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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_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 */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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