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 #include <vcl/bitmapaccess.hxx>
  15
  16 #include <bitmapwriteaccess.hxx>
  17
  18 BitmapEx BitmapMonochromeFilter::execute(BitmapEx const& aBitmapEx) const
  19 {
  20     Bitmap aBitmap = aBitmapEx.GetBitmap();
  21     Bitmap::ScopedReadAccess pReadAcc(aBitmap);
  22     bool bRet = false;
  23
  24     if (pReadAcc)
  25     {
  26         Bitmap aNewBmp(aBitmap.GetSizePixel(), 1);
  27         BitmapScopedWriteAccess pWriteAcc(aNewBmp);
  28
  29         if (pWriteAcc)
  30         {
  31             const BitmapColor aBlack(pWriteAcc->GetBestMatchingColor(COL_BLACK));
  32             const BitmapColor aWhite(pWriteAcc->GetBestMatchingColor(COL_WHITE));
  33             const long nWidth = pWriteAcc->Width();
  34             const long nHeight = pWriteAcc->Height();
  35
  36             if (pReadAcc->HasPalette())
  37             {
  38                 for (long nY = 0; nY < nHeight; nY++)
  39                 {
  40                     Scanline pScanline = pWriteAcc->GetScanline(nY);
  41                     Scanline pScanlineRead = pReadAcc->GetScanline(nY);
  42                     for (long nX = 0; nX < nWidth; nX++)
  43                     {
  44                         const sal_uInt8 cIndex = pReadAcc->GetIndexFromData(pScanlineRead, nX);
  45                         if (pReadAcc->GetPaletteColor(cIndex).GetLuminance() >= mcThreshold)
  46                         {
  47                             pWriteAcc->SetPixelOnData(pScanline, nX, aWhite);
  48                         }
  49                         else
  50                         {
  51                             pWriteAcc->SetPixelOnData(pScanline, nX, aBlack);
  52                         }
  53                     }
  54                 }
  55             }
  56             else
  57             {
  58                 for (long nY = 0; nY < nHeight; nY++)
  59                 {
  60                     Scanline pScanline = pWriteAcc->GetScanline(nY);
  61                     Scanline pScanlineRead = pReadAcc->GetScanline(nY);
  62                     for (long nX = 0; nX < nWidth; nX++)
  63                     {
  64                         if (pReadAcc->GetPixelFromData(pScanlineRead, nX).GetLuminance()
  65                             >= mcThreshold)
  66                         {
  67                             pWriteAcc->SetPixelOnData(pScanline, nX, aWhite);
  68                         }
  69                         else
  70                         {
  71                             pWriteAcc->SetPixelOnData(pScanline, nX, aBlack);
  72                         }
  73                     }
  74                 }
  75             }
  76
  77             pWriteAcc.reset();
  78             bRet = true;
  79         }
  80
  81         pReadAcc.reset();
  82
  83         if (bRet)
  84         {
  85             const MapMode aMap(aBitmap.GetPrefMapMode());
  86             const Size aSize(aBitmap.GetPrefSize());
  87
  88             aBitmap = aNewBmp;
  89
  90             aBitmap.SetPrefMapMode(aMap);
  91             aBitmap.SetPrefSize(aSize);
  92         }
  93     }
  94
  95     if (bRet)
  96         return BitmapEx(aBitmap);
  97
  98     return BitmapEx();
  99 }
 100
 101 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */