1 files changed, 52 insertions, 0 deletions
diff --git a/include/vcl/BitmapGaussianSeparableBlurFilter.hxx b/include/vcl/BitmapGaussianSeparableBlurFilter.hxx
new file mode 100644
index 000000000..72b3fdb81
--- /dev/null
+++ b/include/vcl/BitmapGaussianSeparableBlurFilter.hxx
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_BITMAPGAUSSIANSEPARABLEBLURFILTER_HXX
+#define INCLUDED_VCL_BITMAPGAUSSIANSEPARABLEBLURFILTER_HXX
+
+#include <vcl/BitmapFilter.hxx>
+#include <vector>
+
+class BitmapEx;
+
+class BitmapGaussianSeparableBlurFilter final : public BitmapFilter
+{
+public:
+    BitmapGaussianSeparableBlurFilter(double fRadius)
+        : mfRadius(fRadius)
+    {
+    }
+
+    /** Separable Gaussian Blur filter and accepts a blur radius
+        as a parameter so the user can change the strength of the blur.
+        Radius of 1.0 is 3 * standard deviation of gauss function.
+
+        Separable Blur implementation uses 2x separable 1D convolution
+        to process the image.
+    */
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+
+private:
+    double mfRadius;
+
+    static bool convolutionPass(const Bitmap& rBitmap, Bitmap& aNewBitmap,
+                                BitmapReadAccess const* pReadAcc, int aNumberOfContributions,
+                                const double* pWeights, int const* pPixels, const int* pCount);
+
+    static std::vector<double> makeBlurKernel(const double radius, int& rows);
+    static void blurContributions(const int aSize, const int aNumberOfContributions,
+                                  const std::vector<double>& rBlurVector,
+                                  std::vector<double>& rWeights, std::vector<int>& rPixels,
+                                  std::vector<int>& rCounts);
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */