feat(font): GPU derived metric fields + single-source family (Q#F6)

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The 13 compile-time metric consts become BASE_* values behind a
FontMetrics { scale, advance_ratio } carried on State: every
surface derives from one knob (size/16.0), menu_char_w and the
empty-gutter advance fallback additionally multiply the measured
selected/default advance ratio, and the Default (1.0, 1.0)
reproduces today's constants bit-for-bit -- all 69 GPU tests pass
unchanged. The compiler enumerated every use site via the BASE_*
rename; fm threads as a parameter through the free helpers
(text_area_bottom, estimated_visible_lines, minimap_height/
band_contains/y_to_line/rects, edge_scroll_direction,
mb_dropdown_window, menu_width_px). The stray Metrics::new(16.0,
22.0) literal in assemble() now derives from the same fields, and
all seven Family::Name("JetBrains Mono") literals route through
State.resolved_family (seeded from the sanitized default; the
borrow checker forced hoisted clones at set-text sites, so the
field itself is the single source rather than an accessor).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VoiEyuPjoBhvwACf8HAnLB

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Levi Neuwirth 2026-07-15 14:58:42 +01:00

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pmacs-gpu/src/main.rs

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