1 files changed, 67 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapLightenFilter.cxx b/vcl/source/bitmap/BitmapLightenFilter.cxx
new file mode 100644
index 000000000..47fa49a70
--- /dev/null
+++ b/vcl/source/bitmap/BitmapLightenFilter.cxx
@@ -0,0 +1,67 @@
+/* -*- 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 <bitmap/BitmapWriteAccess.hxx>
+#include <bitmap/BitmapLightenFilter.hxx>
+
+BitmapEx BitmapLightenFilter::execute(BitmapEx const& rBitmapEx) const
+{
+    const Size aSize(rBitmapEx.GetSizePixel());
+
+    Bitmap aBitmap(rBitmapEx.GetBitmap());
+    Bitmap aDarkBitmap(aSize, vcl::PixelFormat::N24_BPP);
+
+    Bitmap::ScopedReadAccess pRead(aBitmap);
+    BitmapScopedWriteAccess pWrite(aDarkBitmap);
+
+    if (pRead && pWrite)
+    {
+        for (sal_Int32 nY = 0; nY < sal_Int32(aSize.Height()); ++nY)
+        {
+            Scanline pScanline = pWrite->GetScanline(nY);
+            Scanline pScanlineRead = pRead->GetScanline(nY);
+            for (sal_Int32 nX = 0; nX < sal_Int32(aSize.Width()); ++nX)
+            {
+                BitmapColor aBmpColor
+                    = pRead->HasPalette()
+                          ? pRead->GetPaletteColor(pRead->GetIndexFromData(pScanlineRead, nX))
+                          : pRead->GetPixelFromData(pScanlineRead, nX);
+                aBmpColor.Invert();
+                basegfx::BColor aBColor(aBmpColor.getBColor());
+                aBColor = basegfx::utils::rgb2hsl(aBColor);
+
+                double fHue = aBColor.getRed();
+                fHue += 180.0;
+
+                while (fHue > 360.0)
+                {
+                    fHue -= 360.0;
+                }
+
+                aBColor.setRed(fHue);
+
+                aBColor = basegfx::utils::hsl2rgb(aBColor);
+                aBmpColor.SetRed((aBColor.getRed() * 255.0) + 0.5);
+                aBmpColor.SetGreen((aBColor.getGreen() * 255.0) + 0.5);
+                aBmpColor.SetBlue((aBColor.getBlue() * 255.0) + 0.5);
+
+                pWrite->SetPixelOnData(pScanline, nX, aBmpColor);
+            }
+        }
+    }
+    pWrite.reset();
+    pRead.reset();
+
+    return BitmapEx(aDarkBitmap, rBitmapEx.GetAlpha());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */