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<h1>pointillism.cpp</h1><a href="pointillism_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">//==============================================</span>
<a name="l00002"></a>00002 <span class="comment">// copyright : (C) 2003-2005 by Will Stokes</span>
<a name="l00003"></a>00003 <span class="comment">//==============================================</span>
<a name="l00004"></a>00004 <span class="comment">// This program is free software; you can redistribute it</span>
<a name="l00005"></a>00005 <span class="comment">// and/or modify it under the terms of the GNU General</span>
<a name="l00006"></a>00006 <span class="comment">// Public License as published by the Free Software</span>
<a name="l00007"></a>00007 <span class="comment">// Foundation; either version 2 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">// (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment">//==============================================</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="comment">//Systemwide includes</span>
<a name="l00012"></a>00012 <span class="preprocessor">#include <qimage.h></span>
<a name="l00013"></a>00013 <span class="preprocessor">#include <qstring.h></span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <cstdlib></span>
<a name="l00015"></a>00015 <span class="preprocessor">#include <time.h></span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="comment">//Projectwide includes</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include "<a class="code" href="pointillism_8h.html">pointillism.h</a>"</span>
<a name="l00019"></a>00019 <span class="preprocessor">#include "<a class="code" href="blackWhite_8h.html">blackWhite.h</a>"</span>
<a name="l00020"></a>00020 <span class="preprocessor">#include "<a class="code" href="manipulationOptions_8h.html">manipulationOptions.h</a>"</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">//----------------------------------------------</span>
<a name="l00023"></a>00023 <span class="comment">// Inputs:</span>
<a name="l00024"></a>00024 <span class="comment">// -------</span>
<a name="l00025"></a>00025 <span class="comment">// QString filename - location of original image on disk</span>
<a name="l00026"></a>00026 <span class="comment">// StatusWidget* status - widget for making progress visible to user</span>
<a name="l00027"></a>00027 <span class="comment">//</span>
<a name="l00028"></a>00028 <span class="comment">// Outputs:</span>
<a name="l00029"></a>00029 <span class="comment">// --------</span>
<a name="l00030"></a>00030 <span class="comment">// QImage* returned - constructed image</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00032"></a>00032 <span class="comment">// Description:</span>
<a name="l00033"></a>00033 <span class="comment">// ------------</span>
<a name="l00034"></a>00034 <span class="comment">// This method constructs an image using a pointillism approach using luminance</span>
<a name="l00035"></a>00035 <span class="comment">// data from the original image.</span>
<a name="l00036"></a>00036 <span class="comment">//</span>
<a name="l00037"></a>00037 <span class="comment">// This effect is under heavy development and will be documented </span>
<a name="l00038"></a>00038 <span class="comment">// in full when it is complete.</span>
<a name="l00039"></a>00039 <span class="comment">//----------------------------------------------</span>
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="comment">//==============================================</span>
<a name="l00042"></a><a class="code" href="pointillism_8cpp.html#3bcd2957d75fcb33f41acca28c8bbc63">00042</a> <span class="keywordtype">void</span> <a class="code" href="pointillism_8cpp.html#3bcd2957d75fcb33f41acca28c8bbc63">pickRandomPixelWithinBlock</a>( <span class="keywordtype">int</span> <a class="code" href="blur_8cpp.html#2474a5474cbff19523a51eb1de01cda4">width</a>, <span class="keywordtype">int</span> <a class="code" href="blur_8cpp.html#d12fc34ce789bce6c8a05d8a17138534">height</a>,
<a name="l00043"></a>00043 <span class="keywordtype">int</span> blockX, <span class="keywordtype">int</span> blockY,
<a name="l00044"></a>00044 <span class="keywordtype">int</span> BLOCK_SIZE,
<a name="l00045"></a>00045 <span class="keywordtype">int</span> &x, <span class="keywordtype">int</span> &y )
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 <span class="keywordtype">int</span> dx = rand() % BLOCK_SIZE;
<a name="l00048"></a>00048 <span class="keywordtype">int</span> dy = rand() % BLOCK_SIZE;
<a name="l00049"></a>00049 x = blockX*BLOCK_SIZE + dx;
<a name="l00050"></a>00050 y = blockY*BLOCK_SIZE + dy;
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keywordflow">if</span>(x < 0) x = 0;
<a name="l00053"></a>00053 <span class="keywordflow">if</span>(y < 0) y = 0;
<a name="l00054"></a>00054 <span class="keywordflow">if</span>(x >= width ) x = width-1;
<a name="l00055"></a>00055 <span class="keywordflow">if</span>(y >= height) y = height-1;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057 <span class="comment">//----------------------------------------------</span>
<a name="l00058"></a><a class="code" href="pointillism_8cpp.html#47cbb848e72d65594ce31821a72ae15e">00058</a> <span class="keywordtype">bool</span> <a class="code" href="pointillism_8cpp.html#47cbb848e72d65594ce31821a72ae15e">pixelValid</a>( QImage* image, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y )
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 <span class="keywordflow">return</span> (
<a name="l00061"></a>00061 x >= 0 &&
<a name="l00062"></a>00062 y >= 0 &&
<a name="l00063"></a>00063 x < image-><a class="code" href="blur_8cpp.html#2474a5474cbff19523a51eb1de01cda4">width</a>() &&
<a name="l00064"></a>00064 x < image-><a class="code" href="blur_8cpp.html#d12fc34ce789bce6c8a05d8a17138534">height</a>() );
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066 <span class="comment">//----------------------------------------------</span>
<a name="l00067"></a><a class="code" href="pointillism_8cpp.html#3899ac9e3314758c9e2531f614675f37">00067</a> <span class="keywordtype">double</span> <a class="code" href="pointillism_8cpp.html#3899ac9e3314758c9e2531f614675f37">computeLocalGrayVal</a>( QImage* image, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y )
<a name="l00068"></a>00068 {
<a name="l00069"></a>00069 <span class="keywordtype">int</span> weights[3][3] = { {1,2,1}, {2,4,2}, {1,2,1} };
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordtype">int</span> divisorSum = 0;
<a name="l00072"></a>00072 <span class="keywordtype">double</span> sum = 0;
<a name="l00073"></a>00073 <span class="keywordtype">int</span> xp, yp;
<a name="l00074"></a>00074 <span class="keywordflow">for</span>(yp = QMAX( y-1, 0); yp < QMIN( image->height()-1, y+1 ); yp++)
<a name="l00075"></a>00075 {
<a name="l00076"></a>00076 uchar* scanLine = image->scanLine(yp);
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="keywordflow">for</span>(xp = QMAX( x-1, 0); xp< QMIN( image->width()-1, x+1 ); xp++)
<a name="l00079"></a>00079 {
<a name="l00080"></a>00080 <span class="comment">//compute dx and dy values</span>
<a name="l00081"></a>00081 <span class="keywordtype">int</span> dx = xp - x;
<a name="l00082"></a>00082 <span class="keywordtype">int</span> dy = yp - y;
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">//compute weight index</span>
<a name="l00085"></a>00085 <span class="keywordtype">int</span> weightX = dx+1;
<a name="l00086"></a>00086 <span class="keywordtype">int</span> weightY = dy+1;
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">//update sum and divisor count </span>
<a name="l00089"></a>00089 sum+= (weights[weightX][weightY] * qGray( *((QRgb*)scanLine+xp) ) );
<a name="l00090"></a>00090 divisorSum+= weights[weightX][weightY];
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="comment">//return weighted average </span>
<a name="l00095"></a>00095 <span class="keywordflow">return</span> sum/divisorSum;
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 <span class="comment">//----------------------------------------------</span>
<a name="l00098"></a><a class="code" href="pointillism_8cpp.html#81f112ac02150cd015a661348261aa4a">00098</a> <span class="keywordtype">void</span> <a class="code" href="pointillism_8cpp.html#81f112ac02150cd015a661348261aa4a">drawDotAt</a>( QImage* image, <span class="keywordtype">int</span> x, <span class="keywordtype">int</span> y, <span class="keywordtype">int</span> )
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 <span class="comment">//TODO: antialias over grid, for now</span>
<a name="l00101"></a>00101 <span class="comment">//just update this pixel value</span>
<a name="l00102"></a>00102 uchar* scanLine = image->scanLine(y);
<a name="l00103"></a>00103 QRgb* rgb = ((QRgb*)scanLine+x);
<a name="l00104"></a>00104 <span class="keywordtype">int</span> red = qRed(*rgb);
<a name="l00105"></a>00105 red = (int) (0.6*red);
<a name="l00106"></a>00106 *rgb = qRgb( red, red, red);
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108 <span class="comment">//----------------------------------------------</span>
<a name="l00109"></a><a class="code" href="pointillism_8h.html#34b6840048618481c95bfcd7dd5892c3">00109</a> QImage* <a class="code" href="pointillism_8cpp.html#0337653a2cbb1e1547d58ac6d7b8f395">pointillismEffect</a>( QString filename, <a class="code" href="classManipulationOptions.html">ManipulationOptions</a>* )
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="comment">//intialize seed using current time</span>
<a name="l00112"></a>00112 srand( <span class="keywordtype">unsigned</span>(time(NULL)) );
