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ImageStone - A Powerful C++ Class Library for Image Manipulation

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6 Dec 2011Zlib3 min read 1.1M   51.5K   405  
An article on a library for image manipulation
 
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<h1>Rle.h</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/*</span>
00002 <span class="comment"> *   Copyright (C) =USTC= Fu Li</span>
00003 <span class="comment"> *</span>
00004 <span class="comment"> *   Author   :  Fu Li</span>
00005 <span class="comment"> *   Create   :  2000-9-6</span>
00006 <span class="comment"> *   Home     :  http://www.crazy-bit.com/</span>
00007 <span class="comment"> *   Mail     :  crazybit@263.net</span>
00008 <span class="comment"> *   History  :  </span>
00009 <span class="comment"> */</span>
00010 <span class="preprocessor">#ifndef __PCL_COMPRESS__2000_09_06__H__</span>
00011 <span class="preprocessor"></span><span class="preprocessor">#define __PCL_COMPRESS__2000_09_06__H__</span>
00012 <span class="preprocessor"></span><span class="preprocessor">#include "../FColor.h"</span>
00013 
00014 <span class="comment">//=============================================================================</span>
<a name="l00018"></a><a class="code" href="class_f_c_compress.html">00018</a> <span class="comment"></span><span class="keyword">class </span><a class="code" href="class_f_c_compress.html">FCCompress</a>
00019 {
00020 <span class="keyword">public</span>:
00025     <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="class_f_c_compress.html#e0">RLE_PCX_Encode</a> (<span class="keyword">const</span> BYTE* pInBuffer, <span class="keywordtype">int</span> nInSize, BYTE* pOutBuffer) ;
00030     <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="class_f_c_compress.html#e1">RLE_PCX_Decode</a> (<span class="keyword">const</span> BYTE* pInBuffer, <span class="keywordtype">int</span> nInSize, BYTE* pOutBuffer) ;
00031 
00038     <span class="keyword">static</span> BYTE* <a class="code" href="class_f_c_compress.html#e2">RLE_TGA_EncodeLine</a> (<span class="keyword">const</span> BYTE* pInBuffer, <span class="keywordtype">int</span> iColorBit, <span class="keywordtype">int</span> iNumPixel, BYTE* pOutBuffer) ;
00045     <span class="keyword">static</span> BYTE* <a class="code" href="class_f_c_compress.html#e3">RLE_TGA_DecodeLine</a> (<span class="keyword">const</span> BYTE* pInBuffer, <span class="keywordtype">int</span> iColorBit, <span class="keywordtype">int</span> iNumPixel, BYTE* pOutBuffer) ;
00046 };
00047 
00048 <span class="comment">//=============================================================================</span>
00049 <span class="comment">// inline Implement</span>
00050 <span class="comment">//=============================================================================</span>
<a name="l00051"></a><a class="code" href="class_f_c_compress.html#e0">00051</a> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="class_f_c_compress.html#e0">FCCompress::RLE_PCX_Encode</a> (<span class="keyword">const</span> BYTE* pInBuffer, <span class="keywordtype">int</span> nInSize, BYTE* pOutBuffer)
00052 {
00053     <span class="keyword">const</span> BYTE   * pOutStart = pOutBuffer ;
00054     <span class="keywordflow">while</span> (nInSize-- &gt; 0)
00055     {
00056         <span class="keyword">const</span> BYTE   byData = *pInBuffer++ ;
00057         BYTE         cCount = 1 ;
00058         <span class="keywordflow">while</span> ( (cCount &lt; 0x3F) &amp;&amp; (nInSize != 0) )
00059             <span class="keywordflow">if</span> (*pInBuffer != byData) <span class="comment">// Stat. the repeat BYTE</span>
00060                 break ;
00061             <span class="keywordflow">else</span>
00062             {
00063                 cCount++ ; pInBuffer++ ; nInSize-- ;
00064             }
00065 
00066         <span class="keywordflow">if</span> (cCount == 1) <span class="comment">// unique</span>
00067         {
00068             <span class="keywordflow">if</span> ( byData &gt;= 0xC0 ) <span class="comment">// Data &gt;= 0xC0</span>
00069             {
00070                 *pOutBuffer++ = 0xC1 ;
00071                 *pOutBuffer++ = byData ;
00072             }
00073             <span class="keywordflow">else</span>
00074                 *pOutBuffer++ = byData ; <span class="comment">// Data &lt; 0xC0, write directly</span>
00075         }
00076         <span class="keywordflow">else</span> <span class="comment">// repeat</span>
00077         {
00078             *pOutBuffer++ = 0xC0 | cCount ;
00079             *pOutBuffer++ = byData ;
00080         }
00081     }
00082     <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)(pOutBuffer - pOutStart) ;
00083 }
00084 <span class="comment">//-----------------------------------------------------------------------------</span>
<a name="l00085"></a><a class="code" href="class_f_c_compress.html#e1">00085</a> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="class_f_c_compress.html#e1">FCCompress::RLE_PCX_Decode</a> (<span class="keyword">const</span> BYTE* pInBuffer, <span class="keywordtype">int</span> nInSize, BYTE* pOutBuffer)
00086 {
00087     <span class="keyword">const</span> BYTE   * pOutStart = pOutBuffer ;
00088     <span class="keywordflow">while</span> (nInSize-- &gt; 0)
00089     {
