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1 /* |
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2 * Copyright (c) 2007-2010 Sebastian Brannstrom, Lars Persson, EmbedDev AB |
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3 * |
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4 * All rights reserved. |
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5 * This component and the accompanying materials are made available |
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6 * under the terms of the License "Eclipse Public License v1.0" |
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7 * which accompanies this distribution, and is available |
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8 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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9 * |
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10 * Initial Contributors: |
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11 * EmbedDev AB - initial contribution. |
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12 * |
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13 * Contributors: |
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14 * Example code from OcrExample Copyright (c) 2006 Nokia Corporation. |
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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 #include "ImageHandler.h" |
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20 |
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21 // ============================================================================= |
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22 // CImageHandler, a utility class for loading images. |
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23 // ============================================================================= |
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24 |
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25 // ============================= MEMBER FUNCTIONS =============================== |
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26 |
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27 // ----------------------------------------------------------------------------- |
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28 // CImageHandler::CImageHandler |
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29 // C++ constructor can NOT contain any code, that |
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30 // might leave. |
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31 // ----------------------------------------------------------------------------- |
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32 // |
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33 CImageHandler::CImageHandler( RFs& aFs ) |
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34 : CActive(CActive::EPriorityStandard) |
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35 , iDecoder(NULL) |
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36 , iScaler(NULL) |
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37 , iFs(aFs) |
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38 , iSize(0,0) |
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39 { |
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40 } |
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41 |
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42 // ----------------------------------------------------------------------------- |
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43 // CImageHandler::ConstructL |
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44 // Symbian 2nd phase constructor can leave. |
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45 // ----------------------------------------------------------------------------- |
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46 // |
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47 void CImageHandler::ConstructL() |
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48 { |
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49 CActiveScheduler::Add(this); |
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50 iBitmap = new (ELeave) CFbsBitmap; |
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51 } |
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52 |
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53 // ----------------------------------------------------------------------------- |
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54 // CImageHandler::NewLC |
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55 // Two-phased constructor. |
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56 // ----------------------------------------------------------------------------- |
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57 // |
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58 EXPORT_C CImageHandler* CImageHandler::NewL(RFs& aFs) |
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59 { |
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60 CImageHandler* self = NewLC(aFs); |
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61 CleanupStack::Pop(); |
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62 return self; |
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63 } |
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64 |
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65 // ----------------------------------------------------------------------------- |
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66 // CImageHandler::NewLC |
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67 // Two-phased constructor. |
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68 // ----------------------------------------------------------------------------- |
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69 // |
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70 EXPORT_C CImageHandler* CImageHandler::NewLC(RFs& aFs) |
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71 { |
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72 CImageHandler* self = new (ELeave) CImageHandler(aFs); |
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73 CleanupStack::PushL( self ); |
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74 self->ConstructL(); |
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75 |
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76 return self; |
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77 } |
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78 |
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79 // Destructor |
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80 EXPORT_C CImageHandler::~CImageHandler() |
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81 { |
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82 // Cancel any outstanding request |
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83 Cancel(); |
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84 Deque(); |
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85 delete iDecoder; |
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86 delete iScaler; |
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87 delete iBitmap; |
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88 iCallbackQue.Close(); |
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89 } |
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90 |
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91 // ----------------------------------------------------------------------------- |
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92 // CImageHandler::LoadFileL |
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93 // Loads a selected frame from a named file |
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94 // ----------------------------------------------------------------------------- |
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95 // |
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96 void CImageHandler::LoadFileL(const TFileName& aFileName, TInt aSelectedFrame) |
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97 { |
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98 __ASSERT_ALWAYS(!IsActive(),User::Invariant()); |
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99 if ( iDecoder ) |
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100 { |
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101 delete iDecoder; |
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102 iDecoder = NULL; |
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103 } |
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104 |
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105 iDecoder = CImageDecoder::FileNewL(iFs, aFileName); |
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106 // Get image information |
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107 iFrameInfo = iDecoder->FrameInfo(aSelectedFrame); |
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108 // Resize to fit. |
