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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description :
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*
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*/
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#ifndef TSGRAPHICFILESCALINGHANDLER_H
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#define TSGRAPHICFILESCALINGHANDLER_H
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#ifndef __E32SVR_H__
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#define __E32SVR_H__
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#endif
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#ifndef SYMBIAN_ENABLE_PUBLIC_PLATFORM_HEADER_SPLIT
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#define SYMBIAN_ENABLE_PUBLIC_PLATFORM_HEADER_SPLIT
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#endif
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#include <bitmaptransforms.h>
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class CImageDecoder;
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class CFbsBitmap;
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/**
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* Interface to observer contain
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* ImageReadyCallBack function return error code and scaled/resized bitmap.
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*/
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class MImageReadyCallBack
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{
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public:
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virtual void ImageReadyCallBack(TInt error, const CFbsBitmap *bitmap) = 0;
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};
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/**
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* Class to scaling graphic file/s.
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*/
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class CTsGraphicFileScalingHandler : public CActive
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{
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public:
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/**
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* Kind of graphic file scaling.
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* EIgnoreAspectRatio - the file is scaled to size, aspect ratio isn't preserving.
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* EKeepAspectRatio - the file is scaled to a rectangle as large as possible inside size
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* preserving the aspect ratio.
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* EKeepAspectRatioByExpanding - the file is scaled to a rectangle as small as possible outside size
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* preserving the aspect ratio.
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*/
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enum TKindOfScaling
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{
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EIgnoreAspectRatio = 0,
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EKeepAspectRatio = 1,
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EKeepAspectRatioByExpanding = 2,
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};
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private:
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/**
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* Active object current operation.
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*/
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enum TCurrentOperation{
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ENone = 0,
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EConvertBitmapFromFile = 1,
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EScale = 2
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};
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public:
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/**
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* Destructor.
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*/
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IMPORT_C ~CTsGraphicFileScalingHandler();
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/**
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* All constructors initialise active object asynchronous operation
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* by calling ConstructL function.
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* 1st group - decoding and scaling.
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* 2nd group - scaling.
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*/
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/**
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* 1st group.
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* Exported from dll constructors for activation graphic file scaling.
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* aNotify - reference to observer implementation.
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* aFs - reference to file server session.
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* aFileName - path to graphic file.
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* aMimeType - mime type of graphic file.
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* aNewSize - new size of output graphic file.
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* aKindOfScaling - kind of graphic file scaling described above.
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*/
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IMPORT_C static CTsGraphicFileScalingHandler* NewL(MImageReadyCallBack &aNotify,
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RFs &aFs,
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const TDesC &aFileName,
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const TDesC8& aMimeType,
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const TSize &aNewSize,
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TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio);
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IMPORT_C static CTsGraphicFileScalingHandler* NewLC(MImageReadyCallBack &aNotify,
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RFs &aFs,
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const TDesC &aFileName,
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const TDesC8& aMimeType,
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const TSize &aNewSize,
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TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio);
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/**
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* 2nd group.
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* Exported from dll constructors for activation graphic file scaling.
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* aNotify - reference to observer implementation.
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* aImputFbsBitmap - reference to pattern CFbsBitmap.
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* aNewSize - new size of output graphic file.
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* aKindOfScaling - kind of graphic file scaling described above.
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*/
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IMPORT_C static CTsGraphicFileScalingHandler* NewL(MImageReadyCallBack &aNotify,
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const CFbsBitmap &aImputFbsBitmap,
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const TSize &aNewSize,
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TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio);
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IMPORT_C static CTsGraphicFileScalingHandler* NewLC(MImageReadyCallBack &aNotify,
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const CFbsBitmap &aImputFbsBitmap,
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const TSize &aNewSize,
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TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio);
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protected:
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/**
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* Cancels the wait for completion of an outstanding request.
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*/
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void DoCancel();
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/**
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* Handles an active object’s request completion event.
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*/
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void RunL();
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/**
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* Handles a leave occurring in the request completion event handler RunL().
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*/
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TInt RunError(TInt);
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private:
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/**
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* Functions construct active objest instance and made asynchronous operation/s.
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* Parameters - the same meaning as in appropriate NewL/NewLC functions.
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*/
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void ConstructL(RFs &aFs, const TDesC &aFileName, const TDesC8& aMimeType);
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void ConstructL(const CFbsBitmap &aImputFbsBitmap);
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/**
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* Private constructor.
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* Parameters - the same meaning as in appropriate NewL/NewLC functions.
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*/
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CTsGraphicFileScalingHandler(MImageReadyCallBack &aNotify,
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const TSize &aNewSize,
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TKindOfScaling aKindOfScaling = CTsGraphicFileScalingHandler::EIgnoreAspectRatio);
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/**
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* Action to made before decoding graphic file operation.
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* Parameters - the same meaning as in appropriate NewL/NewLC functions.
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*/
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void DecodingOperationL(RFs &aFs, const TDesC &aFileName, const TDesC8& aMimeType);
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/**
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* Action to made before scaling graphic file operation.
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*/
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void ScalingOperationL();
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/**
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* Algorithm to determine output bitmap (returned in ImageReadyCallBack) size
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* after scaling operation.
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*/
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TSize NewSizeToScalingOperation();
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/**
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* Fix for TDisplayMode == EColor16MAP not supported by scaling operation!
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* ! ! ! ADD OTHER NOT SUPPORTED DISPLAY MODES ! ! !
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*/
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void FixForDisplayModeNotSupportedByScalingOperation();
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private:
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/**
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* Reference to observer implementation - return error code and output bitmap.
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*/
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MImageReadyCallBack &mNotify;
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/**
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* Pointer to decoder used by decoding graphic file algorithm.
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*/
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CImageDecoder *mImageDecoder;
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/**
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* Pointer to input bitmap - before decoding/scaling operation/s.
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*/
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CFbsBitmap *mInputBitmap;
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/**
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* Pointer to output bitmap - returned in mNotify object.
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*/
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CFbsBitmap *mOutputBitmap;
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/**
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* Pointer to CBitmapScaler calss used by scaling graphic file algorithm.
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*/
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CBitmapScaler *mBitmapScaler;
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/**
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* New size of output graphic file.
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*/
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TSize mNewSize;
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/**
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* Kind of graphic file scaling described above.
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*/
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TBool mKindOfScaling;
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/**
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* Active object current operation.
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*/
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TCurrentOperation mCurrentOperation;
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};
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#endif // TSGRAPHICFILESCALINGHANDLER_H
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