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/*
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* Copyright (c) 2002 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: Implementation of class CYuv2Rgb24.
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* YUV to EColor16M colorspace converter concrete classes
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*
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*/
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// EXTERNAL RESOURCES
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// Include Files
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#include <e32math.h>
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#include "yuv2rgb24.h"
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#include "brightnesscontrast.h"
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// MEMBER FUNCTIONS
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//=============================================================================
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/*
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-----------------------------------------------------------------------------
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CYuv2Rgb24
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CYuv2Rgb24()
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Standard C++ constructor
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-----------------------------------------------------------------------------
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*/
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CYuv2Rgb24::CYuv2Rgb24()
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{
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iRgbLookupTable = 0;
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iGamma = 65536;
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iBrightnessContrast = KMedBrightnessContrastIndex;
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}
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/*
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-----------------------------------------------------------------------------
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CYuv2Rgb24
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~CYuv2Rgb24()
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Standard C++ destructor
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-----------------------------------------------------------------------------
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*/
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CYuv2Rgb24::~CYuv2Rgb24()
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{
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User::Free(iRgbLookupTable);
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}
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/*
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-----------------------------------------------------------------------------
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CYuv2Rgb24
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ConstructL()
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Standard Symbian OS second-phase constructor. Initializes the object.
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-----------------------------------------------------------------------------
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*/
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void CYuv2Rgb24::ConstructL(TUint aWidth, TUint aHeight, TUint aMaxWidth, TUint aMaxHeight)
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{
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// Remember the dimensions
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// __ASSERT_ALWAYS(((aWidth & 1) == 0) && ((aHeight & 1) == 0),
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// User::Leave(KErrArgument));
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iWidth = aWidth;
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iHeight = aHeight;
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if ( iWidth > aMaxWidth ) {
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iCropWidth = (iWidth-aMaxWidth)/2;
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iWidth = aMaxWidth;
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}
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else {
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iCropWidth = 0;
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}
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if ( iHeight > aMaxHeight ) {
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iCropHeight = (iHeight-aMaxHeight)/2;
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iHeight = aMaxHeight;
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}
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else {
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iCropHeight = 0;
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}
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// Allocate the RGB saturate/gamma lookup table
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iRgbLookupTable = (TUint8*) User::AllocL(ESaturateLength);
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// Initialize brightness & contrast value, this will calculate the conversion table
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// Since this uses the median index, it makes no difference if the preferred
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// enhancement is this or gamma. Furthermore, changes to the value will be done using
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// the appropriate method.
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SetBrightnessContrast(KMaxBCInputIndex/2);
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}
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/*
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-----------------------------------------------------------------------------
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CYuv2Rgb24
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SetGamma()
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Sets the conversion gamma value and recalculates the look-up table
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-----------------------------------------------------------------------------
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*/
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void CYuv2Rgb24::SetGamma(TInt aGamma)
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{
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TInt i, v;
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TReal vNorm;
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// Remember gamma and convert it to floating point
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iGamma = aGamma;
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TReal fGamma = TReal(iGamma) / TReal(65536);
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// Calculate table entries for all possible RGB values:
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for ( i = 0; i < ESaturateLength; i++ )
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{
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// Actual RGB value for this table index
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v = i - ESaturateOffset;
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// Saturate if <0 or >255, otherwise calculate gamma
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if ( v < 0 )
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v = 0;
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else if ( v > 255 )
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v = 255;
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else
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{
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// Normalize v:
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vNorm = TReal(v) / TReal(255);
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// Gamma-correct: v = v ^ gamma
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Math::Pow(vNorm, vNorm, fGamma);
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// Scale back to [0..255] and clamp:
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vNorm = (TReal(255) * vNorm) + 0.5;
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v = (TInt) vNorm;
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if ( v < 0 ) v = 0;
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if ( v > 255 ) v = 255;
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}
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// 24bpp RGB has range [0..255] for all components, store to table:
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iRgbLookupTable[i] = (TUint8) v;
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}
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}
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/*
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-----------------------------------------------------------------------------
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CYuv2Rgb24
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SetBrightnessContrast()
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Sets the index to the predefined brightness&contrast lookup table
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(KBrightnessContrastEnhParam) and recalculates the RGB look-up table
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The algorithm was developed by IMAAMI for Kenny display.
