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fix(cursor): decode predefined PNG images with correct alpha

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Use Flutter's PNG codec before native rasterization and retain the straight-alpha image cache. Cover both bundled assets through PNG and Windows BGRA registration.
This commit is contained in:
fufesou
2026-09-12 17:46:57 +08:00
parent 1d98d1a647
commit cb068ba5df
2 changed files with 65 additions and 10 deletions
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21
flutter/lib/models/model.dart
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@@ -2985,7 +2985,8 @@ class PredefinedCursor {
CursorData? get cache => _cache;
init() {
_image2 = img2.decodePng(base64Decode(png));
final pngBytes = base64Decode(png);
_image2 = img2.decodePng(pngBytes);
if (_image2 != null) {
// The png type of forbidden cursor image is `PngColorType.indexed`.
if (id == kPreForbiddenCursorId) {
@@ -2993,18 +2994,18 @@ class PredefinedCursor {
}
() async {
final defaultImg = _image2!;
// This function is called only one time, no need to care about the performance.
Uint8List data = defaultImg.getBytes(order: img2.ChannelOrder.rgba);
_image?.dispose();
final nativeImage = await img.decodeImageFromPixels(
data, defaultImg.width, defaultImg.height, ui.PixelFormat.rgba8888);
_image = nativeImage;
if (nativeImage == null) {
print("decodeImageFromPixels failed, pre-defined cursor $id");
return;
// PNG stores straight alpha; let the codec prepare the pixels for ui.Image.
final codec = await ui.instantiateImageCodec(pngBytes);
final ui.Image nativeImage;
try {
nativeImage = (await codec.getNextFrame()).image;
} finally {
codec.dispose();
}
_image = nativeImage;
double scale = 1.0;
final Uint8List data;
if (isWindows) {
data = _image2!.getBytes(order: img2.ChannelOrder.bgra);
} else {