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<h1>video_asm.h</h1><a href="video__asm_8h.html">Go to the documentation of this file.</a><pre class="fragment"><div>00001 <span class="preprocessor">#ifndef VIDEO_ASM_H</span>
00002 <span class="preprocessor"></span><span class="preprocessor">#define VIDEO_ASM_H</span>
00003 <span class="preprocessor"></span>
00004 <span class="comment">/* interface to C */</span>
00005
00006 <span class="preprocessor">#ifdef __cplusplus</span>
00007 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
00008 <span class="preprocessor">#endif</span>
00009 <span class="preprocessor"></span>
00010 <span class="comment">/* Fast assambly routines for common operations on video: adding</span>
00011 <span class="comment"> buffers, substracting, taking diffs, etc.</span>
00012 <span class="comment"> All operations are performed bytewise, the void * are just used</span>
00013 <span class="comment"> to keep the compiler happy.</span>
00014 <span class="comment"> </span>
00015 <span class="comment"> The functions ending in '_mmx' use MMX instructions, acting on 4 or even</span>
00016 <span class="comment"> 8 bytes at a time. It follows that 'n' should be a multiple of 8. The</span>
00017 <span class="comment"> '_smx' function use the Saturated version of the MMX instructions.</span>
00018 <span class="comment"> </span>
00019 <span class="comment"> Definitions:</span>
00020 <span class="comment"> 'diff': c = (a - b) / 2</span>
00021 <span class="comment"> 'intg': c += (a * 2);</span>
00022 <span class="comment"> </span>
00023 <span class="comment"> 'add': a += b</span>
00024 <span class="comment"> 'plus': c = a + b</span>
00025 <span class="comment"> 'sub': a -= b</span>
00026 <span class="comment"> 'minus': c = a - b</span>
00027 <span class="comment"></span>
00028 <span class="comment"> The '128' version of the functions assume the data in the buffers has a</span>
00029 <span class="comment"> virtual null point at 128, and compensate for this.</span>
00030 <span class="comment"> */</span>
00031
00032 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a0">calc_diff128</a> (<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src_new, <span class="keywordtype">void</span> *src_old);
00033
00034 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a1">calc_intg128</a> (<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *delta);
00035
00036 <span class="comment">/* Basic operators */</span>
00037 <span class="comment">/* Add 'src' to 'dst' */</span>
00038 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a2">calc_add</a> (<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src);
00039 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a3">calc_add_mmx</a>(<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src);
00040 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a4">calc_add_smx</a>(<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src);
00041
00042 <span class="comment">/* Add 'src' to 'dst', with offset 128 */</span>
00043 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a5">calc_add128_mmx</a>(<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src);
00044
00045 <span class="comment">/* Add 'src1' to 'src2', storing the result in 'dst' */</span>
00046 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a6">calc_plus</a> (<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src1, <span class="keywordtype">void</span> *src2);
00047 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a7">calc_plus_mmx</a>(<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src1, <span class="keywordtype">void</span> *src2);
00048 <span class="keywordtype">void</span> <a class="code" href="video__asm_8h.html#a8">calc_plus_smx</a>(<span class="keywordtype">int</span> n, <span class="keywordtype">void</span> *dst, <span class="keywordtype">void</span> *src1, <span class="keywordtype">void</span> *src2);
00049
00050 <span class="preprocessor">#ifdef __cplusplus</span>
00051 <span class="preprocessor"></span>}
00052 <span class="preprocessor">#endif</span>
00053 <span class="preprocessor"></span>
00054 <span class="preprocessor">#endif</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Wed Dec 13 23:38:46 2006 for CamStream by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 ></a> 1.3.7 </small></address>
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