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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtGui module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <qimage.h> |
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43 #include <private/qimage_p.h> |
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44 #include <private/qsimd_p.h> |
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45 |
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46 #ifdef QT_HAVE_SSSE3 |
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47 |
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48 QT_BEGIN_NAMESPACE |
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49 |
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50 // Convert a scanline of RGB888 (src) to RGB32 (dst) |
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51 // src must be at least len * 3 bytes |
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52 // dst must be at least len * 4 bytes |
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53 Q_GUI_EXPORT void QT_FASTCALL qt_convert_rgb888_to_rgb32_ssse3(quint32 *dst, const uchar *src, int len) |
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54 { |
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55 quint32 *const end = dst + len; |
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56 |
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57 // Prologue, align dst to 16 bytes. The alignement is done on dst because it has 4 store() |
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58 // for each 3 load() of src. |
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59 const int offsetToAlignOn16Bytes = (4 - ((reinterpret_cast<quintptr>(dst) >> 2) & 0x3)) & 0x3; |
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60 const int prologLength = qMin(len, offsetToAlignOn16Bytes); |
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61 |
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62 for (int i = 0; i < prologLength; ++i) { |
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63 *dst++ = qRgb(src[0], src[1], src[2]); |
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64 src += 3; |
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65 } |
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66 |
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67 // Mask the 4 first colors of the RGB888 vector |
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68 const __m128i shuffleMask = _mm_set_epi8(0xff, 9, 10, 11, 0xff, 6, 7, 8, 0xff, 3, 4, 5, 0xff, 0, 1, 2); |
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69 |
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70 // Mask the 4 last colors of a RGB888 vector with an offset of 1 (so the last 3 bytes are RGB) |
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71 const __m128i shuffleMaskEnd = _mm_set_epi8(0xff, 13, 14, 15, 0xff, 10, 11, 12, 0xff, 7, 8, 9, 0xff, 4, 5, 6); |
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72 |
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73 // Mask to have alpha = 0xff |
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74 const __m128i alphaMask = _mm_set1_epi32(0xff000000); |
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75 |
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76 __m128i *inVectorPtr = (__m128i *)src; |
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77 __m128i *dstVectorPtr = (__m128i *)dst; |
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78 |
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79 const int simdRoundCount = (len - prologLength) / 16; // one iteration in the loop converts 16 pixels |
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80 for (int i = 0; i < simdRoundCount; ++i) { |
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81 /* |
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82 RGB888 has 5 pixels per vector, + 1 byte from the next pixel. The idea here is |
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83 to load vectors of RGB888 and use palignr to select a vector out of two vectors. |
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84 |
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85 After 3 loads of RGB888 and 3 stores of RGB32, we have 4 pixels left in the last |
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86 vector of RGB888, we can mask it directly to get a last store or RGB32. After that, |
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87 the first next byte is a R, and we can loop for the next 16 pixels. |
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88 |
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89 The conversion itself is done with a byte permutation (pshufb). |
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90 */ |
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91 __m128i firstSrcVector = _mm_lddqu_si128(inVectorPtr); |
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92 __m128i outputVector = _mm_shuffle_epi8(firstSrcVector, shuffleMask); |
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93 _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask)); |
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94 ++inVectorPtr; |
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95 ++dstVectorPtr; |
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96 |
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97 // There are 4 unused bytes left in srcVector, we need to load the next 16 bytes |
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98 // and load the next input with palignr |
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99 __m128i secondSrcVector = _mm_lddqu_si128(inVectorPtr); |
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100 __m128i srcVector = _mm_alignr_epi8(secondSrcVector, firstSrcVector, 12); |
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101 outputVector = _mm_shuffle_epi8(srcVector, shuffleMask); |
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102 _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask)); |
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103 ++inVectorPtr; |
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104 ++dstVectorPtr; |
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105 firstSrcVector = secondSrcVector; |
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106 |
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107 // We now have 8 unused bytes left in firstSrcVector |
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108 secondSrcVector = _mm_lddqu_si128(inVectorPtr); |
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109 srcVector = _mm_alignr_epi8(secondSrcVector, firstSrcVector, 8); |
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110 outputVector = _mm_shuffle_epi8(srcVector, shuffleMask); |
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111 _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask)); |
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112 ++inVectorPtr; |
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113 ++dstVectorPtr; |
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114 |
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115 // There are now 12 unused bytes in firstSrcVector. |
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116 // We can mask them directly, almost there. |
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117 outputVector = _mm_shuffle_epi8(secondSrcVector, shuffleMaskEnd); |
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118 _mm_store_si128(dstVectorPtr, _mm_or_si128(outputVector, alphaMask)); |
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119 ++dstVectorPtr; |
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120 } |
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121 src = (uchar *)inVectorPtr; |
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122 dst = (quint32 *)dstVectorPtr; |
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123 |
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124 while (dst != end) { |
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125 *dst++ = qRgb(src[0], src[1], src[2]); |
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126 src += 3; |
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127 } |
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128 } |
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129 |
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130 void convert_RGB888_to_RGB32_ssse3(QImageData *dest, const QImageData *src, Qt::ImageConversionFlags) |
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131 { |
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132 Q_ASSERT(src->format == QImage::Format_RGB888); |
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133 Q_ASSERT(dest->format == QImage::Format_RGB32 || dest->format == QImage::Format_ARGB32 || dest->format == QImage::Format_ARGB32_Premultiplied); |
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134 Q_ASSERT(src->width == dest->width); |
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135 Q_ASSERT(src->height == dest->height); |
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136 |
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137 const uchar *src_data = (uchar *) src->data; |
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138 quint32 *dest_data = (quint32 *) dest->data; |
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139 |
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140 for (int i = 0; i < src->height; ++i) { |
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141 qt_convert_rgb888_to_rgb32_ssse3(dest_data, src_data, src->width); |
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142 src_data += src->bytes_per_line; |
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143 dest_data = (quint32 *)((uchar*)dest_data + dest->bytes_per_line); |
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144 } |
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145 } |
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146 |
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147 QT_END_NAMESPACE |
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148 |
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149 #endif // QT_HAVE_SSSE3 |