--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/collectionframework/thumbnailcreator/inc/glxtnquickthumbnailtask.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,117 @@
+/*
+* Copyright (c) 2006-2006 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:    Quick thumbnail generation task.
+*
+*/
+
+
+
+
+/**
+ * @internal reviewed 30/07/2007 by Simon Brooks
+ */
+
+#ifndef C_GLXTNQUICKTHUMBNAILTASK_H
+#define C_GLXTNQUICKTHUMBNAILTASK_H
+
+#include "glxtnloadthumbnailtask.h"
+#include "glxthumbnailinfo.h"
+
+// Forward declarations
+class CGlxtnFileUtility;
+class CGlxtnVideoUtility;
+class CFbsBitmap;
+
+/**
+ * Task to quickly produce a thumbnail for an item, usually from the EXIF
+ * thumbnail.
+ *
+ * The task first attempts to extract the EXIF thumbnail data from the file
+ * using ExifLib.  If this succeeds, an instance of CImageDecoder is constructed
+ * from the data and used to produce a bitmap.
+ *
+ * If this fails, an instance of CImageDecoder is constructed from the file,
+ * and set to use the thumbnail.  If this fails, it is assumed that there is no
+ * EXIF thumbnail in the file, and the decoder is set to scale the main image
+ * as close as possible to the required thumbnail size.
+ *
+ * No scaling or image enhancement is applied to the decoded bitmap.
+ *
+ * @author Dan Rhodes
+ * @ingroup glx_thumbnail_creator
+ */
+NONSHARABLE_CLASS( CGlxtnQuickThumbnailTask ) : public CGlxtnLoadThumbnailTask
+    {
+public:
+    /**
+    * Two-phased constructor.
+    * @param aRequestInfo Parameters for the thumbnail request.
+    * @param aFileUtility File utility for use by the task.
+    * @param aClient Client initiating the request.
+    */
+	static CGlxtnQuickThumbnailTask* NewL(
+        const TGlxThumbnailRequest& aRequestInfo,
+        CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient);
+    /**
+    * Destructor.
+    */
+    ~CGlxtnQuickThumbnailTask();
+
+protected:  // From CGlxtnTask
+
+    TBool DoStartL(TRequestStatus& aStatus);
+	void DoCancel();
+	TBool DoRunL(TRequestStatus& aStatus);
+    TBool DoRunError(TInt aError);
+
+private:
+    /**
+    * C++ default constructor.
+    * @param aRequestInfo Parameters for the thumbnail request.
+    * @param aFileUtility File utility for use by the task.
+    * @param aClient Client initiating the request.
+    */
+    CGlxtnQuickThumbnailTask(const TGlxThumbnailRequest& aRequestInfo,
+        CGlxtnFileUtility& aFileUtility, MGlxtnThumbnailCreatorClient& aClient);
+
+    /**
+    * Start asynchronous decoding process for a low quality thumbnail.
+    * @param aStatus Request status for the asynchronous operation.
+    */
+    void QuickDecodeL(TRequestStatus& aStatus);
+    /**
+    * Decode an image file using thumbnail embedded in the file if possible.
+    * @param aStatus Request status for the asynchronous operation.
+    */
+    void ReadThumbnailL(TRequestStatus& aStatus);
+    /**
+    * Read thumbnail data from the file using ExifLib.
+    */
+    void ReadExifThumbnailL();
+    void QuickScaleL();
+
+private:
+    /** Quality of thumbnail (high if loaded, low if generated) */
+    TGlxThumbnailQuality iQuality;
+    /** Utility to get thumbnail from video (owned) */
+    CGlxtnVideoUtility* iUtility;
+    /** Bitmap to hold video frame (owned) */
+    CFbsBitmap* iVideoFrame;
+    /** Whether the media file is a video */
+    TBool iVideo;
+    /** Flag to show BadFileMarker not created so no need to delete **/
+    TBool iBadFileMarkerNotNeededFlag;
+    };
+
+#endif // C_GLXTNQUICKTHUMBNAILTASK_H