sl@0: // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "directgdiadapter.h"
sl@0: #include "swdirectgdiengine.h"
sl@0: #include "swdirectgdiimagesourceimpl.h"
sl@0: #include "swdirectgdidriverimpl.h"
sl@0: #include <bitdrawinterfaceid.h>
sl@0: #include <e32cmn.h>
sl@0: #include <bitdraw.h>
sl@0: #include <bmalphablend.h>
sl@0: #include <graphics/directgdidrawablesource.h>
sl@0: #include <pixelformats.h>
sl@0: #include "pixelutil.h"
sl@0: 
sl@0: /**
sl@0: Helper class to deal with the case of blending 32-bit MAP source into 16-bit target which is not 
sl@0: supported by screen driver CDrawSixteenBppBitmap implementation.
sl@0: 
sl@0: @publishedPartner
sl@0: @prototype
sl@0: @deprecated
sl@0: */
sl@0: class TDrawDeviceWrapper
sl@0: 	{
sl@0: public:
sl@0: 	TDrawDeviceWrapper(CFbsDrawDevice* aDrawDevice, CGraphicsContext::TDrawMode aDrawMode);
sl@0: 	inline void WriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode);
sl@0: private:
sl@0: 	inline TUint16 ConvertTo64K(TUint32 aColor);
sl@0: 	inline TUint16 Blend16MapTo64K(TUint16 aDest, TUint32 aSrc);
sl@0: 	void BlendLine16MapTo64K(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode);
sl@0: 	void OriginalWriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode);
sl@0: 
sl@0: private:
sl@0: 	CFbsDrawDevice* iDrawDevice;
sl@0: 	TUint32* iBits;
sl@0: 
sl@0: 	typedef void (TDrawDeviceWrapper::*TWriteLineFunc)(TInt,TInt,TInt,TUint32*,CGraphicsContext::TDrawMode);
sl@0: 	TWriteLineFunc iWriteLineFunc;
sl@0: 	};
sl@0: 
sl@0: TDrawDeviceWrapper::TDrawDeviceWrapper(CFbsDrawDevice* aDrawDevice, CGraphicsContext::TDrawMode aDrawMode):
sl@0: 	iDrawDevice(aDrawDevice)
sl@0: 	{
sl@0: 	TAny* interface = NULL;
sl@0: 	TInt err = iDrawDevice->GetInterface(KFastBlit2InterfaceID, interface);
sl@0: 	// interface is guaranted to exist for 16-bit and 32-bit draw device
sl@0: 	GRAPHICS_ASSERT_DEBUG(err == KErrNone, EDirectGdiPanicUnexpectedError);
sl@0: 
sl@0: 	iBits = (TUint32*) reinterpret_cast<MFastBlit2*>(interface)->Bits();
sl@0: 	
sl@0: 	// setup which funtion to call here rather tha making decision inside WriteLine which is usually called within
sl@0: 	// a tight scanline loop
sl@0: 	iWriteLineFunc = iDrawDevice->DisplayMode() == EColor64K && aDrawMode == CGraphicsContext::EDrawModePEN ? 
sl@0: 			&TDrawDeviceWrapper::BlendLine16MapTo64K : &TDrawDeviceWrapper::OriginalWriteLine;
sl@0: 	}
sl@0: 
sl@0: inline void TDrawDeviceWrapper::WriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode)
sl@0: 	{
sl@0: 	// calling member functions via pointer to member functions i.e.
sl@0: 	// (object.*member_fn)(arg)
sl@0: 	//
sl@0: 	(this->*iWriteLineFunc)(aX, aY, aLength, aBuffer, aDrawMode);
sl@0: 	}
sl@0: 
sl@0: void TDrawDeviceWrapper::OriginalWriteLine(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode aDrawMode)
sl@0: 	{
sl@0: 	iDrawDevice->WriteLine(aX, aY, aLength, aBuffer, aDrawMode);
sl@0: 	}
sl@0: 
sl@0: void TDrawDeviceWrapper::BlendLine16MapTo64K(TInt aX, TInt aY, TInt aLength, TUint32* aBuffer, CGraphicsContext::TDrawMode)
sl@0: 	{
sl@0: 	TUint16* pixelPtr = reinterpret_cast<TUint16*>(iBits);
sl@0: 	pixelPtr += (aY * iDrawDevice->LongWidth()) + aX;
sl@0: 	const TUint32* bufferPtr = aBuffer;
sl@0: 	const TUint32* bufferPtrLimit = bufferPtr + aLength;
sl@0: 
sl@0: 	while (bufferPtr < bufferPtrLimit)
sl@0: 		{
sl@0: 		*pixelPtr = Blend16MapTo64K(*pixelPtr, *bufferPtr);
sl@0: 		++bufferPtr;
sl@0: 		++pixelPtr;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: inline TUint16 TDrawDeviceWrapper::ConvertTo64K(TUint32 aSrc)
sl@0: 	{
sl@0: 	TInt col = (aSrc & 0x0000f8) >> 3;
sl@0: 	col |= (aSrc & 0x00fc00) >> 5;
sl@0: 	col |= (aSrc & 0xf80000) >> 8;
sl@0: 	
sl@0: 	return col;
sl@0: 	}
sl@0: 	
sl@0: inline TUint16 TDrawDeviceWrapper::Blend16MapTo64K(TUint16 aDst, TUint32 aSrc)
sl@0: 	{
sl@0: 	const TInt alpha = aSrc >> 24;
sl@0: 
sl@0: 	if(alpha == 0x00)
sl@0: 		{
sl@0: 		return aDst;
sl@0: 		}
sl@0: 
sl@0: 	if (alpha == 0xff)
sl@0: 		{
sl@0: 		return ConvertTo64K(aSrc);
sl@0: 		}
sl@0: 
sl@0: 	// extract source components from 16MAP
sl@0: 	const TInt src_rb = aSrc & 0x00ff00ff;
sl@0: 	const TInt src_g = aSrc & 0x0000ff00;
sl@0: 	const TInt oneMinusAlpha = 0x0100 - alpha;
sl@0: 
sl@0: 	// extract destination components from 64K format
sl@0:     TInt dr = (aDst & 0xf800) >> 8;
sl@0:     dr += dr >> 5;
sl@0:     TInt dg = (aDst & 0x07e0) >> 3;
sl@0:     dg += dg >> 6;
sl@0:     TInt db = (aDst & 0x001f) << 3;
