vcl/source/bitmap/BitmapDuoToneFilter.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/BitmapDuoToneFilter.hxx>
  14 #include <vcl/bitmapaccess.hxx>
  15
  16 #include <bitmapwriteaccess.hxx>
  17
  18 static sal_uInt8 lcl_getDuotoneColorComponent(sal_uInt8 base, sal_uInt16 color1, sal_uInt16 color2)
  19 {
  20     color2 = color2 * base / 0xFF;
  21     color1 = color1 * (0xFF - base) / 0xFF;
  22
  23     return static_cast<sal_uInt8>(color1 + color2);
  24 }
  25
  26 BitmapEx BitmapDuoToneFilter::execute(BitmapEx const& rBitmapEx) const
  27 {
  28     Bitmap aBitmap(rBitmapEx.GetBitmap());
  29
  30     const long nWidth = aBitmap.GetSizePixel().Width();
  31     const long nHeight = aBitmap.GetSizePixel().Height();
  32
  33     Bitmap aResultBitmap(aBitmap.GetSizePixel(), 24);
  34     Bitmap::ScopedReadAccess pReadAcc(aBitmap);
  35     BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
  36     const BitmapColor aColorOne(static_cast<sal_uInt8>(mnColorOne >> 16),
  37                                 static_cast<sal_uInt8>(mnColorOne >> 8),
  38                                 static_cast<sal_uInt8>(mnColorOne));
  39     const BitmapColor aColorTwo(static_cast<sal_uInt8>(mnColorTwo >> 16),
  40                                 static_cast<sal_uInt8>(mnColorTwo >> 8),
  41                                 static_cast<sal_uInt8>(mnColorTwo));
  42
  43     for (long x = 0; x < nWidth; x++)
  44     {
  45         for (long y = 0; y < nHeight; y++)
  46         {
  47             BitmapColor aColor = pReadAcc->GetColor(y, x);
  48             sal_uInt8 nLuminance = aColor.GetLuminance();
  49             BitmapColor aResultColor(
  50                 lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetRed(), aColorTwo.GetRed()),
  51                 lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetGreen(),
  52                                              aColorTwo.GetGreen()),
  53                 lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetBlue(), aColorTwo.GetBlue()));
  54             pWriteAcc->SetPixel(y, x, aResultColor);
  55         }
  56     }
  57
  58     pWriteAcc.reset();
  59     pReadAcc.reset();
  60     aBitmap.ReassignWithSize(aResultBitmap);
  61
  62     return BitmapEx(aBitmap);
  63 }
  64
  65 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */