chres.cpp

/*
 * Copyright (c) 2021, Nico Weber <thakis@chromium.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibCore/ArgsParser.h>
#include <LibGUI/Application.h>
#include <LibGUI/ConnectionToWindowServer.h>
#include <LibMain/Main.h>

ErrorOr<int> serenity_main(Main::Arguments arguments)
{
    int screen = 0;
    int width = -1;
    int height = -1;
    int scale = -1;

    Core::ArgsParser args_parser;
    args_parser.set_general_help("Change the screen resolution.");
    args_parser.add_option(screen, "Screen", "screen", 's', "screen");
    args_parser.add_positional_argument(width, "Width", "width");
    args_parser.add_positional_argument(height, "Height", "height");
    args_parser.add_positional_argument(scale, "Scale Factor", "scale", Core::ArgsParser::Required::No);
    args_parser.parse(arguments);

    // A Core::EventLoop is all we need, but ConnectionToWindowServer needs a full Application object.
    char* dummy_argv[] = { arguments.argv[0] };
    auto app = TRY(GUI::Application::try_create(1, dummy_argv));
    auto screen_layout = GUI::ConnectionToWindowServer::the().get_screen_layout();
    if (screen < 0 || (size_t)screen >= screen_layout.screens.size()) {
        warnln("invalid screen index: {}", screen);
        return 1;
    }
    auto& main_screen = screen_layout.screens[screen];
    main_screen.resolution = { width, height };
    if (scale != -1)
        main_screen.scale_factor = scale;
    auto set_result = GUI::ConnectionToWindowServer::the().set_screen_layout(screen_layout, true);
    if (!set_result.success()) {
        warnln("failed to set resolution: {}", set_result.error_msg());
        return 1;
    }

    return 0;
}