1 files changed, 90 insertions, 0 deletions
diff --git a/src/label_format.rs b/src/label_format.rs
index afbb2ad..1762445 100644
--- a/src/label_format.rs
+++ b/src/label_format.rs
@@ -1,3 +1,5 @@
+use crate::flood_u16;
+
 pub struct LabelFormat {
     pub buffer: Vec<u16>,
     pub width: usize,
@@ -176,6 +178,54 @@ impl LabelFormat {
     pub fn dump(&self, filename: &str) -> Result<(), std::io::Error> {
         crate::binfile::dump_u16_vec(filename, self.buffer.clone())
     }
+
+    pub fn combine(&self, other: &LabelFormat) -> Option<LabelFormat> {
+        let width = self.width;
+        let height = self.height;
+        let rwidth = other.width;
+        let rheight = other.height;
+        if (width != rwidth) || (height != rheight) {
+            return None;
+        }
+        let mut output = LabelFormat {
+            buffer: vec![0u16; width * height],
+            width,
+            height,
+        };
+        for y in 0..height {
+            for x in 0..width {
+                let index = x + y * width;
+                output.buffer[index] = self.buffer[index];
+                if output.buffer[index] == 0 {
+                    output.buffer[index] = other.buffer[index];
+                }
+            }
+        }
+        return Some(output);
+    }
+
+    pub fn refresh(&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_u16(self, &mut output_buffer, x, y, color, label);
+                    label += 1;
+                }
+            }
+        }
+        return LabelFormat {
+            buffer: output_buffer,
+            width: self.width,
+            height: self.height,
+        };
+    }
 }
 
 #[cfg(test)]
@@ -224,4 +274,44 @@ mod tests {
         test_data.display(true);
         println!();
     }
+
+    #[test]
+    fn combination_test() {
+        const DIM: usize = 6;
+        let mut test_data_1 = LabelFormat {
+            buffer: vec![0u16; DIM*DIM],
+            width: DIM,
+            height: DIM,
+        };
+
+        test_data_1.buffer[2+3*DIM] = 1;
+        test_data_1.buffer[3+3*DIM] = 1;
+        test_data_1.buffer[4+3*DIM] = 2;
+        test_data_1.display(true);
+        println!();
+
+        let mut test_data_2 = LabelFormat {
+            buffer: vec![0u16; DIM*DIM],
+            width: DIM,
+            height: DIM,
+        };
+
+        test_data_2.buffer[2+1*DIM] = 2;
+        test_data_2.buffer[3+1*DIM] = 2;
+        test_data_2.buffer[3+2*DIM] = 2;
+        test_data_2.buffer[4+1*DIM] = 3;
+        test_data_2.display(true);
+        println!();
+
+        if let Some(out_data) = test_data_1.combine(&test_data_2) {
+            out_data.display(true);
+            println!();
+
+            let refreshed = out_data.refresh();
+            refreshed.display(true);
+            println!();
+        } else {
+            assert!(false);
+        }
+    }
 }