include/vcl/BitmapGaussianSeparableBlurFilter.hxx

   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 #ifndef INCLUDED_VCL_BITMAPGAUSSIANSEPARABLEBLURFILTER_HXX
  12 #define INCLUDED_VCL_BITMAPGAUSSIANSEPARABLEBLURFILTER_HXX
  13
  14 #include <vcl/BitmapFilter.hxx>
  15 #include <vector>
  16
  17 class BitmapEx;
  18
  19 class BitmapGaussianSeparableBlurFilter final : public BitmapFilter
  20 {
  21 public:
  22     BitmapGaussianSeparableBlurFilter(double fRadius)
  23         : mfRadius(fRadius)
  24     {
  25     }
  26
  27     /** Separable Gaussian Blur filter and accepts a blur radius
  28         as a parameter so the user can change the strength of the blur.
  29         Radius of 1.0 is 3 * standard deviation of gauss function.
  30
  31         Separable Blur implementation uses 2x separable 1D convolution
  32         to process the image.
  33     */
  34     virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
  35
  36 private:
  37     double mfRadius;
  38
  39     static bool convolutionPass(const Bitmap& rBitmap, Bitmap& aNewBitmap,
  40                                 BitmapReadAccess const* pReadAcc, int aNumberOfContributions,
  41                                 const double* pWeights, int const* pPixels, const int* pCount);
  42
  43     static std::vector<double> makeBlurKernel(const double radius, int& rows);
  44     static void blurContributions(const int aSize, const int aNumberOfContributions,
  45                                   const std::vector<double>& rBlurVector,
  46                                   std::vector<double>& rWeights, std::vector<int>& rPixels,
  47                                   std::vector<int>& rCounts);
  48 };
  49
  50 #endif
  51
  52 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */