Add a pixel inversion program

make.sh

@@ -0,0 +1 @@
+gcc samples/resize_image.c sod.c -I./ -lm -o resver

samples/reverse.c

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+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "sod.h"
+
+#define MAX_IMG_SZ 1024*1024
+
+int main()
+{
+    unsigned char *zInpbuf = NULL;
+
+    zInpbuf = malloc(MAX_IMG_SZ);
+    if (!zInpbuf)
+    {
+        perror("malloc");
+        return -1;
+    }
+
+    ssize_t imgSz = read(0, zInpbuf, MAX_IMG_SZ);
+    if (imgSz <= 0)
+    {
+        perror("read");
+        free(zInpbuf);
+        return -1;
+    }
+
+	sod_img imgIn = sod_img_load_from_mem(zInpbuf, imgSz, SOD_IMG_COLOR /* full color channels */);
+	if (imgIn.data == 0) {
+		/* Invalid path, unsupported format, memory failure, etc. */
+		//puts("Cannot load input image..exiting");
+		printf("Error loading input\n");
+		free(zInpbuf);
+		return -1;
+	}
+
+   for (int i = 0; i < imgIn.w * imgIn.h * imgIn.c; i++)
+    {
+        imgIn.data[i] = 255.0f - imgIn.data[i];
+    }
+    sod_img_save_as_png(imgIn, NULL);
+    sod_free_image(imgIn);
+    free(zInpbuf);
+    return 0;
+}