irisandClaude Opus 5
0522123a33
ai-server prints the QR as block characters, which take the terminal's foreground colour. On a dark-themed terminal that comes out as a photographic negative, and ZXing looks only for a dark code on a light ground, so the in-app scanner silently never matched it -- while the phone's own camera app, which tries both, did. Fixing it in the scanner rather than by having the server force its colours means however the code gets displayed stops mattering: a light terminal, a dark one, a screenshot someone inverted, a printout. MIXED_SCAN alternates normal and inverted frames, so the cost is half the frame rate at each polarity. Checked against the library's own MixedDecoder off-device: the plain decoder reads the normal image and returns nothing for the inverted one, and the mixed decoder reads both within two frames. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QQz6R4kBQcWSHBNZMgBnjL