1.1 --- a/epoc32/include/graphics/blendingalgorithms.inl Wed Mar 31 12:27:01 2010 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,133 +0,0 @@
1.4 -// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
1.5 -// All rights reserved.
1.6 -// This component and the accompanying materials are made available
1.7 -// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members
1.8 -// which accompanies this distribution, and is available
1.9 -// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".
1.10 -//
1.11 -// Initial Contributors:
1.12 -// Nokia Corporation - initial contribution.
1.13 -//
1.14 -// Contributors:
1.15 -//
1.16 -// Description:
1.17 -//
1.18 -
1.19 -const TUint32 KRBMask = 0x00ff00ff;
1.20 -const TUint32 KAGMask = 0xff00ff00;
1.21 -const TUint32 KGMask = 0x0000ff00;
1.22 -
1.23 -//Algoriths for Premultiplied alpha screenmode/pixel format.
1.24 -
1.25 -inline TUint32 PMAPixelBlend(TUint32 aDestPixel, TUint32 aSrcPixel, TUint8 aMask)
1.26 - {
1.27 - if(aMask)
1.28 - {
1.29 - if(aMask == 0xff) // opaque, so unchanged
1.30 - {
1.31 - return aSrcPixel;
1.32 - }
1.33 - else
1.34 - {
1.35 - return PMABlend_noChecks(aDestPixel, aSrcPixel, aMask);
1.36 - }
1.37 - }
1.38 - else // completely transparent
1.39 - {
1.40 - return aDestPixel;
1.41 - }
1.42 - }
1.43 -
1.44 -inline TUint32 PMAPixelBlend(TUint32 aDestPixel, TUint32 aSrcPixel)
1.45 - {
1.46 - TUint8 mask = (TUint8)(aSrcPixel >> 24);
1.47 - return PMAPixelBlend(aDestPixel, aSrcPixel, mask);
1.48 - }
1.49 -
1.50 -inline TUint32 PMABlend_noChecks(TUint32 aDestPixel, TUint32 aSrcPixel, TUint8 aMaskingFactor)
1.51 - {
1.52 - TUint32 src_c = aSrcPixel & KRBMask;
1.53 - TUint32 dst_c = aDestPixel & KRBMask;
1.54 - const TUint32 mask = 0x0100 - aMaskingFactor;
1.55 - dst_c = (src_c + ((mask * dst_c)>>8)) & KRBMask;
1.56 - src_c = (aSrcPixel & KAGMask)>>8;
1.57 - TUint32 dst_ag = (aDestPixel & KAGMask)>>8;
1.58 - dst_c |= ((src_c + ((mask * dst_ag)>>8)) & KRBMask)<<8;
1.59 - return dst_c;
1.60 - }
1.61 -
1.62 -inline void PMABlend_noChecksInplace(TUint32& aDest_io, TUint32& aSrcPixel,TUint8& aMaskingFactor)
1.63 - {
1.64 - TUint32 src_c = aSrcPixel & KRBMask;
1.65 - TUint32 dst_ag = (aDest_io & KAGMask) >> 8;
1.66 - aDest_io = aDest_io & KRBMask;
1.67 - const TUint32 mask = 0x0100 - aMaskingFactor;
1.68 - aDest_io = (src_c + ((mask * aDest_io) >> 8)) & KRBMask;
1.69 - src_c = (aSrcPixel & KAGMask) >> 8;
1.70 - aDest_io |= ((src_c + ((mask * dst_ag) >> 8)) & KRBMask)<<8;
1.71 - }
1.72 -
1.73 -inline void PMAInplaceBlend(TUint32& aDest_io, TUint32& aSrc_in)
1.74 - {
1.75 - TUint8 mask = (TUint8)(aSrc_in >> 24);
1.76 - if(mask)
1.77 - {
1.78 - if(mask == 0xff) // opaque, so dst = src.
1.79 - {
1.80 - aDest_io = aSrc_in;
1.81 - }
1.82 - else
1.83 - {
1.84 - PMABlend_noChecksInplace(aDest_io, aSrc_in, mask);
1.85 - }
1.86 - }
1.87 - //else src completely transparent, so dst unchanged.
1.88 - }
1.89 -
1.90 -inline TUint32 NonPMA2PMAPixel(TUint32 aPixel)
1.91 - {
1.92 - TUint8 tA = (TUint8)(aPixel >> 24);
1.93 - if (tA==0)
1.94 - {
1.95 - return 0;
1.96 - }
1.97 - if (tA==0xff)
1.98 - {
1.99 - return aPixel;
1.100 - }
1.101 -
1.102 - // Use a bias value of 128 rather than 255, but also add 1/256 of the numerator
1.103 - // before dividing the sum by 256.
1.104 -
1.105 - TUint32 tap1=tA+1;
1.106 - TUint32 scaledRB = (aPixel & KRBMask) * tap1;
1.107 - TUint32 scaledG = (aPixel & KGMask ) * tap1;
1.108 - return (aPixel & 0xff000000) | ((scaledRB>>8) & KRBMask) | ((scaledG>>8)& KGMask);
1.109 - }
1.110 -
1.111 -inline TUint32 PMA2NonPMAPixel(TUint32 aPixel, const TUint16* aNormTable)
1.112 - {
1.113 - TUint8 alpha = (TUint8)(aPixel >> 24);
1.114 - if (alpha==0)
1.115 - {
1.116 - return 0;
1.117 - }
1.118 - if (alpha==0xff)
1.119 - {
1.120 - return aPixel;
1.121 - }
1.122 - TUint16 norm = aNormTable[alpha];
1.123 - TUint32 norm_rb = (((aPixel & KRBMask) * norm) >> 8) & KRBMask;
1.124 - TUint32 norm_g = (((aPixel & KGMask ) * norm) >> 8) & KGMask;
1.125 - return ((aPixel & 0xff000000) | norm_rb | norm_g);
1.126 - }
1.127 -
1.128 -inline void Convert2PMA(TUint32& aInOutValue)
1.129 - {
1.130 - aInOutValue = NonPMA2PMAPixel(aInOutValue);
1.131 - }
1.132 -
1.133 -inline void Convert2NonPMA(TUint32& aInOutValue, const TUint16* aNormTable)
1.134 - {
1.135 - aInOutValue = PMA2NonPMAPixel(aInOutValue, aNormTable);
1.136 - }