diff -r 000000000000 -r 5d03bc08d59c graphicsdeviceinterface/gdi/tgdi/TLINEDDA.CPP
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicsdeviceinterface/gdi/tgdi/TLINEDDA.CPP	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,244 @@
+// Copyright (c) 1998-2009 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 <e32test.h>
+#include "TTYPES.H"
+
+TestLine::TestLine(const TPoint& aStart,const TPoint& aFinish, CTTypes* aTest):
+	iStart(aStart),
+	iFinish(aFinish),
+	iTest(aTest)
+	{}
+
+/** 
+	TestLine::Test
+	
+	Method to test the functionality within the TLinearDDA class (Linear Digital Differential Analyser)
+	Called from the TTypes test script
+*/
+void TestLine::Test()
+	{
+	iLine.Construct(iStart,iFinish);
+	TestSingleStep();
+	iLine.Construct(iStart,iFinish);
+	TestSingleScanLine();
+	iLine.Construct(iStart,iFinish);
+	TestNextStep();
+	iLine.Construct(iStart,iFinish);
+	TestJumpToXCoord();
+	iLine.Construct(iStart,iFinish);
+	TestJumpToYCoord();
+	iLine.Construct(iStart,iFinish);
+	TestJumpToRect();
+	}
+
+/** 
+	TestLine::TestSingleStep
+	
+	Iterate through a line of pixels & confirm the final call to SingleStep rests on the last pixel
+*/
+void TestLine::TestSingleStep()
+	{
+	TPoint point;
+	while(!iLine.SingleStep(point))
+		{
+		iTest->TEST((point.iX>=iStart.iX && point.iX<=iFinish.iX) || (point.iX<=iStart.iX && point.iX>=iFinish.iX));
+		iTest->TEST((point.iY>=iStart.iY && point.iY<=iFinish.iY) || (point.iY<=iStart.iY && point.iY>=iFinish.iY));
+		}
+	iTest->TEST(point==iFinish);
+	}
+
+/** 
+	TestLine::TestSingleScanLine
+	
+	Iterate through each scaline & confirm successive scan lines are concatenated. 
+	Confirm the last scanline holds the endppoint that was specified during construction of TLinearDDA
+*/
+void TestLine::TestSingleScanLine()
+	{
+	TPoint point1,point2;
+	if(!iLine.SingleScanline(point1,point2))
+		iTest->TEST(point1==iStart);
+	TInt lastycoord=point1.iY;
+	while(!iLine.SingleScanline(point1,point2))
+		{
+		iTest->TEST((point1.iX>=iStart.iX && point1.iX<=iFinish.iX) || (point1.iX<=iStart.iX && point1.iX>=iFinish.iX));
+		iTest->TEST((point1.iY>=iStart.iY && point1.iY<=iFinish.iY) || (point1.iY<=iStart.iY && point1.iY>=iFinish.iY));
+		iTest->TEST((point2.iX>=iStart.iX && point2.iX<=iFinish.iX) || (point2.iX<=iStart.iX && point2.iX>=iFinish.iX));
+		iTest->TEST(point1.iY==point2.iY);
+		iTest->TEST(Abs(point1.iY-lastycoord)==1);
+		lastycoord=point1.iY;
+		}
+	iTest->TEST(point2==iFinish);
+	}
+
+/** 
+	TestLine::TestNextStep
+	
+	Iterate trhough a the start position of each scanline & confirm they are concatenated. 
+	Confirm the last scanline holds the endpoint specified during TLinearDDA construction (iFinish)
+*/
+void TestLine::TestNextStep()
+	{
+	TPoint point,oldpoint;
+	iLine.NextStep(oldpoint);
+	iTest->TEST(oldpoint==iStart);
+	while(!iLine.NextStep(point))
+		{
+		iTest->TEST((point.iX>=iStart.iX && point.iX<=iFinish.iX) || (point.iX<=iStart.iX && point.iX>=iFinish.iX));
+		iTest->TEST((point.iY>=iStart.iY && point.iY<=iFinish.iY) || (point.iY<=iStart.iY && point.iY>=iFinish.iY));
+		iTest->TEST(Abs(point.iY-oldpoint.iY)==1);
+		oldpoint=point;
+		}
+	iTest->TEST(point==iFinish);
+	}
+
+/** 
+	TestLine::TestJumpToRect
+	
+	Test the JumpToRect functionality, confirming that the start of the clipping rectangle is correctly detected (note we iterate through SingleStep to find the position exactly)
+*/
+void TestLine::TestJumpToRect()
+	{
+	TPoint midpoint=iStart+iFinish;
+	midpoint.iX>>=1;
+	midpoint.iY>>=1;
+	TSize rsize(Abs(iStart.iX-iFinish.iX),Abs(iStart.iY-iFinish.iY));