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="comment">//load original image and convert to grayscale</span>
<a name="l00115"></a>00115 QImage* originalImage = <a class="code" href="blackWhite_8cpp.html#81188751080c22115720554f1ce6a30f">blackWhiteEffect</a>( filename, NULL );
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">//construct edited image</span>
<a name="l00118"></a>00118 QImage* <a class="code" href="redEye__internal_8h.html#63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a> = <span class="keyword">new</span> QImage( originalImage->width(),
<a name="l00119"></a>00119 originalImage->height(),
<a name="l00120"></a>00120 originalImage->depth() );
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">//fill with white since we'll be drawing black/color dots on top</span>
<a name="l00123"></a>00123 editedImage->fill( qRgb(255,255,255) );
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">//break image into BLOCK_SIZE x BLOCK_SIZE blocks. iterate over</span>
<a name="l00126"></a>00126 <span class="comment">//each block and pick a random pixel within. Local</span>
<a name="l00127"></a>00127 <span class="comment">//average gray value in edited image is > originalImage + thresh</span>
<a name="l00128"></a>00128 <span class="comment">//then draw a dot at pixel. continue doing this for each block</span>
<a name="l00129"></a>00129 <span class="comment">//and repeat until ???</span>
<a name="l00130"></a>00130 <span class="keyword">const</span> <span class="keywordtype">int</span> BLOCK_SIZE = 8;
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="comment">//compute image size in blocks</span>
<a name="l00133"></a>00133 <span class="keywordtype">int</span> blocksWide = editedImage->width() / BLOCK_SIZE;
<a name="l00134"></a>00134 <span class="keywordflow">if</span>(blocksWide*BLOCK_SIZE < editedImage-><a class="code" href="blur_8cpp.html#2474a5474cbff19523a51eb1de01cda4">width</a>())
<a name="l00135"></a>00135 { blocksWide++; }
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keywordtype">int</span> blocksTall = editedImage->height() / BLOCK_SIZE;
<a name="l00138"></a>00138 <span class="keywordflow">if</span>(blocksTall*BLOCK_SIZE < editedImage-><a class="code" href="blur_8cpp.html#d12fc34ce789bce6c8a05d8a17138534">height</a>())
<a name="l00139"></a>00139 { blocksTall++; }
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="comment">//iterate over image say 100 times, we'll need to fix this outer loop to be smarter?</span>
<a name="l00142"></a>00142 <span class="keywordtype">int</span> bx,by,x,y;
<a name="l00143"></a>00143 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i<10; i++)
<a name="l00144"></a>00144 {
<a name="l00145"></a>00145 <span class="comment">//iterate over all blocks</span>
<a name="l00146"></a>00146 <span class="keywordflow">for</span>(bx=0; bx<blocksWide; bx++)
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 <span class="keywordflow">for</span>(by=0; by<blocksTall; by++)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 <span class="comment">//pick random pixel within block</span>
<a name="l00151"></a>00151 <a class="code" href="pointillism_8cpp.html#3bcd2957d75fcb33f41acca28c8bbc63">pickRandomPixelWithinBlock</a>( editedImage->width(),
<a name="l00152"></a>00152 editedImage->height(),
<a name="l00153"></a>00153 bx, by,
<a name="l00154"></a>00154 BLOCK_SIZE,
<a name="l00155"></a>00155 x, y );
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="keywordtype">double</span> curGrayVal = <a class="code" href="pointillism_8cpp.html#3899ac9e3314758c9e2531f614675f37">computeLocalGrayVal</a>( editedImage, x, y );
<a name="l00158"></a>00158 <span class="keywordtype">double</span> goalGrayVal = <a class="code" href="pointillism_8cpp.html#3899ac9e3314758c9e2531f614675f37">computeLocalGrayVal</a>( originalImage, x, y );
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">//too bright -> draw dot</span>
<a name="l00161"></a>00161 <span class="keywordflow">if</span>( curGrayVal > goalGrayVal )
<a name="l00162"></a>00162 { <a class="code" href="pointillism_8cpp.html#81f112ac02150cd015a661348261aa4a">drawDotAt</a>( editedImage, x, y, 5 ); }
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="comment">//free grayscale form of original image</span>
<a name="l00168"></a>00168 <span class="keyword">delete</span> originalImage;
<a name="l00169"></a>00169 originalImage = NULL;
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="comment">//return pointer to edited image</span>
<a name="l00172"></a>00172 <span class="keywordflow">return</span> editedImage;
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174 <span class="comment">//==============================================</span>
</pre></div></div>
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Mandriva
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