webRtc/Assets/Script/Util/WebRTCUtil.cs

using System;
using System.Collections.Generic;
using System.IO;
using Cysharp.Threading.Tasks;
using Stary.Evo;
using UnityEngine;
using UnityEngine.UI;
using Random = UnityEngine.Random;

namespace Script.Util
{
    public static class WebRTCUtil
    {
        public static Dictionary<string, Sprite> _avatarCache = new();

        public static Color GetRandomColor()
        {
            return new Color(
                Random.Range(0.2f, 0.8f),
                Random.Range(0.2f, 0.8f),
                Random.Range(0.2f, 0.8f),
                1f
            );
        }

        public static async UniTask DownloadAndSetAvatar(string avatarUrl, Image targetImage)
        {
            try
            {
                if (_avatarCache.TryGetValue(avatarUrl, out var sprite))
                {
                    targetImage.sprite = sprite;
                    return;
                }

                var tempPath = Path.Combine(Application.temporaryCachePath, $"avatar_{Guid.NewGuid()}.png");
                var result = await WebRequestSystem.GetFile(avatarUrl, tempPath);

                if (result.code == 200)
                {
                    var bytes = File.ReadAllBytes(tempPath);
                    var texture = new Texture2D(2, 2);
                    texture.LoadImage(bytes);

                    sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height),
                        Vector2.one * 0.5f);
                    targetImage.sprite = sprite;

                    File.Delete(tempPath);
                    _avatarCache.TryAdd(avatarUrl, sprite);
                }
            }
            catch (Exception e)
            {
                Debug.LogError($"下载头像失败: {e.Message}");
            }
        }

        /// <summary>
        /// 尝试将dataUrl解码为Texture2D
        /// </summary>
        /// <param name="dataUrl"></param>
        /// <param name="tex"></param>
        /// <returns></returns>
        public static bool TryDecodeDataUrlToTexture(string dataUrl, out Texture2D tex)
        {
            tex = null;
            if (string.IsNullOrEmpty(dataUrl)) return false;
            if (!dataUrl.StartsWith("data:image/")) return false;

            var comma = dataUrl.IndexOf(',');
            if (comma < 0) return false;

            var b64 = dataUrl.Substring(comma + 1);
            var bytes = Convert.FromBase64String(b64);

            tex = new Texture2D(2, 2, TextureFormat.RGBA32, false);
            return tex.LoadImage(bytes);
        }
    }
}