flutter-plugins/packages/embedder_texture/lib/embedder_texture.dart

import 'package:flutter/material.dart';

import 'embedder_texture_platform_interface.dart';

class EmbedderTexture extends StatefulWidget {
  const EmbedderTexture({
    super.key,
    required this.width,
    required this.height,
  });

  final double width;
  final double height;

  @override
  State<EmbedderTexture> createState() => _EmbedderTextureState();
}

class _EmbedderTextureState extends State<EmbedderTexture> {
  int _textureID = 0;
  int _camera_width = 0;
  int _camera_height = 0;

  @override
  initState() {
    super.initState();
    EmbedderTexturePlatform.instance
        .create(widget.width, widget.height)
        .then((data) => setState(() {
      if (mounted) {
        _textureID = data['textureId']!;
        _camera_width = data['width']!;
        _camera_height = data['height']!;
        debugPrint(_textureID.toString());
      }
    }));
  }

  @override
  void dispose() {
    super.dispose();
    EmbedderTexturePlatform.instance.remove(_textureID);
  }

  @override
  Widget build(BuildContext context) {
    if (_textureID != 0) {

      double w = 0;
      double h = 0;

      if (MediaQuery.of(context).orientation == Orientation.portrait) {
        w = _camera_width * widget.height / (widget.width - 40);
        h = widget.width - 40;
      } else {
        w = _camera_height.toDouble();
        h = widget.height - 40 - 56;
      }

      return Container(
        color: Colors.black,
        width: widget.width,
        height: widget.height,
        child: Center(
            child: RotationTransition(
              turns: AlwaysStoppedAnimation(MediaQuery.of(context).orientation == Orientation.portrait ? 90 / 360 : 0),
              child: SizedBox(
                  width: w,
                  height: h,
                  child: Texture(textureId: _textureID)
              ),
            )
        ),
      );
    }
    return const SizedBox.shrink();
  }
}