protected virtual void RequestImage_Internal <E>(IMultiSizeImageLocator <E> locator, E size,
Func <Texture2D> loadFromDisk,
Action <Texture2D> saveToDisk,
Action <Texture2D> onSuccess,
Action <Texture2D> onFallback,
Action <WebRequestError> onError)
{
Debug.Assert(locator != null);
string url = locator.GetSizeURL(size);
// check cache and existing callbacks
if (this.TryGetCacheOrSetCallbacks(url, onSuccess, onFallback, onError))
{
return;
}
// - Start new request -
Callbacks callbacks = this.CreateCallbacksEntry(url, onSuccess, onError);
// check for fallback
callbacks.fallback = this.FindFallbackTexture(locator);
if (onFallback != null &&
callbacks.fallback != null)
{
onFallback.Invoke(callbacks.fallback);
}
// add save function to download callback
callbacks.onTextureDownloaded = saveToDisk;
// start process by checking the cache
Texture2D texture = loadFromDisk();
if (texture != null)
{
this.OnRequestSucceeded(url, texture);
}
else
{
// do the download
this.DownloadImage(url);
}
}
/// <summary>Finds a fallback texture for the given locator.</summary>
protected virtual Texture2D FindFallbackTexture <E>(IMultiSizeImageLocator <E> locator)
{
Debug.Assert(locator != null);
Texture2D fallbackTexture = null;
foreach (var pair in locator.GetAllURLs())
{
Texture2D cachedTexture = null;
E originalSize = locator.GetOriginalSize();
if (!pair.size.Equals(originalSize) &&
this.cache.TryGetValue(pair.url, out cachedTexture))
{
fallbackTexture = cachedTexture;
}
}
return(fallbackTexture);
}
/// <summary>Finds a fallback texture for the given locator.</summary>
protected virtual Texture2D FindFallbackTexture <E>(IMultiSizeImageLocator <E> locator)
{
// Debug.Assert(locator != null);
// Texture2D fallbackTexture = null;
// foreach(var pair in locator.GetAllURLs())
// {
// Texture2D cachedTexture = null;
// E originalSize = locator.GetOriginalSize();
// if(!pair.size.Equals(originalSize)
// && this.cache.TryGetValue(pair.url, out cachedTexture))
// {
// fallbackTexture = cachedTexture;
// }
// }
// return fallbackTexture;
return(null);
}
/// <summary>Handles computations for the image request.</summary>
protected virtual void RequestImage_Internal <E>(IMultiSizeImageLocator <E> locator, E size,
Func <Texture2D> loadFromDisk,
Action <Texture2D> saveToDisk,
Action <Texture2D> onSuccess,
Action <Texture2D> onFallback,
Action <WebRequestError> onError)
{
Debug.Assert(locator != null);
Debug.Assert(onSuccess != null);
// init vars
string url = locator.GetSizeURL(size);
Callbacks callbacks = null;
// check for null URL
if (string.IsNullOrEmpty(url))
{
#if UNITY_EDITOR
if (!this.excludeDownloadsFromLogs)
{
Debug.Log("[mod.io] Attempted to fetch image with a Null or Empty"
+ " url in the locator.");
}
#endif
onSuccess(null);
return;
}
// check cache
Texture2D texture = null;
if (this.cache.TryGetValue(url, out texture))
{
onSuccess(texture);
return;
}
// check currently downloading
if (this.m_callbackMap.TryGetValue(url, out callbacks))
{
// add callbacks
callbacks.succeeded.Add(onSuccess);
if (onError != null)
{
callbacks.failed.Add(onError);
}
// check for fallback
if (onFallback != null)
{
Texture2D fallback = FindFallbackTexture(locator);
if (fallback != null)
{
onFallback(fallback);
}
}
return;
}
// check disk
if (loadFromDisk != null)
{
texture = loadFromDisk();
if (texture != null)
{
this.cache.Add(url, texture);
onSuccess(texture);
return;
}
}
// create new callbacks entry
callbacks = new Callbacks()
{
succeeded = new List <Action <Texture2D> >(),
failed = new List <Action <WebRequestError> >(),
};
this.m_callbackMap.Add(url, callbacks);
// add functions
if (saveToDisk != null)
{
callbacks.succeeded.Add(saveToDisk);
}
callbacks.succeeded.Add(onSuccess);
// check for fallback
if (onFallback != null)
{
Texture2D fallback = FindFallbackTexture(locator);
if (fallback != null)
{
onFallback(fallback);
}
}
// start download
this.DownloadImage(url);
}
