387 lines
10 KiB
Rust
387 lines
10 KiB
Rust
/* Copyright (C) 2019-2022 Purism SPC
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* SPDX-License-Identifier: GPL-3.0+
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*/
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/*! Managing Wayland outputs */
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use std::vec::Vec;
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use crate::event_loop;
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use ::logging;
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// traits
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use ::logging::Warn;
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/// Gathers stuff defined in C or called by C
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pub mod c {
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use super::*;
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use std::os::raw::{ c_char, c_void };
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use ::util::c::{COpaquePtr, Wrapped};
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// Defined in C
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#[repr(transparent)]
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#[derive(Clone, PartialEq, Copy)]
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pub struct WlOutput(*const c_void);
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#[repr(C)]
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struct WlOutputListener<T: COpaquePtr> {
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geometry: extern fn(
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T, // data
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WlOutput,
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i32, // x
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i32, // y
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i32, // physical_width
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i32, // physical_height
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i32, // subpixel
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*const c_char, // make
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*const c_char, // model
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i32, // transform
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),
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mode: extern fn(
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T, // data
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WlOutput,
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u32, // flags
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i32, // width
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i32, // height
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i32, // refresh
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),
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done: extern fn(
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T, // data
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WlOutput,
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),
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scale: extern fn(
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T, // data
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WlOutput,
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i32, // factor
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),
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}
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bitflags!{
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/// Map to `wl_output.mode` values
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pub struct Mode: u32 {
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const NONE = 0x0;
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const CURRENT = 0x1;
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const PREFERRED = 0x2;
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}
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}
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/// Map to `wl_output.transform` values
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#[derive(Clone)]
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pub enum Transform {
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Normal = 0,
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Rotated90 = 1,
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Rotated180 = 2,
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Rotated270 = 3,
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Flipped = 4,
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FlippedRotated90 = 5,
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FlippedRotated180 = 6,
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FlippedRotated270 = 7,
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}
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impl Transform {
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fn from_u32(v: u32) -> Option<Transform> {
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use self::Transform::*;
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match v {
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0 => Some(Normal),
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1 => Some(Rotated90),
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2 => Some(Rotated180),
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3 => Some(Rotated270),
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4 => Some(Flipped),
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5 => Some(FlippedRotated90),
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6 => Some(FlippedRotated180),
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7 => Some(FlippedRotated270),
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_ => None,
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}
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}
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}
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extern "C" {
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// Rustc wrongly assumes
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// that COutputs allows C direct access to the underlying RefCell
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#[allow(improper_ctypes)]
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fn squeek_output_add_listener(
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wl_output: WlOutput,
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listener: *const WlOutputListener<COutputs>,
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data: COutputs,
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) -> i32;
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}
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/// Wrapping Outputs is required for calling its methods from C
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type COutputs = Wrapped<Outputs>;
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/// A stable reference to an output.
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#[derive(Clone)]
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#[repr(C)]
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pub struct OutputHandle {
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wl_output: WlOutput,
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outputs: COutputs,
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}
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impl OutputHandle {
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// Cannot return an Output reference
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// because COutputs is too deeply wrapped
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pub fn get_state(&self) -> Option<OutputState> {
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let outputs = self.outputs.clone_ref();
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let outputs = outputs.borrow();
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outputs
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.find_output(self.wl_output.clone())
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.map(|o| o.current.clone())
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}
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}
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// Defined in Rust
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// Callbacks from the output listener follow
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extern fn outputs_handle_geometry(
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outputs: COutputs,
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wl_output: WlOutput,
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_x: i32, _y: i32,
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_phys_width: i32, _phys_height: i32,
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_subpixel: i32,
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_make: *const c_char, _model: *const c_char,
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transform: i32,
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) {
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let transform = Transform::from_u32(transform as u32)
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.or_print(
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logging::Problem::Warning,
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"Received invalid wl_output.transform value",
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).unwrap_or(Transform::Normal);
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let outputs = outputs.clone_ref();
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let mut collection = outputs.borrow_mut();
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let output_state: Option<&mut OutputState>
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= collection
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.find_output_mut(wl_output)
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.map(|o| &mut o.pending);
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match output_state {
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Some(state) => { state.transform = Some(transform) },
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None => log_print!(
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logging::Level::Warning,
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"Got geometry on unknown output",
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),
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};
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}
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extern fn outputs_handle_mode(
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outputs: COutputs,
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wl_output: WlOutput,
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flags: u32,
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width: i32,
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height: i32,
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_refresh: i32,
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) {
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let flags = Mode::from_bits(flags)
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.or_print(
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logging::Problem::Warning,
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"Received invalid wl_output.mode flags",
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).unwrap_or(Mode::NONE);
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let outputs = outputs.clone_ref();
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let mut collection = outputs.borrow_mut();
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let output_state: Option<&mut OutputState>
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= collection
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.find_output_mut(wl_output)
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.map(|o| &mut o.pending);
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match output_state {
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Some(state) => {
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if flags.contains(Mode::CURRENT) {
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state.current_mode = Some(super::Mode { width, height});
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}
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},
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None => log_print!(
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logging::Level::Warning,