sl@0:     db += db >> 5;
sl@0: 
sl@0: 	// combine red and blue components into a word to combine mult in one go
sl@0: 	TInt dst_rb = (dr << 16) | db;
sl@0: 	TInt dst_g = dg << 8;
sl@0: 
sl@0: 	// dst and src are in pre-multiplied format (64K can be treated both as pre or non-pre)
sl@0: 	// dst = src + (1-alpha) * dst
sl@0: 	//
sl@0: 	dst_rb = (src_rb + ((oneMinusAlpha * dst_rb) >> 8)) & 0x00ff00ff;
sl@0: 	dst_g = (src_g + ((oneMinusAlpha * dst_g) >> 8)) & 0x0000ff00;
sl@0: 	
sl@0: 	const TUint32 argb = 0xff000000 | dst_rb | dst_g;
sl@0: 	return ConvertTo64K(argb);
sl@0: 	}
sl@0: 
sl@0: //
sl@0: // implements MDirectGdiEngine interfaces
sl@0: //
sl@0: 
sl@0: /**
sl@0: @see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,const TDesC8&)
sl@0: */
sl@0: void CSwDirectGdiEngine::DrawResource(
sl@0: 		const TRect& aDestRect,
sl@0: 		const RDirectGdiDrawableSource& aSource,
sl@0: 		const TDesC8& /*aParam*/)
sl@0: 	{
sl@0: 	// DirectGDI reference implementation only support pixel based resource
sl@0: 	// see CSwDirectGdiDriverImpl::CreateDrawableSource()
sl@0: 	//
sl@0: 	CSwDirectGdiImageSourceImpl* imgSrc = NULL;
sl@0: 	TSize imgSize;
sl@0: 	if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
sl@0: 		{
sl@0: 		return;
sl@0: 		}
sl@0: 
sl@0: 	// drawing resource unscaled with no rotation
sl@0: 	//
sl@0: 	DrawResourceCommon(aDestRect, imgSrc, TRect(TPoint(0,0), imgSize), DirectGdi::EGraphicsRotationNone);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: @see MDirectGdiEngine::DrawResource(const TPoint&,const RDirectGdiDrawableSource&,DirectGdi::TGraphicsRotation)
sl@0: */
sl@0: void CSwDirectGdiEngine::DrawResource(const TPoint& aPos,
sl@0: 		const RDirectGdiDrawableSource& aSource,
sl@0: 		DirectGdi::TGraphicsRotation aRotation)
sl@0: 	{
sl@0: 	CSwDirectGdiImageSourceImpl* imgSrc = NULL;
sl@0: 	TSize imgSize;
sl@0: 	if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
sl@0: 		{
sl@0: 		return;
sl@0: 		}
sl@0: 
sl@0: 	// drawing resource unscaled
sl@0: 	//
sl@0: 	// rotation will be applied before scaling, we must create destination rectangle 
sl@0: 	// that match the size of rotated image
sl@0: 
sl@0: 	TRect destRect(aPos, imgSize);
sl@0: 	if (aRotation==DirectGdi::EGraphicsRotation90 || aRotation==DirectGdi::EGraphicsRotation270)
sl@0: 		{
sl@0: 		// keep the top left corner in the same position but swap width and height
sl@0: 		destRect.SetWidth(imgSize.iHeight);
sl@0: 		destRect.SetHeight(imgSize.iWidth);
sl@0: 		}
sl@0: 
sl@0: 	DrawResourceCommon(destRect, imgSrc, TRect(TPoint(0,0), imgSize), aRotation);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: @see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,DirectGdi::TGraphicsRotation)
sl@0: */
sl@0: void CSwDirectGdiEngine::DrawResource(const TRect& aDestRect,
sl@0: 		const RDirectGdiDrawableSource& aSource,
sl@0: 		DirectGdi::TGraphicsRotation aRotation)
sl@0: 	{
sl@0: 	// aDestRect is not empty when we reach here
sl@0: 	//
sl@0: 	CSwDirectGdiImageSourceImpl* imgSrc = NULL;
sl@0: 	TSize imgSize;
sl@0: 	if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
sl@0: 		{
sl@0: 		return;
sl@0: 		}
sl@0: 
sl@0: 	DrawResourceCommon(aDestRect, imgSrc, TRect(TPoint(0,0), imgSize), aRotation);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: @see MDirectGdiEngine::DrawResource(const TRect&,const RDirectGdiDrawableSource&,const TRect&,DirectGdi::TGraphicsRotation)
sl@0: */
sl@0: void CSwDirectGdiEngine::DrawResource(
sl@0: 		const TRect& aDestRect,				
sl@0: 		const RDirectGdiDrawableSource& aSource, 
sl@0: 		const TRect& aSrcRect,
sl@0: 		DirectGdi::TGraphicsRotation aRotation)
sl@0: 	{
sl@0: 	// pre:
sl@0: 	// aDestRect and aSrcRect are not empty
sl@0: 	//
sl@0: 	CSwDirectGdiImageSourceImpl* imgSrc = NULL;
sl@0: 	TSize imgSize;
sl@0: 	if (CheckImageSource(aSource.Handle(), imgSrc, &imgSize) != KErrNone)
sl@0: 		{
sl@0: 		return;
sl@0: 		}
sl@0: 
sl@0: 	// check source rectangle is fully contained within the image resource extent
sl@0: 	if (aSrcRect.iTl.iX < 0 ||
sl@0: 		aSrcRect.iTl.iY < 0 ||
sl@0: 		aSrcRect.iBr.iX > imgSize.iWidth ||
sl@0: 		aSrcRect.iBr.iY > imgSize.iHeight)
sl@0: 		{
sl@0: 		iDriver->SetError(KErrArgument);
sl@0: 		return;
sl@0: 		}   	
sl@0: 	
sl@0: 	DrawResourceCommon(aDestRect, imgSrc, aSrcRect, aRotation);
sl@0: 	}
sl@0: 
sl@0: //
sl@0: // internal functions
sl@0: //
sl@0: /**
sl@0: Checks image resource is fully constructed and registered with the driver.
sl@0: 
sl@0: @param  aHandle A valid handle to an image source.
sl@0: @param  aImg On return, contains the image source.
sl@0: @param  aSize If not NULL, will contain the dimensions of the image source.
sl@0: @return KErrNone if successful, KErrBadHandle if aHandle is not a valid handle to an image source.
sl@0: */
sl@0: TInt CSwDirectGdiEngine::CheckImageSource(TInt aHandle, CSwDirectGdiImageSourceImpl*& aImg, TSize* aSize)
sl@0: 	{
sl@0: 	// check image exist
sl@0: 	if (!iDriver->ValidImageSource(aHandle))
sl@0: 		{
sl@0: 		// replace KErrNotFound
sl@0: 		const TInt err = KErrBadHandle;
sl@0: 		iDriver->SetError(err);
sl@0: 		return err;
sl@0: 		}
sl@0: 	
sl@0: 	aImg = reinterpret_cast<CSwDirectGdiImageSourceImpl*>(aHandle);
sl@0: 
sl@0: 	// RSgImage cannot be created with zero size, so there is no point in validating its size and
sl@0: 	// simply return image size if requested
sl@0: 	if (aSize)
sl@0: 		{		
sl@0: 		*aSize = aImg->Size();
sl@0: 		}
sl@0: 
sl@0: 	return KErrNone;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Implements common DrawResource() functionality used by all DrawResource() variants.
sl@0: */
sl@0: void CSwDirectGdiEngine::DrawResourceCommon(
sl@0: 		const TRect& aDestRect,
sl@0: 		const CSwDirectGdiImageSourceImpl* aImg,
sl@0: 		const TRect& aSrcRect,
sl@0: 		DirectGdi::TGraphicsRotation aRotation)
sl@0: 	{
sl@0: 	// pre:
sl@0: 	// aDestRect and aSrcRect are not empty
sl@0: 	// aSrcRect is within the image extent
sl@0: 	//
sl@0: 	// translate relative coord to target absolute coord system
sl@0: 	TRect destRectAbs(aDestRect);
sl@0: 	destRectAbs.Move(iOrigin);
sl@0: 
sl@0: 	// check whether we need to blend or write
sl@0: 	const TBool opaqueSource = (!PixelFormatUtil::HasAlpha(aImg->PixelFormat())) && (iDrawMode == DirectGdi::EDrawModePEN);
sl@0: 	if (opaqueSource)
sl@0: 		{
sl@0: 		iDrawMode = DirectGdi::EDrawModeWriteAlpha;
sl@0: 		}
sl@0: 
sl@0: 	// repeat drawing op for each rectangle in the clipping region
sl@0: 	const TInt numOfRects = iDefaultRegionPtr->Count();	
sl@0: 	for (TInt idx = 0; idx < numOfRects; ++idx)
sl@0: 		{
sl@0: 		TRect clipRectAbs = (*iDefaultRegionPtr)[idx];
sl@0: 		if (!clipRectAbs.Intersects(destRectAbs))
sl@0: 			{
sl@0: 			continue;
sl@0: 			}
sl@0: 
sl@0: 		// intersect current clip rect with dest rect to get actual draw area
sl@0: 		clipRectAbs.Intersection(destRectAbs);
sl@0: 		DoDrawResource(destRectAbs, aImg, aSrcRect, aRotation, clipRectAbs);
sl@0: 
sl@0: 		iDrawDevice->UpdateRegion(clipRectAbs);
sl@0: 		}
sl@0: 	
sl@0: 	if (opaqueSource)
sl@0: 		{
sl@0: 		iDrawMode = DirectGdi::EDrawModePEN;
sl@0: 		}	
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Rotate a given rectangle 90 degree clockwise around the specified origin.
sl@0: */
sl@0: void CSwDirectGdiEngine::Rotate90(TRect& aRect, const TPoint& aOrigin)
sl@0: 	{
sl@0: 	// rotated bottom-left become top-left of rotated rect
sl@0: 	//
sl@0: 	TPoint bl(aRect.iTl.iX, aRect.iBr.iY);
sl@0: 	const TInt w = aRect.Width();
sl@0: 	const TInt h = aRect.Height();
sl@0: 	
sl@0: 	const TPoint dbl = bl - aOrigin;
sl@0: 	bl.iX = aOrigin.iX - dbl.iY;
sl@0: 	bl.iY = aOrigin.iY + dbl.iX;
sl@0: 
sl@0: 	aRect = TRect(bl, TSize(h,w));
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Rotate a given rectangle 180 degree clockwise around the specified origin.
sl@0: */
sl@0: void CSwDirectGdiEngine::Rotate180(TRect& aRect, const TPoint& aOrigin)
sl@0: 	{
sl@0: 	// rotated bottom-right become top-left of rotated rect
sl@0: 	//
sl@0: 	TPoint br(aRect.iBr);
sl@0: 	const TSize sz = aRect.Size();
sl@0: 
sl@0: 	const TPoint dbr = br - aOrigin;
sl@0: 	br.iX = aOrigin.iX - dbr.iX;
sl@0: 	br.iY = aOrigin.iY - dbr.iY;
sl@0: 
sl@0: 	aRect = TRect(br, sz);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Rotate a given rectangle 270 degree clockwise around the specified origin.
sl@0: */
sl@0: void CSwDirectGdiEngine::Rotate270(TRect& aRect, const TPoint& aOrigin)
sl@0: 	{
sl@0: 	// rotated top-right become top-left of rotated rect
sl@0: 	//
sl@0: 	TPoint tr(aRect.iBr.iX, aRect.iTl.iY);
sl@0: 	const TInt w = aRect.Width();
sl@0: 	const TInt h = aRect.Height();
sl@0: 	
sl@0: 	const TPoint dtr = tr - aOrigin;
sl@0: 	tr.iX = aOrigin.iX + dtr.iY;
sl@0: 	tr.iY = aOrigin.iY - dtr.iX;
sl@0: 
sl@0: 	aRect = TRect(tr, TSize(h,w));
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Tests that the size of a given rotated rectangle match the image source extent.
sl@0: */
sl@0: TBool CSwDirectGdiEngine::RotatedSizeMatch(const TRect& aDst, const TRect& aSrc, DirectGdi::TGraphicsRotation aRot)
sl@0: 	{
sl@0: 	if (aRot==DirectGdi::EGraphicsRotationNone || aRot==DirectGdi::EGraphicsRotation180)
sl@0: 		{
sl@0: 		return aDst.Size()==aSrc.Size();
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		return aDst.Width()==aSrc.Height() && aDst.Height()==aSrc.Width();
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Draws a rectangular area of resource and apply rotation and/or scaling if requested.
sl@0: */
sl@0: void CSwDirectGdiEngine::DoDrawResource(
sl@0: 		const TRect& aDestRectAbs,
sl@0: 		const CSwDirectGdiImageSourceImpl* aImg,
sl@0: 		const TRect& aSrcRect,
sl@0: 		DirectGdi::TGraphicsRotation aRotation,
sl@0: 		const TRect& aClipRectAbs)
sl@0: 	{
sl@0: 	// pre:
sl@0: 	// SetClippingRegion() already check that clipping region is always contained
sl@0: 	// within device full extent.
sl@0: 
sl@0: 	// check src rect match the size of rotated dest rect
sl@0: 	if (RotatedSizeMatch(aDestRectAbs, aSrcRect, aRotation))
sl@0: 		{
sl@0: 		// aClipRect is the effective drawing clipped area, it has been intersected with dest rect by the
sl@0: 		// calling function/DoDrawResourceCommon() and it is not empty when we reach here
sl@0: 
sl@0: 		// image size has been checked at the top level DrawResource() no need to check it again
sl@0: 
sl@0: 		// use aClipRect to determine how much area should be read from the image and transform
sl@0: 		// the effective read area into source rect depending on rotation parameter
sl@0: 		
sl@0: 		// start with aClipRect
sl@0: 		TRect xformSrcRect(aClipRectAbs);
sl@0: 		switch (aRotation)
sl@0: 			{
sl@0: 			case DirectGdi::EGraphicsRotationNone:
sl@0: 				// align top-left corner of dest rect with top-left corner of src rect
sl@0: 				xformSrcRect.Move(aSrcRect.iTl - aDestRectAbs.iTl);
sl@0: 				break;
sl@0: 			case DirectGdi::EGraphicsRotation90:
sl@0: 				{
sl@0: 				// align top-right corner of dest rect with top-left corner of src rect
sl@0: 				xformSrcRect.Move(aSrcRect.iTl - TPoint(aDestRectAbs.iBr.iX, aDestRectAbs.iTl.iY));
sl@0: 				// rotate 270 (-90) degree using top-left corner of src rect as pivot point
sl@0: 				Rotate270(xformSrcRect, aSrcRect.iTl);
sl@0: 				}
sl@0: 				break;
sl@0: 			case DirectGdi::EGraphicsRotation180:
sl@0: 				{
sl@0: 				// align bottom-right corner of dest rect with top-left corner of src rect
sl@0: 				xformSrcRect.Move(aSrcRect.iTl - aDestRectAbs.iBr);
sl@0: 				// rotate 180 (-180) degree using top-left corner of src rect as pivot point
sl@0: 				Rotate180(xformSrcRect, aSrcRect.iTl);
sl@0: 				}
sl@0: 				break;
sl@0: 			case DirectGdi::EGraphicsRotation270:
sl@0: 				{
sl@0: 				// align bottom-left corner of dest rect with top-left corner of src rect
sl@0: 				xformSrcRect.Move(aSrcRect.iTl - TPoint(aDestRectAbs.iTl.iX, aDestRectAbs.iBr.iY));
sl@0: 				// rotate 90 (-270) degree using top-left corner of src rect as pivot point
sl@0: 				Rotate90(xformSrcRect, aSrcRect.iTl);
sl@0: 				}
sl@0: 				break;
sl@0: 
sl@0: 			// no need for extra check, aRotation has been checked at generic layer
sl@0: 			}
sl@0: 
sl@0: 		DoBlitResource(aClipRectAbs.iTl, aImg, xformSrcRect, aRotation);
sl@0: 		return;
sl@0: 		}
sl@0: 
sl@0: 	DoScaledBlitResource(aDestRectAbs, aImg, aSrcRect, aRotation, aClipRectAbs);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Draws a rectangular area of resource rotated with no scaling.
sl@0: @panic DGDIAdapter 1009, if the pixel format of the draw device is unknown (debug only). 
sl@0: */
sl@0: void CSwDirectGdiEngine::DoBlitResource(
sl@0: 		const TPoint& aDest,
sl@0: 		const CSwDirectGdiImageSourceImpl* aImg,
sl@0: 		const TRect& aSrcRect,
sl@0: 		DirectGdi::TGraphicsRotation aRotation)
sl@0: 	{		
sl@0: 	// pre:
sl@0: 	// aDest is the top-left of clipped destination rectangle i.e. intersection of user destination
sl@0: 	// rectangle with current clipping rect
sl@0: 	// aSrcRect is rotated clipped read area i.e. effective read area with respect to original 
sl@0: 	// image orientation i.e.it no longer represents user specified source rect.
sl@0: 
sl@0: 	// no need to do extra check on parameters here because:
sl@0: 	// aDest is guaranteed to be within device drawing area
sl@0: 	// aSrcRect is guaranteed to be within image source area
sl@0: 	
sl@0: 	const TUidPixelFormat devFormat = PixelFormatUtil::ConvertToPixelFormat(iDrawDevice->DisplayMode());
sl@0: 	GRAPHICS_ASSERT_DEBUG(devFormat != EUidPixelFormatUnknown, EDirectGdiPanicInvalidDisplayMode);
sl@0: 
sl@0: 	const TUidPixelFormat imgFormat = aImg->PixelFormat();
sl@0: 	const TUint32* imgAddr = reinterpret_cast<TUint32*>(aImg->DataBuffer());
sl@0: 	const TInt imgStride = aImg->Stride();
sl@0: 	const TSize imgSize = aImg->Size();
sl@0: 	const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode);
sl@0: 	
sl@0: 	const TInt width = aSrcRect.Width();
sl@0: 	const TInt height = aSrcRect.Height();
sl@0: 	// write scanline starting from top dest row
sl@0: 	TInt destY = aDest.iY;
sl@0: 	// setup pixel reader toolkit
sl@0: 	TPixelBufferReader reader(imgAddr, imgSize, imgStride, imgFormat);
sl@0: 	TDrawDeviceWrapper writer(iDrawDevice, GcDrawMode(iDrawMode));
sl@0: 	
sl@0: 	//
sl@0: 	// special case when rotation is none
sl@0: 	//
sl@0: 	if (aRotation == DirectGdi::EGraphicsRotationNone)
sl@0: 		{
sl@0: 		TAny* interface = NULL;
sl@0: 	
sl@0: 		// source and destination format match and using write alpha mode i.e. reduce blit to memcpy
sl@0: 		if (iDrawMode == DirectGdi::EDrawModeWriteAlpha && devFormat == imgFormat)
sl@0: 			{
sl@0: 			TInt err = iDrawDevice->GetInterface(KFastBlit2InterfaceID, interface);
sl@0: 			if (err == KErrNone)
sl@0: 				{
sl@0: 				GRAPHICS_ASSERT_DEBUG(interface, EDirectGdiPanicInvalidPointer);
sl@0: 				MFastBlit2* fblit = static_cast<MFastBlit2*>(interface);
sl@0: 				err = fblit->WriteBitmapBlock(aDest, imgAddr, imgStride, imgSize, aSrcRect);
sl@0: 				if (err == KErrNone)
sl@0: 					{
sl@0: 					return;
sl@0: 					}
sl@0: 				}
sl@0: 			}
sl@0: 
sl@0: 		// fallback from MFastBlit2  when source and destination format match. 
sl@0: 		// Note that there was previously an optimization added here that used MFlastBlend if 
sl@0: 		// available, however it did not work correctly for some cases using DrawResource so has been 
sl@0: 		// removed from this code. (A source drawn with OpenGLES on to a target in XRGB_8888 format
sl@0: 		// actually had alpha in the unused channel which was being drawn by MFastBlend)
sl@0: 		if (devFormat == imgFormat)
sl@0: 			{
sl@0: 			for (TInt row=aSrcRect.iTl.iY; row<aSrcRect.iBr.iY; ++row,++destY)
sl@0: 				{
sl@0: 				const TPoint pos(aSrcRect.iTl.iX, row);
sl@0: 				const TUint32* slptr = reader.GetPixelAddr(pos);
sl@0: 				writer.WriteLine(aDest.iX, destY, width, const_cast<TUint32*>(slptr), drawMode);
sl@0: 				}
sl@0: 			
sl@0: 			return;
sl@0: 			}
sl@0: 
sl@0: 		// there is one additional case that can be optimised by eleminating copy when:
sl@0: 		// rotation : none
sl@0: 		// scaling 	: none
sl@0: 		// dst		: opaque
sl@0: 		// src		: has alpha and premultiplied
sl@0: 		// mode 	: PEN
sl@0: 		}
sl@0: 
sl@0: 	//
sl@0: 	// generic cases
sl@0: 	//
sl@0: 	// copying is necessary either to convert pixel format or to read back buffer in reverse order 
sl@0: 	// to achieve rotation
sl@0: 	//
sl@0: 	const TInt scanLineBytes = iDrawDevice->ScanLineBytes();
sl@0: 	TUint32* scanLineBuffer = iDrawDevice->ScanLineBuffer();
sl@0: 	TPtr8 scanLineDes(reinterpret_cast<TUint8*>(scanLineBuffer),scanLineBytes,scanLineBytes);
sl@0: 
sl@0: 	// if destination is opaque e.g. RGB_565, XRGB_8888 and the source has alpha, it shall blend
sl@0: 	// (because iDrawMode is set to WritePEN)
sl@0: 	// we treat opaque destination as in pre-multiplied format (with alpha value 1), and read the 
sl@0: 	// source in pre-multiplied format too, to enable optimum blending computation i.e.
sl@0: 	// "src + (1-alpha) * dst"
sl@0: 	const TUidPixelFormat readFormat = !PixelFormatUtil::HasAlpha(devFormat) &&
sl@0: 							iDrawMode == DirectGdi::EDrawModePEN ?
sl@0: 							EUidPixelFormatARGB_8888_PRE : devFormat;
sl@0: 
sl@0: 	if (aRotation == DirectGdi::EGraphicsRotationNone)
sl@0: 		{
sl@0: 		// general fallback from FastBlendBitmap
sl@0: 		//
sl@0: 		const TInt readLen = width;
sl@0: 		// normal read scanline, left to right
sl@0: 		//
sl@0: 		for (TInt row=aSrcRect.iTl.iY; row<aSrcRect.iBr.iY; ++row,++destY)
sl@0: 			{
sl@0: 			const TPoint pos(aSrcRect.iTl.iX, row);
sl@0: 			reader.GetScanLine(scanLineDes,pos, readLen, readFormat, TPixelBufferReader::EReadHorizontal);
sl@0: 			writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
sl@0: 			}
sl@0: 		}
sl@0: 	else if (aRotation == DirectGdi::EGraphicsRotation90)
sl@0: 		{
sl@0: 		const TInt readLen = height;
sl@0: 		// read scanline vertically from bottom to up, and from the lef-most column
sl@0: 		//
sl@0: 		for (TInt col=aSrcRect.iTl.iX; col<aSrcRect.iBr.iX; ++col,++destY)
sl@0: 			{
sl@0: 			const TPoint pos(col, aSrcRect.iBr.iY-1);
sl@0: 			reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadVerticalReverse);
sl@0: 			writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
sl@0: 			}
sl@0: 		}
sl@0: 	else if (aRotation == DirectGdi::EGraphicsRotation180)
sl@0: 		{
sl@0: 		const TInt readLen = width;
sl@0: 		// read scanline from right to left, starting from the most bottom scanline
sl@0: 		//
sl@0: 		for (TInt row=aSrcRect.iBr.iY-1; row>=aSrcRect.iTl.iY; --row,++destY)
sl@0: 			{
sl@0: 			const TPoint pos(aSrcRect.iBr.iX-1, row);
sl@0: 			reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadHorizontalReverse);
sl@0: 			writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
sl@0: 			}
sl@0: 		}
sl@0: 	else if (aRotation == DirectGdi::EGraphicsRotation270)
sl@0: 		{
sl@0: 		const TInt readLen = height;
sl@0: 		// read scanline vertically top to bottom, and from the right-most column
sl@0: 		//
sl@0: 		for (TInt col=aSrcRect.iBr.iX-1; col>=aSrcRect.iTl.iX; --col,++destY)
sl@0: 			{
sl@0: 			const TPoint pos(col, aSrcRect.iTl.iY);
sl@0: 			reader.GetScanLine(scanLineDes, pos, readLen, readFormat, TPixelBufferReader::EReadVertical);
sl@0: 			writer.WriteLine(aDest.iX, destY, readLen, scanLineBuffer, drawMode);
sl@0: 			}
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Draws a rectangular area of resource rotated and/or scaled up/down.
sl@0: @panic DGDIAdapter 1009, if the pixel format of the draw device is unknown (debug only).
sl@0: */
sl@0: void CSwDirectGdiEngine::DoScaledBlitResource(
sl@0: 		const TRect& aDestRectAbs,
sl@0: 		const CSwDirectGdiImageSourceImpl* aImg,
sl@0: 		const TRect& aSrcRect,
sl@0: 		DirectGdi::TGraphicsRotation aRotation,
sl@0: 		const TRect& aClipRectAbs)
sl@0: 	{
sl@0: 	// pre:
sl@0: 	// aDestRectAbs is the user specified dest rect that has been translated to target coord system. It may
sl@0: 	// be larger/outside the target drawing area. We must not modify this rect as it will be used to
sl@0: 	// determine the scaling factor.
sl@0: 	// aSrcRect is the user specified src rect, it is within the image extent.
sl@0: 	// aClipRectAbs is the intersection of current clipping rect and aDestRectAbs and is within the
sl@0: 	// target drawing area.
sl@0: 
sl@0: 	const TUidPixelFormat devFormat = PixelFormatUtil::ConvertToPixelFormat(iDrawDevice->DisplayMode());
sl@0: 	GRAPHICS_ASSERT_DEBUG(devFormat != EUidPixelFormatUnknown, EDirectGdiPanicInvalidDisplayMode);
sl@0: 
sl@0: 	const TUint32* imgAddr = reinterpret_cast<TUint32*>(aImg->DataBuffer());
sl@0: 	const TInt imgStride = aImg->Stride();
sl@0: 	const TSize imgSize = aImg->Size();
sl@0: 	const TUidPixelFormat imgFormat = aImg->PixelFormat();
sl@0: 	const CGraphicsContext::TDrawMode drawMode = GcDrawMode(iDrawMode);
sl@0: 
sl@0: 	// if destination is opaque e.g. RGB_565, XRGB_8888 and the source has alpha, it shall blend
sl@0: 	// (because iDrawMode is set to WritePEN)
sl@0: 	// we treat opaque destination as in pre-multiplied format (with alpha value 1), and read the 
sl@0: 	// source in pre-multiplied format too, to enable optimum blending computation i.e.
sl@0: 	// "src + (1-alpha) * dst"
sl@0: 	const TUidPixelFormat readFormat = !PixelFormatUtil::HasAlpha(devFormat) &&
sl@0: 							iDrawMode == DirectGdi::EDrawModePEN ?
sl@0: 							EUidPixelFormatARGB_8888_PRE : devFormat;
sl@0: 
sl@0: 	TUint32* scanLineBuffer = iDrawDevice->ScanLineBuffer();
sl@0: 	const TInt scanLineBytes = iDrawDevice->ScanLineBytes();
sl@0: 	TPtr8 scanLineDes(reinterpret_cast<TUint8*>(scanLineBuffer), scanLineBytes, scanLineBytes);
sl@0: 
sl@0: 	// setup pixel reader toolkit
sl@0: 	//
sl@0: 	TPixelBufferReader reader(imgAddr, imgSize, imgStride, imgFormat);
sl@0: 	TDrawDeviceWrapper writer(iDrawDevice, GcDrawMode(iDrawMode));
sl@0: 
sl@0: 	if (aRotation == DirectGdi::EGraphicsRotationNone)
sl@0: 		{		
sl@0: 		// Note that there was previously an optimization added here that used MFlastBlend if 
sl@0: 		// available, however it did not work correctly for some cases using DrawResource so has been 
sl@0: 		// removed from this code. (A source drawn with OpenGLES on to a target in XRGB_8888 format
sl@0: 		// actually had alpha in the unused channel which was being drawn by MFastBlend)
sl@0: 		//
sl@0: 		const TInt srcLen = aSrcRect.Width();
sl@0: 		const TInt destLen = aDestRectAbs.Width();
sl@0: 		const TInt clipLen = aClipRectAbs.Width();
sl@0: 		const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
sl@0: 
sl@0: 		// setup DDA for scaling in Y direction based on src rect and dst rect size
sl@0: 		// scaling in X direction will be done by GetScaledScanLine()
sl@0: 		//
sl@0: 		// setup Y scaler and start from top-left of src/dest to bottom-right of src/dest
sl@0: 		
sl@0: 		TLinearDDA yScaler;
sl@0: 		yScaler.Construct(
sl@0: 				TPoint(aSrcRect.iTl.iY, aDestRectAbs.iTl.iY),
sl@0: 				TPoint(aSrcRect.iBr.iY, aDestRectAbs.iBr.iY),
sl@0: 				TLinearDDA::ELeft);
sl@0: 
sl@0: 		// move to position of current clip rect top row as the start of dest Y
sl@0: 		TInt srcY;	
sl@0: 		yScaler.JumpToYCoord2(srcY, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// yPos contains mapping between src Y (TPoint.iX) and dest Y (TPoint.iY)
sl@0: 		TPoint yPos(srcY, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// write to target from top to bottom
sl@0: 		//
sl@0: 		while (yPos.iY < aClipRectAbs.iBr.iY)
sl@0: 			{
sl@0: 			reader.GetScaledScanLine(scanLineDes,
sl@0: 									TPoint(aSrcRect.iTl.iX, yPos.iX),	// src X and Y
sl@0: 									clipPos,							// clipped dest X
sl@0: 									clipLen,
sl@0: 									destLen,
sl@0: 									srcLen,
sl@0: 									readFormat,
sl@0: 									TPixelBufferReader::EReadHorizontal);
sl@0: 			
sl@0: 			// use dest Y here
sl@0: 			writer.WriteLine(aClipRectAbs.iTl.iX, yPos.iY, clipLen, scanLineBuffer, drawMode);
sl@0: 
sl@0: 			// move scaler one position
sl@0: 			yScaler.NextStep(yPos);
sl@0: 			};
sl@0: 		}
sl@0: 	else if (aRotation == DirectGdi::EGraphicsRotation90)
sl@0: 		{
sl@0: 		// we're going to read source vertically from bottom to up, swap relevant bits and pieces
sl@0: 		// dst-width corresponds to src-height
sl@0: 		// dst-height corresponds to src-width
sl@0: 		//
sl@0: 		const TInt srcLen = aSrcRect.Height();
sl@0: 		const TInt destLen = aDestRectAbs.Width();
sl@0: 
sl@0: 		// the following doesn't change, the amount of pixel read (vertically) will be based on
sl@0: 		// the drawing area witdh i.e. clip width
sl@0: 		//
sl@0: 		const TInt clipLen = aClipRectAbs.Width();
sl@0: 
sl@0: 		// offset into read area doesn't change either, it will be translated into some Y position
sl@0: 		// from bottom row of source image
sl@0: 		const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
sl@0: 
sl@0: 		// setup DDA for scaling in src X direction based on src rect and dst rect size
sl@0: 		// scaling in src Y direction will be done by GetScaledScanLine(EReadVerticalReverse)
sl@0: 		//
sl@0: 		// scaler map dest Y to src X because of 90 degre rotation
sl@0: 		// start from  top row dest, left-most column src to bottom row dest, right-most column src
sl@0: 		//
sl@0: 		TLinearDDA xScaler;
sl@0: 		xScaler.Construct(
sl@0: 				TPoint(aSrcRect.iTl.iX, aDestRectAbs.iTl.iY),
sl@0: 				TPoint(aSrcRect.iBr.iX, aDestRectAbs.iBr.iY),
sl@0: 				TLinearDDA::ELeft);
sl@0: 		
sl@0: 		// move to position of current clip rect top row as the start of src X
sl@0: 		TInt srcX;	
sl@0: 		xScaler.JumpToYCoord2(srcX, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// xPos contains mapping between src X (TPoint.iX) and dest Y (TPoint.iY)
sl@0: 		TPoint xPos(srcX, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// write to target from top to bottom
sl@0: 		//
sl@0: 		while (xPos.iY < aClipRectAbs.iBr.iY)
sl@0: 			{
sl@0: 			// read pixel vertically from left column to right
sl@0: 			reader.GetScaledScanLine(scanLineDes,
sl@0: 									TPoint(xPos.iX, aSrcRect.iBr.iY - 1),	// src X, src Y
sl@0: 									clipPos,								// distance from bottom source
sl@0: 									clipLen,
sl@0: 									destLen,
sl@0: 									srcLen,
sl@0: 									readFormat,
sl@0: 									TPixelBufferReader::EReadVerticalReverse);
sl@0: 			
sl@0: 			// use dest Y here
sl@0: 			writer.WriteLine(aClipRectAbs.iTl.iX, xPos.iY, clipLen, scanLineBuffer, drawMode);
