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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the QtGui module of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "qimage.h"

    43 #include <private/qimage_p.h>

    44 #include <private/qsimd_p.h>

    45 #include <private/qdrawhelper_p.h>

    46 #include <private/qdrawingprimitive_sse2_p.h>

    47 

    48 #ifdef QT_HAVE_SSE2

    49 

    50 QT_BEGIN_NAMESPACE

    51 

    52 bool convert_ARGB_to_ARGB_PM_inplace_sse2(QImageData *data, Qt::ImageConversionFlags)

    53 {

    54     Q_ASSERT(data->format == QImage::Format_ARGB32);

    55 

    56     // extra pixels on each line

    57     const int spare = data->width & 3;

    58     // width in pixels of the pad at the end of each line

    59     const int pad = (data->bytes_per_line >> 2) - data->width;

    60     const int iter = data->width >> 2;

    61     int height = data->height;

    62 

    63     const __m128i alphaMask = _mm_set1_epi32(0xff000000);

    64     const __m128i nullVector = _mm_setzero_si128();

    65     const __m128i half = _mm_set1_epi16(0x80);

    66     const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);

    67 

    68     __m128i *d = reinterpret_cast<__m128i*>(data->data);

    69     while (height--) {

    70         const __m128i *end = d + iter;

    71 

    72         for (; d != end; ++d) {

    73             const __m128i srcVector = _mm_loadu_si128(d);

    74             const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask);

    75             if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) {

    76                 // opaque, data is unchanged

    77             } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) == 0xffff) {

    78                 // fully transparent

    79                 _mm_storeu_si128(d, nullVector);

    80             } else {

    81                 __m128i alphaChannel = _mm_srli_epi32(srcVector, 24);

    82                 alphaChannel = _mm_or_si128(alphaChannel, _mm_slli_epi32(alphaChannel, 16));

    83 

    84                 __m128i result;

    85                 BYTE_MUL_SSE2(result, srcVector, alphaChannel, colorMask, half);

    86                 result = _mm_or_si128(_mm_andnot_si128(alphaMask, result), srcVectorAlpha);

    87                 _mm_storeu_si128(d, result);

    88             }

    89         }

    90 

    91         QRgb *p = reinterpret_cast<QRgb*>(d);

    92         QRgb *pe = p+spare;

    93         for (; p != pe; ++p) {

    94             if (*p < 0x00ffffff)

    95                 *p = 0;

    96             else if (*p < 0xff000000)

    97                 *p = PREMUL(*p);

    98         }

    99 

   100         d = reinterpret_cast<__m128i*>(p+pad);

   101     }

   102 

   103     data->format = QImage::Format_ARGB32_Premultiplied;

   104     return true;

   105 }

   106 

   107 QT_END_NAMESPACE

   108 

   109 #endif // QT_HAVE_SSE2