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+/*************************************************************************
+ *
+ * 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_SCALEIMAGE_HXX
+#define INCLUDED_BASEBMP_SCALEIMAGE_HXX
+
+#include <osl/diagnose.h>
+
+#include <vigra/tuple.hxx>
+#include <vigra/copyimage.hxx>
+#include <vigra/basicimage.hxx>
+#include <vigra/iteratortraits.hxx>
+
+namespace basebmp
+{
+
+template< class SourceIter, class SourceAcc,
+ class DestIter, class DestAcc >
+void scaleLine( SourceIter s_begin,
+ SourceIter s_end,
+ SourceAcc s_acc,
+ DestIter d_begin,
+ DestIter d_end,
+ DestAcc d_acc )
+{
+ const int src_width = s_end - s_begin;
+ const int dest_width = d_end - d_begin;
+
+ OSL_ASSERT( src_width > 0 && dest_width > 0 );
+
+ if( src_width >= dest_width )
+ {
+ // shrink
+ int rem = 0;
+ while( s_begin != s_end )
+ {
+ if( rem >= 0 )
+ {
+ d_acc.set( s_acc(s_begin), d_begin );
+
+ rem -= src_width;
+ ++d_begin;
+ }
+
+ rem += dest_width;
+ ++s_begin;
+ }
+ }
+ else
+ {
+ // enlarge
+ int rem = -dest_width;
+ while( d_begin != d_end )
+ {
+ if( rem >= 0 )
+ {
+ rem -= dest_width;
+ ++s_begin;
+ }
+
+ d_acc.set( s_acc(s_begin), d_begin );
+
+ rem += src_width;
+ ++d_begin;
+ }
+ }
+}
+
+/** Scale an image using zero order interpolation (pixel replication)
+
+ Source and destination range must be at least one pixel wide and
+ high.
+
+ @param s_begin
+ Start iterator for source image
+
+ @param s_end
+ End iterator for source image
+
+ @param s_acc
+ Source accessor
+
+ @param d_begin
+ Start iterator for destination image
+
+ @param d_end
+ End iterator for destination image
+
+ @param d_acc
+ Destination accessor
+
+ @param bMustCopy
+ When true, scaleImage always copies source, even when doing 1:1
+ copy
+ */
+template< class SourceIter, class SourceAcc,
+ class DestIter, class DestAcc >
+void scaleImage( SourceIter s_begin,
+ SourceIter s_end,
+ SourceAcc s_acc,
+ DestIter d_begin,
+ DestIter d_end,
+ DestAcc d_acc,
+ bool bMustCopy=false )
+{
+ const int src_width ( s_end.x - s_begin.x );
+ const int src_height( s_end.y - s_begin.y );
+
+ const int dest_width ( d_end.x - d_begin.x );
+ const int dest_height( d_end.y - d_begin.y );
+
+ if( !bMustCopy &&
+ src_width == dest_width &&
+ src_height == dest_height )
+ {
+ // no scaling involved, can simply copy
+ vigra::copyImage( s_begin, s_end, s_acc,
+ d_begin, d_acc );
+ return;
+ }
+
+ typedef vigra::BasicImage<typename SourceAcc::value_type> TmpImage;
+ typedef typename TmpImage::traverser TmpImageIter;
+
+ TmpImage tmp_image(src_width,
+ dest_height);
+ TmpImageIter t_begin = tmp_image.upperLeft();
+
+ // scale in y direction
+ for( int x=0; x<src_width; ++x, ++s_begin.x, ++t_begin.x )
+ {
+ typename SourceIter::column_iterator s_cbegin = s_begin.columnIterator();
+ typename TmpImageIter::column_iterator t_cbegin = t_begin.columnIterator();
+
+ scaleLine(s_cbegin, s_cbegin+src_height, s_acc,
+ t_cbegin, t_cbegin+dest_height, tmp_image.accessor());
+ }
+
+ t_begin = tmp_image.upperLeft();
+
+ // scale in x direction
+ for( int y=0; y<dest_height; ++y, ++d_begin.y, ++t_begin.y )
+ {
+ typename DestIter::row_iterator d_rbegin = d_begin.rowIterator();
+ typename TmpImageIter::row_iterator t_rbegin = t_begin.rowIterator();
+
+ scaleLine(t_rbegin, t_rbegin+src_width, tmp_image.accessor(),
+ d_rbegin, d_rbegin+dest_width, d_acc);
+ }
+}
+
+/** Scale an image, range tuple version
+
+ @param bMustCopy
+ When true, scaleImage always copies source, even when doing 1:1
+ copy
+ */
+template< class SourceIter, class SourceAcc,
+ class DestIter, class DestAcc >
+inline void scaleImage( vigra::triple<SourceIter,SourceIter,SourceAcc> const& src,
+ vigra::triple<DestIter,DestIter,DestAcc> const& dst,
+ bool bMustCopy=false )
+{
+ scaleImage(src.first,src.second,src.third,
+ dst.first,dst.second,dst.third,
+ bMustCopy);
+}
+
+}
+
+#endif /* INCLUDED_BASEBMP_SCALEIMAGE_HXX */