106 lines
2.0 KiB
C
106 lines
2.0 KiB
C
/*
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*
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* $Id: blur.c,v 1.3 2002-04-16 16:08:18 bdenney Exp $
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*
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*/
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#include <stdio.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <assert.h>
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#define MAX 128
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int array[MAX][MAX];
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int array2[MAX][MAX];
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#define BLUR_SIZE 3
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#define BLUR_WINDOW_HALF 1
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#define DEFAULT_TIMES 1000
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#ifdef BLUR_USE_FUNCTION_CALL
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void blur_func (int *sum, int *data)
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{
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*sum += *data;
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}
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#endif
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void blur()
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{
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int sum;
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int x,y,x2,y2;
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for (x=1; x<MAX-1; x++)
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for (y=1; y<MAX-1; y++)
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{
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sum = 0;
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for (x2=x-BLUR_WINDOW_HALF; x2<=x+BLUR_WINDOW_HALF; x2++)
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for (y2=y-BLUR_WINDOW_HALF; y2<=y+BLUR_WINDOW_HALF; y2++) {
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#ifdef BLUR_USE_FUNCTION_CALL
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blur_func (&sum, &array[x2][y2]);
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#else
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sum += array[x2][y2];
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#endif
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}
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array2[x][y] = sum;
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}
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}
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void fill_array()
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{
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int x,y;
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for (x=0; x<MAX; x++)
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for (y=0; y<MAX; y++)
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array[x][y] = (x*17+y*31)%29;
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}
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void dump_array (FILE *fp)
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{
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int x,y;
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for (x=0; x<MAX; x++) {
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for (y=0; y<MAX; y++) {
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fprintf (fp, "%3d ", array[x][y]);
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}
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fprintf (fp, "\n");
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}
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}
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struct timeval start, stop;
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#define start_timer() gettimeofday (&start, NULL);
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#define stop_timer() gettimeofday (&stop, NULL);
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void report_time (FILE *fp, int iters)
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{
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int usec_duration =
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(stop.tv_sec*1000000 + stop.tv_usec)
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- (start.tv_sec*1000000 + start.tv_usec);
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double sec = (double)usec_duration / 1.0e3;
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double sec_per_iter = sec / (double)iters;
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fprintf (fp, "Total time elapsed = %f msec\n", sec);
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fprintf (fp, "Iterations = %d\n", iters);
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fprintf (fp, "Time per iteration = %f msec\n", sec_per_iter);
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}
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int main (int argc, char *argv[])
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{
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int i;
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int times = 0;
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FILE *out;
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if (argc>1) {
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assert (sscanf (argv[1], "%d", ×) == 1);
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} else {
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times = DEFAULT_TIMES;
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}
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fill_array();
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//dump_array (stderr);
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start_timer();
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for (i=0; i<times; i++)
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blur();
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stop_timer();
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report_time (stdout, times);
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//fprintf (stderr, "-----------------------------------\n");
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out = fopen ("blur.out", "w");
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assert (out != NULL);
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dump_array (out);
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fclose (out);
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return 0;
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}
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