www.pudn.com > wcore.rar > WebCoreGraphicsContext.h

/* 
 * 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