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

/*
 * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
 * Copyright (C) 2005 Nokia.  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 COMPUTER, INC. ``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 COMPUTER, INC. OR
 * 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
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_FLOATRECT_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_FLOATRECT_H_

#include "flutter/sky/engine/platform/geometry/FloatPoint.h"
#include "flutter/sky/engine/wtf/Vector.h"
#include "third_party/skia/include/core/SkRect.h"

namespace blink {

class LayoutRect;
class IntRect;

class PLATFORM_EXPORT FloatRect {
 public:
  enum ContainsMode { InsideOrOnStroke, InsideButNotOnStroke };

  FloatRect() {}
  FloatRect(const FloatPoint& location, const FloatSize& size)
      : m_location(location), m_size(size) {}
  FloatRect(float x, float y, float width, float height)
      : m_location(FloatPoint(x, y)), m_size(FloatSize(width, height)) {}
  FloatRect(const IntRect&);
  FloatRect(const LayoutRect&);
  FloatRect(const SkRect&);

  static FloatRect narrowPrecision(double x,
                                   double y,
                                   double width,
                                   double height);

  FloatPoint location() const { return m_location; }
  FloatSize size() const { return m_size; }

  void setLocation(const FloatPoint& location) { m_location = location; }
  void setSize(const FloatSize& size) { m_size = size; }

  float x() const { return m_location.x(); }
  float y() const { return m_location.y(); }
  float maxX() const { return x() + width(); }
  float maxY() const { return y() + height(); }
  float width() const { return m_size.width(); }
  float height() const { return m_size.height(); }

  void setX(float x) { m_location.setX(x); }
  void setY(float y) { m_location.setY(y); }
  void setWidth(float width) { m_size.setWidth(width); }
  void setHeight(float height) { m_size.setHeight(height); }

  bool isEmpty() const { return m_size.isEmpty(); }
  bool isZero() const { return m_size.isZero(); }
  bool isExpressibleAsIntRect() const;

  FloatPoint center() const {
    return FloatPoint(x() + width() / 2, y() + height() / 2);
  }

  void move(const FloatSize& delta) { m_location += delta; }
  void moveBy(const FloatPoint& delta) {
    m_location.move(delta.x(), delta.y());
  }
  void move(float dx, float dy) { m_location.move(dx, dy); }

  void expand(const FloatSize& size) { m_size += size; }
  void expand(float dw, float dh) { m_size.expand(dw, dh); }
  void contract(const FloatSize& size) { m_size -= size; }
  void contract(float dw, float dh) { m_size.expand(-dw, -dh); }

  void shiftXEdgeTo(float edge) {
    float delta = edge - x();
    setX(edge);
    setWidth(std::max(0.0f, width() - delta));
  }
  void shiftMaxXEdgeTo(float edge) {
    float delta = edge - maxX();
    setWidth(std::max(0.0f, width() + delta));
  }
  void shiftYEdgeTo(float edge) {
    float delta = edge - y();
    setY(edge);
    setHeight(std::max(0.0f, height() - delta));
  }
  void shiftMaxYEdgeTo(float edge) {
    float delta = edge - maxY();
    setHeight(std::max(0.0f, height() + delta));
  }

  FloatPoint minXMinYCorner() const { return m_location; }  // typically topLeft
  FloatPoint maxXMinYCorner() const {
    return FloatPoint(m_location.x() + m_size.width(), m_location.y());
  }  // typically topRight
  FloatPoint minXMaxYCorner() const {
    return FloatPoint(m_location.x(), m_location.y() + m_size.height());
  }  // typically bottomLeft
  FloatPoint maxXMaxYCorner() const {
    return FloatPoint(m_location.x() + m_size.width(),
                      m_location.y() + m_size.height());
  }  // typically bottomRight

  bool intersects(const FloatRect&) const;
  bool contains(const FloatRect&) const;
  bool contains(const FloatPoint&, ContainsMode = InsideOrOnStroke) const;

  void intersect(const FloatRect&);
  void unite(const FloatRect&);
  void uniteEvenIfEmpty(const FloatRect&);
  void uniteIfNonZero(const FloatRect&);
  void extend(const FloatPoint&);

  // Note, this doesn't match what IntRect::contains(IntPoint&) does; the int
  // version is really checking for containment of 1x1 rect, but that doesn't
  // make sense with floats.
  bool contains(float px, float py) const {
    return px >= x() && px <= maxX() && py >= y() && py <= maxY();
  }

  void inflateX(float dx) {
    m_location.setX(m_location.x() - dx);
    m_size.setWidth(m_size.width() + dx + dx);
  }
  void inflateY(float dy) {
    m_location.setY(m_location.y() - dy);
    m_size.setHeight(m_size.height() + dy + dy);
  }
  void inflate(float d) {
    inflateX(d);
    inflateY(d);
  }
  void scale(float s) { scale(s, s); }
  void scale(float sx, float sy);

  FloatRect transposedRect() const {
    return FloatRect(m_location.transposedPoint(), m_size.transposedSize());
  }

  // Re-initializes this rectangle to fit the sets of passed points.
  void fitToPoints(const FloatPoint& p0, const FloatPoint& p1);
  void fitToPoints(const FloatPoint& p0,
                   const FloatPoint& p1,
                   const FloatPoint& p2);
  void fitToPoints(const FloatPoint& p0,
                   const FloatPoint& p1,
                   const FloatPoint& p2,
                   const FloatPoint& p3);

  operator SkRect() const {
    return SkRect::MakeXYWH(x(), y(), width(), height());
  }

 private:
  FloatPoint m_location;
  FloatSize m_size;

  void setLocationAndSizeFromEdges(float left,
                                   float top,
                                   float right,
                                   float bottom) {
    m_location.set(left, top);
    m_size.setWidth(right - left);
    m_size.setHeight(bottom - top);
  }
};

inline FloatRect intersection(const FloatRect& a, const FloatRect& b) {
  FloatRect c = a;
  c.intersect(b);
  return c;
}

inline FloatRect unionRect(const FloatRect& a, const FloatRect& b) {
  FloatRect c = a;
  c.unite(b);
  return c;
}

FloatRect unionRect(const Vector<FloatRect>&);

inline FloatRect& operator+=(FloatRect& a, const FloatRect& b) {
  a.move(b.x(), b.y());
  a.setWidth(a.width() + b.width());
  a.setHeight(a.height() + b.height());
  return a;
}

inline FloatRect operator+(const FloatRect& a, const FloatRect& b) {
  FloatRect c = a;
  c += b;
  return c;
}

inline bool operator==(const FloatRect& a, const FloatRect& b) {
  return a.location() == b.location() && a.size() == b.size();
}

inline bool operator!=(const FloatRect& a, const FloatRect& b) {
  return a.location() != b.location() || a.size() != b.size();
}

PLATFORM_EXPORT IntRect enclosingIntRect(const FloatRect&);

// Returns a valid IntRect contained within the given FloatRect.
PLATFORM_EXPORT IntRect enclosedIntRect(const FloatRect&);

PLATFORM_EXPORT IntRect roundedIntRect(const FloatRect&);

// Map supplied rect from srcRect to an equivalent rect in destRect.
PLATFORM_EXPORT FloatRect mapRect(const FloatRect&,
                                  const FloatRect& srcRect,
                                  const FloatRect& destRect);

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_FLOATRECT_H_