1 files changed, 75 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapSeparableUnsharpenFilter.cxx b/vcl/source/bitmap/BitmapSeparableUnsharpenFilter.cxx
new file mode 100644
index 000000000..bbf5950dc
--- /dev/null
+++ b/vcl/source/bitmap/BitmapSeparableUnsharpenFilter.cxx
@@ -0,0 +1,75 @@
+/* -*- 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 <tools/helpers.hxx>
+
+#include <vcl/bitmap.hxx>
+#include <vcl/bitmapex.hxx>
+#include <vcl/BitmapGaussianSeparableBlurFilter.hxx>
+#include <vcl/BitmapSeparableUnsharpenFilter.hxx>
+
+#include <bitmap/BitmapWriteAccess.hxx>
+
+BitmapEx BitmapSeparableUnsharpenFilter::execute(BitmapEx const& rBitmapEx) const
+{
+    Bitmap aBitmap(rBitmapEx.GetBitmap());
+
+    const sal_Int32 nWidth = aBitmap.GetSizePixel().Width();
+    const sal_Int32 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), vcl::PixelFormat::N24_BPP);
+
+    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 (sal_Int32 y = 0; y < nHeight; y++)
+    {
+        Scanline pScanline = pWriteAcc->GetScanline(y);
+        for (sal_Int32 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: */