webcoregraphicscontext.h

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/*
 * Copyright (c) 2005 Nokia Corporation, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Nokia Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __WEBCOREGC
#define __WEBCOREGC

#include "bitstd.h"
#include "bitdev.h"

#include "WebCoreWidget.h"

struct TWebCoreSavedContext
    {
    TRect iClippingRect;
    TPoint iOrigin;
    TBool iHasClipping;
    MWebCoreScrollView* iScrollView;
    };

//Wrapper class for CFbsBitGc
class CWebCoreGraphicsContext : public CBase
{

public:
    IMPORT_C static CWebCoreGraphicsContext* NewL(CFbsBitmapDevice* aBitmapDevice, CFbsBitmap* aBitmap, MWebCoreScrollView* aView);
    IMPORT_C static CWebCoreGraphicsContext* NewL(CFbsBitGc& aGc, CFbsBitmap* aBitmap, MWebCoreScrollView* aView);

    virtual ~CWebCoreGraphicsContext();

	CFbsBitmap* ContentBuffer() const
		{
		return iOffscreenBitmap;
		}

    CFbsBitGc& Gc() const
        {
        return *iBitmapContext;
        }

    MWebCoreScrollView& View() const
        {
        return *iScrollView;
        }

    void Resized()
        {
        iBitmapContext->Resized();
        }

    void SetClippingRect(const TRect& aClip)
        {
        iHasClipping = ETrue;
        iClippingRect = aClip;
        iBitmapContext->SetClippingRect(iClippingRect);
        }

    TRect ClippingRect() const
        {
        return iClippingRect;
        }

    TBool HasClipping() const
        {
        return iHasClipping;
        }

    void CancelClipping()
        {
        iHasClipping = EFalse;
        iBitmapContext->CancelClipping();
        }

    void SetOrigin(TPoint aOrigin)
        {
        iOrigin = aOrigin;
        iBitmapContext->SetOrigin(iOrigin);
        }

    TPoint Origin() const
        {
        return iOrigin;
        }

    TWebCoreSavedContext Save()
        {
        TWebCoreSavedContext save;
        save.iClippingRect = iClippingRect;
        save.iHasClipping = iHasClipping;
        save.iOrigin = iOrigin;
        save.iScrollView = iScrollView;
        return save;
        }

    void Restore(const TWebCoreSavedContext& aSave)
        {
        iBitmapContext->SetOrigin(aSave.iOrigin);
        iOrigin = aSave.iOrigin;

        if (!aSave.iHasClipping && iHasClipping)
            {
            iBitmapContext->CancelClipping();
            }
        else
	    {
            iBitmapContext->SetClippingRect(aSave.iClippingRect);
            }

        iClippingRect = aSave.iClippingRect;
        iHasClipping = aSave.iHasClipping;
        }

    void SetView(MWebCoreScrollView& aView)
        {
        iScrollView = &aView;
        }

    protected:

        CWebCoreGraphicsContext(CFbsBitmap* aBitmap, MWebCoreScrollView* aView);

        void ConstructL(CFbsBitmapDevice *aBitmapDevice);
        void ConstructL(CFbsBitGc& aGc);

    private:
        CFbsBitGc* iBitmapContext;
		CFbsBitmap* iOffscreenBitmap;
        MWebCoreScrollView* iScrollView;
        TBool iGcOwned;
        TRect iClippingRect;
        TPoint iOrigin;
        TBool iHasClipping;
};

#endif