third_party/WebKit/Source/platform/graphics/paint/CullRect.h

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CullRect_h
#define CullRect_h

#include "platform/geometry/IntRect.h"
#include "platform/transforms/AffineTransform.h"
#include "wtf/Allocator.h"
#include "wtf/HashMap.h"
#include "wtf/ListHashSet.h"
#include "wtf/text/WTFString.h"

#include <limits>

namespace blink {

class FloatRect;
class LayoutRect;
class LayoutUnit;

class PLATFORM_EXPORT CullRect {
  DISALLOW_NEW();

 public:
  CullRect() {}
  explicit CullRect(const IntRect& rect) : m_rect(rect) {}
  CullRect(const CullRect&, const IntPoint& offset);
  CullRect(const CullRect&, const IntSize& offset);

  bool intersectsCullRect(const AffineTransform&,
                          const FloatRect& boundingBox) const;
  void updateCullRect(const AffineTransform& localToParentTransform);
  bool intersectsCullRect(const IntRect&) const;
  bool intersectsCullRect(const LayoutRect&) const;
  bool intersectsHorizontalRange(LayoutUnit lo, LayoutUnit hi) const;
  bool intersectsVerticalRange(LayoutUnit lo, LayoutUnit hi) const;

  String toString() const { return m_rect.toString(); }

 private:
  IntRect m_rect;

  friend bool operator==(const CullRect&, const CullRect&);

  // TODO(chrishtr): temporary while we implement CullRect everywhere.
  friend class FramePainter;
  friend class GridPainter;
  friend class SVGInlineTextBoxPainter;
  friend class SVGPaintContext;
  friend class SVGRootInlineBoxPainter;
  friend class SVGShapePainter;
  friend class TableSectionPainter;
  friend class ThemePainterMac;
  friend class WebPluginContainerImpl;
};

inline bool operator==(const CullRect& a, const CullRect& b) {
  return a.m_rect == b.m_rect;
}
inline bool operator!=(const CullRect& a, const CullRect& b) {
  return !(a == b);
}

}  // namespace blink

#endif  // CullRect_h