cpictureloader.cpp

一个基于symbian s60 3rd 的3D汽车游戏演示程序,模拟器上编译通过。

   /*
============================================================================
    * Name : CPictureLoader.cpp
    * Part of : Example3D
    * Description : Definition of CPictureLoader
    * Copyright (c) 2007 Nokia Corporation
============================================================================
    */

// INCLUDES
#include "CPictureLoader.h"
#include <eikenv.h>
#include <eikappui.h>
#include <eikapp.h>

#include <imageConversion.h>

// MEMBER FUNCTIONS
CPictureLoader* CPictureLoader::NewL()
    {
    CPictureLoader* self = new( ELeave )CPictureLoader();
    CleanupStack::PushL( self );
    self->ConstructL();
    CleanupStack::Pop( self );
    return self;
    }

CPictureLoader::~CPictureLoader()
    {

    iFs.Close();
    if(iBitmap)
        delete iBitmap;
    Cancel();
    }

void CPictureLoader::ConstructL()
    {
    CActiveScheduler::Add(this);
    iBitmap = new (ELeave) CFbsBitmap;
    
    User::LeaveIfError(iFs.Connect());
    iFs.PrivatePath(iPath);
 //   fs.Close();
#ifndef __WINS__
    TFileName appFullName = CEikonEnv::Static()->EikAppUi()->Application()->AppFullName();
    TParse parse;
    parse.Set( appFullName, NULL, NULL);
    iPath.Insert(0, parse.Drive());
#endif
    }

CPictureLoader::CPictureLoader()
: CActive(CActive::EPriorityStandard)
    {
    }

TBitmap CPictureLoader::LoadL( const TFileName& aFileName, TDisplayMode aDisplayMode)
    {
    TFileName filename( iPath );
    filename.Append( aFileName );
    
    iDisplayMode = aDisplayMode;    
    
    TBuf8<50> mimeType;
    CImageDecoder::GetMimeTypeFileL(iFs, filename, mimeType);
    CImageDecoder* imageDecoder = CImageDecoder::FileNewL(iFs,filename, mimeType );

    iBitmap->Create( imageDecoder->FrameInfo().iOverallSizeInPixels, iDisplayMode);

    iState = EConverting;
    imageDecoder->Convert(&iStatus, *iBitmap);
    SetActive();
    iWait.Start();
    delete imageDecoder;
    return SetPixels();
    }


TBitmap CPictureLoader::SetPixels()
    {
    TBitmap bm;

    bm.iSize = iBitmap->SizeInPixels(); 

    TInt pixels = bm.iSize.iWidth * bm.iSize.iHeight;

    // this code assumed that pixels are always 16 bit
    if (iDisplayMode == EColor16MU)
        {
        // 32 bit pixels - convert to 24 bits, ignore alpha channel
        bm.iData = new( ELeave )TUint8[ pixels * 3 ];
        bm.iMode = EColor16M;

        iBitmap->LockHeap(EFalse);

        TUint8* source = (TUint8*)iBitmap->DataAddress();
        TUint8* destination = (TUint8*)bm.iData;

        TInt i;
        for (i=0; i<pixels; i++)
            {
            destination[0] = source[2];
            destination[1] = source[1];
            destination[2] = source[0];

            destination += 3;
            source += 4;
            }
        iBitmap->UnlockHeap(EFalse);
        }
    else
        {
        // 16 bit pixels
        bm.iData = new( ELeave )TUint16[ pixels ];
        bm.iMode = iDisplayMode;
        
        TInt y;
        for( y=0; y<bm.iSize.iHeight; y++ )
            {
            TPtr8 ydata( ((TUint8*)bm.iData) + y * bm.iSize.iWidth * 2, bm.iSize.iWidth * 2 );
            iBitmap->GetScanLine( ydata, TPoint( 0, y ), bm.iSize.iWidth, iDisplayMode );
            }
        }
    
    
    Cancel();
    
    return bm;
    }

void CPictureLoader::RunL()
    {
    if (iState == EConverting)
        {
        iWait.AsyncStop();
        iState = EIdle;
        }
    }

void CPictureLoader::DoCancel()
    {   
    if(iBitmap)
        delete iBitmap;
    iBitmap = NULL;
    }