Fix issue where the ImageRenderer's GL context wasn't released

.github/workflows/python-lint-tests.yml

@@ -27,7 +27,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Install poetry
-      run: pipx install poetry
+      run: pipx install poetry!=1.4.1
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
@@ -89,7 +89,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Install poetry
-      run: pipx install poetry
+      run: pipx install poetry!=1.4.1
     - name: Set up Python
       uses: actions/setup-python@v4
       with:

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Install poetry
-      run: pipx install poetry
+      run: pipx install poetry!=1.4.1
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
@@ -49,7 +49,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Install poetry
-        run: pipx install poetry
+        run: pipx install poetry!=1.4.1
       - name: Set up Python
         uses: actions/setup-python@v4
         with:

.readthedocs.yml

@@ -16,6 +16,6 @@ build:
     python: "3.10"
   jobs:
     post_install:
-      - pip install poetry>=1.2.1
+      - pip install poetry!=1.4.1
       - poetry config virtualenvs.create false
       - poetry install -E all --with docs

CHANGELOG.md

@@ -10,7 +10,7 @@ Release date: UNRELEASED
 
 ### Bug fixes
 
-* ...
+* Fixed issue with ImageRenderer where the GL context wasn't released, ultimately causing a crash when running the test suite (which could involve many hundreds of context creation) (#616)
 
 
 ## 1.13

pyproject.toml

@@ -74,14 +74,15 @@ types-pillow = "^9.4.0.17"
 optional = true
 
 [tool.poetry.group.docs.dependencies]
-furo = "2022.6.21"
+furo = ">=2022.12.7"
 sphinx = ">=5.0.2"
 sphinx-autobuild = ">=2021.3.14"
 sphinx-click = ">=4.3.0"
 myst_parser = ">=0.18.0"
 sphinx-autodoc-typehints= ">=1.18.3"
 sphinx-copybutton = ">=0.5.0"
 
+
 [tool.poetry.extras]
 all = ["matplotlib", "glcontext", "moderngl", "Pillow", "PySide6"]
 

vpype_viewer/image/__init__.py

@@ -28,10 +28,13 @@ def __init__(self, size: tuple[int, int]):
         Args:
             size: image size
         """
-        ctx = moderngl.create_standalone_context()
-        self._fbo = ctx.simple_framebuffer(size)
+        self._ctx = moderngl.create_context(standalone=True)
+        self._fbo = self._ctx.simple_framebuffer(size)
         self.engine = Engine()
-        self.engine.post_init(ctx, *size)
+        self.engine.post_init(self._ctx, *size)
+
+    def __del__(self):
+        self._ctx.release()
 
     def render(self) -> Image.Image:
         """Render to a :class:`PIL.Image.Image` instance.