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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 // TDCT::Transform() is based heavily on jpeg_fdct_islow() from jfdctint.c |
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17 // in the IJG code, Copyright (C) 1991-1998, Thomas G. Lane. |
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18 // TDCT::InverseTransform() is based heavily on jpeg_idct_islow() from jidctint.c |
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19 // in the IJG code, Copyright (C) 1991-1998, Thomas G. Lane. |
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20 |
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21 #include <e32base.h> |
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22 |
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23 #include "JpegTypes.h" |
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24 |
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25 // Constants. |
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26 const TInt CONST_BITS = 13; |
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27 const TInt PASS1_BITS = 1; |
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28 const TInt FIX_0_298631336 = 2446; |
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29 const TInt FIX_0_390180644 = 3196; |
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30 const TInt FIX_0_541196100 = 4433; |
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31 const TInt FIX_0_765366865 = 6270; |
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32 const TInt FIX_0_899976223 = 7373; |
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33 const TInt FIX_1_175875602 = 9633; |
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34 const TInt FIX_1_501321110 = 12299; |
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35 const TInt FIX_1_847759065 = 15137; |
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36 const TInt FIX_1_961570560 = 16069; |
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37 const TInt FIX_2_053119869 = 16819; |
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38 const TInt FIX_2_562915447 = 20995; |
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39 const TInt FIX_3_072711026 = 25172; |
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40 // for fast dct |
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41 const TInt FIX_0_707106781 = 5793; |
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42 const TInt FIX_0_382683433 = 3135; |
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43 const TInt FIX_1_306562965 = 10703; |
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44 |
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45 // |
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46 // this file contains many performance-critical code, so use ARM instruction set for it |
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47 // |
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48 #ifdef __ARMCC__ |
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49 #pragma push |
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50 #pragma arm |
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51 #pragma O3 |
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52 #pragma Otime |
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53 #endif |
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54 |
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55 void TDCT::Transform(TDataUnit& aDestination,const TDataUnit& aSource, TBool aHighSpeedMode) const |
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56 { |
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57 TAligned64Du temp; |
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58 if (!aHighSpeedMode) |
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59 { |
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60 DoFirstStep(temp, aSource); |
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61 DoSecondStep(aDestination, temp); |
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62 } |
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63 else |
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64 { |
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65 DoFastFirstStep(temp, aSource); |
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66 DoFastSecondStep(aDestination, temp); |
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67 } |
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68 } |
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69 |
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70 void TDCT::DoFirstStep(TAligned64Du& aDestination,const TDataUnit& aSource) const |
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71 { |
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72 const TDataUnit::TDataUnitElemType* srcPtr = aSource.iCoeff; |
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73 |
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74 TInt* tempPtr = aDestination.iData; |
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75 const TDataUnit::TDataUnitElemType* const srcPtrLimit = srcPtr + KJpgDCTBlockSize; |
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76 |
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77 do |
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78 { |
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79 const TInt KDblShift = KDefPrecShift << 1; |
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80 TInt tmp0 = srcPtr[0] + srcPtr[7] - KDblShift; |
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81 TInt tmp7 = srcPtr[0] - srcPtr[7]; |
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82 TInt tmp1 = srcPtr[1] + srcPtr[6] - KDblShift; |
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83 TInt tmp6 = srcPtr[1] - srcPtr[6]; |
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84 TInt tmp2 = srcPtr[2] + srcPtr[5] - KDblShift; |
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85 TInt tmp5 = srcPtr[2] - srcPtr[5]; |
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86 TInt tmp3 = srcPtr[3] + srcPtr[4] - KDblShift; |
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87 TInt tmp4 = srcPtr[3] - srcPtr[4]; |
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88 |
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89 TInt tmp10 = tmp0 + tmp3; |
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90 TInt tmp13 = tmp0 - tmp3; |
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91 TInt tmp11 = tmp1 + tmp2; |
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92 TInt tmp12 = tmp1 - tmp2; |
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93 |
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94 tempPtr[0 * KJpgDCTBlockWidth] = ((tmp10 + tmp11) << PASS1_BITS); |
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95 tempPtr[4 * KJpgDCTBlockWidth] = ((tmp10 - tmp11) << PASS1_BITS); |
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96 |
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97 TInt z1 = (tmp12 + tmp13) * FIX_0_541196100; |
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98 tempPtr[2 * KJpgDCTBlockWidth] = DESCALE(z1 + (tmp13 * FIX_0_765366865),CONST_BITS - PASS1_BITS); |
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99 tempPtr[6 * KJpgDCTBlockWidth] = DESCALE(z1 + (tmp12 * - FIX_1_847759065),CONST_BITS - PASS1_BITS); |
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100 |
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101 z1 = tmp4 + tmp7; |
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102 TInt z2 = tmp5 + tmp6; |
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103 TInt z3 = tmp4 + tmp6; |
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104 TInt z4 = tmp5 + tmp7; |
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105 TInt z5 = (z3 + z4) * FIX_1_175875602; /* sqrt(2) * c3 */ |
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106 |
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107 tmp4 = tmp4 * FIX_0_298631336; /* sqrt(2) * (-c1+c3+c5-c7) */ |
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108 tmp5 = tmp5 * FIX_2_053119869; /* sqrt(2) * ( c1+c3-c5+c7) */ |
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109 tmp6 = tmp6 * FIX_3_072711026; /* sqrt(2) * ( c1+c3+c5-c7) */ |
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110 tmp7 = tmp7 * FIX_1_501321110; /* sqrt(2) * ( c1+c3-c5-c7) */ |
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111 z1 = z1 * - FIX_0_899976223; /* sqrt(2) * (c7-c3) */ |
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112 z2 = z2 * - FIX_2_562915447; /* sqrt(2) * (-c1-c3) */ |
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113 z3 = z3 * - FIX_1_961570560; /* sqrt(2) * (-c3-c5) */ |
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114 z4 = z4 * - FIX_0_390180644; /* sqrt(2) * (c5-c3) */ |
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115 |
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116 z3 += z5; |
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117 z4 += z5; |
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118 |
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119 tempPtr[7 * KJpgDCTBlockWidth] = DESCALE(tmp4 + z1 + z3, CONST_BITS - PASS1_BITS); |
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120 tempPtr[5 * KJpgDCTBlockWidth] = DESCALE(tmp5 + z2 + z4, CONST_BITS - PASS1_BITS); |
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121 tempPtr[3 * KJpgDCTBlockWidth] = DESCALE(tmp6 + z2 + z3, CONST_BITS - PASS1_BITS); |
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122 tempPtr[1 * KJpgDCTBlockWidth] = DESCALE(tmp7 + z1 + z4, CONST_BITS - PASS1_BITS); |
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123 |
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124 srcPtr += KJpgDCTBlockWidth; |
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125 tempPtr += 1; |
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126 } while (srcPtr < srcPtrLimit); |
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127 } |
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128 |
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129 // based on code from jfdctfst.c |
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130 void TDCT::DoFastFirstStep(TAligned64Du& aDestination,const TDataUnit& aSource) const |
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131 { |
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132 const TDataUnit::TDataUnitElemType* srcPtr = aSource.iCoeff; |
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133 |
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134 TInt* tempPtr = aDestination.iData; |
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135 const TDataUnit::TDataUnitElemType* const srcPtrLimit = srcPtr + KJpgDCTBlockSize; |
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136 |
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137 do |
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138 { |
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139 const TInt KDblShift = KDefPrecShift << 1; |
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140 TInt tmp0 = srcPtr[0] + srcPtr[7] - KDblShift; |
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141 TInt tmp7 = srcPtr[0] - srcPtr[7]; |
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142 TInt tmp1 = srcPtr[1] + srcPtr[6] - KDblShift; |
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143 TInt tmp6 = srcPtr[1] - srcPtr[6]; |
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144 TInt tmp2 = srcPtr[2] + srcPtr[5] - KDblShift; |
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145 TInt tmp5 = srcPtr[2] - srcPtr[5]; |
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146 TInt tmp3 = srcPtr[3] + srcPtr[4] - KDblShift; |
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147 TInt tmp4 = srcPtr[3] - srcPtr[4]; |
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148 |
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149 // Even part |
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150 TInt tmp10 = tmp0 + tmp3; // phase 2 |
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151 TInt tmp13 = tmp0 - tmp3; |
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152 TInt tmp11 = tmp1 + tmp2; |
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153 TInt tmp12 = tmp1 - tmp2; |
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154 |
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155 tempPtr[0 * KJpgDCTBlockWidth] = ((tmp10 + tmp11) << PASS1_BITS); // phase 3 |
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156 tempPtr[4 * KJpgDCTBlockWidth] = ((tmp10 - tmp11) << PASS1_BITS); |
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157 |
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158 TInt z1 = (tmp12 + tmp13) * FIX_0_707106781; |
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159 tempPtr[2 * KJpgDCTBlockWidth] = DESCALE(tmp13 + z1, CONST_BITS-PASS1_BITS); // phase 5 |
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160 tempPtr[6 * KJpgDCTBlockWidth] = DESCALE(tmp13 - z1, CONST_BITS-PASS1_BITS); |
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161 |
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162 // Odd part |
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163 tmp10 = tmp4 + tmp5; // phase 2 |
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164 tmp11 = tmp5 + tmp6; |
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165 tmp12 = tmp6 + tmp7; |
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166 |
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167 // The rotator is modified from fig 4-8 to avoid extra negations. |
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168 TInt z5 = (tmp10 - tmp12) * FIX_0_382683433; // c6 |
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169 TInt z2 = tmp10 * FIX_0_541196100 + z5; // c2-c6 |
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170 TInt z4 = tmp12 * FIX_1_306562965 + z5; // c2+c6 |
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171 TInt z3 = tmp11 * FIX_0_707106781; // c4 |
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172 |
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173 TInt z11 = tmp7 + z3; // phase 5 |
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174 TInt z13 = tmp7 - z3; |
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175 |
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176 tempPtr[5 * KJpgDCTBlockWidth] = DESCALE(z13 + z2,CONST_BITS - PASS1_BITS); // phase 6 |
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177 tempPtr[3 * KJpgDCTBlockWidth] = DESCALE(z13 - z2,CONST_BITS - PASS1_BITS); |
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178 tempPtr[1 * KJpgDCTBlockWidth] = DESCALE(z11 + z4,CONST_BITS - PASS1_BITS); |
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179 tempPtr[7 * KJpgDCTBlockWidth] = DESCALE(z11 - z4,CONST_BITS - PASS1_BITS); |
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180 |
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181 srcPtr += KJpgDCTBlockWidth; |
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182 tempPtr++; |
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183 } while (srcPtr < srcPtrLimit); |
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184 } |
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185 |
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186 |
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187 void TDCT::DoSecondStep(TDataUnit& aDestination,const TAligned64Du& aSource) const |
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188 { |
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189 TDataUnit::TDataUnitElemType* dstPtr= aDestination.iCoeff; |
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190 const TInt* srcPtr = aSource.iData; |
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191 const TInt* const srcPtrLimit = srcPtr + KJpgDCTBlockSize; |
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192 do |
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193 { |
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194 |
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195 register TAligned64TwoCoeff tmp = *( reinterpret_cast<const TAligned64TwoCoeff*>(srcPtr + 0) ); |
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196 |
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197 TInt tmp0 = tmp.iData[0] + srcPtr[7]; |
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198 TInt tmp7 = tmp.iData[0] - srcPtr[7]; |
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199 TInt tmp1 = tmp.iData[1] + srcPtr[6]; |
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200 TInt tmp6 = tmp.iData[1] - srcPtr[6]; |
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201 |
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202 tmp = *( reinterpret_cast<const TAligned64TwoCoeff*>(srcPtr + 2) ); |
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203 TInt tmp2 = tmp.iData[0] + srcPtr[5]; |
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204 TInt tmp5 = tmp.iData[0] - srcPtr[5]; |
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205 TInt tmp3 = tmp.iData[1] + srcPtr[4]; |
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206 TInt tmp4 = tmp.iData[1] - srcPtr[4]; |
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207 |
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208 TInt tmp10 = tmp0 + tmp3; |
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209 TInt tmp13 = tmp0 - tmp3; |
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210 TInt tmp11 = tmp1 + tmp2; |
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211 TInt tmp12 = tmp1 - tmp2; |
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212 |
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213 dstPtr[0 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp10 + tmp11, PASS1_BITS+3)); |
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214 dstPtr[4 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp10 - tmp11, PASS1_BITS+3)); |
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215 |
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216 TInt z1 = (tmp12 + tmp13) * FIX_0_541196100; |
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217 dstPtr[2 * KJpgDCTBlockWidth] = TInt16(DESCALE(z1 + (tmp13 * FIX_0_765366865),CONST_BITS+PASS1_BITS+3)); |
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218 dstPtr[6 * KJpgDCTBlockWidth] = TInt16(DESCALE(z1 + (tmp12 * - FIX_1_847759065),CONST_BITS+PASS1_BITS+3)); |
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219 |
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220 z1 = tmp4 + tmp7; |
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221 TInt z2 = tmp5 + tmp6; |
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222 TInt z3 = tmp4 + tmp6; |
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223 TInt z4 = tmp5 + tmp7; |
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224 TInt z5 = (z3 + z4) * FIX_1_175875602; /* sqrt(2) * c3 */ |
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225 |
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226 tmp4 = tmp4 * FIX_0_298631336; /* sqrt(2) * (-c1+c3+c5-c7) */ |
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227 tmp5 = tmp5 * FIX_2_053119869; /* sqrt(2) * ( c1+c3-c5+c7) */ |
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228 tmp6 = tmp6 * FIX_3_072711026; /* sqrt(2) * ( c1+c3+c5-c7) */ |
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229 tmp7 = tmp7 * FIX_1_501321110; /* sqrt(2) * ( c1+c3-c5-c7) */ |
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230 z1 = z1 * - FIX_0_899976223; /* sqrt(2) * (c7-c3) */ |
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231 z2 = z2 * - FIX_2_562915447; /* sqrt(2) * (-c1-c3) */ |
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232 z3 = z3 * - FIX_1_961570560; /* sqrt(2) * (-c3-c5) */ |
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233 z4 = z4 * - FIX_0_390180644; /* sqrt(2) * (c5-c3) */ |
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234 |
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235 z3 += z5; |
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236 z4 += z5; |
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237 |
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238 dstPtr[7 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp4 + z1 + z3,CONST_BITS+PASS1_BITS+3)); |
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239 dstPtr[5 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp5 + z2 + z4,CONST_BITS+PASS1_BITS+3)); |