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"Got mode on unknown output",
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),
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};
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}
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extern fn outputs_handle_done(
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outputs: COutputs,
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wl_output: WlOutput,
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) {
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let outputs = outputs.clone_ref();
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let mut collection = outputs.borrow_mut();
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let output = collection
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.find_output_mut(wl_output);
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match output {
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Some(output) => { output.current = output.pending.clone(); }
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None => log_print!(
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logging::Level::Warning,
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"Got done on unknown output",
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),
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};
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}
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extern fn outputs_handle_scale(
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outputs: COutputs,
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wl_output: WlOutput,
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factor: i32,
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) {
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let outputs = outputs.clone_ref();
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let mut collection = outputs.borrow_mut();
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let output_state: Option<&mut OutputState>
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= collection
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.find_output_mut(wl_output)
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.map(|o| &mut o.pending);
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match output_state {
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Some(state) => { state.scale = factor; }
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None => log_print!(
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logging::Level::Warning,
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"Got scale on unknown output",
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),
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};
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}
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// End callbacks
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#[no_mangle]
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pub extern "C"
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fn squeek_outputs_free(outputs: COutputs) {
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unsafe { outputs.unwrap() }; // gets dropped
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}
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#[no_mangle]
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pub extern "C"
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fn squeek_outputs_register(raw_collection: COutputs, output: WlOutput) {
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let collection = raw_collection.clone_ref();
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let mut collection = collection.borrow_mut();
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collection.outputs.push(Output {
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output: output.clone(),
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pending: OutputState::uninitialized(),
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current: OutputState::uninitialized(),
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});
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unsafe { squeek_output_add_listener(
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output,
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&WlOutputListener {
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geometry: outputs_handle_geometry,
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mode: outputs_handle_mode,
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done: outputs_handle_done,
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scale: outputs_handle_scale,
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} as *const WlOutputListener<COutputs>,
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raw_collection,
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)};
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}
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#[no_mangle]
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pub extern "C"
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fn squeek_outputs_get_current(raw_collection: COutputs) -> OutputHandle {
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let collection = raw_collection.clone_ref();
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let collection = collection.borrow();
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OutputHandle {
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wl_output: collection.outputs[0].output.clone(),
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outputs: raw_collection.clone(),
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}
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}
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// TODO: handle unregistration
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}
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/// Generic size
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#[derive(Clone)]
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pub struct Size {
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pub width: u32,
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pub height: u32,
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}
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/// wl_output mode
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#[derive(Clone)]
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struct Mode {
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width: i32,
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height: i32,
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}
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#[derive(Clone)]
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pub struct OutputState {
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current_mode: Option<Mode>,
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transform: Option<c::Transform>,
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pub scale: i32,
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}
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impl OutputState {
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// More properly, this would have been a builder kind of struct,
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// with wl_output gradually adding properties to it
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// before it reached a fully initialized state,
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// when it would transform into a struct without all (some?) of the Options.
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// However, it's not clear which state is fully initialized,
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// and whether it would make things easier at all anyway.
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fn uninitialized() -> OutputState {
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OutputState {
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current_mode: None,
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transform: None,
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scale: 1,
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}
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}
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pub fn get_pixel_size(&self) -> Option<Size> {
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use self::c::Transform;
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match self {
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OutputState {
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current_mode: Some(Mode { width, height } ),
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transform: Some(transform),
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scale: _,
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} => Some(
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match transform {
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Transform::Normal
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| Transform::Rotated180
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| Transform::Flipped
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| Transform::FlippedRotated180 => Size {
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width: *width as u32,
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height: *height as u32,
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},
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_ => Size {
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width: *height as u32,
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height: *width as u32,
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},
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}
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),
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_ => None,
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}
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}
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}
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/// Not guaranteed to exist,
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/// but can be used to look up state.
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pub type OutputId = c::WlOutput;
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struct Output {
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output: c::WlOutput,
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pending: OutputState,
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current: OutputState,
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}
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pub struct Outputs {
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outputs: Vec<Output>,
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sender: event_loop::driver::Threaded,
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}
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impl Outputs {
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pub fn new(sender: event_loop::driver::Threaded) -> Outputs {
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Outputs {
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outputs: Vec::new(),
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sender,
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}
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}
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fn find_output(&self, wl_output: c::WlOutput) -> Option<&Output> {
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self.outputs
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.iter()
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.find_map(|o|
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if o.output == wl_output { Some(o) } else { None }
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)
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}
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fn find_output_mut(&mut self, wl_output: c::WlOutput)
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-> Option<&mut Output>
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{
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self.outputs
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.iter_mut()
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.find_map(|o|
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if o.output == wl_output { Some(o) } else { None }
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)
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}
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}
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