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#ifndef SAW_UNIX_XCB
#error "XCB is not supported"
#endif
#include "xcb.h"
namespace saw {
namespace gfx {
device<backend::linux_xcb>::device(::Display* disp, int screen, xcb_connection_t *xcb_connection, xcb_screen_t *xcb_screen, own<input_stream>&& an):
display_{disp}, screen_{screen}, xcb_connection_{xcb_connection}, xcb_screen_{xcb_screen}, async_notifier_{std::move(an)},
async_conveyor_{async_notifier_->read_ready()
.then([this]() { handle_events(); })
.sink()} {}
device<backend::linux_xcb>::~device(){
if (display_) {
xcb_flush(xcb_connection_);
::XCloseDisplay(display_);
}
}
void device<backend::linux_xcb>::xcb_window_was_destroyed(xcb_window_t window_id){
windows_.erase(window_id);
}
void device<backend::linux_xcb>::handle_events(){
while (xcb_generic_event_t *event = xcb_poll_for_event(xcb_connection_)) {
pending_events_.push_back(event);
}
for (size_t i = 0; i < pending_events_.size(); ++i) {
xcb_generic_event_t *event = pending_events_.at(i);
switch (event->response_type & ~0x80) {
case XCB_MOTION_NOTIFY: {
xcb_motion_notify_event_t *motion =
reinterpret_cast<xcb_motion_notify_event_t *>(event);
auto find = windows_.find(motion->event);
if (find != windows_.end()) {
assert(find->second);
find->second->mouse_move_event(motion->event_x,
motion->event_y);
}
} break;
case XCB_EXPOSE: {
xcb_expose_event_t *expose =
reinterpret_cast<xcb_expose_event_t *>(event);
auto find = windows_.find(expose->window);
if (find != windows_.end()) {
assert(find->second);
find->second->resize_event(static_cast<size_t>(expose->x),
static_cast<size_t>(expose->y),
static_cast<size_t>(expose->width),
static_cast<size_t>(expose->height));
}
} break;
case XCB_BUTTON_RELEASE: {
xcb_button_release_event_t *button =
reinterpret_cast<xcb_button_release_event_t *>(event);
auto find = windows_.find(button->event);
if (find != windows_.end()) {
assert(find->second);
find->second->mouse_event(button->event_x, button->event_y,
button->detail, false);
}
} break;
case XCB_BUTTON_PRESS: {
xcb_button_press_event_t *button =
reinterpret_cast<xcb_button_press_event_t *>(event);
auto find = windows_.find(button->event);
if (find != windows_.end()) {
assert(find->second);
find->second->mouse_event(button->event_x, button->event_y,
button->detail, true);
}
} break;
case XCB_KEY_RELEASE: {
xcb_key_release_event_t *key =
reinterpret_cast<xcb_key_release_event_t *>(event);
bool repeat = false;
/*
* Peek into future events
*/
for (size_t j = i + 1; j < pending_events_.size(); ++j) {
xcb_generic_event_t *f_ev = pending_events_.at(j);
if ((f_ev->response_type & ~0x80) == XCB_KEY_PRESS) {
xcb_key_press_event_t *f_key =
reinterpret_cast<xcb_key_press_event_t *>(f_ev);
if (key->detail == f_key->detail &&
key->event == f_key->event) {
auto iterator = pending_events_.begin() + j;
assert(iterator != pending_events_.end());
free(*iterator);
pending_events_.erase(iterator);
repeat = true;
break;
}
}
}
auto find = windows_.find(key->event);
if (find != windows_.end()) {
assert(find->second);
find->second->keyboard_event(key->event_x, key->event_y,
key->detail, repeat, repeat);
}
} break;
case XCB_KEY_PRESS: {
xcb_key_press_event_t *key =
reinterpret_cast<xcb_key_press_event_t *>(event);
auto find = windows_.find(key->event);
if (find != windows_.end()) {
assert(find->second);
find->second->keyboard_event(key->event_x, key->event_y,
key->detail, true, false);
}
} break;
default:
break;
}
}
for (xcb_generic_event_t *event : pending_events_) {
free(event);
}
pending_events_.clear();
}
own<window<backend::linux_xcb>> device<backend::linux_xcb>::create_xcb_window(const video_mode &vid_mode,
std::string_view title_view,
int visual_id) {
assert(xcb_screen_);
assert(xcb_connection_);
xcb_colormap_t xcb_colormap = xcb_generate_id(xcb_connection_);
xcb_window_t xcb_window = xcb_generate_id(xcb_connection_);
xcb_create_colormap(xcb_connection_, XCB_COLORMAP_ALLOC_NONE, xcb_colormap,
xcb_screen_->root, visual_id);
uint32_t eventmask =
XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
XCB_EVENT_MASK_KEY_RELEASE | XCB_EVENT_MASK_BUTTON_PRESS |
XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION |
XCB_EVENT_MASK_BUTTON_MOTION;
uint32_t valuelist[] = {eventmask, xcb_colormap, 0};
uint32_t valuemask = XCB_CW_EVENT_MASK | XCB_CW_COLORMAP;
xcb_create_window(xcb_connection_, XCB_COPY_FROM_PARENT, xcb_window,
xcb_screen_->root, 0, 0, vid_mode.width,
vid_mode.height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
visual_id, valuemask, valuelist);
xcb_change_property(xcb_connection_, XCB_PROP_MODE_REPLACE, xcb_window,
XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8, title_view.size(),
title_view.data());
xcb_flush(xcb_connection_);
auto win = heap<window<backend::linux_xcb>>(*this, xcb_window, xcb_colormap,
vid_mode, title_view);
// Insert into map
windows_[xcb_window] = win.get();
return win;
}
own<window<backend::linux_xcb>> device<backend::linux_xcb>::create_window(const video_mode& vid_mode, std::string_view title_view){
assert(xcb_screen_);
return create_xcb_window(vid_mode, title_view, xcb_screen_->root_visual);
}
void device<backend::linux_xcb>::flush(){
assert(xcb_connection_);
xcb_flush(xcb_connection_);
}
error_or<own<device<backend::linux_xcb>>> create_xcb_device(io_provider& provider){
::Display *display = ::XOpenDisplay(nullptr);
if (!display) {
/// @todo log errors
return make_error<err::critical>();
}
int screen = ::XDefaultScreen(display);
xcb_connection_t *xcb_connection = ::XGetXCBConnection(display);
if (!xcb_connection) {
/// @todo log errors
::XCloseDisplay(display);
return make_error<err::critical>();
}
int fd = xcb_get_file_descriptor(xcb_connection);
own<input_stream> fd_wrapped = provider.wrap_input_fd(fd);
if (!fd_wrapped) {
::XCloseDisplay(display);
return make_error<err::critical>();
}
::XSetEventQueueOwner(display, XCBOwnsEventQueue);
xcb_screen_iterator_t screen_iter =
xcb_setup_roots_iterator(xcb_get_setup(xcb_connection));
for (int screen_i = screen; screen_iter.rem && screen_i > 0;
--screen_i, xcb_screen_next(&screen_iter))
;
xcb_screen_t *xcb_screen = screen_iter.data;
return heap<device<backend::linux_xcb>>(display, screen, xcb_connection, xcb_screen, std::move(fd_wrapped));
}
window<backend::linux_xcb>::window(device<backend::linux_xcb>& dev_, xcb_window_t xcb_win, xcb_colormap_t xcb_colormap_, const video_mode& vid_mode_, const std::string_view& title_view_):
device_{&dev_},
xcb_window_{xcb_win},
xcb_colormap_{xcb_colormap_},
video_mode_{vid_mode_},
window_title_{title_view_}
{}
window<backend::linux_xcb>::~window(){
device_.window_destroyed(xcb_window_);
xcb_destroy_window(device_.xcb_connection, xcb_window_);
device_.flush();
}
void window<backend::linux_xcb>::show(){
assert(device_.xcb_connection);
xcb_map_window(device_.xcb_connection, xcb_window_);
}
void window<backend::linux_xcb>::hide(){
assert(device_.xcb_connection);
xcb_unmap_window(device_.xcb_connection, xcb_window_);
}
const video_mode& window<backend::linux_xcb::get_video_mode() const {
return video_mode_;
}
}
}
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