banan-os/userspace/WindowServer/WindowServer.cpp

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#include "Cursor.h"
#include "WindowServer.h"
#include <BAN/Debug.h>
#include <LibGUI/Window.h>
#include <LibInput/KeyboardLayout.h>
#include <stdlib.h>
#include <sys/banan-os.h>
#include <sys/mman.h>
#include <sys/socket.h>
WindowServer::WindowServer(Framebuffer& framebuffer)
: m_framebuffer(framebuffer)
, m_cursor({ framebuffer.width / 2, framebuffer.height / 2 })
, m_font(MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv)))
{
MUST(m_pages_to_sync_bitmap.resize(BAN::Math::div_round_up<size_t>(m_framebuffer.width * m_framebuffer.height * sizeof(uint32_t), 4096 * 8), 0));
invalidate(m_framebuffer.area());
}
BAN::ErrorOr<void> WindowServer::set_background_image(BAN::UniqPtr<LibImage::Image> image)
{
if (image->width() != (uint64_t)m_framebuffer.width || image->height() != (uint64_t)m_framebuffer.height)
image = TRY(image->resize(m_framebuffer.width, m_framebuffer.height));
m_background_image = BAN::move(image);
invalidate(m_framebuffer.area());
return {};
}
void WindowServer::on_window_packet(int fd, LibGUI::WindowPacket packet)
{
switch (packet.type)
{
case LibGUI::WindowPacketType::CreateWindow:
{
// FIXME: This should be probably allowed
for (auto& window : m_client_windows)
{
if (window->client_fd() == fd)
{
dwarnln("client {} tried to create window while already owning a window", fd);
return;
}
}
const size_t window_fb_bytes = packet.create.width * packet.create.height * 4;
long smo_key = smo_create(window_fb_bytes, PROT_READ | PROT_WRITE);
if (smo_key == -1)
{
dwarnln("smo_create: {}", strerror(errno));
break;
}
Rectangle window_area {
static_cast<int32_t>((m_framebuffer.width - packet.create.width) / 2),
static_cast<int32_t>((m_framebuffer.height - packet.create.height) / 2),
static_cast<int32_t>(packet.create.width),
static_cast<int32_t>(packet.create.height)
};
packet.create.title[sizeof(packet.create.title) - 1] = '\0';
// Window::Window(int fd, Rectangle area, long smo_key, BAN::StringView title, const LibFont::Font& font)
auto window = MUST(BAN::RefPtr<Window>::create(
fd,
window_area,
smo_key,
packet.create.title,
m_font
));
MUST(m_client_windows.push_back(window));
set_focused_window(window);
LibGUI::WindowCreateResponse response;
response.framebuffer_smo_key = smo_key;
if (send(window->client_fd(), &response, sizeof(response), 0) != sizeof(response))
{
dwarnln("send: {}", strerror(errno));
break;
}
break;
}
case LibGUI::WindowPacketType::Invalidate:
{
if (packet.invalidate.width == 0 || packet.invalidate.height == 0)
break;
BAN::RefPtr<Window> target_window;
for (auto& window : m_client_windows)
{
if (window->client_fd() == fd)
{
target_window = window;
break;
}
}
if (!target_window)
{
dwarnln("client {} tried to invalidate window while not owning a window", fd);
break;
}
const int32_t br_x = packet.invalidate.x + packet.invalidate.width - 1;
const int32_t br_y = packet.invalidate.y + packet.invalidate.height - 1;
if (!target_window->client_size().contains({ br_x, br_y }))
{
dwarnln("Invalid Invalidate packet parameters");
break;
}
invalidate({
target_window->client_x() + static_cast<int32_t>(packet.invalidate.x),
target_window->client_y() + static_cast<int32_t>(packet.invalidate.y),
static_cast<int32_t>(packet.invalidate.width),
static_cast<int32_t>(packet.invalidate.height),
});
break;
}
default:
ASSERT_NOT_REACHED();
}
}
void WindowServer::on_key_event(LibInput::KeyEvent event)
{
// Mod key is not passed to clients
if (event.key == LibInput::Key::Super)
{
m_is_mod_key_held = event.pressed();
return;
}
// Quick hack to stop the window server
if (event.pressed() && event.key == LibInput::Key::Escape)
{
m_is_stopped = true;
return;
}
// Kill window with mod+Q
if (m_is_mod_key_held && event.pressed() && event.key == LibInput::Key::Q)
{
if (m_focused_window)
remove_client_fd(m_focused_window->client_fd());
return;
}
if (m_focused_window)
{
LibGUI::EventPacket packet;
packet.type = LibGUI::EventPacket::Type::KeyEvent;
packet.key_event = event;
send(m_focused_window->client_fd(), &packet, sizeof(packet), 0);
}
}
void WindowServer::on_mouse_button(LibInput::MouseButtonEvent event)
{
BAN::RefPtr<Window> target_window;
for (size_t i = m_client_windows.size(); i > 0; i--)
{
if (m_client_windows[i - 1]->full_area().contains(m_cursor))
{
target_window = m_client_windows[i - 1];
break;
}
}
// Ignore mouse button events which are not on top of a window
if (!target_window)
return;
set_focused_window(target_window);
// Handle window moving when mod key is held or mouse press on title bar
const bool can_start_move = m_is_mod_key_held || target_window->title_text_area().contains(m_cursor);
if (event.pressed && event.button == LibInput::MouseButton::Left && !m_is_moving_window && can_start_move)
m_is_moving_window = true;
else if (m_is_moving_window && !event.pressed)
m_is_moving_window = false;
else if (!event.pressed && event.button == LibInput::MouseButton::Left && target_window->close_button_area().contains(m_cursor))
{
// NOTE: we always have target window if code reaches here
LibGUI::EventPacket packet;
packet.type = LibGUI::EventPacket::Type::CloseWindow;
send(m_focused_window->client_fd(), &packet, sizeof(packet), 0);
}
else if (target_window->client_area().contains(m_cursor))
{
// NOTE: we always have target window if code reaches here
LibGUI::EventPacket packet;
packet.type = LibGUI::EventPacket::Type::MouseButtonEvent;
packet.mouse_button_event.button = event.button;
packet.mouse_button_event.pressed = event.pressed;
packet.mouse_button_event.x = m_cursor.x - m_focused_window->client_x();
packet.mouse_button_event.y = m_cursor.y - m_focused_window->client_y();
send(m_focused_window->client_fd(), &packet, sizeof(packet), 0);
}
}
void WindowServer::on_mouse_move(LibInput::MouseMoveEvent event)
{
const int32_t new_x = BAN::Math::clamp(m_cursor.x + event.rel_x, 0, m_framebuffer.width);
const int32_t new_y = BAN::Math::clamp(m_cursor.y - event.rel_y, 0, m_framebuffer.height);
event.rel_x = new_x - m_cursor.x;
event.rel_y = new_y - m_cursor.y;
if (event.rel_x == 0 && event.rel_y == 0)
return;
auto old_cursor = cursor_area();
m_cursor.x = new_x;
m_cursor.y = new_y;
auto new_cursor = cursor_area();
invalidate(old_cursor);
invalidate(new_cursor);
// TODO: Really no need to loop over every window
for (auto& window : m_client_windows)
{
auto title_bar = window->title_bar_area();
if (title_bar.get_overlap(old_cursor).has_value() || title_bar.get_overlap(new_cursor).has_value())
invalidate(title_bar);
}
if (m_is_moving_window)
{
auto old_window = m_focused_window->full_area();
m_focused_window->set_position({
m_focused_window->client_x() + event.rel_x,
m_focused_window->client_y() + event.rel_y,
});
auto new_window = m_focused_window->full_area();
invalidate(old_window);
invalidate(new_window);
return;
}
if (m_focused_window)
{
LibGUI::EventPacket packet;
packet.type = LibGUI::EventPacket::Type::MouseMoveEvent;
packet.mouse_move_event.x = m_cursor.x - m_focused_window->client_x();
packet.mouse_move_event.y = m_cursor.y - m_focused_window->client_y();
send(m_focused_window->client_fd(), &packet, sizeof(packet), 0);
}
}
void WindowServer::on_mouse_scroll(LibInput::MouseScrollEvent event)
{
if (m_focused_window)
{
LibGUI::EventPacket packet;
packet.type = LibGUI::EventPacket::Type::MouseScrollEvent;
packet.mouse_scroll_event = event;
send(m_focused_window->client_fd(), &packet, sizeof(packet), 0);
}
}
void WindowServer::set_focused_window(BAN::RefPtr<Window> window)
{
if (m_focused_window == window)
return;
for (size_t i = m_client_windows.size(); i > 0; i--)
{
if (m_client_windows[i - 1] == window)
{
m_focused_window = window;
m_client_windows.remove(i - 1);
MUST(m_client_windows.push_back(window));
invalidate(window->full_area());
break;
}
}
}
void WindowServer::invalidate(Rectangle area)
{
auto fb_overlap = area.get_overlap(m_framebuffer.area());
if (!fb_overlap.has_value())
return;
area = fb_overlap.release_value();
if (m_background_image)
{
ASSERT(m_background_image->width() == (uint64_t)m_framebuffer.width);
ASSERT(m_background_image->height() == (uint64_t)m_framebuffer.height);
for (int32_t y = area.y; y < area.y + area.height; y++)
for (int32_t x = area.x; x < area.x + area.width; x++)
m_framebuffer.mmap[y * m_framebuffer.width + x] = m_background_image->get_color(x, y).as_rgba();
}
else
{
for (int32_t y = area.y; y < area.y + area.height; y++)
memset(&m_framebuffer.mmap[y * m_framebuffer.width + area.x], 0x10, area.width * 4);
}
for (auto& pwindow : m_client_windows)
{
auto& window = *pwindow;
// window title bar
if (auto overlap = window.title_bar_area().get_overlap(area); overlap.has_value())
{
for (int32_t y_off = 0; y_off < overlap->height; y_off++)
{
for (int32_t x_off = 0; x_off < overlap->width; x_off++)
{
uint32_t pixel = window.title_bar_pixel(
overlap->x + x_off,
overlap->y + y_off,
m_cursor
);
m_framebuffer.mmap[(overlap->y + y_off) * m_framebuffer.width + overlap->x + x_off] = pixel;
}
}
}
// window client area
if (auto overlap = window.client_area().get_overlap(area); overlap.has_value())
{
const int32_t src_x = overlap->x - window.client_x();
const int32_t src_y = overlap->y - window.client_y();
for (int32_t y_off = 0; y_off < overlap->height; y_off++)
{
memcpy(
&m_framebuffer.mmap[(overlap->y + y_off) * m_framebuffer.width + overlap->x],
&window.framebuffer()[(src_y + y_off) * window.client_width() + src_x],
overlap->width * 4
);
}
}
}
auto cursor = cursor_area();
if (auto overlap = cursor.get_overlap(area); overlap.has_value())
{
for (int32_t y_off = 0; y_off < overlap->height; y_off++)
{
for (int32_t x_off = 0; x_off < overlap->width; x_off++)
{
const int32_t rel_x = overlap->x - m_cursor.x + x_off;
const int32_t rel_y = overlap->y - m_cursor.y + y_off;
const uint32_t offset = (rel_y * s_cursor_width + rel_x) * 4;
uint32_t r = (((s_cursor_data[offset + 0] - 33) << 2) | ((s_cursor_data[offset + 1] - 33) >> 4));
uint32_t g = ((((s_cursor_data[offset + 1] - 33) & 0xF) << 4) | ((s_cursor_data[offset + 2] - 33) >> 2));
uint32_t b = ((((s_cursor_data[offset + 2] - 33) & 0x3) << 6) | ((s_cursor_data[offset + 3] - 33)));
uint32_t color = (r << 16) | (g << 8) | b;
if (color != 0xFF00FF)
m_framebuffer.mmap[(overlap->y + y_off) * m_framebuffer.width + (overlap->x + x_off)] = color;
}
}
}
const uintptr_t mmap_start = reinterpret_cast<uintptr_t>(m_framebuffer.mmap) + area.y * m_framebuffer.width * 4;
const uintptr_t mmap_end = mmap_start + (area.height + 1) * m_framebuffer.width * 4;
uintptr_t mmap_addr = mmap_start & ~(uintptr_t)0xFFF;
while (mmap_addr < mmap_end)
{
size_t index = (mmap_addr - reinterpret_cast<uintptr_t>(m_framebuffer.mmap)) / 4096;
size_t byte = index / 8;
size_t bit = index % 8;
m_pages_to_sync_bitmap[byte] |= 1 << bit;
mmap_addr += 4096;
}
}
void WindowServer::sync()
{
size_t synced_pages = 0;
for (size_t i = 0; i < m_pages_to_sync_bitmap.size() * 8; i++)
{
size_t byte = i / 8;
size_t bit = i % 8;
if (!(m_pages_to_sync_bitmap[byte] & (1 << bit)))
continue;
size_t len = 1;
while (i + len < m_pages_to_sync_bitmap.size() * 8)
{
size_t byte = (i + len) / 8;
size_t bit = (i + len) % 8;
if (!(m_pages_to_sync_bitmap[byte] & (1 << bit)))
break;
len++;
}
msync(
reinterpret_cast<uint8_t*>(m_framebuffer.mmap) + i * 4096,
len * 4096,
MS_SYNC
);
synced_pages += len;
i += len;
}
memset(m_pages_to_sync_bitmap.data(), 0, m_pages_to_sync_bitmap.size());
}
Rectangle WindowServer::cursor_area() const
{
return { m_cursor.x, m_cursor.y, s_cursor_width, s_cursor_height };
}
void WindowServer::add_client_fd(int fd)
{
MUST(m_client_fds.push_back(fd));
}
void WindowServer::remove_client_fd(int fd)
{
for (size_t i = 0; i < m_client_fds.size(); i++)
{
if (m_client_fds[i] == fd)
{
m_client_fds.remove(i);
break;
}
}
for (size_t i = 0; i < m_client_windows.size(); i++)
{
auto window = m_client_windows[i];
if (window->client_fd() == fd)
{
auto window_area = window->full_area();
m_client_windows.remove(i);
invalidate(window_area);
if (window == m_focused_window)
{
m_focused_window = nullptr;
if (!m_client_windows.empty())
set_focused_window(m_client_windows.back());
}
break;
}
}
m_deleted_window = true;
}
int WindowServer::get_client_fds(fd_set& fds) const
{
int max_fd = 0;
for (int fd : m_client_fds)
{
FD_SET(fd, &fds);
max_fd = BAN::Math::max(max_fd, fd);
}
return max_fd;
}
void WindowServer::for_each_client_fd(const BAN::Function<BAN::Iteration(int)>& callback)
{
m_deleted_window = false;
for (int fd : m_client_fds)
{
if (m_deleted_window)
break;
callback(fd);
}
}