third_party/WebKit/Source/platform/geometry/LayoutRect.cpp

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#include "platform/geometry/LayoutRect.h"

#include "platform/LayoutUnit.h"
#include "platform/geometry/DoubleRect.h"
#include "platform/geometry/FloatRect.h"
#include "wtf/text/WTFString.h"
#include <algorithm>
#include <stdio.h>

namespace blink {

LayoutRect::LayoutRect(const FloatRect& r)
    : m_location(LayoutPoint(r.location())), m_size(LayoutSize(r.size())) {}

LayoutRect::LayoutRect(const DoubleRect& r)
    : m_location(LayoutPoint(r.location())), m_size(LayoutSize(r.size())) {}

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

void LayoutRect::intersect(const LayoutRect& other) {
  LayoutPoint newLocation(std::max(x(), other.x()), std::max(y(), other.y()));
  LayoutPoint newMaxPoint(std::min(maxX(), other.maxX()),
                          std::min(maxY(), other.maxY()));

  // Return a clean empty rectangle for non-intersecting cases.
  if (newLocation.x() >= newMaxPoint.x() ||
      newLocation.y() >= newMaxPoint.y()) {
    newLocation = LayoutPoint();
    newMaxPoint = LayoutPoint();
  }

  m_location = newLocation;
  m_size = newMaxPoint - newLocation;
}

bool LayoutRect::inclusiveIntersect(const LayoutRect& other) {
  LayoutPoint newLocation(std::max(x(), other.x()), std::max(y(), other.y()));
  LayoutPoint newMaxPoint(std::min(maxX(), other.maxX()),
                          std::min(maxY(), other.maxY()));

  if (newLocation.x() > newMaxPoint.x() || newLocation.y() > newMaxPoint.y()) {
    *this = LayoutRect();
    return false;
  }

  m_location = newLocation;
  m_size = newMaxPoint - newLocation;
  return true;
}

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

  uniteEvenIfEmpty(other);
}

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

  uniteEvenIfEmpty(other);
}

void LayoutRect::uniteEvenIfEmpty(const LayoutRect& other) {
  LayoutPoint newLocation(std::min(x(), other.x()), std::min(y(), other.y()));
  LayoutPoint newMaxPoint(std::max(maxX(), other.maxX()),
                          std::max(maxY(), other.maxY()));

  m_location = newLocation;
  m_size = newMaxPoint - newLocation;
}

void LayoutRect::scale(float s) {
  m_location.scale(s, s);
  m_size.scale(s);
}

void LayoutRect::scale(float xAxisScale, float yAxisScale) {
  m_location.scale(xAxisScale, yAxisScale);
  m_size.scale(xAxisScale, yAxisScale);
}

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

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

  return result;
}

LayoutRect unionRectEvenIfEmpty(const Vector<LayoutRect>& rects) {
  size_t count = rects.size();
  if (!count)
    return LayoutRect();

  LayoutRect result = rects[0];
  for (size_t i = 1; i < count; ++i)
    result.uniteEvenIfEmpty(rects[i]);

  return result;
}

IntRect enclosingIntRect(const LayoutRect& rect) {
  IntPoint location = flooredIntPoint(rect.minXMinYCorner());
  IntPoint maxPoint = ceiledIntPoint(rect.maxXMaxYCorner());

  return IntRect(location, maxPoint - location);
}

LayoutRect enclosingLayoutRect(const FloatRect& rect) {
  LayoutPoint location = flooredLayoutPoint(rect.minXMinYCorner());
  LayoutPoint maxPoint = ceiledLayoutPoint(rect.maxXMaxYCorner());
  return LayoutRect(location, maxPoint - location);
}

String LayoutRect::toString() const {
  return String::format("%s %s", location().toString().ascii().data(),
                        size().toString().ascii().data());
}

}  // namespace blink