diff -r 000000000000 -r 4e91876724a2 photosgallery/collectionframework/thumbnailcreator/src/glxtnquickthumbnailtask.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/collectionframework/thumbnailcreator/src/glxtnquickthumbnailtask.cpp	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,353 @@
+/*
+* Copyright (c) 2008-2009 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:    Classes for thumbnail-related tasks.
+*
+*/
+
+
+
+
+/**
+ * @internal reviewed 31/07/2007 by Simon Brooks
+ */
+
+#include "glxtnquickthumbnailtask.h"
+
+#include <ExifRead.h>
+#include <glxassert.h>
+#include <glxtracer.h>
+#include <imageconversion.h>
+
+#include "glxtnfileinfo.h"
+#include "glxtnfileutility.h"
+#include "glxtnimagedecoderfactory.h"
+#include "glxtnthumbnailrequest.h"
+#include "glxtnvideoutility.h"
+#include "mglxtnthumbnailcreatorclient.h"
+
+
+// All EXIF data is within the first KGlxMaxExifSize bytes of the file
+const TInt KGlxMaxExifSize = 0x10000;
+
+// -----------------------------------------------------------------------------
+// NewL
+// -----------------------------------------------------------------------------
+//
+CGlxtnQuickThumbnailTask* CGlxtnQuickThumbnailTask::NewL(
+        const TGlxThumbnailRequest& aRequestInfo,
+        CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient)
+    {
+    TRACER("CGlxtnQuickThumbnailTask::NewL()");
+    CGlxtnQuickThumbnailTask* task = new (ELeave) CGlxtnQuickThumbnailTask(
+                                        aRequestInfo, aFileUtility, aClient);
+    CleanupStack::PushL(task);
+    task->ConstructL(aRequestInfo.iBitmapHandle);
+    CleanupStack::Pop( task );
+    return task;
+    }
+
+// -----------------------------------------------------------------------------
+// Constructor
+// -----------------------------------------------------------------------------
+//
+CGlxtnQuickThumbnailTask::CGlxtnQuickThumbnailTask(
+                                    const TGlxThumbnailRequest& aRequestInfo,
+                                    CGlxtnFileUtility& aFileUtility,
+                                    MGlxtnThumbnailCreatorClient& aClient ) :
+    CGlxtnLoadThumbnailTask( KGlxtnTaskIdQuickThumbnail,
+                            aRequestInfo, aFileUtility, aClient ),
+    iQuality( EGlxThumbnailQualityLow )
+    {
+    TRACER("CGlxtnQuickThumbnailTask::CGlxtnQuickThumbnailTask()");
+    }
+
+// -----------------------------------------------------------------------------
+// Destructor
+// -----------------------------------------------------------------------------
+//
+CGlxtnQuickThumbnailTask::~CGlxtnQuickThumbnailTask() 
+    {
+    TRACER("CGlxtnQuickThumbnailTask::~CGlxtnQuickThumbnailTask()");
+    delete iUtility;
+    delete iVideoFrame;
+    }
+
+// -----------------------------------------------------------------------------
+// DoStartL
+// -----------------------------------------------------------------------------
+//
+TBool CGlxtnQuickThumbnailTask::DoStartL(TRequestStatus& aStatus)
+    {
+    TRACER("TBool CGlxtnQuickThumbnailTask::DoStartL()");
+    iInfo = new (ELeave) CGlxtnFileInfo;
+	Client().FetchFileInfoL(iInfo, ItemId(), &aStatus);
+    iState = EStateFetchingUri;
+
+    return ETrue;
+    } 
+
+// -----------------------------------------------------------------------------
+// DoCancel
+// -----------------------------------------------------------------------------
+//
+void CGlxtnQuickThumbnailTask::DoCancel() 
+    {
+    TRACER("void CGlxtnQuickThumbnailTask::DoCancel()");
+    CGlxtnLoadThumbnailTask::DoCancel();
+
+    if ( EStateFetchingUri == iState )
+        {
+        Client().CancelFetchUri( ItemId() );
+        }
+
+    if ( iUtility )
+        {
+        iUtility->Cancel();
+        }
+
+    iFileUtility.ClearBadFileMarker();
+    }
+
+// -----------------------------------------------------------------------------
+// DoRunL
