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1 // Copyright (c) 2003-2009 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 #include <bitmap.h> |
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18 #include "CompressionBookmark.h" |
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19 #include "BitmapCompr.h" |
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20 #include "UTILS.H" |
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21 #include "bitmapconst.h" |
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22 |
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23 GLREF_C void Panic(TFbsPanic aPanic); |
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24 |
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25 /** |
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26 The method recalculates aLineScanPos which is used for quick search of the |
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27 nearest "length" byte before aStartPos. |
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28 Note: The method should be used only for compressed in RAM bitmaps for which |
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29 iPile != NULL. |
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30 @internalComponent |
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31 @post aLineScanPos might be updated |
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32 */ |
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33 GLDEF_C void AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, |
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34 const TUint32* aBase, |
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35 TInt aBitmapWidth, |
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36 TInt aStartPos, |
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37 TInt aCompressedDataBytes) |
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38 { |
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39 TInt difference = ::Abs(aStartPos - aLineScanPos.iCursorPos); |
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40 if(difference > aBitmapWidth && aCompressedDataBytes > KCompressionBookMarkThreshold) |
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41 { |
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42 const TCompressionBookMark* bookMarkPtr = |
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43 (const TCompressionBookMark*)((const TUint8*)aBase + |
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44 (aCompressedDataBytes + 3) / 4 * 4 + 4); |
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45 if(bookMarkPtr->iSrcDataOffset && bookMarkPtr->IsCheckSumOk()) |
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46 { |
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47 TInt difference2 = ::Abs(aStartPos - bookMarkPtr->iCursorPos); |
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48 if(difference2 < difference) |
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49 { |
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50 aLineScanPos.iCursorPos = bookMarkPtr->iCursorPos; |
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51 aLineScanPos.iSrcDataPtr = ((TUint8*)aBase) + bookMarkPtr->iSrcDataOffset; |
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52 } |
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53 } |
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54 } |
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55 } |
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56 |
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57 /** |
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58 The method gets the first 16 bpp pixel value pointed by aSrcPtr and copies it aCount times |
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59 to aDestPtr buffer. |
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60 @internalComponent |
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61 @pre aCount > 0 |
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62 @param aSrcPtr It points to the source pixel |
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63 @param aDestPtr It points to the destination buffer where the pixel should be copied aCount times |
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64 @param aCount How many times the pixel value should be copied |
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65 @return The updated aDestPtr |
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66 */ |
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67 template <> |
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68 TUint8* TScanLineDecompressor<E2bpp, E2bpp>::CopyPixel(TUint8* aDestPtr, |
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69 const TUint8* aSrcPtr, |
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70 TInt aCount) const |
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71 { |
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72 //We can't access directly the 16 bits data chunk, because it may be located at an odd address and |
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73 //THUMB build will fail with "KERNEL EXEC-3". |
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74 TUint8 lsb = *aSrcPtr; |
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75 TUint8 msb = *(aSrcPtr + 1); |
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76 TUint16 data = TUint16(lsb | (TUint16(msb) << 8)); |
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77 TUint32 data32 = TUint32(data | (TUint32(data) << 16)); |
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78 if((TUint32(aDestPtr) & 0x2) && aCount) |
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79 { |
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80 *(TUint16*)aDestPtr = data; |
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81 aDestPtr += 2;//+= 2 - the pixel color is coded into 16 bits - 2 bytes |
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82 aCount--; |
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83 } |
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84 while(aCount > 1) |
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85 { |
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86 *(TUint32*)aDestPtr = data32; |
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87 aDestPtr += 4;//+= 4 - the pixel color is coded into 16 bits - 2 x 2 bytes |
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88 aCount -= 2; |
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89 } |
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90 if(aCount) |
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91 { |
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92 *(TUint16*)aDestPtr = data; |
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93 aDestPtr += 2;//+= 2 - the pixel color is coded into 16 bits - 2 bytes |
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94 } |
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95 return aDestPtr; |
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96 } |
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97 |
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98 /** |
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99 The method gets the first 24 bpp pixel value pointed by aSrcPtr and copies it aCount times |
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100 to aDestPtr buffer. |
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101 @internalComponent |
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102 @pre aCount > 0 |
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103 @param aSrcPtr It points to the source pixel |
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104 @param aDestPtr It points to the destination buffer where the pixel should be copied aCount times |
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105 @param aCount How many times the pixel value should be copied |
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106 @return The updated aDestPtr |
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107 */ |
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108 template <> |
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109 TUint8* TScanLineDecompressor<E3bpp, E3bpp>::CopyPixel(TUint8* aDestPtr, |
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110 const TUint8* aSrcPtr, |
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111 TInt aCount) const |
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112 { |
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113 const TUint8 b1 = *aSrcPtr; |
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114 const TUint8 b2 = *(aSrcPtr + 1); |
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115 const TUint8 b3 = *(aSrcPtr + 2); |
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116 while(aCount--) |
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117 { |
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118 *aDestPtr++ = b1; |
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119 *aDestPtr++ = b2; |
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120 *aDestPtr++ = b3; |
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121 } |
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122 return aDestPtr; |
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123 } |
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124 |
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125 /** |
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126 The method gets the first 32 bpp pixel value pointed by aSrcPtr and copies it aCount times |
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127 to aDestPtr buffer. |
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128 @internalComponent |
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129 @pre aCount > 0 |
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130 @param aSrcPtr It points to the source pixel |
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131 @param aDestPtr It points to the destination buffer where the pixel should be copied aCount times |
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132 @param aCount How many times the pixel value should be copied |
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133 @return The updated aDestPtr |
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134 */ |
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135 template <> |
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136 TUint8* TScanLineDecompressor<E4bpp, E4bpp>::CopyPixel(TUint8* aDestPtr, |
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137 const TUint8* aSrcPtr, |
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138 TInt aCount) const |
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139 { |
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140 __ASSERT_DEBUG((reinterpret_cast<TUint32>(aDestPtr) & 0x3)==0,Panic(EFbsBitmapDecompressionError)); // make sure the start address is word aligned |
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141 |
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142 const TUint8 b1 = *aSrcPtr; |
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143 const TUint8 b2 = *(aSrcPtr + 1); |
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144 const TUint8 b3 = *(aSrcPtr + 2); |
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145 const TUint8 b4 = *(aSrcPtr + 3); |
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146 |
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147 if((reinterpret_cast<TUint32>(aDestPtr) & 0x3)== 0) // the start address is word aligned |
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148 { |
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149 const TUint32 pixel = (b4 << 24) | (b3 << 16) | (b2 << 8) | b1; |
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150 TUint32* destPtr32 = reinterpret_cast <TUint32*>(aDestPtr); |
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151 TInt blocksOf16 = ((aCount + 0x0f) >> 4); // number of blocks of upto 16 words to write |
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152 // the first iteration writes 1 to 15 words |
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153 switch (aCount & 0x0f) |
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154 { // note that case statements intentionally cascade |
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155 case 0: |
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156 do { // second and subsequent iterations always write 16 words |
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157 *destPtr32++ = pixel; |
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158 case 15: |
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159 *destPtr32++ = pixel; |
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160 case 14: |
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161 *destPtr32++ = pixel; |
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162 case 13: |
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163 *destPtr32++ = pixel; |
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164 case 12: |
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165 *destPtr32++ = pixel; |
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166 case 11: |
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167 *destPtr32++ = pixel; |
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168 case 10: |
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169 *destPtr32++ = pixel; |
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170 case 9: |
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171 *destPtr32++ = pixel; |
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172 case 8: |
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173 *destPtr32++ = pixel; |
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174 case 7: |
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175 *destPtr32++ = pixel; |
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176 case 6: |
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177 *destPtr32++ = pixel; |
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178 case 5: |
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179 *destPtr32++ = pixel; |
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180 case 4: |
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181 *destPtr32++ = pixel; |
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182 case 3: |
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183 *destPtr32++ = pixel; |
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184 case 2: |
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185 *destPtr32++ = pixel; |
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186 case 1: |
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187 *destPtr32++ = pixel; |
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188 } while(--blocksOf16 > 0); |
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189 } |
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190 |
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191 return reinterpret_cast <TUint8*>(destPtr32); |
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192 } |
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193 |
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194 while(aCount--) |
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195 { |
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196 *aDestPtr++ = b1; |
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197 *aDestPtr++ = b2; |
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198 *aDestPtr++ = b3; |
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199 *aDestPtr++ = b4; |
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200 } |
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201 return aDestPtr; |
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202 } |
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203 |
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204 /** |
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205 The method gets the first 24 bpp pixel value pointed by aSrcPtr and copies it aCount times |
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206 to aDestPtr 32 bpp buffer. |
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207 @internalComponent |
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208 @pre aCount > 0 |
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209 @param aSrcPtr It points to the source pixel |
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210 @param aDestPtr It points to the destination buffer where the pixel should be copied aCount times |
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211 @param aCount How many times the pixel value should be copied |
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212 @return The updated aDestPtr |
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213 */ |
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214 template <> |
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215 TUint8* TScanLineDecompressor<E3bpp, E4bpp>::CopyPixel(TUint8* aDestPtr, |
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216 const TUint8* aSrcPtr, |
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217 TInt aCount) const |
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218 { |
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219 const TUint8 b1 = *aSrcPtr; |
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220 const TUint8 b2 = *(aSrcPtr + 1); |
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221 const TUint8 b3 = *(aSrcPtr + 2); |
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222 |
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223 if((reinterpret_cast<TUint32>(aDestPtr) & 0x3)== 0) // the start address is word aligned |
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224 { |
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225 const TUint32 pixel = 0xFF000000 | (b3 << 16) | (b2 << 8) | b1; //it is more accurate to equalize to 0xff, |
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226 //as top byte could correspond an alpha channel |
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227 TUint32* destPtr32 = reinterpret_cast <TUint32*>(aDestPtr); |
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228 TInt blocksOf16 = ((aCount + 0x0f) >> 4); // number of blocks of upto 16 words to write |
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229 // the first iteration writes 1 to 15 words |
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230 switch (aCount & 0x0f) |
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231 { // note that case statements intentionally cascade |
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232 case 0: |
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233 do { // second and subsequent iterations always write 16 words |
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234 *destPtr32++ = pixel; |
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235 case 15: |
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236 *destPtr32++ = pixel; |
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237 case 14: |
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238 *destPtr32++ = pixel; |
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239 case 13: |
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240 *destPtr32++ = pixel; |
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241 case 12: |
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242 *destPtr32++ = pixel; |
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243 case 11: |
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244 *destPtr32++ = pixel; |
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245 case 10: |
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246 *destPtr32++ = pixel; |
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247 case 9: |
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248 *destPtr32++ = pixel; |
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249 case 8: |
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250 *destPtr32++ = pixel; |
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251 case 7: |
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252 *destPtr32++ = pixel; |
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253 case 6: |
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254 *destPtr32++ = pixel; |
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255 case 5: |
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256 *destPtr32++ = pixel; |
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257 case 4: |
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258 *destPtr32++ = pixel; |
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259 case 3: |
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260 *destPtr32++ = pixel; |
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261 case 2: |
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262 *destPtr32++ = pixel; |
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263 case 1: |
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264 *destPtr32++ = pixel; |
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265 } while(--blocksOf16 > 0); |
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266 } |
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267 |
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268 return reinterpret_cast <TUint8*>(destPtr32); |
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269 } |
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270 |
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271 while(aCount--) |
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272 { |
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273 *aDestPtr++ = b1; |
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274 *aDestPtr++ = b2; |
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275 *aDestPtr++ = b3; |
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276 *aDestPtr++ = 0xff; //it is more accurate to equalize to 0xff, as top byte |
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277 //could correspond an alpha channel |
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278 } |
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279 return aDestPtr; |
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280 } |
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281 |
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282 /** |
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283 The method gets the 24 bpp pixel value pointed by aSrcPtr and copies it aCount times |
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284 to aDestPtr 32 bpp buffer. |
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285 @internalComponent |
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286 @pre aCount > 0 |
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287 @param aSrcPtr It points to the source pixel |
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288 @param aDestPtr It points to the destination buffer where the pixel should be copied aCount times |
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289 @param aCount How many times the pixel value should be copied |
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290 @return The updated aDestPtr |
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291 */ |
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292 template <> |
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293 TUint8* TScanLineDecompressor<E3bpp, E4bpp>::CopyBlockPixel(TUint8* aDestPtr, |
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294 const TUint8* aSrcPtr, |
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295 TInt aCount) const |
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296 { |
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297 while(aCount--) |
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298 { |
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299 *aDestPtr++ = *aSrcPtr++; |
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300 *aDestPtr++ = *aSrcPtr++; |
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301 *aDestPtr++ = *aSrcPtr++; |
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302 *aDestPtr++ = 0xff; //it is more accurate to equalize to 0xff, as top byte |
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303 //could correspond an alpha channel |
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304 } |
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305 return aDestPtr; |
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306 } |
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307 |
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308 /** |
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309 The method should never be executed. |
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310 Introduced to prevent CCover compiler from failing. |
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311 @internalComponent |
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312 @return The unchanged aDestPtr |
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313 */ |
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314 template <> |
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315 TUint8* TScanLineDecompressor<E2bpp, E2bpp>::CopyBlockPixel(TUint8* aDestPtr, |
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316 const TUint8* /*aSrcPtr*/, |
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317 TInt /*aCount*/) const |
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318 { |
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319 return aDestPtr; |
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320 } |
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321 |
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322 /** |
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323 The method should never be executed. |
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324 Introduced to prevent CCover compiler from failing. |
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325 @internalComponent |
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326 @return The unchanged aDestPtr |
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327 */ |
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328 template <> |
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329 TUint8* TScanLineDecompressor<E3bpp, E3bpp>::CopyBlockPixel(TUint8* aDestPtr, |
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330 const TUint8* /*aSrcPtr*/, |
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331 TInt /*aCount*/) const |
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332 { |
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333 return aDestPtr; |
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334 } |
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335 |
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336 /** |
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337 The method should never be executed. |
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338 Introduced to prevent CCover compiler from failing. |
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339 @internalComponent |
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340 @return The unchanged aDestPtr |
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341 */ |
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342 template <> |
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343 TUint8* TScanLineDecompressor<E4bpp, E4bpp>::CopyBlockPixel(TUint8* aDestPtr, |
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344 const TUint8* /*aSrcPtr*/, |
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345 TInt /*aCount*/) const |
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346 { |
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347 return aDestPtr; |
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348 } |