ImageFiltered Render Issue #105674
Description
The scenario is like this:
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.lightBlue,
body: ListView(
controller: _controller,
children: <Widget>[
ImageFiltered(
imageFilter: ImageFilter.blur(
sigmaX: 4,
sigmaY: 4,
),
child: Container(
width: 50,
height: 50,
color: Colors.red,
),
),
Container(
height: 800,
),
],
),
);
}
this is the behavior:
2022-06-09.14.00.36.mov
The engine is the latest version.
And I found this issue may be because of Partial repaint
The second scenario is like this:
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.lightBlue,
body: SingleChildScrollView(
child: Row(
children: [ImageFiltered(
imageFilter: ImageFilter.blur(
sigmaX: 4,
sigmaY: 4,
),
child: Container(
width: 50,
height: 50,
color: Colors.red,
),
),
Container(
height: 800,
),],
),
),
);
}2022-06-09.15.45.49.mov
The second scenario and the first scenario may not be the same problem.
Because the second scenario I set the RasterCahe is nullptr, and don't use the partial repaint
// set the clip_rect is nullptr when Raster
CompositorContext::ScopedFrame::Raster() {
std::optional<SkRect> clip_rect = std::nullopt;
bool root_needs_readback = layer_tree.Preroll(
*this, ignore_raster_cache, clip_rect ? *clip_rect : kGiantRect);
....
}
// set this when preoll and paint:
PrerollContext.raster_cache = nullptr;
PaintContext.raster_cache = nullptr;