Move flood fill

Make it crate-available

1 files changed, 28 insertions, 0 deletions

diff --git a/src/label_formats/mod.rs b/src/label_formats/mod.rs
index 1e3e4ae..b48486a 100644
--- a/src/label_formats/mod.rs
+++ b/src/label_formats/mod.rs
@@ -3,3 +3,31 @@ mod label_format;
 
 pub use large_label_format::LargeLabelFormat;
 pub use label_format::LabelFormat;
+
+pub(crate) fn flood(source: &LargeLabelFormat, destination: &mut Vec<u16>, 
+    x: usize, y: usize,
+    from_color: u32, to_color: u16) {
+    let width = source.width;
+    let destination_color = destination[x + y * width];
+    if destination_color != 0 {
+        return;
+    }
+    let source_color = source.buffer[x + y * width];
+    if source_color != from_color {
+        return;
+    }
+    destination[x + y * width] = to_color;
+    if x > 0 {
+        flood(source, destination, x-1, y, from_color, to_color);
+    }
+    if (x+1) < width {
+        flood(source, destination, x+1, y, from_color, to_color);
+    }
+    if y > 0 {
+        flood(source, destination, x, y-1, from_color, to_color);
+    }
+    if (y+1) < source.height {
+        flood(source, destination, x, y+1, from_color, to_color);
+    }
+}
+