From 121c681f3f50154ac667cd40c0f04e3b8613d3bc Mon Sep 17 00:00:00 2001
From: cc <cc@localhost>
Date: Wed, 20 Aug 2025 20:33:47 -0700
Subject: Add erosion functionality

Added in-place versions

Added closeup and fill functionality
---
 src/label_formats/label_format.rs | 111 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 110 insertions(+), 1 deletion(-)

diff --git a/src/label_formats/label_format.rs b/src/label_formats/label_format.rs
index 6407097..b2373f5 100644
--- a/src/label_formats/label_format.rs
+++ b/src/label_formats/label_format.rs
@@ -45,6 +45,11 @@ impl LabelFormat {
         }
     }
 
+    pub fn idilate(&mut self) {
+        let dilated = self.dilate();
+        self.buffer = dilated.buffer;
+    }
+
     pub fn dilate(&self) -> LabelFormat {
         let width = self.width;
         let height = self.height;
@@ -89,6 +94,84 @@ impl LabelFormat {
             height,
         }
     }
+
+    pub fn ierode(&mut self) {
+        let eroded = self.erode();
+        self.buffer = eroded.buffer;
+    }
+
+    pub fn erode(&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 {
+                    continue;
+                }
+                if let Some(color) = self.get_up(x,y) {
+                    if color == 0 {
+                        continue;
+                    }
+                }
+                if let Some(color) = self.get_right(x,y) {
+                    if color == 0 {
+                        continue;
+                    }
+                }
+                if let Some(color) = self.get_down(x,y) {
+                    if color == 0 {
+                        continue;
+                    }
+                }
+                if let Some(color) = self.get_left(x,y) {
+                    if color == 0 {
+                        continue;
+                    }
+                }
+                output_buffer[index] = current_color;
+            }
+        }
+        LabelFormat {
+            buffer: output_buffer,
+            width,
+            height,
+        }
+    }
+
+    pub fn icloseup(&mut self, n: usize) {
+        for _ in 0..n {
+            self.ierode();
+        }
+        for _ in 0..n {
+            self.idilate();
+        }
+    }
+
+    pub fn closeup(&self, n: usize) -> LabelFormat {
+        let mut x = self.erode();
+        x.icloseup(n-1);
+        x.idilate();
+        x
+    }
+
+    pub fn ifill(&mut self, n: usize) {
+        for _ in 0..n {
+            self.idilate();
+        }
+        for _ in 0..n {
+            self.ierode();
+        }
+    }
+
+    pub fn fill(&self, n: usize) -> LabelFormat {
+        let mut x = self.dilate();
+        x.icloseup(n-1);
+        x.ierode();
+        x
+    }
 }
 
 #[cfg(test)]
@@ -96,7 +179,7 @@ mod tests {
     use super::*;
 
     #[test]
-    fn dilation_test() {
+    fn label_morphology_test() {
         const DIM: usize = 6;
         let mut test_data = LabelFormat {
             buffer: vec![0u16; DIM*DIM],
@@ -106,9 +189,35 @@ mod tests {
 
         test_data.buffer[2+3*DIM] = 1;
         test_data.buffer[3+3*DIM] = 1;
+        test_data.buffer[4+3*DIM] = 2;
         test_data.display(true);
         println!();
         let dilated = test_data.dilate();
         dilated.display(true);
+        println!();
+        let restored = dilated.erode();
+        restored.display(true);
+    }
+
+    #[test]
+    fn mutable_morphology_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.buffer[4+3*DIM] = 2;
+        test_data.display(true);
+        println!();
+        test_data.idilate();
+        test_data.display(true);
+        println!();
+        test_data.ierode();
+        test_data.display(true);
+        println!();
     }
 }
-- 
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