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240 dstPtr[3 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp6 + z2 + z3,CONST_BITS+PASS1_BITS+3)); |
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241 dstPtr[1 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp7 + z1 + z4,CONST_BITS+PASS1_BITS+3)); |
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242 |
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243 srcPtr+=KJpgDCTBlockWidth; |
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244 dstPtr++; |
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245 } while (srcPtr < srcPtrLimit); |
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246 } |
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247 |
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248 // based on code from jfdctfst.c |
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249 void TDCT::DoFastSecondStep(TDataUnit& aDestination,const TAligned64Du& aSource) const |
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250 { |
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251 TDataUnit::TDataUnitElemType* dstPtr= aDestination.iCoeff; |
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252 const TInt* srcPtr = aSource.iData; |
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253 const TInt* const srcPtrLimit = srcPtr + KJpgDCTBlockSize; |
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254 do |
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255 { |
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256 register TAligned64TwoCoeff tmp = *( reinterpret_cast<const TAligned64TwoCoeff*>(srcPtr + 0) ); |
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257 |
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258 TInt tmp0 = tmp.iData[0] + srcPtr[7]; |
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259 TInt tmp7 = tmp.iData[0] - srcPtr[7]; |
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260 TInt tmp1 = tmp.iData[1] + srcPtr[6]; |
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261 TInt tmp6 = tmp.iData[1] - srcPtr[6]; |
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262 |
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263 tmp = *( reinterpret_cast<const TAligned64TwoCoeff*>(srcPtr + 2) ); |
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264 TInt tmp2 = tmp.iData[0] + srcPtr[5]; |
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265 TInt tmp5 = tmp.iData[0] - srcPtr[5]; |
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266 TInt tmp3 = tmp.iData[1] + srcPtr[4]; |
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267 TInt tmp4 = tmp.iData[1] - srcPtr[4]; |
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268 |
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269 TInt tmp10 = tmp0 + tmp3; // phase 2 |
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270 TInt tmp13 = tmp0 - tmp3; |
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271 TInt tmp11 = tmp1 + tmp2; |
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272 TInt tmp12 = tmp1 - tmp2; |
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273 |
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274 dstPtr[0 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp10 + tmp11, PASS1_BITS+3)); // phase 3 |
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275 dstPtr[4 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp10 - tmp11, PASS1_BITS+3)); |
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276 |
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277 TInt z1 = (tmp12 + tmp13) * FIX_0_707106781; // c4 |
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278 dstPtr[2 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp13 + z1, CONST_BITS+PASS1_BITS+3)); // phase 5 |
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279 dstPtr[6 * KJpgDCTBlockWidth] = TInt16(DESCALE(tmp13 - z1, CONST_BITS+PASS1_BITS+3)); |
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280 |
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281 |
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282 // Odd part |
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283 tmp10 = tmp4 + tmp5; // phase 2 |
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284 tmp11 = tmp5 + tmp6; |
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285 tmp12 = tmp6 + tmp7; |
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286 |
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287 // The rotator is modified from fig 4-8 to avoid extra negations. |
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288 TInt z5 = (tmp10 - tmp12) * FIX_0_382683433; // c6 |
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289 TInt z2 = tmp10 * FIX_0_541196100 + z5; // c2-c6 |
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290 TInt z4 = tmp12 * FIX_1_306562965 + z5; // c2+c6 |
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291 TInt z3 = tmp11 * FIX_0_707106781; // c4 |
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292 |
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293 TInt z11 = tmp7 + z3; // phase 5 |
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294 TInt z13 = tmp7 - z3; |
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295 |
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296 dstPtr[5 * KJpgDCTBlockWidth] = TInt16(DESCALE(z13 + z2, CONST_BITS+PASS1_BITS+3)); // phase 6 |
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297 dstPtr[3 * KJpgDCTBlockWidth] = TInt16(DESCALE(z13 - z2, CONST_BITS+PASS1_BITS+3)); |
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298 dstPtr[1 * KJpgDCTBlockWidth] = TInt16(DESCALE(z11 + z4, CONST_BITS+PASS1_BITS+3)); |
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299 dstPtr[7 * KJpgDCTBlockWidth] = TInt16(DESCALE(z11 - z4, CONST_BITS+PASS1_BITS+3)); |
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300 |
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301 srcPtr+=KJpgDCTBlockWidth; |
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302 dstPtr++; |
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303 } while (srcPtr < srcPtrLimit); |
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304 } |
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305 |
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306 |
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307 void TDCT::InverseTransform(TDataUnit& aDestination,const TDataUnit& aSource) const |
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308 { |
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309 const TInt16* srcPtr = aSource.iCoeff; |
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310 TInt16* dstPtr = aDestination.iCoeff; |
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311 |
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312 TInt temp[KJpgDCTBlockSize]; |
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313 TInt* tempPtr = temp; |
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314 TInt* tempPtrLimit = temp + KJpgDCTBlockWidth; |
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315 |
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316 do |
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317 { |
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318 TInt z2 = srcPtr[2 * KJpgDCTBlockWidth]; |
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319 TInt z3 = srcPtr[6 * KJpgDCTBlockWidth]; |
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320 |
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321 if (z2 == 0 && z3 == 0 && srcPtr[1 * KJpgDCTBlockWidth] == 0 && |
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322 srcPtr[3 * KJpgDCTBlockWidth] == 0 && srcPtr[4 * KJpgDCTBlockWidth] == 0 && |
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323 srcPtr[5 * KJpgDCTBlockWidth] == 0 && |
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324 srcPtr[7 * KJpgDCTBlockWidth] == 0) |
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325 { |
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326 TInt dcval = srcPtr[0] << PASS1_BITS; |
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327 |
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328 tempPtr[0 * KJpgDCTBlockWidth] = dcval; |
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329 tempPtr[1 * KJpgDCTBlockWidth] = dcval; |
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330 tempPtr[2 * KJpgDCTBlockWidth] = dcval; |
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331 tempPtr[3 * KJpgDCTBlockWidth] = dcval; |
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332 tempPtr[4 * KJpgDCTBlockWidth] = dcval; |
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333 tempPtr[5 * KJpgDCTBlockWidth] = dcval; |
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334 tempPtr[6 * KJpgDCTBlockWidth] = dcval; |
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335 tempPtr[7 * KJpgDCTBlockWidth] = dcval; |
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336 |
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337 srcPtr++; |
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338 tempPtr++; |
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339 continue; |
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340 } |
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341 |
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342 TInt z1 = (z2 + z3) * FIX_0_541196100; |
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343 TInt tmp2 = z1 + (z3 * - FIX_1_847759065); |
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344 TInt tmp3 = z1 + (z2 * FIX_0_765366865); |
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345 |
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346 z2 = srcPtr[0 * KJpgDCTBlockWidth]; |
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347 z3 = srcPtr[4 * KJpgDCTBlockWidth]; |
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348 |
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349 TInt tmp0 = (z2 + z3) << CONST_BITS; |
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350 TInt tmp1 = (z2 - z3) << CONST_BITS; |
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351 |
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352 const TInt tmp10 = tmp0 + tmp3; |
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353 const TInt tmp13 = tmp0 - tmp3; |
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354 const TInt tmp11 = tmp1 + tmp2; |
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355 const TInt tmp12 = tmp1 - tmp2; |
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356 |
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357 tmp0 = srcPtr[7 * KJpgDCTBlockWidth]; |
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358 tmp1 = srcPtr[5 * KJpgDCTBlockWidth]; |
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359 tmp2 = srcPtr[3 * KJpgDCTBlockWidth]; |
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360 tmp3 = srcPtr[1 * KJpgDCTBlockWidth]; |
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361 |
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362 z1 = tmp0 + tmp3; |
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363 z2 = tmp1 + tmp2; |
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364 z3 = tmp0 + tmp2; |
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365 TInt z4 = tmp1 + tmp3; |
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366 const TInt z5 = (z3 + z4) * FIX_1_175875602; |
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367 |
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368 tmp0 = tmp0 * FIX_0_298631336; |
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369 tmp1 = tmp1 * FIX_2_053119869; |
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370 tmp2 = tmp2 * FIX_3_072711026; |
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371 tmp3 = tmp3 * FIX_1_501321110; |
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372 z1 = z1 * - FIX_0_899976223; |
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373 z2 = z2 * - FIX_2_562915447; |
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374 z3 = z3 * - FIX_1_961570560; |
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375 z4 = z4 * - FIX_0_390180644; |
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376 |
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377 z3 += z5; |
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378 z4 += z5; |
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379 |
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380 tmp0 += z1 + z3; |
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381 tmp1 += z2 + z4; |
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382 tmp2 += z2 + z3; |
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383 tmp3 += z1 + z4; |
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384 |
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385 tempPtr[0 * KJpgDCTBlockWidth] = DESCALE(tmp10 + tmp3, CONST_BITS - PASS1_BITS); |
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386 tempPtr[7 * KJpgDCTBlockWidth] = DESCALE(tmp10 - tmp3, CONST_BITS - PASS1_BITS); |
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387 tempPtr[1 * KJpgDCTBlockWidth] = DESCALE(tmp11 + tmp2, CONST_BITS - PASS1_BITS); |
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388 tempPtr[6 * KJpgDCTBlockWidth] = DESCALE(tmp11 - tmp2, CONST_BITS - PASS1_BITS); |
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389 tempPtr[2 * KJpgDCTBlockWidth] = DESCALE(tmp12 + tmp1, CONST_BITS - PASS1_BITS); |
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390 tempPtr[5 * KJpgDCTBlockWidth] = DESCALE(tmp12 - tmp1, CONST_BITS - PASS1_BITS); |
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391 tempPtr[3 * KJpgDCTBlockWidth] = DESCALE(tmp13 + tmp0, CONST_BITS - PASS1_BITS); |
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392 tempPtr[4 * KJpgDCTBlockWidth] = DESCALE(tmp13 - tmp0, CONST_BITS - PASS1_BITS); |
|
393 |
|
394 srcPtr++; |
|
395 tempPtr++; |
|
396 } while (tempPtr < tempPtrLimit); |
|
397 |
|
398 tempPtr = temp; |
|
399 tempPtrLimit = temp + KJpgDCTBlockSize; |
|
400 |
|
401 do |
|
402 { |
|
403 TInt z2 = tempPtr[2]; |
|
404 TInt z3 = tempPtr[6]; |
|
405 const TInt t4 = tempPtr[4]; |
|
406 |
|
407 if (z2 == 0 && z3 == 0 && tempPtr[1] == 0 && t4 == 0 && tempPtr[3] == 0 && |
|
408 tempPtr[5] == 0 && tempPtr[7] == 0) |
|
409 { |
|
410 TUint16 dcval = TUint16( TInt16(DESCALE(tempPtr[0], PASS1_BITS+3) + iLevelShift) ); |
|
411 TUint64 w=MAKE_TUINT64( ((dcval << 16) | (dcval)), ((dcval << 16) | dcval) ); |
|
412 |
|
413 *(0 + reinterpret_cast<TUint64*>(dstPtr) ) = w; |
|
414 *(1 + reinterpret_cast<TUint64*>(dstPtr) ) = w; |
|
415 |
|
416 dstPtr += KJpgDCTBlockWidth; |
|
417 tempPtr += KJpgDCTBlockWidth; |
|
418 continue; |
|
419 } |
|
420 |
|
421 TInt z1 = (z2 + z3) * FIX_0_541196100; |
|
422 TInt tmp2 = z1 + (z3 * - FIX_1_847759065); |
|
423 TInt tmp3 = z1 + (z2 * FIX_0_765366865); |
|
424 |
|
425 TInt tmp0 = (tempPtr[0] + t4) << CONST_BITS; |
|
426 TInt tmp1 = (tempPtr[0] - t4) << CONST_BITS; |
|
427 |
|
428 const TInt tmp10 = tmp0 + tmp3; |
|
429 const TInt tmp13 = tmp0 - tmp3; |
|
430 const TInt tmp11 = tmp1 + tmp2; |
|
431 const TInt tmp12 = tmp1 - tmp2; |
|
432 |
|
433 tmp0 = tempPtr[7]; |
|
434 tmp1 = tempPtr[5]; |
|
435 tmp2 = tempPtr[3]; |
|
436 tmp3 = tempPtr[1]; |
|
437 |
|
438 z1 = tmp0 + tmp3; |
|
439 z2 = tmp1 + tmp2; |
|
440 z3 = tmp0 + tmp2; |
|
441 TInt z4 = tmp1 + tmp3; |
|
442 const TInt z5 = (z3 + z4) * FIX_1_175875602; |
|
443 |
|
444 tmp0 = tmp0 * FIX_0_298631336; |
|
445 tmp1 = tmp1 * FIX_2_053119869; |
|
446 tmp2 = tmp2 * FIX_3_072711026; |
|
447 tmp3 = tmp3 * FIX_1_501321110; |
|
448 |
|
449 z1 = z1 * - FIX_0_899976223; |
|
450 z2 = z2 * - FIX_2_562915447; |
|
451 z3 = z3 * - FIX_1_961570560; |
|
452 z4 = z4 * - FIX_0_390180644; |
|
453 |
|
454 z3 += z5; |
|
455 z4 += z5; |
|
456 |
|
457 tmp0 += z1 + z3; |
|
458 tmp1 += z2 + z4; |
|
459 tmp2 += z2 + z3; |
|
460 tmp3 += z1 + z4; |
|
461 |
|
462 const TInt KLevelShift = iLevelShift; |
|
463 dstPtr[0] = TInt16(DESCALE(tmp10 + tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
464 dstPtr[7] = TInt16(DESCALE(tmp10 - tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
465 dstPtr[1] = TInt16(DESCALE(tmp11 + tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
466 dstPtr[6] = TInt16(DESCALE(tmp11 - tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
467 dstPtr[2] = TInt16(DESCALE(tmp12 + tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
468 dstPtr[5] = TInt16(DESCALE(tmp12 - tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
469 dstPtr[3] = TInt16(DESCALE(tmp13 + tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
470 dstPtr[4] = TInt16(DESCALE(tmp13 - tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
471 |
|
472 tempPtr += KJpgDCTBlockWidth; |
|
473 dstPtr += KJpgDCTBlockWidth; |
|
474 } while (tempPtr < tempPtrLimit); |
|
475 } |
|
476 |
|
477 |
|
478 // THalfDCT |
|
479 void THalfDCT::InverseTransform(TDataUnit& aDestination,const TDataUnit& aSource) const |
|
480 { |
|
481 const TInt16* srcPtr = aSource.iCoeff; |
|
482 TInt16* dstPtr = aDestination.iCoeff; |
|
483 |
|
484 TInt temp[KJpgDCTBlockSize]; |
|
485 TInt* tempPtr = temp; |
|
486 TInt* tempPtrLimit = temp + KJpgDCTBlockWidth; |
|
487 |
|
488 while (tempPtr < tempPtrLimit) |
|
489 { |
|
490 TInt z2 = srcPtr[2 * KJpgDCTBlockWidth]; |
|
491 |
|
492 if (z2 == 0 && srcPtr[1 * KJpgDCTBlockWidth] == 0 && |
|
493 srcPtr[3 * KJpgDCTBlockWidth] == 0) |
|
494 { |
|
495 TInt dcval = srcPtr[0] << PASS1_BITS; |
|
496 |
|
497 tempPtr[0 * KJpgDCTBlockWidth] = dcval; |
|
498 tempPtr[1 * KJpgDCTBlockWidth] = dcval; |
|
499 tempPtr[2 * KJpgDCTBlockWidth] = dcval; |
|
500 tempPtr[3 * KJpgDCTBlockWidth] = dcval; |
|
501 tempPtr[4 * KJpgDCTBlockWidth] = dcval; |
|
502 tempPtr[5 * KJpgDCTBlockWidth] = dcval; |
|
503 tempPtr[6 * KJpgDCTBlockWidth] = dcval; |
|
504 tempPtr[7 * KJpgDCTBlockWidth] = dcval; |
|
505 |
|
506 srcPtr++; |
|
507 tempPtr++; |
|
508 continue; |
|
509 } |
|
510 |
|
511 TInt z1 = z2 * FIX_0_541196100; |
|
512 TInt tmp2 = z1; |
|
513 TInt tmp3 = z1 + (z2 * FIX_0_765366865); |
|
514 |
|
515 z2 = srcPtr[0 * KJpgDCTBlockWidth]; |
|
516 |
|
517 TInt tmp0 = z2 << CONST_BITS; |
|
518 |
|
519 const TInt tmp10 = tmp0 + tmp3; |
|
520 const TInt tmp13 = tmp0 - tmp3; |
|
521 const TInt tmp11 = tmp0 + tmp2; |
|
522 const TInt tmp12 = tmp0 - tmp2; |
|
523 |
|
524 tmp2 = srcPtr[3 * KJpgDCTBlockWidth]; |
|
525 tmp3 = srcPtr[1 * KJpgDCTBlockWidth]; |
|
526 |
|
527 z1 = tmp3; |
|
528 z2 = tmp2; |
|
529 TInt z3 = tmp2; |
|
530 TInt z4 = tmp3; |
|
531 const TInt z5 = (z3 + z4) * FIX_1_175875602; |
|
532 |
|
533 tmp2 = tmp2 * FIX_3_072711026; |
|
534 tmp3 = tmp3 * FIX_1_501321110; |
|
535 z1 = z1 * - FIX_0_899976223; |
|
536 z2 = z2 * - FIX_2_562915447; |
|
537 z3 = z3 * - FIX_1_961570560; |
|
538 z4 = z4 * - FIX_0_390180644; |
|
539 |
|
540 z3 += z5; |
|
541 z4 += z5; |
|
542 |
|
543 tmp0 = z1 + z3; |
|
544 const TInt tmp1 = z2 + z4; |
|
545 tmp2 += z2 + z3; |
|
546 tmp3 += z1 + z4; |
|
547 |
|
548 tempPtr[0 * KJpgDCTBlockWidth] = DESCALE(tmp10 + tmp3, CONST_BITS - PASS1_BITS); |
|
549 tempPtr[7 * KJpgDCTBlockWidth] = DESCALE(tmp10 - tmp3, CONST_BITS - PASS1_BITS); |
|
550 tempPtr[1 * KJpgDCTBlockWidth] = DESCALE(tmp11 + tmp2, CONST_BITS - PASS1_BITS); |
|
551 tempPtr[6 * KJpgDCTBlockWidth] = DESCALE(tmp11 - tmp2, CONST_BITS - PASS1_BITS); |
|
552 tempPtr[2 * KJpgDCTBlockWidth] = DESCALE(tmp12 + tmp1, CONST_BITS - PASS1_BITS); |
|
553 tempPtr[5 * KJpgDCTBlockWidth] = DESCALE(tmp12 - tmp1, CONST_BITS - PASS1_BITS); |
|
554 tempPtr[3 * KJpgDCTBlockWidth] = DESCALE(tmp13 + tmp0, CONST_BITS - PASS1_BITS); |
|
555 tempPtr[4 * KJpgDCTBlockWidth] = DESCALE(tmp13 - tmp0, CONST_BITS - PASS1_BITS); |
|
556 |
|
557 srcPtr++; |
|
558 tempPtr++; |
|
559 } |
|
560 |
|
561 tempPtr = temp; |
|
562 tempPtrLimit = temp + KJpgDCTBlockSize; |
|
563 |
|
564 while (tempPtr < tempPtrLimit) |
|
565 { |
|
566 TInt z2 = tempPtr[2]; |
|
567 |
|
568 if (z2 == 0 && tempPtr[1] == 0 && tempPtr[3] == 0) |
|
569 { |
|
570 TUint16 dcval = TUint16( TInt16(DESCALE(tempPtr[0], PASS1_BITS+3) + iLevelShift) ); |
|
571 TUint64 w=MAKE_TUINT64( ((dcval << 16) | (dcval)), ((dcval << 16) | dcval) ); |
|
572 |
|
573 *(0 + reinterpret_cast<TUint64*>(dstPtr) ) = w; |
|
574 *(1 + reinterpret_cast<TUint64*>(dstPtr) ) = w; |
|
575 |
|
576 dstPtr += KJpgDCTBlockWidth; |
|
577 tempPtr += KJpgDCTBlockWidth; |
|
578 continue; |
|
579 } |
|
580 |
|
581 TInt z1 = z2 * FIX_0_541196100; |
|
582 TInt tmp2 = z1; |
|
