1 files changed, 100 insertions, 0 deletions
diff --git a/include/drawinglayer/primitive2d/shadowprimitive2d.hxx b/include/drawinglayer/primitive2d/shadowprimitive2d.hxx
new file mode 100644
index 0000000000..39dcbca9fa
--- /dev/null
+++ b/include/drawinglayer/primitive2d/shadowprimitive2d.hxx
@@ -0,0 +1,100 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <drawinglayer/drawinglayerdllapi.h>
+
+#include <drawinglayer/primitive2d/BufferedDecompositionGroupPrimitive2D.hxx>
+#include <basegfx/color/bcolor.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+
+namespace drawinglayer::primitive2d
+{
+/** ShadowPrimitive2D class
+
+            This primitive defines a generic shadow geometry construction
+            for 2D objects. It decomposes to a TransformPrimitive2D embedded
+            into a ModifiedColorPrimitive2D.
+
+            It's for primitive usage convenience, so that not everyone has
+            to implement the generic shadow construction by himself.
+
+            The same geometry as sequence of primitives is used as geometry and
+            as shadow. Since these are RefCounted Uno-Api objects, no extra objects
+            are needed for the shadow itself; all the local decompositions of the
+            original geometry can be reused from the renderer for shadow visualisation.
+        */
+class DRAWINGLAYER_DLLPUBLIC ShadowPrimitive2D final : public BufferedDecompositionGroupPrimitive2D
+{
+private:
+    /// the shadow transformation, normally just an offset
+    basegfx::B2DHomMatrix maShadowTransform;
+
+    /// the shadow color to which all geometry is to be forced
+    basegfx::BColor maShadowColor;
+
+    /// the blur radius of the shadow
+    double mfShadowBlur;
+
+    /// last used DiscreteBlurRadius and ClippedRange
+    double mfLastDiscreteBlurRadius;
+    basegfx::B2DRange maLastClippedRange;
+
+    /// helpers
+    void getFullyEmbeddedShadowPrimitives(Primitive2DContainer& rContainer) const;
+    bool prepareValuesAndcheckValidity(basegfx::B2DRange& rRange, basegfx::B2DRange& rClippedRange,
+                                       basegfx::B2DVector& rDiscreteSize,
+                                       double& rfDiscreteBlurRadius,
+                                       const geometry::ViewInformation2D& rViewInformation) const;
+
+protected:
+    /** method which is to be used to implement the local decomposition of a 2D primitive. */
+    virtual void
+    create2DDecomposition(Primitive2DContainer& rContainer,
+                          const geometry::ViewInformation2D& rViewInformation) const override;
+
+public:
+    /// constructor
+    ShadowPrimitive2D(basegfx::B2DHomMatrix aShadowTransform, const basegfx::BColor& rShadowColor,
+                      double fShadowBlur, Primitive2DContainer&& aChildren);
+
+    /// data read access
+    const basegfx::B2DHomMatrix& getShadowTransform() const { return maShadowTransform; }
+    const basegfx::BColor& getShadowColor() const { return maShadowColor; }
+    double getShadowBlur() const { return mfShadowBlur; }
+
+    /// compare operator
+    virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;
+
+    /// get range
+    virtual basegfx::B2DRange
+    getB2DRange(const geometry::ViewInformation2D& rViewInformation) const override;
+
+    ///  create decomposition
+    virtual void
+    get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor,
+                       const geometry::ViewInformation2D& rViewInformation) const override;
+
+    /// provide unique ID
+    virtual sal_uInt32 getPrimitive2DID() const override;
+};
+} // end of namespace drawinglayer::primitive2d
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */