v0.4.0

What's changed

• Switch to crunch-rs rectangle-packing library
• Added --minify-index-file CLI flag to remove optional whitespace from the JSON-formatted index file

Full changelog: v0.3.0...v0.4.0

New rectangle-packing library

By chance I discovered Chevy Ray Johnston's crunch-rs rectangle-packing library. I experimented with it and found that it's faster than the previous library I was using, rectangle-pack, and it produces smaller spritesheets (total pixels and file size). From version 0.4.0, Spreet uses crunch-rs to pack sprites into spritesheets. Some benchmarks are below.

Change in total pixels

Map style	Spritezero pixels	Spreet (rectangle-pack) pixels	Spreet (crunch-rs)
osm-bright-gl-style	208,810	150,540 (-28%)	130,048 (-38%)
openstreetmap-americana	577,548	638,392 (+11%)	389,640 (-33%)
mapbox-gl-styles (basic)	271,488	348,100 (+28%)	258,064 (-5%)
mapbox-gl-whaam-style	90,944	69,696 (-23%)	59,136 (-35%)

Change in file size

Map style	Spritezero file size	Spreet (rectangle-pack) file size	Spreet (crunch-rs) file size
osm-bright-gl-style	43,860	27,124 (-38%)	25,962 (-41%)
openstreetmap-americana	140,401	82,462 (-41%)	80,899 (-42%)
mapbox-gl-styles (basic)	76,383	43,961 (-42%)	41,546 (-46%)
mapbox-gl-whaam-style	17,342	5,423 (-69%)	5,341 (-69%)