FSlateTextureDataPtr FTileThumbnail::UpdateThumbnail()
{
// No need images for persistent and always loaded levels
if (TileModel.IsPersistent())
{
return ToSlateTextureData(nullptr);
}
// Load image from a package header
if (!TileModel.IsVisible() || TileModel.IsSimulating())
{
const FName LevelAssetName = TileModel.GetAssetName();
TSet<FName> ObjectFullNames;
ObjectFullNames.Add(LevelAssetName);
FThumbnailMap ThumbnailMap;
if (ThumbnailTools::ConditionallyLoadThumbnailsFromPackage(TileModel.GetPackageFileName(), ObjectFullNames, ThumbnailMap))
{
const FObjectThumbnail* ObjectThumbnail = ThumbnailMap.Find(LevelAssetName);
return ToSlateTextureData(ObjectThumbnail);
}
}
// Render image from a visible level
else
{
ULevel* TargetLevel = TileModel.GetLevelObject();
if (TargetLevel)
{
FIntPoint RTSize = ThumbnailRenderTarget->GetSizeXY();
// Set persistent world package as transient to avoid package dirtying during thumbnail rendering
FUnmodifiableObject ImmuneWorld(TargetLevel->OwningWorld);
FObjectThumbnail NewThumbnail;
// Generate the thumbnail
ThumbnailTools::RenderThumbnail(
TargetLevel,
RTSize.X,
RTSize.Y,
ThumbnailTools::EThumbnailTextureFlushMode::NeverFlush,
ThumbnailRenderTarget,
&NewThumbnail
);
UPackage* MyOutermostPackage = CastChecked<UPackage>(TargetLevel->GetOutermost());
ThumbnailTools::CacheThumbnail(TileModel.GetAssetName().ToString(), &NewThumbnail, MyOutermostPackage);
return ToSlateTextureData(&NewThumbnail);
}
}
return ToSlateTextureData(nullptr);
}
void FContentBrowserSingleton::OnObjectPropertyChanged(UObject* ObjectBeingModified)
{
if ( !ensure(ObjectBeingModified) )
{
return;
}
if ( ObjectBeingModified->HasAnyFlags(RF_ClassDefaultObject) && ObjectBeingModified->GetClass()->ClassGeneratedBy != NULL )
{
// This is a CDO for a blueprint. Pretend the blueprint changed instead.
ObjectBeingModified = ObjectBeingModified->GetClass()->ClassGeneratedBy;
}
if ( ObjectBeingModified->IsAsset() )
{
// An object in memory was modified. We'll mark it's thumbnail as dirty so that it'll be
// regenerated on demand later. (Before being displayed in the browser, or package saves, etc.)
FObjectThumbnail* Thumbnail = ThumbnailTools::GetThumbnailForObject( ObjectBeingModified );
if ( Thumbnail == NULL )
{
// If we don't yet have a thumbnail map, load one from disk if possible
FName ObjectFullName = FName(*ObjectBeingModified->GetFullName());
TArray<FName> ObjectFullNames;
FThumbnailMap LoadedThumbnails;
ObjectFullNames.Add( ObjectFullName );
if ( ThumbnailTools::ConditionallyLoadThumbnailsForObjects( ObjectFullNames, LoadedThumbnails ) )
{
Thumbnail = LoadedThumbnails.Find(ObjectFullName);
if ( Thumbnail != NULL )
{
Thumbnail = ThumbnailTools::CacheThumbnail(ObjectBeingModified->GetFullName(), Thumbnail, ObjectBeingModified->GetOutermost());
}
}
}
if( Thumbnail != NULL )
{
// Mark the thumbnail as dirty
Thumbnail->MarkAsDirty();
}
}
}
