Report Linux cursor density independently of the host UI

Cargo.toml

@@ -25,7 +25,7 @@ inline = []
 use_samplerate = ["samplerate"]
 use_rubato = ["rubato"]
 use_dasp = ["dasp"]
-flutter = ["flutter_rust_bridge", "dep:x11rb"]
+flutter = ["flutter_rust_bridge"]
 default = ["use_dasp"]
 hwcodec = ["scrap/hwcodec"]
 vram = ["scrap/vram"]
@@ -40,7 +40,6 @@ drm-wake = ["drm"]
 linux-pkg-config = ["magnum-opus/linux-pkg-config", "scrap/linux-pkg-config"]
 unix-file-copy-paste = [
     "dep:x11-clipboard",
-    "dep:x11rb",
     "dep:percent-encoding",
     "dep:once_cell",
     "clipboard/unix-file-copy-paste",
@@ -191,7 +190,7 @@ evdev = { git="https://github.com/rustdesk-org/evdev" }
 dbus = "0.9"
 dbus-crossroads = "0.5"
 x11-clipboard = {git="https://github.com/clslaid/x11-clipboard", branch = "feat/store-batch", optional = true}
-x11rb =  {version = "0.12", features = ["all-extensions"], optional = true}
+x11rb =  {version = "0.12", features = ["all-extensions"]}
 percent-encoding = {version = "2.3", optional = true}
 once_cell = {version = "1.18", optional = true}
 nix = { version = "0.29", features = ["term", "process"]}

src/platform/linux.rs

@@ -35,11 +35,7 @@ use std::{
 use terminfo::{capability as cap, Database};
 use wallpaper;
 
-// Scope density lookup to Flutter host builds to preserve legacy capture
-// behavior. These builds include density in cursor IDs to refresh on DPI
-// changes; non-Flutter builds retain original IDs and unknown density.
-// This gate describes the host binary, not the connected controller's UI.
-#[cfg(feature = "flutter")]
+// Cursor density is capture metadata, independent of either endpoint's UI.
 mod cursor;
 
 pub const PA_SAMPLE_RATE: u32 = 48000;
@@ -577,11 +573,8 @@ pub fn get_cursor() -> ResultType<Option<u64>> {
     // polled there is a live session, which is the case the latch reads correctly.
     #[cfg(feature = "drm")]
     if !is_x11() {
-        #[cfg(feature = "flutter")]
         let cursor = cursor::drm_snapshot(|c| c.id)?
             .map(|(id, scale)| cursor::cache_id(id, scale));
-        #[cfg(not(feature = "flutter"))]
-        let cursor = crate::server::drm_capturer::drm_cursor_id();
         if let Some(id) = cursor {
             // In a mixed DRM + PipeWire session the DRM streams only cover the DRM-backed displays;
             // when the pointer sits on a PipeWire-served display every DRM stream reports the hidden
@@ -610,7 +603,6 @@ pub fn get_cursor() -> ResultType<Option<u64>> {
             }
         }
     });
-    #[cfg(feature = "flutter")]
     let res = res.map(cursor::x11_cursor_id);
     Ok(res)
 }
@@ -624,13 +616,8 @@ pub fn get_cursor_data(hcursor: u64) -> ResultType<CursorData> {
     // agree anyway, since a caller that took the DRM branch there has to take it here.
     #[cfg(feature = "drm")]
     if !is_x11() {
-        #[cfg(feature = "flutter")]
         let cursor = cursor::drm_snapshot(Clone::clone)?;
-        #[cfg(not(feature = "flutter"))]
-        let cursor = crate::server::drm_capturer::drm_cursor();
-        if let Some(c) = cursor {
-            #[cfg(feature = "flutter")]
-            let (c, scale) = c;
+        if let Some((c, scale)) = cursor {
             // See get_cursor(): a hidden DRM sentinel is authoritative only in a pure-DRM session. In
             // a mixed DRM + PipeWire session fall through so the PipeWire display's cursor is served
             // by the normal path instead of being hidden everywhere.
@@ -638,27 +625,19 @@ pub fn get_cursor_data(hcursor: u64) -> ResultType<CursorData> {
                 || !crate::server::display_service::has_non_drm_backed_display()
             {
                 let mut cd: CursorData = Default::default();
-                cd.id = c.id;
+                cd.id = cursor::cache_id(c.id, scale);
+                cd.scale = scale;
                 cd.width = c.width;
                 cd.height = c.height;
                 cd.hotx = c.hotx;
                 cd.hoty = c.hoty;
                 cd.colors = c.colors.into();
-                #[cfg(feature = "flutter")]
-                {
-                    cd.id = cursor::cache_id(cd.id, scale);
-                    cd.scale = scale;
-                }
                 return Ok(cd);
             }
         }
     }
-    #[cfg(feature = "flutter")]
     let scale = cursor::x11_cursor_scale();
-    #[cfg(feature = "flutter")]
     let matches = |id| cursor::cache_id(id, scale) == hcursor;
-    #[cfg(not(feature = "flutter"))]
-    let matches = |id| id == hcursor;
     let mut res = None;
     DISPLAY.with(|conn| {
         if let Ok(ref mut d) = conn.try_borrow_mut() {
@@ -673,10 +652,7 @@ pub fn get_cursor_data(hcursor: u64) -> ResultType<CursorData> {
                         cd.height = (*img).height as _;
                         // to-do: how about if it is 0
                         cd.id = hcursor;
-                        #[cfg(feature = "flutter")]
-                        {
-                            cd.scale = scale;
-                        }
+                        cd.scale = scale;
                         let pixels =
                             std::slice::from_raw_parts((*img).pixels, (cd.width * cd.height) as _);
                         // cd.colors.resize(pixels.len() * 4, 0);

