graphicsdeviceinterface/gdi/inc/blendingalgorithms.inl
author Faisal Memon <faisal.memon@nokia.com>
Fri, 14 May 2010 15:41:33 +0100 (2010-05-14)
branchNewGraphicsArchitecture
changeset 64 5c983aa672ea
parent 0 5d03bc08d59c
permissions -rw-r--r--
Merge 1. Pull in cpp files in the performance enhanced Khronos RI OVG files which are newly added. I've ignored platform-specific cpp files for linux, macosx, and null operating systems because this local solution has its own platform glue (i.e. facility to target Bitmaps but no full windowing support). I've ignored sfEGLInterface.cpp because this is used as a bridge to go from EGL to Nokia's Platsim which offers an EGL service. That's not relevant to this implementation because this is ARM side code, not Intel side. I just left a comment to sfEGLInterface.cpp in case we need to pick up this later on. The current code compiles on winscw. Prior to this fix, the code works on winscw, and can launch the SVG tiger (tiger.exe). That takes about 20 seconds to render. I hope to always be able to show this icon on each commit, and the plan is for the render time to reduce with this series of submissions. On this commit, the tiger renders ok in 20 seconds.
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// Copyright (c) 2007-2009 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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//
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const TUint32 KRBMask = 0x00ff00ff;
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const TUint32 KAGMask = 0xff00ff00;
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const TUint32 KGMask  = 0x0000ff00;
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//Algoriths for Premultiplied alpha screenmode/pixel format.
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inline TUint32 PMAPixelBlend(TUint32 aDestPixel, TUint32 aSrcPixel, TUint8 aMask)
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	{
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	if(aMask)
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		{
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		if(aMask == 0xff) // opaque, so unchanged
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			{
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			return aSrcPixel;
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			}
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		else
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			{
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			return PMABlend_noChecks(aDestPixel, aSrcPixel, aMask);
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			}
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		}
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	 else // completely transparent
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		{
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		return aDestPixel;
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 		}
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	}
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inline TUint32 PMAPixelBlend(TUint32 aDestPixel, TUint32 aSrcPixel)
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	{
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	TUint8 mask = (TUint8)(aSrcPixel >> 24);
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	return PMAPixelBlend(aDestPixel, aSrcPixel, mask);
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	}
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inline TUint32 PMABlend_noChecks(TUint32 aDestPixel, TUint32 aSrcPixel, TUint8 aMaskingFactor)
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	{
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	TUint32 src_c = aSrcPixel & KRBMask;
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	TUint32 dst_c = aDestPixel  & KRBMask;
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	const TUint32 mask = 0x0100 - aMaskingFactor;
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	dst_c = (src_c +  ((mask * dst_c)>>8)) & KRBMask;
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	src_c = (aSrcPixel & KAGMask)>>8;
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	TUint32 dst_ag = (aDestPixel & KAGMask)>>8;
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	dst_c |= ((src_c +  ((mask * dst_ag)>>8)) & KRBMask)<<8;
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	return dst_c;
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	}
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inline void PMABlend_noChecksInplace(TUint32& aDest_io, const TUint32& aSrcPixel, TUint8 aMaskingFactor)
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	{
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	TUint32 src_c = aSrcPixel & KRBMask;
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	TUint32 dst_ag = (aDest_io & KAGMask) >> 8;
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	aDest_io = aDest_io  & KRBMask;
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	const TUint32 mask = 0x0100 - aMaskingFactor;
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	aDest_io = (src_c +  ((mask * aDest_io) >> 8)) & KRBMask;
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	src_c = (aSrcPixel & KAGMask) >> 8;
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	aDest_io |= ((src_c +  ((mask * dst_ag) >> 8)) & KRBMask)<<8;
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	}
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inline void PMAInplaceBlend(TUint32& aDest_io, TUint32& aSrc_in)
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	{
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	TUint8 mask = (TUint8)(aSrc_in >> 24);
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	if(mask)
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		{
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		if(mask == 0xff) // opaque, so dst = src.
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			{
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			aDest_io = aSrc_in;
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			}
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		else
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			{
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			PMABlend_noChecksInplace(aDest_io, aSrc_in, mask);
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			}
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		}
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	//else src completely transparent, so dst unchanged.
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	}
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inline TUint32 NonPMA2PMAPixel(TUint32 aPixel)
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	{
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	TUint8 tA = (TUint8)(aPixel >> 24);
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	if (tA==0)
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		{ 
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		return 0;
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		}
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	if (tA==0xff) 
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		{
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		return aPixel;
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		}
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	// Use a bias value of 128 rather than 255, but also add 1/256 of the numerator 
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	// before dividing the sum by 256.
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	TUint32 tap1=tA+1;
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	TUint32 scaledRB = (aPixel & KRBMask) * tap1;
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	TUint32 scaledG = (aPixel & KGMask ) * tap1;
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	return (aPixel & 0xff000000) | ((scaledRB>>8) & KRBMask) | ((scaledG>>8)& KGMask);
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	}
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   107
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inline TUint32 PMA2NonPMAPixel(TUint32 aPixel, const TUint16* aNormTable)
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	{
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	TUint8 alpha = (TUint8)(aPixel >> 24);
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	if (alpha==0)
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		{ 
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		return 0;
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		}
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	if (alpha==0xff) 
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		{
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		return aPixel;
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		}
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	TUint16 norm = aNormTable[alpha];
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	TUint32 norm_rb = (((aPixel & KRBMask) * norm) >> 8) & KRBMask;
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	TUint32 norm_g =  (((aPixel & KGMask ) * norm) >> 8) & KGMask;
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	return ((aPixel & 0xff000000) | norm_rb | norm_g);
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	}
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inline void Convert2PMA(TUint32& aInOutValue)
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	{
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	aInOutValue = NonPMA2PMAPixel(aInOutValue);
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	}
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inline void Convert2NonPMA(TUint32& aInOutValue, const TUint16* aNormTable)
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	{
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	aInOutValue = PMA2NonPMAPixel(aInOutValue, aNormTable);
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	}