h"
#include "flutter/sky/engine/platform/geometry/IntRect.h"

namespace blink {

// This class is used to represent rectangles with rounded corners. It is only
// used for painting. It uses integer units because using layout units leads to
// blurry rounded corners.
class PLATFORM_EXPORT RoundedRect {
 public:
  class PLATFORM_EXPORT Radii {
   public:
    Radii() {}
    Radii(const IntSize& topLeft,
          const IntSize& topRight,
          const IntSize& bottomLeft,
          const IntSize& bottomRight)
        : m_topLeft(topLeft),
          m_topRight(topRight),
          m_bottomLeft(bottomLeft),
          m_bottomRight(bottomRight) {}

    void setTopLeft(const IntSize& size) { m_topLeft = size; }
    void setTopRight(const IntSize& size) { m_topRight = size; }
    void setBottomLeft(const IntSize& size) { m_bottomLeft = size; }
    void setBottomRight(const IntSize& size) { m_bottomRight = size; }
    const IntSize& topLeft() const { return m_topLeft; }
    const IntSize& topRight() const { return m_topRight; }
    const IntSize& bottomLeft() const { return m_bottomLeft; }
    const IntSize& bottomRight() const { return m_bottomRight; }

    bool isZero() const;

    void includeLogicalEdges(const Radii& edges,
                             bool includeLogicalLeftEdge,
                             bool includeLogicalRightEdge);

    void scale(float factor);
    void expand(int topWidth, int bottomWidth, int leftWidth, int rightWidth);
    void expand(int size) { expand(size, size, size, size); }
    void shrink(int topWidth, int bottomWidth, int leftWidth, int rightWidth) {
      expand(-topWidth, -bottomWidth, -leftWidth, -rightWidth);
    }
    void shrink(int size) { shrink(size, size, size, size); }

   private:
    IntSize m_topLeft;
    IntSize m_topRight;
    IntSize m_bottomLeft;
    IntSize m_bottomRight;
  };

  explicit RoundedRect(const IntRect&, const Radii& = Radii());
  RoundedRect(int x, int y, int width, int height);
  RoundedRect(const IntRect&,
              const IntSize& topLeft,
              const IntSize& topRight,
              const IntSize& bottomLeft,
              const IntSize& bottomRight);

  const IntRect& rect() const { return m_rect; }
  const Radii& radii() const { return m_radii; }
  bool isRounded() const { return !m_radii.isZero(); }
  bool isEmpty() const { return m_rect.isEmpty(); }

  // Returns a quickly computed rect enclosed by the rounded rect.
  IntRect radiusCenterRect() const;

  void setRect(const IntRect& rect) { m_rect = rect; }
  void setRadii(const Radii& radii) { m_radii = radii; }

  void move(const IntSize& size) { m_rect.move(size); }
  void inflate(int size) { m_rect.inflate(size); }
  void inflateWithRadii(int size);
  void expandRadii(int size) { m_radii.expand(size); }
  void shrinkRadii(int size) { m_radii.shrink(size); }

  void includeLogicalEdges(const Radii& edges,
                           bool includeLogicalLeftEdge,
                           bool includeLogicalRightEdge);

  bool isRenderable() const;
  void adjustRadii();

  // Tests whether the quad intersects any part of this rounded rectangle.
  // This only works for convex quads.
  bool intersectsQuad(const FloatQuad&) const;

 private:
  IntRect m_rect;
  Radii m_radii;
};

inline bool operator==(const RoundedRect::Radii& a,
                       const RoundedRect::Radii& b) {
  return a.topLeft() == b.topLeft() && a.topRight() == b.topRight() &&
         a.bottomLeft() == b.bottomLeft() && a.bottomRight() == b.bottomRight();
}

inline bool operator!=(const RoundedRect::Radii& a,
                       const RoundedRect::Radii& b) {
  return !(a == b);
}

inline bool operator==(const RoundedRect& a, const RoundedRect& b) {
  return a.rect() == b.rect() && a.radii() == b.radii();
}

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_ROUNDEDRECT_H_