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<div class="title">image.cpp</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * This file is part of the KDE libraries</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (c) 2001 Michael Goffioul <kdeprint@swing.be></span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00006"></a>00006 <span class="comment"> * modify it under the terms of the GNU Library General Public</span>
<a name="l00007"></a>00007 <span class="comment"> * License version 2 as published by the Free Software Foundation.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * This library is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00012"></a>00012 <span class="comment"> * Library General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * You should have received a copy of the GNU Library General Public License</span>
<a name="l00015"></a>00015 <span class="comment"> * along with this library; see the file COPYING.LIB. If not, write to</span>
<a name="l00016"></a>00016 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="l00017"></a>00017 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00018"></a>00018 <span class="comment"> **/</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#include <qimage.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <math.h></span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="keywordtype">void</span>
<a name="l00024"></a>00024 mult(<span class="keywordtype">float</span> a[3][3], <span class="comment">/* I - First matrix */</span>
<a name="l00025"></a>00025 <span class="keywordtype">float</span> b[3][3], <span class="comment">/* I - Second matrix */</span>
<a name="l00026"></a>00026 <span class="keywordtype">float</span> c[3][3]) <span class="comment">/* I - Destination matrix */</span>
<a name="l00027"></a>00027 {
<a name="l00028"></a>00028 <span class="keywordtype">int</span> x, y; <span class="comment">/* Looping vars */</span>
<a name="l00029"></a>00029 <span class="keywordtype">float</span> temp[3][3]; <span class="comment">/* Temporary matrix */</span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">/*</span>
<a name="l00033"></a>00033 <span class="comment"> * Multiply a and b, putting the result in temp...</span>
<a name="l00034"></a>00034 <span class="comment"> */</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="keywordflow">for</span> (y = 0; y < 3; y ++)
<a name="l00037"></a>00037 <span class="keywordflow">for</span> (x = 0; x < 3; x ++)
<a name="l00038"></a>00038 temp[y][x] = b[y][0] * a[0][x] +
<a name="l00039"></a>00039 b[y][1] * a[1][x] +
<a name="l00040"></a>00040 b[y][2] * a[2][x];
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="comment">/*</span>
<a name="l00043"></a>00043 <span class="comment"> * Copy temp to c (that way c can be a pointer to a or b).</span>
<a name="l00044"></a>00044 <span class="comment"> */</span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 memcpy(c, temp, <span class="keyword">sizeof</span>(temp));
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keywordtype">void</span>
<a name="l00050"></a>00050 saturate(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix to append to */</span>
<a name="l00051"></a>00051 <span class="keywordtype">float</span> sat) <span class="comment">/* I - Desired color saturation */</span>
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 <span class="keywordtype">float</span> smat[3][3]; <span class="comment">/* Saturation matrix */</span>
<a name="l00054"></a>00054
<a name="l00055"></a>00055
<a name="l00056"></a>00056 smat[0][0] = (1.0 - sat) * 0.3086 + sat;
<a name="l00057"></a>00057 smat[0][1] = (1.0 - sat) * 0.3086;
<a name="l00058"></a>00058 smat[0][2] = (1.0 - sat) * 0.3086;
<a name="l00059"></a>00059 smat[1][0] = (1.0 - sat) * 0.6094;
<a name="l00060"></a>00060 smat[1][1] = (1.0 - sat) * 0.6094 + sat;
<a name="l00061"></a>00061 smat[1][2] = (1.0 - sat) * 0.6094;
<a name="l00062"></a>00062 smat[2][0] = (1.0 - sat) * 0.0820;
<a name="l00063"></a>00063 smat[2][1] = (1.0 - sat) * 0.0820;
<a name="l00064"></a>00064 smat[2][2] = (1.0 - sat) * 0.0820 + sat;
<a name="l00065"></a>00065
<a name="l00066"></a>00066 mult(smat, mat, mat);
<a name="l00067"></a>00067 }
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="keywordtype">void</span>
<a name="l00070"></a>00070 xform(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix */</span>
<a name="l00071"></a>00071 <span class="keywordtype">float</span> x, <span class="comment">/* I - Input X coordinate */</span>
<a name="l00072"></a>00072 <span class="keywordtype">float</span> y, <span class="comment">/* I - Input Y coordinate */</span>
<a name="l00073"></a>00073 <span class="keywordtype">float</span> z, <span class="comment">/* I - Input Z coordinate */</span>
<a name="l00074"></a>00074 <span class="keywordtype">float</span> *tx, <span class="comment">/* O - Output X coordinate */</span>
<a name="l00075"></a>00075 <span class="keywordtype">float</span> *ty, <span class="comment">/* O - Output Y coordinate */</span>
<a name="l00076"></a>00076 <span class="keywordtype">float</span> *tz) <span class="comment">/* O - Output Z coordinate */</span>
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 *tx = x * mat[0][0] + y * mat[1][0] + z * mat[2][0];
<a name="l00079"></a>00079 *ty = x * mat[0][1] + y * mat[1][1] + z * mat[2][1];
<a name="l00080"></a>00080 *tz = x * mat[0][2] + y * mat[1][2] + z * mat[2][2];
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordtype">void</span>
<a name="l00084"></a>00084 xrotate(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix */</span>
<a name="l00085"></a>00085 <span class="keywordtype">float</span> rs, <span class="comment">/* I - Rotation angle sine */</span>
<a name="l00086"></a>00086 <span class="keywordtype">float</span> rc) <span class="comment">/* I - Rotation angle cosine */</span>
<a name="l00087"></a>00087 {
<a name="l00088"></a>00088 <span class="keywordtype">float</span> rmat[3][3]; <span class="comment">/* I - Rotation matrix */</span>
<a name="l00089"></a>00089
<a name="l00090"></a>00090
<a name="l00091"></a>00091 rmat[0][0] = 1.0;
<a name="l00092"></a>00092 rmat[0][1] = 0.0;
<a name="l00093"></a>00093 rmat[0][2] = 0.0;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 rmat[1][0] = 0.0;
<a name="l00096"></a>00096 rmat[1][1] = rc;
<a name="l00097"></a>00097 rmat[1][2] = rs;
<a name="l00098"></a>00098
<a name="l00099"></a>00099 rmat[2][0] = 0.0;
<a name="l00100"></a>00100 rmat[2][1] = -rs;
<a name="l00101"></a>00101 rmat[2][2] = rc;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 mult(rmat, mat, mat);
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keywordtype">void</span>
<a name="l00107"></a>00107 yrotate(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix */</span>
<a name="l00108"></a>00108 <span class="keywordtype">float</span> rs, <span class="comment">/* I - Rotation angle sine */</span>
<a name="l00109"></a>00109 <span class="keywordtype">float</span> rc) <span class="comment">/* I - Rotation angle cosine */</span>
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="keywordtype">float</span> rmat[3][3]; <span class="comment">/* I - Rotation matrix */</span>
<a name="l00112"></a>00112
<a name="l00113"></a>00113
<a name="l00114"></a>00114 rmat[0][0] = rc;
<a name="l00115"></a>00115 rmat[0][1] = 0.0;
<a name="l00116"></a>00116 rmat[0][2] = -rs;
<a name="l00117"></a>00117
<a name="l00118"></a>00118 rmat[1][0] = 0.0;
<a name="l00119"></a>00119 rmat[1][1] = 1.0;
<a name="l00120"></a>00120 rmat[1][2] = 0.0;
<a name="l00121"></a>00121
<a name="l00122"></a>00122 rmat[2][0] = rs;
<a name="l00123"></a>00123 rmat[2][1] = 0.0;
<a name="l00124"></a>00124 rmat[2][2] = rc;
<a name="l00125"></a>00125
<a name="l00126"></a>00126 mult(rmat,mat,mat);
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="keywordtype">void</span>
<a name="l00130"></a>00130 zrotate(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix */</span>
<a name="l00131"></a>00131 <span class="keywordtype">float</span> rs, <span class="comment">/* I - Rotation angle sine */</span>
<a name="l00132"></a>00132 <span class="keywordtype">float</span> rc) <span class="comment">/* I - Rotation angle cosine */</span>
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134 <span class="keywordtype">float</span> rmat[3][3]; <span class="comment">/* I - Rotation matrix */</span>
<a name="l00135"></a>00135
<a name="l00136"></a>00136
<a name="l00137"></a>00137 rmat[0][0] = rc;
<a name="l00138"></a>00138 rmat[0][1] = rs;
<a name="l00139"></a>00139 rmat[0][2] = 0.0;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 rmat[1][0] = -rs;
<a name="l00142"></a>00142 rmat[1][1] = rc;
<a name="l00143"></a>00143 rmat[1][2] = 0.0;
<a name="l00144"></a>00144
<a name="l00145"></a>00145 rmat[2][0] = 0.0;
<a name="l00146"></a>00146 rmat[2][1] = 0.0;
<a name="l00147"></a>00147 rmat[2][2] = 1.0;
<a name="l00148"></a>00148
<a name="l00149"></a>00149 mult(rmat,mat,mat);
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151
<a name="l00152"></a>00152 <span class="keywordtype">void</span>
<a name="l00153"></a>00153 zshear(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix */</span>
<a name="l00154"></a>00154 <span class="keywordtype">float</span> dx, <span class="comment">/* I - X shear */</span>
<a name="l00155"></a>00155 <span class="keywordtype">float</span> dy) <span class="comment">/* I - Y shear */</span>
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 <span class="keywordtype">float</span> smat[3][3]; <span class="comment">/* Shear matrix */</span>
<a name="l00158"></a>00158
<a name="l00159"></a>00159
<a name="l00160"></a>00160 smat[0][0] = 1.0;
<a name="l00161"></a>00161 smat[0][1] = 0.0;
<a name="l00162"></a>00162 smat[0][2] = dx;
<a name="l00163"></a>00163
<a name="l00164"></a>00164 smat[1][0] = 0.0;
<a name="l00165"></a>00165 smat[1][1] = 1.0;
<a name="l00166"></a>00166 smat[1][2] = dy;
<a name="l00167"></a>00167
<a name="l00168"></a>00168 smat[2][0] = 0.0;
<a name="l00169"></a>00169 smat[2][1] = 0.0;
<a name="l00170"></a>00170 smat[2][2] = 1.0;
<a name="l00171"></a>00171
<a name="l00172"></a>00172 mult(smat, mat, mat);
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="keywordtype">void</span>
<a name="l00176"></a>00176 huerotate(<span class="keywordtype">float</span> mat[3][3], <span class="comment">/* I - Matrix to append to */</span>
<a name="l00177"></a>00177 <span class="keywordtype">float</span> rot) <span class="comment">/* I - Hue rotation in degrees */</span>
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 <span class="keywordtype">float</span> hmat[3][3] = {{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0}}; <span class="comment">/* Hue matrix */</span>
<a name="l00180"></a>00180 <span class="keywordtype">float</span> lx, ly, lz; <span class="comment">/* Luminance vector */</span>
<a name="l00181"></a>00181 <span class="keywordtype">float</span> xrs, xrc; <span class="comment">/* X rotation sine/cosine */</span>
<a name="l00182"></a>00182 <span class="keywordtype">float</span> yrs, yrc; <span class="comment">/* Y rotation sine/cosine */</span>
<a name="l00183"></a>00183 <span class="keywordtype">float</span> zrs, zrc; <span class="comment">/* Z rotation sine/cosine */</span>
<a name="l00184"></a>00184 <span class="keywordtype">float</span> zsx, zsy; <span class="comment">/* Z shear x/y */</span>
<a name="l00185"></a>00185
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="comment">/*</span>
<a name="l00188"></a>00188 <span class="comment"> * Rotate the gray vector into positive Z...</span>
<a name="l00189"></a>00189 <span class="comment"> */</span>
<a name="l00190"></a>00190
<a name="l00191"></a>00191 xrs = M_SQRT1_2;
<a name="l00192"></a>00192 xrc = M_SQRT1_2;
<a name="l00193"></a>00193 xrotate(hmat,xrs,xrc);
<a name="l00194"></a>00194
<a name="l00195"></a>00195 yrs = -1.0 / sqrt(3.0);
<a name="l00196"></a>00196 yrc = -M_SQRT2 * yrs;
<a name="l00197"></a>00197 yrotate(hmat,yrs,yrc);
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="comment">/*</span>
<a name="l00200"></a>00200 <span class="comment"> * Shear the space to make the luminance plane horizontal...</span>
<a name="l00201"></a>00201 <span class="comment"> */</span>
<a name="l00202"></a>00202
<a name="l00203"></a>00203 xform(hmat, 0.3086, 0.6094, 0.0820, &lx, &ly, &lz);
<a name="l00204"></a>00204 zsx = lx / lz;
<a name="l00205"></a>00205 zsy = ly / lz;
<a name="l00206"></a>00206 zshear(hmat, zsx, zsy);
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="comment">/*</span>
<a name="l00209"></a>00209 <span class="comment"> * Rotate the hue...</span>
<a name="l00210"></a>00210 <span class="comment"> */</span>
<a name="l00211"></a>00211
<a name="l00212"></a>00212 zrs = sin(rot * M_PI / 180.0);
<a name="l00213"></a>00213 zrc = cos(rot * M_PI / 180.0);
<a name="l00214"></a>00214
<a name="l00215"></a>00215 zrotate(hmat, zrs, zrc);
<a name="l00216"></a>00216
<a name="l00217"></a>00217 <span class="comment">/*</span>
<a name="l00218"></a>00218 <span class="comment"> * Unshear the space to put the luminance plane back...</span>
<a name="l00219"></a>00219 <span class="comment"> */</span>
<a name="l00220"></a>00220
<a name="l00221"></a>00221 zshear(hmat, -zsx, -zsy);
<a name="l00222"></a>00222
<a name="l00223"></a>00223 <span class="comment">/*</span>
<a name="l00224"></a>00224 <span class="comment"> * Rotate the gray vector back into place...</span>
<a name="l00225"></a>00225 <span class="comment"> */</span>
<a name="l00226"></a>00226
<a name="l00227"></a>00227 yrotate(hmat, -yrs, yrc);
<a name="l00228"></a>00228 xrotate(hmat, -xrs, xrc);
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="comment">/*</span>
<a name="l00231"></a>00231 <span class="comment"> * Append it to the current matrix...</span>
<a name="l00232"></a>00232 <span class="comment"> */</span>
<a name="l00233"></a>00233
<a name="l00234"></a>00234 mult(hmat, mat, mat);
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="keywordtype">void</span>
<a name="l00238"></a>00238 bright(<span class="keywordtype">float</span> mat[3][3],
<a name="l00239"></a>00239 <span class="keywordtype">float</span> scale)
<a name="l00240"></a>00240 {
<a name="l00241"></a>00241 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0;i<3;i++)
<a name="l00242"></a>00242 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j=0;j<3;j++)
<a name="l00243"></a>00243 mat[i][j] *= scale;
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245
<a name="l00246"></a>00246 <span class="comment">//----------------------------------------------------------------------------------------------------</span>
<a name="l00247"></a>00247
<a name="l00248"></a>00248 <a class="codeRef" href="qimage.html">QImage</a> convertImage(<span class="keyword">const</span> <a class="codeRef" href="qimage.html">QImage</a>& image, <span class="keywordtype">int</span> hue, <span class="keywordtype">int</span> saturation, <span class="keywordtype">int</span> brightness, <span class="keywordtype">int</span> gamma)
<a name="l00249"></a>00249 {
<a name="l00250"></a>00250 <span class="keywordtype">float</span> mat[3][3] = {{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0}};
<a name="l00251"></a>00251 <span class="keywordtype">int</span> lut[3][3][256];
<a name="l00252"></a>00252 QRgb c;
<a name="l00253"></a>00253 <span class="keywordtype">int</span> r,g,b,v,r2,g2,b2;
<a name="l00254"></a>00254 <span class="keywordtype">float</span> gam = 1.0/(float(gamma)/1000.0);
<a name="l00255"></a>00255 <a class="codeRef" href="qimage.html">QImage</a> img(image);
<a name="l00256"></a>00256
<a name="l00257"></a>00257 saturate(mat,saturation*0.01);
<a name="l00258"></a>00258 huerotate(mat,(<span class="keywordtype">float</span>)hue);
<a name="l00259"></a>00259 bright(mat,brightness*0.01);
<a name="l00260"></a>00260 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 3; i ++)
<a name="l00261"></a>00261 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < 3; j ++)
<a name="l00262"></a>00262 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k < 256; k ++)
<a name="l00263"></a>00263 lut[i][j][k] = (<span class="keywordtype">int</span>)(mat[i][j] * k + 0.5);
<a name="l00264"></a>00264
<a name="l00265"></a>00265 img.detach();
<a name="l00266"></a>00266 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0;i<image.<a class="codeRef" href="qimage.html#width">width</a>();i++)
<a name="l00267"></a>00267 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j=0;j<image.<a class="codeRef" href="qimage.html#height">height</a>();j++)
<a name="l00268"></a>00268 {
<a name="l00269"></a>00269 c = image.<a class="codeRef" href="qimage.html#pixel">pixel</a>(i,j);
<a name="l00270"></a>00270 r = qRed(c);
<a name="l00271"></a>00271 g = qGreen(c);
<a name="l00272"></a>00272 b = qBlue(c);
<a name="l00273"></a>00273
<a name="l00274"></a>00274 v = lut[0][0][r] + lut[1][0][g] + lut[2][0][b];
<a name="l00275"></a>00275 <span class="keywordflow">if</span> (gamma != 1000) v = (int)rint(pow(v,gam));
<a name="l00276"></a>00276 <span class="keywordflow">if</span> (v < 0) r2 = 0;
<a name="l00277"></a>00277 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (v > 255) r2 = 255;
<a name="l00278"></a>00278 <span class="keywordflow">else</span> r2 = v;
<a name="l00279"></a>00279
<a name="l00280"></a>00280 v = lut[0][1][r] + lut[1][1][g] + lut[2][1][b];
<a name="l00281"></a>00281 <span class="keywordflow">if</span> (gamma != 1000) v = (int)rint(pow(v,gam));
<a name="l00282"></a>00282 <span class="keywordflow">if</span> (v < 0) g2 = 0;
<a name="l00283"></a>00283 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (v > 255) g2 = 255;
<a name="l00284"></a>00284 <span class="keywordflow">else</span> g2 = v;
<a name="l00285"></a>00285
<a name="l00286"></a>00286 v = lut[0][2][r] + lut[1][2][g] + lut[2][2][b];
<a name="l00287"></a>00287 <span class="keywordflow">if</span> (gamma != 1000) v = (int)rint(pow(v,gam));
<a name="l00288"></a>00288 <span class="keywordflow">if</span> (v < 0) b2 = 0;
<a name="l00289"></a>00289 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (v > 255) b2 = 255;
<a name="l00290"></a>00290 <span class="keywordflow">else</span> b2 = v;
<a name="l00291"></a>00291
<a name="l00292"></a>00292 img.setPixel(i,j,qRgb(r2,g2,b2));
<a name="l00293"></a>00293 }
<a name="l00294"></a>00294 <span class="keywordflow">return</span> img;
<a name="l00295"></a>00295 }
</pre></div></div>
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