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
  13 #include <vcl/bitmap/BitmapGaussianSeparableBlurFilter.hxx>
  14 #include <vcl/bitmap/BitmapSeparableUnsharpenFilter.hxx>
  15 #include <vcl/BitmapWriteAccess.hxx>
  16
  17 BitmapEx BitmapSeparableUnsharpenFilter::execute(BitmapEx const& rBitmapEx) const
  18 {
  19     Bitmap aBitmap(rBitmapEx.GetBitmap());
  20
  21     const sal_Int32 nWidth = aBitmap.GetSizePixel().Width();
  22     const sal_Int32 nHeight = aBitmap.GetSizePixel().Height();
  23
  24     Bitmap aBlur(aBitmap);
  25     BitmapEx aBlurEx(aBlur);
  26
  27     BitmapFilter::Filter(aBlurEx, BitmapGaussianSeparableBlurFilter(-mfRadius));
  28     aBlur = aBlurEx.GetBitmap();
  29
  30     // Amount of unsharpening effect on image - currently set to a fixed value
  31     double aAmount = 2.0;
  32
  33     Bitmap aResultBitmap(Size(nWidth, nHeight), vcl::PixelFormat::N24_BPP);
  34
  35     BitmapScopedReadAccess pReadAccBlur(aBlur);
  36     BitmapScopedReadAccess pReadAcc(aBitmap);
  37     BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
  38
  39     BitmapColor aColor, aColorBlur;
  40
  41     // For all pixels in original image subtract pixels values from blurred image
  42     for (sal_Int32 y = 0; y < nHeight; y++)
  43     {
  44         Scanline pScanline = pWriteAcc->GetScanline(y);
  45         for (sal_Int32 x = 0; x < nWidth; x++)
  46         {
  47             aColorBlur = pReadAccBlur->GetColor(y, x);
  48             aColor = pReadAcc->GetColor(y, x);
  49
  50             BitmapColor aResultColor(
  51                 static_cast<sal_uInt8>(
  52                     std::clamp(aColor.GetRed() + (aColor.GetRed() - aColorBlur.GetRed()) * aAmount,
  53                                0.0, 255.0)),
  54                 static_cast<sal_uInt8>(std::clamp(
  55                     aColor.GetGreen() + (aColor.GetGreen() - aColorBlur.GetGreen()) * aAmount, 0.0,
  56                     255.0)),
  57                 static_cast<sal_uInt8>(std::clamp(
  58                     aColor.GetBlue() + (aColor.GetBlue() - aColorBlur.GetBlue()) * aAmount, 0.0,
  59                     255.0)));
  60
  61             pWriteAcc->SetPixelOnData(pScanline, x, aResultColor);
  62         }
  63     }
  64
  65     pWriteAcc.reset();
  66     pReadAcc.reset();
  67     pReadAccBlur.reset();
  68     aBitmap.ReassignWithSize(aResultBitmap);
  69
  70     return BitmapEx(aBitmap);
  71 }
  72
  73 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */