How To Combine Two Images?

[coolblues5000]

how do you combine two images then save it as one? for example i have an image take from the camera and another image of a frame, and i want to combine those two images.

[Sorcery-ltd]

Combine them how? One on top of another? Assuming the frame has correct transparency information then just draw it on top of the other image.

Sorcery

[lming]

I think that there is no offical API to combine images.maybe you need to write your own plug-in.

[coolblues5000]

Combine them how? One on top of another? Assuming the frame has correct transparency information then just draw it on top of the other image.

Sorcery

yes, i want the frame to be on top of the image taken from the camera. then save the it as one image.

[coolblues5000]

do you want to find out byte difference or content difference?
content difference is pretty hard to check because it equals to image recognition.

no, i just want to put the frame on top of the image taken from the camera then save them as one image.

[Sorcery-ltd]

If the pixels in the centre of the frame have the correct alpha values then you should be able to BitBlt() the frame on top of the picture and it will work. If not you could create a mask for the centre of the frame and use BitBltMasked().

Sorcery

[sriky27]

How about using offscreen bitmap . You could first blit image take from camera and then blit the image frame. You have a combined image. For usage following this link

[coolblues5000]

how can i draw merge the one with transparency on top if there is no gc.bitblit in the bitmapContext?

[coolblues5000]

I'm having an e32user-cbase 71 error when i tried combining the two image....

void CCameraCaptureEngine::ImageReady(CFbsBitmap* aBitmap,HBufC8* /*aData*/,
									  TInt aError)
    {
    TInt err(KErrNone);
    if ( !aError )
        {
        
        iBitmapSave = aBitmap;
        
        CGraphicsContext* bitmapContext=NULL;
        CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(iBitmapSave);
        CleanupStack::PushL(bitmapDevice);
        User::LeaveIfError(bitmapDevice->CreateContext(bitmapContext));
        CleanupStack::PushL(bitmapContext);
        
        bitmapContext->DrawBitmap(TPoint(0,0), iController.iGif_Reader->Bitmap());
        
    	iController.iGif_Reader->ScaleFileImage(TSize(640,480), iBitmapSave);
        TRAP(err, DrawL());
        HandleError( err );
        }
    else
        {
        HandleError( aError );  
        }
    }

[coolblues5000]

i fixed the panic.. but my image is not being merged???

        iBitmapSave = aBitmap;
        
        CGraphicsContext* bitmapContext=NULL;
        CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(iBitmapSave);
        CleanupStack::PushL(bitmapDevice);
        User::LeaveIfError(bitmapDevice->CreateContext(bitmapContext));
        CleanupStack::PushL(bitmapContext);
        
        bitmapContext->DrawBitmap(TPoint(0,0), iController.iGif_Reader->Bitmap());
        
    	iController.iGif_Reader->ScaleFileImage(TSize(640,480), iBitmapSave);
        TRAP(err, DrawL());
        CleanupStack::PopAndDestroy(bitmapContext);
        CleanupStack::PopAndDestroy(bitmapDevice);

[sriky27]

Hi coolblue,

Could you be more specific by two images not being merged. Show your DrawL code

[coolblues5000]

hi sriky

the image is saved is all white

void CCameraCaptureEngine::DrawL()
    {
    
    
    CFbsBitGc* fbsBitGc = CFbsBitGc::NewL(); //graphic context
    CleanupStack::PushL( fbsBitGc );
 
    User::LeaveIfError( iController.GetSnappedImage().
        Resize( iLandscapeSize ));
        

    CFbsBitmapDevice* bmpDevice = 
        CFbsBitmapDevice::NewL( &iController.GetSnappedImage() );	
    fbsBitGc->Activate( bmpDevice );

    
    fbsBitGc->DrawBitmap( TRect(iLandscapeSize), iBitmapSave );
    delete bmpDevice;
    CleanupStack::PopAndDestroy(fbsBitGc);//fbsBitGc;

	// Start to save the image.
//	StartToSaveImage();	
    iController.ShowConversionStatusL( KImageSaveImage );
    }

i didn't place anything in the drawL(), i just tried the link you gave below...

[sriky27]

Hi you should try this

iBitmapSave = aBitmap;
        
        CGraphicsContext* bitmapContext=NULL;
        CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(iBitmapSave);
        CleanupStack::PushL(bitmapDevice);
        User::LeaveIfError(bitmapDevice->CreateContext(bitmapContext));
        CleanupStack::PushL(bitmapContext);
        
        bitmapContext->DrawBitmap(TPoint(0,0), iController.iGif_Reader->Bitmap());
        
    	iController.iGif_Reader->ScaleFileImage(TSize(640,480), iBitmapSave);
        bitmapContext->DrawBitmap( TRect(iLandscapeSize), iBitmapSave );

        CleanupStack::PopAndDestroy(bitmapContext);
        CleanupStack::PopAndDestroy(bitmapDevice

Problem was you were drawing bitmaps on two differnt contexxts.

[coolblues5000]

hi its still not working.. the saved image is scaled but the frame was not painted on top

void CCameraCaptureEngine::DrawL()
    {
    
    
    CFbsBitGc* fbsBitGc = CFbsBitGc::NewL(); //graphic context
    CleanupStack::PushL( fbsBitGc );
 
    User::LeaveIfError( iController.GetSnappedImage().
        Resize( iLandscapeSize ));
        

    CFbsBitmapDevice* bmpDevice = 
        CFbsBitmapDevice::NewL( &iController.GetSnappedImage() );	
    fbsBitGc->Activate( bmpDevice );

    
    fbsBitGc->DrawBitmap( TRect(iLandscapeSize), iBitmapSave );
    delete bmpDevice;
    CleanupStack::PopAndDestroy(fbsBitGc);//fbsBitGc;

    
    CGraphicsContext* bitmapContext=NULL;
    CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(iBitmapSave);
    CleanupStack::PushL(bitmapDevice);
    User::LeaveIfError(bitmapDevice->CreateContext(bitmapContext));
    CleanupStack::PushL(bitmapContext);
      
	iController.iGif_Reader->ScaleFileImage(TSize(640,480), iBitmapSave);
    bitmapContext->DrawBitmap( TRect(iLandscapeSize), iBitmapSave );
    
    bitmapContext->DrawBitmap(TPoint(0,0), iController.iGif_Reader->Bitmap());

    CleanupStack::PopAndDestroy(bitmapContext);
    CleanupStack::PopAndDestroy(bitmapDevice);
    
	// Start to save the image.
//	StartToSaveImage();	
    iController.ShowConversionStatusL( KImageSaveImage );
    }

[coolblues5000]

i tried adding this

// draw something on the bitmap
TRect rect(0,0,100,100);
bitmapContext->SetBrushColor(KRgbRed);
bitmapContext->SetBrushStyle(CGraphicsContext::ESolidBrush);
bitmapContext->DrawRect(rect); // a filled red rectangle

its paints a red box...

is it because the bitmap I'm painting has a problem?

CFbsBitmap* CGif_Reader::Bitmap()
    {
    
    CFbsBitmap* bitmap = NULL;
    if ( iArray.Count() && iArray[ iCurrImg ].iBitmap )
        {
        bitmap = new ( ELeave ) CFbsBitmap;
        bitmap->Duplicate ( iArray[ iCurrImg ].iBitmap->Handle() );
        return bitmap;
        }
    
    return bitmap;
    
    }