Android FloodFill Algorithm

[java]

public class FloodFill {
public void floodFill(Bitmap image, Point node, int targetColor,
int replacementColor) {
int width = image.getWidth();
int height = image.getHeight();
int target = targetColor;
int replacement = replacementColor;
if (target != replacement) {
Queue<Point> queue = new LinkedList<Point>();
do {

int x = node.x;
int y = node.y;
while (x > 0 && image.getPixel(x – 1, y) == target) {
x–;

}
boolean spanUp = false;
boolean spanDown = false;
while (x < width && image.getPixel(x, y) == target) {
image.setPixel(x, y, replacement);
if (!spanUp && y > 0
&& image.getPixel(x, y – 1) == target) {
queue.add(new Point(x, y – 1));
spanUp = true;
} else if (spanUp && y > 0
&& image.getPixel(x, y – 1) != target) {
spanUp = false;
}
if (!spanDown && y < height – 1
&& image.getPixel(x, y + 1) == target) {
queue.add(new Point(x, y + 1));
spanDown = true;
} else if (spanDown && y < height – 1
&& image.getPixel(x, y + 1) != target) {
spanDown = false;
}
x++;
}
} while ((node = queue.poll()) != null);
}
}
}

[/java]

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