Revert "Use scap library to implement screensharing on X11 (#27807)" (#28141)

This reverts commit c2afc2271b.

Build on ARM if failing, likely because `c_char` is `u8` on arm and `i8`
on x86:

```
error[E0308]: mismatched types
   --> /home/runner/.cargo/git/checkouts/scap-40ad33e1dd47aaea/5715067/src/targets/linux/mod.rs:75:74
    |
75  |     let result = unsafe { XmbTextPropertyToTextList(display, &mut xname, &mut list, &mut count) };
    |                           -------------------------                      ^^^^^^^^^ expected `*mut *mut *mut u8`, found `&mut *mut *mut i8`
    |                           |
    |                           arguments to this function are incorrect
    |
    = note:    expected raw pointer `*mut *mut *mut u8`
            found mutable reference `&mut *mut *mut i8`
note: function defined here
   --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/x11-2.21.0/src/xlib.rs:552:10
    |
552 |   pub fn XmbTextPropertyToTextList (_4: *mut Display, _3: *const XTextProperty, _2: *mut *mut *mut c_char, _1: *mut c_int) -> c_int,
    |          ^^^^^^^^^^^^^^^^^^^^^^^^^
```

Release Notes:

- N/A

crates/gpui/src/platform/linux/headless/client.rs

@@ -1,16 +1,13 @@
 use std::cell::RefCell;
 use std::rc::Rc;
 
-use anyhow::anyhow;
 use calloop::{EventLoop, LoopHandle};
-use futures::channel::oneshot;
+
 use util::ResultExt;
 
 use crate::platform::linux::LinuxClient;
 use crate::platform::{LinuxCommon, PlatformWindow};
-use crate::{
-    AnyWindowHandle, CursorStyle, DisplayId, PlatformDisplay, ScreenCaptureSource, WindowParams,
-};
+use crate::{AnyWindowHandle, CursorStyle, DisplayId, PlatformDisplay, WindowParams};
 
 pub struct HeadlessClientState {
     pub(crate) _loop_handle: LoopHandle<'static, HeadlessClient>,
@@ -66,21 +63,6 @@ impl LinuxClient for HeadlessClient {
         None
     }
 
-    fn is_screen_capture_supported(&self) -> bool {
-        false
-    }
-
-    fn screen_capture_sources(
-        &self,
-    ) -> oneshot::Receiver<anyhow::Result<Vec<Box<dyn ScreenCaptureSource>>>> {
-        let (mut tx, rx) = oneshot::channel();
-        tx.send(Err(anyhow!(
-            "Headless mode does not support screen capture."
-        )))
-        .ok();
-        rx
-    }
-
     fn active_window(&self) -> Option<AnyWindowHandle> {
         None
     }

crates/gpui/src/platform/linux/platform.rs

@@ -28,7 +28,6 @@ use crate::{
     Pixels, Platform, PlatformDisplay, PlatformTextSystem, PlatformWindow, Point, Result,
     ScreenCaptureSource, Task, WindowAppearance, WindowParams, px,
 };
-
 #[cfg(any(feature = "wayland", feature = "x11"))]
 pub(crate) const SCROLL_LINES: f32 = 3.0;
 
@@ -51,10 +50,6 @@ pub trait LinuxClient {
     #[allow(unused)]
     fn display(&self, id: DisplayId) -> Option<Rc<dyn PlatformDisplay>>;
     fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>>;
-    fn is_screen_capture_supported(&self) -> bool;
-    fn screen_capture_sources(
-        &self,
-    ) -> oneshot::Receiver<Result<Vec<Box<dyn ScreenCaptureSource>>>>;
 
     fn open_window(
         &self,
@@ -235,14 +230,12 @@ impl<P: LinuxClient + 'static> Platform for P {
         self.displays()
     }
 
-    fn is_screen_capture_supported(&self) -> bool {
-        self.is_screen_capture_supported()
-    }
-
     fn screen_capture_sources(
         &self,
     ) -> oneshot::Receiver<Result<Vec<Box<dyn ScreenCaptureSource>>>> {
-        self.screen_capture_sources()
+        let (mut tx, rx) = oneshot::channel();
+        tx.send(Err(anyhow!("screen capture not implemented"))).ok();
+        rx
     }
 
     fn active_window(&self) -> Option<AnyWindowHandle> {

crates/gpui/src/platform/linux/wayland/client.rs

@@ -7,7 +7,6 @@ use std::{
     time::{Duration, Instant},
 };
 
-use anyhow::anyhow;
 use calloop::{
     EventLoop, LoopHandle,
     timer::{TimeoutAction, Timer},
@@ -15,7 +14,7 @@ use calloop::{
 use calloop_wayland_source::WaylandSource;
 use collections::HashMap;
 use filedescriptor::Pipe;
-use futures::channel::oneshot;
+
 use http_client::Url;
 use smallvec::SmallVec;
 use util::ResultExt;
@@ -86,8 +85,7 @@ use crate::{
     FileDropEvent, ForegroundExecutor, KeyDownEvent, KeyUpEvent, Keystroke, LinuxCommon, Modifiers,
     ModifiersChangedEvent, MouseButton, MouseDownEvent, MouseExitEvent, MouseMoveEvent,
     MouseUpEvent, NavigationDirection, Pixels, PlatformDisplay, PlatformInput, Point, SCROLL_LINES,
-    ScaledPixels, ScreenCaptureSource, ScrollDelta, ScrollWheelEvent, Size, TouchPhase,
-    WindowParams, point, px, size,
+    ScaledPixels, ScrollDelta, ScrollWheelEvent, Size, TouchPhase, WindowParams, point, px, size,
 };
 
 /// Used to convert evdev scancode to xkb scancode
@@ -635,24 +633,6 @@ impl LinuxClient for WaylandClient {
         None
     }
 
-    fn is_screen_capture_supported(&self) -> bool {
-        false
-    }
-
-    fn screen_capture_sources(
-        &self,
-    ) -> oneshot::Receiver<anyhow::Result<Vec<Box<dyn ScreenCaptureSource>>>> {
-        // TODO: Get screen capture working on wayland. Be sure to try window resizing as that may
-        // be tricky.
-        //
-        // start_scap_default_target_source()
-        let (sources_tx, sources_rx) = oneshot::channel();
-        sources_tx
-            .send(Err(anyhow!("Wayland screen capture not yet implemented.")))
-            .ok();
-        sources_rx
-    }
-
     fn open_window(
         &self,
         handle: AnyWindowHandle,

crates/gpui/src/platform/linux/x11/client.rs

@@ -1,4 +1,3 @@
-use crate::platform::scap_screen_capture::scap_screen_sources;
 use core::str;
 use std::{
     cell::RefCell,
@@ -9,13 +8,13 @@ use std::{
     time::{Duration, Instant},
 };
 
-use anyhow::Context as _;
 use calloop::{
     EventLoop, LoopHandle, RegistrationToken,
     generic::{FdWrapper, Generic},
 };
+
+use anyhow::Context as _;
 use collections::HashMap;
-use futures::channel::oneshot;
 use http_client::Url;
 use smallvec::SmallVec;
 use util::ResultExt;
@@ -60,8 +59,8 @@ use crate::platform::{
 use crate::{
     AnyWindowHandle, Bounds, ClipboardItem, CursorStyle, DisplayId, FileDropEvent, Keystroke,
     Modifiers, ModifiersChangedEvent, MouseButton, Pixels, Platform, PlatformDisplay,
-    PlatformInput, Point, RequestFrameOptions, ScaledPixels, ScreenCaptureSource, ScrollDelta,
-    Size, TouchPhase, WindowParams, X11Window, modifiers_from_xinput_info, point, px,
+    PlatformInput, Point, RequestFrameOptions, ScaledPixels, ScrollDelta, Size, TouchPhase,
+    WindowParams, X11Window, modifiers_from_xinput_info, point, px,
 };
 
 /// Value for DeviceId parameters which selects all devices.
@@ -1328,16 +1327,6 @@ impl LinuxClient for X11Client {
         ))
     }
 
-    fn is_screen_capture_supported(&self) -> bool {
-        true
-    }
-
-    fn screen_capture_sources(
-        &self,
-    ) -> oneshot::Receiver<anyhow::Result<Vec<Box<dyn ScreenCaptureSource>>>> {
-        scap_screen_sources(&self.0.borrow().common.foreground_executor)
-    }
-
     fn open_window(
         &self,
         handle: AnyWindowHandle,