imagemanipadapter.h

series60 应用程序开发的源代码 series60 应用程序开发的源代码

#ifndef IMAGEMANIPADAPTER_H
#define IMAGEMANIPADAPTER_H

// System Includes
#include <e32base.h>
#include <MdaImageConverter.h>    // MMdaImageUtilObserver
#include <gdi.h>                // TDisplayMode

// User includes
#include "ImageModel.h" // MImageModel


//FORWARD DECLARATION
class CMdaImageFileToBitmapUtility;
class CMdaImageBitmapToFileUtility;
class CMdaBitmapRotator;
class CMdaBitmapScaler;
class CFbsBitmap;
class MMultimediaController;

/**
 *
 * @class    CImageManipAdapter ImageManipAdapter.h
 * @brief    This is an Adapter class (see a design patterns book) which
 * acts as a wrapper around the functionality of the Media Server. The example
 * illustrates some of the core concepts required in understanding
 * image conversion/manipulation on Series 60 v1.x.
 *
 * Copyright (c) EMCC Software Ltd 2003
 * @version    1.0
 *
 */
class CImageManipAdapter : public CBase, public MMdaImageUtilObserver, public MImageModel //this is from Media Server
{
public:    // Construction and destruction.
    static CImageManipAdapter* NewL(MMultimediaController& aMultimediaController, TDisplayMode aDeviceDisplayMode);
    static CImageManipAdapter* NewLC(MMultimediaController& aMultimediaController, TDisplayMode aDeviceDisplayMode);
    virtual ~CImageManipAdapter();

public:    // Member functions
    void HandleCommandL(TInt aCommand);

public:    // From MImageModel
    CFbsBitmap& Image() const;

protected:    // From MMdaImageUtilObserver
    // Observer functions to inform client code that the current
    // asynchronous step within the manipulation process has completed
    void MiuoConvertComplete(TInt aError);
    void MiuoCreateComplete(TInt aError);
    void MiuoOpenComplete(TInt aError);

private:
    // enumeration to keep track of current manipulation
    enum TImageManipState
    {
        EDecode = 0,
        EEncode,
        ERotating,
        EScaling,
        EDoNothing
    };

    // enumeration to decide whether to enlarge or shrink image
    enum TScaleState
    {
        EScaleDown = 0,
        EScaleUp
    };

private:    // Construction
    void ConstructL();
    CImageManipAdapter(MMultimediaController& aMultimediaController, TDisplayMode aDeviceDisplayMode);

private:    // Member Functions.
    // Image converstion functions
    void DecodeOpenL();
    void EncodeOpenL();
    void DecodeConvertL();
    void EncodeConvertL();

    // Image rotation Functions
    void Rotate90L();
    void Rotate180L();
    void Rotate270L();

    // Image scaling function
    void ScaleImageL();

    // Rest image
    void ResetImageL();

private: // Member data
    // From Media Server
    CMdaImageFileToBitmapUtility* iFileToBitmap;
    CMdaImageBitmapToFileUtility* iBitmapToFile;
    CMdaBitmapRotator* iRotator;
    CMdaBitmapScaler* iScaler;
    TMdaJfifClipFormat* iJpgFormat; // used to save as a jpg

    CFbsBitmap* iImage;

    MMultimediaController& iMultimediaController;

    TImageManipState iManipulationState;
    TScaleState iScaleState;

    TDisplayMode iDeviceDisplayMode; // used to store device display mode
};

#endif