vcl: introduce BitmapSharpenFilter

Change-Id: Ib503efa3634b3a000261d2398d04f779079bfe3f
Reviewed-on: https://gerrit.libreoffice.org/53129Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

include/vcl/BitmapConvolutionMatrixFilter.hxx

@@ -20,6 +20,11 @@ class BitmapEx;
 class VCL_DLLPUBLIC BitmapConvolutionMatrixFilter : public BitmapFilter
 {
 public:
+    BitmapConvolutionMatrixFilter()
+        : mpMatrix(nullptr)
+    {
+    }
+
     BitmapConvolutionMatrixFilter(const long* pMatrix)
         : mpMatrix(pMatrix)
     {
@@ -29,7 +34,7 @@ public:
 
     virtual BitmapEx execute(BitmapEx const& rBitmapEx) override;
 
-private:
+protected:
     const long* mpMatrix;
 };
 

include/vcl/BitmapSharpenFilter.hxx

+/* -*- 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_BITMAPSHARPENFILTER_HXX
+#define INCLUDED_VCL_BITMAPSHARPENFILTER_HXX
+
+#include <vcl/BitmapConvolutionMatrixFilter.hxx>
+
+class VCL_DLLPUBLIC BitmapSharpenFilter : public BitmapConvolutionMatrixFilter
+{
+public:
+    BitmapSharpenFilter()
+    {
+        const long pSharpenMatrix[] = { -1, -1, -1, -1, 16, -1, -1, -1, -1 };
+        mpMatrix = &pSharpenMatrix[0];
+    }
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

vcl/source/gdi/bitmap4.cxx

@@ -21,7 +21,7 @@
 #include <vcl/bitmapaccess.hxx>
 #include <vcl/bitmap.hxx>
 #include <vcl/BitmapSmoothenFilter.hxx>
-#include <vcl/BitmapConvolutionMatrixFilter.hxx>
+#include <vcl/BitmapSharpenFilter.hxx>
 
 #include <bitmapwriteaccess.hxx>
 
@@ -60,9 +60,8 @@ bool Bitmap::Filter( BmpFilter eFilter, const BmpFilterParam* pFilterParam )
 
         case BmpFilter::Sharpen:
         {
-            const long pSharpenMatrix[] = { -1, -1,  -1, -1, 16, -1, -1, -1,  -1 };
             BitmapEx aBmpEx(*this);
-            bRet = BitmapFilter::Filter(aBmpEx, BitmapConvolutionMatrixFilter(&pSharpenMatrix[0]));
+            bRet = BitmapFilter::Filter(aBmpEx, BitmapSharpenFilter());
             *this = aBmpEx.GetBitmap();
         }
         break;