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-----------------------------------------------------------------------------
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*/
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void CYuv2Rgb24::SetBrightnessContrast(TInt aBCIndex)
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{
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TInt i, v;
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TReal vNorm;
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// Convert & remember brightness-contrast index. aBCIndex == 0 to KMaxBCInputIndex.
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iBrightnessContrast = (aBCIndex*KMaxBrightnessContrastIndex)/KMaxBCInputIndex;
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// Calculate table entries for all possible RGB values:
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for ( i = 0; i < ESaturateLength; i++ )
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{
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// Actual RGB value for this table index
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v = 298 * (i - ESaturateOffset - 16) / 256;
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// (see Convert())
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// Saturate if <0 or >255, otherwise calculate value
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if ( v < 0 )
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v = 0;
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else if ( v > 255 )
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v = 255;
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else
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{
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// Normalize v:
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vNorm = TReal(v) / TReal(255);
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vNorm = KBrightnessContrastEnhParam[iBrightnessContrast].a * vNorm + KBrightnessContrastEnhParam[iBrightnessContrast].b;
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if ( vNorm < 0 )
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vNorm = 0;
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else if ( vNorm > 1 )
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vNorm = 1;
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Math::Pow( vNorm, vNorm, KBrightnessContrastEnhParam[iBrightnessContrast].g );
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// Scale back to [0..255] and clamp:
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vNorm = (TReal(255) * vNorm) + 0.5;
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v = (TInt) vNorm;
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if ( v < 0 ) v = 0;
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if ( v > 255 ) v = 255;
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}
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// 24bpp RGB has range [0..255] for all components, store to table:
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iRgbLookupTable[i] = (TUint8) v;
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}
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}
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/*
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-----------------------------------------------------------------------------
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CYuv2Rgb24
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Convert()
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Converts a YUV frame to a EColor16M frame
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-----------------------------------------------------------------------------
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*/
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void CYuv2Rgb24::Convert(const TUint8 *aYBuf, const TUint8 *aUBuf,
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const TUint8 *aVBuf,
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TUint aBufWidth, TUint aBufHeight,
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TUint8 *aTarget, TUint aTargetScanlineLength)
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{
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TUint cols;
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TUint rows = iHeight;
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TUint8 *target;
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TUint8 *target2;
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const TUint8 *yb, *yb2;
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TInt rc, gc, bc;
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TInt y;
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TInt uval, vval;
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TUint8 val;
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__ASSERT_ALWAYS((aBufWidth >= iWidth) && (aBufHeight >= iHeight),
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User::Invariant());
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// Cropping needed?
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if ( iCropWidth > 0 ) {
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//sets offset to buffers; from now on increments below will always result the same offset, since the increment is aBufWidth
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aYBuf += iCropWidth;
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aUBuf += iCropWidth/2;
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aVBuf += iCropWidth/2;
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}
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if ( iCropHeight > 0 ) {
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//skip lines on top
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aYBuf += iCropHeight*aBufWidth;
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aUBuf += (iCropHeight/2)*aBufWidth/2;
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aVBuf += (iCropHeight/2)*aBufWidth/2;
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}
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// We don't interpolate the chrominance values at all, since that way we
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// can save a lot of multiplications. This actually doesn't affect the
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// subjective picture quality much, if at all, with natural images.
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// Conversion is done 2x2 pixels at a time
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// Luminance-only conversion?
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if ( (aUBuf != NULL) && (aVBuf != NULL) )
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{
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// Full conversion
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// Convert all rows, two at a time
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while ( rows )
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{
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// Convert all pixels in this row, two at a time
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cols = iWidth;
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target = aTarget;
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target2 = aTarget + aTargetScanlineLength;
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yb = aYBuf;
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yb2 = aYBuf + aBufWidth;
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while ( cols )
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{
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// Charles Poynton: Color FAQ
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// (http://www.inforamp.net/~poynton/ColorFAQ.html)
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// 30. How do I encode Y'CBCR components from computer R'G'B' ?
