// Copyright (c) 1997-2009 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:

 //

 #include "SCDRAW.H"

 #include "_WININC.H"

 TInt CDrawTwoBppScreenBitmap::InitScreen()

 	{

 	TRect drawRect;

 	GetDrawRect(drawRect);

     RWindows* window = ::WindowHandler(iScreenNo);

 	window->iDisplayMode = DisplayMode();

 	window->iEpocBitmapSize = drawRect.Size();

 	window->iEpocBitmapLinePitch = (iScanLineWords*4);

 	return KErrNone;

 	}

 void CDrawTwoBppScreenBitmap::OrientationsAvailable(TBool aOrientation[4])

 	{

 	aOrientation[EOrientationNormal] = ETrue;

 	aOrientation[EOrientationRotated90] = EFalse;

 	aOrientation[EOrientationRotated180] = EFalse;

 	aOrientation[EOrientationRotated270] = EFalse;

 	}

 void CDrawTwoBppScreenBitmap::UpdateRect(const TRect& aRect) const

 	{

 	ASSERT(aRect.iTl.iX >= 0 && aRect.iTl.iY >= 0);

 	ASSERT(aRect.iBr.iX <= iSize.iWidth);

 	ASSERT(aRect.iBr.iY <= iSize.iHeight);

 	const TUint8 gray4lookup[4] = {0, 85, 170, 255};

 	TInt lx = aRect.iTl.iX & ~0xf;

 	TInt rx = (aRect.iBr.iX + 15) & ~0xf;

 	TUint8* srcePtr = ((TUint8*)(ScanLine(aRect.iTl.iY))) + (lx / 4);

 	TUint8* srcePtrLimit = srcePtr + ((rx - lx) / 4);

 	TInt byteWidth = iScanLineWords * 4;

 	for(TInt row = aRect.iTl.iY; row < aRect.iBr.iY; row++)

 		{

 		TUint8* tempSrcePtr = srcePtr;

 		TUint8* destPixel = WinPixelAddress(lx,row);

 		while (tempSrcePtr < srcePtrLimit)

 			{

 			TUint8 pixelValue1 = *tempSrcePtr++;

 			TUint8 pixelValue2 = TUint8((pixelValue1 >> 2) & 0x03);

 			TUint8 pixelValue3 = TUint8((pixelValue1 >> 4) & 0x03);

 			TUint8 pixelValue4 = TUint8((pixelValue1 >> 6) & 0x03);

 			pixelValue1 &= 0x03;

 			TUint8 pixelGray = gray4lookup[pixelValue1];

 			destPixel[0] = pixelGray;

 			destPixel[1] = pixelGray;

 			destPixel[2] = pixelGray;

 			pixelGray = gray4lookup[pixelValue2];

 			destPixel[3] = pixelGray;

 			destPixel[4] = pixelGray;

 			destPixel[5] = pixelGray;

 			pixelGray = gray4lookup[pixelValue3];

 			destPixel[6] = pixelGray;

 			destPixel[7] = pixelGray;

 			destPixel[8] = pixelGray;

 			pixelGray = gray4lookup[pixelValue4];

 			destPixel[9] = pixelGray;

 			destPixel[10] = pixelGray;

 			destPixel[11] = pixelGray;

 			destPixel += 12;

 			}

 		srcePtr += byteWidth;

 		srcePtrLimit += byteWidth;

 		}

 	}