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/* -*- 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 .
*/
#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 */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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