I think that the thumbnails should be handled by the file browser cache (Nautilus, Dolphin, Windows file explorer, ...) instead of storing it into the LibreOffice document. Storing a thumbnail : - increases storage size (data backups, documents exchange through a network, ...) - increases cpu usage (slow downs saving/reading a file, increases energy consumption, ...)
I posted a comment to upstream Open Document File format committee : https://lists.oasis-open.org/archives/office-comment/201307/msg00000.html
The thumbnails are there for the user convenience. IMHO, it is only small part of the disk space and energy that is spent in this are these days. I mean all the windowmanager effects, complex graphics, and design. I am afraid that the world goes this ways. Regarding the disk space. It would be great if you could provide some static. It wonder how big part the thumbnail takes in normal documents in average. Regarding the cpu usage, it is questionable. In fact, the bundled thumbnail is an optimization here. It is produced only once, from already preprocessed data and then used on many systems. If it is not there and user want the thumbnails, the windowmanager would need to run LO on all systems working with the file, do the rendering and producing the thumbnail for the system cache. Again, it would be interesting to see some statistic numbers here. Jérôme, could you please provide some statistic that would support your idea?
Created attachment 82558 [details] ~30% of the compressed size is the preview of this Draw document
The storage cost depends on the usage : - the local desktop disk is often a cheap storage with possibly no backup (in enterprise for example), - the storage of a user or a group is an expensive storage (the final archived size can be multiplied by ~20 with archives rotation, humans are paid to perform the storage and check it, a long term storage use expensive technology or it requires frequent backup refresh of older backups, ...). I think that preview should be stored only on cheap storage. However a document file is usually stored on an expensive storage. Note that a document sent by email will use the network bandwidth for image preview which can be easily created by the recipient. Moreover, the document will be copied into the "inbox" folder of the recipient and also into the "sent" folder of the sender. The mailboxes of the sender and the recipient will be possibly backed up (expensive storage) and they will possibly reach their size quota. Note that there are users who never use preview image (detailed view of the Microsoft Windows file explorer for example).
I understand your arguing but I still do not see the statistic. Yes, you could create a document where the preview takes 30% of the file but is it a typical document? By a statistic, I expect result from many (>100) random real life documents. It should be a rich gallery provided by different type of users. It is not easy to get them. But if you opened this bug, I expect that you had access to some storage that included many documents. As I said, the preview was there for the user convenience. It also allows to show it without rendering the document on each user machine. Many other things are done for the user experience, e.g. formatting, pictures, animations. Could you please provide a real statistic?
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I will provide statistics within the 6 coming months.
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