banan-os/userspace/programs/WindowServer/main.cpp

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#include "WindowServer.h"
#include <BAN/Debug.h>
#include <BAN/ScopeGuard.h>
#include <LibGUI/Window.h>
#include <LibInput/KeyboardLayout.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/banan-os.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
struct Config
{
BAN::UniqPtr<LibImage::Image> background_image;
};
BAN::Optional<BAN::String> file_read_line(FILE* file)
{
BAN::String line;
char buffer[128];
while (fgets(buffer, sizeof(buffer), file))
{
MUST(line.append(buffer));
if (line.back() == '\n')
{
line.pop_back();
return BAN::move(line);
}
}
if (line.empty())
return {};
return BAN::move(line);
}
Config parse_config()
{
Config config;
auto home_env = getenv("HOME");
if (!home_env)
{
dprintln("HOME environment variable not set");
return config;
}
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auto config_path = MUST(BAN::String::formatted("{}/.config/WindowServer.conf", home_env));
FILE* fconfig = fopen(config_path.data(), "r");
if (!fconfig)
{
dprintln("Could not open '{}'", config_path);
return config;
}
BAN::ScopeGuard _([fconfig] { fclose(fconfig); });
while (true)
{
auto line = file_read_line(fconfig);
if (!line.has_value())
break;
if (line->empty())
continue;
auto parts = MUST(line->sv().split('='));
if (parts.size() != 2)
{
dwarnln("Invalid config line: {}", line.value());
break;
}
auto variable = parts[0];
auto value = parts[1];
if (variable == "bg"_sv)
{
auto image = LibImage::Image::load_from_file(value);
if (image.is_error())
dwarnln("Could not load image: {}", image.error());
else
config.background_image = image.release_value();
}
else
{
dwarnln("Unknown config variable: {}", variable);
break;
}
}
return config;
}
int open_server_fd()
{
struct stat st;
if (stat(LibGUI::s_window_server_socket.data(), &st) != -1)
unlink(LibGUI::s_window_server_socket.data());
int server_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (server_fd == -1)
{
perror("socket");
exit(1);
}
sockaddr_un server_addr;
server_addr.sun_family = AF_UNIX;
strcpy(server_addr.sun_path, LibGUI::s_window_server_socket.data());
if (bind(server_fd, (sockaddr*)&server_addr, sizeof(server_addr)) == -1)
{
perror("bind");
exit(1);
}
if (chmod("/tmp/resolver.sock", 0777) == -1)
{
perror("chmod");
exit(1);
}
if (listen(server_fd, SOMAXCONN) == -1)
{
perror("listen");
exit(1);
}
return server_fd;
}
int main()
{
srand(time(nullptr));
int server_fd = open_server_fd();
auto framebuffer = open_framebuffer();
if (framebuffer.bpp != 32)
{
dwarnln("Window server requires 32 bpp");
return 1;
}
if (tty_ctrl(STDIN_FILENO, TTY_CMD_UNSET, TTY_FLAG_ENABLE_INPUT) == -1)
{
perror("tty_ctrl");
exit(1);
}
atexit([]() { tty_ctrl(STDIN_FILENO, TTY_CMD_SET, TTY_FLAG_ENABLE_INPUT); });
MUST(LibInput::KeyboardLayout::initialize());
MUST(LibInput::KeyboardLayout::get().load_from_file("/usr/share/keymaps/us.keymap"_sv));
int keyboard_fd = open("/dev/input0", O_RDONLY);
if (keyboard_fd == -1)
perror("open");
int mouse_fd = open("/dev/input1", O_RDONLY);
if (mouse_fd == -1)
perror("open");
dprintln("Window server started");
size_t window_packet_sizes[LibGUI::WindowPacketType::COUNT] {};
window_packet_sizes[LibGUI::WindowPacketType::INVALID] = 0;
