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/bitmapaccess.hxx>
  14
  15 #include <bitmapwriteaccess.hxx>
  16 #include <BitmapLightenFilter.hxx>
  17
  18 BitmapEx BitmapLightenFilter::execute(BitmapEx const& rBitmapEx) const
  19 {
  20     const Size aSize(rBitmapEx.GetSizePixel());
  21
  22     Bitmap aBitmap(rBitmapEx.GetBitmap());
  23     Bitmap aDarkBitmap(aSize, 24);
  24
  25     Bitmap::ScopedReadAccess pRead(aBitmap);
  26     BitmapScopedWriteAccess pWrite(aDarkBitmap);
  27
  28     if (pRead && pWrite)
  29     {
  30         for (tools::Long nY = 0; nY < aSize.Height(); ++nY)
  31         {
  32             Scanline pScanline = pWrite->GetScanline(nY);
  33             Scanline pScanlineRead = pRead->GetScanline(nY);
  34             for (tools::Long nX = 0; nX < aSize.Width(); ++nX)
  35             {
  36                 BitmapColor aBmpColor
  37                     = pRead->HasPalette()
  38                           ? pRead->GetPaletteColor(pRead->GetIndexFromData(pScanlineRead, nX))
  39                           : pRead->GetPixelFromData(pScanlineRead, nX);
  40                 aBmpColor.Invert();
  41                 basegfx::BColor aBColor(aBmpColor.getBColor());
  42                 aBColor = basegfx::utils::rgb2hsl(aBColor);
  43
  44                 double fHue = aBColor.getRed();
  45                 fHue += 180.0;
  46
  47                 while (fHue > 360.0)
  48                 {
  49                     fHue -= 360.0;
  50                 }
  51
  52                 aBColor.setRed(fHue);
  53
  54                 aBColor = basegfx::utils::hsl2rgb(aBColor);
  55                 aBmpColor.SetRed((aBColor.getRed() * 255.0) + 0.5);
  56                 aBmpColor.SetGreen((aBColor.getGreen() * 255.0) + 0.5);
  57                 aBmpColor.SetBlue((aBColor.getBlue() * 255.0) + 0.5);
  58
  59                 pWrite->SetPixelOnData(pScanline, nX, aBmpColor);
  60             }
  61         }
  62     }
  63     pWrite.reset();
  64     pRead.reset();
  65
  66     return BitmapEx(aDarkBitmap, rBitmapEx.GetAlpha());
  67 }
  68
  69 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */