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1 /* |
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2 * Copyright (c) 2006-2007 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: Base class for tasks which load thumbnails |
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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 |
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20 |
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21 #ifndef C_GLXTNLOADTHUMBNAILTASK_H |
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22 #define C_GLXTNLOADTHUMBNAILTASK_H |
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23 |
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24 #include "glxtntask.h" |
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25 #include "glxtnstd.h" |
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26 |
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27 // Forward declarations |
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28 class CGlxtnFileInfo; |
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29 class CGlxtnFileUtility; |
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30 class CFbsBitmap; |
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31 class CImageDecoder; |
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32 class TGlxThumbnailRequest; |
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33 |
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34 /** |
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35 * Base class for tasks which load thumbnails. |
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36 * |
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37 * @author Dan Rhodes |
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38 * @ingroup glx_thumbnail_creator |
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39 */ |
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40 NONSHARABLE_CLASS( CGlxtnLoadThumbnailTask ) : public CGlxtnClientTask |
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41 { |
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42 public: |
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43 /** |
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44 * Destructor. |
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45 */ |
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46 ~CGlxtnLoadThumbnailTask(); |
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47 |
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48 protected: // From CGlxtnTask |
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49 void DoCancel(); |
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50 |
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51 protected: |
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52 /** |
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53 * C++ default constructor. |
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54 * @param aId Task type ID. |
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55 * @param aRequestInfo Parameters for the thumbnail request. |
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56 * @param aFileUtility File utility for use by the task. |
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57 * @param aClient Client initiating the request. |
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58 */ |
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59 CGlxtnLoadThumbnailTask( const TGlxtnTaskId& aId, |
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60 const TGlxThumbnailRequest& aRequestInfo, |
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61 CGlxtnFileUtility& aFileUtility, |
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62 MGlxtnThumbnailCreatorClient& aClient ); |
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63 /** |
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64 * Symbian 2nd phase constructor. |
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65 * @param aBitmapHandle Handle to bitmap in which to store the thumbnail. |
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66 */ |
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67 void ConstructL( TInt aBitmapHandle ); |
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68 |
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69 /** |
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70 * Start asynchronous loading. |
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71 * @param aStatus Request status for the asynchronous operation. |
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72 * @return ETrue if an asynchronous operation has been started. |
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73 */ |
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74 TBool LoadThumbnailL( TRequestStatus& aStatus ); |
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75 /** |
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76 * Create bitmap from loaded thumbnail data. |
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77 * @param aStatus Request status for the asynchronous operation. |
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78 * @return ETrue if an asynchronous operation has been started. |
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79 */ |
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80 TBool HandleLoadedThumbnailL( TRequestStatus& aStatus ); |
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81 /** |
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82 * Start asynchronous decoding. iDecoder should point to a valid decoder. |
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83 * @param aStatus Request status for the asynchronous operation. |
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84 * @param aScaleBitmap If true, scale the loaded bitmap close to |
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85 * requested size. |
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86 */ |
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87 void DecodeThumbnailL( TRequestStatus& aStatus, TBool aScaleBitmap ); |
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88 |
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89 protected: |
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90 enum TGeneratorState |
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91 { |
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92 EStateFetchingUri, EStateLoading, EStateDecodingThumbnail, |
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93 EStateDecodingImage, EStateScaling, EStateFiltering |
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94 }; |
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95 |
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96 /** File utility */ |
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97 CGlxtnFileUtility& iFileUtility; |
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98 /** Current state for task state machine */ |
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99 TGeneratorState iState; |
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100 /** File information for item to thumbnail (owned) */ |
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101 CGlxtnFileInfo* iInfo; |
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102 /** Requested thumbnail size */ |
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103 TSize iRequestedSize; |
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104 /** Thumbnail image data (owned) */ |
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105 HBufC8* iThumbData; |
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106 /** Thumbnail data format */ |
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107 TGlxImageDataFormat iFormat; |
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108 /** Decoder to decode the thumbnail data (owned) */ |
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109 CImageDecoder* iDecoder; |
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110 /** Bitmap to decode image into (owned) */ |
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111 CFbsBitmap* iThumbnail; |
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112 /** DRM allowed flag passed from thumbnail request */ |
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113 TBool iDrmAllowed; |
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114 }; |
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115 |
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116 #endif // C_GLXTNLOADTHUMBNAILTASK_H |