private void SetImageToThumbnail()
{
if (file == null || hasRequestedThumbnail)
{
return;
}
LRUCache <string, Sprite> thumbnailCache = null;
thumbnailCache =
CacheManager.Instance.GetCache <string, Sprite>(THUMBNAIL_CACHE_NAME, THUMBNAIL_CACHE_CAPACITY);
if (thumbnailCache != null)
{
Sprite thumbnail = thumbnailCache.Get(file.FullName);
if (thumbnail != null)
{
SetThumbnailFromSprite(thumbnail);
hasRequestedThumbnail = true;
return;
}
}
if (IsInTransition)
{
// There was no cached thumbnail so try to load it asynchronously.
MediaHelpers.GetThumbnail(file.FullName, OnThumbnailLoaded);
hasRequestedThumbnail = true;
}
}
private void OnThumbnailLoaded(string filePath, byte[] thumbnailBytes, bool cancelled)
{
if (file == null)
{
return;
}
if (file.FullName != filePath)
{
return;
}
if (thumbnailBytes == null)
{
if (cancelled)
{
MediaHelpers.GetThumbnail(file.FullName, OnThumbnailLoaded);
}
return;
}
Texture2D thumbnail = new Texture2D(2, 2);
thumbnail.LoadImage(thumbnailBytes);
Vector2 size = imageTransform.sizeDelta;
float aspectRatio = size.x / size.y;
float width = thumbnail.width;
float height = thumbnail.height;
height = width / aspectRatio;
if (height > thumbnail.height)
{
height = thumbnail.height;
width = height * aspectRatio;
}
float rectX = (thumbnail.width * 0.5f) - (width * 0.5f);
float rectY = (thumbnail.height * 0.5f) - (height * 0.5f);
Rect rect = new Rect(rectX, rectY, width, height);
Sprite thumbnailSprite = Sprite.Create(thumbnail, rect, new Vector2(0.5f, 0.5f));
LRUCache <string, Sprite> thumbnailCache = null;
thumbnailCache =
CacheManager.Instance.GetCache <string, Sprite>(THUMBNAIL_CACHE_NAME, THUMBNAIL_CACHE_CAPACITY);
thumbnailCache.Set(file.FullName, thumbnailSprite);
SetThumbnailFromSprite(thumbnailSprite);
}