alphablending.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
//#include "tools.h"
 
extern void alphablending(unsigned int n, float src1[n], float src2[n], float result[n], float alpha);
 
int main(int argc, char **argv)
{
        unsigned int n;
        int r;
        float *src1, *src2, *result;
        float alpha;
        n = atoi(argv[1]);
        printf(">>>> %d <<<<\n", n);
        alpha = 0.7;
 
#define xmalloc(p)                                                      \
        do {                                                            \
                if (posix_memalign((void **) &p, 32, n * sizeof(float))) \
                        return 3;                                       \
        } while(0);
 
        xmalloc(src1);
        xmalloc(src2);
        xmalloc(result);
 
        init_data_file(argv[2]);
        init_data_float(src1, n);
        init_data_float(src2, n);
        close_data_file();
 
        alphablending(n, src1, src2, result, alpha);
 
        print_array_float("result", result, n);
 
        free(src1);
        free(src2);
 
        r = (int) (result[0] + result[n - 1]);
        free(result);
 
        return 0;
}
 
void alphablending(unsigned int n, float src1[n], float src2[n], float result[n], float alpha)
{
    unsigned int i,j;
    for(i=0;i<n;i++)
        result[i]=alpha*src1[i]+(1-alpha)*src2[i];
}