window_packet_sizes[LibGUI::WindowPacketType::CreateWindow] = sizeof(LibGUI::WindowCreatePacket);
window_packet_sizes[LibGUI::WindowPacketType::Invalidate] = sizeof(LibGUI::WindowInvalidatePacket);
static_assert(LibGUI::WindowPacketType::COUNT == 3);
auto config = parse_config();
WindowServer window_server(framebuffer);
if (config.background_image)
if (auto ret = window_server.set_background_image(BAN::move(config.background_image)); ret.is_error())
dwarnln("Could not set background image: {}", ret.error());
constexpr uint64_t sync_interval_us = 1'000'000 / 60;
timespec last_sync { .tv_sec = 0, .tv_nsec = 0 };
while (!window_server.is_stopped())
{
timespec current_ts;
clock_gettime(CLOCK_MONOTONIC, &current_ts);
uint64_t us_since_last_sync = (current_ts.tv_sec - last_sync.tv_sec) * 1'000'000 + (current_ts.tv_nsec - last_sync.tv_nsec) / 1000;
if (us_since_last_sync > sync_interval_us)
{
window_server.sync();
us_since_last_sync = 0;
last_sync = current_ts;
}
int max_fd = server_fd;
fd_set fds;
FD_ZERO(&fds);
FD_SET(server_fd, &fds);
if (keyboard_fd != -1)
{
FD_SET(keyboard_fd, &fds);
max_fd = BAN::Math::max(max_fd, keyboard_fd);
}
if (mouse_fd != -1)
{
FD_SET(mouse_fd, &fds);
max_fd = BAN::Math::max(max_fd, mouse_fd);
}
max_fd = BAN::Math::max(max_fd, window_server.get_client_fds(fds));
timeval select_timeout {
.tv_sec = 0,
.tv_usec = static_cast<long>(sync_interval_us - us_since_last_sync)
};
int nselect = select(max_fd + 1, &fds, nullptr, nullptr, &select_timeout);
if (nselect == 0)
continue;
if (nselect == -1)
{
dwarnln("select: {}", strerror(errno));
break;
}
if (FD_ISSET(server_fd, &fds))
{
int window_fd = accept(server_fd, nullptr, nullptr);
if (window_fd == -1)
{
dwarnln("accept: {}", strerror(errno));
continue;
}
window_server.add_client_fd(window_fd);
}
if (keyboard_fd != -1 && FD_ISSET(keyboard_fd, &fds))
{
LibInput::RawKeyEvent event;
if (read(keyboard_fd, &event, sizeof(event)) == -1)
{
perror("read");
continue;
}
window_server.on_key_event(LibInput::KeyboardLayout::get().key_event_from_raw(event));
}
if (mouse_fd != -1 && FD_ISSET(mouse_fd, &fds))
{
LibInput::MouseEvent event;
if (read(mouse_fd, &event, sizeof(event)) == -1)
{
perror("read");
continue;
}
switch (event.type)
{
case LibInput::MouseEventType::MouseButtonEvent:
window_server.on_mouse_button(event.button_event);
break;
case LibInput::MouseEventType::MouseMoveEvent:
window_server.on_mouse_move(event.move_event);
break;
case LibInput::MouseEventType::MouseScrollEvent:
window_server.on_mouse_scroll(event.scroll_event);
break;
}
}
window_server.for_each_client_fd(
[&](int fd) -> BAN::Iteration
{
if (!FD_ISSET(fd, &fds))
return BAN::Iteration::Continue;
LibGUI::WindowPacket packet;
ssize_t nrecv = recv(fd, &packet, sizeof(packet), 0);
if (nrecv < 0)
dwarnln("recv: {}", strerror(errno));
if (nrecv <= 0)
{
window_server.remove_client_fd(fd);
return BAN::Iteration::Continue;
}
if (packet.type == LibGUI::WindowPacketType::INVALID || packet.type >= LibGUI::WindowPacketType::COUNT)
dwarnln("Invalid WindowPacket (type {})", (int)packet.type);
if (static_cast<size_t>(nrecv) != window_packet_sizes[packet.type])
dwarnln("Invalid WindowPacket size (type {}, size {})", (int)packet.type, nrecv);
else
window_server.on_window_packet(fd, packet);
return BAN::Iteration::Continue;
}
);
}
}