+// -----------------------------------------------------------------------------
+//
+TBool CGlxtnQuickThumbnailTask::DoRunL(TRequestStatus& aStatus) 
+    {
+    TRACER("TBool CGlxtnQuickThumbnailTask::DoRunL()");
+    TInt error = aStatus.Int();
+	TBool active = EFalse;
+
+    if ( KErrNone == error )
+        {
+        switch ( iState )
+            {
+            case EStateFetchingUri:
+                User::LeaveIfNull(iInfo);
+                iBadFileMarkerNotNeededFlag = ETrue;
+
+                TBool protectedFile;
+                iInfo->IdentifyFileL(iVideo, protectedFile);
+                
+                // leave if file is DRM protected and client has no DRM 
+                // capablity
+                if ( protectedFile && !iDrmAllowed )
+                    {
+                    User::Leave(KErrAccessDenied);
+                    }
+
+                if ( !LoadThumbnailL( aStatus ) )
+                    {
+                    iBadFileMarkerNotNeededFlag = EFalse;
+                    iFileUtility.CheckBadFileListL( iInfo->FilePath() );
+                    QuickDecodeL(aStatus);
+                    }
+                active = ETrue;
+                break;
+
+            case EStateLoading:
+                iQuality = EGlxThumbnailQualityHigh;
+                active = HandleLoadedThumbnailL(aStatus);
+                break;
+
+            case EStateDecodingThumbnail:
+                // Nothing to do
+                break;
+
+            case EStateDecodingImage:
+                QuickScaleL();
+                break;
+
+            default:
+                GLX_ASSERT_ALWAYS( EFalse, Panic( EGlxPanicIllegalState ),
+                                "CGlxtnQuickThumbnailTask: Illegal state" );
+                break;
+            }
+        }
+    else
+        {
+        if ( EStateLoading == iState )
+            {
+            // Loading failed - generate low quality thumbnail instead
+            iBadFileMarkerNotNeededFlag = EFalse;
+            iFileUtility.CheckBadFileListL( iInfo->FilePath() );
+            QuickDecodeL(aStatus);
+            active = ETrue;
+            }
+        }
+
+    if ( !active )
+        {
+        if ( !iBadFileMarkerNotNeededFlag )
+            {
+            iFileUtility.ClearBadFileMarker();
+            }
+        Client().ThumbnailFetchComplete(ItemId(), iQuality, error);
+        }
+       
+    return active; 
+    }
+
+// -----------------------------------------------------------------------------
+// DoRunError
+// -----------------------------------------------------------------------------
+//
+TBool CGlxtnQuickThumbnailTask::DoRunError(TInt aError)
+    {
+    TRACER("TBool CGlxtnQuickThumbnailTask::DoRunError(TInt aError)");
+    iFileUtility.ClearBadFileMarker();
+    Client().ThumbnailFetchComplete(ItemId(), iQuality, aError);
+
+    return EFalse;
+    }
+
+// -----------------------------------------------------------------------------
+// QuickDecodeL
+// -----------------------------------------------------------------------------
+//
+void CGlxtnQuickThumbnailTask::QuickDecodeL(TRequestStatus& aStatus)
+    {
+    TRACER("void CGlxtnQuickThumbnailTask::QuickDecodeL(TRequestStatus& aStatus)");
+    iQuality = EGlxThumbnailQualityLow;
+
+    if ( iVideo )
+        {
+        RArray<TSize> targetSizes;
+        CleanupClosePushL(targetSizes);
+        targetSizes.AppendL( TSize(iRequestedSize) );
+        iUtility = new (ELeave) CGlxtnVideoUtility;
+        iUtility->GetVideoFrameL(&aStatus, iVideoFrame, iInfo->FilePath(), targetSizes, iThumbnail->DisplayMode() );
+        iState = EStateDecodingImage;
+        CleanupStack::PopAndDestroy(&targetSizes);
+        }
+    else
+        {
+        ReadThumbnailL(aStatus);
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// ReadThumbnailL
+// -----------------------------------------------------------------------------
+//
+void CGlxtnQuickThumbnailTask::ReadThumbnailL(TRequestStatus& aStatus)
