Data commit

Task/Bitmap-Flood-fill/D/bitmap-flood-fill.d

@@ -0,0 +1,29 @@
+import std.array, bitmap;
+
+void floodFill(Color)(Image!Color img, in uint x, in uint y,
+                      in Color color)
+/*pure*/ nothrow in {
+    assert (y < img.ny && x < img.nx);
+} body {
+    immutable target = img[x, y];
+    static struct Pos { uint x, y; }
+    auto stack = [Pos(x, y)];
+
+    while (!stack.empty) {
+        immutable p = stack.back;
+        stack.popBack;
+        if (p.y < img.ny && p.x < img.nx && img[p.x, p.y] == target) {
+            img[p.x, p.y] = color;
+            stack.assumeSafeAppend;
+            stack ~= [Pos(p.x,     p.y + 1), Pos(p.x,     p.y - 1),
+                      Pos(p.x + 1, p.y),     Pos(p.x - 1, p.y)];
+        }
+    }
+}
+
+void main() {
+    Image!RGB img;
+    loadPPM6(img, "unfilled_circ.ppm");
+    img.floodFill(200, 200, RGB(127, 0, 0));
+    img.savePPM6("unfilled_circ_flooded.ppm");
+}