vcl/source/bitmap/BitmapLightenFilter.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 <basegfx/color/bcolortools.hxx>
  12
  13 #include <vcl/BitmapWriteAccess.hxx>
  14 #include <bitmap/BitmapLightenFilter.hxx>
  15
  16 BitmapEx BitmapLightenFilter::execute(BitmapEx const& rBitmapEx) const
  17 {
  18     const Size aSize(rBitmapEx.GetSizePixel());
  19
  20     const Bitmap& aBitmap(rBitmapEx.GetBitmap());
  21     Bitmap aDarkBitmap(aSize, vcl::PixelFormat::N24_BPP);
  22
  23     BitmapScopedReadAccess pRead(aBitmap);
  24     BitmapScopedWriteAccess pWrite(aDarkBitmap);
  25
  26     if (pRead && pWrite)
  27     {
  28         for (sal_Int32 nY = 0; nY < sal_Int32(aSize.Height()); ++nY)
  29         {
  30             Scanline pScanline = pWrite->GetScanline(nY);
  31             Scanline pScanlineRead = pRead->GetScanline(nY);
  32             for (sal_Int32 nX = 0; nX < sal_Int32(aSize.Width()); ++nX)
  33             {
  34                 BitmapColor aBmpColor
  35                     = pRead->HasPalette()
  36                           ? pRead->GetPaletteColor(pRead->GetIndexFromData(pScanlineRead, nX))
  37                           : pRead->GetPixelFromData(pScanlineRead, nX);
  38                 aBmpColor.Invert();
  39                 basegfx::BColor aBColor(aBmpColor.getBColor());
  40                 aBColor = basegfx::utils::rgb2hsl(aBColor);
  41
  42                 double fHue = aBColor.getRed();
  43                 fHue += 180.0;
  44
  45                 while (fHue > 360.0)
  46                 {
  47                     fHue -= 360.0;
  48                 }
  49
  50                 aBColor.setRed(fHue);
  51
  52                 aBColor = basegfx::utils::hsl2rgb(aBColor);
  53                 aBmpColor.SetRed((aBColor.getRed() * 255.0) + 0.5);
  54                 aBmpColor.SetGreen((aBColor.getGreen() * 255.0) + 0.5);
  55                 aBmpColor.SetBlue((aBColor.getBlue() * 255.0) + 0.5);
  56
  57                 pWrite->SetPixelOnData(pScanline, nX, aBmpColor);
  58             }
  59         }
  60     }
  61     pWrite.reset();
  62     pRead.reset();
  63
  64     return BitmapEx(aDarkBitmap, rBitmapEx.GetAlphaMask());
  65 }
  66
  67 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */