fix: avoid rendering nested HeadlessWidgets and avoid triggering re…

…render of the parent `HeadlessWidget` when a nested `HeadlessWidget` is rendered

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Upcoming
+
+- fix: avoid rendering nested `HeadlessWidget`s and avoid triggering rerender of the parent `HeadlessWidget` when a nested `HeadlessWidget` is rendered
+
 ## Version 0.10.1
 
 - chore: set dependencies for `[test]` extra

README.md

@@ -14,13 +14,10 @@ the last rendered frame.
 pip install headless-kivy
 ```
 
-To work on a non-RPi environment, run this:
+To use its test tools, you can install it with the following command:
 
 ```sh
-# pip:
 pip install headless-kivy[dev]
-# poetry:
-poetry --group dev headless-kivy
 ```
 
 ## 🛠 Usage
@@ -131,13 +128,12 @@ If set to `True`, it will flip the display vertically.
 
 ## 🤝 Contributing
 
-You need to have [Poetry](https://python-poetry.org/) installed on your machine.
+You need to have [uv](https://github.com/astral-sh/uv) installed on your machine.
 
-After having poetry, to install the required dependencies, run the following command
-in the root directory of the project:
+To install the required dependencies, run the following command in the root directory of the project:
 
 ```sh
-poetry install
+uv sync
 ```
 
 ## ⚠️ Important Note

headless_kivy/__init__.py

@@ -26,7 +26,6 @@
 from kivy.graphics.context_instructions import Color
 from kivy.graphics.fbo import Fbo
 from kivy.graphics.gl_instructions import ClearBuffers, ClearColor
-from kivy.graphics.instructions import Canvas
 from kivy.graphics.vertex_instructions import Rectangle
 from kivy.metrics import dp
 from kivy.properties import ObjectProperty
@@ -86,11 +85,9 @@ def __init__(self: HeadlessWidget, **kwargs: dict[str, object]) -> None:
         self.last_change = time.time()
         self.fps = config.max_fps()
 
-        self.canvas = Canvas()
-        with self.canvas:
-            self.fbo = Fbo(size=self.size, with_stencilbuffer=True)
-            self.fbo_color = Color(1, 1, 1, 1)
-            self.fbo_rect = Rectangle()
+        self.canvas = self.fbo = Fbo(size=self.size, with_stencilbuffer=True)
+        self.fbo_color = Color(1, 1, 1, 1)
+        self.fbo_rect = Rectangle()
 
         with self.fbo:
             ClearColor(0, 0, 0, 0)
@@ -114,28 +111,6 @@ def clear(*_: object) -> None:
         if app:
             app.bind(on_stop=clear)
 
-    def add_widget(
-        self: HeadlessWidget,
-        *args: object,
-        **kwargs: object,
-    ) -> None:
-        """Extend `Widget.add_widget` and handle `canvas`."""
-        canvas = self.canvas
-        self.canvas = self.fbo
-        super().add_widget(*args, **kwargs)
-        self.canvas = canvas
-
-    def remove_widget(
-        self: HeadlessWidget,
-        *args: object,
-        **kwargs: object,
-    ) -> None:
-        """Extend `Widget.remove_widget` and handle `canvas`."""
-        canvas = self.canvas
-        self.canvas = self.fbo
-        super().remove_widget(*args, **kwargs)
-        self.canvas = canvas
-
     def on_size(
         self: HeadlessWidget,
         _: HeadlessWidget,
@@ -269,7 +244,7 @@ def render_on_display(self: HeadlessWidget, *_: object) -> None:  # noqa: C901
         thread = Thread(
             target=config.callback(),
             kwargs={
-                'rectangle': (self.x, self.y, width, height),
+                'rectangle': (x, y, x + width - 1, y + height - 1),
                 'data': data,
                 'data_hash': data_hash,
                 'last_render_thread': last_thread,