how to fill color in image in particular area?

Question

I want to fill the color in white area for Paint based application so please give me suggestion for how to do this work..

Answer 1

after lot of searching, i came up with the following. It is fast and efficient

private void myFloodFillMethod(Point node,int targetColor, int fillColor) {
    if (targetColor != fillColor) {
        Queue queue = new LinkedList<>();
        do {
            int x = node.x;
            int y = node.y;

            while (x > 0 && getPixelColorFromArr(x - 1, y) == targetColor) {
                x--;                }
            boolean spanUp = false;
            boolean spanDown = false;

            while (x < width && checkEquality(getPixelColorFromArr(x, y),targetColor)) {
                setPixelColorFromArr(x, y, fillColor);
                if (!spanUp && y > 0
                        && checkEquality(getPixelColorFromArr(x, y - 1),targetColor)) {
                    queue.add(new Point(x, y - 1));
                    spanUp = true;
                } else if (spanUp && y > 0
                        && !checkEquality(getPixelColorFromArr(x, y - 1),targetColor)) {
                    spanUp = false;
                }
                if (!spanDown && y < height - 1
                        && checkEquality(getPixelColorFromArr(x, y + 1), targetColor)) {
                    queue.add(new Point(x, y + 1));
                    spanDown = true;
                } else if (spanDown && y < height - 1
                        && !checkEquality(getPixelColorFromArr(x, y + 1),targetColor)) {
                    spanDown = false;
                }
                x++;
            }

        } while ((node = queue.poll()) != null);
    }

}

private boolean checkEquality(int pixelColorFromArr, int targetColor) {
    return pixelColorFromArr == targetColor;
}

void fillColorInImage(Bitmap image, Point node, int targetColor, int replacementColor){

    if(targetColor ==  replacementColor) return;

    width = image.getWidth();
    height = image.getHeight();

    pixelArr = new int[width*height];

    image.getPixels(pixelArr,0,width,0,0,width,height);
    myFloodFillMethod(node,targetColor,replacementColor);

    image.setPixels(pixelArr,0,width,0,0,width,height);

}

how to call:

fillColorInImage(bmp, point, targetColor, replacementColor);

where

bmp is the bitmap of image(extract form the image view)

point is Point(x,y) where user has tapped:get it from event.getX() and event.getY()

targetColor is the color of the point: get it from bitmap.getPixel()

replacementColor is the color you want to replace it to