vcl/source/bitmap/BitmapSolarizeFilter.cxx

   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 <vcl/bitmap.hxx>
  12 #include <vcl/bitmapex.hxx>
  13 #include <vcl/BitmapSolarizeFilter.hxx>
  14
  15 #include <bitmapwriteaccess.hxx>
  16
  17 BitmapEx BitmapSolarizeFilter::execute(BitmapEx const& rBitmapEx) const
  18 {
  19     Bitmap aBitmap(rBitmapEx.GetBitmap());
  20     bool bRet = false;
  21     BitmapScopedWriteAccess pWriteAcc(aBitmap);
  22
  23     if (pWriteAcc)
  24     {
  25         if (pWriteAcc->HasPalette())
  26         {
  27             const BitmapPalette& rPal = pWriteAcc->GetPalette();
  28
  29             for (sal_uInt16 i = 0, nCount = rPal.GetEntryCount(); i < nCount; i++)
  30             {
  31                 if (rPal[i].GetLuminance() >= mcSolarGreyThreshold)
  32                 {
  33                     BitmapColor aCol(rPal[i]);
  34                     aCol.Invert();
  35                     pWriteAcc->SetPaletteColor(i, aCol);
  36                 }
  37             }
  38         }
  39         else
  40         {
  41             BitmapColor aCol;
  42             const long nWidth = pWriteAcc->Width();
  43             const long nHeight = pWriteAcc->Height();
  44
  45             for (long nY = 0; nY < nHeight; nY++)
  46             {
  47                 Scanline pScanline = pWriteAcc->GetScanline(nY);
  48                 for (long nX = 0; nX < nWidth; nX++)
  49                 {
  50                     aCol = pWriteAcc->GetPixelFromData(pScanline, nX);
  51
  52                     if (aCol.GetLuminance() >= mcSolarGreyThreshold)
  53                     {
  54                         aCol.Invert();
  55                         pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
  56                     }
  57                 }
  58             }
  59         }
  60
  61         pWriteAcc.reset();
  62         bRet = true;
  63     }
  64
  65     if (bRet)
  66         return rBitmapEx;
  67
  68     return BitmapEx();
  69 }
  70
  71 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */