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wrap glfw init to avoid warnings in headless mode and display animated gif #58

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Merged
m-reuter merged 1 commit into from
Feb 25, 2026
Merged

wrap glfw init to avoid warnings in headless mode and display animated gif #58

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2 changes: 1 addition & 1 deletion tutorials/whippersnappy_tutorial.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -286,7 +286,7 @@
},
"outputs": [],
"source": [
"Image(filename=outpath_gif)\n"
"display(Image(filename=outpath_gif))\n"
]
}
],
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7 changes: 5 additions & 2 deletions whippersnappy/gl/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
import logging
import os
import sys
import warnings
from typing import Any

import glfw
Expand Down Expand Up @@ -181,8 +182,10 @@ def init_window(width, height, title="PyOpenGL", visible=True):
window or False
GLFW window handle on success, or False on failure.
"""
if not glfw.init():
return False
with warnings.catch_warnings():
warnings.simplefilter("ignore")
if not glfw.init():
return False

glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 3)
glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 3)
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23 changes: 13 additions & 10 deletions whippersnappy/snap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import logging
import os
import warnings

import glfw
import numpy as np
Expand Down Expand Up @@ -151,16 +152,18 @@ def snap1(
ref_height = 500
ui_scale = min(width / ref_width, height / ref_height)
try:
if glfw.init():
primary_monitor = glfw.get_primary_monitor()
if primary_monitor:
mode = glfw.get_video_mode(primary_monitor)
if width > mode.size.width:
logger.info("Requested width %d exceeds screen width %d, expect black bars",
width, mode.size.width)
elif height > mode.size.height:
logger.info("Requested height %d exceeds screen height %d, expect black bars",
height, mode.size.height)
with warnings.catch_warnings():
warnings.simplefilter("ignore")
if glfw.init():
primary_monitor = glfw.get_primary_monitor()
if primary_monitor:
mode = glfw.get_video_mode(primary_monitor)
if width > mode.size.width:
logger.info("Requested width %d exceeds screen width %d, expect black bars",
width, mode.size.width)
elif height > mode.size.height:
logger.info("Requested height %d exceeds screen height %d, expect black bars",
height, mode.size.height)
except Exception:
pass # headless — no monitor info available, that's fine

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