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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 #include <e32math.h> |
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21 #include "CFilterContrast.h" |
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22 |
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23 EXPORT_C TInt CFilterContrast::Create() |
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24 { |
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25 CFilterContrast* ptr = NULL; |
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26 TRAPD( error, ptr = NewL(); ); |
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27 if( error != KErrNone ) |
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28 { |
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29 ptr = NULL; |
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30 } |
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31 return (TInt)((MImageFilter*)ptr); |
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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 CFilterContrast* CFilterContrast::NewL() |
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37 { |
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38 CFilterContrast* self = new( ELeave )CFilterContrast(); |
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39 CleanupStack::PushL( self ); |
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40 self->ConstructL(); |
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41 CleanupStack::Pop( self ); |
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42 return self; |
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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 CFilterContrast::~CFilterContrast() |
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48 { |
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49 } |
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50 |
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51 |
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52 |
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53 CFilterContrast::CFilterContrast() |
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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 |
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59 |
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60 void CFilterContrast::ConstructL() |
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61 { |
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62 ComputeContrastStretchL(); |
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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 TRect CFilterContrast::Rect() |
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68 { |
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69 return iChild->Rect(); |
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70 } |
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71 |
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72 TReal CFilterContrast::Scale() |
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73 { |
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74 return iChild->Scale(); |
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75 } |
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76 |
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77 TSize CFilterContrast::ViewPortSize() |
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78 { |
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79 return iChild->ViewPortSize(); |
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80 } |
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81 |
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82 |
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83 TBlock * CFilterContrast::GetBlockL ( const TRect & aRect ) |
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84 { |
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85 TBlock * pB = iChild->GetBlockL (aRect); |
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86 if (!pB) return NULL; |
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87 TUint32 * pD = pB->iData; |
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88 for (TInt i = 0; i < pB->iDataLength; ++i) |
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89 { |
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90 TUint32 c = *pD; |
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91 TUint8 b = iLUT[c & 0xFF]; |
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92 c >>= 8; |
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93 TUint8 g = iLUT[c & 0xFF]; |
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94 c >>= 8; |
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95 TUint8 r = iLUT[c & 0xFF]; |
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96 *pD++ = 0 | b | (g << 8) | (r << 16); |
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97 } |
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98 return pB; |
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99 } |
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100 |
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101 |
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102 |
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103 void CFilterContrast::SetParent( MImageFilter* aParent ) |
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104 { |
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105 iParent = aParent; |
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106 } |
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107 |
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108 |
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109 |
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110 |
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111 void CFilterContrast::SetChild( MImageFilter* aChild ) |
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112 { |
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113 iChild = aChild; |
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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 TInt CFilterContrast::CmdL( const TDesC16& aCmd ) |
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119 { |
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120 |
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121 TLex lex (aCmd); |
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122 |
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123 while ( ! lex.Eos() ) |
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124 { |
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125 TPtrC token = lex.NextToken(); |
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126 |
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127 if ( token.Compare( _L("contrast") ) == 0) |
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128 { |
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129 |
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130 lex.Inc(); |
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131 lex.Val (iContrast); |
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132 |
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133 // Check parameter |
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134 if ( iContrast < -100) |
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135 { |
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136 iContrast = -100; |
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137 } |
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138 else if ( iContrast > 100) |
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139 { |
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140 iContrast = 100; |
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141 } |
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142 ComputeContrastStretchL(); |
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143 } |
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144 } |
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145 return 0; |
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146 } |
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147 |
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148 const char* CFilterContrast::Type() |
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149 { |
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150 return "contrast"; |
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151 } |
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152 |
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153 void CFilterContrast::ComputeContrastStretchL() |
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154 { |
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155 // Compute luminance histogram, if not computed |
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156 if ( iContrast >= 0 ) |
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157 { |
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158 TInt val_low = (iContrast * 127) / 100; |
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159 TInt val_high = 255 - val_low; |
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160 TInt range = val_high - val_low + 1; |
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161 |
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162 TInt i = 0; |
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163 for ( ; i <= val_low; i++) |
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164 { |
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165 iLUT[i] = 0; |
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166 } |
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167 for ( ; i < val_high; ++i) |
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168 { |
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169 iLUT[i] = (TUint8)(((i - val_low) * 255) / range); |
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170 } |
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171 for ( ; i <= 255; i++) |
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172 { |
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173 iLUT[i] = 255; |
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174 } |
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175 } |
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176 else |
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177 { |
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178 |
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179 TInt val_low = (-iContrast * 127) / 100; |
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180 TInt val_high = 255 - val_low; |
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181 TInt range = val_high - val_low + 1; |
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182 |
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183 for ( TInt i = 0; i <= 255; i++ ) |
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184 { |
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185 iLUT[i] = (TUint8)(val_low + (i * range) / 255); |
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186 } |
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187 } |
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188 } |
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189 |
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190 #if !defined(EKA2) |
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191 GLDEF_C TInt E32Dll( TDllReason ) |
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192 { |
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193 return KErrNone; |
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194 } |
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195 #endif |