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// [normalized]
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// R = 1.1643828125 * (Y-16) + 1.59602734375 * (Cr-128)
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// G = 1.1643828125 * (Y-16) + -0.39178515625 * (Cb-128) + -0.81296875 * (Cr-128)
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// B = 1.1643828125 * (Y-16) + 2.01723046875 * (Cb-128)
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// We'll use fixed-point with 16 bits of fractional part for
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// accuracy. Besides, 24bpp RGB is not likely to be used in
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// low-CPU devices in the near future...
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// Red chrominance part for this 2x2 block:
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vval = ((TInt) aVBuf[0]) - 128;
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rc = 104597 * vval;
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// Green chrominance:
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uval = ((TInt) aUBuf[0]) - 128;
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gc = -25676*uval - 53279*vval;
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// Blue chrominance:
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bc = 132201 * uval;
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// Upper left pixel y part for all components:
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y = 76309 * (((TInt) yb[0]) - 16) + 32768; // round up
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// Calculate components and store:
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// Bitmap format: bbbbbbbb gggggggg rrrrrrrr
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target[0] = iRgbLookupTable[((y+bc) >> 16) + ESaturateOffset];
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target[1] = iRgbLookupTable[((y+gc) >> 16) + ESaturateOffset];
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target[2] = iRgbLookupTable[((y+rc) >> 16) + ESaturateOffset];
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// Upper right pixel:
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y = 76309 * (((TInt) yb[1]) - 16) + 32768;
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target[3] = iRgbLookupTable[((y+bc) >> 16) + ESaturateOffset];
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target[4] = iRgbLookupTable[((y+gc) >> 16) + ESaturateOffset];
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target[5] = iRgbLookupTable[((y+rc) >> 16) + ESaturateOffset];
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// Lower left:
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y = 76309 * (((TInt) yb2[0]) - 16) + 32768;
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target2[0] = iRgbLookupTable[((y+bc) >> 16) + ESaturateOffset];
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target2[1] = iRgbLookupTable[((y+gc) >> 16) + ESaturateOffset];
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target2[2] = iRgbLookupTable[((y+rc) >> 16) + ESaturateOffset];
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// Lower right:
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y = 76309 * (((TInt) yb2[1]) - 16) + 32768;
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target2[3] = iRgbLookupTable[((y+bc) >> 16) + ESaturateOffset];
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target2[4] = iRgbLookupTable[((y+gc) >> 16) + ESaturateOffset];
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target2[5] = iRgbLookupTable[((y+rc) >> 16) + ESaturateOffset];
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// Next two pixels:
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target += 6;
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target2 += 6;
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yb += 2;
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yb2 += 2;
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aUBuf++;
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aVBuf++;
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cols -= 2;
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}
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// Next rows
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rows -= 2;
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aYBuf += 2*aBufWidth;
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aUBuf += (aBufWidth - iWidth)/2;
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aVBuf += (aBufWidth - iWidth)/2;
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aTarget += 2*aTargetScanlineLength;
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}
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}
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else
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{
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// No chrominance given, do a luminance-only conversion
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// Convert all rows
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while ( rows )
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{
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// Convert all pixels in this row, two at a time
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cols = iWidth;
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target = aTarget;
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while ( cols )
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{
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// Do a pixel:
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y = 76309 * (((TInt) aYBuf[0]) - 16) + 32768;
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val = iRgbLookupTable[(y >> 16) + ESaturateOffset];
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target[0] = val;
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target[1] = val;
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target[2] = val;
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// And another one:
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y = 76309 * (((TInt) aYBuf[1]) - 16) + 32768;
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val = iRgbLookupTable[(y >> 16) + ESaturateOffset];
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target[3] = val;
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target[4] = val;
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target[5] = val;
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// Next two pixels:
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target += 6;
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aYBuf += 2;
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cols -= 2;
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}
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// Next row
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rows--;
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aYBuf += aBufWidth - iWidth;
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aTarget += aTargetScanlineLength;
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}
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}
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}
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// End of File
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