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examples/ForumNokia/CameraExample/src/CameraWrapperExampleAppView.cpp

/*
 * Copyright (c) 2009 Nokia Corporation.
 */

// INCLUDE FILES
#include <coemain.h>
#include <eikon.hrh>
#include <aknutils.h>
#include <pathinfo.h>
#include <f32file.h>
#include <BAUTILS.H>
#include "CameraWrapperExampleAppView.h"
#include "CameraWrapperExampleAppUi.h"


// ============================ MEMBER FUNCTIONS ===============================

CCameraWrapperExampleAppView* CCameraWrapperExampleAppView::NewL (const TRect& aRect )
    {
    CCameraWrapperExampleAppView* self = CCameraWrapperExampleAppView::NewLC (aRect );
    CleanupStack::Pop (self );
    return self;
    }

CCameraWrapperExampleAppView* CCameraWrapperExampleAppView::NewLC (const TRect& aRect )
    {
    CCameraWrapperExampleAppView* self = new (ELeave) CCameraWrapperExampleAppView;
    CleanupStack::PushL (self );
    self->ConstructL (aRect );
    return self;
    }

void CCameraWrapperExampleAppView::ConstructL (const TRect& aRect )
    {
    // Create a window for this application view
    CreateWindowL ();

    iTitleFont = AknLayoutUtils::FontFromId(EAknLogicalFontPrimarySmallFont);
    
    iAppUi = static_cast<CCameraWrapperExampleAppUi*>(iEikonEnv->EikAppUi());
    
    // Set the windows size
    SetRect (aRect );
    
    // Activate the window, which makes it ready to be drawn
    ActivateL ();
    }

CCameraWrapperExampleAppView::CCameraWrapperExampleAppView ()
    {
    }

CCameraWrapperExampleAppView::~CCameraWrapperExampleAppView ()
    {
    if (iCameraWrapper)
        {
        iCameraWrapper->ReleaseAndPowerOff();
        }
    delete iCameraWrapper;
    delete iData;
    
    ReleaseBackBuffer();
    }

TKeyResponse CCameraWrapperExampleAppView::OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType)
    {
    switch ( aKeyEvent.iCode )
        {
        case EKeyOK:
        case EStdKeyDevice3:
            {
            // Capture picture
            iCameraShutterFocusing = EFalse;
            StartFocusing();
            return EKeyWasConsumed;
            }
        case EKeyUpArrow:
            {
            if (iCameraWrapper->State() == CCameraEngine::EEngineViewFinding)
                {
                iCameraWrapper->AdjustDigitalZoom(ETrue);
                }
            return EKeyWasConsumed;
            }
        case EKeyDownArrow:
            {
            if (iCameraWrapper->State() == CCameraEngine::EEngineViewFinding)
                {
                iCameraWrapper->AdjustDigitalZoom(EFalse);
                }
            return EKeyWasConsumed;
            }
        default:
            {
            break;
            }
        };
    
    
    
    #ifdef ENABLE_CAMERA_SHUTTER
    // Camera shutter autofocus
    switch ( aKeyEvent.iScanCode )
        {
        case KStdKeyCameraFocus:
        case KStdKeyCameraFocus2:
            {
            // Camera shutter autofocus
            if (aType == EEventKeyDown)
                {
                if (!iAppUi->IsBackCBA())
                    {
                    iCameraShutterFocusing = ETrue;
                    StartFocusing();
                    }
                return EKeyWasConsumed;
                }
            else if (aType == EEventKeyUp)
                {
                // Camera state can be EEngineIdle or EEngineFocusing
                if (!iAppUi->IsBackCBA() && (iCameraWrapper->State() == CCameraEngine::EEngineFocusing ||
                        iCameraWrapper->State() == CCameraEngine::EEngineIdle))
                    {
                    iCameraWrapper->FocusCancel();
                    CancelCapturedPicture();
                    iAppUi->UseOptionsExitCbaL();
                    }
                return EKeyWasConsumed;
                }
            }
        default:
            {
            break;
            }
        };
    #endif
    
    return EKeyWasNotConsumed;
    }

void CCameraWrapperExampleAppView::CancelCapturedPicture(TBool aCleanTexts)
    {
     if (iCameraWrapper && iCameraWrapper->State() == CCameraEngine::EEngineIdle)
         {
         TRAPD(err,iCameraWrapper->StartViewFinderL(iViewFinderSize));
         if (aCleanTexts)
             {
             if (err)
                 {
                 SetError(_L("Camera viewfinder error %d"), err);                    
                 }
             else
                 {
                 SetTitle(_L("Camera viewfinder"));
                 }            
             }
        }
    }

void CCameraWrapperExampleAppView::Draw(const TRect& /*aRect*/) const
    {
    CWindowGc& gc = SystemGc ();
    
    // Draw backbuffer that has camera picture
    gc.BitBlt(TPoint(0, 0), iBackBuffer);
    
    // Draw texts
    DrawTexts(gc);
    
    // Focus rect
    if (iCameraWrapper && iCameraWrapper->State() == CCameraEngine::EEngineFocusing)
        {
        gc.SetPenColor(KRgbWhite);
        gc.DrawRect(iFocusRect);
        }
    }

void CCameraWrapperExampleAppView::DrawTexts(CWindowGc& gc) const
    {
    if (iTitle.Length()>0)
        {
        TRect rect(Rect());
        gc.SetPenColor(KRgbWhite);
        gc.UseFont(iTitleFont);
        gc.DrawText(iTitle, rect, rect.Height()/10, CGraphicsContext::ECenter );
        gc.DiscardFont();
        }
    }

void CCameraWrapperExampleAppView::SizeChanged()
    {
    // Create camera wrapper class here because
    // whole camera wrapper and all handles have to reset
    // while orientatio of the application changes.
    if (iCameraWrapper)
        {
        // Power off camera if it is on
        iCameraWrapper->StopViewFinder();
        iCameraWrapper->ReleaseAndPowerOff();
        delete iCameraWrapper; iCameraWrapper = NULL;
        }
    TInt camErr(KErrNotSupported);
    if(CCameraEngine::CamerasAvailable() > 0)
      {
      TRAP(camErr, iCameraWrapper = CCameraEngine::NewL(0,0,this));
      }

    // iViewFinderSize is picture size for viewfinder.
    // iCaptureSize is picture size for capturing picture.
    // We want fill whole screen
    if (Rect().Size().iWidth > Rect().Size().iHeight)
        {
        iViewFinderSize = TSize(Rect().Size().iWidth,Rect().Size().iWidth);
        iCaptureSize = TSize(1280,960); // Captured picture size
        }
    else
        {
        iViewFinderSize = TSize(Rect().Size().iHeight,Rect().Size().iHeight);
        iCaptureSize = TSize(1280,960); // Captured picture size
        }

    // Focus rectangle
    iFocusRect = Rect();
    iFocusRect.Shrink(Rect().Size().iWidth/4, Rect().Size().iHeight/4);
    
    // Create back buffer where recieved camera pictures are copied
    ReleaseBackBuffer();
    CreateBackBufferL();
    
    // Power on camera, start viewfinder when MceoCameraReady() received
    if(camErr == KErrNone)
      {
      iCameraWrapper->ReserveAndPowerOn();    
      SetTitle(_L("Camera power on"));
      }
    else
      {
      SetTitle(_L("no camera found"));
      }
    }

void CCameraWrapperExampleAppView::HandlePointerEventL (
        const TPointerEvent& aPointerEvent )
    {
    if (aPointerEvent.iType == TPointerEvent::EButton1Down)
        {
        // When pointing to screen camera capture picture
        if (!iAppUi->IsBackCBA() && 
                iCameraWrapper && iCameraWrapper->State() == CCameraEngine::EEngineViewFinding)
            {
            iCameraShutterFocusing = EFalse;
            StartFocusing();
            }
        // After captureing, when pointing again to screen camera
        // start viewfinder again
        else if (!iAppUi->IsBackCBA() &&
                iCameraWrapper && iCameraWrapper->State() == CCameraEngine::EEngineIdle)
            {
            CancelCapturedPicture();
            iAppUi->UseOptionsExitCbaL();
            }
        }
    }

void CCameraWrapperExampleAppView::SetTitle(const TDesC& aTitle)
    {
    iTitle.Copy(aTitle);
    DrawNow();
    }

void CCameraWrapperExampleAppView::SetError( const TDesC& aMsg, TInt aVal )
    {
    iTitle.Format(aMsg, aVal);
    DrawNow();
    }

void CCameraWrapperExampleAppView::SetError( const TDesC& aMsg, TInt aVal1, TInt aVal2 )
    {
    iTitle.Format(aMsg, aVal1, aVal2);
    DrawNow();
    }

void CCameraWrapperExampleAppView::CreateBackBufferL()
    {
    // create back buffer bitmap
    iBackBuffer = new (ELeave) CFbsBitmap;
    
