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00012 #include <qimage.h>
00013 #include <qstring.h>
00014 #include <cstdlib>
00015 #include <time.h>
00016
00017
00018 #include "pointillism.h"
00019 #include "blackWhite.h"
00020 #include "../../gui/statusWidget.h"
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00041
00042 void pickRandomPixelWithinBlock( int width, int height,
00043 int blockX, int blockY,
00044 int BLOCK_SIZE,
00045 int &x, int &y )
00046 {
00047 int dx = rand() % BLOCK_SIZE;
00048 int dy = rand() % BLOCK_SIZE;
00049 x = blockX*BLOCK_SIZE + dx;
00050 y = blockY*BLOCK_SIZE + dy;
00051
00052 if(x < 0) x = 0;
00053 if(y < 0) y = 0;
00054 if(x >= width ) x = width-1;
00055 if(y >= height) y = height-1;
00056 }
00057
00058 bool pixelValid( QImage* image, int x, int y )
00059 {
00060 return (
00061 x >= 0 &&
00062 y >= 0 &&
00063 x < image->width() &&
00064 x < image->height() );
00065 }
00066
00067 double computeLocalGrayVal( QImage* image, int x, int y )
00068 {
00069 int weights[3][3] = { {1,2,1}, {2,4,2}, {1,2,1} };
00070
00071 int divisorSum = 0;
00072 double sum = 0;
00073 int xp, yp;
00074 for(yp = QMAX( y-1, 0); yp < QMIN( image->height()-1, y+1 ); yp++)
00075 {
00076 uchar* scanLine = image->scanLine(yp);
00077
00078 for(xp = QMAX( x-1, 0); xp< QMIN( image->width()-1, x+1 ); xp++)
00079 {
00080
00081 int dx = xp - x;
00082 int dy = yp - y;
00083
00084
00085 int weightX = dx+1;
00086 int weightY = dy+1;
00087
00088
00089 sum+= (weights[weightX][weightY] * qGray( *((QRgb*)scanLine+xp) ) );
00090 divisorSum+= weights[weightX][weightY];
00091 }
00092 }
00093
00094
00095 return sum/divisorSum;
00096 }
00097
00098 void drawDotAt( QImage* image, int x, int y, int )
00099 {
00100
00101
00102 uchar* scanLine = image->scanLine(y);
00103 QRgb* rgb = ((QRgb*)scanLine+x);
00104 int red = qRed(*rgb);
00105 red = (int) (0.6*red);
00106 *rgb = qRgb( red, red, red);
00107 }
00108
00109 QImage* pointillismEffect( QString filename, StatusWidget* )
00110 {
00111
00112 srand( unsigned(time(NULL)) );
00113
00114
00115 QImage* originalImage = blackWhiteEffect( filename, NULL );
00116
00117
00118 QImage* editedImage = new QImage( originalImage->width(),
00119 originalImage->height(),
00120 originalImage->depth() );
00121
00122
00123 editedImage->fill( qRgb(255,255,255) );
00124
00125
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00129
00130 const int BLOCK_SIZE = 8;
00131
00132
00133 int blocksWide = editedImage->width() / BLOCK_SIZE;
00134 if(blocksWide*BLOCK_SIZE < editedImage->width())
00135 { blocksWide++; }
00136
00137 int blocksTall = editedImage->height() / BLOCK_SIZE;
00138 if(blocksTall*BLOCK_SIZE < editedImage->height())
00139 { blocksTall++; }
00140
00141
00142 int bx,by,x,y;
00143 for(int i=0; i<10; i++)
00144 {
00145
00146 for(bx=0; bx<blocksWide; bx++)
00147 {
00148 for(by=0; by<blocksTall; by++)
00149 {
00150
00151 pickRandomPixelWithinBlock( editedImage->width(),
00152 editedImage->height(),
00153 bx, by,
00154 BLOCK_SIZE,
00155 x, y );
00156
00157 double curGrayVal = computeLocalGrayVal( editedImage, x, y );
00158 double goalGrayVal = computeLocalGrayVal( originalImage, x, y );
00159
00160
00161 if( curGrayVal > goalGrayVal )
00162 { drawDotAt( editedImage, x, y, 5 ); }
00163 }
00164 }
00165 }
00166
00167
00168 delete originalImage;
00169 originalImage = NULL;
00170
00171
00172 return editedImage;
00173 }
00174