src/server/drm_capturer.rs

@@ -14,7 +14,6 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Condvar, Mutex};
 use std::time::{Duration, Instant};
 
-#[cfg(feature = "flutter")]
 mod cursor_metadata;
 
 const HANDSHAKE_TIMEOUT_MS: u64 = 3000;
@@ -958,26 +957,8 @@ fn fold_cursor_id(id: u64, t: i32) -> u64 {
     }
 }
 
-fn with_drm_cursor<T>(f: impl Fn(&DrmCursorData) -> T) -> Option<T> {
-    let map = DRM_CURSOR.lock().unwrap();
-    map.values()
-        .map(|(_, c)| c)
-        .find(|c| c.id != scrap::drm_reader::HIDDEN_CURSOR_ID)
-        .or_else(|| map.values().map(|(_, c)| c).next())
-        .map(f)
-}
-
-pub fn drm_cursor_id() -> Option<u64> {
-    with_drm_cursor(|c| c.id)
-}
-
-/// Snapshot of the DRM hardware cursor, or None. The pixels are premultiplied ARGB and are passed
-/// through as-is, like the XFixes path, so the client sees one cursor format from either backend.
-pub fn drm_cursor() -> Option<DrmCursorData> {
-    with_drm_cursor(|c| c.clone())
-}
-
-#[cfg(feature = "flutter")]
+/// Snapshot of the DRM hardware cursor and optional display metadata. Pixels retain the
+/// premultiplied format used by the XFixes path.
 pub fn drm_cursor_snapshot<T>(
     f: impl Fn(&DrmCursorData) -> T,
 ) -> Option<(T, Option<base::platform::linux::WaylandDisplayInfo>)> {
@@ -1019,7 +1000,6 @@ pub fn drm_cursor_snapshot<T>(
     Some((value, monitor))
 }
 
-#[cfg(feature = "flutter")]
 fn cursor_monitor(
     display: usize,
     state: &ProbeState,
@@ -2332,7 +2312,6 @@ mod drm_capturer_tests {
         assert!(m2[0].is_none() && m2[1].is_none());
     }
 
-    #[cfg(feature = "flutter")]
     #[test]
     fn cursor_monitor_reserves_other_displays_before_guessing_density() {
         let state = ProbeState::Available(