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/BitmapDuoToneFilter.hxx>
  12 #include <vcl/BitmapWriteAccess.hxx>
  13
  14 static sal_uInt8 lcl_getDuotoneColorComponent(sal_uInt8 base, sal_uInt16 color1, sal_uInt16 color2)
  15 {
  16     color2 = color2 * base / 0xFF;
  17     color1 = color1 * (0xFF - base) / 0xFF;
  18
  19     return static_cast<sal_uInt8>(color1 + color2);
  20 }
  21
  22 BitmapEx BitmapDuoToneFilter::execute(BitmapEx const& rBitmapEx) const
  23 {
  24     Bitmap aBitmap(rBitmapEx.GetBitmap());
  25
  26     const sal_Int32 nWidth = aBitmap.GetSizePixel().Width();
  27     const sal_Int32 nHeight = aBitmap.GetSizePixel().Height();
  28
  29     Bitmap aResultBitmap(aBitmap.GetSizePixel(), vcl::PixelFormat::N24_BPP);
  30     BitmapScopedReadAccess pReadAcc(aBitmap);
  31     BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
  32     const BitmapColor aColorOne(mnColorOne);
  33     const BitmapColor aColorTwo(mnColorTwo);
  34
  35     for (sal_Int32 x = 0; x < nWidth; x++)
  36     {
  37         for (sal_Int32 y = 0; y < nHeight; y++)
  38         {
  39             BitmapColor aColor = pReadAcc->GetColor(y, x);
  40             sal_uInt8 nLuminance = aColor.GetLuminance();
  41             BitmapColor aResultColor(
  42                 lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetRed(), aColorTwo.GetRed()),
  43                 lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetGreen(),
  44                                              aColorTwo.GetGreen()),
  45                 lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetBlue(), aColorTwo.GetBlue()));
  46             pWriteAcc->SetPixel(y, x, aResultColor);
  47         }
  48     }
  49
  50     pWriteAcc.reset();
  51     pReadAcc.reset();
  52     aBitmap.ReassignWithSize(aResultBitmap);
  53
  54     return BitmapEx(aBitmap);
  55 }
  56
  57 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */