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 //----IMAAMI---- |
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21 //************************************************************************* |
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22 //DCDithering.cpp |
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23 // |
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24 //Version 1.00 |
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25 // |
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26 //Contains: |
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27 // CDCDithering |
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28 // |
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29 //History: |
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30 // 19.08.2003 version 1.00 created using existing IMAAMI algorithms |
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31 //************************************************************************* |
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32 |
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33 // Include Files |
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34 #include <e32std.h> // The basic definitions |
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35 #include <fbs.h> // For FBS bitmap |
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36 #include "DCDithering.h" // The DCDithering class |
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37 |
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38 |
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39 |
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40 // MEMBER FUNCTIONS |
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41 //============================================================================= |
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42 |
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43 |
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44 |
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45 /* |
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46 ----------------------------------------------------------------------------- |
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47 |
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48 CDCDithering |
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49 |
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50 Constructor |
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51 |
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52 Default constructor |
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53 |
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54 Return Values: none |
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55 |
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56 ----------------------------------------------------------------------------- |
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57 */ |
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58 CDCDithering::CDCDithering() |
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59 { |
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60 // This function is intentionally left blank. |
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61 } |
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62 |
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63 |
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64 |
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65 |
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66 /* |
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67 ----------------------------------------------------------------------------- |
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68 |
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69 CDCDithering |
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70 |
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71 NewLC |
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72 |
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73 Factory function to instantiate the class. |
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74 This function leaves the class pointer to the cleanup stack |
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75 May leave with KErrNoMemory if no memory available |
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76 |
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77 Return Values: CDCDithering* self: pointer to the class instance |
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78 |
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79 ----------------------------------------------------------------------------- |
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80 */ |
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81 CDCDithering* CDCDithering::NewLC() |
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82 { |
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83 CDCDithering* self = new (ELeave) CDCDithering(); |
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84 CleanupStack::PushL(self); |
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85 self->ConstructL(); |
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86 return self; |
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87 } |
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88 |
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89 |
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90 |
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91 |
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92 /* |
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93 ----------------------------------------------------------------------------- |
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94 |
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95 CDCDithering |
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96 |
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97 NewL |
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98 |
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99 Factory function to instantiate the class. |
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100 May leave with KErrNoMemory if no memory available |
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101 |
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102 Return Values: CDCDithering* self: pointer to the class instance |
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103 |
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104 ----------------------------------------------------------------------------- |
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105 */ |
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106 CDCDithering* CDCDithering::NewL() |
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107 { |
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108 CDCDithering* self = CDCDithering::NewLC(); |
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109 CleanupStack::Pop(); |
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110 return self; |
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111 } |
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112 |
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113 |
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114 |
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115 /* |
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116 ----------------------------------------------------------------------------- |
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117 |
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118 CDCDithering |
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119 |
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120 ConstructL |
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121 |
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122 Second phase constructor. Does nothing at the moment |
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123 |
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124 Return Values: none |
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125 |
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126 ----------------------------------------------------------------------------- |
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127 */ |
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128 void CDCDithering::ConstructL() |
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129 { |
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130 // This function is intentionally left blank. |
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131 } |
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132 |
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133 |
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134 |
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135 |
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136 /* |
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137 ----------------------------------------------------------------------------- |
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138 |
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139 CDCDithering |
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140 |
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141 Destructor |
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142 |
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143 Return Values: none |
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144 |
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145 ----------------------------------------------------------------------------- |
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146 */ |
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147 CDCDithering::~CDCDithering() |
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148 { |
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149 // This function is intentionally left blank. |
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150 } |
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151 |
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152 |
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153 |
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154 /* |
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155 ----------------------------------------------------------------------------- |
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156 |
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157 ProcessL |
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158 |
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159 Process image referenced by aImage (modify aImage). |
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160 May leave with KErrNoMemory if no memory available |
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161 |
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162 Return Values: none |
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163 |
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164 ----------------------------------------------------------------------------- |
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165 */ |
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166 void CDCDithering::ProcessL(CFbsBitmap& aImage) |
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167 { |
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168 TUint r, g, b; // Color components |
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169 TUint8* dataPtr; // Pointer to data |
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170 |
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171 //Dithering variables, init to 0 |
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172 TInt count=0; |
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173 TInt16 dither=0; |
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174 |
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175 //EColor16M image is needed |
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176 if (aImage.DisplayMode() != EColor16M || aImage.DisplayMode() != EColor16M) |
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177 return; |
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178 |
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179 // Line Buffer and pointer to the data |
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180 TUint imageWidth = aImage.SizeInPixels().iWidth; |
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181 TUint scanLineLengthInBytes = aImage.ScanLineLength(imageWidth, aImage.DisplayMode()); |
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182 |
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183 //Allocate buffer for scanline |
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184 iScanLineBuffer = HBufC8::NewMaxL(scanLineLengthInBytes); |
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185 //Pointer to scanline |
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186 TPtr8 linePtr = iScanLineBuffer->Des(); |
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187 |
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188 //Step through image lines |
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189 for (TInt lineNo=0; lineNo<aImage.SizeInPixels().iHeight; ++lineNo) |
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190 { |
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191 //Get line |
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192 aImage.GetScanLine(linePtr, TPoint(0, lineNo), imageWidth, aImage.DisplayMode()); |
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193 //CHECK! CONST_CAST not used in every algorithm which way is better? |
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194 dataPtr = CONST_CAST(TUint8*, linePtr.Ptr()); |
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195 |
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196 //Step through image pixels |
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197 for (TUint x=0; x < imageWidth; ++x) |
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198 { |
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199 // Get original values |
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200 b = *dataPtr++; |
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201 g = *dataPtr++; |
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202 r = *dataPtr++; |
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203 |
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204 //Compute DCDithering factor from base count |
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205 switch (count&1) |
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206 { |
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207 case 0: |
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208 dither = (TInt16)(dither*0x7ffd); |
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209 break; |
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210 case 1: |
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211 dither = (TInt16)(dither+0x7f21); |
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212 break; |
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213 } |
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214 |
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215 //Add DCDithering factor, adjust gain according to quantization factors. |
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216 r = Limit255((TInt)r + (dither>>13)); |
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217 g = Limit255((TInt)g - (dither>>14)); |
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218 b = Limit255((TInt)b + (dither>>13)); |
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219 |
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220 //Move to the previous pixel |
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221 dataPtr -= 3; |
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222 |
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223 /* Set the result */ |
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224 *dataPtr++ = (TUint8)b; |
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225 *dataPtr++ = (TUint8)g; |
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226 *dataPtr++ = (TUint8)r; |
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227 |
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228 //Increase bae count |
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229 count++; |
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230 } |
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231 |
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232 //Set scan line |
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233 aImage.SetScanLine(linePtr, lineNo); |
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234 } |
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235 |
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236 //Free allocated memory |
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237 delete(iScanLineBuffer); |
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238 iScanLineBuffer = 0; |
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239 } |
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240 // End of File |
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241 //----IMAAMI---- |
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