phonebookui/Phonebook2/ccapplication/ccapp/ccapputil/inc/ccappimagedecoding.h
branchRCL_3
changeset 3 04ab22b956c2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/phonebookui/Phonebook2/ccapplication/ccapp/ccapputil/inc/ccappimagedecoding.h	Fri Feb 19 22:40:27 2010 +0200
@@ -0,0 +1,183 @@
+/*
+* Copyright (c) 2008-2010 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:  Utility class for asynchronously decoding the header thumbnail image
+*
+*/
+
+
+#ifndef CCAPPIMAGEDECODING_H_
+#define CCAPPIMAGEDECODING_H_
+
+#include <e32base.h>
+
+class CBitmapScaler;
+class CImageDecoder;
+class CFbsBitmap;
+class RFs;
+
+class MCCAppImageDecodingObserver
+	{
+public:
+	/**
+	 * Bitmap is decoded.
+	 * @param aBitmap Decoded bitmap, ownership is transferred.
+	 */ 
+	virtual void BitmapReadyL( CFbsBitmap* aBitmap ) = 0;
+
+protected:
+	MCCAppImageDecodingObserver() {};
+	virtual ~MCCAppImageDecodingObserver() {};
+	};
+
+
+/**
+ * Utility class for asynchronously decoding the header thumbnail image
+ *
+ *  @code
+ *   ?good_class_usage_example(s)
+ *  @endcode
+ *
+ *  @lib ccapputil.dll
+ *  @since S60 v9.2
+ */
+NONSHARABLE_CLASS( CCCAppImageDecoding ) : public CActive
+    {
+public:
+    /**
+     * Two-phased constructor
+     * 
+     * @param aObserver 
+     * @param aBitmapData Descriptor containing the bitmap data stream, takes ownership
+     * @param aImageFile Descriptor containing image file name full path, takes ownership
+     */
+    IMPORT_C static CCCAppImageDecoding* NewL(
+            MCCAppImageDecodingObserver& aObserver,
+            RFs& aFs,
+            HBufC8* aBitmapData, 
+            HBufC* aImageFile );
+    
+    /**
+     * Destructor
+     */
+    ~CCCAppImageDecoding();
+    
+    /**
+     * Starts the decoding process
+     * 
+     * @param aImageSize defines image size
+     */
+    IMPORT_C void StartL( const TSize& aImageSize );
+
+private:
+    /**
+     * From CActive
+     * (see details from baseclass )
+     */
+    void RunL();
+    
+    /**
+     * From CActive
+     * (see details from baseclass )
+     */
+    void DoCancel();
+private:
+    /**
+     * First-phase (C++) constructor
+     */
+    inline CCCAppImageDecoding(
+            MCCAppImageDecodingObserver& aObserver,
+            RFs& aFs,
+            HBufC8* aBitmapData, 
+            HBufC* aImageFile);
+    
+    /**
+     * Second phase constructor
+     */
+    inline void ConstructL();
+    
+    /**
+     * Scales bitmap
+     *
+     */
+    void ScaleBitmapL();
+
+    void CropBitmapL();
+    
+    /**
+     * Create bitmap
+     *
+     */
+    void CreateBitmapL();
+    
+    enum TCcaImageDecoderState
+        {
+        ECcaConvertThumbnailImage = 1,
+        ECcaScaleThumbnail,
+        ECcaReadImageFromFile,
+        ECcaConvertImageFromFile,
+        ECcaScaleImage
+        };
+    
+    /**
+     * The image scaler whose service is called to scale the image
+     * Own.
+     */
+    CBitmapScaler* iBitmapScaler;
+    
+    /**
+     * The image decoder whose service is called to decode the image
+     * Own.
+     */
+    CImageDecoder* iImgDecoder;
+    
+    MCCAppImageDecodingObserver& iObserver;
+    
+    /**
+     * Handle to the file server session for loading the bitmap
+     */ 
+    RFs& iFs;
+    
+    /**
+     * The bitmap.
+     * Owned until decoding is complete, then ownersip is transferred to header control.
+     */
+    CFbsBitmap* iBitmap; // owned until completion
+    
+    /**
+     * Own.
+     */
+    HBufC8* iBitmapData;
+
+    /**
+     * Own.
+     */
+    HBufC* iImageFullName;
+    
+    /** 
+      * Contact bitmap size 
+      */ 
+    TSize iBitmapSize;
+    
+    /** 
+      * Decoder internal state
+      */ 
+    TInt iDecoderState;
+    
+    /** 
+      * Timer used to delay image conversion
+      */ 
+    RTimer iTimer;
+    };
+
+#endif /*CCAPPIMAGEDECODING_H_*/