ioistired / xbrz.py

ctypes-based binding library for the xBRZ pixel art image scaling algorithm

xbrz.py

xbrz.py is a simple ctypes-based binding library for xBRZ, a high-quality pixel-art image scaling algorithm.

Installation

Wheels are available for many platforms. If there isn't one for your platform, make sure you have a C++ compiler handy.

pip install xbrz.py

Usage

import xbrz

# pixels is a list of 32 bit ints representing RGBA colors.
# It is 32 * 24 long.
pixels = ...
scaled_pixels = xbrz.scale(pixels, 6, 32, 24, xbrz.ColorFormat.RGBA)

# scaled_pixels is a 32 * 24 * 6 ** 2 long list of 32 bit ints representing the scaled image.

Wand / Pillow support

You can pass a Wand image to xbrz.scale_wand(img, factor) or a Pillow image to xbrz.scale_pillow(img, factor). Neither libraries are required to use xbrz.py, however they can be installed via:

pip install xbrz.py[wand]
# or
pip install xbrz.py[pillow]

xbrz.py as an executable module

Passing raw RGBA pixels to python3 -m xbrz <factor> <width> <height> via stdin will output scaled raw RGBA pixels to stdout.

License

AGPLv3, see LICENSE.md. The original xBRZ code is GPLv3 licensed.

• lib/ is based on code provided by Zenju under the GPLv3 license. See lib/License.txt for details. Some changes were made:
  • Added some extern "C" declarations to the functions I intended to call from python.
  • Removed some namespace use to avoid being mangled.
  • Replaced a C++ template with a simple function that takes two arguments.
  • Converted the library to use RGBA instead of ARGB.
• xbrz.py is based on lib/ and is released under the AGPLv3 license, see LICENSE.md for details.