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

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

#include <stdio.h>
#include <algorithm>
#include "flutter/sky/engine/platform/LayoutUnit.h"
#include "flutter/sky/engine/platform/geometry/FloatRect.h"

namespace blink {

LayoutRect::LayoutRect(const FloatRect& 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(0, 0);
    newMaxPoint = LayoutPoint(0, 0);
  }

  m_location = newLocation;
  m_size = newMaxPoint - newLocation;
}

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

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

  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);
}

#ifndef NDEBUG
void LayoutRect::show(bool showRawValue) const {
  if (showRawValue)
    printf("Rect (in raw layout units): [x=%d y=%d maxX=%d maxY=%d]\n",
           x().rawValue(), y().rawValue(), maxX().rawValue(),
           maxY().rawValue());
  else
    printf("Rect (in pixels): [x=%lf y=%lf maxX=%lf maxY=%lf]\n",
           x().toDouble(), y().toDouble(), maxX().toDouble(),
           maxY().toDouble());
}
#endif

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;
}

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);
}

}  // namespace blink