blackrenderer 0.1.0

A Python-based renderer for OpenType COLRv1 fonts, with multiple backends.

BlackRenderer

Developing a Python-based renderer for OpenType COLRv1 fonts, with multiple backends.

Goals

• Use fonttools to parse COLRv1 data
• Adapter classes for various 2D rendering back-ends:
  1. Debugging/printing (text dump of scene graph / 2D API calls)
  2. skia-python
  3. pycairo
  4. SVG
  5. CoreGraphics (macOS)
  6. ...
• hb-view-like command line app with switchable backend

Usage

BlackRenderer comes with an hb-view-like command line tool, that can be used like this:

$ blackrenderer font.ttf ABC🤩 output.png --font-size=100

Install / Setting up an environment

Have Python 3.7 or higher installed.

Open Terminal.

"cd" into the project repo directory.

Create a virtual environment:

• $ python3 -m venv venv --prompt=black-renderer

Activate the venv:

• $ source venv/bin/activate

(You need to activate the virtual environment for every new terminal session.)

Upgrade pip:

• $ pip install --upgrade pip

Install the requirements:

• $ pip install -r requirements.txt
• $ pip install -r requirements-dev.txt

Install blackrenderer in editable mode:

• $ pip install -e .

Run the tests:

• $ pytest