/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

#ifndef _CPPCANVAS_TRANSPARENCYGROUPACTION_HXX
#define _CPPCANVAS_TRANSPARENCYGROUPACTION_HXX

#include <cppcanvas/canvas.hxx>
#include <cppcanvas/renderer.hxx>
#include <action.hxx>

#include <memory> // auto_ptr

namespace basegfx {
    class B2DPoint;
    class B2DVector;
}

class GDIMetaFile;
class Gradient;


/* Definition of internal::TransparencyGroupActionFactory class */

namespace cppcanvas
{
    namespace internal
    {
        struct OutDevState;

        typedef ::std::auto_ptr< GDIMetaFile >  MtfAutoPtr;
        typedef ::std::auto_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.
         */
        class TransparencyGroupActionFactory
        {
        public:
            /** Create new transparency group action.

                @param rGroupMtf
                Metafile that groups all actions to be rendered
                transparent

                @param rParms
                Render parameters

                @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.

                @param nAlpha
                Alpha value, must be in the range [0,1]
             */
            static ActionSharedPtr createTransparencyGroupAction( MtfAutoPtr&                   rGroupMtf,
                                                                  const Renderer::Parameters&   rParms,
                                                                  const ::basegfx::B2DPoint&    rDstPoint,
                                                                  const ::basegfx::B2DVector&   rDstSize,
                                                                  double                        nAlpha,
                                                                  const CanvasSharedPtr&        rCanvas,
                                                                  const OutDevState&            rState );

            /** 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 rParms
                Render parameters

                @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.
             */
            static ActionSharedPtr createTransparencyGroupAction( MtfAutoPtr&                   rGroupMtf,
                                                                  GradientAutoPtr&              rAlphaGradient,
                                                                  const Renderer::Parameters&   rParms,
                                                                  const ::basegfx::B2DPoint&    rDstPoint,
                                                                  const ::basegfx::B2DVector&   rDstSize,
                                                                  const CanvasSharedPtr&        rCanvas,
                                                                  const OutDevState&            rState );

        private:
            // static factory, disable big four
            TransparencyGroupActionFactory();
            ~TransparencyGroupActionFactory();
            TransparencyGroupActionFactory(const TransparencyGroupActionFactory&);
            TransparencyGroupActionFactory& operator=( const TransparencyGroupActionFactory& );
        };
    }
}

#endif /*_CPPCANVAS_TRANSPARENCYGROUPACTION_HXX */