583 TInt tmp3 = z1 + (z2 * FIX_0_765366865); |
|
584 |
|
585 TInt tmp0 = tempPtr[0] << CONST_BITS; |
|
586 |
|
587 const TInt tmp10 = tmp0 + tmp3; |
|
588 const TInt tmp13 = tmp0 - tmp3; |
|
589 const TInt tmp11 = tmp0 + tmp2; |
|
590 const TInt tmp12 = tmp0 - tmp2; |
|
591 |
|
592 tmp2 = tempPtr[3]; |
|
593 tmp3 = tempPtr[1]; |
|
594 |
|
595 z1 = tmp3; |
|
596 z2 = tmp2; |
|
597 TInt z3 = tmp2; |
|
598 TInt z4 = tmp3; |
|
599 const TInt z5 = (z3 + z4) * FIX_1_175875602; |
|
600 |
|
601 tmp2 = tmp2 * FIX_3_072711026; |
|
602 tmp3 = tmp3 * FIX_1_501321110; |
|
603 |
|
604 z1 = z1 * - FIX_0_899976223; |
|
605 z2 = z2 * - FIX_2_562915447; |
|
606 z3 = z3 * - FIX_1_961570560; |
|
607 z4 = z4 * - FIX_0_390180644; |
|
608 |
|
609 z3 += z5; |
|
610 z4 += z5; |
|
611 |
|
612 tmp0 = z1 + z3; |
|
613 const TInt tmp1 = z2 + z4; |
|
614 tmp2 += z2 + z3; |
|
615 tmp3 += z1 + z4; |
|
616 |
|
617 const TInt KLevelShift = iLevelShift; |
|
618 dstPtr[0] = TInt16(DESCALE(tmp10 + tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
619 dstPtr[7] = TInt16(DESCALE(tmp10 - tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
620 dstPtr[1] = TInt16(DESCALE(tmp11 + tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
621 dstPtr[6] = TInt16(DESCALE(tmp11 - tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
622 dstPtr[2] = TInt16(DESCALE(tmp12 + tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
623 dstPtr[5] = TInt16(DESCALE(tmp12 - tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
624 dstPtr[3] = TInt16(DESCALE(tmp13 + tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
625 dstPtr[4] = TInt16(DESCALE(tmp13 - tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
626 |
|
627 tempPtr += KJpgDCTBlockWidth; |
|
628 dstPtr += KJpgDCTBlockWidth; |
|
629 } |
|
630 } |
|
631 |
|
632 //TFastHalfDCT |
|
633 void TFastHalfDCT::InverseTransform(TDataUnit& aDestination,const TDataUnit& aSource) const |
|
634 { |
|
635 const TInt KScalingFactor = 2; |
|
636 const TInt16* srcPtr = aSource.iCoeff; |
|
637 TInt16* dstPtr = aDestination.iCoeff; |
|
638 |
|
639 TInt temp[KJpgDCTBlockSize/KScalingFactor]; |
|
640 |
|
641 TInt* tempPtr = temp; |
|
642 TInt* tempPtrLimit = temp + KJpgDCTBlockWidth / KScalingFactor; // scaling factor |
|
643 |
|
644 do |
|
645 { |
|
646 TInt z2 = srcPtr[2 * KJpgDCTBlockWidth]; |
|
647 |
|
648 if ( z2 == 0 && srcPtr[1 * KJpgDCTBlockWidth] == 0 && srcPtr[3 * KJpgDCTBlockWidth] == 0) |
|
649 { |
|
650 TInt dcval = srcPtr[0] << PASS1_BITS; |
|
651 |
|
652 tempPtr[0 * KJpgDCTBlockWidth / KScalingFactor] = dcval; |
|
653 tempPtr[2 * KJpgDCTBlockWidth / KScalingFactor] = dcval; |
|
654 tempPtr[4 * KJpgDCTBlockWidth / KScalingFactor] = dcval; |
|
655 tempPtr[6 * KJpgDCTBlockWidth / KScalingFactor] = dcval; |
|
656 |
|
657 srcPtr++; |
|
658 tempPtr++; |
|
659 continue; |
|
660 } |
|
661 |
|
662 TInt z1 = z2 * FIX_0_541196100; |
|
663 TInt tmp2 = z1; |
|
664 TInt tmp3 = z1 + (z2 * FIX_0_765366865); |
|
665 |
|
666 z2 = srcPtr[0 * KJpgDCTBlockWidth]; |
|
667 |
|
668 TInt tmp0 = z2 << CONST_BITS; |
|
669 |
|
670 const TInt tmp10 = tmp0 + tmp3; |
|
671 const TInt tmp13 = tmp0 - tmp3; |
|
672 const TInt tmp11 = tmp0 + tmp2; |
|
673 const TInt tmp12 = tmp0 - tmp2; |
|
674 |
|
675 tmp2 = srcPtr[3 * KJpgDCTBlockWidth]; |
|
676 tmp3 = srcPtr[1 * KJpgDCTBlockWidth]; |
|
677 |
|
678 z1 = tmp3; |
|
679 z2 = tmp2; |
|
680 TInt z3 = tmp2; |
|
681 TInt z4 = tmp3; |
|
682 const TInt z5 = (z3 + z4) * FIX_1_175875602; |
|
683 |
|
684 tmp2 = tmp2 * FIX_3_072711026; |
|
685 tmp3 = tmp3 * FIX_1_501321110; |
|
686 z1 = z1 * - FIX_0_899976223; |
|
687 z2 = z2 * - FIX_2_562915447; |
|
688 z3 = z3 * - FIX_1_961570560; |
|
689 z4 = z4 * - FIX_0_390180644; |
|
690 |
|
691 z3 += z5; |
|
692 z4 += z5; |
|
693 |
|
694 tmp0 = z1 + z3; |
|
695 const TInt tmp1 = z2 + z4; |
|
696 tmp2 += z2 + z3; |
|
697 tmp3 += z1 + z4; |
|
698 |
|
699 tempPtr[0 * KJpgDCTBlockWidth / KScalingFactor] = DESCALE(tmp10 + tmp3, CONST_BITS - PASS1_BITS); |
|
700 tempPtr[2 * KJpgDCTBlockWidth / KScalingFactor] = DESCALE(tmp12 + tmp1, CONST_BITS - PASS1_BITS); |
|
701 tempPtr[4 * KJpgDCTBlockWidth / KScalingFactor] = DESCALE(tmp13 - tmp0, CONST_BITS - PASS1_BITS); |
|
702 tempPtr[6 * KJpgDCTBlockWidth / KScalingFactor] = DESCALE(tmp11 - tmp2, CONST_BITS - PASS1_BITS); |
|
703 |
|
704 srcPtr++; |
|
705 tempPtr++; |
|
706 |
|
707 } while (tempPtr < tempPtrLimit); |
|
708 |
|
709 tempPtr = temp; |
|
710 tempPtrLimit = temp + KJpgDCTBlockSize / KScalingFactor; |
|
711 |
|
712 do |
|
713 { |
|
714 TInt z2 = tempPtr[2]; |
|
715 |
|
716 if ( z2 == 0 && tempPtr[1] == 0 && tempPtr[3] == 0) |
|
717 { |
|
718 TInt16 dcval = TInt16(DESCALE(tempPtr[0], PASS1_BITS+3) + iLevelShift); |
|
719 |
|
720 dstPtr[0] = dcval; |
|
721 dstPtr[2] = dcval; |
|
722 dstPtr[4] = dcval; |
|
723 dstPtr[6] = dcval; |
|
724 |
|
725 tempPtr += KJpgDCTBlockWidth; |
|
726 dstPtr += KScalingFactor*KJpgDCTBlockWidth; |
|
727 continue; |
|
728 } |
|
729 |
|
730 TInt z1 = z2 * FIX_0_541196100; |
|
731 TInt tmp2 = z1; |
|
732 TInt tmp3 = z1 + (z2 * FIX_0_765366865); |
|
733 |
|
734 TInt tmp0 = tempPtr[0] << CONST_BITS; |
|
735 |
|
736 const TInt tmp10 = tmp0 + tmp3; |
|
737 const TInt tmp13 = tmp0 - tmp3; |
|
738 const TInt tmp11 = tmp0 + tmp2; |
|
739 const TInt tmp12 = tmp0 - tmp2; |
|
740 |
|
741 tmp2 = tempPtr[3]; |
|
742 tmp3 = tempPtr[1]; |
|
743 |
|
744 z1 = tmp3; |
|
745 z2 = tmp2; |
|
746 TInt z3 = tmp2; |
|
747 TInt z4 = tmp3; |
|
748 TInt z5 = (z3 + z4) * FIX_1_175875602; |
|
749 |
|
750 tmp2 = tmp2 * FIX_3_072711026; |
|
751 tmp3 = tmp3 * FIX_1_501321110; |
|
752 |
|
753 z1 = z1 * - FIX_0_899976223; |
|
754 z2 = z2 * - FIX_2_562915447; |
|
755 z3 = z3 * - FIX_1_961570560; |
|
756 z4 = z4 * - FIX_0_390180644; |
|
757 |
|
758 z3 += z5; |
|
759 z4 += z5; |
|
760 |
|
761 tmp0 = z1 + z3; |
|
762 const TInt tmp1 = z2 + z4; |
|
763 tmp2 += z2 + z3; |
|
764 tmp3 += z1 + z4; |
|
765 |
|
766 const TInt KLevelShift = iLevelShift; |
|
767 dstPtr[0] = TInt16(DESCALE(tmp10 + tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
768 dstPtr[2] = TInt16(DESCALE(tmp12 + tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
769 dstPtr[4] = TInt16(DESCALE(tmp13 - tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
770 dstPtr[6] = TInt16(DESCALE(tmp11 - tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
771 |
|
772 tempPtr += KJpgDCTBlockWidth; |
|
773 dstPtr += KScalingFactor*KJpgDCTBlockWidth; |
|
774 |
|
775 } while (tempPtr < tempPtrLimit); |
|
776 } |
|
777 |
|
778 // TQuarterDCT |
|
779 void TQuarterDCT::InverseTransform(TDataUnit& aDestination,const TDataUnit& aSource) const |
|
780 { |
|
781 const TInt16* srcPtr = aSource.iCoeff; |
|
782 TInt16* dstPtr = aDestination.iCoeff; |
|
783 |
|
784 TInt temp[KJpgDCTBlockSize]; |
|
785 TInt* tempPtr = temp; |
|
786 TInt* tempPtrLimit = temp + KJpgDCTBlockWidth; |
|
787 |
|
788 do |
|
789 { |
|
790 TInt tmp3 = srcPtr[1 * KJpgDCTBlockWidth]; |
|
