vcl: Bitmap::ImplSeparableUnsharpenFilter() -> BitmapSeparableUnsharpenFilter

Change-Id: I62d95cc8bbf7b9349b1abc3e58bf0a202e3afec5
Reviewed-on: https://gerrit.libreoffice.org/53091
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

3 files changed, 81 insertions, 49 deletions

diff --git a/vcl/Library_vcl.mk b/vcl/Library_vcl.mk
index dc3b8a3318c6..8a2edf75b2b4 100644
--- a/vcl/Library_vcl.mk
+++ b/vcl/Library_vcl.mk
@@ -318,6 +318,7 @@ $(eval $(call gb_Library_add_exception_objects,vcl,\
     vcl/source/bitmap/BitmapColorizeFilter \
     vcl/source/bitmap/bitmappaint \
     vcl/source/bitmap/BitmapGaussianSeparableBlurFilter \
+    vcl/source/bitmap/BitmapSeparableUnsharpenFilter \
     vcl/source/bitmap/BitmapFastScaleFilter \
     vcl/source/bitmap/BitmapScaleSuperFilter \
     vcl/source/bitmap/BitmapScaleConvolutionFilter \
diff --git a/vcl/source/bitmap/BitmapSeparableUnsharpenFilter.cxx b/vcl/source/bitmap/BitmapSeparableUnsharpenFilter.cxx
new file mode 100644
index 000000000000..f594a808cc14
--- /dev/null
+++ b/vcl/source/bitmap/BitmapSeparableUnsharpenFilter.cxx
@@ -0,0 +1,76 @@
+/* -*- 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/.
+ *
+ */
+
+#include <basegfx/color/bcolortools.hxx>
+
+#include <vcl/bitmap.hxx>
+#include <vcl/bitmapex.hxx>
+#include <vcl/bitmapaccess.hxx>
+#include <vcl/BitmapGaussianSeparableBlurFilter.hxx>
+#include <vcl/BitmapSeparableUnsharpenFilter.hxx>
+
+#include <bitmapwriteaccess.hxx>
+
+BitmapEx BitmapSeparableUnsharpenFilter::execute(BitmapEx const& rBitmapEx)
+{
+    Bitmap aBitmap(rBitmapEx.GetBitmap());
+
+    const long nWidth = aBitmap.GetSizePixel().Width();
+    const long nHeight = aBitmap.GetSizePixel().Height();
+
+    Bitmap aBlur(aBitmap);
+    BitmapEx aBlurEx(aBlur);
+
+    BitmapFilter::Filter(aBlurEx, BitmapGaussianSeparableBlurFilter(-mfRadius));
+    aBlur = aBlurEx.GetBitmap();
+
+    // Amount of unsharpening effect on image - currently set to a fixed value
+    double aAmount = 2.0;
+
+    Bitmap aResultBitmap(Size(nWidth, nHeight), 24);
+
+    Bitmap::ScopedReadAccess pReadAccBlur(aBlur);
+    Bitmap::ScopedReadAccess pReadAcc(aBitmap);
+    BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
+
+    BitmapColor aColor, aColorBlur;
+
+    // For all pixels in original image subtract pixels values from blurred image
+    for (long y = 0; y < nHeight; y++)
+    {
+        Scanline pScanline = pWriteAcc->GetScanline(y);
+        for (long x = 0; x < nWidth; x++)
+        {
+            aColorBlur = pReadAccBlur->GetColor(y, x);
+            aColor = pReadAcc->GetColor(y, x);
+
+            BitmapColor aResultColor(
+                static_cast<sal_uInt8>(MinMax(
+                    aColor.GetRed() + (aColor.GetRed() - aColorBlur.GetRed()) * aAmount, 0, 255)),
+                static_cast<sal_uInt8>(MinMax(
+                    aColor.GetGreen() + (aColor.GetGreen() - aColorBlur.GetGreen()) * aAmount, 0,
+                    255)),
+                static_cast<sal_uInt8>(
+                    MinMax(aColor.GetBlue() + (aColor.GetBlue() - aColorBlur.GetBlue()) * aAmount,
+                           0, 255)));
+
+            pWriteAcc->SetPixelOnData(pScanline, x, aResultColor);
+        }
+    }
+
+    pWriteAcc.reset();
+    pReadAcc.reset();
+    pReadAccBlur.reset();
+    aBitmap.ReassignWithSize(aResultBitmap);
+
+    return BitmapEx(aBitmap);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/source/gdi/bitmap4.cxx b/vcl/source/gdi/bitmap4.cxx
index e48a2edae9b3..1c739c380bc7 100644
--- a/vcl/source/gdi/bitmap4.cxx
+++ b/vcl/source/gdi/bitmap4.cxx
@@ -21,6 +21,7 @@
 #include <vcl/bitmapaccess.hxx>
 #include <vcl/bitmap.hxx>
 #include <vcl/BitmapGaussianSeparableBlurFilter.hxx>
+#include <vcl/BitmapSeparableUnsharpenFilter.hxx>
 