    User::LeaveIfError( iBackBuffer->Create(Size(),EColor16M));
    
    // create back buffer graphics context
    iBackBufferDevice = CFbsBitmapDevice::NewL(iBackBuffer);
    User::LeaveIfError(iBackBufferDevice->CreateContext(iBackBufferContext));
    iBackBufferContext->SetPenStyle(CGraphicsContext::ESolidPen);
    
    iBackBufferContext->SetBrushColor(KRgbBlack);
    iBackBufferContext->Clear();
    }

void CCameraWrapperExampleAppView::ReleaseBackBuffer()
    {
    if (iBackBufferContext)
        {
        delete iBackBufferContext;
        iBackBufferContext = NULL;
        }
    if (iBackBufferDevice)
        {
        delete iBackBufferDevice;
        iBackBufferDevice = NULL;
        }
    if (iBackBuffer)
        {
        delete iBackBuffer;
        iBackBuffer = NULL;
        }
    }

void CCameraWrapperExampleAppView::MceoCameraReady()
    {
    iAppUi->UseOptionsExitCbaL();
    
    if (iCameraWrapper->State() == CCameraEngine::EEngineIdle)
        {
        // Prepare camera
        TRAPD(err,iCameraWrapper->PrepareL(iCaptureSize));
        if (err)
            {
            SetError(_L("Camera prepare error %d"), err);
            return;
            }
        
        // Start viewfinder. Viewfinder pictures starts coming into MceoViewFinderFrameReady();
        TRAPD(err2,iCameraWrapper->StartViewFinderL(iViewFinderSize));
        if (err2)
            {
            SetError(_L("Camera start viewfinder error %d"), err2);
            return;
            }

        SetTitle(_L("Camera viewfinder"));
        }
    }

void CCameraWrapperExampleAppView::Capture()
    {
    // This method is called when picture is focused with camera shutter and pressed whole down
    // as taking a new picture
    #ifdef ENABLE_CAMERA_SHUTTER
    if (iCameraWrapper && !iAppUi->IsBackCBA())
        {
        // No focus supported
        SetTitle(_L("Capturing picture"));
        iCameraWrapper->StopViewFinder();
        TRAPD(err,iCameraWrapper->CaptureL());
        if (err)
            {
            SetError(_L("Camera capture error %d"), err);                    
            }
        }
    #endif
    }

void CCameraWrapperExampleAppView::StartFocusing()
    {
    if (iCameraWrapper && iCameraWrapper->State() == CCameraEngine::EEngineViewFinding)
        {
        if (!iCameraWrapper->IsAutoFocusSupported())
            {
            // No focus supported
            SetTitle(_L("Capturing picture"));
            iCameraWrapper->StopViewFinder();
            TRAPD(err,iCameraWrapper->CaptureL());
            if (err)
                {
                SetError(_L("Camera capture error %d"), err);                    
                }
            }
        else
            {
            // Focusing supported
            iCameraWrapper->StartFocusL();
            SetTitle(_L("Autofocusing..."));                    
            }
        }
    }

void CCameraWrapperExampleAppView::MceoFocusComplete()
    {
    // CameraEngine state is EEngineIdle
    SetTitle(_L("Focused"));                    

    if (iCameraShutterFocusing)
        {
        // Leave as focused. User must press whole camera shutter down for capturing
        // then CCameraWrapperExampleAppView::Capture() is called
        }
    else
        {
        // Capture picture after it has focused
        iCameraWrapper->StopViewFinder();
        TRAPD(err,iCameraWrapper->CaptureL());
        if (err)
            {
            SetError(_L("Camera capture error %d"), err);                    
            }
        }
    }

void CCameraWrapperExampleAppView::MceoCapturedDataReady( TDesC8* aData )
    {
    SetTitle(_L("Saving picture..."));
    
    delete iData; iData = NULL;
    iData = aData->Alloc();

    if (iCameraWrapper)
        iCameraWrapper->ReleaseImageBuffer();

    TRAP_IGNORE(iAppUi->UseOptionsBackCbaL());
    
    StorePicture(iData);
    }

void CCameraWrapperExampleAppView::StorePicture( TDesC8* aData )
    {
    // Create path for filename
    TFileName path = PathInfo::PhoneMemoryRootPath(); 
    path.Append(PathInfo::ImagesPath());

