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Preserve Windows cursor alpha during native image decoding

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fufesou
2026-09-12 22:52:36 +08:00
parent afdd1d5c9d
commit 1fabdd6a9c
2 changed files with 10 additions and 5 deletions
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11
flutter/lib/models/model.dart
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@@ -3461,9 +3461,10 @@ class CursorModel with ChangeNotifier {
List<dynamic> colors = json.decode(evt['colors']);
final rgba = Uint8List.fromList(colors.map((s) => s as int).toList());
final ui.Image? image;
final platform = parent.target?.ffiModel.pi.platform;
if (!isWeb &&
parent.target?.ffiModel.pi.platform == kPeerPlatformMacOS) {
image = await _decodeMacCursor(rgba, width, height);
(platform == kPeerPlatformMacOS || platform == kPeerPlatformWindows)) {
image = await _decodeStraightAlphaCursor(rgba, width, height);
} else {
image = await img.decodeImageFromPixels(
rgba, width, height, ui.PixelFormat.rgba8888);
@@ -3484,10 +3485,10 @@ class CursorModel with ChangeNotifier {
_updateCurData();
}
Future<ui.Image?> _decodeMacCursor(
Future<ui.Image?> _decodeStraightAlphaCursor(
Uint8List rgba, int width, int height) async {
// macOS packets keep straight alpha, regardless of density metadata.
// Premultiply only for native ui.Image; the PNG cache needs straight colors.
// macOS and Win32 capture send straight alpha; XFixes/DRM are premultiplied.
// Convert a copy for native ui.Image, preserving the wire and PNG cache colors.
final source = img2.Image.fromBytes(
width: width, height: height, bytes: rgba.buffer, order: img2.ChannelOrder.rgba);
for (final pixel in source) {