vcl/source/bitmap/BitmapSeparableUnsharpenFilter.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 <tools/helpers.hxx>
  12 #include <vcl/bitmap.hxx>
  13 #include <vcl/bitmapex.hxx>
  14 #include <vcl/bitmapaccess.hxx>
  15 #include <vcl/BitmapGaussianSeparableBlurFilter.hxx>
  16 #include <vcl/BitmapSeparableUnsharpenFilter.hxx>
  17
  18 #include <bitmapwriteaccess.hxx>
  19
  20 BitmapEx BitmapSeparableUnsharpenFilter::execute(BitmapEx const& rBitmapEx) const
  21 {
  22     Bitmap aBitmap(rBitmapEx.GetBitmap());
  23
  24     const long nWidth = aBitmap.GetSizePixel().Width();
  25     const long nHeight = aBitmap.GetSizePixel().Height();
  26
  27     Bitmap aBlur(aBitmap);
  28     BitmapEx aBlurEx(aBlur);
  29
  30     BitmapFilter::Filter(aBlurEx, BitmapGaussianSeparableBlurFilter(-mfRadius));
  31     aBlur = aBlurEx.GetBitmap();
  32
  33     // Amount of unsharpening effect on image - currently set to a fixed value
  34     double aAmount = 2.0;
  35
  36     Bitmap aResultBitmap(Size(nWidth, nHeight), 24);
  37
  38     Bitmap::ScopedReadAccess pReadAccBlur(aBlur);
  39     Bitmap::ScopedReadAccess pReadAcc(aBitmap);
  40     BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
  41
  42     BitmapColor aColor, aColorBlur;
  43
  44     // For all pixels in original image subtract pixels values from blurred image
  45     for (long y = 0; y < nHeight; y++)
  46     {
  47         Scanline pScanline = pWriteAcc->GetScanline(y);
  48         for (long x = 0; x < nWidth; x++)
  49         {
  50             aColorBlur = pReadAccBlur->GetColor(y, x);
  51             aColor = pReadAcc->GetColor(y, x);
  52
  53             BitmapColor aResultColor(
  54                 static_cast<sal_uInt8>(MinMax(
  55                     aColor.GetRed() + (aColor.GetRed() - aColorBlur.GetRed()) * aAmount, 0, 255)),
  56                 static_cast<sal_uInt8>(MinMax(
  57                     aColor.GetGreen() + (aColor.GetGreen() - aColorBlur.GetGreen()) * aAmount, 0,
  58                     255)),
  59                 static_cast<sal_uInt8>(
  60                     MinMax(aColor.GetBlue() + (aColor.GetBlue() - aColorBlur.GetBlue()) * aAmount,
  61                            0, 255)));
  62
  63             pWriteAcc->SetPixelOnData(pScanline, x, aResultColor);
  64         }
  65     }
  66
  67     pWriteAcc.reset();
  68     pReadAcc.reset();
  69     pReadAccBlur.reset();
  70     aBitmap.ReassignWithSize(aResultBitmap);
  71
  72     return BitmapEx(aBitmap);
  73 }
  74
  75 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */