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Diffstat (limited to 'basebmp/inc/basebmp/stridedarrayiterator.hxx')
-rw-r--r-- | basebmp/inc/basebmp/stridedarrayiterator.hxx | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/basebmp/inc/basebmp/stridedarrayiterator.hxx b/basebmp/inc/basebmp/stridedarrayiterator.hxx new file mode 100644 index 000000000000..8139cc8a8bc9 --- /dev/null +++ b/basebmp/inc/basebmp/stridedarrayiterator.hxx @@ -0,0 +1,114 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#ifndef INCLUDED_BASEBMP_STRIDEDARRAYITERATOR_HXX +#define INCLUDED_BASEBMP_STRIDEDARRAYITERATOR_HXX + +#include <basebmp/metafunctions.hxx> + +namespace basebmp +{ + +/** Like vigra::StridedArrayIterator + + Changed semantics re. DirectionSelector<StridedArrayTag>: stride + now counts in <em>raw</em> bytes + + Adapts given ptr, in a way that iterator increments move forward + in strided steps. Stride can, by the way, also be negative + */ +template< typename T > class StridedArrayIterator +{ +public: + typedef typename clone_const<T, unsigned char>::type internal_type; + + /** Create iterator + + @param stride + + Stride in bytes. Given value should better match memory layout + of T, as memory gets reinterpret-casted. + */ + explicit StridedArrayIterator(int stride, T* ptr = 0) : + stride_(stride), + current_(reinterpret_cast<internal_type*>(ptr)) + {} + + /** Copy from other StridedArrayIterator, plus given offset + + @param offset + Offset in bytes + */ + StridedArrayIterator( StridedArrayIterator const& rSrc, + int offset ) : + stride_(rSrc.stride_), + current_(reinterpret_cast<internal_type*>( + reinterpret_cast<T*>(rSrc.current_)+offset)) + {} + + void operator++() {current_ += stride_; } + void operator++(int) {current_ += stride_; } + void operator--() {current_ -= stride_; } + void operator--(int) {current_ -= stride_; } + void operator+=(int dy) {current_ += dy*stride_; } + void operator-=(int dy) {current_ -= dy*stride_; } + + int operator-(StridedArrayIterator const & rhs) const + { return (current_ - rhs.current_) / stride_; } + + bool operator==(StridedArrayIterator const & rhs) const + { return current_ == rhs.current_; } + + bool operator!=(StridedArrayIterator const & rhs) const + { return current_ != rhs.current_; } + + bool operator<(StridedArrayIterator const & rhs) const + { return *this - rhs < 0; } + + bool operator<=(StridedArrayIterator const & rhs) const + { return *this - rhs <= 0; } + + bool operator>(StridedArrayIterator const & rhs) const + { return *this - rhs > 0; } + + bool operator>=(StridedArrayIterator const & rhs) const + { return *this - rhs >= 0; } + + T* operator()() const + { return reinterpret_cast<T*>(current_); } + + T* operator()(int d) const + { return reinterpret_cast<T*>(current_ + d*stride_); } + +private: + int stride_; + internal_type* current_; +}; + +} // namespace basebmp + +#endif /* INCLUDED_BASEBMP_STRIDEDARRAYITERATOR_HXX */ |