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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_p_n_g_codec_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Multimedia/ICL/ICLCodec/PNGCodec.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Multimedia/ICL/ICLCodec/PNGCodec.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// PngCodec.CPP</span>
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<a name="l00002"></a>00002 <span class="comment">//</span>
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<a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00004"></a>00004 <span class="comment">// All rights reserved.</span>
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<a name="l00005"></a>00005 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00006"></a>00006 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00007"></a>00007 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00008"></a>00008 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00009"></a>00009 <span class="comment">//</span>
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<a name="l00010"></a>00010 <span class="comment">// Initial Contributors:</span>
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<a name="l00011"></a>00011 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Contributors:</span>
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<a name="l00014"></a>00014 <span class="comment">//</span>
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<a name="l00015"></a>00015 <span class="comment">// Description:</span>
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<a name="l00016"></a>00016 <span class="comment">//</span>
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<a name="l00017"></a>00017 <span class="comment">//</span>
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<a name="l00018"></a>00018
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<a name="l00019"></a>00019 <span class="preprocessor">#include &lt;fbs.h&gt;</span>
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<a name="l00020"></a>00020
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<a name="l00021"></a>00021 <span class="preprocessor">#include &quot;ImageUtils.h&quot;</span>
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<a name="l00022"></a>00022 <span class="preprocessor">#include &quot;PNGCodec.h&quot;</span>
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<a name="l00023"></a>00023
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<a name="l00024"></a>00024 <span class="comment">// Constants.</span>
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<a name="l00025"></a>00025 <span class="keyword">const</span> TInt KTwipsPerMeter = 56693;
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<a name="l00026"></a>00026
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<a name="l00027"></a>00027 <span class="comment">// </span>
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<a name="l00028"></a>00028 <span class="comment">// TPngImageInformation: PNG image information</span>
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<a name="l00029"></a>00029 <span class="comment">//</span>
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<a name="l00030"></a>00030
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<a name="l00031"></a>00031 <span class="comment">// Initialise default PNG image information</span>
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<a name="l00032"></a>00032 TPngImageInformation::TPngImageInformation()
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<a name="l00033"></a>00033         {
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<a name="l00034"></a>00034         iSize.SetSize(0,0);
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<a name="l00035"></a>00035         iBitDepth = 0;
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<a name="l00036"></a>00036         iColorType = EGrayscale;
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<a name="l00037"></a>00037         iCompressionMethod = EDeflateInflate32K;
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<a name="l00038"></a>00038         iFilterMethod = EAdaptiveFiltering;
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<a name="l00039"></a>00039         iInterlaceMethod = ENoInterlace;
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<a name="l00040"></a>00040         iPalettePresent = EFalse;
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<a name="l00041"></a>00041
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<a name="l00042"></a>00042 <span class="preprocessor">#if defined(_DEBUG)</span>
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<a name="l00043"></a>00043 <span class="preprocessor"></span>        <span class="comment">// as an optimisation, we are going to set iPalette to all zeros, instead of setting</span>
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<a name="l00044"></a>00044         <span class="comment">// each element to KRgbBlack. This assumes that KRbgBlack is itself zero.</span>
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<a name="l00045"></a>00045         ASSERT(<span class="keyword">sizeof</span>(TRgb)==<span class="keyword">sizeof</span>(TUint32)); <span class="comment">// ie no new fields</span>
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<a name="l00046"></a>00046         ASSERT(KRgbBlack.Value()==0); <span class="comment">// ie the one value is zero</span>
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<a name="l00047"></a>00047 <span class="preprocessor">#endif // defined(_DEBUG)</span>
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<a name="l00048"></a>00048 <span class="preprocessor"></span>
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<a name="l00049"></a>00049         Mem::FillZ(iPalette, KPngMaxPLTESize*<span class="keyword">sizeof</span>(TRgb));
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<a name="l00050"></a>00050
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<a name="l00051"></a>00051         iBackgroundPresent = EFalse;
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<a name="l00052"></a>00052         iBackgroundColor = KRgbWhite;
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<a name="l00053"></a>00053         iPhysicalPresent = EFalse;
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<a name="l00054"></a>00054         iPhysicalUnits = EUnknownUnits;
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<a name="l00055"></a>00055         iPhysicalSize.SetSize(0,0);
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<a name="l00056"></a>00056         iTransparencyPresent = EFalse;
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<a name="l00057"></a>00057         Mem::Fill(iTransparencyValue,KPngMaxPLTESize,0xff);
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<a name="l00058"></a>00058         }
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<a name="l00059"></a>00059
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<a name="l00060"></a>00060
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<a name="l00061"></a>00061 <span class="comment">//</span>
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<a name="l00062"></a>00062 <span class="comment">// CPngReadCodec: reads a PNG image</span>
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<a name="l00063"></a>00063 <span class="comment">//</span>
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<a name="l00064"></a>00064
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<a name="l00065"></a>00065 CPngReadCodec::~CPngReadCodec()
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<a name="l00066"></a>00066         {
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<a name="l00067"></a>00067         <span class="keyword">delete</span> iDecoder;
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<a name="l00068"></a>00068         <span class="keyword">delete</span> iDecompressor;
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<a name="l00069"></a>00069         }
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<a name="l00070"></a>00070
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<a name="l00071"></a>00071 <span class="comment">// Called by framework when a Convert operation begins</span>
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<a name="l00072"></a>00072 <span class="keywordtype">void</span> CPngReadCodec::InitFrameL(TFrameInfo&amp; <span class="comment">/*aFrameInfo*/</span>, CFrameImageData&amp; <span class="comment">/*aFrameImageData*/</span>,
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<a name="l00073"></a>00073         TBool aDisableErrorDiffusion, CFbsBitmap&amp; aDestination, CFbsBitmap* aDestinationMask)
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<a name="l00074"></a>00074         {
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<a name="l00075"></a>00075         CFbsBitmap&amp; newFrame = aDestination;
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<a name="l00076"></a>00076
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<a name="l00077"></a>00077         TPoint&amp; pos = Pos();
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<a name="l00078"></a>00078         pos.SetXY(0,0);
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<a name="l00079"></a>00079         iChunkBytesRemaining = 0;
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<a name="l00080"></a>00080
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<a name="l00081"></a>00081         <span class="comment">// Use the supplied image processor</span>
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<a name="l00082"></a>00082         CImageProcessor* imageProc = ImageProcessorUtility::NewImageProcessorL(newFrame, iImageInfo.iSize, ERgb, aDisableErrorDiffusion);
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<a name="l00083"></a>00083         SetImageProcessor(imageProc);
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<a name="l00084"></a>00084         imageProc-&gt;PrepareL(newFrame,iImageInfo.iSize);
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<a name="l00085"></a>00085
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<a name="l00086"></a>00086         CImageProcessor* maskProc = NULL;
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<a name="l00087"></a>00087         SetMaskProcessor(NULL);
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<a name="l00088"></a>00088
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<a name="l00089"></a>00089         <span class="comment">// If transparency is being used, create a bitmap mask as well</span>
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<a name="l00090"></a>00090         <span class="keywordflow">if</span> ((iImageInfo.iTransparencyPresent || (iImageInfo.iColorType &amp; TPngImageInformation::EAlphaChannelUsed))
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<a name="l00091"></a>00091                 &amp;&amp; aDestinationMask)
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<a name="l00092"></a>00092                 {
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<a name="l00093"></a>00093                 maskProc = ImageProcessorUtility::NewImageProcessorL(*aDestinationMask, iImageInfo.iSize, ERgb, aDisableErrorDiffusion);
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<a name="l00094"></a>00094                 SetMaskProcessor(maskProc);
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   105
 
<a name="l00095"></a>00095                 maskProc-&gt;PrepareL(*aDestinationMask,iImageInfo.iSize);
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   106
 
<a name="l00096"></a>00096                 <span class="comment">// set mask to black so that unknown parts on streamed image are not drawn</span>
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   107
 
<a name="l00097"></a>00097                 ClearBitmapL(*aDestinationMask, KRgbBlack);
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   108
 
<a name="l00098"></a>00098                 }
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   109
 
<a name="l00099"></a>00099
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   110
 
<a name="l00100"></a>00100         <span class="comment">// Create a helper to read the scan lines</span>
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   111
 
<a name="l00101"></a>00101         <span class="keyword">delete</span> iDecoder;
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   112
 
<a name="l00102"></a>00102         iDecoder = NULL;
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   113
 
<a name="l00103"></a>00103         iDecoder = CPngReadSubCodec::NewL(imageProc,maskProc,iImageInfo);
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   114
 
<a name="l00104"></a>00104
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   115
 
<a name="l00105"></a>00105         <span class="comment">// And a unzipper to decompress image data</span>
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   116
 
<a name="l00106"></a>00106         <span class="keywordflow">if</span> (!iDecompressor)
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   117
 
<a name="l00107"></a>00107                 iDecompressor = CEZDecompressor::NewL(*<span class="keyword">this</span>);
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<a name="l00108"></a>00108         <span class="keywordflow">else</span>
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   119
 
<a name="l00109"></a>00109                 iDecompressor-&gt;ResetL(*<span class="keyword">this</span>);
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   120
 
<a name="l00110"></a>00110
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   121
 
<a name="l00111"></a>00111         <span class="keywordflow">if</span> (maskProc==NULL)
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   122
 
<a name="l00112"></a>00112                 {
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   123
 
<a name="l00113"></a>00113                 <span class="comment">// if no mask, clear destination for sensible behaviour on streamed partial images</span>
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   124
 
<a name="l00114"></a>00114                 TRgb background = iImageInfo.iBackgroundPresent ? iImageInfo.iBackgroundColor : KRgbWhite;
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   125
 
<a name="l00115"></a>00115                 ClearBitmapL(aDestination, background);
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   126
 
<a name="l00116"></a>00116                 }
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<a name="l00117"></a>00117         }
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   128
 
<a name="l00118"></a>00118
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   129
 
<a name="l00119"></a>00119 <span class="comment">// Called by framework to initialise image frame header</span>
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   130
 
<a name="l00120"></a>00120 <span class="keywordtype">void</span> CPngReadCodec::InitFrameHeader(TFrameInfo&amp; aFrameSettings, CFrameImageData&amp; <span class="comment">/* aFrameImageData */</span>)
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   131
 
<a name="l00121"></a>00121         {
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   132
 
<a name="l00122"></a>00122         ASSERT(aFrameSettings.CurrentFrameState() == TFrameInfo::EFrameInfoUninitialised);
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   133
 
<a name="l00123"></a>00123         iFrameInfo = &amp;aFrameSettings;
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   134
 
<a name="l00124"></a>00124         iFrameInfo-&gt;SetCurrentFrameState(TFrameInfo::EFrameInfoProcessingFrameHeader);
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   135
 
<a name="l00125"></a>00125         }
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   136
 
<a name="l00126"></a>00126
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   137
 
<a name="l00127"></a>00127 <span class="comment">// Called by framework to process a header for a frame</span>
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   138
 
<a name="l00128"></a>00128 TFrameState CPngReadCodec::ProcessFrameHeaderL(TBufPtr8&amp; aData)
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   139
 
<a name="l00129"></a>00129         {
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   140
 
<a name="l00130"></a>00130         <span class="keyword">const</span> TUint8* startDataPtr = aData.Ptr();
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   141
 
<a name="l00131"></a>00131         <span class="keyword">const</span> TUint8* dataPtr = startDataPtr;
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<a name="l00132"></a>00132         <span class="keyword">const</span> TUint8* dataPtrLimit = startDataPtr + aData.Length();
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   143
 
<a name="l00133"></a>00133
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   144
 
<a name="l00134"></a>00134         <span class="comment">// Process the mandatory PNG header chunk: sets up iImageInfo</span>
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   145
 
<a name="l00135"></a>00135         <span class="keywordflow">if</span> (iFrameInfo-&gt;CurrentFrameState() == TFrameInfo::EFrameInfoProcessingFrameHeader)
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   146
 
<a name="l00136"></a>00136                 {
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   147
 
<a name="l00137"></a>00137                 <span class="keywordflow">if</span> (dataPtr + KPngChunkLengthSize + KPngChunkIdSize + KPngIHDRChunkSize + KPngChunkCRCSize &gt; dataPtrLimit)
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   148
 
<a name="l00138"></a>00138                         User::Leave(KErrUnderflow);
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   149
 
<a name="l00139"></a>00139
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   150
 
<a name="l00140"></a>00140                 TInt chunkLength = PtrReadUtil::ReadBigEndianUint32Inc(dataPtr);
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   151
 
<a name="l00141"></a>00141                 TPtrC8 chunkId(dataPtr,KPngChunkIdSize);
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   152
 
<a name="l00142"></a>00142
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<a name="l00143"></a>00143                 <span class="keywordflow">if</span> (chunkLength != KPngIHDRChunkSize || chunkId != KPngIHDRChunkId)
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<a name="l00144"></a>00144                         User::Leave(KErrNotFound);
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   155
 
<a name="l00145"></a>00145
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<a name="l00146"></a>00146                 dataPtr += KPngChunkIdSize;
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   157
 
<a name="l00147"></a>00147
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   158
 
<a name="l00148"></a>00148                 DoProcessIHDRL(dataPtr,chunkLength);
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   159
 
<a name="l00149"></a>00149
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   160
 
<a name="l00150"></a>00150                 dataPtr += KPngIHDRChunkSize + KPngChunkCRCSize;
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<a name="l00151"></a>00151                 }
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   162
 
<a name="l00152"></a>00152
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   163
 
<a name="l00153"></a>00153         <span class="comment">// Process any optional PNG header chunks</span>
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   164
 
<a name="l00154"></a>00154         TRAPD(err, DoProcessInfoL(dataPtr, dataPtrLimit));
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   165
 
<a name="l00155"></a>00155         <span class="keywordflow">if</span> (err != KErrNone)
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diff changeset 
   166
 
<a name="l00156"></a>00156                 {
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   167
 
<a name="l00157"></a>00157                 <span class="keywordflow">if</span> (err == KErrNotFound)
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   168
 
<a name="l00158"></a>00158                         <span class="keywordflow">return</span> EFrameComplete;
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   169
 
<a name="l00159"></a>00159
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<a name="l00160"></a>00160                 User::Leave(err); <span class="comment">// A real error occured</span>
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<a name="l00161"></a>00161                 }
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diff changeset 
   172
 
<a name="l00162"></a>00162
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   173
 
<a name="l00163"></a>00163         <span class="comment">// Having read the header, can initialise the frame information</span>
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   174
 
<a name="l00164"></a>00164         aData.Shift(dataPtr - startDataPtr);
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diff changeset 
   175
 
<a name="l00165"></a>00165
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   176
 
<a name="l00166"></a>00166         iFrameInfo-&gt;iFrameCoordsInPixels.SetRect(TPoint(0,0),iImageInfo.iSize);
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   177
 
<a name="l00167"></a>00167         iFrameInfo-&gt;iOverallSizeInPixels = iImageInfo.iSize;
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   178
 
<a name="l00168"></a>00168         <span class="keywordflow">if</span> (iImageInfo.iPhysicalPresent &amp;&amp; iImageInfo.iPhysicalUnits == TPngImageInformation::EMeters)
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<a name="l00169"></a>00169                 iFrameInfo-&gt;iFrameSizeInTwips = iImageInfo.iPhysicalSize;
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<a name="l00170"></a>00170         <span class="keywordflow">else</span>
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   181
 
<a name="l00171"></a>00171                 iFrameInfo-&gt;iFrameSizeInTwips.SetSize(0,0);
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   182
 
<a name="l00172"></a>00172
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   183
 
<a name="l00173"></a>00173         iFrameInfo-&gt;iBitsPerPixel = iImageInfo.iBitDepth;
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   184
 
<a name="l00174"></a>00174         <span class="keywordflow">if</span> (iImageInfo.iColorType &amp; TPngImageInformation::EColorUsed)
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   185
 
<a name="l00175"></a>00175                 iFrameInfo-&gt;iBitsPerPixel *= 3;
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   186
 
<a name="l00176"></a>00176
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   187
 
<a name="l00177"></a>00177         iFrameInfo-&gt;iDelay = 0;
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   188
 
<a name="l00178"></a>00178         iFrameInfo-&gt;iFlags = TFrameInfo::ECanDither;
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diff changeset 
   189
 
<a name="l00179"></a>00179
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   190
 
<a name="l00180"></a>00180         <span class="keywordflow">if</span> (iImageInfo.iColorType &amp; (TPngImageInformation::EPaletteUsed | TPngImageInformation::EColorUsed))
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   191
 
<a name="l00181"></a>00181                 iFrameInfo-&gt;iFlags |= TFrameInfo::EColor;
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   192
 
<a name="l00182"></a>00182
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   193
 
<a name="l00183"></a>00183         <span class="keywordflow">if</span> (iImageInfo.iColorType &amp; TPngImageInformation::EAlphaChannelUsed)
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diff changeset 
   194
 
<a name="l00184"></a>00184                 {
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   195
 
<a name="l00185"></a>00185                 iFrameInfo-&gt;iFlags |= TFrameInfo::ETransparencyPossible;
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   196
 
<a name="l00186"></a>00186                 iFrameInfo-&gt;iFlags |= TFrameInfo::EAlphaChannel;
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   197
 
<a name="l00187"></a>00187                 }
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<a name="l00188"></a>00188         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iImageInfo.iTransparencyPresent)
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<a name="l00189"></a>00189                 iFrameInfo-&gt;iFlags |= TFrameInfo::ETransparencyPossible;
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   200
 
<a name="l00190"></a>00190
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   201
 
<a name="l00191"></a>00191         <span class="keywordflow">switch</span> (iFrameInfo-&gt;iBitsPerPixel)
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   202
 
<a name="l00192"></a>00192                 {
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<a name="l00193"></a>00193         <span class="keywordflow">case</span> 1:
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<a name="l00194"></a>00194                 iFrameInfo-&gt;iFrameDisplayMode = EGray2;
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<a name="l00195"></a>00195                 <span class="keywordflow">break</span>;
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   206
 
<a name="l00196"></a>00196
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<a name="l00197"></a>00197         <span class="keywordflow">case</span> 2:
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<a name="l00198"></a>00198                 iFrameInfo-&gt;iFrameDisplayMode = EGray4;
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<a name="l00199"></a>00199                 <span class="keywordflow">break</span>;
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   210
 
<a name="l00200"></a>00200
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<a name="l00201"></a>00201         <span class="keywordflow">case</span> 4:
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<a name="l00202"></a>00202                 iFrameInfo-&gt;iFrameDisplayMode = (iFrameInfo-&gt;iFlags &amp; TFrameInfo::EColor) ? EColor16 : EGray16;
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<a name="l00203"></a>00203                 <span class="keywordflow">break</span>;
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   214
 
<a name="l00204"></a>00204
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   215
 
<a name="l00205"></a>00205         <span class="keywordflow">case</span> 8:
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<a name="l00206"></a>00206                 iFrameInfo-&gt;iFrameDisplayMode = (iFrameInfo-&gt;iFlags &amp; TFrameInfo::EColor) ? EColor256 : EGray256;
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<a name="l00207"></a>00207                 <span class="keywordflow">break</span>;
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   218
 
<a name="l00208"></a>00208
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   219
 
<a name="l00209"></a>00209         <span class="keywordflow">case</span> 12:
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   220
 
<a name="l00210"></a>00210                 iFrameInfo-&gt;iFrameDisplayMode = EColor4K;
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   221
 
<a name="l00211"></a>00211                 <span class="keywordflow">break</span>;
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   222
 
<a name="l00212"></a>00212
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   223
 
<a name="l00213"></a>00213         <span class="keywordflow">case</span> 16:
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   224
 
<a name="l00214"></a>00214                 iFrameInfo-&gt;iFrameDisplayMode = EColor64K;
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   225
 
<a name="l00215"></a>00215                 <span class="keywordflow">break</span>;
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   226
 
<a name="l00216"></a>00216
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   227
 
<a name="l00217"></a>00217         <span class="keywordflow">case</span> 24:
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<a name="l00218"></a>00218                 iFrameInfo-&gt;iFrameDisplayMode = EColor16M;
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<a name="l00219"></a>00219                 <span class="keywordflow">break</span>;
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   230
 
<a name="l00220"></a>00220
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   231
 
<a name="l00221"></a>00221         <span class="keywordflow">default</span>:
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<a name="l00222"></a>00222                 User::Leave(KErrCorrupt);
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<a name="l00223"></a>00223                 }
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   234
 
<a name="l00224"></a>00224
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   235
 
<a name="l00225"></a>00225         <span class="keywordflow">if</span> (iImageInfo.iBackgroundPresent)
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<a name="l00226"></a>00226                 iFrameInfo-&gt;iBackgroundColor = iImageInfo.iBackgroundColor;
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   237
 
<a name="l00227"></a>00227
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<a name="l00228"></a>00228         iFrameInfo-&gt;SetCurrentFrameState(TFrameInfo::EFrameInfoProcessingComplete);
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<a name="l00229"></a>00229         <span class="keywordflow">return</span> EFrameComplete;
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<a name="l00230"></a>00230         }
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   241
 
<a name="l00231"></a>00231
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   242
 
<a name="l00232"></a>00232 <span class="comment">// Called by the framework to process frame data</span>
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   243
 
<a name="l00233"></a>00233 TFrameState CPngReadCodec::ProcessFrameL(TBufPtr8&amp; aSrc)
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   244
 
<a name="l00234"></a>00234         {
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   245
 
<a name="l00235"></a>00235         CImageProcessor*<span class="keyword">const</span> imageProc = ImageProcessor();
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<a name="l00236"></a>00236         CImageProcessor*<span class="keyword">const</span> maskProc = MaskProcessor();
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<a name="l00237"></a>00237
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<a name="l00238"></a>00238         TUint8* startDataPtr = <span class="keyword">const_cast&lt;</span>TUint8*<span class="keyword">&gt;</span>(aSrc.Ptr());
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<a name="l00239"></a>00239         TUint8* dataPtr = startDataPtr;
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<a name="l00240"></a>00240         <span class="keyword">const</span> TUint8* dataPtrLimit = dataPtr + aSrc.Length();
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<a name="l00241"></a>00241         <span class="keywordflow">while</span> (dataPtr &lt; dataPtrLimit)
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   252
 
<a name="l00242"></a>00242                 {
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   253
 
<a name="l00243"></a>00243                 <span class="comment">// If at the end of a PNG chunk</span>
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   254
 
<a name="l00244"></a>00244                 <span class="keywordflow">if</span> (iChunkBytesRemaining == 0)
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   255
 
<a name="l00245"></a>00245                         {
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<a name="l00246"></a>00246                         <span class="keywordflow">if</span> (iChunkId == KPngIDATChunkId) <span class="comment">// Need to skip IDAT chunk CRCs</span>
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   257
 
<a name="l00247"></a>00247                                 {
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<a name="l00248"></a>00248                                 <span class="keywordflow">if</span> (dataPtr + KPngChunkCRCSize + KPngChunkLengthSize + KPngChunkIdSize &gt; dataPtrLimit)
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<a name="l00249"></a>00249                                         <span class="keywordflow">break</span>;
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<a name="l00250"></a>00250
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<a name="l00251"></a>00251                                 dataPtr += KPngChunkCRCSize;
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<a name="l00252"></a>00252                                 }
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<a name="l00253"></a>00253                         <span class="keywordflow">else</span>
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<a name="l00254"></a>00254                                 {
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<a name="l00255"></a>00255                                 <span class="keywordflow">if</span> (dataPtr + KPngChunkLengthSize + KPngChunkIdSize &gt; dataPtrLimit)
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<a name="l00256"></a>00256                                         <span class="keywordflow">break</span>;
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<a name="l00257"></a>00257                                 }
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<a name="l00258"></a>00258
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<a name="l00259"></a>00259                         iChunkBytesRemaining = PtrReadUtil::ReadBigEndianUint32Inc(const_cast&lt;const TUint8*&amp;&gt;(dataPtr));
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<a name="l00260"></a>00260                         iChunkId = TPtr8(dataPtr,KPngChunkIdSize,KPngChunkIdSize);
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<a name="l00261"></a>00261                         dataPtr += KPngChunkIdSize;
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<a name="l00262"></a>00262                         }
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<a name="l00263"></a>00263                 <span class="comment">// Process an image data chunk</span>
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<a name="l00264"></a>00264                 <span class="keywordflow">if</span> (iChunkId == KPngIDATChunkId)
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<a name="l00265"></a>00265                         DoProcessDataL(const_cast&lt;const TUint8*&amp;&gt;(dataPtr),dataPtrLimit);
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<a name="l00266"></a>00266                 <span class="comment">// Process an END chunk -- frame is complete</span>
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<a name="l00267"></a>00267                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iChunkId == KPngIENDChunkId)
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<a name="l00268"></a>00268                         {
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<a name="l00269"></a>00269                         iDecompressor-&gt;InflateL();
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<a name="l00270"></a>00270                         imageProc-&gt;FlushPixels();
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<a name="l00271"></a>00271                         <span class="keywordflow">if</span> (maskProc)
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<a name="l00272"></a>00272                                 maskProc-&gt;FlushPixels();
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<a name="l00273"></a>00273                         <span class="keywordflow">return</span> EFrameComplete;
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<a name="l00274"></a>00274                         }
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<a name="l00275"></a>00275                 <span class="keywordflow">else</span>
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<a name="l00276"></a>00276                 <span class="comment">// Skip other chunks</span>
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<a name="l00277"></a>00277                         {
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<a name="l00278"></a>00278                         TInt bytesLeft = dataPtrLimit - dataPtr;
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<a name="l00279"></a>00279                         <span class="keywordflow">if</span> (bytesLeft &gt;= iChunkBytesRemaining + KPngChunkCRCSize)
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<a name="l00280"></a>00280                                 {
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<a name="l00281"></a>00281                                 dataPtr += iChunkBytesRemaining + KPngChunkCRCSize;
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<a name="l00282"></a>00282                                 iChunkBytesRemaining = 0;
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<a name="l00283"></a>00283                                 }
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<a name="l00284"></a>00284                         <span class="keywordflow">else</span>
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<a name="l00285"></a>00285                                 {
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<a name="l00286"></a>00286                                 dataPtr += bytesLeft;
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<a name="l00287"></a>00287                                 iChunkBytesRemaining -= bytesLeft;
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<a name="l00288"></a>00288                                 }
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<a name="l00289"></a>00289                         }
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<a name="l00290"></a>00290                 }
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<a name="l00291"></a>00291
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<a name="l00292"></a>00292         aSrc.Shift(dataPtr - startDataPtr);
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<a name="l00293"></a>00293         <span class="keywordflow">return</span> EFrameIncomplete;
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<a name="l00294"></a>00294         }
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<a name="l00295"></a>00295
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<a name="l00296"></a>00296 <span class="comment">// Process any optional PNG header chunks</span>
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<a name="l00297"></a>00297 <span class="keywordtype">void</span> CPngReadCodec::DoProcessInfoL(<span class="keyword">const</span> TUint8*&amp; aDataPtr,<span class="keyword">const</span> TUint8* aDataPtrLimit)
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<a name="l00298"></a>00298         {
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<a name="l00299"></a>00299         FOREVER
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<a name="l00300"></a>00300                 {
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<a name="l00301"></a>00301                 <span class="keywordflow">if</span> (aDataPtr + KPngChunkLengthSize + KPngChunkIdSize &gt; aDataPtrLimit) <span class="comment">// Check there is enough data to read the chunk length</span>
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<a name="l00302"></a>00302                         User::Leave(KErrUnderflow);
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<a name="l00303"></a>00303
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<a name="l00304"></a>00304                 TInt chunkLength = PtrReadUtil::ReadBigEndianUint32Inc(aDataPtr);
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<a name="l00305"></a>00305                 TPtrC8 chunkId (&amp;aDataPtr[0],KPngChunkIdSize);
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<a name="l00306"></a>00306
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diff changeset 
   317
 
<a name="l00307"></a>00307                 <span class="keywordflow">if</span> (chunkId == KPngIDATChunkId)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   318
 
<a name="l00308"></a>00308                         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   319
 
<a name="l00309"></a>00309                         aDataPtr -= KPngChunkLengthSize; <span class="comment">// Rewind to start of chunkLength</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   320
 
<a name="l00310"></a>00310                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   321
 
<a name="l00311"></a>00311                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   322
 
<a name="l00312"></a>00312
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   323
 
<a name="l00313"></a>00313                 <span class="keywordflow">if</span> (aDataPtr + KPngChunkIdSize + chunkLength + KPngChunkCRCSize &gt; aDataPtrLimit) <span class="comment">// Check there is enough data to read the whole chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   324
 
<a name="l00314"></a>00314                         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   325
 
<a name="l00315"></a>00315                         aDataPtr -= KPngChunkLengthSize; <span class="comment">// Rewind to start of chunkLength</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   326
 
<a name="l00316"></a>00316                         User::Leave(KErrUnderflow);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   327
 
<a name="l00317"></a>00317                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   328
 
<a name="l00318"></a>00318
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   329
 
<a name="l00319"></a>00319                 aDataPtr += KPngChunkIdSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   330
 
<a name="l00320"></a>00320
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   331
 
<a name="l00321"></a>00321                 <span class="keywordflow">if</span> (chunkId == KPngPLTEChunkId)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   332
 
<a name="l00322"></a>00322                         DoProcessPLTEL(aDataPtr,chunkLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   333
 
<a name="l00323"></a>00323                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (chunkId == KPngbKGDChunkId)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   334
 
<a name="l00324"></a>00324                         DoProcessbKGDL(aDataPtr,chunkLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   335
 
<a name="l00325"></a>00325                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (chunkId == KPngpHYsChunkId)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   336
 
<a name="l00326"></a>00326                         DoProcesspHYsL(aDataPtr,chunkLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   337
 
<a name="l00327"></a>00327                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (chunkId == KPngtRNSChunkId)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   338
 
<a name="l00328"></a>00328                         DoProcesstRNSL(aDataPtr,chunkLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   339
 
<a name="l00329"></a>00329                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (chunkId == KPngIHDRChunkId || chunkId == KPngIENDChunkId)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   340
 
<a name="l00330"></a>00330                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   341
 
<a name="l00331"></a>00331
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   342
 
<a name="l00332"></a>00332                 aDataPtr += chunkLength;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   343
 
<a name="l00333"></a>00333                 PtrReadUtil::ReadBigEndianUint32Inc(aDataPtr); <span class="comment">// Skip crc value</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   344
 
<a name="l00334"></a>00334                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   345
 
<a name="l00335"></a>00335         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   346
 
<a name="l00336"></a>00336
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   347
 
<a name="l00337"></a>00337 <span class="comment">// Process the mandatory PNG header chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   348
 
<a name="l00338"></a>00338 <span class="keywordtype">void</span> CPngReadCodec::DoProcessIHDRL(<span class="keyword">const</span> TUint8* aDataPtr,TInt aChunkLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   349
 
<a name="l00339"></a>00339         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   350
 
<a name="l00340"></a>00340         <span class="keywordflow">if</span> (aChunkLength != KPngIHDRChunkSize)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   351
 
<a name="l00341"></a>00341                 User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   352
 
<a name="l00342"></a>00342
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   353
 
<a name="l00343"></a>00343         iImageInfo.iSize.iWidth = PtrReadUtil::ReadBigEndianUint32Inc(aDataPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   354
 
<a name="l00344"></a>00344         iImageInfo.iSize.iHeight = PtrReadUtil::ReadBigEndianUint32Inc(aDataPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   355
 
<a name="l00345"></a>00345         iImageInfo.iBitDepth = aDataPtr[0];
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   356
 
<a name="l00346"></a>00346         iImageInfo.iColorType = TPngImageInformation::TColorType(aDataPtr[1]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   357
 
<a name="l00347"></a>00347         iImageInfo.iCompressionMethod = TPngImageInformation::TCompressionMethod(aDataPtr[2]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   358
 
<a name="l00348"></a>00348         iImageInfo.iFilterMethod = TPngImageInformation::TFilterMethod(aDataPtr[3]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   359
 
<a name="l00349"></a>00349         iImageInfo.iInterlaceMethod = TPngImageInformation::TInterlaceMethod(aDataPtr[4]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   360
 
<a name="l00350"></a>00350
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   361
 
<a name="l00351"></a>00351         <span class="comment">// Check is one of the PNG formats we support</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   362
 
<a name="l00352"></a>00352         <span class="keywordflow">if</span> (iImageInfo.iSize.iWidth &lt; 1 || iImageInfo.iSize.iHeight &lt; 1
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   363
 
<a name="l00353"></a>00353                 || iImageInfo.iCompressionMethod != TPngImageInformation::EDeflateInflate32K
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   364
 
<a name="l00354"></a>00354                 || iImageInfo.iFilterMethod != TPngImageInformation::EAdaptiveFiltering
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   365
 
<a name="l00355"></a>00355                 || (iImageInfo.iInterlaceMethod != TPngImageInformation::ENoInterlace &amp;&amp;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   366
 
<a name="l00356"></a>00356                         iImageInfo.iInterlaceMethod != TPngImageInformation::EAdam7Interlace))
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   367
 
<a name="l00357"></a>00357                 User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   368
 
<a name="l00358"></a>00358         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   369
 
<a name="l00359"></a>00359
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   370
 
<a name="l00360"></a>00360 <span class="comment">// Process a PNG PLTE (palette) chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   371
 
<a name="l00361"></a>00361 <span class="keywordtype">void</span> CPngReadCodec::DoProcessPLTEL(<span class="keyword">const</span> TUint8* aDataPtr,TInt aChunkLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   372
 
<a name="l00362"></a>00362         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   373
 
<a name="l00363"></a>00363         <span class="keywordflow">if</span> (aChunkLength % 3 != 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   374
 
<a name="l00364"></a>00364                 User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   375
 
<a name="l00365"></a>00365
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   376
 
<a name="l00366"></a>00366         iImageInfo.iPalettePresent = ETrue;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   377
 
<a name="l00367"></a>00367
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   378
 
<a name="l00368"></a>00368         <span class="keyword">const</span> TUint8* dataPtrLimit = aDataPtr + aChunkLength;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   379
 
<a name="l00369"></a>00369         TRgb* palettePtr = iImageInfo.iPalette;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   380
 
<a name="l00370"></a>00370
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   381
 
<a name="l00371"></a>00371         <span class="keywordflow">while</span> (aDataPtr &lt; dataPtrLimit)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   382
 
<a name="l00372"></a>00372                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   383
 
<a name="l00373"></a>00373                 *palettePtr++ = TRgb(aDataPtr[0],aDataPtr[1],aDataPtr[2]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   384
 
<a name="l00374"></a>00374                 aDataPtr += 3;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   385
 
<a name="l00375"></a>00375                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   386
 
<a name="l00376"></a>00376         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   387
 
<a name="l00377"></a>00377
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   388
 
<a name="l00378"></a>00378 <span class="comment">// Process a PNG bKGD (background color) chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   389
 
<a name="l00379"></a>00379 <span class="keywordtype">void</span> CPngReadCodec::DoProcessbKGDL(<span class="keyword">const</span> TUint8* aDataPtr,TInt aChunkLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   390
 
<a name="l00380"></a>00380         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   391
 
<a name="l00381"></a>00381         iImageInfo.iBackgroundPresent = ETrue;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   392
 
<a name="l00382"></a>00382
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   393
 
<a name="l00383"></a>00383         <span class="keywordflow">if</span> (iImageInfo.iColorType == TPngImageInformation::EIndexedColor) <span class="comment">// 3</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   394
 
<a name="l00384"></a>00384                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   395
 
<a name="l00385"></a>00385                 <span class="keywordflow">if</span> (aChunkLength &lt; 1)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   396
 
<a name="l00386"></a>00386                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   397
 
<a name="l00387"></a>00387
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   398
 
<a name="l00388"></a>00388                 iImageInfo.iBackgroundColor = iImageInfo.iPalette[aDataPtr[0]];
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   399
 
<a name="l00389"></a>00389                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   400
 
<a name="l00390"></a>00390         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iImageInfo.iColorType &amp; TPngImageInformation::EMonochrome) <span class="comment">// 0 &amp; 4</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   401
 
<a name="l00391"></a>00391                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   402
 
<a name="l00392"></a>00392                 <span class="keywordflow">if</span> (aChunkLength &lt; 2)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   403
 
<a name="l00393"></a>00393                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   404
 
<a name="l00394"></a>00394
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   405
 
<a name="l00395"></a>00395                 TInt grayLevel = PtrReadUtil::ReadBigEndianInt16(aDataPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   406
 
<a name="l00396"></a>00396                 ASSERT(iImageInfo.iBitDepth&lt;8);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   407
 
<a name="l00397"></a>00397                 grayLevel &lt;&lt;= (7-iImageInfo.iBitDepth);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   408
 
<a name="l00398"></a>00398                 iImageInfo.iBackgroundColor = TRgb::Gray256(grayLevel);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   409
 
<a name="l00399"></a>00399                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   410
 
<a name="l00400"></a>00400         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iImageInfo.iColorType &amp; TPngImageInformation::EColorUsed) <span class="comment">// 2 &amp; 6</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   411
 
<a name="l00401"></a>00401                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   412
 
<a name="l00402"></a>00402                 <span class="keywordflow">if</span> (aChunkLength &lt; 6)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   413
 
<a name="l00403"></a>00403                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   414
 
<a name="l00404"></a>00404
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   415
 
<a name="l00405"></a>00405                 TInt red = PtrReadUtil::ReadBigEndianInt16(&amp;aDataPtr[0]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   416
 
<a name="l00406"></a>00406                 TInt green = PtrReadUtil::ReadBigEndianInt16(&amp;aDataPtr[2]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   417
 
<a name="l00407"></a>00407                 TInt blue = PtrReadUtil::ReadBigEndianInt16(&amp;aDataPtr[4]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   418
 
<a name="l00408"></a>00408                 ASSERT (iImageInfo.iBitDepth&lt;8);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   419
 
<a name="l00409"></a>00409                 <span class="keyword">const</span> TInt offset = 7-iImageInfo.iBitDepth;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   420
 
<a name="l00410"></a>00410                 red &lt;&lt;= offset;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   421
 
<a name="l00411"></a>00411                 green &lt;&lt;= offset;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   422
 
<a name="l00412"></a>00412                 blue &lt;&lt;= offset;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   423
 
<a name="l00413"></a>00413                 iImageInfo.iBackgroundColor = TRgb(red,green,blue);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   424
 
<a name="l00414"></a>00414                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   425
 
<a name="l00415"></a>00415         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   426
 
<a name="l00416"></a>00416
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   427
 
<a name="l00417"></a>00417 <span class="comment">// Process a PNG pHYs (Physical pixel dimensions) chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   428
 
<a name="l00418"></a>00418 <span class="keywordtype">void</span> CPngReadCodec::DoProcesspHYsL(<span class="keyword">const</span> TUint8* aDataPtr,TInt aChunkLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   429
 
<a name="l00419"></a>00419         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   430
 
<a name="l00420"></a>00420         <span class="keywordflow">if</span> (aChunkLength != KPngpHYsChunkSize)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   431
 
<a name="l00421"></a>00421                 User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   432
 
<a name="l00422"></a>00422
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   433
 
<a name="l00423"></a>00423         iImageInfo.iPhysicalUnits = TPngImageInformation::TPhysicalUnits(aDataPtr[8]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   434
 
<a name="l00424"></a>00424
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   435
 
<a name="l00425"></a>00425         <span class="keywordflow">if</span> (iImageInfo.iPhysicalUnits == TPngImageInformation::EMeters)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   436
 
<a name="l00426"></a>00426                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   437
 
<a name="l00427"></a>00427                 iImageInfo.iPhysicalPresent = ETrue;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   438
 
<a name="l00428"></a>00428
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   439
 
<a name="l00429"></a>00429                 TInt horzPixelsPerMeter = PtrReadUtil::ReadBigEndianUint32Inc(aDataPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   440
 
<a name="l00430"></a>00430                 TInt vertPixelsPerMeter = PtrReadUtil::ReadBigEndianUint32Inc(aDataPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   441
 
<a name="l00431"></a>00431
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   442
 
<a name="l00432"></a>00432                 <span class="keywordflow">if</span> (horzPixelsPerMeter &gt; 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   443
 
<a name="l00433"></a>00433                         iImageInfo.iPhysicalSize.iWidth = iImageInfo.iSize.iWidth * KTwipsPerMeter / horzPixelsPerMeter;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   444
 
<a name="l00434"></a>00434                 <span class="keywordflow">if</span> (vertPixelsPerMeter &gt; 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   445
 
<a name="l00435"></a>00435                         iImageInfo.iPhysicalSize.iHeight = iImageInfo.iSize.iHeight * KTwipsPerMeter / vertPixelsPerMeter;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   446
 
<a name="l00436"></a>00436                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   447
 
<a name="l00437"></a>00437         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   448
 
<a name="l00438"></a>00438
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   449
 
<a name="l00439"></a>00439 <span class="comment">// Process a PNG tRNS (Transparency) chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   450
 
<a name="l00440"></a>00440 <span class="keywordtype">void</span> CPngReadCodec::DoProcesstRNSL(<span class="keyword">const</span> TUint8* aDataPtr,TInt aChunkLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   451
 
<a name="l00441"></a>00441         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   452
 
<a name="l00442"></a>00442         iImageInfo.iTransparencyPresent = ETrue;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   453
 
<a name="l00443"></a>00443
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   454
 
<a name="l00444"></a>00444         <span class="keywordflow">if</span> (iImageInfo.iColorType == TPngImageInformation::EIndexedColor) <span class="comment">// 3</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   455
 
<a name="l00445"></a>00445                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   456
 
<a name="l00446"></a>00446                 <span class="keywordflow">if</span> (aChunkLength &lt; 1)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   457
 
<a name="l00447"></a>00447                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   458
 
<a name="l00448"></a>00448
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   459
 
<a name="l00449"></a>00449                 Mem::Copy(iImageInfo.iTransparencyValue,aDataPtr,aChunkLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   460
 
<a name="l00450"></a>00450                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   461
 
<a name="l00451"></a>00451         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iImageInfo.iColorType == TPngImageInformation::EGrayscale) <span class="comment">// 0</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   462
 
<a name="l00452"></a>00452                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   463
 
<a name="l00453"></a>00453                 <span class="keywordflow">if</span> (aChunkLength &lt; 2)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   464
 
<a name="l00454"></a>00454                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   465
 
<a name="l00455"></a>00455
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   466
 
<a name="l00456"></a>00456                 iImageInfo.iTransparentGray = TUint16((aDataPtr[0] &lt;&lt; 8) | aDataPtr[1]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   467
 
<a name="l00457"></a>00457                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   468
 
<a name="l00458"></a>00458         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (iImageInfo.iColorType == TPngImageInformation::EDirectColor) <span class="comment">// 2</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   469
 
<a name="l00459"></a>00459                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   470
 
<a name="l00460"></a>00460                 <span class="keywordflow">if</span> (aChunkLength &lt; 6)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   471
 
<a name="l00461"></a>00461                         User::Leave(KErrCorrupt);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   472
 
<a name="l00462"></a>00462
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   473
 
<a name="l00463"></a>00463                 iImageInfo.iTransparentRed = TUint16((aDataPtr[0] &lt;&lt; 8) | aDataPtr[1]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   474
 
<a name="l00464"></a>00464                 iImageInfo.iTransparentGreen = TUint16((aDataPtr[2] &lt;&lt; 8) | aDataPtr[3]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   475
 
<a name="l00465"></a>00465                 iImageInfo.iTransparentBlue = TUint16((aDataPtr[4] &lt;&lt; 8) | aDataPtr[5]);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   476
 
<a name="l00466"></a>00466                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   477
 
<a name="l00467"></a>00467         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   478
 
<a name="l00468"></a>00468
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   479
 
<a name="l00469"></a>00469 <span class="comment">// Process a PNG image data</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   480
 
<a name="l00470"></a>00470 <span class="keywordtype">void</span> CPngReadCodec::DoProcessDataL(<span class="keyword">const</span> TUint8*&amp; aDataPtr,<span class="keyword">const</span> TUint8* aDataPtrLimit)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   481
 
<a name="l00471"></a>00471         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   482
 
<a name="l00472"></a>00472         <span class="comment">// Data is passed to the decompressor</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   483
 
<a name="l00473"></a>00473         TInt bytesToProcess = Min(aDataPtrLimit - aDataPtr,iChunkBytesRemaining);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   484
 
<a name="l00474"></a>00474         iDataDes.Set(aDataPtr,bytesToProcess);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   485
 
<a name="l00475"></a>00475         iDecompressor-&gt;SetInput(iDataDes);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   486
 
<a name="l00476"></a>00476
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   487
 
<a name="l00477"></a>00477         <span class="keywordflow">while</span> (iDecompressor-&gt;AvailIn() &gt; 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   488
 
<a name="l00478"></a>00478                 iDecompressor-&gt;InflateL();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   489
 
<a name="l00479"></a>00479
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   490
 
<a name="l00480"></a>00480         aDataPtr += bytesToProcess;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   491
 
<a name="l00481"></a>00481         iChunkBytesRemaining -= bytesToProcess;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   492
 
<a name="l00482"></a>00482         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   493
 
<a name="l00483"></a>00483
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   494
 
<a name="l00484"></a>00484 <span class="comment">// From MEZBufferManager: manage decompressor stream</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   495
 
<a name="l00485"></a>00485 <span class="keywordtype">void</span> CPngReadCodec::InitializeL(CEZZStream&amp; aZStream)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   496
 
<a name="l00486"></a>00486         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   497
 
<a name="l00487"></a>00487         aZStream.SetOutput(iDecoder-&gt;FirstBuffer());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   498
 
<a name="l00488"></a>00488         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   499
 
<a name="l00489"></a>00489
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   500
 
<a name="l00490"></a>00490 <span class="keywordtype">void</span> CPngReadCodec::NeedInputL(CEZZStream&amp; <span class="comment">/*aZStream*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   501
 
<a name="l00491"></a>00491         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   502
 
<a name="l00492"></a>00492         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   503
 
<a name="l00493"></a>00493
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   504
 
<a name="l00494"></a>00494 <span class="keywordtype">void</span> CPngReadCodec::NeedOutputL(CEZZStream&amp; aZStream)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   505
 
<a name="l00495"></a>00495         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   506
 
<a name="l00496"></a>00496         aZStream.SetOutput(iDecoder-&gt;DecodeL());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   507
 
<a name="l00497"></a>00497         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   508
 
<a name="l00498"></a>00498
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   509
 
<a name="l00499"></a>00499 <span class="keywordtype">void</span> CPngReadCodec::FinalizeL(CEZZStream&amp; <span class="comment">/*aZStream*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   510
 
<a name="l00500"></a>00500         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   511
 
<a name="l00501"></a>00501         iDecoder-&gt;DecodeL();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   512
 
<a name="l00502"></a>00502         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   513
 
<a name="l00503"></a>00503
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   514
 
<a name="l00504"></a>00504
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   515
 
<a name="l00505"></a>00505
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   516
 
<a name="l00506"></a>00506 <span class="comment">//</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   517
 
<a name="l00507"></a>00507 <span class="comment">// CPngWriteCodec: writes a PNG image</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   518
 
<a name="l00508"></a>00508 <span class="comment">//</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   519
 
<a name="l00509"></a>00509
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   520
 
<a name="l00510"></a>00510
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   521
 
<a name="l00511"></a>00511 CPngWriteCodec::CPngWriteCodec(TInt aBpp, TBool aColor, TBool aPaletted, TInt aCompressionLevel)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   522
 
<a name="l00512"></a>00512         : iCompressionLevel(aCompressionLevel), iCompressorPtr(NULL, 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   523
 
<a name="l00513"></a>00513         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   524
 
<a name="l00514"></a>00514         <span class="comment">// Set bpp</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   525
 
<a name="l00515"></a>00515         iImageInfo.iBitsPerPixel = aBpp;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   526
 
<a name="l00516"></a>00516         <span class="keywordflow">switch</span> (aBpp)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   527
 
<a name="l00517"></a>00517                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   528
 
<a name="l00518"></a>00518                 <span class="keywordflow">case</span> 1:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   529
 
<a name="l00519"></a>00519                         iImageInfo.iBitDepth = 1;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   530
 
<a name="l00520"></a>00520                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   531
 
<a name="l00521"></a>00521                 <span class="keywordflow">case</span> 2:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   532
 
<a name="l00522"></a>00522                         iImageInfo.iBitDepth = 2;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   533
 
<a name="l00523"></a>00523                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   534
 
<a name="l00524"></a>00524                 <span class="keywordflow">case</span> 4:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   535
 
<a name="l00525"></a>00525                         iImageInfo.iBitDepth = 4;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   536
 
<a name="l00526"></a>00526                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   537
 
<a name="l00527"></a>00527                 <span class="keywordflow">case</span> 8:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   538
 
<a name="l00528"></a>00528                 <span class="keywordflow">case</span> 24:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   539
 
<a name="l00529"></a>00529                         iImageInfo.iBitDepth = 8;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   540
 
<a name="l00530"></a>00530                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   541
 
<a name="l00531"></a>00531                 <span class="keywordflow">default</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   542
 
<a name="l00532"></a>00532                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   543
 
<a name="l00533"></a>00533                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   544
 
<a name="l00534"></a>00534
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   545
 
<a name="l00535"></a>00535         <span class="comment">// Set color type</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   546
 
<a name="l00536"></a>00536         <span class="keywordflow">if</span> (aColor &amp;&amp; aPaletted)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   547
 
<a name="l00537"></a>00537                 iImageInfo.iColorType = TPngImageInformation::EIndexedColor;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   548
 
<a name="l00538"></a>00538         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aColor)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   549
 
<a name="l00539"></a>00539                 iImageInfo.iColorType = TPngImageInformation::EDirectColor;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   550
 
<a name="l00540"></a>00540         <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   551
 
<a name="l00541"></a>00541                 iImageInfo.iColorType = TPngImageInformation::EGrayscale;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   552
 
<a name="l00542"></a>00542         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   553
 
<a name="l00543"></a>00543
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   554
 
<a name="l00544"></a>00544 CPngWriteCodec::~CPngWriteCodec()
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   555
 
<a name="l00545"></a>00545         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   556
 
<a name="l00546"></a>00546         <span class="keyword">delete</span> iCompressor;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   557
 
<a name="l00547"></a>00547         <span class="keyword">delete</span> iEncoder;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   558
 
<a name="l00548"></a>00548         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   559
 
<a name="l00549"></a>00549
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   560
 
<a name="l00550"></a>00550 <span class="comment">// Called by framework at start of conversion operation</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   561
 
<a name="l00551"></a>00551 <span class="keywordtype">void</span> CPngWriteCodec::InitFrameL(TBufPtr8&amp; aDst, <span class="keyword">const</span> CFbsBitmap&amp; aSource)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   562
 
<a name="l00552"></a>00552         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   563
 
<a name="l00553"></a>00553         <span class="keywordflow">if</span> (aDst.Length() == 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   564
 
<a name="l00554"></a>00554                 User::Leave(KErrArgument);      <span class="comment">// Not enough length for anything</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   565
 
<a name="l00555"></a>00555
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   566
 
<a name="l00556"></a>00556         SetSource(&amp;aSource);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   567
 
<a name="l00557"></a>00557         iDestStartPtr = <span class="keyword">const_cast&lt;</span>TUint8*<span class="keyword">&gt;</span>(aDst.Ptr());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   568
 
<a name="l00558"></a>00558         iDestPtr = iDestStartPtr;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   569
 
<a name="l00559"></a>00559         iDestPtrLimit = iDestPtr + aDst.MaxLength();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   570
 
<a name="l00560"></a>00560
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   571
 
<a name="l00561"></a>00561         <span class="comment">// Set image information</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   572
 
<a name="l00562"></a>00562         <span class="keyword">const</span> SEpocBitmapHeader&amp; header = aSource.Header();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   573
 
<a name="l00563"></a>00563         iImageInfo.iSize = header.iSizeInPixels;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   574
 
<a name="l00564"></a>00564
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   575
 
<a name="l00565"></a>00565         <span class="keywordflow">switch</span> (iImageInfo.iBitDepth)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   576
 
<a name="l00566"></a>00566                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   577
 
<a name="l00567"></a>00567                 <span class="keywordflow">case</span> 1:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   578
 
<a name="l00568"></a>00568                 <span class="keywordflow">case</span> 2:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   579
 
<a name="l00569"></a>00569                 <span class="keywordflow">case</span> 4:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   580
 
<a name="l00570"></a>00570                         <span class="keywordflow">if</span> (iImageInfo.iColorType == TPngImageInformation::EDirectColor)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   581
 
<a name="l00571"></a>00571                                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   582
 
<a name="l00572"></a>00572                                 <span class="comment">// Bit depths 1, 2 and 4 don&#39;t support RGB colour (color mode 2)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   583
 
<a name="l00573"></a>00573                                 <span class="comment">// Must use paletted colour or greyscale</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   584
 
<a name="l00574"></a>00574                                 User::Leave(KErrNotSupported);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   585
 
<a name="l00575"></a>00575                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   586
 
<a name="l00576"></a>00576                                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   587
 
<a name="l00577"></a>00577                         <span class="comment">// fall through to case 8</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   588
 
<a name="l00578"></a>00578                 <span class="keywordflow">case</span> 8:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   589
 
<a name="l00579"></a>00579                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   590
 
<a name="l00580"></a>00580                 <span class="keywordflow">default</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   591
 
<a name="l00581"></a>00581                         User::Leave(KErrNotSupported);  <span class="comment">// unsupported bit depth</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   592
 
<a name="l00582"></a>00582                         <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   593
 
<a name="l00583"></a>00583                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   594
 
<a name="l00584"></a>00584
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   595
 
<a name="l00585"></a>00585         iImageInfo.iCompressionMethod = TPngImageInformation::EDeflateInflate32K;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   596
 
<a name="l00586"></a>00586         iImageInfo.iFilterMethod = TPngImageInformation::EAdaptiveFiltering;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   597
 
<a name="l00587"></a>00587         iImageInfo.iInterlaceMethod = TPngImageInformation::ENoInterlace;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   598
 
<a name="l00588"></a>00588
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   599
 
<a name="l00589"></a>00589         <span class="comment">// Create encoder</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   600
 
<a name="l00590"></a>00590         <span class="keywordflow">if</span> (iEncoder)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   601
 
<a name="l00591"></a>00591                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   602
 
<a name="l00592"></a>00592                 <span class="keyword">delete</span> iEncoder;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   603
 
<a name="l00593"></a>00593                 iEncoder = NULL;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   604
 
<a name="l00594"></a>00594                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   605
 
<a name="l00595"></a>00595         iEncoder = CPngWriteSubCodec::NewL(iImageInfo, &amp;aSource);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   606
 
<a name="l00596"></a>00596
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   607
 
<a name="l00597"></a>00597         <span class="comment">// Create compressor</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   608
 
<a name="l00598"></a>00598         <span class="keywordflow">if</span> (iCompressor)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   609
 
<a name="l00599"></a>00599                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   610
 
<a name="l00600"></a>00600                 <span class="keyword">delete</span> iCompressor;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   611
 
<a name="l00601"></a>00601                 iCompressor = NULL;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   612
 
<a name="l00602"></a>00602                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   613
 
<a name="l00603"></a>00603         iCompressor = CEZCompressor::NewL(*<span class="keyword">this</span>, iCompressionLevel);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   614
 
<a name="l00604"></a>00604
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   615
 
<a name="l00605"></a>00605         <span class="comment">// Initial encoder state</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   616
 
<a name="l00606"></a>00606         <span class="keywordflow">if</span> (iImageInfo.iColorType == TPngImageInformation::EIndexedColor)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   617
 
<a name="l00607"></a>00607                 iEncoderState = EPngWritePLTE;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   618
 
<a name="l00608"></a>00608         <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   619
 
<a name="l00609"></a>00609                 iEncoderState = EPngDeflate;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   620
 
<a name="l00610"></a>00610         iCallAgain = ETrue;             <span class="comment">// to make sure we call DeflateL</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   621
 
<a name="l00611"></a>00611
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   622
 
<a name="l00612"></a>00612         <span class="comment">// Write header</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   623
 
<a name="l00613"></a>00613         User::LeaveIfError(WriteHeaderChunk(aDst));
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   624
 
<a name="l00614"></a>00614         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   625
 
<a name="l00615"></a>00615
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   626
 
<a name="l00616"></a>00616 <span class="comment">// Called by the framework to process frame data</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   627
 
<a name="l00617"></a>00617 TFrameState CPngWriteCodec::ProcessFrameL(TBufPtr8&amp; aDst)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   628
 
<a name="l00618"></a>00618         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   629
 
<a name="l00619"></a>00619         <span class="keywordflow">if</span> (aDst.Length() == 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   630
 
<a name="l00620"></a>00620                 User::Leave(KErrArgument);      <span class="comment">// Not enough length for anything</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   631
 
<a name="l00621"></a>00621
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   632
 
<a name="l00622"></a>00622         TFrameState state = EFrameIncomplete;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   633
 
<a name="l00623"></a>00623         iDestStartPtr = <span class="keyword">const_cast&lt;</span>TUint8*<span class="keyword">&gt;</span>(aDst.Ptr());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   634
 
<a name="l00624"></a>00624         iDestPtr = iDestStartPtr;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   635
 
<a name="l00625"></a>00625         iDestPtrLimit = iDestPtr + aDst.MaxLength();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   636
 
<a name="l00626"></a>00626
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   637
 
<a name="l00627"></a>00627         <span class="comment">// Set return buffer length to 0 initially</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   638
 
<a name="l00628"></a>00628         aDst.SetLength(0);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   639
 
<a name="l00629"></a>00629
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   640
 
<a name="l00630"></a>00630         <span class="keywordflow">while</span> (aDst.Length() == 0 &amp;&amp; state != EFrameComplete)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   641
 
<a name="l00631"></a>00631                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   642
 
<a name="l00632"></a>00632                 <span class="comment">// Loop round until we have some data to return or</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   643
 
<a name="l00633"></a>00633                 <span class="comment">// the image is encoded</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   644
 
<a name="l00634"></a>00634                 <span class="keywordflow">switch</span> (iEncoderState)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   645
 
<a name="l00635"></a>00635                         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   646
 
<a name="l00636"></a>00636                         <span class="keywordflow">case</span> EPngWritePLTE:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   647
 
<a name="l00637"></a>00637                                 WritePLTEChunk(aDst);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   648
 
<a name="l00638"></a>00638                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   649
 
<a name="l00639"></a>00639                         <span class="keywordflow">case</span> EPngDeflate:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   650
 
<a name="l00640"></a>00640                                 DeflateEncodedDataL(aDst, state);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   651
 
<a name="l00641"></a>00641                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   652
 
<a name="l00642"></a>00642                         <span class="keywordflow">case</span> EPngWriteIDAT:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   653
 
<a name="l00643"></a>00643                                 WriteIDATChunk(aDst);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   654
 
<a name="l00644"></a>00644                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   655
 
<a name="l00645"></a>00645                         <span class="keywordflow">case</span> EPngFlush:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   656
 
<a name="l00646"></a>00646                                 FlushCompressedDataL(aDst, state);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   657
 
<a name="l00647"></a>00647                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   658
 
<a name="l00648"></a>00648                         <span class="keywordflow">case</span> EPngEndChunk:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   659
 
<a name="l00649"></a>00649                                 WriteEndChunk(aDst);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   660
 
<a name="l00650"></a>00650                                 state = EFrameComplete;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   661
 
<a name="l00651"></a>00651                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   662
 
<a name="l00652"></a>00652                         <span class="keywordflow">default</span>:
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   663
 
<a name="l00653"></a>00653                                 <span class="keywordflow">break</span>;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   664
 
<a name="l00654"></a>00654                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   665
 
<a name="l00655"></a>00655                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   666
 
<a name="l00656"></a>00656
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   667
 
<a name="l00657"></a>00657         <span class="keywordflow">return</span> state;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   668
 
<a name="l00658"></a>00658         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   669
 
<a name="l00659"></a>00659
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   670
 
<a name="l00660"></a>00660 <span class="comment">// Write a compressed image data chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   671
 
<a name="l00661"></a>00661 <span class="keywordtype">void</span> CPngWriteCodec::DeflateEncodedDataL(TBufPtr8&amp; aDst, TFrameState&amp; <span class="comment">/*aState*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   672
 
<a name="l00662"></a>00662         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   673
 
<a name="l00663"></a>00663         <span class="comment">// Set ptr for compressed data</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   674
 
<a name="l00664"></a>00664         <span class="keyword">const</span> TInt dataLength = aDst.MaxLength() - KPngChunkLengthSize - KPngChunkIdSize - KPngChunkCRCSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   675
 
<a name="l00665"></a>00665         ASSERT(dataLength &gt; 0);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   676
 
<a name="l00666"></a>00666         iCompressorPtr.Set(iDestPtr + KPngChunkIdSize + KPngChunkLengthSize, dataLength, dataLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   677
 
<a name="l00667"></a>00667
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   678
 
<a name="l00668"></a>00668         <span class="comment">// Initialise input/output for compressor</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   679
 
<a name="l00669"></a>00669         iCompressor-&gt;SetInput(iEncoder-&gt;EncodeL(iScanline));
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   680
 
<a name="l00670"></a>00670         iScanline++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   681
 
<a name="l00671"></a>00671         iCompressor-&gt;SetOutput(iCompressorPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   682
 
<a name="l00672"></a>00672
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   683
 
<a name="l00673"></a>00673         <span class="keywordflow">while</span> ((iEncoderState == EPngDeflate) &amp;&amp; iCallAgain)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   684
 
<a name="l00674"></a>00674                 iCallAgain = iCompressor-&gt;DeflateL();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   685
 
<a name="l00675"></a>00675
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   686
 
<a name="l00676"></a>00676         <span class="comment">// Write the IDAT chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   687
 
<a name="l00677"></a>00677         WriteIDATChunk(aDst);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   688
 
<a name="l00678"></a>00678         iEncoderState = EPngFlush;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   689
 
<a name="l00679"></a>00679         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   690
 
<a name="l00680"></a>00680
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   691
 
<a name="l00681"></a>00681 <span class="keywordtype">void</span> CPngWriteCodec::FlushCompressedDataL(TBufPtr8&amp; aDst, TFrameState&amp; <span class="comment">/*aState*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   692
 
<a name="l00682"></a>00682         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   693
 
<a name="l00683"></a>00683         <span class="keywordflow">if</span> (iCallAgain)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   694
 
<a name="l00684"></a>00684                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   695
 
<a name="l00685"></a>00685                 iCallAgain = iCompressor-&gt;DeflateL();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   696
 
<a name="l00686"></a>00686                 WriteIDATChunk(aDst);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   697
 
<a name="l00687"></a>00687                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   698
 
<a name="l00688"></a>00688         <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   699
 
<a name="l00689"></a>00689                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   700
 
<a name="l00690"></a>00690                 iEncoderState = EPngEndChunk;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   701
 
<a name="l00691"></a>00691                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   702
 
<a name="l00692"></a>00692         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   703
 
<a name="l00693"></a>00693
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   704
 
<a name="l00694"></a>00694 <span class="comment">// Write a PLTE chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   705
 
<a name="l00695"></a>00695 <span class="keywordtype">void</span> CPngWriteCodec::WritePLTEChunk(TBufPtr8&amp; aDst)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   706
 
<a name="l00696"></a>00696         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   707
 
<a name="l00697"></a>00697         ASSERT(iEncoder-&gt;Palette() &amp;&amp;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   708
 
<a name="l00698"></a>00698                    (iImageInfo.iColorType == TPngImageInformation::EIndexedColor ||
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   709
 
<a name="l00699"></a>00699                     iImageInfo.iColorType == TPngImageInformation::EDirectColor ||
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   710
 
<a name="l00700"></a>00700                     iImageInfo.iColorType == TPngImageInformation::EAlphaDirectColor)); <span class="comment">// allowed color types for PLTE chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   711
 
<a name="l00701"></a>00701
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   712
 
<a name="l00702"></a>00702         <span class="comment">// Get palette entries</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   713
 
<a name="l00703"></a>00703         CPalette* palette = iEncoder-&gt;Palette();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   714
 
<a name="l00704"></a>00704         ASSERT(palette);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   715
 
<a name="l00705"></a>00705         <span class="keyword">const</span> TInt count = palette-&gt;Entries();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   716
 
<a name="l00706"></a>00706         TUint8* ptr = iDestPtr + KPngChunkIdSize + KPngChunkLengthSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   717
 
<a name="l00707"></a>00707         TInt length = count * 3;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   718
 
<a name="l00708"></a>00708         TPtr8 data(ptr, length, length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   719
 
<a name="l00709"></a>00709         <span class="keywordflow">for</span> (TInt i=0; i &lt; count; i++)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   720
 
<a name="l00710"></a>00710                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   721
 
<a name="l00711"></a>00711                 TRgb rgb = palette-&gt;GetEntry(i);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   722
 
<a name="l00712"></a>00712                 *ptr = TUint8(rgb.Red());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   723
 
<a name="l00713"></a>00713                 ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   724
 
<a name="l00714"></a>00714                 *ptr = TUint8(rgb.Green());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   725
 
<a name="l00715"></a>00715                 ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   726
 
<a name="l00716"></a>00716                 *ptr = TUint8(rgb.Blue());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   727
 
<a name="l00717"></a>00717                 ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   728
 
<a name="l00718"></a>00718                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   729
 
<a name="l00719"></a>00719         <span class="comment">// Write PLTE chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   730
 
<a name="l00720"></a>00720         WritePngChunk(iDestPtr, KPngPLTEChunkId, data, length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   731
 
<a name="l00721"></a>00721         ASSERT(length % 3 == 0);        <span class="comment">// length must be divisible by 3</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   732
 
<a name="l00722"></a>00722         aDst.SetLength(length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   733
 
<a name="l00723"></a>00723         iEncoderState = EPngDeflate;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   734
 
<a name="l00724"></a>00724         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   735
 
<a name="l00725"></a>00725
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   736
 
<a name="l00726"></a>00726 <span class="comment">// Write a data chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   737
 
<a name="l00727"></a>00727 <span class="keywordtype">void</span> CPngWriteCodec::WriteIDATChunk(TBufPtr8&amp; aDst)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   738
 
<a name="l00728"></a>00728         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   739
 
<a name="l00729"></a>00729         TPtrC8 ptr(iCompressor-&gt;OutputDescriptor());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   740
 
<a name="l00730"></a>00730         <span class="keywordflow">if</span> (ptr.Length())
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   741
 
<a name="l00731"></a>00731                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   742
 
<a name="l00732"></a>00732                 TInt length = 0;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   743
 
<a name="l00733"></a>00733                 WritePngChunk(iDestPtr, KPngIDATChunkId, ptr, length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   744
 
<a name="l00734"></a>00734                 aDst.SetLength(length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   745
 
<a name="l00735"></a>00735
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   746
 
<a name="l00736"></a>00736                 <span class="comment">// New output can write to the same compressor ptr</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   747
 
<a name="l00737"></a>00737                 iCompressor-&gt;SetOutput(iCompressorPtr);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   748
 
<a name="l00738"></a>00738                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   749
 
<a name="l00739"></a>00739
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   750
 
<a name="l00740"></a>00740         <span class="keywordflow">if</span> (iCallAgain)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   751
 
<a name="l00741"></a>00741                 iEncoderState = EPngFlush;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   752
 
<a name="l00742"></a>00742         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   753
 
<a name="l00743"></a>00743
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   754
 
<a name="l00744"></a>00744 <span class="comment">// Write an END chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   755
 
<a name="l00745"></a>00745 <span class="keywordtype">void</span> CPngWriteCodec::WriteEndChunk(TBufPtr8&amp; aDst)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   756
 
<a name="l00746"></a>00746         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   757
 
<a name="l00747"></a>00747         <span class="comment">// Write IEND chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   758
 
<a name="l00748"></a>00748         TInt length = 0;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   759
 
<a name="l00749"></a>00749         WritePngChunk(iDestPtr, KPngIENDChunkId, KNullDesC8, length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   760
 
<a name="l00750"></a>00750         aDst.SetLength(length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   761
 
<a name="l00751"></a>00751         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   762
 
<a name="l00752"></a>00752
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   763
 
<a name="l00753"></a>00753 <span class="comment">// Write a header chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   764
 
<a name="l00754"></a>00754 TInt CPngWriteCodec::WriteHeaderChunk(TBufPtr8&amp; aDst)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   765
 
<a name="l00755"></a>00755         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   766
 
<a name="l00756"></a>00756         <span class="comment">// Write signature</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   767
 
<a name="l00757"></a>00757         Mem::Copy(iDestPtr, &amp;KPngSignature[0], KPngFileSignatureLength);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   768
 
<a name="l00758"></a>00758         iDestPtr += KPngFileSignatureLength;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   769
 
<a name="l00759"></a>00759
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   770
 
<a name="l00760"></a>00760         <span class="comment">// Write IHDR chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   771
 
<a name="l00761"></a>00761         TBuf8&lt;KPngIHDRChunkSize&gt; buffer;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   772
 
<a name="l00762"></a>00762         TUint8* ptr = <span class="keyword">const_cast&lt;</span>TUint8*<span class="keyword">&gt;</span>(buffer.Ptr());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   773
 
<a name="l00763"></a>00763         <span class="comment">// Set length of data</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   774
 
<a name="l00764"></a>00764         buffer.SetLength(KPngIHDRChunkSize);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   775
 
<a name="l00765"></a>00765         <span class="comment">// Chunk data</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   776
 
<a name="l00766"></a>00766         <span class="comment">// width (4 bytes)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   777
 
<a name="l00767"></a>00767         <span class="keywordflow">if</span> ((iImageInfo.iSize.iWidth == 0) ||
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   778
 
<a name="l00768"></a>00768                 (static_cast&lt;TUint&gt;(iImageInfo.iSize.iWidth) &gt; KPngMaxImageSize))
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   779
 
<a name="l00769"></a>00769                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   780
 
<a name="l00770"></a>00770                 <span class="keywordflow">return</span> KErrArgument;    <span class="comment">// invalid width</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   781
 
<a name="l00771"></a>00771                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   782
 
<a name="l00772"></a>00772         PtrWriteUtil::WriteBigEndianInt32(ptr, iImageInfo.iSize.iWidth);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   783
 
<a name="l00773"></a>00773         ptr += 4;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   784
 
<a name="l00774"></a>00774         <span class="comment">// height (4 bytes)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   785
 
<a name="l00775"></a>00775         <span class="keywordflow">if</span> ((iImageInfo.iSize.iHeight == 0) ||
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   786
 
<a name="l00776"></a>00776                 (static_cast&lt;TUint&gt;(iImageInfo.iSize.iHeight) &gt; KPngMaxImageSize))
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   787
 
<a name="l00777"></a>00777                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   788
 
<a name="l00778"></a>00778                 <span class="keywordflow">return</span> KErrArgument;    <span class="comment">// invalid height</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   789
 
<a name="l00779"></a>00779                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   790
 
<a name="l00780"></a>00780         PtrWriteUtil::WriteBigEndianInt32(ptr, iImageInfo.iSize.iHeight);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   791
 
<a name="l00781"></a>00781         ptr += 4;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   792
 
<a name="l00782"></a>00782         <span class="comment">// bit depth (1 byte)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   793
 
<a name="l00783"></a>00783         PtrWriteUtil::WriteInt8(ptr, iImageInfo.iBitDepth);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   794
 
<a name="l00784"></a>00784         ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   795
 
<a name="l00785"></a>00785         <span class="comment">// colour type (1 byte)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   796
 
<a name="l00786"></a>00786         PtrWriteUtil::WriteInt8(ptr, iImageInfo.iColorType);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   797
 
<a name="l00787"></a>00787         ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   798
 
<a name="l00788"></a>00788         <span class="comment">// compression method (1 byte)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   799
 
<a name="l00789"></a>00789         PtrWriteUtil::WriteInt8(ptr, iImageInfo.iCompressionMethod);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   800
 
<a name="l00790"></a>00790         ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   801
 
<a name="l00791"></a>00791         <span class="comment">// filter method (1 byte)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   802
 
<a name="l00792"></a>00792         PtrWriteUtil::WriteInt8(ptr, iImageInfo.iFilterMethod);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   803
 
<a name="l00793"></a>00793         ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   804
 
<a name="l00794"></a>00794         <span class="comment">// interlace method (1 byte)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   805
 
<a name="l00795"></a>00795         PtrWriteUtil::WriteInt8(ptr, iImageInfo.iInterlaceMethod);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   806
 
<a name="l00796"></a>00796         ptr++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   807
 
<a name="l00797"></a>00797
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   808
 
<a name="l00798"></a>00798         TInt length = 0;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   809
 
<a name="l00799"></a>00799         WritePngChunk(iDestPtr, KPngIHDRChunkId, buffer, length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   810
 
<a name="l00800"></a>00800         aDst.SetLength(KPngFileSignatureLength + length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   811
 
<a name="l00801"></a>00801
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   812
 
<a name="l00802"></a>00802         <span class="keywordflow">return</span> KErrNone;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   813
 
<a name="l00803"></a>00803         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   814
 
<a name="l00804"></a>00804
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   815
 
<a name="l00805"></a>00805 <span class="comment">// Chunk writing helper function</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   816
 
<a name="l00806"></a>00806 <span class="keywordtype">void</span> CPngWriteCodec::WritePngChunk(TUint8*&amp; aDestPtr, <span class="keyword">const</span> TDesC8&amp; aChunkId, <span class="keyword">const</span> TDesC8&amp; aData, TInt&amp; aLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   817
 
<a name="l00807"></a>00807         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   818
 
<a name="l00808"></a>00808         <span class="comment">// Chunk length (4 bytes)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   819
 
<a name="l00809"></a>00809         PtrWriteUtil::WriteBigEndianInt32(aDestPtr, aData.Length());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   820
 
<a name="l00810"></a>00810         aDestPtr += KPngChunkLengthSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   821
 
<a name="l00811"></a>00811         TUint8* crcPtr = aDestPtr;      <span class="comment">// start position for calculating CRC</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   822
 
<a name="l00812"></a>00812         <span class="comment">// Chunk type (4 bytes)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   823
 
<a name="l00813"></a>00813         Mem::Copy(aDestPtr, aChunkId.Ptr(), KPngChunkIdSize);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   824
 
<a name="l00814"></a>00814         aDestPtr += KPngChunkIdSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   825
 
<a name="l00815"></a>00815         <span class="comment">// Chunk data (0...n bytes)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   826
 
<a name="l00816"></a>00816         Mem::Copy(aDestPtr, aData.Ptr(), aData.Length());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   827
 
<a name="l00817"></a>00817         aDestPtr += aData.Length();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   828
 
<a name="l00818"></a>00818         <span class="comment">// CRC (4 bytes)</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   829
 
<a name="l00819"></a>00819         TUint32 crc = KPngCrcMask;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   830
 
<a name="l00820"></a>00820         GetCrc(crc, crcPtr, KPngChunkIdSize + aData.Length());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   831
 
<a name="l00821"></a>00821         crc ^= KPngCrcMask;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   832
 
<a name="l00822"></a>00822         PtrWriteUtil::WriteBigEndianInt32(aDestPtr, crc);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   833
 
<a name="l00823"></a>00823         aDestPtr += KPngChunkCRCSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   834
 
<a name="l00824"></a>00824         <span class="comment">// Length of chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   835
 
<a name="l00825"></a>00825         aLength = KPngChunkLengthSize + KPngChunkIdSize + aData.Length() + KPngChunkCRCSize;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   836
 
<a name="l00826"></a>00826         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   837
 
<a name="l00827"></a>00827
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   838
 
<a name="l00828"></a>00828 <span class="comment">// from MEZBufferManager, manage data compressor</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   839
 
<a name="l00829"></a>00829 <span class="keywordtype">void</span> CPngWriteCodec::InitializeL(CEZZStream&amp; <span class="comment">/*aZStream*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   840
 
<a name="l00830"></a>00830         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   841
 
<a name="l00831"></a>00831         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   842
 
<a name="l00832"></a>00832
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   843
 
<a name="l00833"></a>00833 <span class="keywordtype">void</span> CPngWriteCodec::NeedInputL(CEZZStream&amp; aZStream)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   844
 
<a name="l00834"></a>00834         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   845
 
<a name="l00835"></a>00835         <span class="comment">// Give compressor more data from encoder</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   846
 
<a name="l00836"></a>00836         aZStream.SetInput(iEncoder-&gt;EncodeL(iScanline));
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   847
 
<a name="l00837"></a>00837         <span class="keywordflow">if</span> (iCompressor-&gt;AvailIn() != 0)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   848
 
<a name="l00838"></a>00838                 iScanline++;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   849
 
<a name="l00839"></a>00839         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   850
 
<a name="l00840"></a>00840
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   851
 
<a name="l00841"></a>00841 <span class="keywordtype">void</span> CPngWriteCodec::NeedOutputL(CEZZStream&amp; <span class="comment">/*aZStream*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   852
 
<a name="l00842"></a>00842         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   853
 
<a name="l00843"></a>00843         <span class="comment">// Signal to write an IDAT chunk</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   854
 
<a name="l00844"></a>00844         iEncoderState = EPngWriteIDAT;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   855
 
<a name="l00845"></a>00845         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   856
 
<a name="l00846"></a>00846
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   857
 
<a name="l00847"></a>00847 <span class="keywordtype">void</span> CPngWriteCodec::FinalizeL(CEZZStream&amp; <span class="comment">/*aZStream*/</span>)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   858
 
<a name="l00848"></a>00848         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   859
 
<a name="l00849"></a>00849         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   860
 
<a name="l00850"></a>00850
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   861
 
<a name="l00851"></a>00851 <span class="comment">// Calculate CRC for PNG chunks</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   862
 
<a name="l00852"></a>00852 <span class="keywordtype">void</span> CPngWriteCodec::GetCrc(TUint32&amp; aCrc, <span class="keyword">const</span> TUint8* aPtr, <span class="keyword">const</span> TInt aLength)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   863
 
<a name="l00853"></a>00853         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   864
 
<a name="l00854"></a>00854         <span class="keywordflow">if</span> (!iCrcTableCalculated)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   865
 
<a name="l00855"></a>00855                 CalcCrcTable();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   866
 
<a name="l00856"></a>00856         TUint32 code = aCrc;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   867
 
<a name="l00857"></a>00857         <span class="keywordflow">for</span> (TInt i=0; i &lt; aLength; i++)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   868
 
<a name="l00858"></a>00858                 code = iCrcTable[(code ^ aPtr[i]) &amp; 0xff] ^ (code &gt;&gt; 8);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   869
 
<a name="l00859"></a>00859         aCrc = code;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   870
 
<a name="l00860"></a>00860         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   871
 
<a name="l00861"></a>00861
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   872
 
<a name="l00862"></a>00862 <span class="keywordtype">void</span> CPngWriteCodec::CalcCrcTable()
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   873
 
<a name="l00863"></a>00863         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   874
 
<a name="l00864"></a>00864         <span class="keywordflow">for</span> (TInt i=0; i &lt; KPngCrcTableLength; i++)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   875
 
<a name="l00865"></a>00865                 {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   876
 
<a name="l00866"></a>00866                 TUint32 code = <span class="keyword">static_cast&lt;</span>TUint32<span class="keyword">&gt;</span>(i);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   877
 
<a name="l00867"></a>00867
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   878
 
<a name="l00868"></a>00868                 <span class="keywordflow">for</span> (TInt j = 0; j &lt; 8; j++)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   879
 
<a name="l00869"></a>00869                         {
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   880
 
<a name="l00870"></a>00870                         <span class="keywordflow">if</span> (code &amp; 1)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   881
 
<a name="l00871"></a>00871                                 code = 0xedb88320 ^ (code &gt;&gt; 1);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   882
 
<a name="l00872"></a>00872                         <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   883
 
<a name="l00873"></a>00873                                 code = code &gt;&gt; 1;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   884
 
<a name="l00874"></a>00874                         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   885
 
<a name="l00875"></a>00875                 iCrcTable[i] = code;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   886
 
<a name="l00876"></a>00876                 }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   887
 
<a name="l00877"></a>00877         iCrcTableCalculated = ETrue;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   888
 
<a name="l00878"></a>00878         }
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   889
 
</pre></div></div>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   890
 
<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   891
 
<a href="http://www.doxygen.org/index.html">
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   892
 
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   893
 
</body>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   894
 
</html>
MCL/sftools/depl/docscontent