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/bitmap/BitmapShadowFilter.hxx>
  12 #include <vcl/BitmapColor.hxx>
  13 #include <vcl/BitmapWriteAccess.hxx>
  14
  15 BitmapEx BitmapShadowFilter::execute(BitmapEx const& rBitmapEx) const
  16 {
  17     const BitmapEx& aBitmapEx(rBitmapEx);
  18     BitmapScopedWriteAccess pWriteAccess(const_cast<Bitmap&>(aBitmapEx.GetBitmap()));
  19
  20     if (!pWriteAccess)
  21         return rBitmapEx;
  22
  23     for (sal_Int32 y(0); y < sal_Int32(pWriteAccess->Height()); y++)
  24     {
  25         Scanline pScanline = pWriteAccess->GetScanline(y);
  26
  27         for (sal_Int32 x(0); x < sal_Int32(pWriteAccess->Width()); x++)
  28         {
  29             const BitmapColor aColor = pWriteAccess->GetColor(y, x);
  30             sal_uInt16 nLuminance(static_cast<sal_uInt16>(aColor.GetLuminance()) + 1);
  31             const BitmapColor aDestColor(
  32                 static_cast<sal_uInt8>(
  33                     (nLuminance * static_cast<sal_uInt16>(maShadowColor.GetRed())) >> 8),
  34                 static_cast<sal_uInt8>(
  35                     (nLuminance * static_cast<sal_uInt16>(maShadowColor.GetGreen())) >> 8),
  36                 static_cast<sal_uInt8>(
  37                     (nLuminance * static_cast<sal_uInt16>(maShadowColor.GetBlue())) >> 8));
  38
  39             pWriteAccess->SetPixelOnData(pScanline, x, aDestColor);
  40         }
  41     }
  42
  43     return aBitmapEx;
  44 }
  45
  46 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */