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<h1>contrast.cpp</h1><a href="contrast_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> pbrt source code Copyright(c) 1998-2007 Matt Pharr and Greg Humphreys.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> This file is part of pbrt.</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment"> pbrt is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment"> it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment"> the Free Software Foundation; either version 2 of the License, or</span>
<a name="l00010"></a>00010 <span class="comment"> (at your option) any later version. Note that the text contents of</span>
<a name="l00011"></a>00011 <span class="comment"> the book "Physically Based Rendering" are *not* licensed under the</span>
<a name="l00012"></a>00012 <span class="comment"> GNU GPL.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment"> pbrt is distributed in the hope that it will be useful,</span>
<a name="l00015"></a>00015 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00016"></a>00016 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00017"></a>00017 <span class="comment"> GNU General Public License for more details.</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment"> You should have received a copy of the GNU General Public License</span>
<a name="l00020"></a>00020 <span class="comment"> along with this program. If not, see <http://www.gnu.org/licenses/>.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> */</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// contrast.cpp*</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="tonemap_8h.html">tonemap.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="paramset_8h.html">paramset.h</a>"</span>
<a name="l00027"></a>00027 <span class="comment">// ContrastOp Declarations</span>
<a name="l00028"></a><a class="code" href="classContrastOp.html">00028</a> <span class="keyword">class </span><a class="code" href="classContrastOp.html">ContrastOp</a> : <span class="keyword">public</span> <a class="code" href="classToneMap.html">ToneMap</a> {
<a name="l00029"></a>00029 <span class="keyword">public</span>:
<a name="l00030"></a><a class="code" href="classContrastOp.html#2060dafc4b9fa69031ea93f6a01e73bd">00030</a> <a class="code" href="classContrastOp.html#2060dafc4b9fa69031ea93f6a01e73bd">ContrastOp</a>(<span class="keywordtype">float</span> day) { <a class="code" href="classContrastOp.html#3d470f0a86f0fa65811191ba2ba5a0c0">displayAdaptationY</a> = day; }
<a name="l00031"></a>00031 <span class="keywordtype">void</span> <a class="code" href="classContrastOp.html#36025f3e9409bdb004d2f79a197b69d9">Map</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *y,
<a name="l00032"></a>00032 <span class="keywordtype">int</span> xRes, <span class="keywordtype">int</span> yRes,
<a name="l00033"></a>00033 <span class="keywordtype">float</span> maxDisplayY, <span class="keywordtype">float</span> *scale) <span class="keyword">const</span>;
<a name="l00034"></a><a class="code" href="classContrastOp.html#3d470f0a86f0fa65811191ba2ba5a0c0">00034</a> <span class="keywordtype">float</span> <a class="code" href="classContrastOp.html#3d470f0a86f0fa65811191ba2ba5a0c0">displayAdaptationY</a>;
<a name="l00035"></a>00035 };
<a name="l00036"></a>00036 <span class="comment">// ContrastOp Method Definitions</span>
<a name="l00037"></a><a class="code" href="classContrastOp.html#36025f3e9409bdb004d2f79a197b69d9">00037</a> <span class="keywordtype">void</span> <a class="code" href="classContrastOp.html#36025f3e9409bdb004d2f79a197b69d9">ContrastOp::Map</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *y, <span class="keywordtype">int</span> xRes, <span class="keywordtype">int</span> yRes,
<a name="l00038"></a>00038 <span class="keywordtype">float</span> maxDisplayY, <span class="keywordtype">float</span> *scale)<span class="keyword"> const </span>{
<a name="l00039"></a>00039 <span class="comment">// Compute world adaptation luminance, _Ywa_</span>
<a name="l00040"></a>00040 <span class="keywordtype">float</span> Ywa = 0.;
<a name="l00041"></a>00041 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < xRes * yRes; ++i)
<a name="l00042"></a>00042 <span class="keywordflow">if</span> (y[i] > 0) Ywa += logf(y[i]);
<a name="l00043"></a>00043 Ywa = expf(Ywa / (xRes * yRes));
<a name="l00044"></a>00044 <span class="comment">// Compute contrast-preserving scalefactor, _s_</span>
<a name="l00045"></a>00045 <span class="keywordtype">float</span> s = powf((1.219f + powf(<a class="code" href="classContrastOp.html#3d470f0a86f0fa65811191ba2ba5a0c0">displayAdaptationY</a>, 0.4f)) /
<a name="l00046"></a>00046 (1.219f + powf(Ywa, 0.4f)), 2.5f);
<a name="l00047"></a>00047 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < xRes*yRes; ++i)
<a name="l00048"></a>00048 scale[i] = s;
<a name="l00049"></a>00049 }
<a name="l00050"></a><a class="code" href="contrast_8cpp.html#0662a1b08fa411db8dd44c1770cb8543">00050</a> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> <a class="code" href="pbrt_8h.html#808e08638be3cba36e36759e5b150de0">DLLEXPORT</a> <a class="code" href="classToneMap.html">ToneMap</a> *<a class="code" href="contrast_8cpp.html#0662a1b08fa411db8dd44c1770cb8543">CreateToneMap</a>(<span class="keyword">const</span> <a class="code" href="classParamSet.html">ParamSet</a> &ps) {
<a name="l00051"></a>00051 <span class="keywordtype">float</span> day = ps.<a class="code" href="classParamSet.html#87143fd8e73a75082179a110d42531a4">FindOneFloat</a>(<span class="stringliteral">"displayadaptationY"</span>, 50.f);
<a name="l00052"></a>00052 <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classContrastOp.html#2060dafc4b9fa69031ea93f6a01e73bd">ContrastOp</a>(day);
<a name="l00053"></a>00053 }
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