1 files changed, 109 insertions, 0 deletions
diff --git a/drawinglayer/source/primitive2d/unifiedtransparenceprimitive2d.cxx b/drawinglayer/source/primitive2d/unifiedtransparenceprimitive2d.cxx
new file mode 100644
index 000000000..70cfe6750
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+++ b/drawinglayer/source/primitive2d/unifiedtransparenceprimitive2d.cxx
@@ -0,0 +1,109 @@
+/* -*- 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 <drawinglayer/primitive2d/unifiedtransparenceprimitive2d.hxx>
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+#include <basegfx/color/bcolor.hxx>
+#include <drawinglayer/primitive2d/PolyPolygonColorPrimitive2D.hxx>
+#include <drawinglayer/primitive2d/transparenceprimitive2d.hxx>
+#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>
+#include <drawinglayer/primitive2d/polygonprimitive2d.hxx>
+
+
+using namespace com::sun::star;
+
+
+namespace drawinglayer::primitive2d
+{
+        UnifiedTransparencePrimitive2D::UnifiedTransparencePrimitive2D(
+            const Primitive2DContainer& rChildren,
+            double fTransparence)
+        :   GroupPrimitive2D(rChildren),
+            mfTransparence(fTransparence)
+        {
+        }
+
+        bool UnifiedTransparencePrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
+        {
+            if(GroupPrimitive2D::operator==(rPrimitive))
+            {
+                const UnifiedTransparencePrimitive2D& rCompare = static_cast<const UnifiedTransparencePrimitive2D&>(rPrimitive);
+
+                return (getTransparence() == rCompare.getTransparence());
+            }
+
+            return false;
+        }
+
+        basegfx::B2DRange UnifiedTransparencePrimitive2D::getB2DRange(const geometry::ViewInformation2D& rViewInformation) const
+        {
+            // do not use the fallback to decomposition here since for a correct BoundRect we also
+            // need invisible (1.0 == getTransparence()) geometry; these would be deleted in the decomposition
+            return getChildren().getB2DRange( rViewInformation);
+        }
+
+        void UnifiedTransparencePrimitive2D::get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& rViewInformation) const
+        {
+            if(0.0 == getTransparence())
+            {
+                // no transparence used, so just use the content
+                getChildren(rVisitor);
+            }
+            else if(getTransparence() > 0.0 && getTransparence() < 1.0)
+            {
+                // The idea is to create a TransparencePrimitive2D with transparent content using a fill color
+                // corresponding to the transparence value. Problem is that in most systems, the right
+                // and bottom pixel array is not filled when filling polygons, thus this would not
+                // always produce a complete transparent bitmap. There are some solutions:
+
+                // - Grow the used polygon range by one discrete unit in X and Y. This
+                // will make the decomposition view-dependent.
+
+                // - For all filled polygon renderings, draw the polygon outline extra. This
+                // would lead to unwanted side effects when using concatenated polygons.
+
+                // - At this decomposition, add a filled polygon and a hairline polygon. This
+                // solution stays view-independent.
+
+                // I will take the last one here. The small overhead of two primitives will only be
+                // used when UnifiedTransparencePrimitive2D is not handled directly.
+                const basegfx::B2DRange aPolygonRange(getChildren().getB2DRange(rViewInformation));
+                const basegfx::B2DPolygon aPolygon(basegfx::utils::createPolygonFromRect(aPolygonRange));
+                const basegfx::BColor aGray(getTransparence(), getTransparence(), getTransparence());
+                Primitive2DContainer aTransparenceContent(2);
+
+                aTransparenceContent[0] = Primitive2DReference(new PolyPolygonColorPrimitive2D(basegfx::B2DPolyPolygon(aPolygon), aGray));
+                aTransparenceContent[1] = Primitive2DReference(new PolygonHairlinePrimitive2D(aPolygon, aGray));
+
+                // create sub-transparence group with a gray-colored rectangular fill polygon
+                rVisitor.append(new TransparencePrimitive2D(getChildren(), aTransparenceContent));
+            }
+            else
+            {
+                // completely transparent or invalid definition, add nothing
+            }
+        }
+
+        // provide unique ID
+        ImplPrimitive2DIDBlock(UnifiedTransparencePrimitive2D, PRIMITIVE2D_ID_UNIFIEDTRANSPARENCEPRIMITIVE2D)
+
+} // end of namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */