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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2008 by Sun Microsystems, Inc.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * $RCSfile: stridedarrayiterator.hxx,v $
+ * $Revision: 1.6 $
+ *
+ * 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 */