3 files changed, 129 insertions, 19 deletions
diff --git a/src/label_formats/label_format.rs b/src/label_formats/label_format.rs
index 0f33932..6407097 100644
--- a/src/label_formats/label_format.rs
+++ b/src/label_formats/label_format.rs
@@ -3,3 +3,112 @@ pub struct LabelFormat {
     pub width: usize,
     pub height: usize,
 }
+
+impl LabelFormat {
+    pub fn get_left(&self, x: usize, y: usize) -> Option<u16> {
+        if x > 0 {
+            return Some(self.buffer[(x-1) + y * self.width]);
+        }
+        return None;
+    }
+
+    pub fn get_right(&self, x: usize, y: usize) -> Option<u16> {
+        if (x+1) < self.width {
+            return Some(self.buffer[(x+1) + y * self.width]);
+        }
+        return None;
+    }
+
+    pub fn get_up(&self, x: usize, y: usize) -> Option<u16> {
+        if y > 0 {
+            return Some(self.buffer[x + (y-1) * self.width]);
+        }
+        return None;
+    }
+
+    pub fn get_down(&self, x: usize, y: usize) -> Option<u16> {
+        if (y+1) < self.height {
+            return Some(self.buffer[x + (y+1) * self.width]);
+        }
+        return None;
+    }
+
+    pub fn display(&self, include_space: bool) {
+        for y in 0..self.height {
+            for x in 0..self.width {
+                print!("{:04X}", self.buffer[x + y*self.width]);
+                if include_space {
+                    print!(" ");
+                }
+            }
+            println!();
+        }
+    }
+
+    pub fn dilate(&self) -> LabelFormat {
+        let width = self.width;
+        let height = self.height;
+        let mut output_buffer = vec![0u16; width*height];
+        for y in 0..height {
+            for x in 0..width {
+                let index = x + y * width;
+                let current_color = self.buffer[index];
+                if current_color != 0 {
+                    output_buffer[index] = current_color;
+                    continue;
+                }
+                if let Some(color) = self.get_up(x,y) {
+                    if color != 0 {
+                        output_buffer[index] = color;
+                        continue;
+                    }
+                }
+                if let Some(color) = self.get_right(x,y) {
+                    if color != 0 {
+                        output_buffer[index] = color;
+                        continue;
+                    }
+                }
+                if let Some(color) = self.get_down(x,y) {
+                    if color != 0 {
+                        output_buffer[index] = color;
+                        continue;
+                    }
+                }
+                if let Some(color) = self.get_left(x,y) {
+                    if color != 0 {
+                        output_buffer[index] = color;
+                        continue;
+                    }
+                }
+            }
+        }
+        LabelFormat {
+            buffer: output_buffer,
+            width,
+            height,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn dilation_test() {
+        const DIM: usize = 6;
+        let mut test_data = LabelFormat {
+            buffer: vec![0u16; DIM*DIM],
+            width: DIM,
+            height: DIM,
+        };
+
+        test_data.buffer[2+3*DIM] = 1;
+        test_data.buffer[3+3*DIM] = 1;
+        test_data.display(true);
+        println!();
+        let dilated = test_data.dilate();
+        dilated.display(true);
+    }
+}
diff --git a/src/label_formats/large_label_format.rs b/src/label_formats/large_label_format.rs
index f717ac5..244c7d3 100644
--- a/src/label_formats/large_label_format.rs
+++ b/src/label_formats/large_label_format.rs
@@ -42,25 +42,27 @@ fn flood(source: &LargeLabelFormat, destination: &mut Vec<u16>,
     }
 }
 
-pub fn compress_large_labels(largelabels: LargeLabelFormat) -> LabelFormat {
-    let mut label: u16 = 1;
-    let mut output_buffer: Vec<u16> = vec![0u16; largelabels.buffer.len()];
-    for y in 0..largelabels.height {
-        for x in 0..largelabels.width {
-            let index = x + y*largelabels.width;
-            if largelabels.buffer[index] == 0 {
-                continue;
-            }
-            if output_buffer[index] == 0 {
-                let color = largelabels.buffer[index];
-                flood(&largelabels, &mut output_buffer, x, y, color, label);
-                label += 1;
+impl LargeLabelFormat {
+    pub fn compress(&self) -> LabelFormat {
+        let mut label: u16 = 1;
+        let mut output_buffer: Vec<u16> = vec![0u16; self.buffer.len()];
+        for y in 0..self.height {
+            for x in 0..self.width {
+                let index = x + y*self.width;
+                if self.buffer[index] == 0 {
+                    continue;
+                }
+                if output_buffer[index] == 0 {
+                    let color = self.buffer[index];
+                    flood(&self, &mut output_buffer, x, y, color, label);
+                    label += 1;
+                }
             }
         }
+        return LabelFormat {
+            buffer: output_buffer,
+            width: self.width,
+            height: self.height,
+        };
     }
-    return LabelFormat {
-        buffer: output_buffer,
-        width: largelabels.width,
-        height: largelabels.height,
-    };
 }
diff --git a/src/label_formats/mod.rs b/src/label_formats/mod.rs
index 7386df8..1e3e4ae 100644
--- a/src/label_formats/mod.rs
+++ b/src/label_formats/mod.rs
@@ -2,5 +2,4 @@ mod large_label_format;
 mod label_format;
 
 pub use large_label_format::LargeLabelFormat;
-pub use large_label_format::compress_large_labels;
 pub use label_format::LabelFormat;