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

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

#include "flutter/sky/engine/platform/geometry/FloatRect.h"
#include "flutter/sky/engine/platform/geometry/LayoutRect.h"
#include "third_party/skia/include/core/SkRect.h"

#include <algorithm>

namespace blink {

IntRect::IntRect(const FloatRect& r)
    : m_location(clampToInteger(r.x()), clampToInteger(r.y())),
      m_size(clampToInteger(r.width()), clampToInteger(r.height())) {}

IntRect::IntRect(const LayoutRect& r)
    : m_location(r.x(), r.y()), m_size(r.width(), r.height()) {}

bool IntRect::intersects(const IntRect& other) const {
  // Checking emptiness handles negative widths as well as zero.
  return !isEmpty() && !other.isEmpty() && x() < other.maxX() &&
         other.x() < maxX() && y() < other.maxY() && other.y() < maxY();
}

bool IntRect::contains(const IntRect& other) const {
  return x() <= other.x() && maxX() >= other.maxX() && y() <= other.y() &&
         maxY() >= other.maxY();
}

void IntRect::intersect(const IntRect& other) {
  int left = std::max(x(), other.x());
  int top = std::max(y(), other.y());
  int right = std::min(maxX(), other.maxX());
  int bottom = std::min(maxY(), other.maxY());

  // Return a clean empty rectangle for non-intersecting cases.
  if (left >= right || top >= bottom) {
    left = 0;
    top = 0;
    right = 0;
    bottom = 0;
  }

  m_location.setX(left);
  m_location.setY(top);
  m_size.setWidth(right - left);
  m_size.setHeight(bottom - top);
}

void IntRect::unite(const IntRect& other) {
  // Handle empty special cases first.
  if (other.isEmpty())
    return;
  if (isEmpty()) {
    *this = other;
    return;
  }

  int left = std::min(x(), other.x());
  int top = std::min(y(), other.y());
  int right = std::max(maxX(), other.maxX());
  int bottom = std::max(maxY(), other.maxY());

  m_location.setX(left);
  m_location.setY(top);
  m_size.setWidth(right - left);
  m_size.setHeight(bottom - top);
}

void IntRect::uniteIfNonZero(const IntRect& other) {
  // Handle empty special cases first.
  if (!other.width() && !other.height())
    return;
  if (!width() && !height()) {
    *this = other;
    return;
  }

  int left = std::min(x(), other.x());
  int top = std::min(y(), other.y());
  int right = std::max(maxX(), other.maxX());
  int bottom = std::max(maxY(), other.maxY());

  m_location.setX(left);
  m_location.setY(top);
  m_size.setWidth(right - left);
  m_size.setHeight(bottom - top);
}

void IntRect::scale(float s) {
  m_location.setX((int)(x() * s));
  m_location.setY((int)(y() * s));
  m_size.setWidth((int)(width() * s));
  m_size.setHeight((int)(height() * s));
}

static inline int distanceToInterval(int pos, int start, int end) {
  if (pos < start)
    return start - pos;
  if (pos > end)
    return end - pos;
  return 0;
}

IntSize IntRect::differenceToPoint(const IntPoint& point) const {
  int xdistance = distanceToInterval(point.x(), x(), maxX());
  int ydistance = distanceToInterval(point.y(), y(), maxY());
  return IntSize(xdistance, ydistance);
}

IntRect::operator SkIRect() const {
  SkIRect rect = {x(), y(), maxX(), maxY()};
  return rect;
}

IntRect::operator SkRect() const {
  SkRect rect;
  rect.set(SkIntToScalar(x()), SkIntToScalar(y()), SkIntToScalar(maxX()),
           SkIntToScalar(maxY()));
  return rect;
}

IntRect unionRect(const Vector<IntRect>& rects) {
  IntRect result;

  size_t count = rects.size();
  for (size_t i = 0; i < count; ++i)
    result.unite(rects[i]);

  return result;
}

#ifndef NDEBUG
// Prints the rect to the screen.
void IntRect::show() const {
  LayoutRect(*this).show();
}
#endif

}  // namespace blink