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/*
* Copyright (c) 2020, Ben Jilks <benjyjilks@gmail.com>
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
* Copyright (c) 2022, Torsten Engelmann <engelTorsten@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "BrushTool.h"
#include "../ImageEditor.h"
#include "../Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Label.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ValueSlider.h>
#include <LibGfx/AntiAliasingPainter.h>
#include <LibGfx/Color.h>
#include <LibGfx/Rect.h>
namespace PixelPaint {
void BrushTool::set_size(int size)
{
if (size == m_size)
return;
m_size = size;
refresh_editor_cursor();
}
void BrushTool::on_mousedown(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
if (layer_event.button() != GUI::MouseButton::Primary && layer_event.button() != GUI::MouseButton::Secondary)
return;
// Shift+Click draws a line from the last position to current one.
if (layer_event.shift() && m_has_clicked) {
draw_line(layer->get_scratch_edited_bitmap(), color_for(layer_event), m_last_position, layer_event.position());
auto modified_rect = Gfx::IntRect::from_two_points(m_last_position, layer_event.position()).inflated(m_size * 2, m_size * 2);
layer->did_modify_bitmap(modified_rect);
m_last_position = layer_event.position();
return;
}
draw_point(layer->get_scratch_edited_bitmap(), color_for(layer_event), layer_event.position());
layer->did_modify_bitmap(Gfx::IntRect::centered_on(layer_event.position(), Gfx::IntSize { m_size * 2, m_size * 2 }));
m_last_position = layer_event.position();
m_has_clicked = true;
m_was_drawing = true;
}
void BrushTool::on_mousemove(Layer* layer, MouseEvent& event)
{
if (!layer)
return;
auto& layer_event = event.layer_event();
if (!(layer_event.buttons() & GUI::MouseButton::Primary || layer_event.buttons() & GUI::MouseButton::Secondary))
return;
draw_line(layer->get_scratch_edited_bitmap(), color_for(layer_event), m_last_position, layer_event.position());
auto modified_rect = Gfx::IntRect::from_two_points(m_last_position, layer_event.position()).inflated(m_size * 2, m_size * 2);
layer->did_modify_bitmap(modified_rect);
m_last_position = layer_event.position();
m_was_drawing = true;
}
void BrushTool::on_mouseup(Layer*, MouseEvent&)
{
if (m_was_drawing) {
m_editor->did_complete_action(tool_name());
m_was_drawing = false;
}
}
Color BrushTool::color_for(GUI::MouseEvent const& event)
{
return m_editor->color_for(event);
}
void BrushTool::draw_point(Gfx::Bitmap& bitmap, Gfx::Color color, Gfx::IntPoint point)
{
constexpr auto flow_scale = 10;
for (int y = point.y() - size(); y < point.y() + size(); y++) {
for (int x = point.x() - size(); x < point.x() + size(); x++) {
auto distance = point.distance_from({ x, y });
if (x < 0 || x >= bitmap.width() || y < 0 || y >= bitmap.height())
continue;
if (distance >= size())
continue;
auto falloff = get_falloff(distance) * flow_scale;
auto pixel_color = color;
pixel_color.set_alpha(AK::min(falloff * 255, 255));
bitmap.set_pixel(x, y, bitmap.get_pixel(x, y).blend(pixel_color));
}
}
}
void BrushTool::draw_line(Gfx::Bitmap& bitmap, Gfx::Color color, Gfx::IntPoint start, Gfx::IntPoint end)
{
int length_x = end.x() - start.x();
int length_y = end.y() - start.y();
float y_step = length_y == 0 ? 0 : (float)(length_y) / (float)(length_x);
if (y_step > abs(length_y))
y_step = abs(length_y);
if (y_step < -abs(length_y))
y_step = -abs(length_y);
if (y_step == 0 && start.x() == end.x())
return;
int start_x = start.x();
int end_x = end.x();
int start_y = start.y();
int end_y = end.y();
if (start_x > end_x) {
swap(start_x, end_x);
swap(start_y, end_y);
}
float y = start_y;
for (int x = start_x; x <= end_x; x++) {
int start_step_y = y;
int end_step_y = y + y_step;
if (start_step_y > end_step_y)
swap(start_step_y, end_step_y);
for (int i = start_step_y; i <= end_step_y; i++)
draw_point(bitmap, color, { x, i });
y += y_step;
}
}
GUI::Widget* BrushTool::get_properties_widget()
{
if (!m_properties_widget) {
m_properties_widget = GUI::Widget::construct();
m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
auto& size_container = m_properties_widget->add<GUI::Widget>();
size_container.set_fixed_height(20);
size_container.set_layout<GUI::HorizontalBoxLayout>();
auto& size_label = size_container.add<GUI::Label>("Size:");
size_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
size_label.set_fixed_size(80, 20);
auto& size_slider = size_container.add<GUI::ValueSlider>(Orientation::Horizontal, String::from_utf8_short_string("px"sv));
size_slider.set_range(1, 100);
size_slider.set_value(m_size);
size_slider.set_override_cursor(cursor());
size_slider.on_change = [&](int value) {
set_size(value);
// Update cursor to provide an instant preview for the selected size.
size_slider.set_override_cursor(cursor());
};
set_primary_slider(&size_slider);
auto& hardness_container = m_properties_widget->add<GUI::Widget>();
hardness_container.set_fixed_height(20);
hardness_container.set_layout<GUI::HorizontalBoxLayout>();
auto& hardness_label = hardness_container.add<GUI::Label>("Hardness:");
hardness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
hardness_label.set_fixed_size(80, 20);
auto& hardness_slider = hardness_container.add<GUI::ValueSlider>(Orientation::Horizontal, String::from_utf8_short_string("%"sv));
hardness_slider.set_range(1, 100);
hardness_slider.set_value(m_hardness);
hardness_slider.on_change = [&](int value) {
set_hardness(value);
};
set_secondary_slider(&hardness_slider);
}
return m_properties_widget.ptr();
}
NonnullRefPtr<Gfx::Bitmap> BrushTool::build_cursor()
{
m_scale_last_created_cursor = m_editor ? m_editor->scale() : 1;
auto scaled_size = size() * m_scale_last_created_cursor;
auto containing_box_size = 2 * scaled_size;
NonnullRefPtr<Gfx::Bitmap> new_cursor = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, Gfx::IntSize(containing_box_size, containing_box_size)).release_value_but_fixme_should_propagate_errors();
Gfx::Painter painter { new_cursor };
Gfx::AntiAliasingPainter aa_painter { painter };
painter.draw_line({ scaled_size - 5, scaled_size }, { scaled_size + 5, scaled_size }, Color::LightGray, 3);
painter.draw_line({ scaled_size, scaled_size - 5 }, { scaled_size, scaled_size + 5 }, Color::LightGray, 3);
painter.draw_line({ scaled_size - 5, scaled_size }, { scaled_size + 5, scaled_size }, Color::MidGray, 1);
painter.draw_line({ scaled_size, scaled_size - 5 }, { scaled_size, scaled_size + 5 }, Color::MidGray, 1);
aa_painter.draw_ellipse(Gfx::IntRect(0, 0, containing_box_size, containing_box_size), Color::LightGray, 1);
return new_cursor;
}
void BrushTool::refresh_editor_cursor()
{
m_cursor = build_cursor();
if (m_editor)
m_editor->update_tool_cursor();
}
}
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