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use std::os::raw::*;
use parking_lot::Mutex;
use {PhysicalPosition, PhysicalSize};
use super::{util, XConnection, XError};
use super::ffi::{
RRCrtcChangeNotifyMask,
RROutputPropertyNotifyMask,
RRScreenChangeNotifyMask,
True,
Window,
XRRScreenResources,
};
const FORCE_RANDR_COMPAT: bool = false;
const DISABLE_MONITOR_LIST_CACHING: bool = false;
lazy_static! {
static ref XRANDR_VERSION: Mutex<Option<(c_int, c_int)>> = Mutex::default();
static ref MONITORS: Mutex<Option<Vec<MonitorId>>> = Mutex::default();
}
fn version_is_at_least(major: c_int, minor: c_int) -> bool {
if let Some((avail_major, avail_minor)) = *XRANDR_VERSION.lock() {
if avail_major == major {
avail_minor >= minor
} else {
avail_major > major
}
} else {
unreachable!();
}
}
pub fn invalidate_cached_monitor_list() -> Option<Vec<MonitorId>> {
(*MONITORS.lock()).take()
}
#[derive(Debug, Clone)]
pub struct MonitorId {
id: u32,
pub(crate) name: String,
dimensions: (u32, u32),
position: (i32, i32),
primary: bool,
pub(crate) hidpi_factor: f64,
pub(crate) rect: util::AaRect,
}
impl MonitorId {
fn from_repr(
xconn: &XConnection,
resources: *mut XRRScreenResources,
id: u32,
repr: util::MonitorRepr,
primary: bool,
) -> Option<Self> {
let (name, hidpi_factor) = unsafe { xconn.get_output_info(resources, &repr)? };
let (dimensions, position) = unsafe { (repr.get_dimensions(), repr.get_position()) };
let rect = util::AaRect::new(position, dimensions);
Some(MonitorId {
id,
name,
hidpi_factor,
dimensions,
position,
primary,
rect,
})
}
pub fn get_name(&self) -> Option<String> {
Some(self.name.clone())
}
#[inline]
pub fn get_native_identifier(&self) -> u32 {
self.id as u32
}
pub fn get_dimensions(&self) -> PhysicalSize {
self.dimensions.into()
}
pub fn get_position(&self) -> PhysicalPosition {
self.position.into()
}
#[inline]
pub fn get_hidpi_factor(&self) -> f64 {
self.hidpi_factor
}
}
impl XConnection {
pub fn get_monitor_for_window(&self, window_rect: Option<util::AaRect>) -> MonitorId {
let monitors = self.get_available_monitors();
let default = monitors
.get(0)
.expect("[winit] Failed to find any monitors using XRandR.");
let window_rect = match window_rect {
Some(rect) => rect,
None => return default.to_owned(),
};
let mut largest_overlap = 0;
let mut matched_monitor = default;
for monitor in &monitors {
let overlapping_area = window_rect.get_overlapping_area(&monitor.rect);
if overlapping_area > largest_overlap {
largest_overlap = overlapping_area;
matched_monitor = &monitor;
}
}
matched_monitor.to_owned()
}
fn query_monitor_list(&self) -> Vec<MonitorId> {
unsafe {
let root = (self.xlib.XDefaultRootWindow)(self.display);
let resources = if version_is_at_least(1, 3) {
(self.xrandr.XRRGetScreenResourcesCurrent)(self.display, root)
} else {
(self.xrandr.XRRGetScreenResources)(self.display, root)
};
if resources.is_null() {
panic!("[winit] `XRRGetScreenResources` returned NULL. That should only happen if the root window doesn't exist.");
}
let mut available;
let mut has_primary = false;
if self.xrandr_1_5.is_some() && version_is_at_least(1, 5) && !FORCE_RANDR_COMPAT {
let xrandr_1_5 = self.xrandr_1_5.as_ref().unwrap();
let mut monitor_count = 0;
let monitors = (xrandr_1_5.XRRGetMonitors)(self.display, root, 1, &mut monitor_count);
assert!(monitor_count >= 0);
available = Vec::with_capacity(monitor_count as usize);
for monitor_index in 0..monitor_count {
let monitor = monitors.offset(monitor_index as isize);
let is_primary = (*monitor).primary != 0;
has_primary |= is_primary;
MonitorId::from_repr(
self,
resources,
monitor_index as u32,
monitor.into(),
is_primary,
).map(|monitor_id| available.push(monitor_id));
}
(xrandr_1_5.XRRFreeMonitors)(monitors);
} else {
let primary = (self.xrandr.XRRGetOutputPrimary)(self.display, root);
available = Vec::with_capacity((*resources).ncrtc as usize);
for crtc_index in 0..(*resources).ncrtc {
let crtc_id = *((*resources).crtcs.offset(crtc_index as isize));
let crtc = (self.xrandr.XRRGetCrtcInfo)(self.display, resources, crtc_id);
let is_active = (*crtc).width > 0 && (*crtc).height > 0 && (*crtc).noutput > 0;
if is_active {
let crtc = util::MonitorRepr::from(crtc);
let is_primary = crtc.get_output() == primary;
has_primary |= is_primary;
MonitorId::from_repr(
self,
resources,
crtc_id as u32,
crtc,
is_primary,
).map(|monitor_id| available.push(monitor_id));
}
(self.xrandr.XRRFreeCrtcInfo)(crtc);
}
}
if !has_primary {
if let Some(ref mut fallback) = available.first_mut() {
fallback.primary = true;
}
}
(self.xrandr.XRRFreeScreenResources)(resources);
available
}
}
pub fn get_available_monitors(&self) -> Vec<MonitorId> {
let mut monitors_lock = MONITORS.lock();
(*monitors_lock)
.as_ref()
.cloned()
.or_else(|| {
let monitors = Some(self.query_monitor_list());
if !DISABLE_MONITOR_LIST_CACHING {
(*monitors_lock) = monitors.clone();
}
monitors
})
.unwrap()
}
#[inline]
pub fn get_primary_monitor(&self) -> MonitorId {
self.get_available_monitors()
.into_iter()
.find(|monitor| monitor.primary)
.expect("[winit] Failed to find any monitors using XRandR.")
}
pub fn select_xrandr_input(&self, root: Window) -> Result<c_int, XError> {
{
let mut version_lock = XRANDR_VERSION.lock();
if version_lock.is_none() {
let mut major = 0;
let mut minor = 0;
let has_extension = unsafe {
(self.xrandr.XRRQueryVersion)(
self.display,
&mut major,
&mut minor,
)
};
if has_extension != True {
panic!("[winit] XRandR extension not available.");
}
*version_lock = Some((major, minor));
}
}
let mut event_offset = 0;
let mut error_offset = 0;
let status = unsafe {
(self.xrandr.XRRQueryExtension)(
self.display,
&mut event_offset,
&mut error_offset,
)
};
if status != True {
self.check_errors()?;
unreachable!("[winit] `XRRQueryExtension` failed but no error was received.");
}
let mask = RRCrtcChangeNotifyMask
| RROutputPropertyNotifyMask
| RRScreenChangeNotifyMask;
unsafe { (self.xrandr.XRRSelectInput)(self.display, root, mask) };
Ok(event_offset)
}
}