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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 : #include <basegfx/range/b2drange.hxx>
21 : #include <basegfx/range/b2irange.hxx>
22 : #include <basegfx/range/b2ibox.hxx>
23 :
24 :
25 : namespace basegfx
26 : {
27 : namespace
28 : {
29 : /** Generic implementation of the difference set computation
30 :
31 : @tpl RangeType
32 : Type to operate on. Must provide ValueType and TraitsType
33 : nested types.
34 : */
35 0 : template< class RangeType > void doComputeSetDifference(
36 : ::std::vector< RangeType >& o_rRanges,
37 : const RangeType& a,
38 : const RangeType& b )
39 : {
40 0 : o_rRanges.clear();
41 :
42 : // special-casing the empty rect case (this will fail most
43 : // of the times below, because of the DBL_MIN/MAX special
44 : // values denoting emptiness in the rectangle.
45 0 : if( a.isEmpty() )
46 : {
47 0 : o_rRanges.push_back( b );
48 0 : return;
49 : }
50 0 : if( b.isEmpty() )
51 : {
52 0 : o_rRanges.push_back( a );
53 0 : return;
54 : }
55 :
56 0 : const typename RangeType::ValueType ax(a.getMinX());
57 0 : const typename RangeType::ValueType ay(a.getMinY());
58 0 : const typename RangeType::TraitsType::DifferenceType aw(a.getWidth());
59 0 : const typename RangeType::TraitsType::DifferenceType ah(a.getHeight());
60 0 : const typename RangeType::ValueType bx(b.getMinX());
61 0 : const typename RangeType::ValueType by(b.getMinY());
62 0 : const typename RangeType::TraitsType::DifferenceType bw(b.getWidth());
63 0 : const typename RangeType::TraitsType::DifferenceType bh(b.getHeight());
64 :
65 0 : const typename RangeType::TraitsType::DifferenceType h0( (by > ay) ? by - ay : 0 );
66 0 : const typename RangeType::TraitsType::DifferenceType h3( (by + bh < ay + ah) ? ay + ah - by - bh : 0 );
67 0 : const typename RangeType::TraitsType::DifferenceType w1( (bx > ax) ? bx - ax : 0 );
68 0 : const typename RangeType::TraitsType::DifferenceType w2( (ax + aw > bx + bw) ? ax + aw - bx - bw : 0 );
69 0 : const typename RangeType::TraitsType::DifferenceType h12( (h0 + h3 < ah) ? ah - h0 - h3 : 0 );
70 :
71 : // TODO(E2): Use numeric_cast instead of static_cast here,
72 : // need range checks!
73 0 : if (h0 > 0)
74 0 : o_rRanges.push_back(
75 : RangeType(ax,ay,
76 : static_cast<typename RangeType::ValueType>(ax+aw),
77 : static_cast<typename RangeType::ValueType>(ay+h0)) );
78 :
79 0 : if (w1 > 0 && h12 > 0)
80 0 : o_rRanges.push_back(
81 : RangeType(ax,
82 : static_cast<typename RangeType::ValueType>(ay+h0),
83 : static_cast<typename RangeType::ValueType>(ax+w1),
84 : static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
85 :
86 0 : if (w2 > 0 && h12 > 0)
87 0 : o_rRanges.push_back(
88 : RangeType(static_cast<typename RangeType::ValueType>(bx+bw),
89 : static_cast<typename RangeType::ValueType>(ay+h0),
90 : static_cast<typename RangeType::ValueType>(bx+bw+w2),
91 : static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
92 :
93 0 : if (h3 > 0)
94 0 : o_rRanges.push_back(
95 : RangeType(ax,
96 : static_cast<typename RangeType::ValueType>(ay+h0+h12),
97 : static_cast<typename RangeType::ValueType>(ax+aw),
98 : static_cast<typename RangeType::ValueType>(ay+h0+h12+h3)) );
99 : }
100 : }
101 :
102 0 : ::std::vector< B2IRange >& computeSetDifference( ::std::vector< B2IRange >& o_rResult,
103 : const B2IRange& rFirst,
104 : const B2IRange& rSecond )
105 : {
106 0 : doComputeSetDifference( o_rResult, rFirst, rSecond );
107 :
108 0 : return o_rResult;
109 : }
110 :
111 0 : ::std::vector< B2DRange >& computeSetDifference( ::std::vector< B2DRange >& o_rResult,
112 : const B2DRange& rFirst,
113 : const B2DRange& rSecond )
114 : {
115 0 : doComputeSetDifference( o_rResult, rFirst, rSecond );
116 :
117 0 : return o_rResult;
118 : }
119 :
120 : } // end of namespace basegfx
121 :
122 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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