captureImage method
Implementation
Future<ByteData?> captureImage(
{required double pixelRatio, required Size size}) async {
OffscreenRenderView renderView = OffscreenRenderView(
configuration:
ViewConfiguration(devicePixelRatio: pixelRatio, size: size),
repaintBoundary: RenderRepaintBoundary(),
);
OffscreenWidgetTree widgetTree = OffscreenWidgetTree(
renderView: renderView, focusManager: FocusManager.instance);
widgetTree.attachWidget(this);
final image = await widgetTree.toImage(pixelRatio: pixelRatio);
final ByteData? byteData =
await image.toByteData(format: ui.ImageByteFormat.png);
return byteData;
}