ladybird/Applications/PaintBrush/BucketTool.cpp

#include "BucketTool.h"
#include "PaintableWidget.h"
#include <AK/Queue.h>
#include <AK/SinglyLinkedList.h>
#include <LibGUI/GPainter.h>
#include <LibDraw/GraphicsBitmap.h>
#include <stdio.h>

BucketTool::BucketTool()
{
}

BucketTool::~BucketTool()
{
}

static void flood_fill(GraphicsBitmap& bitmap, const Point& start_position, Color target_color, Color fill_color)
{
    ASSERT(bitmap.bpp() == 32);

    if (target_color == fill_color)
        return;

    Queue<Point> queue;
    queue.enqueue(Point(start_position));
    while (!queue.is_empty()) {
        auto position = queue.dequeue();

        if (bitmap.get_pixel<GraphicsBitmap::Format::RGB32>(position.x(), position.y()) != target_color)
            continue;
        bitmap.set_pixel<GraphicsBitmap::Format::RGB32>(position.x(), position.y(), fill_color);

        if (position.x() != 0)
            queue.enqueue(position.translated(-1, 0));

        if (position.x() != bitmap.width() - 1)
            queue.enqueue(position.translated(1, 0));

        if (position.y() != 0)
            queue.enqueue(position.translated(0, -1));

        if (position.y() != bitmap.height() - 1)
            queue.enqueue(position.translated(0, 1));
    }
}

void BucketTool::on_mousedown(GMouseEvent& event)
{
    if (!m_widget->rect().contains(event.position()))
        return;

    GPainter painter(m_widget->bitmap());
    auto target_color = m_widget->bitmap().get_pixel(event.x(), event.y());

    flood_fill(m_widget->bitmap(), event.position(), target_color, m_widget->color_for(event));

    m_widget->update();
}