 #include <bitmapwriteaccess.hxx>
 
@@ -61,7 +62,9 @@ bool Bitmap::Filter( BmpFilter eFilter, const BmpFilterParam* pFilterParam )
             // Unsharpen Mask for negative values of mnRadius
             else if (pFilterParam->mnRadius < 0.0)
             {
-                bRet = ImplSeparableUnsharpenFilter(pFilterParam->mnRadius);
+                BitmapEx aBmpEx(*this);
+                bRet = BitmapFilter::Filter(aBmpEx, BitmapSeparableUnsharpenFilter(pFilterParam->mnRadius));
+                *this = aBmpEx.GetBitmap();
             }
             else
             {
@@ -1067,54 +1070,6 @@ bool Bitmap::ImplPopArt()
     return bRet;
 }
 
-// Separable Unsharpen Mask filter is actually a subtracted blurred
-// image from the original image.
-bool Bitmap::ImplSeparableUnsharpenFilter(const double radius) {
-    const long  nWidth = GetSizePixel().Width();
-    const long  nHeight = GetSizePixel().Height();
-
-    Bitmap aBlur( *this );
-    BitmapEx aBlurEx(aBlur);
-
-    BitmapFilter::Filter(aBlurEx, BitmapGaussianSeparableBlurFilter(-radius));
-    aBlur = aBlurEx.GetBitmap();
-
-    // Amount of unsharpening effect on image - currently set to a fixed value
-    double aAmount = 2.0;
-
-    Bitmap aResultBitmap( Size( nWidth, nHeight ), 24);
-
-    ScopedReadAccess pReadAccBlur(aBlur);
-    ScopedReadAccess pReadAcc(*this);
-    BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
-
-    BitmapColor aColor, aColorBlur;
-
-    // For all pixels in original image subtract pixels values from blurred image
-    for( long y = 0; y < nHeight; y++ )
-    {
-        Scanline pScanline = pWriteAcc->GetScanline(y);
-        for( long x = 0; x < nWidth; x++ )
-        {
-            aColorBlur = pReadAccBlur->GetColor( y , x );
-            aColor = pReadAcc->GetColor( y , x );
-
-            BitmapColor aResultColor(
-                static_cast<sal_uInt8>(MinMax( aColor.GetRed()   + (aColor.GetRed()   - aColorBlur.GetRed())   * aAmount, 0, 255 )),
-                static_cast<sal_uInt8>(MinMax( aColor.GetGreen() + (aColor.GetGreen() - aColorBlur.GetGreen()) * aAmount, 0, 255 )),
-                static_cast<sal_uInt8>(MinMax( aColor.GetBlue()  + (aColor.GetBlue()  - aColorBlur.GetBlue())  * aAmount, 0, 255 )) );
-
-            pWriteAcc->SetPixelOnData( pScanline, x, aResultColor );
-        }
-    }
-
-    pWriteAcc.reset();
-    pReadAcc.reset();
-    pReadAccBlur.reset();
-    ReassignWithSize(aResultBitmap);
-    return true;
-}
-
 bool Bitmap::ImplDuotoneFilter( const sal_uLong nColorOne, const sal_uLong nColorTwo )
 {
     const long  nWidth = GetSizePixel().Width();