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Diffstat (limited to '')
| -rw-r--r-- | basegfx/source/range/b2xrange.cxx | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/basegfx/source/range/b2xrange.cxx b/basegfx/source/range/b2xrange.cxx new file mode 100644 index 000000000..3f04a95af --- /dev/null +++ b/basegfx/source/range/b2xrange.cxx @@ -0,0 +1,120 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <basegfx/range/b2drange.hxx> +#include <basegfx/range/b2irange.hxx> + +namespace basegfx +{ + namespace + { + /** Generic implementation of the difference set computation + + @tpl RangeType + Type to operate on. Must provide ValueType and TraitsType + nested types. + */ + template< class RangeType > void doComputeSetDifference( + std::vector< RangeType >& o_rRanges, + const RangeType& a, + const RangeType& b ) + { + o_rRanges.clear(); + + // special-casing the empty rect case (this will fail most + // of the times below, because of the DBL_MIN/MAX special + // values denoting emptiness in the rectangle. + if( a.isEmpty() ) + { + o_rRanges.push_back( b ); + return; + } + if( b.isEmpty() ) + { + o_rRanges.push_back( a ); + return; + } + + const typename RangeType::ValueType ax(a.getMinX()); + const typename RangeType::ValueType ay(a.getMinY()); + const typename RangeType::TraitsType::DifferenceType aw(a.getWidth()); + const typename RangeType::TraitsType::DifferenceType ah(a.getHeight()); + const typename RangeType::ValueType bx(b.getMinX()); + const typename RangeType::ValueType by(b.getMinY()); + const typename RangeType::TraitsType::DifferenceType bw(b.getWidth()); + const typename RangeType::TraitsType::DifferenceType bh(b.getHeight()); + + const typename RangeType::TraitsType::DifferenceType h0( (by > ay) ? by - ay : 0 ); + const typename RangeType::TraitsType::DifferenceType h3( (by + bh < ay + ah) ? ay + ah - by - bh : 0 ); + const typename RangeType::TraitsType::DifferenceType w1( (bx > ax) ? bx - ax : 0 ); + const typename RangeType::TraitsType::DifferenceType w2( (ax + aw > bx + bw) ? ax + aw - bx - bw : 0 ); + const typename RangeType::TraitsType::DifferenceType h12( (h0 + h3 < ah) ? ah - h0 - h3 : 0 ); + + // TODO(E2): Use numeric_cast instead of static_cast here, + // need range checks! + if (h0 > 0) + o_rRanges.push_back( + RangeType(ax,ay, + static_cast<typename RangeType::ValueType>(ax+aw), + static_cast<typename RangeType::ValueType>(ay+h0)) ); + + if (w1 > 0 && h12 > 0) + o_rRanges.push_back( + RangeType(ax, + static_cast<typename RangeType::ValueType>(ay+h0), + static_cast<typename RangeType::ValueType>(ax+w1), + static_cast<typename RangeType::ValueType>(ay+h0+h12)) ); + + if (w2 > 0 && h12 > 0) + o_rRanges.push_back( + RangeType(static_cast<typename RangeType::ValueType>(bx+bw), + static_cast<typename RangeType::ValueType>(ay+h0), + static_cast<typename RangeType::ValueType>(bx+bw+w2), + static_cast<typename RangeType::ValueType>(ay+h0+h12)) ); + + if (h3 > 0) + o_rRanges.push_back( + RangeType(ax, + static_cast<typename RangeType::ValueType>(ay+h0+h12), + static_cast<typename RangeType::ValueType>(ax+aw), + static_cast<typename RangeType::ValueType>(ay+h0+h12+h3)) ); + } + } + + std::vector< B2IRange >& computeSetDifference( std::vector< B2IRange >& o_rResult, + const B2IRange& rFirst, + const B2IRange& rSecond ) + { + doComputeSetDifference( o_rResult, rFirst, rSecond ); + + return o_rResult; + } + + std::vector< B2DRange >& computeSetDifference( std::vector< B2DRange >& o_rResult, + const B2DRange& rFirst, + const B2DRange& rSecond ) + { + doComputeSetDifference( o_rResult, rFirst, rSecond ); + + return o_rResult; + } + +} // end of namespace basegfx + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |