first_time_install.sh applies patches/rpi-rgb-led-matrix/0001-bulk-setimage.patch just before building the Python binding and reverts it afterwards (and from the EXIT trap), so the submodule stays at its pinned commit. The patch copies each image row with one bulk FrameCanvas::SetPixels call and writes the bit planes branch-free: on a 512x64 Pi 4 the frame copy went from 6.57 ms to 2.21 ms. A patch that no longer applies is reported and skipped. Existing installs get it on a rebuild (RPI_RGB_FORCE_REBUILD=1).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
