/// <summary>
/// Gets a list of the thumbnail image ids.
/// </summary>
/// <returns>A list of the thumbnail image ids.</returns>
/// <exception cref="HeifException">Could not get all of the thumbnail image ids.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public IReadOnlyList <HeifItemId> GetThumbnailImageIds()
{
VerifyNotDisposed();
int count = LibHeifNative.heif_image_handle_get_number_of_thumbnails(this.imageHandle);
if (count == 0)
{
return(Array.Empty <HeifItemId>());
}
var ids = new HeifItemId[count];
unsafe
{
fixed(HeifItemId *ptr = ids)
{
int filledCount = LibHeifNative.heif_image_handle_get_list_of_thumbnail_IDs(this.imageHandle,
ptr,
count);
if (filledCount != count)
{
ExceptionUtil.ThrowHeifException(Resources.CannotGetAllThumbnailIds);
}
}
}
return(ids);
}
