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

/*
 * Copyright (C) 2003, 2006, 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer in the
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_INTRECT_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_INTRECT_H_

#include "flutter/sky/engine/platform/geometry/IntPoint.h"
#include "flutter/sky/engine/wtf/FastAllocBase.h"
#include "flutter/sky/engine/wtf/Vector.h"
#include "flutter/sky/engine/wtf/VectorTraits.h"

struct SkRect;
struct SkIRect;

namespace blink {

class FloatRect;
class LayoutRect;

class PLATFORM_EXPORT IntRect {
  WTF_MAKE_FAST_ALLOCATED;

 public:
  IntRect() {}
  IntRect(const IntPoint& location, const IntSize& size)
      : m_location(location), m_size(size) {}
  IntRect(int x, int y, int width, int height)
      : m_location(IntPoint(x, y)), m_size(IntSize(width, height)) {}

  explicit IntRect(
      const FloatRect&);  // don't do this implicitly since it's lossy
  explicit IntRect(
      const LayoutRect&);  // don't do this implicitly since it's lossy

  IntPoint location() const { return m_location; }
  IntSize size() const { return m_size; }

  void setLocation(const IntPoint& location) { m_location = location; }
  void setSize(const IntSize& size) { m_size = size; }

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

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

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

  // NOTE: The result is rounded to integer values, and thus may be not the
  // exact center point.
  IntPoint center() const {
    return IntPoint(x() + width() / 2, y() + height() / 2);
  }

  void move(const IntSize& size) { m_location += size; }
  void moveBy(const IntPoint& offset) {
    m_location.move(offset.x(), offset.y());
  }
  void move(int dx, int dy) { m_location.move(dx, dy); }

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

  void shiftXEdgeTo(int edge) {
    int delta = edge - x();
    setX(edge);
    setWidth(std::max(0, width() - delta));
  }
  void shiftMaxXEdgeTo(int edge) {
    int delta = edge - maxX();
    setWidth(std::max(0, width() + delta));
  }
  void shiftYEdgeTo(int edge) {
    int delta = edge - y();
    setY(edge);
    setHeight(std::max(0, height() - delta));
  }
  void shiftMaxYEdgeTo(int edge) {
    int delta = edge - maxY();
    setHeight(std::max(0, height() + delta));
  }

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

  bool intersects(const IntRect&) const;
  bool contains(const IntRect&) const;

  // This checks to see if the rect contains x,y in the traditional sense.
  // Equivalent to checking if the rect contains a 1x1 rect below and to the
  // right of (px,py).
  bool contains(int px, int py) const {
    return px >= x() && px < maxX() && py >= y() && py < maxY();
  }
  bool contains(const IntPoint& point) const {
    return contains(point.x(), point.y());
  }

  void intersect(const IntRect&);
  void unite(const IntRect&);
  void uniteIfNonZero(const IntRect&);

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

  IntSize differenceToPoint(const IntPoint&) const;
  int distanceSquaredToPoint(const IntPoint& p) const {
    return differenceToPoint(p).diagonalLengthSquared();
  }

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

  operator SkRect() const;
  operator SkIRect() const;

#ifndef NDEBUG
  // Prints the rect to the screen.
  void show() const;
#endif

 private:
  IntPoint m_location;
  IntSize m_size;
};

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

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

PLATFORM_EXPORT IntRect unionRect(const Vector<IntRect>&);

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

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

}  // namespace blink

WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::IntRect);

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_INTRECT_H_