    // Ensure that path exists
    BaflUtils::EnsurePathExistsL(iEikonEnv->FsSession(),path);

    // Get next free filename for the image
    TFileName fileToSave;
    TBool fileExists = ETrue;
    for (TInt i=1 ; i<100 ; i++)
        {
        fileToSave.Copy(path);
        fileToSave.Append(_L("cw_image_"));
        fileToSave.AppendNum(i);
        fileToSave.Append(_L(".jpg"));
        fileExists = BaflUtils::FileExists(iEikonEnv->FsSession(),fileToSave);
        if (!fileExists)
            {
            break;
            }
        }

    // Save file
    if (!fileExists)
        {
        RFile file;
        TInt err = file.Create(iEikonEnv->FsSession(),fileToSave,EFileWrite);
        if (!err)
            {
            file.Write(*aData);
            file.Close();
            SetTitle(fileToSave);
            }
        else
            {
            SetError(_L("File saving error %d"),err);
            }
        }
    else
        {
        SetTitle(_L("File not saved, delete old pictures!"));
        }
    }


void CCameraWrapperExampleAppView::MceoCapturedBitmapReady( CFbsBitmap* aBitmap )
    {
    if (iBackBufferContext)
        {
        TSize bmpSizeInPixels = aBitmap->SizeInPixels();
        TInt xDelta = (Rect().Width() - bmpSizeInPixels.iWidth) / 2;
        TInt yDelta = (Rect().Height() - bmpSizeInPixels.iHeight) / 2;
        TPoint pos( xDelta, yDelta );

        // Copy received viewfinder picture to back buffer
        iBackBufferContext->BitBlt( pos, aBitmap, TRect( TPoint( 0, 0 ), bmpSizeInPixels ));

        // Update backbuffer into screen 
        SetTitle(_L("New picture"));
        }
    if (iCameraWrapper)
        iCameraWrapper->ReleaseImageBuffer();
    }

void CCameraWrapperExampleAppView::MceoViewFinderFrameReady( CFbsBitmap& aFrame )
    {
    if (iBackBufferContext)
        {
        TSize bmpSizeInPixels = aFrame.SizeInPixels();
        TInt xDelta = (Rect().Width() - bmpSizeInPixels.iWidth) / 2;
        TInt yDelta = (Rect().Height() - bmpSizeInPixels.iHeight) / 2;
        TPoint pos( xDelta, yDelta );

        // Copy received viewfinder picture to back buffer
        iBackBufferContext->BitBlt( pos, &aFrame, TRect( TPoint( 0, 0 ), bmpSizeInPixels ));

        // Update backbuffer into screen 
        DrawNow();
        }
    if (iCameraWrapper)
        iCameraWrapper->ReleaseViewFinderBuffer();
    }

void CCameraWrapperExampleAppView::MceoHandleError( TCameraEngineError aErrorType, TInt aError )
    {
    // NOTE: CameraEngine state seems to go into CCameraEngine::EEngineIdle state
    
    if (aErrorType == EErrReserve)
        {
        return; //-18 comes on application startup, but everything works ok
        }

    switch (aErrorType)
        {
        case EErrReserve:
            {
            SetError(_L("Camera reserved error  (%d)"), aError);
            break;
            }
        case EErrPowerOn:
            {
            SetError(_L("Camera power on error  (%d)"), aError);
            break;
            }
        case EErrViewFinderReady:
            {
            SetError(_L("Camera viewfinder error  (%d)"), aError);
            break;
            }
        case EErrImageReady:
            {
            SetError(_L("Camera image ready error  (%d)"), aError);
            break;
            }
        case EErrAutoFocusInit:
        case EErrAutoFocusMode:
        case EErrAutoFocusArea:
        case EErrAutoFocusRange:
        case EErrAutoFocusType:
        case EErrOptimisedFocusComplete:
            {
            SetTitle(_L("Try focusing again"));
            break;
            }
        default:
            {
            SetError(_L("Error %d (%d)"), aErrorType, aError);
            break;
            }
        };
    
    // Try handle error
    CancelCapturedPicture(EFalse);
    iAppUi->UseOptionsExitCbaL();
    }

void CCameraWrapperExampleAppView::MceoHandleOtherEvent( const TECAMEvent& /*aEvent*/ )
    {
    }


// End of File

---

Copyright ©2010 Nokia Corporation and/or its subsidiary(-ies).
All rights reserved. Unless otherwise stated, these materials are provided under the terms of the Eclipse Public License v1.0.