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1 /* |
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2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). |
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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 "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 * |
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14 * Description: Utility class for asynchronously decoding the header thumbnail image |
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15 * |
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16 */ |
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17 |
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18 |
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19 #ifndef CVIMPSTDETAILSIMAGEDECODER_H_ |
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20 #define CVIMPSTDETAILSIMAGEDECODER_H_ |
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21 |
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22 #include <e32base.h> |
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23 #include <f32file.h> |
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24 |
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25 class CVIMPSTDetailsHeaderControl; |
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26 class CImageDecoder; |
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27 class CFbsBitmap; |
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28 class CBitmapScaler; |
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29 |
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30 /** |
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31 * Utility class for asynchronously decoding the header thumbnail image |
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32 * |
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33 * @lib vimpstdetailsviewplugin.dll |
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34 * @since S60 v5.0 |
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35 */ |
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36 class CVIMPSTDetailsImageDecoder : public CActive |
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37 { |
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38 public: |
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39 /** |
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40 * Two-phased constructor |
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41 * |
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42 * @param aHeader The header control to which the bitmap is to be inserted after loading |
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43 * @param aBitmapData Descriptor containing the bitmap data stream |
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44 * @return a instance of same class |
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45 * @since S60 v5.0 |
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46 */ |
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47 static CVIMPSTDetailsImageDecoder* NewL(CVIMPSTDetailsHeaderControl& aHeader, const TDesC8& aBitmapData); |
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48 |
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49 /** |
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50 * Destructor |
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51 * @since S60 v5.0 |
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52 */ |
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53 ~CVIMPSTDetailsImageDecoder(); |
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54 |
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55 /** |
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56 * Starts the decoding process |
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57 * @since S60 v5.0 |
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58 * |
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59 */ |
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60 void StartL(TSize aBitmapSize); |
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61 |
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62 /** |
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63 * From CActive |
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64 * (see details from baseclass ) |
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65 * @since S60 v5.0 |
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66 */ |
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67 void RunL(); |
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68 |
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69 /** |
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70 * From CActive |
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71 * (see details from baseclass ) |
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72 * @since S60 v5.0 |
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73 */ |
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74 void DoCancel(); |
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75 private: |
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76 /** |
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77 * First-phase (C++) constructor |
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78 * @param aHeader The header control to which the bitmap is to be inserted after loading |
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79 * @since S60 v5.0 |
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80 */ |
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81 CVIMPSTDetailsImageDecoder(CVIMPSTDetailsHeaderControl& aHeader); |
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82 |
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83 /** |
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84 * Second phase constructor |
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85 * @since S60 v5.0 |
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86 * @param aBitmapData Descriptor containing the bitmap data stream |
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87 */ |
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88 void ConstructL(const TDesC8& aBitmapData); |
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89 /** |
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90 * Scales bitmap |
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91 * |
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92 */ |
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93 void ScaleBitmapL(); |
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94 |
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95 enum TCcaImageDecoderState |
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96 { |
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97 ECcaConvertThumbnailImage = 1, |
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98 ECcaScaleThumbnail, |
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99 }; |
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100 |
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101 /** |
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102 * Create bitmap |
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103 * |
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104 */ |
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105 void CreateBitmapL(); |
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106 private : // data |
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107 |
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108 |
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109 /** |
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110 * Not Owns : The header control to which the bitmap is to be inserted after loading |
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111 */ |
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112 CVIMPSTDetailsHeaderControl& iHeader; |
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113 |
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114 |
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115 /** |
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116 * Owns : The image decoder whose service is called to decode the image |
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117 */ |
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118 CImageDecoder* iImgDecoder; |
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119 |
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120 /** |
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121 * Owns : Handle to the file server session for loading the bitmap |
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122 */ |
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123 RFs iFs; |
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124 |
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125 /** |
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126 * The bitmap. |
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127 * Owned until decoding is complete, then ownersip is transferred to header control. |
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128 */ |
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129 CFbsBitmap* iBitmap; // owned until completion |
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130 |
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131 /** |
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132 * Owns : Copy of the bitmap data stream |
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133 */ |
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134 HBufC8* iBitmapData; |
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135 |
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136 /** |
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137 * The image scaler whose service is called to scale the image |
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138 * Own. |
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139 */ |
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140 CBitmapScaler* iBitmapScaler; |
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141 |
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142 TSize iBitmapSize; |
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143 |
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144 /** |
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145 * Decoder internal state |
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146 */ |
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147 TInt iDecoderState; |
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148 }; |
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149 |
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150 #endif /*CVIMPSTDETAILSIMAGEDECODER_H_*/ |