sl@0: 
sl@0: 			// move scaler one position
sl@0: 			xScaler.NextStep(xPos);
sl@0: 			}
sl@0: 		}
sl@0: 	else if (aRotation == DirectGdi::EGraphicsRotation180)
sl@0: 		{
sl@0: 		const TInt srcLen = aSrcRect.Width();
sl@0: 		const TInt destLen = aDestRectAbs.Width();
sl@0: 		const TInt clipLen = aClipRectAbs.Width();
sl@0: 
sl@0: 		// clipPos doesn't need to be inverted (using iBr.iX) because the yScaler below
sl@0: 		// will do that for us (by stepping backward)
sl@0: 		//
sl@0: 		const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
sl@0: 
sl@0: 		// setup DDA for scaling in Y direction based on src rect and dst rect size
sl@0: 		// scaling in X direction will be done by GetScaledScanLine()
sl@0: 		//
sl@0: 		// setup Y scaler and start from bottom-right of src/dest to top-left of src/dest
sl@0: 		// to do backward stepping (src Y inversion)
sl@0: 
sl@0: 		TLinearDDA yScaler;
sl@0: 		yScaler.Construct(
sl@0: 				// we starting from 1st pixel from bottom of source image, we need to
sl@0: 				// step back 1 position as bottom-row coord is beyond the last pixel in the source rect
sl@0: 				TPoint(aSrcRect.iBr.iY - 1, aDestRectAbs.iTl.iY),
sl@0: 				TPoint(aSrcRect.iTl.iY - 1, aDestRectAbs.iBr.iY),
sl@0: 				TLinearDDA::ELeft);
sl@0: 
sl@0: 		// move to position of current clip rect top row as the start of dest Y
sl@0: 		// which will calculate inverted src Y distance from bottom of source rectangle
sl@0: 		TInt invSrcY;	
sl@0: 		yScaler.JumpToYCoord2(invSrcY, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// yPos contains mapping between inverted src Y (TPoint.iX) and dest Y (TPoint.iY)
sl@0: 		TPoint yPos(invSrcY, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// write to target from top to bottom
sl@0: 		//
sl@0: 		while (yPos.iY < aClipRectAbs.iBr.iY)
sl@0: 			{
sl@0: 			// read scanline from righ to left i.e. use aSrcRect.iBr.iX-1 (last column)
sl@0: 			// as starting src X value
sl@0: 			reader.GetScaledScanLine(scanLineDes,
sl@0: 									TPoint(aSrcRect.iBr.iX - 1, yPos.iX),	// src X and inverted src Y
sl@0: 									clipPos,								// clipped dest X
sl@0: 									clipLen,
sl@0: 									destLen,
sl@0: 									srcLen,
sl@0: 									readFormat,
sl@0: 									TPixelBufferReader::EReadHorizontalReverse);
sl@0: 			
sl@0: 			// use dest Y here
sl@0: 			writer.WriteLine(aClipRectAbs.iTl.iX, yPos.iY, clipLen, scanLineBuffer, drawMode);
sl@0: 
sl@0: 			// move scaler one position
sl@0: 			yScaler.NextStep(yPos);
sl@0: 			}
sl@0: 		}
sl@0: 	else if(aRotation == DirectGdi::EGraphicsRotation270)
sl@0: 		{
sl@0: 		// we're going to read source vertically from top to bottom, swap relevant bits and pieces
sl@0: 		// dst-width corresponds to src-height
sl@0: 		// dst-height corresponds to src-width
sl@0: 		const TInt srcLen = aSrcRect.Height();
sl@0: 		const TInt destLen = aDestRectAbs.Width();
sl@0: 
sl@0: 		// the following doesn't change, the amount of pixel read (vertically) will be based on
sl@0: 		// the drawing area witdh i.e. clip width
sl@0: 		const TInt clipLen = aClipRectAbs.Width();
sl@0: 
sl@0: 		// offset into read area doesn't change either, it will be translated into some Y position
sl@0: 		// from top row of source image
sl@0: 		const TInt clipPos = aClipRectAbs.iTl.iX - aDestRectAbs.iTl.iX;
sl@0: 
sl@0: 		// setup DDA for scaling in src X direction based on src rect and dst rect size
sl@0: 		// scaling in src Y direction will be done by GetScaledScanLine(EReadVertical)
sl@0: 		//
sl@0: 		// scaler map dest Y to src X because of 270 degre rotation
sl@0: 		// start from top row dest, right-most column src to bottom row dest, left-most column src
sl@0: 
sl@0: 		TLinearDDA xScaler;
sl@0: 		xScaler.Construct(
sl@0: 				// decrement 1 pixel to get into last pixel within source
sl@0: 				TPoint(aSrcRect.iBr.iX - 1, aDestRectAbs.iTl.iY),
sl@0: 				TPoint(aSrcRect.iTl.iX - 1, aDestRectAbs.iBr.iY),
sl@0: 				TLinearDDA::ELeft);
sl@0: 
sl@0: 		// move to position of current clip rect top row as the start of src X
sl@0: 		TInt srcX;	
sl@0: 		xScaler.JumpToYCoord2(srcX, aClipRectAbs.iTl.iY);
sl@0: 		// xPos contains mapping between src X (TPoint.iX) and dest Y (TPoint.iY)
sl@0: 		TPoint xPos(srcX, aClipRectAbs.iTl.iY);
sl@0: 
sl@0: 		// write to target from top to bottom
sl@0: 		//
sl@0: 		while (xPos.iY < aClipRectAbs.iBr.iY)
sl@0: 			{
sl@0: 			// read pixel vertically from left column to right
sl@0: 			reader.GetScaledScanLine(scanLineDes,
sl@0: 									TPoint(xPos.iX, aSrcRect.iTl.iY),		// src X, src Y
sl@0: 									clipPos,								// distance from bottom source
sl@0: 									clipLen,
sl@0: 									destLen,
sl@0: 									srcLen,
sl@0: 									readFormat,
sl@0: 									TPixelBufferReader::EReadVertical);
sl@0: 			
sl@0: 			// use dest Y here
sl@0: 			writer.WriteLine(aClipRectAbs.iTl.iX, xPos.iY, clipLen, scanLineBuffer, drawMode);
sl@0: 
sl@0: 			// move scaler one position
sl@0: 			xScaler.NextStep(xPos);
sl@0: 			}
sl@0: 		}
sl@0: 	}