nx_font_bitmap_5x7.nx

nx_font_bitmap_5x7.nx -- 5x7 bitmap font for the Nishi browser. Phase 4 fifth primitive of NISHI_BROWSER_ROADMAP. Provides per-row glyph bit patterns; nx_paint_text (next primitive, queued) consumes these and rasterizes characters into a Framebuffer. Glyph layout: each glyph is 5 columns wide x 7 rows tall. One row is encoded as a single byte where the LOW 5 bits are the pixel pattern, LEFTMOST pixel = bit 4 (0x10), RIGHTMOST = bit 0 (0x01). Each glyph occupies 7 consecutive bytes in the font table. Initial subset (12 glyphs, 84 bytes of font data): ' ' (ASCII 32) -- space, all zero rows '0'..'9' (ASCII 48..57) -- digits '.' (ASCII 46) -- period Lookup contract: nx_font_5x7_glyph_row(ascii_char, row_idx) -> i64 ascii_char: byte value 0..255 row_idx: 0..6 (top to bottom) returns: low 5 bits = pixel pattern, -1 for unsupported char or row_idx out of range. Now covers: space, digits 0-9, A-Z, a-z, and common punctuation . , - : ; / ( ) ' " ! ? % + = (added for prose readability). What it does NOT handle yet (Phase 4b queued, explicit in header): - Remaining punctuation/symbols: # $ * @ [ ] { } < > \ | ~ ^ _ ` - Variable-width glyphs (current is fixed 5x7 cell) - Kerning pairs - Anti-aliasing (current is 1-bit-per-pixel) - Multi-byte encodings (UTF-8, Latin-1) - Synthetic bold / italic emphasis Per cardinal feedback-honest-perf-verdict-no-aspirational-claims: gap list is EXACT in this header. Glyph designs follow the classic IBM CGA 5x7 pattern (public- domain bitmap fonts derived from the original IBM PC ROM, e.g. the U+VT100, DOS-CGA, and Code Page 437 8x8 fonts).