4 files changed, 135 insertions, 0 deletions
diff --git a/src/lib/algo/flood_fill.c b/src/lib/algo/flood_fill.c
new file mode 100644
index 0000000..91f94ad
--- /dev/null
+++ b/src/lib/algo/flood_fill.c
@@ -0,0 +1,34 @@
+#include <lib/algo/flood_fill.h>
+
+//-----------------------------------------------
+// Flood
+// Floods a mask from a given set of image to determine the contiguous regions
+//  1. Check that the (x,y) is within the picture
+//  2. Check if the (x,y) coordinate in the mask is unused
+//  3. Check if the (x,y) coordinate in the image is non-background
+//  4. Check if the (x,y) coordinate in the image is the same color as the fill color
+//  5. If all hold, set the label for the pixel, and check each neighbor
+//     Otherwise, stop flooding
+bool_t flood(uint8_t* image, uint16_t* mask, size_t width, size_t height, size_t channels, size_t x, size_t y, uint8_t* fill_color, uint16_t label)
+{
+  if ((x >= width) | (y >= height)) {
+    return FALSE;
+  }
+  size_t coord = x + y*width;
+  if (mask[coord] != 0) {
+    return FALSE;
+  }
+  if (color_zero(&(image[coord*channels]), channels)) {
+    return FALSE;
+  }
+  if (color_equal(&(image[coord*channels]), fill_color, channels)) {
+    mask[coord] = label;
+    flood(image, mask, width, height, channels, x, y+1, fill_color, label);
+    flood(image, mask, width, height, channels, x, y-1, fill_color, label);
+    flood(image, mask, width, height, channels, x+1, y, fill_color, label);
+    flood(image, mask, width, height, channels, x-1, y, fill_color, label);
+    return TRUE;
+  }
+  return FALSE;
+}
+
diff --git a/src/lib/color.c b/src/lib/color.c
new file mode 100644
index 0000000..035a3e9
--- /dev/null
+++ b/src/lib/color.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <lib/color.h>
+#include <lib/bool.h>
+
+//-----------------------------------------------
+// Color Equal to Background
+// Background: zeros in RGB, alpha can be whatever
+bool_t color_zero(uint8_t* color1, size_t channels) {
+  for (size_t idx = 0; idx < channels; idx++) {
+    if (idx == 3) {
+      break;
+    }
+    if (color1[idx] != 0) {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+
+//-----------------------------------------------
+// Color Equality
+// Determine if two colors are identical
+bool_t color_equal(uint8_t* color1, uint8_t* color2, size_t channels) {
+  for (size_t idx = 0; idx < channels; idx++) {
+    if (color1[idx] != color2[idx]) {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+
+//-----------------------------------------------
+// Print out the `channels` length color vector
+void print_color(uint8_t* color, size_t channels) {
+  for (size_t index = 0; index < channels; index++) {
+    printf("%hhu ", color[index]);
+  }
+  printf("\n");
+}
diff --git a/src/lib/dir.c b/src/lib/dir.c
new file mode 100644
index 0000000..150d5bf
--- /dev/null
+++ b/src/lib/dir.c
@@ -0,0 +1,49 @@
+#include <lib/dir.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <stdlib.h>
+
+//-----------------------------------------------
+// Is directory
+bool_t is_directory(char* dirname) {
+  struct stat st;
+  if (stat(dirname, &st) == 0) {
+    if (S_ISDIR(st.st_mode)) {
+      return TRUE;
+    }
+  }
+  return FALSE;
+}
+
+//-----------------------------------------------
+// List directory
+char** lsdir(char* dirname) {
+  DIR *d;
+  struct dirent *dir;
+  d = opendir(dirname);
+  char** file_names = (char**)malloc(sizeof(char*));
+  if (!file_names) {
+    return NULL;
+  }
+  file_names[0] = NULL;
+  size_t file_count = 0;
+  if (d) {
+    while ((dir = readdir(d)) != NULL) {
+      if (dir->d_type == DT_REG) {
+	// When a regular file is reached
+	/// Create space for it in the list
+	file_names = realloc(file_names, (file_count+1+1)*sizeof(char*));
+	/// Create space for the name
+	file_names[file_count] = calloc(strlen(dir->d_name)+1, sizeof(char));
+	/// Copy the name
+	strcpy(file_names[file_count], dir->d_name);
+	/// Mark the end of the file list with a NULL entry
+	file_names[++file_count] = NULL;
+      }
+    }
+    return file_names;
+  }
+  return NULL;
+}
+
diff --git a/src/lib/time.c b/src/lib/time.c
new file mode 100644
index 0000000..2e5777b
--- /dev/null
+++ b/src/lib/time.c
@@ -0,0 +1,13 @@
+#include <lib/time.h>
+
+//-----------------------------------------------
+// Difference in Time
+// Compute the difference between timespec structs
+double diff_time(struct timespec *time1, struct timespec *time0) {
+  return (time1->tv_sec - time0->tv_sec)
+      + (time1->tv_nsec - time0->tv_nsec) / 1000000000.0;
+}
+
+void get_time(struct timespec *ts) {
+  timespec_get(ts, TIME_UTC);
+}