1 /* |
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2 * Copyright (c) 2010 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: |
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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 #include "gifanimator.h" |
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21 |
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22 #include <s32file.h> |
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23 #include <fbs.h> |
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24 #include <gdi.h> |
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25 #include <imageconversion.h> |
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26 #include "enginewrapper.h" |
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27 |
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28 |
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29 // --------------------------------------------------------------------------- |
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30 |
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31 TInt CGifAnimator::CreateGifAnimation(const TDesC& aFileName, TSize aDimensions, CVideoFrameArray* aVideoFrameArray, EngineWrapper& aEngineWrapper) |
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32 { |
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33 CGifAnimator* self = new(ELeave) CGifAnimator; |
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34 CleanupStack::PushL(self); |
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35 TRAPD(err, self->StartL(aFileName, aDimensions, aVideoFrameArray, aEngineWrapper)); |
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36 CleanupStack::PopAndDestroy(); |
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37 return err; |
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38 } |
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39 |
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40 // --------------------------------------------------------------------------- |
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41 |
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42 CGifAnimator::CGifAnimator() |
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43 { |
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44 } |
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45 |
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46 // --------------------------------------------------------------------------- |
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47 |
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48 void CGifAnimator::StartL(const TDesC& aFileName, const TSize& aDimensions, CVideoFrameArray* aVideoFrameArray, EngineWrapper& aEngineWrapper) |
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49 { |
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50 |
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51 __ASSERT_ALWAYS(aFileName.Length() > 0, User::Panic(_L("GifAnim"), 100)); |
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52 __ASSERT_ALWAYS(aDimensions.iHeight > 0, User::Panic(_L("GifAnim"), 101)); |
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53 __ASSERT_ALWAYS(aDimensions.iWidth > 0, User::Panic(_L("GifAnim"), 102)); |
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54 __ASSERT_ALWAYS(aVideoFrameArray != NULL, User::Panic(_L("GifAnim"), 103)); |
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55 |
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56 |
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57 // show a progress dialog |
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58 aEngineWrapper.ShowProgressBar(aVideoFrameArray->Count()-1); |
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59 |
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60 // open the file for writing |
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61 User::LeaveIfError(iFs.Connect()); |
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62 User::LeaveIfError(iOutFile.Replace(iFs, aFileName, EFileWrite)); |
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63 |
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64 // write header |
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65 WriteHeaderL(aDimensions); |
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66 |
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67 // process each frame of the animation |
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68 for (TInt i=0; i<aVideoFrameArray->Count(); i++) |
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69 { |
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70 // write headers and raster block |
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71 TVideoFrame frame = aVideoFrameArray->At(i); |
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72 WriteGraphicControlL(frame); |
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73 CFbsBitmap* bitmap = GetBitmapLC(frame, aDimensions); |
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74 WriteImageDescriptorL(frame); |
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75 WriteRasterDataL(bitmap); |
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76 CleanupStack::PopAndDestroy(); //bitmap |
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77 |
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78 // update the progress bar |
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79 aEngineWrapper.IncrementProgressbarValue(); |
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80 } |
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81 |
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82 // write footer and finish |
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83 WriteFooterL(); |
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84 FinishL(); |
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85 |
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86 // remove the progress dialog from the screen |
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87 aEngineWrapper.CloseProgressbar(); |
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88 } |
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89 |
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90 // --------------------------------------------------------------------------- |
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91 |
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92 CGifAnimator::~CGifAnimator() |
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93 { |
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94 |
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95 if (iImageEncoder) |
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96 delete iImageEncoder; |
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97 |
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98 if (iGIFImageData) |
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99 delete iGIFImageData; |
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100 |
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101 } |
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102 |
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103 // --------------------------------------------------------------------------- |
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104 |
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105 void CGifAnimator::WriteHeaderL(const TSize& aDimensions) |
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106 { |
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107 WriteInt8L('G'); |
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108 WriteInt8L('I'); |
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109 WriteInt8L('F'); |
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110 WriteInt8L('8'); |
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111 WriteInt8L('9'); |
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112 WriteInt8L('a'); |
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113 |
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114 WriteInt16L(aDimensions.iWidth); // width of animation |
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115 WriteInt16L(aDimensions.iHeight); // height of animation |
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116 |
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117 // logical screen descriptor |
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118 TUint8 packedFlags = 0; |
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119 packedFlags |= 8 - 1; // size of colour table is number of bits in each color table minus one (bits 0-2) |
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120 packedFlags |= (8 - 1) << 4; // colour resolution ie maximum size of the original colour palette (bits 4-6) |
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121 packedFlags |= 0x80; // use global colour table (bit 7) |
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122 |
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123 WriteInt8L(packedFlags); |
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124 |
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125 WriteInt8L(TRANSPARENCY_INDEX); // background color index |
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126 |
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127 WriteInt8L(0); // pixel aspect ratio, 0=not used |
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128 |
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129 // write the Symbian default palette since that's what is used |
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130 CPalette* palette = CPalette::NewDefaultL(EColor256); |
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131 CleanupStack::PushL(palette); |
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132 |
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133 for (TInt i=0; i<palette->Entries(); i++) |
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134 { |
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135 TRgb entry = palette->GetEntry(i); |
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136 |
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137 WriteInt8L(entry.Red()); |
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138 WriteInt8L(entry.Green()); |
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139 WriteInt8L(entry.Blue()); |
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140 } |
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141 |
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142 CleanupStack::PopAndDestroy(); //palette |
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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 CGifAnimator::WriteGraphicControlL(const TVideoFrame& aFrame) |
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148 { |
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149 TInt packedFlags(0); |
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150 |
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151 // enable transparency if needed |
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152 if (aFrame.iEnableTransparency) |
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153 packedFlags |= 0x01; |
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154 |
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155 // set disposal method: |
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156 // 0 = disposal method not specified, 1 = do not dispose of graphic, |
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157 // 2 = overwrite graphic with background color, 3 = overwrite graphic with previous graphic |
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158 TInt disposalMethod = 1; |
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159 packedFlags |= ((disposalMethod << 2) & 0x1c); |
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160 |
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161 WriteInt8L(0x21); // GIF extension |
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162 WriteInt8L(0xf9); // GIF graphic control block |
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163 WriteInt8L(0x04); // block size |
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164 WriteInt8L(packedFlags); // packed |
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165 WriteInt16L(aFrame.iDelay); // delay |
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166 WriteInt8L(TRANSPARENCY_INDEX); // transparent color index |
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167 WriteInt8L(0); // block terminator, always 0 |
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168 } |
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169 |
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170 // --------------------------------------------------------------------------- |
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171 |
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172 void CGifAnimator::WriteImageDescriptorL(const TVideoFrame& aFrame) |
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173 { |
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174 WriteInt8L(0x2c); // GIF image descriptor |
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175 WriteInt16L(aFrame.iXPos); |
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176 WriteInt16L(aFrame.iYPos); |
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177 WriteInt16L(aFrame.iWidth); |
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178 WriteInt16L(aFrame.iHeight); |
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179 WriteInt8L(0); // packed flags, none specified in this case |
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180 } |
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181 |
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182 // --------------------------------------------------------------------------- |
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183 |
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184 CFbsBitmap* CGifAnimator::GetBitmapLC(TVideoFrame& aFrame, const TSize& aDimensions) |
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185 { |
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186 CFbsBitmap* bitmap = new(ELeave) CFbsBitmap; |
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187 CleanupStack::PushL(bitmap); |
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188 |
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189 // read the bitmap from the temporary file |
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190 RFile bitmapFile; |
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191 User::LeaveIfError( bitmapFile.Open(iFs, aFrame.iFileStorePath, EFileRead) ); |
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192 RFileReadStream readStream(bitmapFile); |
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193 bitmap->InternalizeL(readStream); |
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194 readStream.Close(); |
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195 bitmapFile.Close(); |
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196 |
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197 // delete the temporary file since it's not needed anymore |
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198 iFs.Delete(aFrame.iFileStorePath); |
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199 |
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200 // resize the bitmap to match the video dimensions if it is a full screen one |
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201 if (aFrame.iFillsWholeScreen && (aFrame.iWidth != aDimensions.iWidth || aFrame.iHeight != aDimensions.iHeight)) |
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202 { |
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203 if (bitmap->Resize(aDimensions) == KErrNone) |
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204 { |
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205 // also update dimensions of this frame to match the dimensions of the video |
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206 aFrame.iWidth = aDimensions.iWidth; |
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207 aFrame.iHeight = aDimensions.iHeight; |
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208 } |
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209 } |
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210 |
