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main.cpp
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main.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <complex.h>
#define DIM 2000
extern "C"
{
#include <jpeglib.h>
}
int julia(int x, int y) {
const double scale = 1.5;
double jx = scale * (DIM / 2 - x)/(DIM/2);
double jy = scale * (DIM / 2 - y)/(DIM/2);
double complex c = -0.8 + 0.156 * I;
double complex a = jx + jy * I;
int i = 0;
for (i = 0; i < 200; i++) {
a = a * a + c;
if (cabs(a) * cabs(a) > 1000)
return 0;
}
return 1;
}
int main(void) {
int width = DIM;
int height = DIM;
int quality = 75;
char *scr=(char*)malloc(width*height*3);
FILE* outfile = fopen("out.jpg", "wb");
for (int i=0;i<width;i++)
for (int j=0;j<height;j++) {
char *p = scr + j * width * 3 + i * 3;
*p = julia(i, j) * 255;
p++;
*p = 0;
p++;
*p = 0;
}
/* Compress to JPEG */
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, outfile);
cinfo.image_width=width;
cinfo.image_height=height;
cinfo.input_components=3;
cinfo.in_color_space=JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, quality, true);
jpeg_start_compress(&cinfo, TRUE);
JSAMPROW row_pointer[1];
int row_stride;
row_stride = cinfo.image_width*3;
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer[0]=(JSAMPLE *)(scr+cinfo.next_scanline*row_stride);
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
free(scr);
return 0;
}