+    {
+    TRACER("void CGlxtnQuickThumbnailTask::ReadThumbnailL(TRequestStatus& aStatus)");
+    TBool scaleBitmap = ETrue;
+
+    TRAPD(error, ReadExifThumbnailL());
+    if ( KErrNotFound == error || KErrCorrupt == error
+        || KErrNotSupported == error )
+        {
+        GLX_DEBUG2("CGlxtnQuickThumbnailTask::ReadThumbnailL() EXIF error(%d)", error);    
+        // Use CImageDecoder to get the EXIF thumbnail instead
+        iDecoder = GlxtnImageDecoderFactory::NewL(
+                                iFileUtility.FsSession(), iInfo->FilePath() );
+
+        TRAPD( error2, iDecoder->SetImageTypeL(
+                                    CImageDecoder::EImageTypeThumbnail ) );
+        if ( KErrNotFound == error2 )
+            {
+            // No EXIF thumbnail - load whole image and scale quickly
+            scaleBitmap = ETrue;
+            }
+        else
+            {
+            User::LeaveIfError( error2 );
+            }
+        }
+    else
+        {
+        User::LeaveIfError(error);
+        GLX_DEBUG1("CGlxtnQuickThumbnailTask::ReadThumbnailL() EXIF TN Found");    
+        iDecoder = GlxtnImageDecoderFactory::NewL(
+                                    iFileUtility.FsSession(), *iThumbData );
+        }
+
+    DecodeThumbnailL(aStatus, scaleBitmap);
+    }
+
+// -----------------------------------------------------------------------------
+// ReadExifThumbnailL
+// -----------------------------------------------------------------------------
+//
+void CGlxtnQuickThumbnailTask::ReadExifThumbnailL()
+    {
+    TRACER("void CGlxtnQuickThumbnailTask::ReadExifThumbnailL()");
+    __ASSERT_ALWAYS(iInfo, Panic(EGlxPanicNullPointer));
+
+    RFile file;
+    CleanupClosePushL(file);
+    User::LeaveIfError(file.Open(iFileUtility.FsSession(),
+                                    iInfo->FilePath(), EFileRead));
+    TInt size;
+    User::LeaveIfError(file.Size(size));
+    if ( KGlxMaxExifSize < size )
+        {
+        size = KGlxMaxExifSize;
+        }
+
+    HBufC8* exifData = HBufC8::NewLC(size);
+    TPtr8 ptr(exifData->Des());
+    User::LeaveIfError(file.Read(ptr));
+
+    CExifRead* exifReader = CExifRead::NewL(*exifData, CExifRead::ENoJpeg);
+    CleanupStack::PushL(exifReader);
+    delete iThumbData;
+    iThumbData = NULL;
+    iThumbData = exifReader->GetThumbnailL();
+
+    CleanupStack::PopAndDestroy(exifReader);
+    CleanupStack::PopAndDestroy(exifData);
+    CleanupStack::PopAndDestroy(&file);
+    }
+
+// -----------------------------------------------------------------------------
+// QuickScaleL
+// -----------------------------------------------------------------------------
+//
+void CGlxtnQuickThumbnailTask::QuickScaleL()
+    {
+    TRACER("void CGlxtnQuickThumbnailTask::QuickScaleL()");
+    User::LeaveIfNull(iVideoFrame);
+
+    TSize frameSize(iVideoFrame->SizeInPixels());
+    TSize thumbSize(iRequestedSize);
+
+    // Reduce target thumbSize to same aspect ratio as source image
+    if ( thumbSize.iHeight * frameSize.iWidth < thumbSize.iWidth * frameSize.iHeight )
+        {
+        // Source has taller aspect than target so reduce target width
+        thumbSize.iWidth = (thumbSize.iHeight * frameSize.iWidth) / frameSize.iHeight;
+        }
+    else
+        {
+        // Source has wider aspect than target so reduce target height
+        thumbSize.iHeight = (thumbSize.iWidth * frameSize.iHeight) / frameSize.iWidth;
+        }
+
+    // Resize empty bitmap to required size
+    User::LeaveIfError( iThumbnail->Resize( thumbSize ) );
+
+    CFbsBitmapDevice* device = CFbsBitmapDevice::NewL( iThumbnail );
+    CleanupStack::PushL(device);
+    CFbsBitGc* context = NULL;
+    User::LeaveIfError(device->CreateContext(context));
+    CleanupStack::PushL(context);
+
+    context->DrawBitmap(TRect(thumbSize), iVideoFrame);
+
+    CleanupStack::PopAndDestroy(context); 
+    CleanupStack::PopAndDestroy(device);
+    }