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211 return bitmap; |
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212 } |
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213 |
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214 // --------------------------------------------------------------------------- |
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215 |
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216 void CGifAnimator::WriteRasterDataL(CFbsBitmap* aBitmap) |
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217 { |
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218 // reset the encoder |
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219 if (iImageEncoder) |
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220 { |
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221 delete iImageEncoder; |
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222 iImageEncoder = NULL; |
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223 } |
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224 |
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225 // make sure the buffer for conversion is empty |
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226 if (iGIFImageData) |
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227 { |
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228 delete iGIFImageData; |
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229 iGIFImageData = NULL; |
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230 } |
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231 |
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232 |
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233 TRequestStatus Stat = KRequestPending; |
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234 |
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235 // init & convert the bitmap to GIF format |
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236 iImageEncoder = CImageEncoder::DataNewL(iGIFImageData, CImageEncoder::EOptionAlwaysThread, KImageTypeGIFUid); |
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237 iImageEncoder->Convert( &Stat, *aBitmap ); |
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238 User::WaitForRequest(Stat); |
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239 |
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240 |
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241 // check any erros in converting |
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242 User::LeaveIfError( Stat.Int() ); |
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243 |
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244 // check if we have valid data |
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245 if (iGIFImageData == NULL || iGIFImageData->Des().Length()<793) |
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246 User::Leave(KErrNoMemory); |
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247 |
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248 // in GIF files generated by Symbian, the raster data always starts at offset 791, |
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249 // initial code size in GIF encoding should be 8 since we have a 8bpp image, |
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250 // also check that the second last byte is the terminator 0, |
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251 // if this check fails in newer releases of S60, proper parsing of GIF format is probably needed |
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252 TUint8* imagePtr = &iGIFImageData->Des()[0]; |
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253 if (imagePtr[791] != 8 || imagePtr[iGIFImageData->Des().Length()-2] != 0) |
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254 User::Leave(KErrNotSupported); |
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255 |
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256 // write the raster data block to the file |
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257 TUint writeLength = iGIFImageData->Des().Length() - 1 - 791; |
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258 imagePtr+=791; |
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259 TPtr8 writePtr(imagePtr, writeLength, writeLength); |
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260 User::LeaveIfError( iOutFile.Write(writePtr) ); |
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261 } |
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262 |
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263 // --------------------------------------------------------------------------- |
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264 |
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265 void CGifAnimator::WriteFooterL() |
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266 { |
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267 WriteInt8L(0x3b); // GIF trailer |
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268 } |
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269 |
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270 // --------------------------------------------------------------------------- |
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271 |
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272 void CGifAnimator::FinishL() |
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273 { |
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274 iOutFile.Close(); |
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275 iFs.Close(); |
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276 } |
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277 |
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278 // --------------------------------------------------------------------------- |
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279 |
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280 void CGifAnimator::WriteInt8L(TInt aValue) |
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281 { |
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282 HBufC8* buf = HBufC8::NewMaxLC(1); |
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283 |
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284 TUint8* ptr = &buf->Des()[0]; |
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285 ptr[0] = TUint8(aValue); |
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286 |
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287 User::LeaveIfError( iOutFile.Write(buf->Des()) ); |
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288 |
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289 CleanupStack::PopAndDestroy(); // buf |
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290 } |
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291 |
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292 // --------------------------------------------------------------------------- |
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293 |
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294 void CGifAnimator::WriteInt16L(TInt aValue) |
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295 { |
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296 HBufC8* buf = HBufC8::NewMaxLC(2); |
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297 |
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298 TUint8* ptr = &buf->Des()[0]; |
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299 ptr[0] = TUint8(aValue); |
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300 ptr[1] = TUint8(aValue>>8); |
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301 |
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302 User::LeaveIfError( iOutFile.Write(buf->Des()) ); |
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303 |
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304 CleanupStack::PopAndDestroy(); // buf |
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305 } |
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306 |
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307 // --------------------------------------------------------------------------- |
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308 |
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