imagehandlingutilities/thumbnailmanager/plugins/audio/src/thumbnailimagedecoderv3.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/imagehandlingutilities/thumbnailmanager/plugins/audio/src/thumbnailimagedecoderv3.cpp Tue Jan 26 15:18:05 2010 +0200
@@ -0,0 +1,249 @@
+/*
+* Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: Image thumbnail decoder
+ *
+*/
+
+
+//INCLUDE FILES
+#include <e32base.h>
+#include <imageconversion.h>
+#include <exifread.h>
+
+#include <iclextjpegapi.h>
+#include "thumbnailimagedecoderv3.h"
+#include "thumbnaillog.h"
+#include "thumbnailpanic.h"
+
+
+// CImageDecoder supports up to 1/8 size reduction if EFullyScaleable is
+// not set.
+const TInt KMaximumReductionFactor = 8;
+
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// ---------------------------------------------------------------------------
+// CThumbnailImageDecoder::CThumbnailImageDecoder()
+// C++ default constructor can NOT contain any code, that might leave.
+// ---------------------------------------------------------------------------
+//
+CThumbnailImageDecoderv3::CThumbnailImageDecoderv3( RFs& aFs ): CActive(
+ EPriorityStandard ), iFs( aFs )
+ {
+ CActiveScheduler::Add( this );
+ }
+
+
+// ---------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::~CThumbnailImageDecoderv3()
+// Destructor.
+// ---------------------------------------------------------------------------
+//
+CThumbnailImageDecoderv3::~CThumbnailImageDecoderv3()
+ {
+ Release();
+ }
+
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::CreateL()
+// Creates thumbnail of image
+// -----------------------------------------------------------------------------
+//
+void CThumbnailImageDecoderv3::CreateL( const TDesC8* aBuffer, MThumbnailProviderObserver&
+ aObserver, const CThumbnailManager::TThumbnailFlags /*aFlags*/, const
+ TDataType& aMimeType, const TSize& aSize )
+ {
+
+ TN_DEBUG1( "CCThumbnailImageDecoderv3::CreateL() called" );
+
+ iSize = aSize;
+ iMimeType = aMimeType;
+ iObserver = &aObserver;
+ iBuffer = aBuffer;
+
+ CreateDecoderL();
+
+ const TFrameInfo info( iDecoder->FrameInfo());
+ if (( info.iOverallSizeInPixels.iWidth < 1 ) || (
+ info.iOverallSizeInPixels.iHeight < 1 ))
+ {
+ User::Leave( KErrCorrupt );
+ }
+ iFrameInfoFlags = info.iFlags;
+ iOriginalSize = info.iOverallSizeInPixels;
+ }
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::DecodeL()
+// Decode the thumbnail image
+// -----------------------------------------------------------------------------
+//
+void CThumbnailImageDecoderv3::DecodeL( const TDisplayMode aDisplayMode )
+ {
+ // Create the bitmap
+ if ( !iBitmap )
+ {
+ iBitmap = new( ELeave )CFbsBitmap();
+ }
+
+ //Size in both x and y dimension must be non-zero, positive value
+ TSize loadSize( iOriginalSize) ;
+
+ // If EFullyScaleable flag is not set, we need to figure out a size
+ // reduction factor. 1/1, 1/2, 1/4, and 1/8 are possible values for all
+ // plug-ins. SVG graphics can be rendered at any size even though
+ // EFullyScaleable is not set.
+ if ( !( iFrameInfoFlags& TFrameInfo::EFullyScaleable ) )
+ {
+ loadSize = iOriginalSize;
+ TInt reductionFactor = 1;
+ while ( reductionFactor < KMaximumReductionFactor && ( iSize.iWidth <
+ loadSize.iWidth / 2 ) && ( iSize.iHeight < loadSize.iHeight / 2 ))
+ {
+ // magic: use loadSize that is half of previous size
+ loadSize.iWidth /= 2;
+ loadSize.iHeight /= 2;
+ reductionFactor *= 2;
+ }
+ // If original size is not an exact multiple of reduction factor,
+ // we need to round loadSize up
+ if ( reductionFactor && iOriginalSize.iWidth % reductionFactor )
+ {
+ loadSize.iWidth++;
+ }
+ if ( reductionFactor && iOriginalSize.iHeight % reductionFactor )
+ {
+ loadSize.iHeight++;
+ }
+ TN_DEBUG4(
+ "EFullyScaleable not set for image - loadSize=(%d,%d) reduction=1/%d ", loadSize.iWidth, loadSize.iHeight, reductionFactor );
+ }
+
+ User::LeaveIfError( iBitmap->Create( loadSize, aDisplayMode ));
+
+ iDecoder->Convert( &iStatus, * iBitmap );
+ while ( iStatus == KErrUnderflow )
+ {
+ iDecoder->ContinueConvert( &iStatus );
+ }
+ SetActive();
+ }
+
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::Release()
+// Releases resources
+// -----------------------------------------------------------------------------
+//
+void CThumbnailImageDecoderv3::Release()
+ {
+ Cancel();
+ delete iDecoder;
+ iDecoder = NULL;
+ }
+
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::DoCancel()
+// -----------------------------------------------------------------------------
+//
+void CThumbnailImageDecoderv3::DoCancel()
+ {
+ if ( iDecoder )
+ {
+ iDecoder->Cancel();
+ delete iDecoder;
+ iDecoder = NULL;
+ }
+ }
+
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::RunL()
+// -----------------------------------------------------------------------------
+//
+void CThumbnailImageDecoderv3::RunL()
+ {
+ // This call takes ownership of iBitmap
+ iObserver->ThumbnailProviderReady( iStatus.Int(), iBitmap, iOriginalSize, EFalse, EFalse );
+
+ iBitmap = NULL; // owned by server now
+ delete iBuffer;
+ iBuffer = NULL;
+ Release();
+ }
+
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::CreateDecoderL
+// Creates image decoder
+// -----------------------------------------------------------------------------
+//
+void CThumbnailImageDecoderv3::CreateDecoderL()
+ {
+ delete iDecoder;
+ iDecoder = NULL;
+
+ CImageDecoder::TOptions options = ( CImageDecoder::TOptions )(
+ CImageDecoder::EOptionNoDither | CImageDecoder::EPreferFastDecode );
+
+ TRAPD( decErr, iDecoder = CExtJpegDecoder::DataNewL(
+ CExtJpegDecoder::EHwImplementation, iFs, *iBuffer, options ));
+
+ if ( decErr != KErrNone )
+ {
+ TRAP( decErr, iDecoder = CExtJpegDecoder::DataNewL(
+ CExtJpegDecoder::ESwImplementation, iFs, *iBuffer, options ));
+
+ if ( decErr != KErrNone )
+ {
+ // don't force any mime type
+ TRAPD( decErr, iDecoder = CImageDecoder::DataNewL( iFs, *iBuffer, options ) );
+ if ( decErr != KErrNone )
+ {
+ delete iBuffer;
+ iBuffer = NULL;
+
+ TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - error" );
+
+ User::Leave( decErr );
+ }
+
+ TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - CImageDecoder created" );
+ }
+ else
+ {
+ TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - SW CExtJpegDecoder created" );
+ }
+ }
+ else
+ {
+ TN_DEBUG1( "CThumbnailImageDecoderv3::CreateDecoderL() - HW CExtJpegDecoder created" );
+ }
+ }
+
+
+// -----------------------------------------------------------------------------
+// CThumbnailImageDecoderv3::CreateExifDecoderL()
+// Returns size of original image
+// -----------------------------------------------------------------------------
+//
+const TSize& CThumbnailImageDecoderv3::OriginalSize()const
+ {
+ return iOriginalSize;
+ }
+
+//End of file