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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 "CFilterScale.h" |
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21 #include <e32math.h> |
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22 |
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23 const TInt KScaleBits = 12; |
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24 |
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25 EXPORT_C TInt CFilterScale::Create() |
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26 { |
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27 CFilterScale* ptr = NULL; |
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28 TRAPD( error, ptr = NewL(); ); |
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29 if( error != KErrNone ) |
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30 { |
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31 ptr = NULL; |
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32 } |
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33 return (TInt)((MImageFilter*)ptr); |
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34 } |
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35 |
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36 |
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37 |
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38 CFilterScale* CFilterScale::NewL() |
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39 { |
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40 CFilterScale* self = new( ELeave )CFilterScale(); |
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41 CleanupStack::PushL( self ); |
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42 self->ConstructL(); |
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43 CleanupStack::Pop( self ); |
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44 return self; |
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45 } |
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46 |
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47 |
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48 |
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49 CFilterScale::~CFilterScale() |
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50 { |
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51 } |
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52 |
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53 |
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54 |
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55 CFilterScale::CFilterScale() |
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56 { |
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57 iScale = (1 << KScaleBits); |
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58 iRelScale = 1.0; |
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59 } |
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60 |
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61 |
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62 |
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63 void CFilterScale::ConstructL() |
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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 |
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70 TRect CFilterScale::Rect() |
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71 { |
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72 if ( iRect == TRect(0,0,0,0) ) |
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73 { |
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74 return iChild->Rect(); |
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75 } |
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76 else |
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77 { |
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78 return iRect; |
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79 } |
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80 } |
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81 |
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82 TReal CFilterScale::Scale() |
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83 { |
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84 return iRelScale; |
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85 } |
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86 |
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87 |
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88 TSize CFilterScale::ViewPortSize() |
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89 { |
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90 return iChild->ViewPortSize(); |
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91 } |
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92 |
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93 TBlock * CFilterScale::GetBlockL ( const TRect & aRect ) |
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94 { |
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95 // Get the block to be scaled |
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96 TRect rect; |
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97 rect.iTl.iX = iOrigo.iX + (((aRect.iTl.iX * iScale) >> KScaleBits)); |
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98 rect.iTl.iY = iOrigo.iY + (((aRect.iTl.iY * iScale) >> KScaleBits)); |
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99 rect.iBr.iX = iOrigo.iX + (((aRect.iBr.iX * iScale) >> KScaleBits)) + 1; |
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100 rect.iBr.iY = iOrigo.iY + (((aRect.iBr.iY * iScale) >> KScaleBits)) + 1; |
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101 |
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102 TBlock * pSource = iChild->GetBlockL(rect); |
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103 if (!pSource) return NULL; |
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104 |
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105 // Create the scaled block |
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106 TBlock * pDest = new (ELeave) TBlock (aRect); |
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107 TUint32 * pD = pDest->iData; |
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108 |
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109 rect = iChild->Rect(); |
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110 |
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111 for (TInt i = aRect.iTl.iY; i < aRect.iBr.iY; ++i) |
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112 { |
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113 |
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114 TInt y = iOrigo.iY + ((i * iScale) >> KScaleBits); |
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115 if ((y < rect.iTl.iY) || (y >= rect.iBr.iY)) |
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116 { |
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117 pD += pDest->iWidth; |
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118 continue; |
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119 } |
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120 |
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121 for (TInt j = aRect.iTl.iX; j < aRect.iBr.iX; ++j, ++pD) |
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122 { |
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123 |
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124 TInt x = iOrigo.iX + ((j * iScale) >> KScaleBits); |
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125 if ((x < rect.iTl.iX) || (x >= rect.iBr.iX)) |
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126 { |
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127 continue; |
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128 } |
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129 |
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130 if ( (x >= pSource->iRect.iTl.iX) && (x < pSource->iRect.iBr.iX) && |
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131 (y >= pSource->iRect.iTl.iY) && (y < pSource->iRect.iBr.iY) ) |
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132 { |
