121 lines
5.4 KiB
C++
121 lines
5.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <basegfx/range/b2drange.hxx>
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#include <basegfx/range/b2irange.hxx>
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#include <basegfx/range/b2ibox.hxx>
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namespace basegfx
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{
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namespace
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{
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/** Generic implementation of the difference set computation
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@tpl RangeType
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Type to operate on. Must provide ValueType and TraitsType
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nested types.
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*/
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template< class RangeType > void doComputeSetDifference(
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::std::vector< RangeType >& o_rRanges,
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const RangeType& a,
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const RangeType& b )
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{
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o_rRanges.clear();
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// special-casing the empty rect case (this will fail most
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// of the times below, because of the DBL_MIN/MAX special
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// values denoting emptiness in the rectangle.
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if( a.isEmpty() )
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{
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o_rRanges.push_back( b );
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return;
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}
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if( b.isEmpty() )
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{
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o_rRanges.push_back( a );
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return;
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}
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const typename RangeType::ValueType ax(a.getMinX());
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const typename RangeType::ValueType ay(a.getMinY());
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const typename RangeType::TraitsType::DifferenceType aw(a.getWidth());
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const typename RangeType::TraitsType::DifferenceType ah(a.getHeight());
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const typename RangeType::ValueType bx(b.getMinX());
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const typename RangeType::ValueType by(b.getMinY());
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const typename RangeType::TraitsType::DifferenceType bw(b.getWidth());
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const typename RangeType::TraitsType::DifferenceType bh(b.getHeight());
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const typename RangeType::TraitsType::DifferenceType h0( (by > ay) ? by - ay : 0 );
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const typename RangeType::TraitsType::DifferenceType h3( (by + bh < ay + ah) ? ay + ah - by - bh : 0 );
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const typename RangeType::TraitsType::DifferenceType w1( (bx > ax) ? bx - ax : 0 );
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const typename RangeType::TraitsType::DifferenceType w2( (ax + aw > bx + bw) ? ax + aw - bx - bw : 0 );
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const typename RangeType::TraitsType::DifferenceType h12( (h0 + h3 < ah) ? ah - h0 - h3 : 0 );
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// TODO(E2): Use numeric_cast instead of static_cast here,
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// need range checks!
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if (h0 > 0)
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o_rRanges.push_back(
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RangeType(ax,ay,
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static_cast<typename RangeType::ValueType>(ax+aw),
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static_cast<typename RangeType::ValueType>(ay+h0)) );
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if (w1 > 0 && h12 > 0)
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o_rRanges.push_back(
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RangeType(ax,
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static_cast<typename RangeType::ValueType>(ay+h0),
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static_cast<typename RangeType::ValueType>(ax+w1),
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static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
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if (w2 > 0 && h12 > 0)
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o_rRanges.push_back(
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RangeType(static_cast<typename RangeType::ValueType>(bx+bw),
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static_cast<typename RangeType::ValueType>(ay+h0),
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static_cast<typename RangeType::ValueType>(bx+bw+w2),
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static_cast<typename RangeType::ValueType>(ay+h0+h12)) );
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if (h3 > 0)
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o_rRanges.push_back(
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RangeType(ax,
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static_cast<typename RangeType::ValueType>(ay+h0+h12),
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static_cast<typename RangeType::ValueType>(ax+aw),
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static_cast<typename RangeType::ValueType>(ay+h0+h12+h3)) );
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}
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}
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::std::vector< B2IRange >& computeSetDifference( ::std::vector< B2IRange >& o_rResult,
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const B2IRange& rFirst,
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const B2IRange& rSecond )
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{
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doComputeSetDifference( o_rResult, rFirst, rSecond );
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return o_rResult;
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}
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::std::vector< B2DRange >& computeSetDifference( ::std::vector< B2DRange >& o_rResult,
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const B2DRange& rFirst,
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const B2DRange& rSecond )
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{
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doComputeSetDifference( o_rResult, rFirst, rSecond );
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return o_rResult;
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}
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} // end of namespace basegfx
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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