Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/drawinglayer/source/primitive2d/GlowSoftEgdeShadowTools.cxx b/drawinglayer/source/primitive2d/GlowSoftEgdeShadowTools.cxx
new file mode 100644
index 0000000000..e1dcac4213
--- /dev/null
+++ b/drawinglayer/source/primitive2d/GlowSoftEgdeShadowTools.cxx
@@ -0,0 +1,98 @@
+/* -*- 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "GlowSoftEgdeShadowTools.hxx"
+#include <vcl/bitmapex.hxx>
+#include <vcl/BitmapFilter.hxx>
+#include <vcl/BitmapBasicMorphologyFilter.hxx>
+#include <vcl/BitmapFilterStackBlur.hxx>
+
+namespace drawinglayer::primitive2d
+{
+/* Returns 8-bit alpha mask created from passed mask.
+
+   Negative fErodeDilateRadius values mean erode, positive - dilate.
+   nTransparency defines minimal transparency level.
+*/
+AlphaMask ProcessAndBlurAlphaMask(const AlphaMask& rMask, double fErodeDilateRadius,
+                                  double fBlurRadius, sal_uInt8 nTransparency, bool bConvertTo1Bit)
+{
+    // Invert it to operate in the transparency domain. Trying to update this method to
+    // work in the alpha domain is fraught with hazards.
+    AlphaMask tmpMask = rMask;
+    tmpMask.Invert();
+
+    // Only completely white pixels on the initial mask must be considered for transparency. Any
+    // other color must be treated as black. This creates 1-bit B&W bitmap.
+    BitmapEx mask(bConvertTo1Bit ? tmpMask.GetBitmap().CreateMask(COL_WHITE) : tmpMask.GetBitmap());
+
+    // Scaling down increases performance without noticeable quality loss. Additionally,
+    // current blur implementation can only handle blur radius between 2 and 254.
+    Size aSize = mask.GetSizePixel();
+    double fScale = 1.0;
+    while (fBlurRadius > 254 || aSize.Height() > 1000 || aSize.Width() > 1000)
+    {
+        fScale /= 2;
+        fBlurRadius /= 2;
+        fErodeDilateRadius /= 2;
+        aSize /= 2;
+    }
+
+    // BmpScaleFlag::NearestNeighbor is important for following color replacement
+    mask.Scale(fScale, fScale, BmpScaleFlag::NearestNeighbor);
+
+    if (fErodeDilateRadius > 0)
+        BitmapFilter::Filter(mask, BitmapDilateFilter(fErodeDilateRadius));
+    else if (fErodeDilateRadius < 0)
+        BitmapFilter::Filter(mask, BitmapErodeFilter(-fErodeDilateRadius, 0xFF));
+
+    if (nTransparency)
+    {
+        const Color aTransparency(nTransparency, nTransparency, nTransparency);
+        mask.Replace(COL_BLACK, aTransparency);
+    }
+
+    // We need 8-bit grey mask for blurring
+    mask.Convert(BmpConversion::N8BitGreys);
+
+    // calculate blurry effect
+    BitmapFilter::Filter(mask, BitmapFilterStackBlur(fBlurRadius));
+
+    mask.Scale(rMask.GetSizePixel());
+
+    // And switch to the alpha domain.
+    mask.Invert();
+
+    return AlphaMask(mask.GetBitmap());
+}
+
+drawinglayer::geometry::ViewInformation2D
+expandB2DRangeAtViewInformation2D(const drawinglayer::geometry::ViewInformation2D& rViewInfo,
+                                  double nAmount)
+{
+    drawinglayer::geometry::ViewInformation2D aRetval(rViewInfo);
+    basegfx::B2DRange viewport(rViewInfo.getViewport());
+    viewport.grow(nAmount);
+    aRetval.setViewport(viewport);
+    return aRetval;
+}
+
+} // end of namespace drawinglayer::primitive2d
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */