LCOV - code coverage report
Current view: top level - include/basebmp - scaleimage.hxx (source / functions) Hit Total Coverage
Test: commit c8344322a7af75b84dd3ca8f78b05543a976dfd5 Lines: 48 48 100.0 %
Date: 2015-06-13 12:38:46 Functions: 37 698 5.3 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_BASEBMP_SCALEIMAGE_HXX
      21             : #define INCLUDED_BASEBMP_SCALEIMAGE_HXX
      22             : 
      23             : #include <osl/diagnose.h>
      24             : 
      25             : #include <vigra/tuple.hxx>
      26             : #include <vigra/copyimage.hxx>
      27             : #include <vigra/basicimage.hxx>
      28             : #include <vigra/iteratortraits.hxx>
      29             : 
      30             : namespace basebmp
      31             : {
      32             : 
      33             : template< class SourceIter, class SourceAcc,
      34             :           class DestIter, class DestAcc >
      35       20771 : void scaleLine( SourceIter      s_begin,
      36             :                 SourceIter      s_end,
      37             :                 SourceAcc       s_acc,
      38             :                 DestIter        d_begin,
      39             :                 DestIter        d_end,
      40             :                 DestAcc         d_acc )
      41             : {
      42       20771 :     const int src_width  = s_end - s_begin;
      43       20771 :     const int dest_width = d_end - d_begin;
      44             : 
      45             :     OSL_ASSERT( src_width > 0 && dest_width > 0 );
      46             : 
      47       20771 :     if( src_width >= dest_width )
      48             :     {
      49             :         // shrink
      50        1180 :         int rem = 0;
      51       27357 :         while( s_begin != s_end )
      52             :         {
      53       24997 :             if( rem >= 0 )
      54             :             {
      55       11217 :                 d_acc.set( s_acc(s_begin), d_begin );
      56             : 
      57       11217 :                 rem -= src_width;
      58       11217 :                 ++d_begin;
      59             :             }
      60             : 
      61       24997 :             rem += dest_width;
      62       24997 :             ++s_begin;
      63             :         }
      64             :     }
      65             :     else
      66             :     {
      67             :         // enlarge
      68       19591 :         int rem = -dest_width;
      69     5198900 :         while( d_begin != d_end )
      70             :         {
      71     5159718 :             if( rem >= 0 )
      72             :             {
      73     1946621 :                 rem -= dest_width;
      74     1946621 :                 ++s_begin;
      75             :             }
      76             : 
      77     5159718 :             d_acc.set( s_acc(s_begin), d_begin );
      78             : 
      79     5159718 :             rem += src_width;
      80     5159718 :             ++d_begin;
      81             :         }
      82             :     }
      83       20771 : }
      84             : 
      85             : /** Scale an image using zero order interpolation (pixel replication)
      86             : 
      87             :     Source and destination range must be at least one pixel wide and
      88             :     high.
      89             : 
      90             :     @param s_begin
      91             :     Start iterator for source image
      92             : 
      93             :     @param s_end
      94             :     End iterator for source image
      95             : 
      96             :     @param s_acc
      97             :     Source accessor
      98             : 
      99             :     @param d_begin
     100             :     Start iterator for destination image
     101             : 
     102             :     @param d_end
     103             :     End iterator for destination image
     104             : 
     105             :     @param d_acc
     106             :     Destination accessor
     107             : 
     108             :     @param bMustCopy
     109             :     When true, scaleImage always copies source, even when doing 1:1
     110             :     copy
     111             :  */
     112             : template< class SourceIter, class SourceAcc,
     113             :           class DestIter, class DestAcc >
     114       73498 : void scaleImage( SourceIter      s_begin,
     115             :                  SourceIter      s_end,
     116             :                  SourceAcc       s_acc,
     117             :                  DestIter        d_begin,
     118             :                  DestIter        d_end,
     119             :                  DestAcc         d_acc,
     120             :                  bool            bMustCopy=false )
     121             : {
     122       73498 :     const int src_width ( s_end.x - s_begin.x );
     123       73498 :     const int src_height( s_end.y - s_begin.y );
     124             : 
     125       73498 :     const int dest_width ( d_end.x - d_begin.x );
     126       73498 :     const int dest_height( d_end.y - d_begin.y );
     127             : 
     128       73498 :     if( !bMustCopy &&
     129             :         src_width == dest_width &&
     130             :         src_height == dest_height )
     131             :     {
     132             :         // no scaling involved, can simply copy
     133       73086 :         vigra::copyImage( s_begin, s_end, s_acc,
     134      133218 :                           d_begin, d_acc );
     135      146584 :         return;
     136             :     }
     137             : 
     138             :     typedef vigra::BasicImage<typename SourceAcc::value_type> TmpImage;
     139             :     typedef typename TmpImage::traverser TmpImageIter;
     140             : 
     141             :     TmpImage     tmp_image(src_width,
     142         412 :                            dest_height);
     143         412 :     TmpImageIter t_begin = tmp_image.upperLeft();
     144             : 
     145             :     // scale in y direction
     146        8060 :     for( int x=0; x<src_width; ++x, ++s_begin.x, ++t_begin.x )
     147             :     {
     148        7648 :         typename SourceIter::column_iterator   s_cbegin = s_begin.columnIterator();
     149        7648 :         typename TmpImageIter::column_iterator t_cbegin = t_begin.columnIterator();
     150             : 
     151        7648 :         scaleLine(s_cbegin, s_cbegin+src_height, s_acc,
     152       15296 :                   t_cbegin, t_cbegin+dest_height, tmp_image.accessor());
     153             :     }
     154             : 
     155         412 :     t_begin = tmp_image.upperLeft();
     156             : 
     157             :     // scale in x direction
     158       13535 :     for( int y=0; y<dest_height; ++y, ++d_begin.y, ++t_begin.y )
     159             :     {
     160       13123 :         typename DestIter::row_iterator     d_rbegin = d_begin.rowIterator();
     161       13123 :         typename TmpImageIter::row_iterator t_rbegin = t_begin.rowIterator();
     162             : 
     163       13123 :         scaleLine(t_rbegin, t_rbegin+src_width, tmp_image.accessor(),
     164       26246 :                   d_rbegin, d_rbegin+dest_width, d_acc);
     165         412 :     }
     166             : }
     167             : 
     168             : /** Scale an image, range tuple version
     169             : 
     170             :     @param bMustCopy
     171             :     When true, scaleImage always copies source, even when doing 1:1
     172             :     copy
     173             :  */
     174             : template< class SourceIter, class SourceAcc,
     175             :           class DestIter, class DestAcc >
     176       73498 : inline void scaleImage( vigra::triple<SourceIter,SourceIter,SourceAcc> const& src,
     177             :                         vigra::triple<DestIter,DestIter,DestAcc> const&       dst,
     178             :                         bool                                                  bMustCopy=false )
     179             : {
     180       73498 :     scaleImage(src.first,src.second,src.third,
     181             :                dst.first,dst.second,dst.third,
     182      140496 :                bMustCopy);
     183       73498 : }
     184             : 
     185             : }
     186             : 
     187             : #endif /* INCLUDED_BASEBMP_SCALEIMAGE_HXX */
     188             : 
     189             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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