feature/cleanup-np2 (#50)

* Change README to remove plugin variant

* Use fsspec size instead of Path stat size

Author: evamaxfield

.napari/DESCRIPTION.md

@@ -21,15 +21,15 @@
 
 _While upstream `aicsimageio` is released under BSD-3 license, this plugin is released under GPLv3 license because it installs all format reader dependencies._
 
-### Plugin Variants
+### Reading Mode Threshold
 
-![screenshot of plugin sorter showing that napari-aicsimageio-in-memory should be placed above napari-aicsimageio-out-of-memory](https://raw.githubusercontent.com/AllenCellModeling/napari-aicsimageio/main/images/plugin-sorter.png)
+This image reading plugin will load the provided image directly into memory if it meets
+the following two conditions:
 
-There are two variants of this plugin that are added during installation:
+1. The filesize is less than 4GB.
+2. The filesize is less than 30% of machine memory available.
 
--   `aicsimageio-in-memory`, which reads an image fully into memory
--   `aicsimageio-out-of-memory`, which delays reading ZYX chunks until required.
-    This allows for incredibly large files to be read and displayed.
+If either of these conditions isn't met, the image is loaded in chunks only as needed.
 
 ## Examples of Features
 

README.md

@@ -36,15 +36,15 @@ _While upstream `aicsimageio` is released under BSD-3 license, this plugin is re
 **Stable Release:** `pip install napari-aicsimageio` or `conda install napari-aicsimageio -c conda-forge`<br>
 **Development Head:** `pip install git+https://github.com/AllenCellModeling/napari-aicsimageio.git`
 
-### Plugin Variants
+### Reading Mode Threshold
 
-![screenshot of plugin sorter showing that napari-aicsimageio-in-memory should be placed above napari-aicsimageio-out-of-memory](https://raw.githubusercontent.com/AllenCellModeling/napari-aicsimageio/main/images/plugin-sorter.png)
+This image reading plugin will load the provided image directly into memory if it meets
+the following two conditions:
 
-There are two variants of this plugin that are added during installation:
+1. The filesize is less than 4GB.
+2. The filesize is less than 30% of machine memory available.
 
--   `aicsimageio-in-memory`, which reads an image fully into memory
--   `aicsimageio-out-of-memory`, which delays reading ZYX chunks until required.
-    This allows for incredibly large files to be read and displayed.
+If either of these conditions isn't met, the image is loaded in chunks only as needed.
 
 ## Examples of Features
 

images/plugin-sorter.png

@@ -208,9 +208,11 @@ def reader_function(
         return None
 
     if in_memory is None:
+        from aicsimageio.utils.io_utils import pathlike_to_fs
         from psutil import virtual_memory
 
-        imsize = Path(path).stat().st_size
+        fs, path = pathlike_to_fs(path)
+        imsize = fs.size(path)
         available_mem = virtual_memory().available
         _in_memory = (
             imsize <= IN_MEM_THRESHOLD_SIZE_BYTES