ADD file via upload

step2.c

@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define BUF_SIZE 3
+#define WRAPPED(i) ((i) % BUF_SIZE)
+
+void applySeparableGaussianBlur(float src[5][5], float dst[5][5], int h, int w, float kx[3], float ky[3]) {
+    float buf[BUF_SIZE][5]; 
+
+    
+    int i;
+    for (i = 1; i < h-1; i++) {
+        int bufIndex = WRAPPED(i);
+        int j;
+        for (j = 1; j < w-1; j++) {
+            buf[bufIndex][j] = kx[0] * (src[i-1][j] + src[i+1][j]) +
+                               kx[1] * (src[i][j-1] + src[i][j+1]) +
+                               kx[2] * (src[i-1][j-1] + src[i-1][j+1] + src[i+1][j-1] + src[i+1][j+1]);
+        }
+        
+        buf[bufIndex][0] = buf[bufIndex][1];
+        buf[bufIndex][w-1] = buf[bufIndex][w-2];
+    }
+
+    
+    int j;
+    for ( i = 1; i < h-1; i++) {
+        for ( j = 1; j < w-1; j++) {
+            dst[i][j] = ky[0] * (buf[WRAPPED(i-1)][j] + buf[WRAPPED(i+1)][j]) +
+                       ky[1] * (buf[WRAPPED(i)][j-1] + buf[WRAPPED(i)][j+1]) +
+                       ky[2] * (buf[WRAPPED(i-1)][j-1] + buf[WRAPPED(i-1)][j+1] +
+                                buf[WRAPPED(i+1)][j-1] + buf[WRAPPED(i+1)][j+1]);
+        }
+    }
+}
+
+int main() {
+    float src[5][5] = {
+        {0, 0, 0, 0, 0},
+        {0, 1, 1, 1, 0},
+        {0, 1, 50, 1, 0},
+        {0, 1, 1, 1, 0},
+        {0, 0, 0, 0, 0}
+    };
+    float dst[5][5] = {0};
+    float kx[3] = {1/16, 2/16, 1/16};
+    float ky[3] = {1, 4, 1};
+
+    clock_t start = clock();
+
+    applySeparableGaussianBlur(src, dst, 5, 5, kx, ky);
+
+    clock_t end = clock();
+    double time_spent = (double)(end - start) / CLOCKS_PER_SEC;
+
+    printf("Result Matrix:\n");
+    int i,j;
+    for (i = 1; i < 4; i++) {
+        for (j = 1; j < 4; j++) {
+            printf("%.2f ", dst[i][j]);
+        }
+        printf("\n");
+    }
+    printf("Time spent: %lf seconds\n", time_spent);
+
+    return 0;
+}