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1 /* |
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2 * Copyright (c) 2010 Ixonos Plc. |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - Initial contribution |
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11 * |
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12 * Contributors: |
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13 * Ixonos Plc |
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14 * |
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15 * Description: |
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16 * |
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17 */ |
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18 |
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19 |
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20 // |
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21 // Jpeg decoder class |
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22 |
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23 #ifndef __CJPEG_H__ |
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24 #define __CJPEG_H__ |
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25 |
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26 #include <e32base.h> |
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27 #include <f32file.h> |
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28 #include "TBitmapHandle.h" |
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29 #include "MJpegLoad.h" |
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30 |
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31 class THuffman; |
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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 /// Main Jpeg decode class |
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37 class CJpeg |
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38 : public CBase |
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39 , public MJpegLoad |
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40 { |
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41 |
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42 public: |
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43 static CJpeg* NewL(); |
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44 static CJpeg* NewLC(); |
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45 ~CJpeg(); |
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46 |
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47 private: |
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48 CJpeg(); |
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49 void ConstructL(); |
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50 |
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51 public: // MJpegLoad |
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52 |
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53 void OpenL( const TFileName& aFile ); |
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54 void OpenL( const TPtr8& aData ); |
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55 |
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56 void SetScale( TJpegScale aScale ); |
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57 TBitmapHandle LoadImageL( TRect& aRect ); |
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58 |
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59 void ScanRandomL(); // scans file, creates random access tables |
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60 TBitmapHandle LoadBlockL( const TPoint& aBlock ); |
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61 |
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62 const TJpegData& Info(); |
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63 TPtrC8 ExifData(); |
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64 |
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65 public: |
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66 |
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67 void EnableRgvConv(); |
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68 void DisableRgbConv(); |
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69 |
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70 private: |
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71 inline void BufFwd( TInt aBits ); |
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72 inline TInt BufBits( TInt aBits ); |
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73 inline TInt Buf16(); |
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74 inline void BufLoad8(); |
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75 void DecodeBlock(); |
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76 void DecodeBlock2(); |
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77 void DecodeBlock3(); |
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78 void Idct(); |
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79 void IdctHalf(); |
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80 void CreateHuffmanL( THuffman* aHuffman, const TUint8* aBits, const TUint8* aVal ); |
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81 void CreateDefaultHuffmanL(); |
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82 void PrepareLoadBlockL(); // must be called before first LoadBlock() |
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83 |
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84 // |
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85 // Scale load functions: |
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86 // |
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87 void DecRgb1_1L( const TBitmapHandle& aBitmap, const TRect& aBlockRect ); |
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88 void DecRgb1_2L( const TBitmapHandle& aBitmap, const TRect& aBlockRect ); |
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89 void DecRgb1_4L( const TBitmapHandle& aBitmap, const TRect& aBlockRect ); |
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90 void DecRgb1_8L( const TBitmapHandle& aBitmap, const TRect& aBlockRect ); |
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91 |
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92 // |
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93 // Yuv -> Rgb functions |
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94 // |
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95 |
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96 // YUV420 |
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97 static void Yuv2Rgb22_11_11( TAny* aPtr ); |
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98 |
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99 // YUV422 |
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100 static void Yuv2Rgb21_11_11( TAny* aPtr ); |
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101 |
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102 // Any other YUV format |
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103 static void Yuv2RgbFree( TAny* aPtr ); |
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104 |
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105 private: |
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106 |
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107 /// Jpeg component information struct |
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108 /// one for each color component |
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109 class TComponent |
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110 { |
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111 public: |
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112 char iType; |
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113 char iXFactor; |
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114 char iYFactor; |
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115 char iQuantTable; |
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116 char iID; |
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117 }; |
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118 |
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119 /// Current jpeg block search / use struct |
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120 /// will change to type where the actual huffman data is also contained |
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121 class TJpegBlock |
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122 { |
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123 public: |
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124 TUint32 iOffset; |
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125 TUint32 iBuf; |
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126 TInt iBufBits; |
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127 TInt iY; |
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128 TInt iU; |
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129 TInt iV; |
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130 }; |
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131 |
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132 class TYuvConv |
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133 { |
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134 public: |
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135 TUint32* iRgb; |
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136 TSize iBlkSize; |
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137 TInt iRgbWidth; |
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138 TInt iBlkPixels; |
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139 }; |
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140 |
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141 TUint8* iBuffer; // contains whole jpeg file now |
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142 TInt iBufPos; |
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143 |
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144 TUint32 iBuf; // Huffman bit buffer |
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145 TInt iBufBits; // number of bits in bitbuffer |
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146 |
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147 THuffman* iHuffman[ 4 ]; // huffman lookup tables |
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148 TInt iCurrentHuffman; |
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149 |
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150 TUint8* iQt[ 4 ]; // Quantization tables |
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151 TUint8* iCurrentQt; |
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152 |
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153 TInt iDct[ 64 ]; // DCT coefficients |
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154 TInt iBlk[ 64 ]; // IDCT result |
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155 |
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156 TBool iRst; // RST flag, might occur on some jpegs |
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157 |
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158 bool iEOF; |
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159 |
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160 TJpegData iData; |
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161 |
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162 TComponent iComponent[ 4 ]; |
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163 TInt iNumComponents; |
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164 |
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165 //RArray< TJpegBlock >iBlock; |
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166 TJpegBlock* iBlock; |
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167 TInt iNumBlocks; |
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168 |
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169 TUint8* iExifData; |
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170 TInt iExifDataLength; |
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171 |
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172 // LoadBlock variables: |
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173 TBitmapHandle iBm; // rgb block bitmap |
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174 TInt iBlkPixels; // number of pixels in rgb block |
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175 |
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176 TUint8* iC[ 3 ]; // Y,U,V buffer |
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177 |
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178 TInt iYxa; |
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179 TInt iYya; |
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180 TInt iUxa; |
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181 TInt iUya; |
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182 TInt iVxa; |
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183 TInt iVya; |
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184 |
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185 bool iRgbConv; |
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186 |
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187 //RFs iFs; |
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188 //RFile iDebug; |
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189 |
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190 TYuvConv iYuvConv; |
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191 void (*iYuv2rgbFunc)(TAny*); |
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192 |
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193 |
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194 TInt iImageDataStart; |
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195 bool iRandomScanned; |
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196 bool iLoadBlockPrepared; |
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197 |
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198 TJpegScale iScale; |
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199 |
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200 TInt iResetInterval; |
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201 |
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202 |
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203 }; |
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204 |
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205 |
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206 inline void CJpeg::BufFwd( TInt aBits ) |
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207 { |
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208 iBuf <<= aBits; |
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209 iBufBits -= aBits; |
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210 } |
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211 |
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212 |
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213 |
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214 inline TInt CJpeg::BufBits( TInt aBits ) |
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215 { |
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216 if( aBits == 0 ) return 0; |
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217 while( iBufBits < aBits ) |
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218 { |
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219 BufLoad8(); |
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220 } |
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221 TInt val = iBuf >> ( 32-aBits ); |
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222 BufFwd( aBits ); |
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223 return val; |
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224 } |
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225 |
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226 |
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227 |
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228 inline TInt CJpeg::Buf16() |
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229 { |
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230 while( iBufBits < 16 ) |
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231 { |
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232 BufLoad8(); |
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233 } |
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234 TInt val = iBuf >> ( 32-16 ); |
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235 return val; |
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236 } |
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237 |
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238 |
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239 |
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240 inline void CJpeg::BufLoad8() |
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241 { |
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242 TInt v; |
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243 v = iBuffer[ iBufPos++ ]; |
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244 if( v == 255 ) |
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245 { |
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246 v = iBuffer[ iBufPos++ ]; // escaped 0xff ? |
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247 if( v == 0 ) |
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248 { |
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249 v = 255; |
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250 } |
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251 else |
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252 { |
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253 //RDebug::Print( _L("Discard %x - position=%d bits=%d"), v, iBufPos, iBufBits ); |
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254 // here we have probably discarded a RST0..7 |
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255 iRst = ETrue; // inform decoder of reset |
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256 iBufBits = 255; // decoder doesn't need any more real data until next mcu |
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257 return; |
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258 } |
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259 } |
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260 |
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261 v <<= ( 24 - iBufBits ); |
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262 iBuf |= v; |
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263 iBufBits += 8; |
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264 } |
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265 |
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266 |
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267 |
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268 |
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269 #endif |