+	TRect rect(TPoint(iFinish.iX-(rsize.iWidth>>1),iFinish.iY-(rsize.iHeight>>1)),rsize);
+	TRect largerect(TPoint(iFinish.iX-(rsize.iWidth<<1),iFinish.iY-(rsize.iHeight<<1)),TSize(rsize.iWidth<<2,rsize.iHeight<<2));
+	TRect offsetrect(rect);
+	offsetrect.Move(iStart-iFinish);
+	if(iFinish.iX>iStart.iX)
+		offsetrect.Move(TPoint(-(rsize.iWidth>>2),0));
+	else
+		offsetrect.Move(TPoint(rsize.iWidth>>2,0));
+	if(iFinish.iY>iStart.iY)
+		offsetrect.Move(TPoint(0,(rsize.iHeight>>1)+4));
+	else
+		offsetrect.Move(TPoint(0,-(rsize.iHeight>>1)-4));
+	TPoint intersect,point;
+	TLinearDDA line;
+	iLine.JumpToRect(rect);
+	iLine.SingleStep(intersect);
+	line.Construct(iStart,iFinish);
+	while(!line.SingleStep(point))
+		if(point==intersect)
+			break;
+	iTest->TEST(point==intersect);
+	while(!iLine.SingleStep(intersect))
+		{
+		line.SingleStep(point);
+		iTest->TEST(point==intersect);
+		}
+	line.SingleStep(point);
+	iTest->TEST(point==intersect);
+	iTest->TEST(intersect==iFinish);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToRect(largerect);
+	iLine.SingleStep(point);
+	iTest->TEST(Abs(point.iX-iStart.iX)<=1);
+	iTest->TEST(Abs(point.iY-iStart.iY)<=1);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToRect(offsetrect);
+	iLine.SingleStep(point);
+	if(rsize.iWidth>rsize.iHeight)
+		iTest->TEST(point==iStart);
+	else
+		iTest->TEST(Min(Abs(point.iY-offsetrect.iTl.iY),Abs(point.iY-offsetrect.iBr.iY))==1);
+	}
+
+/** 
+	TestLine::TestJumpToXCoord
+	
+	Test the JumpToXCoord functionailty, confirming the positions by SingleStep calls
+*/
+void TestLine::TestJumpToXCoord()
+	{
+	TInt xc1=(iStart.iX+iFinish.iX)>>1;
+	TInt xc2=iStart.iX;
+	TInt xc3=iFinish.iX;
+	TInt xc4=Min(iStart.iX,iFinish.iX)-Abs(xc1);
+	TInt xc5=Max(iStart.iX,iFinish.iX)+Abs(xc1);
+	TInt y=0;
+	TPoint intersect,point;
+	TLinearDDA line;
+	iLine.JumpToXCoord(xc1,y);
+	line.Construct(iStart,iFinish);
+	while(!line.SingleStep(point))
+		if(point.iX==xc1)
+			break;
+	iTest->TEST(y==point.iY);
+	while(!iLine.SingleStep(point))
+		{
+		line.SingleStep(intersect);
+		iTest->TEST(point.iX==intersect.iX);
+		iTest->TEST(point.iY==intersect.iY);
+		}
+	TBool done=line.SingleStep(intersect);
+	iTest->TEST(done);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToXCoord(xc2,y);
+	iTest->TEST(y==iStart.iY);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToXCoord(xc3,y);
+	iLine.SingleStep(point);
+	iTest->TEST(point.iX==xc3);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToXCoord(xc4,y);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToXCoord(xc5,y);
+	}
+
+/** 
+	TestLine::TestJumpToYCoord
+	
+	Test the JumpToYCoord functionailty, confirming the positions by SingleStep calls
+*/
+void TestLine::TestJumpToYCoord()
+	{
+	TInt yc1=(iStart.iY+iFinish.iY)>>1;
+	TInt yc2=iStart.iY;
+	TInt yc3=iFinish.iY;
+	TInt yc4=Min(iStart.iY,iFinish.iY)-Abs(yc1);
+	TInt yc5=Max(iStart.iY,iFinish.iY)+Abs(yc1);
+	TInt x=0;
+	TPoint intersect,point;
+	TLinearDDA line;
+	iLine.JumpToYCoord(x,yc1);
+	line.Construct(iStart,iFinish);
+	while(!line.SingleStep(point))
+		if(point.iY==yc1)
+			break;
+	iTest->TEST(TPoint(x,yc1)==point);
+	while(!iLine.SingleStep(point))
+		{
+		line.SingleStep(intersect);
+		iTest->TEST(point==intersect);
+		}
+	TBool done=line.SingleStep(intersect);
+	iTest->TEST(done);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToYCoord(x,yc2);
+	iTest->TEST(x==iStart.iX);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToYCoord(x,yc3);
+	iLine.SingleStep(point);
+	iTest->TEST(point.iY==yc3);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToYCoord(x,yc4);
+	iLine.Construct(iStart,iFinish);
+	iLine.JumpToYCoord(x,yc5);
+	}
+