1 /* 2 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 27 * OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef ShapeInterval_h 31 #define ShapeInterval_h 32 33 #include "wtf/Vector.h" 34 35 namespace blink { 36 37 template <typename T> 38 class ShapeInterval { 39 WTF_MAKE_FAST_ALLOCATED; 40 public: 41 ShapeInterval() 42 : m_x1(-1) 43 , m_x2(-2) 44 { 45 // The initial values of m_x1,x2 don't matter (unless you're looking 46 // at them in the debugger) so long as isUndefined() is true. 47 ASSERT(isUndefined()); 48 } 49 50 ShapeInterval(T x1, T x2) 51 : m_x1(x1) 52 , m_x2(x2) 53 { 54 ASSERT(x2 >= x1); 55 } 56 57 bool isUndefined() const { return m_x2 < m_x1; } 58 T x1() const { return isUndefined() ? 0 : m_x1; } 59 T x2() const { return isUndefined() ? 0 : m_x2; } 60 T width() const { return isUndefined() ? 0 : m_x2 - m_x1; } 61 bool isEmpty() const { return isUndefined() ? true : m_x1 == m_x2; } 62 63 void set(T x1, T x2) 64 { 65 ASSERT(x2 >= x1); 66 m_x1 = x1; 67 m_x2 = x2; 68 } 69 70 bool overlaps(const ShapeInterval<T>& interval) const 71 { 72 if (isUndefined() || interval.isUndefined()) 73 return false; 74 return x2() >= interval.x1() && x1() <= interval.x2(); 75 } 76 77 bool contains(const ShapeInterval<T>& interval) const 78 { 79 if (isUndefined() || interval.isUndefined()) 80 return false; 81 return x1() <= interval.x1() && x2() >= interval.x2(); 82 } 83 84 bool operator==(const ShapeInterval<T>& other) const { return x1() == other.x1() && x2() == other.x2(); } 85 bool operator!=(const ShapeInterval<T>& other) const { return !operator==(other); } 86 87 void unite(const ShapeInterval<T>& interval) 88 { 89 if (interval.isUndefined()) 90 return; 91 if (isUndefined()) 92 set(interval.x1(), interval.x2()); 93 else 94 set(std::min<T>(x1(), interval.x1()), std::max<T>(x2(), interval.x2())); 95 } 96 97 private: 98 T m_x1; 99 T m_x2; 100 }; 101 102 typedef ShapeInterval<int> IntShapeInterval; 103 typedef ShapeInterval<float> FloatShapeInterval; 104 105 typedef Vector<IntShapeInterval> IntShapeIntervals; 106 typedef Vector<FloatShapeInterval> FloatShapeIntervals; 107 108 } // namespace blink 109 110 #endif // ShapeInterval_h 111
