1 files changed, 90 insertions, 0 deletions
diff --git a/cppcanvas/source/mtfrenderer/transparencygroupaction.hxx b/cppcanvas/source/mtfrenderer/transparencygroupaction.hxx
new file mode 100644
index 000000000..5b428e07b
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+++ b/cppcanvas/source/mtfrenderer/transparencygroupaction.hxx
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+/* -*- 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 <cppcanvas/canvas.hxx>
+#include <action.hxx>
+
+#include <memory>
+
+namespace basegfx {
+    class B2DPoint;
+    class B2DVector;
+}
+
+class GDIMetaFile;
+class Gradient;
+
+
+/* Definition of internal::TransparencyGroupActionFactory */
+
+namespace cppcanvas
+{
+    namespace internal
+    {
+        struct OutDevState;
+
+        typedef std::unique_ptr< GDIMetaFile >  MtfAutoPtr;
+        typedef std::unique_ptr< Gradient >     GradientAutoPtr;
+
+        /** Transparency group action.
+
+            This action groups a bunch of other actions, to be
+            rendered with the given transparency setting against the
+            background.
+
+            Creates encapsulated converters between GDIMetaFile and
+            XCanvas. The Canvas argument is deliberately placed at the
+            constructor, to force reconstruction of this object for a
+            new canvas. This considerably eases internal state
+            handling, since a lot of the internal state (e.g. fonts,
+            text layout) is Canvas-dependent.
+         */
+        namespace TransparencyGroupActionFactory
+        {
+            /** Create new transparency group action.
+
+                @param rGroupMtf
+                Metafile that groups all actions to be rendered
+                transparent.
+
+                @param rAlphaGradient
+                VCL gradient, to be rendered into the action's alpha
+                channel.
+
+                @param rDstPoint
+                Left, top edge of destination, in current state
+                coordinate system
+
+                @param rDstSize
+                Size of the transparency group object, in current
+                state coordinate system.
+             */
+            std::shared_ptr<Action> createTransparencyGroupAction( MtfAutoPtr&&                  rGroupMtf,
+                                                                  GradientAutoPtr&&             rAlphaGradient,
+                                                                  const ::basegfx::B2DPoint&    rDstPoint,
+                                                                  const ::basegfx::B2DVector&   rDstSize,
+                                                                  const CanvasSharedPtr&        rCanvas,
+                                                                  const OutDevState&            rState );
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */