TapCommon-Unity/Runtime/Internal/Utils/ImageUtils.cs

46 lines
1.8 KiB
C#

using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.Networking;
namespace TapTap.Common.Internal.Utils {
public class ImageUtils {
private static Dictionary<string, WeakReference<Texture>> cachedTextures = new Dictionary<string, WeakReference<Texture>>();
public static async Task<Texture> LoadImage(string url) {
if (string.IsNullOrEmpty(url)) {
TapLogger.Warn(string.Format($"ImageUtils Fetch image is null! url is null or empty!"));
return null;
}
if (cachedTextures.TryGetValue(url, out WeakReference<Texture> refTex) &&
refTex.TryGetTarget(out Texture tex)) {
return tex;
} else {
Texture newTex = await FetchImage(url);
cachedTextures[url] = new WeakReference<Texture>(newTex);
return newTex;
}
}
public static async Task<Texture> FetchImage(string url) {
UnityWebRequest www = UnityWebRequestTexture.GetTexture(url);
UnityWebRequestAsyncOperation operation = www.SendWebRequest();
while (!operation.isDone) {
await Task.Delay(50);
}
if (www.isNetworkError || www.isHttpError) {
throw new Exception("Fetch image error.");
} else {
var texture = ((DownloadHandlerTexture)www.downloadHandler)?.texture;
if (texture == null){
TapLogger.Warn(string.Format($"ImageUtils Fetch image is null! url: {url}"));
}
return texture;
}
}
}
}