Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

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

1 files changed, 115 insertions, 0 deletions

diff --git a/include/drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx b/include/drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx
new file mode 100644
index 000000000..8087a6544
--- /dev/null
+++ b/include/drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx
@@ -0,0 +1,115 @@
+/* -*- 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/Primitive2DContainer.hxx>
+#include <drawinglayer/primitive2d/baseprimitive2d.hxx>
+
+namespace drawinglayer::geometry
+{
+class ViewInformation2D;
+}
+
+namespace drawinglayer::primitive2d
+{
+/** BufferedDecompositionPrimitive2D class
+
+    Baseclass for all C++ implementations of css::graphic::XPrimitive2D
+    which want to buffer the decomposition result
+
+    Buffering the decomposition is the most-used buffering and is thus used my most
+    primitive implementations which support a decomposition as base class.
+
+    The buffering is done by holding the last decomposition in the local parameter
+    maBuffered2DDecomposition. The default implementation of get2DDecomposition checks
+    if maBuffered2DDecomposition is empty. If yes, it uses create2DDecomposition
+    to create the content. In all cases, maBuffered2DDecomposition is returned.
+
+    For view-dependent primitives derived from Primitive2DBufferDecomposition more needs
+    to be done when the decomposition depends on parts of the parameter ViewInformation2D.
+    This defines a standard method for processing these:
+
+    Implement a view-dependent get2DDecomposition doing the following steps:
+    (a) Locally extract needed parameters from ViewInformation2D to new, local parameters
+        (this may be a complete local copy of ViewInformation2D)
+    (b) If a buffered decomposition exists, ckeck if one of the new local parameters
+        differs from the corresponding locally remembered (as member) ones. If yes,
+        clear maBuffered2DDecomposition
+    (d) call baseclass::get2DDecomposition which will use create2DDecomposition
+        to fill maBuffered2DDecomposition if it's empty
+    (e) copy the new local parameters to the corresponding locally remembered ones
+        to identify if a new decomposition is needed at the next call
+    (f) return maBuffered2DDecomposition
+ */
+class DRAWINGLAYERCORE_DLLPUBLIC BufferedDecompositionPrimitive2D : public BasePrimitive2D
+{
+private:
+    /// a sequence used for buffering the last create2DDecomposition() result
+    Primitive2DContainer maBuffered2DDecomposition;
+
+    /// When a shadow wraps a list of primitives, this primitive wants to influence the transparency
+    /// of the shadow.
+    sal_uInt16 mnTransparenceForShadow = 0;
+
+protected:
+    /** access methods to maBuffered2DDecomposition. The usage of this methods may allow
+        later thread-safe stuff to be added if needed. Only to be used by getDecomposition()
+        implementations for buffering the last decomposition.
+     */
+    const Primitive2DContainer& getBuffered2DDecomposition() const
+    {
+        return maBuffered2DDecomposition;
+    }
+    void setBuffered2DDecomposition(Primitive2DContainer&& rNew)
+    {
+        maBuffered2DDecomposition = std::move(rNew);
+    }
+
+    /** 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 = 0;
+
+public:
+    // constructor/destructor
+    BufferedDecompositionPrimitive2D();
+
+    /** The getDecomposition default implementation will on demand use create2DDecomposition() if
+        maBuffered2DDecomposition is empty. It will set maBuffered2DDecomposition to this obtained decomposition
+        to buffer it. If the decomposition is also ViewInformation2D-dependent, this method needs to be
+        overridden and the ViewInformation2D for the last decomposition need to be remembered, too, and
+        be used in the next call to decide if the buffered decomposition may be reused or not.
+     */
+    virtual void
+    get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor,
+                       const geometry::ViewInformation2D& rViewInformation) const override;
+
+    void setTransparenceForShadow(sal_uInt16 nTransparenceForShadow)
+    {
+        mnTransparenceForShadow = nTransparenceForShadow;
+    }
+
+    sal_uInt16 getTransparenceForShadow() const { return mnTransparenceForShadow; }
+};
+
+} // end of namespace drawinglayer::primitive2d
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */