made vertical_flip first try

src/main.c

@@ -212,7 +212,18 @@ horizontal_flip(unsigned int* buf, int size, int w) {
 
 unsigned int*
 vertical_flip(unsigned int* buf, int size, int w, int h) {
+	unsigned int* flip = malloc((w * h) * sizeof(unsigned int));
 
+	int idx = 0;
+	for(int i = h - 1; i >= 0; i--) {
+		for(int k = 0; k < w; k++) {
+			flip[idx] = buf[i * w + k];
+			idx++;
+		}
+	}
+	free(buf);
+
+	return flip;
 }
 
 
@@ -247,21 +258,22 @@ main()
 	// test = (test << 3) | (test >> (8 - 3));
 	// print_bits_int(test);
 
-	unsigned int color = encoder(200, 10, 50);
-	color = set_alpha(color, 100);
-	print_bits_int(color);
-	// unsigned int channelled_color = channel_mask(color, 'g');
-	color = chromatic_circular_shift(color, 3);
-	print_bits_int(color);
-	// int width, height;
-	// char magic_number[3];
-	// int max_val;
-	//
-	// unsigned int* buf =
-	//     ppm_encode("../test.ppm", &width, &height, &max_val,
-	//     magic_number);
+	// unsigned int color = encoder(200, 10, 50);
+	// color = set_alpha(color, 100);
+	// print_bits_int(color);
+	// // unsigned int channelled_color = channel_mask(color, 'g');
+	// color = chromatic_circular_shift(color, 3);
+	// print_bits_int(color);
+	int width, height;
+	char magic_number[3];
+	int max_val;
+
+	unsigned int* buf =
+	    ppm_encode("../test.ppm", &width, &height, &max_val,
+	    magic_number);
 	// ppm_apply_brightness(buf, (width * height), .5);
-	// ppm_decode(buf, (width * height), "../new.ppm", &width, &height);
-	// free(buf);
+	buf = vertical_flip(buf, (width * height), width,  height);
+	ppm_decode(buf, (width * height), "../new.ppm", &width, &height);
+	free(buf);
 	return 0;
 }