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32 #include "FloatPoint.h"
33 #include "FloatRect.h"
38 // A FloatQuad is a collection of 4 points, often representing the result of
39 // mapping a rectangle through transforms. When initialized from a rect, the
40 // points are in clockwise order from top left.
47 FloatQuad(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& p3, const FloatPoint& p4)
55 FloatQuad(const FloatRect& inRect)
56 : m_p1(inRect.location())
57 , m_p2(inRect.maxX(), inRect.y())
58 , m_p3(inRect.maxX(), inRect.maxY())
59 , m_p4(inRect.x(), inRect.maxY())
63 FloatPoint p1() const { return m_p1; }
64 FloatPoint p2() const { return m_p2; }
65 FloatPoint p3() const { return m_p3; }
66 FloatPoint p4() const { return m_p4; }
68 void setP1(const FloatPoint& p) { m_p1 = p; }
69 void setP2(const FloatPoint& p) { m_p2 = p; }
70 void setP3(const FloatPoint& p) { m_p3 = p; }
71 void setP4(const FloatPoint& p) { m_p4 = p; }
73 // isEmpty tests that the bounding box is empty. This will not identify
74 // "slanted" empty quads.
75 bool isEmpty() const { return boundingBox().isEmpty(); }
77 // Tests whether this quad can be losslessly represented by a FloatRect,
78 // that is, if two edges are parallel to the x-axis and the other two
79 // are parallel to the y-axis. If this method returns true, the
80 // corresponding FloatRect can be retrieved with boundingBox().
81 bool isRectilinear() const;
83 // Tests whether the given point is inside, or on an edge or corner of this quad.
84 bool containsPoint(const FloatPoint&) const;
86 // Tests whether the four corners of other are inside, or coincident with the sides of this quad.
87 // Note that this only works for convex quads, but that includes all quads that originate
88 // from transformed rects.
89 bool containsQuad(const FloatQuad&) const;
91 FloatRect boundingBox() const;
92 IntRect enclosingBoundingBox() const
94 return enclosingIntRect(boundingBox());
97 void move(const FloatSize& offset)
105 void move(float dx, float dy)
120 inline FloatQuad& operator+=(FloatQuad& a, const FloatSize& b)
126 inline FloatQuad& operator-=(FloatQuad& a, const FloatSize& b)
128 a.move(-b.width(), -b.height());
132 inline bool operator==(const FloatQuad& a, const FloatQuad& b)
134 return a.p1() == b.p1() &&
140 inline bool operator!=(const FloatQuad& a, const FloatQuad& b)
142 return a.p1() != b.p1() ||
148 } // namespace WebCore
151 #endif // FloatQuad_h