src/gui/painting/qdrawingprimitive_sse2_p.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 18 Aug 2010 10:37:55 +0300
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QDRAWINGPRIMITIVE_SSE2_P_H
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#define QDRAWINGPRIMITIVE_SSE2_P_H
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#include <private/qsimd_p.h>
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#ifdef QT_HAVE_SSE2
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//
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//  W A R N I N G
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//  -------------
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//
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// This file is not part of the Qt API.  It exists purely as an
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// implementation detail.  This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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QT_BEGIN_NAMESPACE
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/*
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 * Multiply the components of pixelVector by alphaChannel
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 * Each 32bits components of alphaChannel must be in the form 0x00AA00AA
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 * colorMask must have 0x00ff00ff on each 32 bits component
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 * half must have the value 128 (0x80) for each 32 bits compnent
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 */
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#define BYTE_MUL_SSE2(result, pixelVector, alphaChannel, colorMask, half) \
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{ \
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    /* 1. separate the colors in 2 vectors so each color is on 16 bits \
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       (in order to be multiplied by the alpha \
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       each 32 bit of dstVectorAG are in the form 0x00AA00GG \
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       each 32 bit of dstVectorRB are in the form 0x00RR00BB */\
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    __m128i pixelVectorAG = _mm_srli_epi16(pixelVector, 8); \
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    __m128i pixelVectorRB = _mm_and_si128(pixelVector, colorMask); \
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 \
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    /* 2. multiply the vectors by the alpha channel */\
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    pixelVectorAG = _mm_mullo_epi16(pixelVectorAG, alphaChannel); \
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    pixelVectorRB = _mm_mullo_epi16(pixelVectorRB, alphaChannel); \
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 \
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    /* 3. devide by 255, that's the tricky part. \
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       we do it like for BYTE_MUL(), with bit shift: X/255 ~= (X + X/256 + rounding)/256 */ \
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    /** so first (X + X/256 + rounding) */\
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    pixelVectorRB = _mm_add_epi16(pixelVectorRB, _mm_srli_epi16(pixelVectorRB, 8)); \
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    pixelVectorRB = _mm_add_epi16(pixelVectorRB, half); \
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    pixelVectorAG = _mm_add_epi16(pixelVectorAG, _mm_srli_epi16(pixelVectorAG, 8)); \
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    pixelVectorAG = _mm_add_epi16(pixelVectorAG, half); \
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 \
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    /** second devide by 256 */\
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    pixelVectorRB = _mm_srli_epi16(pixelVectorRB, 8); \
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    /** for AG, we could >> 8 to divide followed by << 8 to put the \
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        bytes in the correct position. By masking instead, we execute \
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        only one instruction */\
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    pixelVectorAG = _mm_andnot_si128(colorMask, pixelVectorAG); \
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 \
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    /* 4. combine the 2 pairs of colors */ \
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    result = _mm_or_si128(pixelVectorAG, pixelVectorRB); \
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}
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/*
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 * Each 32bits components of alphaChannel must be in the form 0x00AA00AA
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 * oneMinusAlphaChannel must be 255 - alpha for each 32 bits component
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 * colorMask must have 0x00ff00ff on each 32 bits component
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 * half must have the value 128 (0x80) for each 32 bits compnent
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 */
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#define INTERPOLATE_PIXEL_255_SSE2(result, srcVector, dstVector, alphaChannel, oneMinusAlphaChannel, colorMask, half) { \
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    /* interpolate AG */\
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    __m128i srcVectorAG = _mm_srli_epi16(srcVector, 8); \
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    __m128i dstVectorAG = _mm_srli_epi16(dstVector, 8); \
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    __m128i srcVectorAGalpha = _mm_mullo_epi16(srcVectorAG, alphaChannel); \
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   111
    __m128i dstVectorAGoneMinusAlphalpha = _mm_mullo_epi16(dstVectorAG, oneMinusAlphaChannel); \
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    __m128i finalAG = _mm_add_epi16(srcVectorAGalpha, dstVectorAGoneMinusAlphalpha); \
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    finalAG = _mm_add_epi16(finalAG, _mm_srli_epi16(finalAG, 8)); \
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    finalAG = _mm_add_epi16(finalAG, half); \
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    finalAG = _mm_andnot_si128(colorMask, finalAG); \
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 \
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    /* interpolate RB */\
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    __m128i srcVectorRB = _mm_and_si128(srcVector, colorMask); \
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    __m128i dstVectorRB = _mm_and_si128(dstVector, colorMask); \
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    __m128i srcVectorRBalpha = _mm_mullo_epi16(srcVectorRB, alphaChannel); \
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    __m128i dstVectorRBoneMinusAlphalpha = _mm_mullo_epi16(dstVectorRB, oneMinusAlphaChannel); \
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    __m128i finalRB = _mm_add_epi16(srcVectorRBalpha, dstVectorRBoneMinusAlphalpha); \
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    finalRB = _mm_add_epi16(finalRB, _mm_srli_epi16(finalRB, 8)); \
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    finalRB = _mm_add_epi16(finalRB, half); \
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    finalRB = _mm_srli_epi16(finalRB, 8); \
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 \
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    /* combine */\
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    result = _mm_or_si128(finalAG, finalRB); \
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}
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   130
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// Basically blend src over dst with the const alpha defined as constAlphaVector.
