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Scanning directories and loading animated images too slow #10
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Thanks for the feedback. 😃 Concerning directory searching: Since you didn't use the Using the
This is due to the fact that it identifies image files by their content (just the header, first few bytes) and not by filename extension. Concerning Loading directories in the TUI: Note: The TUI itself doesn't take time to show up, it's loading (and partially rendering) the images that takes a while. When the a directory is loaded, all files in the directory are checked and the non-images discarded. Rendering only affects partially because only the image(s) currently in view is/are rendered. I'll see what I can do about making the loading faster. Any ideas? |
Thanks for your quick answer! Here's a more precise description of the issue: I run: Checking directory '/home/user/Downloads/'...
... Done! It gets stuck here for exactly 46 secs, taking 50% of my CPU. Once it finally loads the TUI, it gets stuck there (hovering on As to recommendations to make the loading thing faster, I didn't actually look at the code, so I cannot recommend anything useful. Maybe I could take a look at it to see what could be causing this issue. EDIT: It seems to happen mostly with my |
Well, after some tests I conclude that the source of the issue is actually related to some file types. Previewing postscripts files could be a bit slow. In my case, the main obstacle was a really big GIF file (2187 frames!). I guess you could provide a command line switch to disable automatic previews for GIF files, or, even better, find a programmatic way to not automatically reproduce GIF files with more than, say, 100 frames. |
Wow! That's a lot of time... It took way less than that for the entire DCIM directory (with thousands of images) on my (not recent) android device. It seems to be an edge case like you've described. I'll try getting a sample image of that kind to test. EDIT: I suppose the file will also be really large... among the planned features is an option to specify a maximum file size which I plan to set to a reasonable default. |
As for the code responsible...
|
Whichever way you find to tackle this issue will be fine. This is a principle I follow whenever I write some new feature for my programs: no matter how cool I think it is, if it might noticeable reduce the program's performance (or somehow produce a negative impact on the user), just disable it by default and allow the user to enable it via some command line switch or option in the config file. Users get quickly disappointed and give up as soon as they experience some issue with your program, and that's something that we, as developers, need to prevent at all costs. Please let me know if you find some way to improve this loading issue. |
I really appreciate your quick reply... that's one golden principle. I'm currently looking into it. 😃 |
Any idea where I can get such a GIF? |
This is the big GIF file I was talking about: https://mega.nz/file/x4p1ma4B#PpYiUtwWFl5kUKOkyGavV9lXLuD4qsHB9uLRs1rfZvM |
Thanks |
After investigating... turned out it's actually the large number of frames that's responsible. During initialization, the number of frames is stored for subsequent use later. 👇🏾 It's getting the number of frames ( Looking up the specification of the GIF format, there's no portion of it that specifies the number of frames in the image, so it has to be determined by reading almost all through the entire image. This being the case, I don't think selecting GIFs to display based on frame count will work, since it's not possible without first determining the frame count. As for other file types... I think a "max size" option and the existing "max pixels" option should suffice. |
Concerning scanning directories to get all images in it... I'm considering some form of concurrency or parallelism where a separate thread or process preloads directories up to a certain depth (like a "look forward"). Then for the first directory or top-level (i.e containing the sources passed at the command-line), loading images could be gradual, checking the files starting with the smallest in size... and they get added to the menu/grid as they're ready. Note: I haven't implemented any of these yet, still theoretical. 😃 |
At least in the case of this huge GIF file, the size approach should work: its size is 8mb, a lot for a simple image file. However I'm not sure about what would be a sane default value for |
Hmm... True. A sane default could be difficult to come by but in the end, the user could simply change the config value. 🤷🏾♂️ |
As to the idea of gradually loading/displaying images, I guess that's a nice approach, provided the loading process runs on a separate thread and the TUI stuff on another one. The process should be as smooth as possible, even if this implies not previewing some files at all. Maybe a message in the previewing panel warning the user about the file not being displayed and allowing him/her to forcefully load the image by means of some keyboard shortcut. Just thinking aloud. |
Exactly the same thoughts here. As for the "forced load", I already implemented something similar for images above the "max pixels" so I'll simply extend that. |
Absolutely. Simple image files like PNG and JPG do not seem to cause any issue (as of now). For the time being, both GIF and postscript should be taken into account regarding max size. |
Good. I'll approach it the problem this way then. Thanks so much. |
- Fix: Eliminated delay when switching to directory entries with much image contents. - Addresses #10. - Switching between directory entries is now just as smooth as for image entries. - Add: Implemented concurrent grid scanning and update. - Added `.tui.main.scan_dir_grid()`. - Added a spearate thread "GridScanner" for scanning grid directories. - Change: `update_pipe` file descriptor is now exported to `.tui.main` and used from the module namespace. - Change: Moved `update_screen()` from within `.tui.main.scan_dir_menu()` to the module scope to avoid code replication. - Change: The directory is now scanned, and the grid updated, concurrently. - Updated `.tui.main.display_images()` to work with GridScanner. - Grid cells are added gradually, though quickly. - The grid is now always scanned afresh whenever the switching to a directory entry, even if the path is the same as that of the last grid. - This is to allow for smooth switching between directory entries, as initializing a grid from a previous scan result all at once will result in delays for large grids. - Change: Menu listing speed-up. - When opening a directory entry, the menu list is initialized using the contents already scanned for the grid. - If the scanning is not yet done, the MenuScanner thread picks up from where it stopped. - Change: `.tui.main.display_images()` now uses `content["/"]` to determine the emptiness of a directory's grid. - Change: Updated `GridLisBox` re-rendering process. - The focus positions are now transffered as long as the grid direcory path is the same, even if the number of cells is different. - Ensure the focus position is not lost when a new cell is added by GridScanner. - Change: Updated grid cell render caching. - Grid cell canvases are now cached using the name of the image in the cell instead of the image instance since: - all names in the same directory must be unique. - it supports the new grid directory scanning approach where a grid is always scanned afresh. - Change: Updated docstrings and comments.
- Change: Increased fuildity and responsiveness when switching menus. - Futher adresses #10. - Change: Eliminated unnecessary waits/blocks. - Removed while loop blocks and replaced with `Event.wait()` where applicable. - Change: MenuScanner is now a daemon thread. - Eliminates the need for `interrupted` and `quitting` event status checks while scanning. - Change: Re-organized top-level assignments in `.tui.main`. - Change: Updated comments.
- Change: Caching of animated image frames in the TUI is now based on image file size instead of frame count. - Adresses #10. NOTE: This change is temporary and will be reverted as soon as a Pillow version including the improvements in python-pillow/Pillow#6077 is released.
Hello @leo-arch ! It's definitely been a while 😃 but the good news is... time hasn't passed in vain. Here is an highlight of the performance-related fixes and improvements I've implemented since, as regards this issue: For the library:
For the CLI:
For the TUI:
Footnotes
If you don't mind, please update your installation from the main branch to test the changes. I'll gladly appreciate your feedback. Thanks 😃 |
In addition to these... I'll also be implementing the following before releasing 0.2.0:
|
Hey @AnonymouX47! Sorry for the delay. It's much better now! Congrats and thanks! I really like this. I guess PIL internally uses something along the lines of cacalib or chafa (i.e., ASCII/ANSI rendering). Do you plan to add support for ueberzug, w3img, sixel or kitty? These protocols are really good at displaying images on the terminal, and besides they are more and more widely adopted. I myself implemented a files previewer (not only images, but also PDF, document, postscript files, and even sound files) using fzf and ueberzug for my CliFM, but only as a plugin (a shell script indeed): it's nice and all, but far from ideal. A third party utility able to do this smoothly, and able to be integrated into CliFM, would be really nice. And Keep up the good work! |
Great, happy to hear this!
Oh, no. PIL only decodes the images, the rendering is implemented here in
Another developer using the library also suggested the likes of this. Though before any of these will be implemented, a major API change is required as regards the sizing unit (See #16).
Yeah, I did check it out 😃... Great work 👍
True, I'll put more work into it. 😃 Thanks so much, I really appreciate your feedback and suggestions... would love to see more of that. I'll update you on the protocol support issue as I progress. |
Thanks! That would be great. |
Description
First of all, great work. I'm really interested on it. Now, everything goes fine when you open a single file or several files using a glob expression (e.g.
~/Downloads/*.png
). However, whenever you want to browse a directory, it takes too long (like 20 secs or more) to load the TUI viewer (while recursively scanning image files in the given directory). Once the TUI finally loads, it is also a bit slow whenever you hover a directory (a few seconds depending on the directory).To Reproduce
term-img DIR
orterm-img DIR/*
Expected behavior
term-img
should be quicker and smoother when recursively browsing directoriesDesktop:
Package info:
pip install
Terminal Emulator:
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