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             :  */
      10             : 
      11             : #include <BitmapSymmetryCheck.hxx>
      12             : 
      13           2 : BitmapSymmetryCheck::BitmapSymmetryCheck()
      14           2 : {}
      15             : 
      16           2 : BitmapSymmetryCheck::~BitmapSymmetryCheck()
      17           2 : {}
      18             : 
      19           3 : bool BitmapSymmetryCheck::check(Bitmap& rBitmap)
      20             : {
      21           3 :     Bitmap::ScopedReadAccess aReadAccess(rBitmap);
      22           3 :     return checkImpl(aReadAccess.get());
      23             : }
      24             : 
      25           3 : bool BitmapSymmetryCheck::checkImpl(BitmapReadAccess* pReadAccess)
      26             : {
      27           3 :     long nHeight = pReadAccess->Height();
      28           3 :     long nWidth = pReadAccess->Width();
      29             : 
      30           3 :     long nHeightHalf = nHeight / 2;
      31           3 :     long nWidthHalf = nWidth / 2;
      32             : 
      33           3 :     bool nHeightEven = (nHeight % 2) == 0;
      34           3 :     bool nWidthEven = (nWidth % 2) == 0;
      35             : 
      36          35 :     for (long y = 0; y < nHeightHalf; ++y)
      37             :     {
      38         531 :         for (long x = 0; x < nWidthHalf; ++x)
      39             :         {
      40         499 :             if (pReadAccess->GetPixel(y, x) != pReadAccess->GetPixel(nHeight - y - 1, x))
      41             :             {
      42           0 :                 return false;
      43             :             }
      44         499 :             if (pReadAccess->GetPixel(y, x) != pReadAccess->GetPixel(y, nWidth - x - 1))
      45             :             {
      46           0 :                 return false;
      47             :             }
      48         499 :             if (pReadAccess->GetPixel(y, x) != pReadAccess->GetPixel(nHeight - y - 1, nWidth - x - 1))
      49             :             {
      50           0 :                 return false;
      51             :             }
      52             :         }
      53             :     }
      54             : 
      55           3 :     if (nWidthEven)
      56             :     {
      57          17 :         for (long y = 0; y < nHeightHalf; ++y)
      58             :         {
      59          15 :             if (pReadAccess->GetPixel(y, nWidthHalf) != pReadAccess->GetPixel(nHeight - y - 1, nWidthHalf))
      60             :             {
      61           0 :                 return false;
      62             :             }
      63             :         }
      64             :     }
      65             : 
      66           3 :     if (nHeightEven)
      67             :     {
      68          17 :         for (long x = 0; x < nWidthHalf; ++x)
      69             :         {
      70          15 :             if (pReadAccess->GetPixel(nHeightHalf, x) != pReadAccess->GetPixel(nHeightHalf, nWidth - x - 1))
      71             :             {
      72           0 :                 return false;
      73             :             }
      74             :         }
      75             :     }
      76             : 
      77           3 :     return true;
      78             : }
      79             : 
      80             : 
      81             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */