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/*
* Copyright (c) 2022, Torsten Engelmann <engelTorsten@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "LevelsDialog.h"
#include <Applications/PixelPaint/LevelsDialogGML.h>
#include <LibGUI/Button.h>
#include <LibGUI/Label.h>
#include <LibGUI/ValueSlider.h>
namespace PixelPaint {
LevelsDialog::LevelsDialog(GUI::Window* parent_window, ImageEditor* editor)
: GUI::Dialog(parent_window)
{
set_title("Levels");
set_icon(parent_window->icon());
auto main_widget = set_main_widget<GUI::Widget>().release_value_but_fixme_should_propagate_errors();
main_widget->load_from_gml(levels_dialog_gml).release_value_but_fixme_should_propagate_errors();
resize(305, 202);
set_resizable(false);
m_editor = editor;
m_brightness_slider = main_widget->find_descendant_of_type_named<GUI::ValueSlider>("brightness_slider");
m_contrast_slider = main_widget->find_descendant_of_type_named<GUI::ValueSlider>("contrast_slider");
m_gamma_slider = main_widget->find_descendant_of_type_named<GUI::ValueSlider>("gamma_slider");
auto context_label = main_widget->find_descendant_of_type_named<GUI::Label>("context_label");
auto apply_button = main_widget->find_descendant_of_type_named<GUI::Button>("apply_button");
auto cancel_button = main_widget->find_descendant_of_type_named<GUI::Button>("cancel_button");
VERIFY(m_brightness_slider);
VERIFY(m_contrast_slider);
VERIFY(m_gamma_slider);
VERIFY(context_label);
VERIFY(apply_button);
VERIFY(cancel_button);
VERIFY(m_editor->active_layer());
context_label->set_text(String::formatted("Working on layer: {}", m_editor->active_layer()->name()).release_value_but_fixme_should_propagate_errors());
m_gamma_slider->set_value(100);
m_brightness_slider->on_change = [this](auto) {
generate_new_image();
};
m_contrast_slider->on_change = [this](auto) {
generate_new_image();
};
m_gamma_slider->on_change = [this](auto) {
generate_new_image();
};
apply_button->on_click = [this](auto) {
if (m_did_change)
m_editor->did_complete_action("Levels"sv);
cleanup_resources();
done(ExecResult::OK);
};
cancel_button->on_click = [this](auto) {
done(ExecResult::Cancel);
};
}
void LevelsDialog::revert_possible_changes()
{
// FIXME: Find a faster way to revert all the changes that we have done.
if (m_did_change && m_reference_bitmap) {
for (int x = 0; x < m_reference_bitmap->width(); x++) {
for (int y = 0; y < m_reference_bitmap->height(); y++) {
m_editor->active_layer()->content_bitmap().set_pixel(x, y, m_reference_bitmap->get_pixel(x, y));
}
}
m_editor->layers_did_change();
}
cleanup_resources();
}
void LevelsDialog::generate_new_image()
{
(void)ensure_reference_bitmap();
if (m_reference_bitmap.is_null())
return;
generate_precomputed_color_correction();
Color current_pixel_color;
Color new_pixel_color;
Gfx::StorageFormat storage_format = Gfx::determine_storage_format(m_editor->active_layer()->content_bitmap().format());
for (int x = 0; x < m_reference_bitmap->width(); x++) {
for (int y = 0; y < m_reference_bitmap->height(); y++) {
current_pixel_color = m_reference_bitmap->get_pixel(x, y);
new_pixel_color.set_alpha(current_pixel_color.alpha());
new_pixel_color.set_red(m_precomputed_color_correction[current_pixel_color.red()]);
new_pixel_color.set_green(m_precomputed_color_correction[current_pixel_color.green()]);
new_pixel_color.set_blue(m_precomputed_color_correction[current_pixel_color.blue()]);
switch (storage_format) {
case Gfx::StorageFormat::BGRx8888:
case Gfx::StorageFormat::BGRA8888:
m_editor->active_layer()->content_bitmap().scanline(y)[x] = new_pixel_color.value();
break;
default:
m_editor->active_layer()->content_bitmap().set_pixel(x, y, new_pixel_color);
}
}
}
m_editor->active_layer()->did_modify_bitmap();
m_did_change = true;
}
ErrorOr<void> LevelsDialog::ensure_reference_bitmap()
{
if (m_reference_bitmap.is_null())
m_reference_bitmap = TRY(m_editor->active_layer()->content_bitmap().clone());
return {};
}
void LevelsDialog::cleanup_resources()
{
if (m_reference_bitmap)
m_reference_bitmap = nullptr;
}
void LevelsDialog::generate_precomputed_color_correction()
{
int delta_brightness = m_brightness_slider->value();
float contrast_correction_factor = static_cast<float>(259 * (m_contrast_slider->value() + 255) / static_cast<float>(255 * (259 - m_contrast_slider->value())));
float gamma_correction = 1 / (m_gamma_slider->value() / 100.0);
for (int color_val = 0; color_val < 256; color_val++) {
m_precomputed_color_correction[color_val] = color_val + delta_brightness;
m_precomputed_color_correction[color_val] = m_precomputed_color_correction[color_val] < 0 ? 0 : m_precomputed_color_correction[color_val];
m_precomputed_color_correction[color_val] = m_precomputed_color_correction[color_val] > 255 ? 255 : m_precomputed_color_correction[color_val];
m_precomputed_color_correction[color_val] = 255 * AK::pow<float>((m_precomputed_color_correction[color_val] / 255.0), gamma_correction);
m_precomputed_color_correction[color_val] = contrast_correction_factor * (m_precomputed_color_correction[color_val] - 128) + 128;
m_precomputed_color_correction[color_val] = m_precomputed_color_correction[color_val] < 0 ? 0 : m_precomputed_color_correction[color_val];
m_precomputed_color_correction[color_val] = m_precomputed_color_correction[color_val] > 255 ? 255 : m_precomputed_color_correction[color_val];
}
}
}
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