napari: Error while browsing pyramid dataset

🐛 Bug

I was panning and zooming around the IDR COVID gut dataset, minding my own business, when BAM! This happened:

  File "/home/jni/miniconda3/envs/f7/lib/python3.7/site-packages/vispy/app/backends/_qt.py", line 825, in paintGL
    self._vispy_canvas.events.draw(region=None)
  File "/home/jni/miniconda3/envs/f7/lib/python3.7/site-packages/vispy/util/event.py", line 455, in __call__
    self._invoke_callback(cb, event)
  File "/home/jni/miniconda3/envs/f7/lib/python3.7/site-packages/vispy/util/event.py", line 475, in _invoke_callback
    self, cb_event=(cb, event))
  File "/home/jni/miniconda3/envs/f7/lib/python3.7/site-packages/vispy/util/event.py", line 471, in _invoke_callback
    cb(event)
  File "/home/jni/projects/napari/napari/_vispy/vispy_base_layer.py", line 246, in on_draw
    shape_threshold=self.node.canvas.size,
  File "/home/jni/projects/napari/napari/layers/base/base.py", line 692, in _update_multiscale
    self.data_level = data_level
  File "/home/jni/projects/napari/napari/layers/image/image.py", line 291, in data_level
    self.refresh()
  File "/home/jni/projects/napari/napari/layers/base/base.py", line 633, in refresh
    self.events.set_data()
  File "/home/jni/projects/napari/napari/utils/event.py", line 508, in __call__
    self._invoke_callback(cb, event)
  File "/home/jni/projects/napari/napari/utils/event.py", line 529, in _invoke_callback
    cb_event=(cb, event),
  File "/home/jni/projects/napari/napari/utils/event.py", line 523, in _invoke_callback
    cb(event)
  File "/home/jni/projects/napari/napari/_vispy/vispy_image_layer.py", line 73, in _on_data_change
    data = self.downsample_texture(data, self.MAX_TEXTURE_SIZE_2D)
  File "/home/jni/projects/napari/napari/_vispy/vispy_image_layer.py", line 167, in downsample_texture
    f"Shape of individual tiles in multiscale {data.shape} "
ValueError: Shape of individual tiles in multiscale (1, 19840) cannot exceed GL_MAX_TEXTURE_SIZE 16384. Rendering is currently in 2D mode.

To Reproduce

Steps to reproduce the behavior:

1. Download the dataset using the code below
2. Open it in napari using the next chunk of code
3. pan and zoom for a while

Honestly, I’m not clear on step 3, because everything worked great for a few minutes. I don’t know under what circumstances this error gets actually triggered.

Code to download data (courtesy of @joshmoore):

import requests
import dask.array as da
from dask.diagnostics import ProgressBar

path = 'https://s3.embassy.ebi.ac.uk/idr/zarr/v0.1/9822151.zarr'
try:
    datasets = [x['path'] for x in
                requests.get(f'{path}/.zattrs').json()["multiscales"][0]["datasets"]]
except KeyError:
    datasets = ["0"]
resolutions = [da.from_zarr(path, component=str(i)) for i in datasets]

levels = list(range(len(resolutions)))

pbar = ProgressBar()
for level, data in reversed(list(zip(levels, resolutions))):
    with pbar:
        data.to_zarr(f'/path/to/data/covid-gut/{level}.zarr')

It’s ~28GB so be prepared to wait. Took about 10h for me, most of which comes from the two highest levels.

Code to view in napari:

import napari

localres = [
    da.from_zarr(f'/path/to/data/covid-gut/{level}.zarr')
    for level in range(len(resolutions))
]

with napari.gui_qt():
    v = napari.view_image(localres)

Expected behavior

Should just keep working like it’s nothing.

Environment

napari: 0.2.12+98.g0f94ec10
Platform: Linux-4.15.0-29-generic-x86_64-with-debian-buster-sid
Python: 3.7.3 | packaged by conda-forge | (default, Jul  1 2019, 21:52:21)  [GCC 7.3.0]
Qt: 5.13.0
PyQt5: 5.13.1
NumPy: 1.18.3
SciPy: 1.3.1
Dask: 2.15.0
VisPy: 0.6.4

GL version:  3.0 Mesa 19.2.8
MAX_TEXTURE_SIZE: 16384

Plugins:
  - napari-plugin-engine: 0.1.4
  - napari-plugins: 0.1.0