nx_paint_text.nx

nx_paint_text.nx -- rasterize an ASCII text string into a Framebuffer using nx_font_bitmap_5x7. Phase 4 sixth primitive of NISHI_BROWSER_ROADMAP. First text-rendering primitive of the bits-up browser substrate. Algorithm: For each char in the text string, lookup its 7 row bit patterns from nx_font_bitmap_5x7, then for each row scan the 5 columns and set a pixel for each "on" bit. Cell stride: 6 columns per character (5 glyph + 1 inter-char space). Vertical advance: 0 (single line; nx_paint_text_lines queued for wrapping). Pixels are written via direct framebuffer access; bounds-checked per pixel (pixels off-screen are silently skipped). For sub-pixel-aware AA glyph edges, use nx_paint_text_aa (queued). What it does NOT handle yet (Phase 4b queued, explicit in header): - line wrapping (caller's responsibility for now) - vertical line advance for multi-line text - Unicode beyond ASCII (multi-byte UTF-8 decode) - kerning pairs / proportional spacing (current is fixed cell) - bold / italic / underline emphasis - text-align / text-decoration CSS support - anti-aliased glyph edges (current 1-bit-per-pixel) - scale != 1x (would need block-fill per pixel; Phase 4c) Per cardinal feedback-honest-perf-verdict-no-aspirational-claims: gap list is EXACT in this header. genealogy_id: classical_bitmap_font_rasterizer + substrate_browser_phase_4_text lineage_id: nishi_browser_paint_text_v1