mmserv/thumbnailengine/ImaamiSrc/DCDithering.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:08:46 +0200
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/*
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* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  
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*	CDCDithering 
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*		Dithering by H263 algorithm developed in NMP/Oulu.
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*
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*/
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//  Include Files  
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#include <e32std.h>   // The basic definitions
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#include <fbs.h>      // For FBS bitmap
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#include "DCDithering.h"     // The DCDithering class
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//  MEMBER FUNCTIONS
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//=============================================================================
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/*
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-----------------------------------------------------------------------------
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    CDCDithering
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    Constructor
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    Default constructor
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    Return Values:  none
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-----------------------------------------------------------------------------
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*/
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CDCDithering::CDCDithering()
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{
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	// This function is intentionally left blank.
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}
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/*
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-----------------------------------------------------------------------------
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    CDCDithering
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    NewLC
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    Factory function to instantiate the class.
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    This function leaves the class pointer to the cleanup stack
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    May leave with KErrNoMemory if no memory available
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    Return Values:  CDCDithering* self:  pointer to the class instance
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-----------------------------------------------------------------------------
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*/
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CDCDithering* CDCDithering::NewLC()
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{
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    CDCDithering* self = new (ELeave) CDCDithering();
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    CleanupStack::PushL(self);
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    self->ConstructL();
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    return self;
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}
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/*
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-----------------------------------------------------------------------------
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    CDCDithering
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    NewL
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    Factory function to instantiate the class.
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    May leave with KErrNoMemory if no memory available
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    Return Values:  CDCDithering* self:  pointer to the class instance
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-----------------------------------------------------------------------------
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*/
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CDCDithering* CDCDithering::NewL()
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{
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    CDCDithering* self = CDCDithering::NewLC();
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    CleanupStack::Pop();
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    return self;
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}
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/*
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-----------------------------------------------------------------------------
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    CDCDithering
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    ConstructL
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    Second phase constructor. Does nothing at the moment
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    Return Values:  none
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-----------------------------------------------------------------------------
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*/
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void CDCDithering::ConstructL()
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{
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    // This function is intentionally left blank.
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}
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   121
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   122
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   123
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   124
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/*
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-----------------------------------------------------------------------------
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    CDCDithering
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   129
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    Destructor
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    Return Values:  none
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-----------------------------------------------------------------------------
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*/
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CDCDithering::~CDCDithering()
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{
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	// This function is intentionally left blank.
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}
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   141
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   142
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/*
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-----------------------------------------------------------------------------
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  ProcessL
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  Process image referenced by aImage (modify aImage).
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  May leave with KErrNoMemory if no memory available
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   150
	  
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  Return Values:  none
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-----------------------------------------------------------------------------
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*/
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void CDCDithering::ProcessL(CFbsBitmap& aImage)
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{
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	TUint	r, g, b;	// Color components
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	TUint8*	dataPtr;	// Pointer to data
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   159
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	//Dithering variables, init to 0
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	TInt	count=0;	
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	TInt16	dither=0;
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   163
	
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	//EColor16M image is needed
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	if (aImage.DisplayMode() != EColor16M || aImage.DisplayMode() != EColor16M)
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		return;
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   167
	
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	// Line Buffer and pointer to the data
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	TUint imageWidth = aImage.SizeInPixels().iWidth;
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	TUint scanLineLengthInBytes = aImage.ScanLineLength(imageWidth, aImage.DisplayMode());
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   171
	
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	//Allocate buffer for scanline
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	iScanLineBuffer = HBufC8::NewMaxL(scanLineLengthInBytes);
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	//Pointer to scanline
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	TPtr8 linePtr = iScanLineBuffer->Des();
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   176
	
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	//Step through image lines
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	for (TInt lineNo=0; lineNo<aImage.SizeInPixels().iHeight; ++lineNo)
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   179
	{
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		//Get line
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   181
		aImage.GetScanLine(linePtr, TPoint(0, lineNo), imageWidth, aImage.DisplayMode());
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   182
		//CHECK! CONST_CAST not used in every algorithm which way is better?
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   183
		dataPtr = CONST_CAST(TUint8*, linePtr.Ptr());
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   184
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   185
		//Step through image pixels
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   186
		for (TUint x=0; x < imageWidth; ++x)
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   187
		{
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   188
			// Get original values
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   189
			b = *dataPtr++;
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   190
			g = *dataPtr++;
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   191
			r = *dataPtr++;
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   192
			
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   193
			//Compute DCDithering factor from base count
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   194
			switch (count&1)
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   195
			{
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   196
			case 0:
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   197
				dither = (TInt16)(dither*0x7ffd);
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   198
				break;
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   199
			case 1:
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   200
				dither = (TInt16)(dither+0x7f21);
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   201
				break;
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   202
			}
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   203
			
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   204
			//Add DCDithering factor, adjust gain according to quantization factors.
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   205
			r = Limit255((TInt)r + (dither>>13));
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   206
			g = Limit255((TInt)g - (dither>>14));
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   207
			b = Limit255((TInt)b + (dither>>13));
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   208
			
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   209
			//Move to the previous pixel
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   210
			dataPtr -= 3;
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parents:
diff changeset
   211
			
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   212
			/* Set the result */
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   213
			*dataPtr++ = (TUint8)b;
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   214
			*dataPtr++ = (TUint8)g;
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   215
			*dataPtr++ = (TUint8)r;
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parents:
diff changeset
   216
		
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   217
			//Increase bae count
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   218
			count++;
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   219
		}
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   220
		
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   221
		//Set scan line
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   222
		aImage.SetScanLine(linePtr, lineNo);
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   223
	}
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   224
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   225
	//Free allocated memory
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   226
	delete(iScanLineBuffer);
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   227
	iScanLineBuffer = 0;
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   228
}
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   229
//  End of File  
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diff changeset
   230
//----IMAAMI----