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1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include <e32base.h> |
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17 |
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18 #include "JpegTypes.h" |
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19 |
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20 #if defined(__ARMCC__) |
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21 // use ARM instruction for performance-critical code |
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22 #pragma push |
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23 #pragma arm |
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24 #pragma O3 |
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25 #pragma Otime |
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26 #endif |
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27 |
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28 TRgb TYCbCr::YCbCrtoRGB(TInt aY,TInt aCb,TInt aCr) |
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29 { |
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30 aCb -= 128; |
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31 aCr -= 128; |
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32 |
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33 register TInt red = aY + ((KRedCrFactor * aCr) >> 16); |
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34 register TInt green = aY - ((KGreenCbFactor * aCb + KGreenCrFactor * aCr) >> 16); |
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35 register TInt blue = aY + ((KBlueCbFactor * aCb) >> 16); |
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36 |
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37 return TRgb(ClipColorComponent(red), |
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38 ClipColorComponent(green), |
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39 ClipColorComponent(blue) |
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40 ); |
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41 } |
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42 /** |
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43 Clamp and shift blue component for composing Color64K later |
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44 */ |
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45 FORCEDINLINE TUint ClampBlue64K(TInt aValue) |
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46 { |
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47 return (aValue < 0) ? 0 : (aValue > 255) ? (255>>3) : (aValue>>3); |
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48 } |
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49 |
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50 /** |
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51 Clamp and shift green component for composing Color64K later |
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52 */ |
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53 FORCEDINLINE TUint ClampGreen64K(TInt aValue) |
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54 { |
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55 return (aValue < 0) ? 0 : (aValue > 255) ? (0xFC<<3) : ((aValue & 0xFC)<<3); |
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56 } |
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57 |
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58 /** |
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59 Clamp and shift red component for composing Color64K later |
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60 */ |
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61 FORCEDINLINE TUint ClampRed64K(TInt aValue) |
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62 { |
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63 return (aValue < 0) ? 0 : (aValue > 255) ? (0xF8<<8) : ((aValue & 0xF8)<<8); |
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64 } |
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65 |
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66 /*static*/ |
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67 void TYCbCr::YCbCrtoRaw64K(TInt aY,TInt aCb,TInt aCr, TRgb* aPtr) |
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68 { |
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69 aCb -= 128; |
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70 aCr -= 128; |
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71 |
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72 (reinterpret_cast<TUint16*>(aPtr))[0]= |
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73 ClampBlue64K(aY + ((KBlueCbFactor * aCb) >> 16) ) |
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74 | ClampGreen64K(aY - ((KGreenCbFactor * aCb + KGreenCrFactor * aCr) >> 16)) |
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75 | ClampRed64K( aY + ((KRedCrFactor * aCr) >> 16) ); |
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76 } |
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77 |
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78 |
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79 void TYCbCr::YCbCrtoRawRGB(TInt aY,TInt aCb,TInt aCr, TRgb* aPtr) |
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80 { |
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81 TYCbCr::YCbCrtoRawRGBInl(aY, aCb, aCr, aPtr); |
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82 } |
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83 |
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84 /** |
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85 Calculate Y comp for every pixel and U,V as an average for 2 pixels |
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86 (Accumulate an average in RGB then go to the YUV colour space) |
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87 Scaled fixed point math is used i.e. everything which is more than 1.0 is shifted by 16 bits |
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88 y = 0.299 * R + 0.587G + 0.114 * B |
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89 cr = 0.5 * R - 0.419G - 0.081 * B |
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90 cb = 0.5 * B -0.169 * R - 0.331 * G |
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91 */ |
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92 void TYCbCr::RGBtoYCbCr2PixUVSum(TDataUnit::TDataUnitElemType* aYPtr,TDataUnit::TDataUnitElemType* aCbPtr, |
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93 CRgbBufferPtr::TConstRgbBufferPtr aRgbBuffer) |
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94 { |
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95 |
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96 TInt red = CRgbBufferPtr::Red(aRgbBuffer); |
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97 TInt green = CRgbBufferPtr::Green(aRgbBuffer); |
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98 TInt blue = CRgbBufferPtr::Blue(aRgbBuffer); |
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99 |
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100 aYPtr[0]= TInt16( TUint( (KYRedFactor * red) + (KYGreenFactor * green) + (KYBlueFactor * blue) ) >> 16 ); |
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101 |
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102 aRgbBuffer = CRgbBufferPtr::ShiftPtr(aRgbBuffer,1); |
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103 |
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104 red += CRgbBufferPtr::Red(aRgbBuffer); |
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105 green += CRgbBufferPtr::Green(aRgbBuffer); |
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106 blue += CRgbBufferPtr::Blue(aRgbBuffer); |
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107 |
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108 // blue * 0.5 de-scale and div by 2 |
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109 aCbPtr[0] = 128 + TInt16( ((blue << 15) - (KCbRedFactor * red) - (KCbGreenFactor * green) ) >> 17); |
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110 // red * 0.5 de-scale and div by 2 |
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111 aCbPtr[KJpgDCTBlockSize]= 128 + TInt16( ((red << 15) - (KCrGreenFactor * green) - (KCrBlueFactor * blue)) >> 17); |
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112 |
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113 red = CRgbBufferPtr::Red(aRgbBuffer); |
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114 green = CRgbBufferPtr::Green(aRgbBuffer); |
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115 blue = CRgbBufferPtr::Blue(aRgbBuffer); |
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116 |
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117 aYPtr[1]= TInt16( TUint( (KYRedFactor * red) + (KYGreenFactor * green) + (KYBlueFactor * blue) ) >> 16 ); |
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118 |
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119 } |
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120 |
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121 /** |
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122 Calculate Y comp for every pixel and U,V as an average for 4 pixels square |
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123 (Accumulate an average in RGB then go to the YUV colour space) |
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124 using aLineStride for going to the next line |
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125 This function effectively combines two calls to RGBtoYCbCr2PixUVSum and provides with some speed |
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126 improvement due to better use of local vars rather than 2 calls to the RGBtoYCbCr2PixUVSum() |
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127 See also RGBtoYCbCr2PixUVSum() |
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128 */ |
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129 void TYCbCr::RGBtoYCbCr4PixUVSum(TDataUnit::TDataUnitElemType* aYPtr, TDataUnit::TDataUnitElemType* aCb, |
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130 CRgbBufferPtr::TConstRgbBufferPtr aRgbBuffer, TInt aLineStride) |
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131 { |
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132 const TInt KYNextLineIdx = 8; |
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133 TInt redS = CRgbBufferPtr::Red(aRgbBuffer); |
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134 TInt greenS = CRgbBufferPtr::Green(aRgbBuffer); |
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135 TInt blueS = CRgbBufferPtr::Blue(aRgbBuffer); |
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136 |
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137 aYPtr[0]= TInt16( TUint( (KYRedFactor * redS) + (KYGreenFactor * greenS) + (KYBlueFactor * blueS) ) >> 16 ); |
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138 |
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139 aRgbBuffer = CRgbBufferPtr::ShiftPtr(aRgbBuffer, 1); |
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140 |
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141 TInt red = CRgbBufferPtr::Red(aRgbBuffer); |
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142 TInt green = CRgbBufferPtr::Green(aRgbBuffer); |
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143 TInt blue = CRgbBufferPtr::Blue(aRgbBuffer); |
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144 |
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145 redS += red; |
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146 greenS += green; |
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147 blueS += blue; |
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148 |
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149 aYPtr[1]= TInt16( TUint( (KYRedFactor * red) + (KYGreenFactor * green) + (KYBlueFactor * blue) ) >> 16 ); |
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150 |
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151 aRgbBuffer = CRgbBufferPtr::ShiftPtr(aRgbBuffer, -1); |
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152 aRgbBuffer += aLineStride; |
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153 |
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154 redS += (red = CRgbBufferPtr::Red(aRgbBuffer)); |
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155 greenS += (green = CRgbBufferPtr::Green(aRgbBuffer)); |
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156 blueS += (blue = CRgbBufferPtr::Blue(aRgbBuffer)); |
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157 |
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158 aYPtr[KYNextLineIdx]= TInt16( TUint( (KYRedFactor * red) + (KYGreenFactor * green) + (KYBlueFactor * blue) ) >> 16 ); |
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159 |
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160 aRgbBuffer = CRgbBufferPtr::ShiftPtr(aRgbBuffer, 1); |
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161 |
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162 redS += (red = CRgbBufferPtr::Red(aRgbBuffer)); |
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163 greenS += (green = CRgbBufferPtr::Green(aRgbBuffer)); |
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164 blueS += (blue = CRgbBufferPtr::Blue(aRgbBuffer)); |
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165 |
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166 aYPtr[KYNextLineIdx+1]= TInt16( TUint( (KYRedFactor * red) + (KYGreenFactor * green) + (KYBlueFactor * blue) ) >> 16 ); |
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167 // blue * 0.5 de-scale and div by 4 |
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168 aCb[0]= 128 + TInt16( ((blueS << 15) - (KCbRedFactor * redS) - (KCbGreenFactor * greenS) ) >> 18); |
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169 // red * 0.5 de-scale and div by 4 |
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170 aCb[KJpgDCTBlockSize]= 128 + TInt16( ((redS << 15) - (KCrGreenFactor * greenS) - (KCrBlueFactor * blueS)) >> 18); |
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171 } |
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172 |
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173 #if defined(__ARMCC__) |
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174 #pragma pop |
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175 #endif |