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| 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==(ot
her); } | |
| 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 | |
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