libreoffice/canvas/source/tools/surfaceproxy.hxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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
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 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
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 */

#ifndef INCLUDED_CANVAS_SOURCE_TOOLS_SURFACEPROXY_HXX
#define INCLUDED_CANVAS_SOURCE_TOOLS_SURFACEPROXY_HXX

#include <canvas/rendering/isurfaceproxy.hxx>
#include <canvas/rendering/icolorbuffer.hxx>

#include "pagemanager.hxx"
#include "surface.hxx"

namespace canvas
{
    /** Definition of the surface proxy class.

        Surface proxies are the connection between *one* source image
        and *one or more* hardware surfaces (or textures).  in a
        logical structure surface proxies represent solely this
        dependeny plus some simple cache management.
    */
    class SurfaceProxy : public ISurfaceProxy
    {
    public:

        SurfaceProxy( const canvas::IColorBufferSharedPtr& pBuffer,
                      const PageManagerSharedPtr &pPageManager );

        // ISurfaceProxy interface
        virtual void setColorBufferDirty() SAL_OVERRIDE;

        /** Render the surface content to screen.

            @param fAlpha
            Overall alpha for content

            @param rPos
            Output position

            @param rTransform
            Output transformation (does not affect output position)
        */
        virtual bool draw( double                         fAlpha,
                           const ::basegfx::B2DPoint&     rPos,
                           const ::basegfx::B2DHomMatrix& rTransform ) SAL_OVERRIDE;

        /** Render the surface content to screen.

            @param fAlpha
            Overall alpha for content

            @param rPos
            Output position

            @param rArea
            Subset of the surface to render. Coordinate system are
            surface area pixel, given area will be clipped to the
            surface bounds.

            @param rTransform
            Output transformation (does not affect output position)
        */
        virtual bool draw( double                         fAlpha,
                           const ::basegfx::B2DPoint&     rPos,
                           const ::basegfx::B2DRange&     rArea,
                           const ::basegfx::B2DHomMatrix& rTransform ) SAL_OVERRIDE;

        /** Render the surface content to screen.

            @param fAlpha
            Overall alpha for content

            @param rPos
            Output position

            @param rClipPoly
            Clip polygon for the surface. The clip polygon is also
            subject to the output transformation.

            @param rTransform
            Output transformation (does not affect output position)
        */
        virtual bool draw( double                           fAlpha,
                           const ::basegfx::B2DPoint&       rPos,
                           const ::basegfx::B2DPolyPolygon& rClipPoly,
                           const ::basegfx::B2DHomMatrix&   rTransform ) SAL_OVERRIDE;

    private:
        PageManagerSharedPtr          mpPageManager;

        // the pagemanager will distribute the image
        // to one or more surfaces, this is why we
        // need a list here.
        std::vector<SurfaceSharedPtr> maSurfaceList;

        // pointer to the source of image data
        // which always is stored in system memory,
        // 32bit rgba and can have any size.
        canvas::IColorBufferSharedPtr mpBuffer;
    };

    typedef ::boost::shared_ptr< SurfaceProxy > SurfaceProxySharedPtr;
}

#endif

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