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109 TRect bitmap = iFrameInfo.iFrameCoordsInPixels; |
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110 |
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111 // release possible previous image |
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112 iBitmap->Reset(); |
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113 iBitmap->Create(bitmap.Size(), EColor16M); |
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114 |
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115 // Decode as bitmap. |
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116 iDecoder->Convert(&iStatus, *iBitmap, aSelectedFrame); |
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117 SetActive(); |
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118 } |
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119 |
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120 EXPORT_C void CImageHandler::LoadFileAndScaleL(CFbsBitmap* aScaledBitmap, |
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121 const TFileName& aFileName, |
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122 const TSize &aSize, |
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123 MImageHandlerCallback& aCallback, |
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124 TInt aSelectedFrame) |
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125 { |
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126 if(!IsActive()) |
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127 { |
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128 __ASSERT_ALWAYS(!IsActive(),User::Invariant()); |
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129 iSize = aSize; |
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130 iScaledBitmap = aScaledBitmap; |
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131 iScaledBitmap->Reset(); |
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132 iScaledBitmap->Create(aSize, EColor16M); |
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133 iCallback = &aCallback; |
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134 LoadFileL(aFileName, aSelectedFrame); |
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135 } |
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136 else |
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137 { |
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138 TImageStruct imageStruct; |
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139 imageStruct.iCallBack = &aCallback; |
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140 imageStruct.iScaledImage = aScaledBitmap; |
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141 imageStruct.iScaledSize = aSize; |
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142 imageStruct.iFileName = aFileName; |
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143 iCallbackQue.Append(imageStruct); |
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144 } |
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145 } |
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146 |
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147 EXPORT_C CFbsBitmap* CImageHandler::ScaledBitmap() |
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148 { |
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149 return iScaledBitmap; |
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150 } |
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151 |
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152 void CImageHandler::ScaleL() |
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153 { |
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154 __ASSERT_ALWAYS(!IsActive(),User::Invariant()); |
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155 if ( iScaler ) |
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156 { |
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157 delete iScaler; |
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158 } |
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159 iScaler = NULL; |
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160 iScaler = CBitmapScaler::NewL(); |
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161 iScaler->Scale(&iStatus, *iBitmap, *iScaledBitmap, ETrue); |
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162 SetActive(); |
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163 } |
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164 |
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165 // ----------------------------------------------------------------------------- |
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166 // CImageHandler::FrameInfo |
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167 // Get the current frame information. |
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168 // ----------------------------------------------------------------------------- |
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169 // |
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170 const TFrameInfo& CImageHandler::FrameInfo() const |
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171 { |
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172 return iFrameInfo; |
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173 } |
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174 |
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175 // ----------------------------------------------------------------------------- |
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176 // CImageHandler::RunL |
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177 // CActive::RunL() implementation. Called on image load success/failure. |
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178 // ----------------------------------------------------------------------------- |
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179 // |
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180 void CImageHandler::RunL() |
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181 { |
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182 if ((! iStatus.Int()) && (iSize.iWidth != 0) && (iSize.iHeight != 0)) |
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183 { |
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184 ScaleL(); |
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185 iSize.SetSize(0,0); |
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186 } |
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187 else |
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188 { |
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189 // Invoke callback. |
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190 iCallback->ImageOperationCompleteL(iStatus.Int()); |
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191 if(iCallbackQue.Count()) |
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192 { |
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193 TInt loaderror = KErrNotFound; |
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194 while(loaderror != KErrNone && iCallbackQue.Count()) |
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195 { |
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196 TImageStruct imageStruct= iCallbackQue[0]; |
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197 iCallbackQue.Remove(0); |
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198 TRAP(loaderror, LoadFileAndScaleL(imageStruct.iScaledImage, imageStruct.iFileName, imageStruct.iScaledSize, *imageStruct.iCallBack)); |
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199 } |
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200 } |
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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 // CImageHandler::DoCancel |
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207 // CActive::Cancel() implementation. Stops decoding. |
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208 // ----------------------------------------------------------------------------- |
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209 // |
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210 void CImageHandler::DoCancel() |
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211 { |
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212 if ( iDecoder ) |
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213 { |
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214 iDecoder->Cancel(); |
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215 } |
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216 if ( iScaler ) |
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217 { |
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218 iScaler->Cancel(); |
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219 } |
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220 } |
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221 |
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222 |
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223 |