// C code for Image::Filter::Blur
// Simple Black & White Blur
// (c) 2002 - Hendrik Van Belleghem
// hendrik@quickndirty.org
// Released under the GPL
#include <math.h>
#include <stdio.h>
#include "gd.h"
gdImagePtr blur_bw (gdImagePtr imageptr)
{ gdImagePtr imblur;
int dimx = 0;
int dimy = 0;
int w = 0;
int h = 0;
int index = 0;
int newcolor = 0;
dimx = gdImageSX(imageptr);
dimy = gdImageSY(imageptr);
imblur = gdImageCreateTrueColor(dimx,dimy);
for (w = 0; w < dimx ; w++)
{ for (h = 0; h < dimy ; h++)
{ newcolor = (int) (
gdImageRed(imageptr,gdImageGetPixel(imageptr,w-1,h-1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w-1,h))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w-1,h+1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w,h-1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w,h))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w,h+1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w+1,h-1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w+1,h))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w+1,h+1)) )/9;
newcolor = newcolor > 255 ? 255 : (newcolor < 0 ? 0 : newcolor);
index = gdImageColorExact(imblur,newcolor,newcolor,newcolor);
if (index == -1) { index = gdImageColorAllocate(imblur,newcolor,newcolor,newcolor); }
gdImageSetPixel(imblur,w,h,index);
}
}
return imblur;
}
gdImagePtr blur_color (gdImagePtr imageptr)
{ gdImagePtr imblur;
int dimx = 0;
int dimy = 0;
int w = 0;
int h = 0;
int index = 0;
int newrcolor = 0;
int newgcolor = 0;
int newbcolor = 0;
dimx = gdImageSX(imageptr);
dimy = gdImageSY(imageptr);
imblur = gdImageCreateTrueColor(dimx,dimy);
for (w = 0; w < dimx ; w++)
{ for (h = 0; h < dimy ; h++)
{ newrcolor = (int) (
gdImageRed(imageptr,gdImageGetPixel(imageptr,w-1,h-1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w-1,h))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w-1,h+1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w,h-1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w,h))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w,h+1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w+1,h-1))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w+1,h))+
gdImageRed(imageptr,gdImageGetPixel(imageptr,w+1,h+1)) )/9;
newgcolor = (int) (
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w-1,h-1))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w-1,h))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w-1,h+1))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w,h-1))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w,h))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w,h+1))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w+1,h-1))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w+1,h))+
gdImageGreen(imageptr,gdImageGetPixel(imageptr,w+1,h+1)) )/9;
newbcolor = (int) (
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w-1,h-1))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w-1,h))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w-1,h+1))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w,h-1))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w,h))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w,h+1))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w+1,h-1))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w+1,h))+
gdImageBlue(imageptr,gdImageGetPixel(imageptr,w+1,h+1)) )/9;
newrcolor = newrcolor > 255 ? 255 : (newrcolor < 0 ? 0 : newrcolor);
newgcolor = newgcolor > 255 ? 255 : (newgcolor < 0 ? 0 : newgcolor);
newbcolor = newbcolor > 255 ? 255 : (newbcolor < 0 ? 0 : newbcolor);
index = gdImageColorExact(imblur,newrcolor,newgcolor,newbcolor);
if (index == -1) { index = gdImageColorAllocate(imblur,newrcolor,newgcolor,newbcolor); }
gdImageSetPixel(imblur,w,h,index);
}
}
return imblur;
}
gdImagePtr blur (gdImagePtr imageptr, int type)
{ gdImagePtr imblur;
if (type == 1)
{ imblur = blur_bw(imageptr); }
else { imblur = blur_color(imageptr); }
return imblur;
}