791 |
|
792 if (tmp3 == 0) |
|
793 { |
|
794 TInt dcval = srcPtr[0] << PASS1_BITS; |
|
795 |
|
796 tempPtr[0 * KJpgDCTBlockWidth] = dcval; |
|
797 tempPtr[1 * KJpgDCTBlockWidth] = dcval; |
|
798 tempPtr[2 * KJpgDCTBlockWidth] = dcval; |
|
799 tempPtr[3 * KJpgDCTBlockWidth] = dcval; |
|
800 tempPtr[4 * KJpgDCTBlockWidth] = dcval; |
|
801 tempPtr[5 * KJpgDCTBlockWidth] = dcval; |
|
802 tempPtr[6 * KJpgDCTBlockWidth] = dcval; |
|
803 tempPtr[7 * KJpgDCTBlockWidth] = dcval; |
|
804 |
|
805 srcPtr++; |
|
806 tempPtr++; |
|
807 continue; |
|
808 } |
|
809 |
|
810 TInt z2 = srcPtr[0 * KJpgDCTBlockWidth]; |
|
811 |
|
812 TInt tmp0 = z2 << CONST_BITS; |
|
813 |
|
814 TInt tmp10 = tmp0; |
|
815 |
|
816 TInt z1 = tmp3; |
|
817 TInt z4 = tmp3; |
|
818 TInt z5 = z4 * FIX_1_175875602; |
|
819 |
|
820 tmp3 = tmp3 * FIX_1_501321110; |
|
821 z1 = z1 * - FIX_0_899976223; |
|
822 z4 = z4 * - FIX_0_390180644; |
|
823 |
|
824 const TInt z3 = z5; |
|
825 z4 += z5; |
|
826 |
|
827 tmp0 = z1 + z3; |
|
828 const TInt tmp1 = z4; |
|
829 const TInt tmp2 = z3; |
|
830 tmp3 += z1 + z4; |
|
831 |
|
832 tempPtr[0 * KJpgDCTBlockWidth] = DESCALE(tmp10 + tmp3, CONST_BITS - PASS1_BITS); |
|
833 tempPtr[7 * KJpgDCTBlockWidth] = DESCALE(tmp10 - tmp3, CONST_BITS - PASS1_BITS); |
|
834 tempPtr[1 * KJpgDCTBlockWidth] = DESCALE(tmp10 + tmp2, CONST_BITS - PASS1_BITS); |
|
835 tempPtr[6 * KJpgDCTBlockWidth] = DESCALE(tmp10 - tmp2, CONST_BITS - PASS1_BITS); |
|
836 tempPtr[2 * KJpgDCTBlockWidth] = DESCALE(tmp10 + tmp1, CONST_BITS - PASS1_BITS); |
|
837 tempPtr[5 * KJpgDCTBlockWidth] = DESCALE(tmp10 - tmp1, CONST_BITS - PASS1_BITS); |
|
838 tempPtr[3 * KJpgDCTBlockWidth] = DESCALE(tmp10 + tmp0, CONST_BITS - PASS1_BITS); |
|
839 tempPtr[4 * KJpgDCTBlockWidth] = DESCALE(tmp10 - tmp0, CONST_BITS - PASS1_BITS); |
|
840 |
|
841 srcPtr++; |
|
842 tempPtr++; |
|
843 } while (tempPtr < tempPtrLimit); |
|
844 |
|
845 tempPtr = temp; |
|
846 tempPtrLimit = temp + KJpgDCTBlockSize; |
|
847 |
|
848 do |
|
849 { |
|
850 TInt tmp3 = tempPtr[1]; |
|
851 |
|
852 if (tmp3 == 0) |
|
853 { |
|
854 TUint16 dcval = TUint16( TInt16(DESCALE(tempPtr[0], PASS1_BITS+3) + iLevelShift) ); |
|
855 |
|
856 TUint64 w=MAKE_TUINT64( ((dcval << 16) | (dcval)), ((dcval << 16) | dcval) ); |
|
857 |
|
858 *(0 + reinterpret_cast<TUint64*>(dstPtr) ) = w; |
|
859 *(1 + reinterpret_cast<TUint64*>(dstPtr) ) = w; |
|
860 |
|
861 tempPtr += KJpgDCTBlockWidth; |
|
862 dstPtr += KJpgDCTBlockWidth; |
|
863 continue; |
|
864 } |
|
865 |
|
866 TInt tmp10 = tempPtr[0] << CONST_BITS; |
|
867 |
|
868 |
|
869 TInt z1 = tmp3; |
|
870 TInt z4 = tmp3; |
|
871 TInt z5 = z4 * FIX_1_175875602; |
|
872 |
|
873 tmp3 = tmp3 * FIX_1_501321110; |
|
874 |
|
875 z1 = z1 * - FIX_0_899976223; |
|
876 z4 = z4 * - FIX_0_390180644; |
|
877 |
|
878 z4 += z5; |
|
879 |
|
880 const TInt tmp0 = z1 + z5; |
|
881 const TInt tmp1 = z4; |
|
882 const TInt tmp2 = z5; |
|
883 tmp3 += z1 + z4; |
|
884 |
|
885 const TInt KLevelShift = iLevelShift; |
|
886 dstPtr[0] = TInt16(DESCALE(tmp10 + tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
887 dstPtr[7] = TInt16(DESCALE(tmp10 - tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
888 dstPtr[1] = TInt16(DESCALE(tmp10 + tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
889 dstPtr[6] = TInt16(DESCALE(tmp10 - tmp2,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
890 dstPtr[2] = TInt16(DESCALE(tmp10 + tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
891 dstPtr[5] = TInt16(DESCALE(tmp10 - tmp1,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
892 dstPtr[3] = TInt16(DESCALE(tmp10 + tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
893 dstPtr[4] = TInt16(DESCALE(tmp10 - tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
894 |
|
895 tempPtr += KJpgDCTBlockWidth; |
|
896 dstPtr += KJpgDCTBlockWidth; |
|
897 } while (tempPtr < tempPtrLimit); |
|
898 } |
|
899 |
|
900 // TFastQuarterDCT |
|
901 void TFastQuarterDCT::InverseTransform(TDataUnit& aDestination,const TDataUnit& aSource) const |
|
902 { |
|
903 const TInt KScalingFactor=4; |
|
904 const TInt16* srcPtr= aSource.iCoeff; |
|
905 TInt16* dstPtr = aDestination.iCoeff; |
|
906 |
|
907 TInt temp[KJpgDCTBlockWidth]; |
|
908 |
|
909 TInt* tempPtr = temp; |
|
910 TInt* tempPtrLimit = temp + KJpgDCTBlockWidth / KScalingFactor; //scaling factor |
|
911 |
|
912 do |
|
913 { |
|
914 TInt tmp3 = srcPtr[1 * KJpgDCTBlockWidth]; |
|
915 |
|
916 if (tmp3 == 0) |
|
917 { |
|
918 TInt dcval = srcPtr[0] << PASS1_BITS; |
|
919 |
|
920 tempPtr[0 ] = dcval; |
|
921 tempPtr[4 ] = dcval; |
|
922 |
|
923 srcPtr +=1; |
|
924 tempPtr +=1; |
|
925 continue; |
|
926 } |
|
927 |
|
928 const TInt z2 = srcPtr[0 * KJpgDCTBlockWidth]; |
|
929 |
|
930 TInt tmp0 = z2 << CONST_BITS; |
|
931 |
|
932 const TInt tmp10 = tmp0; |
|
933 |
|
934 TInt z1 = tmp3; |
|
935 TInt z4 = tmp3; |
|
936 const TInt z5 = z4 * FIX_1_175875602; |
|
937 |
|
938 tmp3 = tmp3 * FIX_1_501321110; |
|
939 z1 = z1 * - FIX_0_899976223; |
|
940 z4 = z4 * - FIX_0_390180644; |
|
941 |
|
942 const TInt z3 = z5; |
|
943 z4 += z5; |
|
944 |
|
945 tmp0 = z1 + z3; |
|
946 |
|
947 tmp3 += z1 + z4; |
|
948 |
|
949 tempPtr[0 ] = DESCALE(tmp10 + tmp3, CONST_BITS - PASS1_BITS); |
|
950 tempPtr[4 ] = DESCALE(tmp10 - tmp0, CONST_BITS - PASS1_BITS); |
|
951 |
|
952 srcPtr +=1; |
|
953 tempPtr +=1; |
|
954 } while (tempPtr < tempPtrLimit); |
|
955 |
|
956 tempPtr = temp; |
|
957 tempPtrLimit= temp + KJpgDCTBlockWidth; |
|
958 |
|
959 do |
|
960 { |
|
961 TInt tmp3 = tempPtr[1]; |
|
962 |
|
963 if (tmp3 == 0) |
|
964 { |
|
965 TInt16 dcval = TInt16(DESCALE(tempPtr[0], PASS1_BITS+3) + iLevelShift); |
|
966 |
|
967 dstPtr[0] = dcval; |
|
968 dstPtr[4] = dcval; |
|
969 |
|
970 tempPtr += KScalingFactor; |
|
971 dstPtr += KScalingFactor*KJpgDCTBlockWidth; |
|
972 continue; |
|
973 } |
|
974 |
|
975 const TInt tmp10 = tempPtr[0] << CONST_BITS; |
|
976 |
|
977 TInt z4 = tmp3; |
|
978 const TInt z5 = z4 * FIX_1_175875602; |
|
979 |
|
980 const TInt z1 = tmp3 * - FIX_0_899976223; |
|
981 tmp3 = tmp3 * FIX_1_501321110; |
|
982 |
|
983 z4 = z4 * - FIX_0_390180644; |
|
984 |
|
985 const TInt z3 = z5; |
|
986 z4 += z5; |
|
987 |
|
988 const TInt tmp0 = z1 + z3; |
|
989 |
|
990 tmp3 += z1 + z4; |
|
991 |
|
992 const TInt KLevelShift = iLevelShift; |
|
993 dstPtr[0] = TInt16(DESCALE(tmp10 + tmp3,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
994 dstPtr[4] = TInt16(DESCALE(tmp10 - tmp0,CONST_BITS+PASS1_BITS+3) + KLevelShift); |
|
995 |
|
996 tempPtr += KScalingFactor; |
|
997 dstPtr += KScalingFactor*KJpgDCTBlockWidth; |
|
998 } while (tempPtr < tempPtrLimit); |
|
999 } |
|
1000 |
|
1001 // TEighthDCT |
|
1002 void TEighthDCT::InverseTransform(TDataUnit& aDestination,const TDataUnit& aSource) const |
|
1003 { |
|
1004 Fast18InvTransform(aDestination, aSource.iCoeff[0]); |
|
1005 } |
|
1006 |
|
1007 #ifdef __ARMCC__ |
|
1008 #pragma pop |
|
1009 #endif |
|
1010 |