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fix(cursor): delegate native image scaling to cursor plugin

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Use the original Flutter image and source hotspot with explicit DPR, retaining the existing view and minimum-size policies. Pin the plugin implementation from rustdesk-org/flutter_custom_cursor#1.
This commit is contained in:
fufesou
2026-09-12 01:40:26 +08:00
parent 8da629c57d
commit 1061670368
5 changed files with 155 additions and 29 deletions
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45
flutter/lib/native/custom_cursor.dart
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@@ -1,10 +1,14 @@
import 'dart:async';
import 'package:flutter_custom_cursor/cursor_manager.dart'
as custom_cursor_manager;
import 'package:flutter_custom_cursor/flutter_custom_cursor.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart' show WidgetsBinding;
import 'package:flutter_hbb/common.dart';
import 'package:flutter_hbb/models/model.dart';
deleteCustomCursor(String key) =>
@@ -16,27 +20,32 @@ MouseCursor buildCursorOfCache(
if (cache == null) {
return MouseCursor.defer;
} else {
final key = cache.updateGetKey(scale);
// Include the live DPR so moving between monitors rebuilds the native
// bitmap even when the remote view scale has not changed.
final dpr = WidgetsBinding
.instance.platformDispatcher.views.single.devicePixelRatio;
final key = '${cache.updateGetKey(scale, resizeImage: false)}_$dpr';
if (!cursor.cachedKeys.contains(key)) {
// data should be checked here, because it may be changed after `updateGetKey()`
final data = cache.data;
if (data == null) {
return MouseCursor.defer;
}
debugPrint(
"Register custom cursor with key $key (${cache.hotx},${cache.hoty})");
// [Safety]
// It's ok to call async registerCursor in current synchronous context,
// because activating the cursor is also an async call and will always
// be executed after this.
custom_cursor_manager.CursorManager.instance
.registerCursor(custom_cursor_manager.CursorData()
..name = key
..buffer = data
..width = (cache.width * cache.scale).toInt()
..height = (cache.height * cache.scale).toInt()
..hotX = cache.hotx
..hotY = cache.hoty);
unawaited(custom_cursor_manager.CursorManager.instance
.registerCursorImage(
name: key,
image: cache.nativeImage,
hotSpot: Offset(cache.hotxOrigin, cache.hotyOrigin),
// Windows callers already express scale in physical pixels.
// The plugin takes logical scale and applies DPR during rasterization.
scale: isWindows ? cache.scale / dpr : cache.scale,
devicePixelRatio: dpr,
)
.then<void>((_) {}, onError: (Object error, StackTrace stack) {
cursor.cachedKeys.remove(key);
FlutterError.reportError(FlutterErrorDetails(
exception: error,
stack: stack,
library: 'native cursor',
context: ErrorDescription('registering cursor $key')));
}));
cursor.addKey(key);
}
return FlutterCustomMemoryImageCursor(key: key);