A simple, runtime-dependency-free texture atlas packer.

Basic usage:

from patlas import AtlasPacker, load
from glob import glob

ap = AtlasPacker(side=2048, pad=2)
ap.pack(glob('images/*.png')) # list of images
ap.pack(['images/image.jpg']) # can call multiple times (packing quality may suffer)

ap.atlas # memoryview of RGBA texture
ap.metadata # dictionary of image locations and image format

ap.save('atlas') # serialize as custom .patlas file

atlas, metadata = load('atlas.patlas')

See demo.py for example usage with ModernGL.

Features/limitations:

• Uses stb_image, stb_rect_pack, and stb_dxt from stb
  • Can import any image format stb_image can (see here)
• Only square RGBA textures (currently)
• Optional DXT5/BC3(?) compression
  • Pass texture_format=TextureFormat.DXT5 to AtlasPacker initialization.
• Optional OpenMP support (disabled by default to reduce wheel size) can substantially reduce runtime. To enable, build from source with OMP=1 set in the environment, e.g. OMP=1 pip install patlas --no-binary patlas
  • On Windows, should "just work"?
  • MacOS may need extra packages, e.g. libomp from brew
  • Linux may need extra packages, e.g. libomp-dev on Ubuntu
• Save to a custom .patlas file
  • Uses qoi image format + zlib for fast and small encoding/decoding
  • See the save method of AtlasPacker for gory details
• Includes a command-line utility (see patlas --help for details)
• Requires Cython at build time (but source distribution should have pre-generated .c files)