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// nullVector, half, one, colorMask are constant accross the whole image/texture, and should be defined as:
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//const __m128i nullVector = _mm_set1_epi32(0);
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//const __m128i half = _mm_set1_epi16(0x80);
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//const __m128i one = _mm_set1_epi16(0xff);
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//const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
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//const __m128i alphaMask = _mm_set1_epi32(0xff000000);
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//
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// The computation being done is:
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// result = s + d * (1-alpha)
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// with shortcuts if fully opaque or fully transparent.
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#define BLEND_SOURCE_OVER_ARGB32_SSE2(dst, src, length, nullVector, half, one, colorMask, alphaMask) { \
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    int x = 0; \
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\
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    /* First, get dst aligned. */ \
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    const int offsetToAlignOn16Bytes = (4 - ((reinterpret_cast<quintptr>(dst) >> 2) & 0x3)) & 0x3;\
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    const int prologLength = qMin(length, offsetToAlignOn16Bytes);\
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    for (; x < prologLength; ++x) { \
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        uint s = src[x]; \
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        if (s >= 0xff000000) \
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            dst[x] = s; \
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        else if (s != 0) \
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            dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s)); \
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    } \
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\
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    for (; x < length-3; x += 4) { \
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        const __m128i srcVector = _mm_loadu_si128((__m128i *)&src[x]); \
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        const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask); \
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   159
        if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) { \
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            /* all opaque */ \
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            _mm_store_si128((__m128i *)&dst[x], srcVector); \
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        } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) { \
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            /* not fully transparent */ \
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            /* extract the alpha channel on 2 x 16 bits */ \
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            /* so we have room for the multiplication */ \
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            /* each 32 bits will be in the form 0x00AA00AA */ \
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            /* with A being the 1 - alpha */ \
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            __m128i alphaChannel = _mm_srli_epi32(srcVector, 24); \
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            alphaChannel = _mm_or_si128(alphaChannel, _mm_slli_epi32(alphaChannel, 16)); \
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            alphaChannel = _mm_sub_epi16(one, alphaChannel); \
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 \
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            const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \
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            __m128i destMultipliedByOneMinusAlpha; \
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            BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \
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 \
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            /* result = s + d * (1-alpha) */\
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            const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \
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            _mm_store_si128((__m128i *)&dst[x], result); \
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        } \
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    } \
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    for (; x < length; ++x) { \
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        uint s = src[x]; \
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        if (s >= 0xff000000) \
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            dst[x] = s; \
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        else if (s != 0) \
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            dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s)); \
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    } \
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}
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// Basically blend src over dst with the const alpha defined as constAlphaVector.
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// nullVector, half, one, colorMask are constant accross the whole image/texture, and should be defined as:
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//const __m128i nullVector = _mm_set1_epi32(0);
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//const __m128i half = _mm_set1_epi16(0x80);
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//const __m128i one = _mm_set1_epi16(0xff);
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//const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
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//
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// The computation being done is:
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// dest = (s + d * sia) * ca + d * cia
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//      = s * ca + d * (sia * ca + cia)
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//      = s * ca + d * (1 - sa*ca)
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#define BLEND_SOURCE_OVER_ARGB32_WITH_CONST_ALPHA_SSE2(dst, src, length, nullVector, half, one, colorMask, constAlphaVector) \
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{ \
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    int x = 0; \
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\
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    const int offsetToAlignOn16Bytes = (4 - ((reinterpret_cast<quintptr>(dst) >> 2) & 0x3)) & 0x3;\
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    const int prologLength = qMin(length, offsetToAlignOn16Bytes);\
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    for (; x < prologLength; ++x) { \
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        quint32 s = src[x]; \
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        if (s != 0) { \
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            s = BYTE_MUL(s, const_alpha); \
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            dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s)); \
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        } \
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    } \
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\
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    for (; x < length-3; x += 4) { \
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        __m128i srcVector = _mm_loadu_si128((__m128i *)&src[x]); \
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        if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVector, nullVector)) != 0xffff) { \
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            BYTE_MUL_SSE2(srcVector, srcVector, constAlphaVector, colorMask, half); \
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\
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            __m128i alphaChannel = _mm_srli_epi32(srcVector, 24); \
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            alphaChannel = _mm_or_si128(alphaChannel, _mm_slli_epi32(alphaChannel, 16)); \
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            alphaChannel = _mm_sub_epi16(one, alphaChannel); \
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 \
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            const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \
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            __m128i destMultipliedByOneMinusAlpha; \
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            BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \
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 \
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            const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \
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            _mm_store_si128((__m128i *)&dst[x], result); \
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        } \
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    } \
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    for (; x < length; ++x) { \
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        quint32 s = src[x]; \
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        if (s != 0) { \
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            s = BYTE_MUL(s, const_alpha); \
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            dst[x] = s + BYTE_MUL(dst[x], qAlpha(~s)); \
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        } \
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    } \
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}
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QT_END_NAMESPACE
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#endif // QT_HAVE_SSE2
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#endif // QDRAWINGPRIMITIVE_SSE2_P_H