vcl/source/bitmap/BitmapShadowFilter.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/bitmapex.hxx>
  12 #include <vcl/BitmapColor.hxx>
  13 #include <vcl/BitmapShadowFilter.hxx>
  14
  15 #include <bitmap/BitmapWriteAccess.hxx>
  16
  17 BitmapEx BitmapShadowFilter::execute(BitmapEx const& rBitmapEx) const
  18 {
  19     BitmapEx aBitmapEx(rBitmapEx);
  20     BitmapScopedWriteAccess pWriteAccess(const_cast<Bitmap&>(aBitmapEx.GetBitmap()));
  21
  22     if (!pWriteAccess)
  23         return rBitmapEx;
  24
  25     for (tools::Long y(0); y < pWriteAccess->Height(); y++)
  26     {
  27         Scanline pScanline = pWriteAccess->GetScanline(y);
  28
  29         for (tools::Long x(0); x < pWriteAccess->Width(); x++)
  30         {
  31             const BitmapColor aColor = pWriteAccess->GetColor(y, x);
  32             sal_uInt16 nLuminance(static_cast<sal_uInt16>(aColor.GetLuminance()) + 1);
  33             const BitmapColor aDestColor(
  34                 static_cast<sal_uInt8>(
  35                     (nLuminance * static_cast<sal_uInt16>(maShadowColor.GetRed())) >> 8),
  36                 static_cast<sal_uInt8>(
  37                     (nLuminance * static_cast<sal_uInt16>(maShadowColor.GetGreen())) >> 8),
  38                 static_cast<sal_uInt8>(
  39                     (nLuminance * static_cast<sal_uInt16>(maShadowColor.GetBlue())) >> 8));
  40
  41             pWriteAccess->SetPixelOnData(pScanline, x, aDestColor);
  42         }
  43     }
  44
  45     return aBitmapEx;
  46 }
  47
  48 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */