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<h1>exr.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// -*- C++;indent-tabs-mode: t; tab-width: 4; c-basic-offset: 4; -*-</span>
<a name="l00002"></a>00002
<a name="l00013"></a>00013 <span class="preprocessor">#include "config.h"</span>
<a name="l00014"></a>00014
<a name="l00015"></a>00015 <span class="preprocessor">#ifdef HAVE_EXR</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <ImfRgbaFile.h></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include <ImfStandardAttributes.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <ImathBox.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <ImfInputFile.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <ImfBoxAttribute.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <ImfChannelListAttribute.h></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <ImfCompressionAttribute.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <ImfFloatAttribute.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <ImfIntAttribute.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <ImfLineOrderAttribute.h></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <ImfStringAttribute.h></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <ImfVecAttribute.h></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <ImfArray.h></span>
<a name="l00030"></a>00030 <span class="preprocessor">#include <ImfConvert.h></span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="preprocessor">#include <iostream></span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="preprocessor">#include <kurl.h></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <kprocess.h></span>
<a name="l00038"></a>00038 <span class="preprocessor">#include <klocale.h></span>
<a name="l00039"></a>00039 <span class="preprocessor">#include <kgenericfactory.h></span>
<a name="l00040"></a>00040 <span class="preprocessor">#include <kdebug.h></span>
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="preprocessor">#include <qimage.h></span>
<a name="l00043"></a>00043 <span class="preprocessor">#include <qcstring.h></span>
<a name="l00044"></a>00044 <span class="preprocessor">#include <qfile.h></span>
<a name="l00045"></a>00045 <span class="preprocessor">#include <qdatetime.h></span>
<a name="l00046"></a>00046 <span class="preprocessor">#include <qdict.h></span>
<a name="l00047"></a>00047 <span class="preprocessor">#include <qvalidator.h></span>
<a name="l00048"></a>00048 <span class="preprocessor">#include <qcolor.h></span>
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="preprocessor">#include "exr.h"</span>
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keyword">using</span> <span class="keyword">namespace </span>Imf;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="comment">/* this does a conversion from the ILM Half (equal to Nvidia Half)</span>
<a name="l00055"></a>00055 <span class="comment"> * format into the normal 32 bit pixel format. Process is from the</span>
<a name="l00056"></a>00056 <span class="comment"> * ILM code.</span>
<a name="l00057"></a>00057 <span class="comment"> */</span>
<a name="l00058"></a>00058 QRgb RgbaToQrgba(<span class="keyword">struct</span> Rgba imagePixel)
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 <span class="keywordtype">float</span> r,g,b,a;
<a name="l00061"></a>00061
<a name="l00062"></a>00062 <span class="comment">// 1) Compensate for fogging by subtracting defog</span>
<a name="l00063"></a>00063 <span class="comment">// from the raw pixel values.</span>
<a name="l00064"></a>00064 <span class="comment">// Response: We work with defog of 0.0, so this is a no-op </span>
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">// 2) Multiply the defogged pixel values by</span>
<a name="l00067"></a>00067 <span class="comment">// 2^(exposure + 2.47393).</span>
<a name="l00068"></a>00068 <span class="comment">// Response: We work with exposure of 0.0.</span>
<a name="l00069"></a>00069 <span class="comment">// (2^2.47393) is 5.55555 </span>
<a name="l00070"></a>00070 r = imagePixel.r * 5.55555;
<a name="l00071"></a>00071 g = imagePixel.g * 5.55555;
<a name="l00072"></a>00072 b = imagePixel.b * 5.55555;
<a name="l00073"></a>00073 a = imagePixel.a * 5.55555;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">// 3) Values, which are now 1.0, are called "middle gray".</span>
<a name="l00076"></a>00076 <span class="comment">// If defog and exposure are both set to 0.0, then</span>
<a name="l00077"></a>00077 <span class="comment">// middle gray corresponds to a raw pixel value of 0.18.</span>
<a name="l00078"></a>00078 <span class="comment">// In step 6, middle gray values will be mapped to an</span>
<a name="l00079"></a>00079 <span class="comment">// intensity 3.5 f-stops below the display's maximum</span>
<a name="l00080"></a>00080 <span class="comment">// intensity.</span>
<a name="l00081"></a>00081 <span class="comment">// Response: no apparent content.</span>
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="comment">// 4) Apply a knee function. The knee function has two</span>
<a name="l00084"></a>00084 <span class="comment">// parameters, kneeLow and kneeHigh. Pixel values</span>
<a name="l00085"></a>00085 <span class="comment">// below 2^kneeLow are not changed by the knee</span>
<a name="l00086"></a>00086 <span class="comment">// function. Pixel values above kneeLow are lowered</span>
<a name="l00087"></a>00087 <span class="comment">// according to a logarithmic curve, such that the</span>
<a name="l00088"></a>00088 <span class="comment">// value 2^kneeHigh is mapped to 2^3.5 (in step 6,</span>
<a name="l00089"></a>00089 <span class="comment">// this value will be mapped to the the display's</span>
<a name="l00090"></a>00090 <span class="comment">// maximum intensity).</span>
<a name="l00091"></a>00091 <span class="comment">// Response: kneeLow = 0.0 (2^0.0 => 1); kneeHigh = 5.0 (2^5 =>32)</span>
<a name="l00092"></a>00092 <span class="keywordflow">if</span> (r > 1.0)
<a name="l00093"></a>00093 r = 1.0 + Imath::Math<float>::log ((r-1.0) * 0.184874 + 1) / 0.184874;
<a name="l00094"></a>00094 <span class="keywordflow">if</span> (g > 1.0)
<a name="l00095"></a>00095 g = 1.0 + Imath::Math<float>::log ((g-1.0) * 0.184874 + 1) / 0.184874;
<a name="l00096"></a>00096 <span class="keywordflow">if</span> (b > 1.0)
<a name="l00097"></a>00097 b = 1.0 + Imath::Math<float>::log ((b-1.0) * 0.184874 + 1) / 0.184874;
<a name="l00098"></a>00098 <span class="keywordflow">if</span> (a > 1.0)
<a name="l00099"></a>00099 a = 1.0 + Imath::Math<float>::log ((a-1.0) * 0.184874 + 1) / 0.184874;
<a name="l00100"></a>00100 <span class="comment">//</span>
<a name="l00101"></a>00101 <span class="comment">// 5) Gamma-correct the pixel values, assuming that the</span>
<a name="l00102"></a>00102 <span class="comment">// screen's gamma is 0.4545 (or 1/2.2).</span>
<a name="l00103"></a>00103 r = Imath::Math<float>::pow (r, 0.4545);
<a name="l00104"></a>00104 g = Imath::Math<float>::pow (g, 0.4545);
<a name="l00105"></a>00105 b = Imath::Math<float>::pow (b, 0.4545);
<a name="l00106"></a>00106 a = Imath::Math<float>::pow (a, 0.4545);
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="comment">// 6) Scale the values such that pixels middle gray</span>
<a name="l00109"></a>00109 <span class="comment">// pixels are mapped to 84.66 (or 3.5 f-stops below</span>
<a name="l00110"></a>00110 <span class="comment">// the display's maximum intensity).</span>
<a name="l00111"></a>00111 <span class="comment">//</span>
<a name="l00112"></a>00112 <span class="comment">// 7) Clamp the values to [0, 255].</span>
<a name="l00113"></a>00113 <span class="keywordflow">return</span> qRgba( <span class="keywordtype">char</span> (Imath::clamp ( r * 84.66f, 0.f, 255.f ) ),
<a name="l00114"></a>00114 <span class="keywordtype">char</span> (Imath::clamp ( g * 84.66f, 0.f, 255.f ) ),
<a name="l00115"></a>00115 <span class="keywordtype">char</span> (Imath::clamp ( b * 84.66f, 0.f, 255.f ) ),
<a name="l00116"></a>00116 <span class="keywordtype">char</span> (Imath::clamp ( a * 84.66f, 0.f, 255.f ) ) );
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a>00119 KDE_EXPORT <span class="keywordtype">void</span> kimgio_exr_read( <a class="codeRef" doxygen="qt.tag:" href="qimageio.html">QImageIO</a> *io )
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 <span class="keywordflow">try</span>
<a name="l00122"></a>00122 {
<a name="l00123"></a>00123 <span class="keywordtype">int</span> width, height;
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">// This won't work if io is not QFile !</span>
<a name="l00126"></a>00126 RgbaInputFile file (<a class="codeRef" doxygen="qt.tag:" href="qfile.html#encodeName">QFile::encodeName</a>(io-><a class="codeRef" doxygen="qt.tag:" href="qimageio.html#fileName">fileName</a>()));
<a name="l00127"></a>00127 Imath::Box2i dw = file.dataWindow();
<a name="l00128"></a>00128
<a name="l00129"></a>00129 width = dw.max.x - dw.min.x + 1;
<a name="l00130"></a>00130 height = dw.max.y - dw.min.y + 1;
<a name="l00131"></a>00131
<a name="l00132"></a>00132 Array2D<Rgba> pixels;
<a name="l00133"></a>00133 pixels.resizeErase (height, width);
<a name="l00134"></a>00134
<a name="l00135"></a>00135 file.setFrameBuffer (&pixels[0][0] - dw.min.x - dw.min.y * width, 1, width);
<a name="l00136"></a>00136 file.readPixels (dw.min.y, dw.max.y);
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <a class="codeRef" doxygen="qt.tag:" href="qimage.html">QImage</a> image(width, height, 32, 0, QImage::BigEndian);
<a name="l00139"></a>00139 <span class="keywordflow">if</span>( image.isNull())
<a name="l00140"></a>00140 <span class="keywordflow">return</span>;
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="comment">// somehow copy pixels into image</span>
<a name="l00143"></a>00143 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> y=0; y < height; y++ ) {
<a name="l00144"></a>00144 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> x=0; x < width; x++ ) {
<a name="l00145"></a>00145 <span class="comment">// copy pixels(x,y) into image(x,y)</span>
<a name="l00146"></a>00146 image.setPixel( x, y, RgbaToQrgba( pixels[y][x] ) );
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149
<a name="l00150"></a>00150 io-><a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setImage">setImage</a>( image );
<a name="l00151"></a>00151 io-><a class="codeRef" doxygen="qt.tag:" href="qimageio.html#setStatus">setStatus</a>( 0 );
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 <span class="keywordflow">catch</span> (<span class="keyword">const</span> std::exception &exc)
<a name="l00154"></a>00154 {
<a name="l00155"></a>00155 kdDebug(399) << exc.what() << endl;
<a name="l00156"></a>00156 <span class="keywordflow">return</span>;
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159
<a name="l00160"></a>00160
<a name="l00161"></a>00161 KDE_EXPORT <span class="keywordtype">void</span> kimgio_exr_write(<a class="codeRef" doxygen="qt.tag:" href="qimageio.html">QImageIO</a> *)
<a name="l00162"></a>00162 {
<a name="l00163"></a>00163 <span class="comment">// TODO: stub</span>
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="preprocessor">#endif</span>
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