Hello all,
I am using pngwriter (v0.5.3) with libpng (v1.2.8) on a SunBlade1000
system with SunOS 5.8 as the operating system. I am recieving a
segmentation fault in all the constructors of pngwriter class. Below I
am attaching an example of log snippet from gdb.
===================================================================
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This GDB was configured as "sparc-sun-solaris2.8"...
(gdb) r 0 0 100 -0.37 -0.612 256 256 1000 test.png
Starting program: /home/r64032/fun/progs/a.out 0 0 100 -0.37 -0.612
256 256 1000 test.png
Customizing environment for Sun operating system ...
Program received signal SIGSEGV, Segmentation fault.
0x000153f0 in pngwriter::pngwriter(int, int, int, char*) (this=Cannot
access memory at address 0xf3beefd4
)
at /home/r64032/fun/share/src/pngwriter-0.5.3/src/pngwriter.cc:179
179 {
(gdb)
===================================================================
The code I am trying to compile is written below.
===================================================================
/* Creates fractals based on Julia sets and dumps the pixel
information in xpm format */
#include <iostream>
#include <pngwriter.h>
using namespace std;
// Define 24-bit true colors
#define NCOL_R 256
#define NCOL_G 256
#define NCOL_B 256
#define MAX_COLORS NCOL_R*NCOL_G*NCOL_B
double cr=0.0, ci=0.0, zoom=100, creal=-0.37, cimg=-0.617;
int w=256, h=256, max_itr=1000;
char *output_file_name="test.png";
struct color {
int red, green, blue;
};
int main (int argc, char **argv);
int recurs (double, double, int); //Mandelbrot
int recurs (double, double, double, double, int); //Julia
int main (int argc, char **argv) {
int i=0, j=0, k=0, col=0;
int dcol_r=0xffff/NCOL_R, dcol_g=0xffff/NCOL_G, dcol_b=0xffff/NCOL_B;
long int pixel;
pngwriter image (w, h, 0, output_file_name);
if (argc<9) { cout<<"USAGE: julia_xpm cr ci zoom creal cimg w h
max_itr output_file_name\n"; return 0; }
cr=atof (argv[1]);
ci=atof (argv[2]);
zoom=atof (argv[3]);
creal=atof (argv[4]);
cimg=atof (argv[5]);
w=atoi (argv[6]);
h=atoi (argv[7]);
max_itr=atoi (argv[8]);
output_file_name=argv[9];
cout<<"Arguments read successfully\n";
// create color palette
color color_palette[MAX_COLORS];
for (i=0; i<NCOL_R; i++) {
for (j=0; j<NCOL_G; j++) {
for (k=0; k<NCOL_B; k++) {
color_palette[col].red=0xffff-dcol_r*i;
color_palette[col].green=0xffff-dcol_g*j;
color_palette[col].blue=0xffff-dcol_b*k;
col++;
}
}
}
// draw the picture
for (i=0; i<h; i++) {
for (j=0; j<w; j++) {
pixel=(double) recurs (cr+(j-w/2)/zoom,
ci+(i-h/2)/zoom, creal,
cimg, max_itr)/max_itr*MAX_COLORS;
image.plot (i, j, color_palette[pixel].red,
color_palette[pixel].green, color_palette[pixel].blue);
}
}
image.close ();
return (0);
}
int recurs (double zr=0, double zi=0, int max_itr=1000) {
int n=0;
double tr=0.0, ti=0.0;
for (n=0; n<max_itr; n++){
tr=zr*zr-zi*zi;
ti=2*zr*zi;
if ((tr*tr+ti*ti)>2.0) break;
zr=tr;
zi=ti;
}
return (n);
}
int recurs (double zr=0.0, double zi=0.0, double creal=-0.37, double
cimg=-0.612, int max_itr=1000) {
int n=0;
double tr=0.0, ti=0.0;
for (n=0; n<max_itr; n++) {
tr=zr*zr-zi*zi+creal;
ti=2*zr*zi+cimg;
if ((tr*tr+ti*ti)>2.0) break;
zr=tr;
zi=ti;
}
return (n);
}
===================================================================
I am compiling the above code without any Freetype support. Can
someone help me out with what exactly is going wrong because I have
kinda givenup in figure out the reason behind the problem. Does it
have to do anything with g++ version (gnu-gcc-3.3.2)?
--
Regards
Madhur Kashyap
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