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annotate DemoCube/src/ImageLoader.cpp @ 1:0a2b5a968ce7

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Modifications that turn this Nokia-supplied DemoCube demo into a web-browser mockup that uses optical flow for panning operations.
author Atul Varma <varmaa@toolness.com>
date Tue, 12 Feb 2008 17:32:01 -0600
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1 /*=====================================================================
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3 Copyright © 2007 Nokia Corporation. All rights reserved.
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5 ======================================================================*/
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7 // ImageSaver.cpp: implementation of the CImageLoader class.
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8 //
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9 //////////////////////////////////////////////////////////////////////
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10
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11 #include <eikenv.h> // for CEikonEnv - "Eikon Environment"
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12 #include <PathInfo.h>
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13 #include <ImageConversion.h>
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15 #include "ImageLoader.h"
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17 _LIT8(KMimeType,"image/png");
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19 //////////////////////////////////////////////////////////////////////
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20 // Construction/Destruction
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21 //////////////////////////////////////////////////////////////////////
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23 void CImageLoader::ConstructL()
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24 {
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25 }
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28 CImageLoader* CImageLoader::NewL(TChar tDrive)
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29 {
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30 CImageLoader* self = new (ELeave) CImageLoader(tDrive);
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31
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32 CleanupStack::PushL( self );
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33 self->ConstructL();
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34 CleanupStack::Pop();
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35
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36 return self;
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37 }
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38
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39
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40 CImageLoader::CImageLoader(TChar tDrive):CActive( CActive::EPriorityStandard )
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41 {
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42 CActiveScheduler::Add( this );
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43
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44 pImageDecoder = NULL;
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45 iDrive = tDrive;
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46 }
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47
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48
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49 CImageLoader::~CImageLoader()
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50 {
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51 if (pImageDecoder)
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52 delete pImageDecoder;
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53 pImageDecoder = NULL;
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54
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55 // delete iImagePath;
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56 }
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57
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58
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59 //functions
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60 void CImageLoader::DoCancel()
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61 {
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62 //in case image saving is cancelled for whatever reason
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63 pImageDecoder->Cancel();
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64
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65 DeleteDecoder();
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66 }
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67
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68
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69 void CImageLoader::RunL()
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70 {
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71 if (iStatus != KErrNone) {
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72 TRequestStatus* s=&iStatus;
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73 User::RequestComplete(s, KErrNone);
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74
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75 SetActive();
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76 return;
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77 }
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78
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79 DeleteDecoder();
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80 }
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81
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82
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83 void CImageLoader::RunError()
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84 {
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85 RunL(); //cleanup
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86 }
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87
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88
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89 void CImageLoader::DeleteDecoder()
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90 {
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91 if (pImageDecoder)
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92 delete pImageDecoder;
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93 pImageDecoder = NULL;
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94 }
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95
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96
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97 void CImageLoader::LoadImage(const TDesC &aFilename, CFbsBitmap *pImg)
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98 {
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99 RFs fSystem = CEikonEnv::Static()->FsSession();
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100
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101 #if defined( __WINS__ )
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102 _LIT(SpriteFilePath, "%c:\\pictures\\"); // Path for emulator build
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103 iFilename.Format( SpriteFilePath, iDrive );
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104 iFilename.Append(aFilename);
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105 #else
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106 // _LIT(KFileName, "%c:\\system\\apps\\Track\\"); // Path for HW release
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107 _LIT(SpriteFilePath, "%c:\\"); // Path for HW release
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108 iFilename.Format( SpriteFilePath, (char)iDrive );
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109 iFilename.Append(aFilename);
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110 #endif
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111
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112 iNewFileName.Copy(iFilename);
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113
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114 if (!pImageDecoder)
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115 pImageDecoder = CImageDecoder::FileNewL(fSystem, iNewFileName, KMimeType, CImageDecoder::EOptionAlwaysThread );
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116
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117 //if not busy, start to do the conversion
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118 if ( !IsActive() ) {
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119 pImageDecoder->Convert( &iStatus, *pImg );
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120 SetActive();
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121
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122 //loop until the encoding is done
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123 do {
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124 // SleepForSecs(1);
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125 SleepForMicrosecs(1);
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126 } while (iStatus != KErrNone);
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127 }
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128 }
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129
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130
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131
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132 void CImageLoader::SleepForMicrosecs(TInt iMicroSecsToSleep)
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133 {
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134 TTime tNow;
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135 tNow.HomeTime();
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136
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137 TTimeIntervalMicroSeconds tMicroSecsToSleep;
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138 tMicroSecsToSleep = iMicroSecsToSleep;
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139
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140 //sleep for iMicroSecsToSleep
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141 User::At(tNow + tMicroSecsToSleep);
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142
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143 }
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144