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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
* Copyright (c) 2022, Timothy Slater <tslater2006@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "WandSelectTool.h"
#include "../ImageEditor.h"
#include "../Layer.h"
#include <AK/Queue.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Button.h>
#include <LibGUI/ComboBox.h>
#include <LibGUI/ItemListModel.h>
#include <LibGUI/Label.h>
#include <LibGUI/Model.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ValueSlider.h>
namespace PixelPaint {
static float color_distance_squared(Gfx::Color const& lhs, Gfx::Color const& rhs)
{
int a = rhs.red() - lhs.red();
int b = rhs.green() - lhs.green();
int c = rhs.blue() - lhs.blue();
int d = rhs.alpha() - lhs.alpha();
return (a * a + b * b + c * c + d * d) / (4.0f * 255.0f * 255.0f);
}
static bool meets_wand_threshold(Gfx::IntPoint point, Gfx::Bitmap& bitmap, Gfx::Color const& target_color, float threshold_normalized_squared)
{
auto pixel_color = bitmap.get_pixel<Gfx::StorageFormat::BGRA8888>(point.x(), point.y());
bool meets_threshold = color_distance_squared(pixel_color, target_color) <= threshold_normalized_squared;
return meets_threshold;
}
static void set_flood_selection(Gfx::Bitmap& bitmap, Image& image, Gfx::IntPoint const& start_position, Color target_color, int threshold, Selection::MergeMode merge_mode)
{
VERIFY(bitmap.bpp() == 32);
float threshold_normalized_squared = (threshold / 100.0f) * (threshold / 100.0f);
// Create Mask which will track already-colored pixels
Mask flood_mask = Mask::empty(bitmap.rect());
Mask selection_mask = Mask::empty(bitmap.rect());
Queue<Gfx::IntPoint> points_to_visit = Queue<Gfx::IntPoint>();
points_to_visit.enqueue({ start_position.x(), start_position.y() });
selection_mask.set(start_position.x(), start_position.y(), 0xFF);
flood_mask.set(start_position.x(), start_position.y(), 0xFF);
// This implements a non-recursive flood fill. This is a breadth-first search of paintable neighbors
// As we find neighbors that are paintable we update their pixel, add them to the queue, and mark them in the mask
while (!points_to_visit.is_empty()) {
auto current_point = points_to_visit.dequeue();
auto candidate_points = Array {
current_point.moved_left(1),
current_point.moved_right(1),
current_point.moved_up(1),
current_point.moved_down(1)
};
for (auto candidate_point : candidate_points) {
if (!bitmap.rect().contains(candidate_point))
continue;
if (flood_mask.get(candidate_point.x(), candidate_point.y()) == 0 && meets_wand_threshold(candidate_point, bitmap, target_color, threshold_normalized_squared)) {
points_to_visit.enqueue(candidate_point);
selection_mask.set(candidate_point.x(), candidate_point.y(), 0xFF);
}
flood_mask.set(candidate_point.x(), candidate_point.y(), 0xFF);
}
}
selection_mask.shrink_to_fit();
image.selection().merge(selection_mask, merge_mode);
}
void WandSelectTool::on_mousedown(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
if (!layer->rect().contains(layer_event.position()))
return;
auto target_color = layer->currently_edited_bitmap().get_pixel(layer_event.x(), layer_event.y());
m_editor->image().selection().begin_interactive_selection();
set_flood_selection(layer->currently_edited_bitmap(), m_editor->image(), layer_event.position(), target_color, m_threshold, m_merge_mode);
m_editor->image().selection().end_interactive_selection();
m_editor->update();
m_editor->did_complete_action(tool_name());
}
GUI::Widget* WandSelectTool::get_properties_widget()
{
if (m_properties_widget) {
return m_properties_widget.ptr();
}
m_properties_widget = GUI::Widget::construct();
m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
auto& threshold_container = m_properties_widget->add<GUI::Widget>();
threshold_container.set_fixed_height(20);
threshold_container.set_layout<GUI::HorizontalBoxLayout>();
auto& threshold_label = threshold_container.add<GUI::Label>("Threshold:");
threshold_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
threshold_label.set_fixed_size(80, 20);
auto& threshold_slider = threshold_container.add<GUI::ValueSlider>(Orientation::Horizontal, "%");
threshold_slider.set_range(0, 100);
threshold_slider.set_value(m_threshold);
threshold_slider.on_change = [&](int value) {
m_threshold = value;
};
set_primary_slider(&threshold_slider);
auto& mode_container = m_properties_widget->add<GUI::Widget>();
mode_container.set_fixed_height(20);
mode_container.set_layout<GUI::HorizontalBoxLayout>();
auto& mode_label = mode_container.add<GUI::Label>();
mode_label.set_text("Mode:");
mode_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
mode_label.set_fixed_size(80, 20);
for (int i = 0; i < (int)Selection::MergeMode::__Count; i++) {
switch ((Selection::MergeMode)i) {
case Selection::MergeMode::Set:
m_merge_mode_names.append("Set");
break;
case Selection::MergeMode::Add:
m_merge_mode_names.append("Add");
break;
case Selection::MergeMode::Subtract:
m_merge_mode_names.append("Subtract");
break;
case Selection::MergeMode::Intersect:
m_merge_mode_names.append("Intersect");
break;
default:
VERIFY_NOT_REACHED();
}
}
auto& mode_combo = mode_container.add<GUI::ComboBox>();
mode_combo.set_only_allow_values_from_model(true);
mode_combo.set_model(*GUI::ItemListModel<String>::create(m_merge_mode_names));
mode_combo.set_selected_index((int)m_merge_mode);
mode_combo.on_change = [this](auto&&, GUI::ModelIndex const& index) {
VERIFY(index.row() >= 0);
VERIFY(index.row() < (int)Selection::MergeMode::__Count);
m_merge_mode = (Selection::MergeMode)index.row();
};
return m_properties_widget.ptr();
}
}
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