banan-os/userspace/libraries/LibGUI/Window.cpp

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#include "LibGUI/Window.h"
#include <BAN/ScopeGuard.h>
#include <LibFont/Font.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/banan-os.h>
#include <sys/mman.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
namespace LibGUI
{
struct ReceivePacket
{
PacketType type;
BAN::Vector<uint8_t> data_with_type;
};
static BAN::ErrorOr<ReceivePacket> recv_packet(int socket)
{
uint32_t packet_size;
{
const ssize_t nrecv = recv(socket, &packet_size, sizeof(uint32_t), 0);
if (nrecv < 0)
return BAN::Error::from_errno(errno);
if (nrecv == 0)
return BAN::Error::from_errno(ECONNRESET);
}
if (packet_size < sizeof(uint32_t))
return BAN::Error::from_literal("invalid packet, does not fit packet id");
BAN::Vector<uint8_t> packet_data;
TRY(packet_data.resize(packet_size));
size_t total_recv = 0;
while (total_recv < packet_size)
{
const ssize_t nrecv = recv(socket, packet_data.data() + total_recv, packet_size - total_recv, 0);
if (nrecv < 0)
return BAN::Error::from_errno(errno);
if (nrecv == 0)
return BAN::Error::from_errno(ECONNRESET);
total_recv += nrecv;
}
return ReceivePacket {
*reinterpret_cast<PacketType*>(packet_data.data()),
packet_data
};
}
Window::~Window()
{
clear();
}
BAN::ErrorOr<BAN::UniqPtr<Window>> Window::create(uint32_t width, uint32_t height, BAN::StringView title)
{
int server_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (server_fd == -1)
return BAN::Error::from_errno(errno);
BAN::ScopeGuard server_closer([server_fd] { close(server_fd); });
if (fcntl(server_fd, F_SETFL, fcntl(server_fd, F_GETFL) | O_CLOEXEC) == -1)
return BAN::Error::from_errno(errno);
timespec start_time;
clock_gettime(CLOCK_MONOTONIC, &start_time);
for (;;)
{
sockaddr_un server_address;
server_address.sun_family = AF_UNIX;
strcpy(server_address.sun_path, s_window_server_socket.data());
if (connect(server_fd, (sockaddr*)&server_address, sizeof(server_address)) == 0)
break;
timespec current_time;
clock_gettime(CLOCK_MONOTONIC, &current_time);
time_t duration_s = (current_time.tv_sec - start_time.tv_sec) + (current_time.tv_nsec >= start_time.tv_nsec);
if (duration_s > 1)
return BAN::Error::from_errno(ETIMEDOUT);
timespec sleep_time;
sleep_time.tv_sec = 0;
sleep_time.tv_nsec = 1'000'000;
nanosleep(&sleep_time, nullptr);
}
WindowPacket::WindowCreate create_packet;
create_packet.width = width;
create_packet.height = height;
TRY(create_packet.title.append(title));
TRY(create_packet.send_serialized(server_fd));
const auto [response_type, response_data ] = TRY(recv_packet(server_fd));
if (response_type != PacketType::WindowCreateResponse)
return BAN::Error::from_literal("Server responded with invalid packet");
const auto create_response = TRY(WindowPacket::WindowCreateResponse::deserialize(response_data.span()));
void* framebuffer_addr = smo_map(create_response.smo_key);
if (framebuffer_addr == nullptr)
return BAN::Error::from_errno(errno);
width = create_response.width;
height = create_response.height;
BAN::Vector<uint32_t> framebuffer;
TRY(framebuffer.resize(width * height, 0xFFFFFFFF));
auto window = TRY(BAN::UniqPtr<Window>::create(
server_fd,
static_cast<uint32_t*>(framebuffer_addr),
BAN::move(framebuffer),
width,
height
));
server_closer.disable();
return window;
}
void Window::fill_rect(int32_t x, int32_t y, uint32_t width, uint32_t height, uint32_t color)
{
if (!clamp_to_framebuffer(x, y, width, height))
return;
for (uint32_t y_off = 0; y_off < height; y_off++)
for (uint32_t x_off = 0; x_off < width; x_off++)
set_pixel(x + x_off, y + y_off, color);
}
void Window::draw_character(uint32_t codepoint, const LibFont::Font& font, int32_t tl_x, int32_t tl_y, uint32_t color)
{
if (tl_y + (int32_t)font.height() < 0 || tl_y >= (int32_t)height())
return;
if (tl_x + (int32_t)font.width() < 0 || tl_x >= (int32_t)width())
return;
auto glyph = font.glyph(codepoint);
if (glyph == nullptr)
return;
for (int32_t off_y = 0; off_y < (int32_t)font.height(); off_y++)
{
if (tl_y + off_y < 0)
continue;
uint32_t abs_y = tl_y + off_y;
if (abs_y >= height())
break;
for (int32_t off_x = 0; off_x < (int32_t)font.width(); off_x++)
{
if (tl_x + off_x < 0)
continue;
uint32_t abs_x = tl_x + off_x;
if (abs_x >= width())
break;
const uint8_t bitmask = 1 << (font.width() - off_x - 1);
if (glyph[off_y * font.pitch()] & bitmask)
set_pixel(abs_x, abs_y, color);
}
}
}
void Window::draw_text(BAN::StringView text, const LibFont::Font& font, int32_t tl_x, int32_t tl_y, uint32_t color)
{
for (size_t i = 0; i < text.size(); i++)
draw_character(text[i], font, tl_x + (int32_t)(i * font.width()), tl_y, color);
}
void Window::shift_vertical(int32_t amount, uint32_t fill_color)
{
const uint32_t amount_abs = BAN::Math::abs(amount);
if (amount_abs == 0 || amount_abs >= height())
return;
uint32_t* dst = (amount > 0) ? m_framebuffer.data() + width() * amount_abs : m_framebuffer.data();
uint32_t* src = (amount < 0) ? m_framebuffer.data() + width() * amount_abs : m_framebuffer.data();
memmove(dst, src, width() * (height() - amount_abs) * 4);
const uint32_t y_lo = (amount < 0) ? height() - amount_abs : 0;
const uint32_t y_hi = (amount < 0) ? height() : amount_abs;
for (uint32_t y = y_lo; y < y_hi; y++)
for (uint32_t x = 0; x < width(); x++)
set_pixel(x, y, fill_color);
}
void Window::copy_horizontal_slice(int32_t dst_y, int32_t src_y, uint32_t uamount, uint32_t fill_color)
{
int32_t amount = uamount;
if (dst_y < 0)
{
amount -= -dst_y;
src_y += -dst_y;
dst_y = 0;
}
amount = BAN::Math::min<int32_t>(amount, height() - dst_y);
if (amount <= 0)
return;
const int32_t copy_src_y = BAN::Math::clamp<int32_t>(src_y, 0, height());
const int32_t copy_amount = BAN::Math::clamp<int32_t>(src_y + amount, 0, height()) - copy_src_y;
if (copy_amount > 0)
{
memmove(
&m_framebuffer[width() * (dst_y + (copy_src_y - src_y))],
&m_framebuffer[width() * copy_src_y],
copy_amount * width() * 4
);
}
const uint32_t fill_y_off = (src_y < copy_src_y) ? 0 : copy_amount;
const uint32_t fill_amount = amount - copy_amount;
for (uint32_t i = 0; i < fill_amount; i++)
for (uint32_t x = 0; x < width(); x++)
set_pixel(x, dst_y + fill_y_off + i, fill_color);
}
bool Window::clamp_to_framebuffer(int32_t& signed_x, int32_t& signed_y, uint32_t& width, uint32_t& height) const
{
int32_t min_x = BAN::Math::max<int32_t>(signed_x, 0);
int32_t min_y = BAN::Math::max<int32_t>(signed_y, 0);
int32_t max_x = BAN::Math::min<int32_t>(this->width(), signed_x + (int32_t)width);
int32_t max_y = BAN::Math::min<int32_t>(this->height(), signed_y + (int32_t)height);
if (min_x >= max_x)
return false;
if (min_y >= max_y)
return false;
signed_x = min_x;
signed_y = min_y;
width = max_x - min_x;
height = max_y - min_y;
return true;
}
void Window::invalidate(int32_t x, int32_t y, uint32_t width, uint32_t height)
{
if (!clamp_to_framebuffer(x, y, width, height))
return;
for (uint32_t i = 0; i < height; i++)
memcpy(&m_framebuffer_smo[(y + i) * m_width + x], &m_framebuffer[(y + i) * m_width + x], width * sizeof(uint32_t));
WindowPacket::WindowInvalidate packet;
packet.x = x;
packet.y = y;
packet.width = width;
packet.height = height;
if (auto ret = packet.send_serialized(m_server_fd); ret.is_error())
return on_socket_error(__FUNCTION__);
}
void Window::set_mouse_capture(bool captured)
{
WindowPacket::WindowSetMouseCapture packet;
packet.captured = captured;
if (auto ret = packet.send_serialized(m_server_fd); ret.is_error())
return on_socket_error(__FUNCTION__);
}
void Window::set_position(int32_t x, int32_t y)
{
WindowPacket::WindowSetPosition packet;
packet.x = x;
packet.y = y;
if (auto ret = packet.send_serialized(m_server_fd); ret.is_error())
return on_socket_error(__FUNCTION__);
}
void Window::set_attributes(Attributes attributes)
{
WindowPacket::WindowSetAttributes packet;
packet.attributes = attributes;
if (auto ret = packet.send_serialized(m_server_fd); ret.is_error())
return on_socket_error(__FUNCTION__);
m_attributes = attributes;
}
void Window::on_socket_error(BAN::StringView function)
{
if (m_handling_socket_error)
return;
m_handling_socket_error = true;
dprintln("Socket error while running Window::{}", function);
if (!m_socket_error_callback)
exit(1);
m_socket_error_callback();
clear();
}
void Window::clear()
{
munmap(m_framebuffer_smo, m_width * m_height * 4);
close(m_server_fd);
m_server_fd = -1;
}
#define TRY_OR_BREAK(...) ({ auto&& e = (__VA_ARGS__); if (e.is_error()) break; e.release_value(); })
void Window::poll_events()
{
for (;;)
{
fd_set fds;
FD_ZERO(&fds);
FD_SET(m_server_fd, &fds);
timeval timeout { .tv_sec = 0, .tv_usec = 0 };
select(m_server_fd + 1, &fds, nullptr, nullptr, &timeout);
if (!FD_ISSET(m_server_fd, &fds))
break;
auto packet_or_error = recv_packet(m_server_fd);
if (packet_or_error.is_error())
return on_socket_error(__FUNCTION__);
const auto [packet_type, packet_data] = packet_or_error.release_value();
switch (packet_type)
{
case PacketType::DestroyWindowEvent:
exit(1);
case PacketType::CloseWindowEvent:
if (m_close_window_event_callback)
m_close_window_event_callback();
else
exit(0);
break;
case PacketType::KeyEvent:
if (m_key_event_callback)
m_key_event_callback(TRY_OR_BREAK(EventPacket::KeyEvent::deserialize(packet_data.span())).event);
break;
case PacketType::MouseButtonEvent:
if (m_mouse_button_event_callback)
m_mouse_button_event_callback(TRY_OR_BREAK(EventPacket::MouseButtonEvent::deserialize(packet_data.span())).event);
break;
case PacketType::MouseMoveEvent:
if (m_mouse_move_event_callback)
m_mouse_move_event_callback(TRY_OR_BREAK(EventPacket::MouseMoveEvent::deserialize(packet_data.span())).event);
break;
case PacketType::MouseScrollEvent:
if (m_mouse_scroll_event_callback)
m_mouse_scroll_event_callback(TRY_OR_BREAK(EventPacket::MouseScrollEvent::deserialize(packet_data.span())).event);
break;
default:
break;
}
}
}
}