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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 : namespace basegfx
25 : {
26 : namespace
27 : {
28 : /** Generic implementation of the difference set computation
29 :
30 : @tpl RangeType
31 : Type to operate on. Must provide ValueType and TraitsType
32 : nested types.
33 : */
34 0 : template< class RangeType > void doComputeSetDifference(
35 : ::std::vector< RangeType >& o_rRanges,
36 : const RangeType& a,
37 : const RangeType& b )
38 : {
39 0 : o_rRanges.clear();
40 :
41 : // special-casing the empty rect case (this will fail most
42 : // of the times below, because of the DBL_MIN/MAX special
43 : // values denoting emptiness in the rectangle.
44 0 : if( a.isEmpty() )
45 : {
46 0 : o_rRanges.push_back( b );
47 0 : return;
48 : }
49 0 : if( b.isEmpty() )
50 : {
51 0 : o_rRanges.push_back( a );
52 0 : return;
53 : }
54 :
55 0 : const typename RangeType::ValueType ax(a.getMinX());
56 0 : const typename RangeType::ValueType ay(a.getMinY());
57 0 : const typename RangeType::TraitsType::DifferenceType aw(a.getWidth());
58 0 : const typename RangeType::TraitsType::DifferenceType ah(a.getHeight());
59 0 : const typename RangeType::ValueType bx(b.getMinX());
60 0 : const typename RangeType::ValueType by(b.getMinY());
61 0 : const typename RangeType::TraitsType::DifferenceType bw(b.getWidth());
62 0 : const typename RangeType::TraitsType::DifferenceType bh(b.getHeight());
63 :
64 0 : const typename RangeType::TraitsType::DifferenceType h0( (by > ay) ? by - ay : 0 );
65 0 : const typename RangeType::TraitsType::DifferenceType h3( (by + bh < ay + ah) ? ay + ah - by - bh : 0 );
66 0 : const typename RangeType::TraitsType::DifferenceType w1( (bx > ax) ? bx - ax : 0 );
67 0 : const typename RangeType::TraitsType::DifferenceType w2( (ax + aw > bx + bw) ? ax + aw - bx - bw : 0 );
68 0 : const typename RangeType::TraitsType::DifferenceType h12( (h0 + h3 < ah) ? ah - h0 - h3 : 0 );
69 :
70 : // TODO(E2): Use numeric_cast instead of static_cast here,
71 : // need range checks!
72 0 : if (h0 > 0)
73 0 : o_rRanges.push_back(
74 : RangeType(ax,ay,
75 : static_cast<typename RangeType::ValueType>(ax+aw),
76 : static_cast<typename RangeType::ValueType>(ay+h0)) );
77 :
78 0 : if (w1 > 0 && h12 > 0)
79 0 : o_rRanges.push_back(
80 : RangeType(ax,
81 : static_cast<typename RangeType::ValueType>(ay+h0),
82 : static_cast<typename RangeType::ValueType>(ax+w1),
83 : static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
84 :
85 0 : if (w2 > 0 && h12 > 0)
86 0 : o_rRanges.push_back(
87 : RangeType(static_cast<typename RangeType::ValueType>(bx+bw),
88 : static_cast<typename RangeType::ValueType>(ay+h0),
89 : static_cast<typename RangeType::ValueType>(bx+bw+w2),
90 : static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
91 :
92 0 : if (h3 > 0)
93 0 : o_rRanges.push_back(
94 : RangeType(ax,
95 : static_cast<typename RangeType::ValueType>(ay+h0+h12),
96 : static_cast<typename RangeType::ValueType>(ax+aw),
97 : static_cast<typename RangeType::ValueType>(ay+h0+h12+h3)) );
98 : }
99 : }
100 :
101 0 : ::std::vector< B2IRange >& computeSetDifference( ::std::vector< B2IRange >& o_rResult,
102 : const B2IRange& rFirst,
103 : const B2IRange& rSecond )
104 : {
105 0 : doComputeSetDifference( o_rResult, rFirst, rSecond );
106 :
107 0 : return o_rResult;
108 : }
109 :
110 0 : ::std::vector< B2DRange >& computeSetDifference( ::std::vector< B2DRange >& o_rResult,
111 : const B2DRange& rFirst,
112 : const B2DRange& rSecond )
113 : {
114 0 : doComputeSetDifference( o_rResult, rFirst, rSecond );
115 :
116 0 : return o_rResult;
117 : }
118 :
119 : } // end of namespace basegfx
120 :
121 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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