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133 *pD = *(pSource->iData + (y - pSource->iRect.iTl.iY) * pSource->iWidth + (x - pSource->iRect.iTl.iX)); |
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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 delete pSource; |
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139 pSource = NULL; |
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140 |
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141 // Return scaled block |
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142 return pDest; |
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143 } |
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144 |
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145 |
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146 |
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147 void CFilterScale::SetParent( MImageFilter* aParent ) |
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148 { |
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149 iParent = aParent; |
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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 void CFilterScale::SetChild( MImageFilter* aChild ) |
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155 { |
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156 iChild = aChild; |
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157 } |
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158 |
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159 |
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160 |
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161 TInt CFilterScale::CmdL( const TDesC16& aCmd ) |
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162 { |
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163 |
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164 TLex lex( aCmd ); |
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165 |
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166 while( ! lex.Eos() ) |
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167 { |
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168 TPtrC token = lex.NextToken(); |
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169 if( token.Compare( _L("zoom") ) == 0 ) |
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170 { |
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171 lex.Inc(); |
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172 lex.Val( iZoom ); |
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173 } |
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174 else if( token.Compare( _L("x") ) == 0 ) |
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175 { |
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176 lex.Inc(); |
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177 lex.Val( iPosition.iX ); |
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178 } |
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179 else if( token.Compare( _L("y") ) == 0 ) |
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180 { |
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181 lex.Inc(); |
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182 lex.Val( iPosition.iY ); |
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183 } |
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184 } |
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185 |
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186 // Get source and target sizes |
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187 TRect rect = iChild->Rect(); |
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188 TSize srcsize; |
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189 srcsize.iWidth = rect.iBr.iX - rect.iTl.iX; |
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190 srcsize.iHeight = rect.iBr.iY - rect.iTl.iY; |
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191 |
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192 rect = iParent->Rect(); |
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193 TSize tgtsize; |
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194 tgtsize.iWidth = rect.iBr.iX - rect.iTl.iX; |
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195 tgtsize.iHeight = rect.iBr.iY - rect.iTl.iY; |
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196 |
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197 // Compute aspect ratio of the source |
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198 TInt ars = (srcsize.iWidth << KScaleBits) / srcsize.iHeight; |
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199 |
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200 // Compute aspect ratio of the target |
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201 TInt art = (tgtsize.iWidth << KScaleBits) / tgtsize.iHeight; |
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202 |
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203 // Select scale so that aspect ratio is preserved |
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204 if ( ars >= art ) |
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205 { |
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206 iScale = (srcsize.iWidth << KScaleBits) / tgtsize.iWidth; |
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207 iRelScale = (TReal)tgtsize.iWidth / (TReal)srcsize.iWidth; |
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208 iOrigo.iX = iChild->Rect().iTl.iX; |
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209 TInt h = (srcsize.iWidth << KScaleBits) / art; |
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210 iOrigo.iY = iChild->Rect().iTl.iY + (srcsize.iHeight - h) / 2; |
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211 } |
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212 else |
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213 { |
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214 iScale = (srcsize.iHeight << KScaleBits) / tgtsize.iHeight; |
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215 iRelScale = (TReal)tgtsize.iHeight / (TReal)srcsize.iHeight; |
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216 iOrigo.iY = iChild->Rect().iTl.iY; |
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217 TInt w = (srcsize.iHeight * art) >> KScaleBits; |
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218 iOrigo.iX = iChild->Rect().iTl.iX + (srcsize.iWidth - w) / 2 ; |
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219 } |
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220 |
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221 rect = iChild->Rect(); |
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222 iRect.iTl.iX = ((rect.iTl.iX * iScale) >> KScaleBits); |
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223 iRect.iTl.iY = ((rect.iTl.iY * iScale) >> KScaleBits); |
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224 iRect.iBr.iX = ((rect.iBr.iX * iScale) >> KScaleBits); |
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225 iRect.iBr.iY = ((rect.iBr.iY * iScale) >> KScaleBits); |
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226 return 0; |
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227 } |
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228 |
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229 |
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230 |
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231 const char* CFilterScale::Type() |
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232 { |
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233 return "scale"; |
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234 } |
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235 |
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236 |
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237 #if !defined(EKA2) |
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238 GLDEF_C TInt E32Dll( TDllReason ) |
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239 { |
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240 return KErrNone; |
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241 } |
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242 #endif |