vcl/source/bitmap/BitmapMonochromeFilter.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/BitmapMonochromeFilter.hxx>
  14
  15 #include <bitmap/BitmapWriteAccess.hxx>
  16
  17 BitmapEx BitmapMonochromeFilter::execute(BitmapEx const& aBitmapEx) const
  18 {
  19     Bitmap aBitmap = aBitmapEx.GetBitmap();
  20     Bitmap::ScopedReadAccess pReadAcc(aBitmap);
  21     bool bRet = false;
  22
  23     if (pReadAcc)
  24     {
  25         Bitmap aNewBmp(aBitmap.GetSizePixel(), vcl::PixelFormat::N1_BPP);
  26         BitmapScopedWriteAccess pWriteAcc(aNewBmp);
  27
  28         if (pWriteAcc)
  29         {
  30             const BitmapColor aBlack(pWriteAcc->GetBestMatchingColor(COL_BLACK));
  31             const BitmapColor aWhite(pWriteAcc->GetBestMatchingColor(COL_WHITE));
  32             const tools::Long nWidth = pWriteAcc->Width();
  33             const tools::Long nHeight = pWriteAcc->Height();
  34
  35             if (pReadAcc->HasPalette())
  36             {
  37                 for (tools::Long nY = 0; nY < nHeight; nY++)
  38                 {
  39                     Scanline pScanline = pWriteAcc->GetScanline(nY);
  40                     Scanline pScanlineRead = pReadAcc->GetScanline(nY);
  41                     for (tools::Long nX = 0; nX < nWidth; nX++)
  42                     {
  43                         const sal_uInt8 cIndex = pReadAcc->GetIndexFromData(pScanlineRead, nX);
  44                         if (pReadAcc->GetPaletteColor(cIndex).GetLuminance() >= mcThreshold)
  45                         {
  46                             pWriteAcc->SetPixelOnData(pScanline, nX, aWhite);
  47                         }
  48                         else
  49                         {
  50                             pWriteAcc->SetPixelOnData(pScanline, nX, aBlack);
  51                         }
  52                     }
  53                 }
  54             }
  55             else
  56             {
  57                 for (tools::Long nY = 0; nY < nHeight; nY++)
  58                 {
  59                     Scanline pScanline = pWriteAcc->GetScanline(nY);
  60                     Scanline pScanlineRead = pReadAcc->GetScanline(nY);
  61                     for (tools::Long nX = 0; nX < nWidth; nX++)
  62                     {
  63                         if (pReadAcc->GetPixelFromData(pScanlineRead, nX).GetLuminance()
  64                             >= mcThreshold)
  65                         {
  66                             pWriteAcc->SetPixelOnData(pScanline, nX, aWhite);
  67                         }
  68                         else
  69                         {
  70                             pWriteAcc->SetPixelOnData(pScanline, nX, aBlack);
  71                         }
  72                     }
  73                 }
  74             }
  75
  76             pWriteAcc.reset();
  77             bRet = true;
  78         }
  79
  80         pReadAcc.reset();
  81
  82         if (bRet)
  83         {
  84             const MapMode aMap(aBitmap.GetPrefMapMode());
  85             const Size aSize(aBitmap.GetPrefSize());
  86
  87             aBitmap = aNewBmp;
  88
  89             aBitmap.SetPrefMapMode(aMap);
  90             aBitmap.SetPrefSize(aSize);
  91         }
  92     }
  93
  94     if (bRet)
  95         return BitmapEx(aBitmap);
  96
  97     return BitmapEx();
  98 }
  99
 100 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */