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Jake WriterandD Yiapanis
d6a806e2b5
BrowserForge picks navigator/screen; the GPU is drawn separately from webgl_data.db weighted only by OS. Nothing ties the two together, so the synthetic path emits pairs no real machine ships -- a discrete desktop GPU behind a 1024x600 panel. Consistency checks (Pixelscan, Fingerprint.com) read that as masking even though every individual value is plausible on its own. Builds on @dyiapanis's #730, which identified the problem and the GPU-class thresholds, with three changes: * Constrain the GPU to the screen rather than the screen to the GPU. sample_webgl_for_screen does rejection sampling, so the GPU keeps webgl_data.db's real OS-weighted distribution and the geometry -- already reconciled against the real display and the window box by clamp_screen_to_display / fix_screen_no_taskbar / clamp_window_dimensions / clamp_window_position -- is left alone. * Where no coherent GPU exists at all (BrowserForge still carries netbook-era geometry, and nothing in the pool drives a sub-1366x768 panel), raise_screen_to_gpu_floor lifts the screen instead. It measures the screen-to-avail gap BEFORE mutating -- #730 computed it after overwriting screen.height, which turned a 1024x600 -> 1080 bump into a 520px "taskbar", a fresh impossible-geometry tell -- and it runs BEFORE clamp_screen_to_display so a genuinely small monitor still wins and a headful window cannot be pushed back off its own display (#499). * No Apple-M Retina floor. Apple silicon also ships in the Mac mini and Mac Studio, which drive whatever external monitor is attached, so pinning it to 2560x1600 would reject real hardware and shrink the pool for nothing. Measured over 300 synthetic fingerprints, incoherent GPU/screen pairs fall from 54.3% to 0%, with avail <= screen and availHeight < height holding in every trial. The screen floor is a no-op for the Linux and Windows pools (0/400 draws below it) and fires on 3.5% of macOS draws, so the entropy cost is confined to the implausible tail it exists to remove. Co-authored-by: D Yiapanis <d@yiapanis.co>