fis_lib_measure/lib/view/3d_view/carotid_player.dart

import 'dart:async';
import 'dart:typed_data';
import 'package:fis_measure/interfaces/process/workspace/application.dart';
import 'package:fis_measure/interfaces/process/workspace/measure_3d_view_controller.dart';
import 'package:fis_measure/process/workspace/measure_3d_view_controller.dart';
import 'package:fis_measure/view/vid_painter/carotid_vid_painter.dart';
import 'package:flutter/material.dart' hide Image, decodeImageFromList;
import 'package:get/get.dart';
import 'package:vid/us/vid_us_image.dart';
import 'dart:ui';

class CarotidPlayer extends StatefulWidget {
  const CarotidPlayer(
    this.measure3DViewController, {
    Key? key,
  }) : super(key: key);

  final Measure3DViewController measure3DViewController;

  @override
  State<StatefulWidget> createState() => _CarotidPlayerState();
}

class _CarotidPlayerState extends State<CarotidPlayer> {
  Image? image;
  int frameIndex = 0;
  final application = Get.find<IApplication>();
  List<double> curColorFilterMatrix = <double>[
    1, 0, 0, 0, 0, // red
    0, 1, 0, 0, 0, // green
    0, 0, 1, 0, 0, // blue
    0, 0, 0, 1, 0, // alpha
  ];
  @override
  void initState() {
    final stdSize = widget.measure3DViewController.stdSize;

    ///载入虚拟frame
    application.loadFrame(
        VidUsImage(1, stdSize.width.toInt(), stdSize.height.toInt(),
            Uint8List.fromList([0])),
        false);
    application
        .loadCarotidVisuals(widget.measure3DViewController.image4Measure!);
    application.carotid2DSize = Size(
        widget.measure3DViewController.image4Measure!.width.toDouble(),
        widget.measure3DViewController.image4Measure!.height.toDouble());
    if (application.carotid2DSize.width > stdSize.width ||
        application.carotid2DSize.height > stdSize.height) {
      application.isAdaptiveCarotid2D = true;
    } else {
      application.isAdaptiveCarotid2D = false;
    }
    widget.measure3DViewController.onUpdateCarotid2DImage
        .addListener(_loadCarotidImageBytes);
    widget.measure3DViewController.updatePlayerMode.addListener(_onModeChanged);

    loadFrame(widget.measure3DViewController.image4Measure!);
    super.initState();
  }

  @override
  void dispose() {
    widget.measure3DViewController.onUpdateCarotid2DImage
        .removeListener(_loadCarotidImageBytes);
    widget.measure3DViewController.updatePlayerMode
        .removeListener(_onModeChanged);
    image?.dispose();
    super.dispose();
  }

  /// 模式改变触发更新
  void _onModeChanged(Object s, MeasureMode mode) {
    switch (mode) {
      case MeasureMode.vidMode:
        break;
      case MeasureMode.carotid2DMode:
        loadFrame(widget.measure3DViewController.image4Measure!);
        break;
      case MeasureMode.carotid3DMode:
        break;
    }
  }

  @override
  void didUpdateWidget(covariant CarotidPlayer oldWidget) {
    if (oldWidget.measure3DViewController != widget.measure3DViewController) {
      throw UnsupportedError("[VidTestPlayer] unsupport replace controller.");
    }
    super.didUpdateWidget(oldWidget);
  }

  void loadFrame(VidUsImage e) async {
    frameIndex = e.index;
    final oldImage = image;
    image = await _loadImage(e.imageData);
    oldImage?.dispose();
    setState(() {});
  }

  void _loadCarotidImageBytes(Object sender, String base64Url) async {
    image = await getImage(base64Url);
    setState(() {});
  }

  ///从base64Url获取图片
  Future<Image> getImage(String path) async {
    var completer = Completer<ImageInfo>();
    var img = NetworkImage(path);
    img
        .resolve(const ImageConfiguration())
        .addListener(ImageStreamListener((info, _) {
      completer.complete(info);
    }));
    ImageInfo imageInfo = await completer.future;
    return imageInfo.image;
  }

  Future<Image> _loadImage(Uint8List bytes) async {
    final Completer<Image> completer = Completer<Image>();
    decodeVidFromList(bytes, (Image image) => completer.complete(image));
    return completer.future;
  }

  void decodeVidFromList(Uint8List bytes, ImageDecoderCallback callback) async {
    ImmutableBuffer.fromUint8List(bytes).then((ImmutableBuffer buffer) async {
      final ImageDescriptor descriptor = await ImageDescriptor.encoded(buffer);
      descriptor.instantiateCodec().then((Codec codec) {
        final Future<FrameInfo> frameInfo = codec.getNextFrame();
        codec.dispose();
        return frameInfo;
      }).then((FrameInfo frameInfo) {
        buffer.dispose();
        descriptor.dispose();
        return callback(frameInfo.image);
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return buildBox(context, buildFrameView(context));
  }

  Widget buildBox(BuildContext context, Widget child) {
    return Container(
      alignment: Alignment.center,
      child: child,
    );
  }

  Widget buildFrameView(BuildContext context) {
    if (image != null) {
      final size = MediaQuery.of(context).size;
      return RepaintBoundary(
        child: CustomPaint(
          painter: CarotidVidPainter(
              image: image!, stdSize: widget.measure3DViewController.stdSize),
          isComplex: false, //是否为复杂图像（true会缓存）
          size: size,
        ),
      );
    } else {
      return Container();
    }
  }
}