00090         <span class="keyword">const</span> BYTE   byData = *pInBuffer++ ; <span class="comment">// read byte and move ptr to next</span>
00091         <span class="keywordflow">if</span> ( byData &gt;= 0xC0 )
00092         {
00093             <span class="comment">// error : the inbuffer has been exhausted.</span>
00094             <span class="keywordflow">if</span> (nInSize &lt;= 0)
00095             {
00096                 assert(<span class="keyword">false</span>) ; <span class="keywordflow">goto</span> rleOver;
00097             }
00098 
00099             BYTE     cNum = byData &amp; 0x3F ; <span class="comment">// repeat current byte Num</span>
00100             ::memset (pOutBuffer, *pInBuffer++, cNum) ; <span class="comment">// memset func will check "Num" =? 0</span>
00101             pOutBuffer += cNum ;
00102             nInSize-- ;
00103         }
00104         <span class="keywordflow">else</span>
00105             *pOutBuffer++ = byData ;
00106     }
00107 rleOver:
00108     <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)(pOutBuffer - pOutStart) ;
00109 }
00110 <span class="comment">//-----------------------------------------------------------------------------</span>
<a name="l00111"></a><a class="code" href="class_f_c_compress.html#e2">00111</a> <span class="keyword">inline</span> BYTE* <a class="code" href="class_f_c_compress.html#e2">FCCompress::RLE_TGA_EncodeLine</a> (<span class="keyword">const</span> BYTE* InBuffer, <span class="keywordtype">int</span> iColorBit, <span class="keywordtype">int</span> iNumPixel, BYTE* OutBuffer)
00112 {
00113     iColorBit /= 8 ; <span class="comment">// convert to bytes : 1,2,3,4</span>
00114     <span class="keywordflow">while</span> (iNumPixel &gt; 0)
00115     {
00116         DWORD      Data = 0, Next = 0, Count = 1 ;
00117         <a class="code" href="class_f_c_color.html#e3">FCColor::CopyPixel</a> (&amp;Data, InBuffer, iColorBit) ; <span class="comment">// first pixel</span>
00118         InBuffer += iColorBit ; iNumPixel-- ;
00119         <span class="keywordflow">while</span> ((Count &lt; 0x80) &amp;&amp; (iNumPixel &gt; 0)) <span class="comment">// Stat. the repeat pixel</span>
00120         {
00121             <a class="code" href="class_f_c_color.html#e3">FCColor::CopyPixel</a> (&amp;Next, InBuffer, iColorBit) ; <span class="comment">// next pixel</span>
00122             <span class="keywordflow">if</span> (Next != Data)
00123                 break ;
00124             InBuffer += iColorBit ; iNumPixel-- ; Count++ ;
00125         }
00126 
00127         *OutBuffer++ = 0x80 | (BYTE)--Count ;
00128         <a class="code" href="class_f_c_color.html#e3">FCColor::CopyPixel</a> (OutBuffer, &amp;Data, iColorBit) ;
00129         OutBuffer += iColorBit ;
00130     }
00131     <span class="keywordflow">return</span> OutBuffer ;
00132 }
00133 <span class="comment">//-----------------------------------------------------------------------------</span>
<a name="l00134"></a><a class="code" href="class_f_c_compress.html#e3">00134</a> <span class="keyword">inline</span> BYTE* <a class="code" href="class_f_c_compress.html#e3">FCCompress::RLE_TGA_DecodeLine</a> (<span class="keyword">const</span> BYTE* InBuffer, <span class="keywordtype">int</span> iColorBit, <span class="keywordtype">int</span> iNumPixel, BYTE* OutBuffer)
00135 {
00136     iColorBit /= 8 ; <span class="comment">// convert to bytes : 1,2,3,4</span>
00137     <span class="keywordflow">while</span> (iNumPixel &gt; 0)
00138     {
00139         <span class="keyword">const</span> BYTE    byData = *InBuffer++ ; <span class="comment">// Next Byte</span>
00140         <span class="keywordflow">if</span> (byData &amp; 0x80) <span class="comment">// Data &gt;= 0x80</span>
00141         {
00142             <span class="keyword">const</span> <span class="keywordtype">int</span>    nNum = (byData &amp; 0x7F) + 1 ; <span class="comment">// number of repeat pixel</span>
00143             iNumPixel -= nNum ;
00144             <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0 ; i &lt; nNum ; i++, OutBuffer += iColorBit)
00145                 <a class="code" href="class_f_c_color.html#e3">FCColor::CopyPixel</a> (OutBuffer, InBuffer, iColorBit) ;
00146             InBuffer += iColorBit ;
00147         }
00148         <span class="keywordflow">else</span>
00149         {
00150             <span class="comment">// copy directly</span>
00151             <span class="keyword">const</span> <span class="keywordtype">int</span>   n = byData + 1, <span class="comment">// non-repeat pixel</span>
00152                         nByte = n * iColorBit ; <span class="comment">// calculate copy bytes</span>
00153             iNumPixel -= n ;
00154             ::memcpy (OutBuffer, InBuffer, nByte) ;
00155             OutBuffer += nByte ;
00156             InBuffer += nByte ;
00157         }
00158     }
00159     assert (iNumPixel == 0) ;
00160     <span class="keywordflow">return</span> const_cast&lt;BYTE*&gt;(InBuffer) ;
00161 }
00162 
00163 <span class="preprocessor">#endif</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Wed Mar 8 11:12:47 2006 for ImageStone by&nbsp;
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Written By
crazybit
Team Leader PhoXo
China China
graduate from University of Science and Technology of China at 2002.

Now I work at www.phoxo.com.

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Posted 24 Mar 2006

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