starkernel: retarget REPL glyph rendering to TTF-TEXT's rasterizer (4.4j)

font_8x16.c keeps rendering everything through and including POST;
TTF-TEXT's rasterizer takes over at the interactive REPL boundary
(sk_repl()) via a new runtime mode switch, vt100_enable_ttf()
(console_fb_enable_ttf() wrapper), not a compile-time swap -- both
backends coexist in the same binary since boot/POST must stay
font_8x16.c per this item's own done-when.

TTF-TEXT (the FORTH word) isn't directly callable from vt100.c -- VM
stack arguments, different call shape than a one-glyph cell draw. Used
hal/ttf.c's VM-independent primitives directly instead (same rasterizer
TTF-TEXT itself calls underneath), added as a native C helper in
vt100.c. Lazily loads fonts:JetBrainsMono-Regular.ttf and kmallocs a
96-slot raster cache (covers all 95 printable ASCII, no eviction
thrash) on first switch.

Cell geometry changes at the switch (mode-aware cell_w()/cell_h()):
provisional 12x24 TTF cell (600/1000em * 20px = 12px exactly, using
4.4i's confirmed-uniform hmtx advance width) vs font_8x16's fixed 8x16
-- cols/rows re-derived and screen cleared at the switch point, same as
vt100_init() itself does. Final REPL text size is 4.4m's decision, not
this item's.

Also fixes the second call site 4.4i flagged: erase_line_range() now
uses one fb_fill_rect() instead of a per-cell font_8x16-specific blank
glyph draw, consistent with erase_display(2)'s full-screen case.

Three-arch verified: amd64/aarch64/riscv64 all reach ok>, POST
Failed: 0, identical dict-hashes. amd64 screendump shows real
proportional JetBrains Mono letterforms on the REPL tail, visibly
distinct from every prior font_8x16 screenshot.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

FABRIC.md

@@ -5306,7 +5306,7 @@ document and committing that amendment as its own item.*
   > `draw_cursor_glyph()`'s call, `erase_line_range()`'s call, and the `fb_cell_w()`/
   > `fb_cell_h()`/`UNDERLINE_ROW` metrics that currently assume `font_8x16` specifically.
 
-- [ ] **4.4j — Retarget the glyph-draw call site from `font_8x16.c` to `TTF-TEXT`.** Depends
+- [x] **4.4j — Retarget the glyph-draw call site from `font_8x16.c` to `TTF-TEXT`.** Depends
   on 4.4i. **Boundary, corrected 2026-08-11:** `font_8x16.c`/VT100 keeps rendering everything
   through and including **POST** (the parity/dictionary-hash self-test) — not just the
   pre-bootstrap M1–M6 messages originally scoped here. POST runs *after* the capsule/VM system
@@ -5328,6 +5328,76 @@ document and committing that amendment as its own item.*
   > preference"). The actual early-boot/POST fallback is `font_8x16.c` specifically, not "the
   > stroke font" generically.
 
+  > **Done 2026-08-11.** `TTF-TEXT` (the FORTH word, `word_source/ttf_words.c`) turned out not
+  > to be directly callable from `vt100.c` — it takes VM-stack arguments and a
+  > string+advance-loop, a different call shape than a one-glyph-at-a-time cell draw.
+  > `hal/ttf.c`'s primitives underneath it (`ttf_load_from_capsule`, `ttf_raster_cache_get`,
+  > etc.) are VM-independent, though, exactly like `font_8x16.c`'s own C functions — so
+  > "retarget to TTF-TEXT" means "retarget to the same rasterizer TTF-TEXT itself uses",
+  > implemented as a native C helper in `vt100.c`, not a call into the FORTH word. Recording
+  > this now so it isn't read later as scope drift.
+  >
+  > **Boundary implemented as a runtime switch, not a compile-time swap** (this item's own
+  > done-when requires boot/POST to stay `font_8x16.c` while REPL output uses TTF — both must
+  > coexist in the same binary). New `vt100_enable_ttf()` (`vt100.c`, wrapped by
+  > `console_fb_enable_ttf()` in `console.c`) flips a mode flag; `draw_cursor_glyph()` and
+  > `erase_line_range()` branch on it. Called exactly once, at the top of `sk_repl()`
+  > (`repl.c`) — the actual start of "the interactive REPL itself", after boot/POST have both
+  > already run under `font_8x16.c`. Lazily loads `fonts:JetBrainsMono-Regular.ttf` from its
+  > capsule and `kmalloc`s a 96-slot raster cache (up from `ttf_words.c`'s 32 — sized to cover
+  > all 95 printable ASCII with no eviction thrash, since a terminal cycles through that whole
+  > set constantly; ~614 KB, checked against the 2 GiB kmalloc heap default before choosing it,
+  > trivial by comparison) on first call only.
+  >
+  > **Cell geometry changes at the switch, deliberately (advisor-reviewed option (a), not
+  > (b)):** `cell_w()`/`cell_h()` are now mode-aware — `font_8x16`'s fixed 8×16 in bitmap mode,
+  > a provisional 12×24 in TTF mode (`600/1000 × 20px = 12px` exactly, using 4.4i's own
+  > confirmed-uniform `hmtx` advance width so the fixed-cell grid tiles cleanly; final REPL
+  > text size is 4.4m's decision, not this item's — marked provisional throughout). Since the
+  > grid changes, `vt100_enable_ttf()` re-derives `cols`/`rows` from the new cell size and
+  > clears the screen, the same as `vt100_init()` itself does — safe because this runs once, at
+  > a point where nothing worth preserving is on screen yet.
+  >
+  > **Also fixed the second call site 4.4i flagged**, not just `draw_cursor_glyph()`'s:
+  > `erase_line_range()` no longer draws a per-cell blank glyph (`font_8x16`-specific, and
+  > already inconsistent with `erase_display(2)`'s full-screen case, which used a plain rect
+  > fill). A blank cell is visually identical to a filled background rect regardless of glyph
+  > backend, so it's now one `fb_fill_rect()` call for the whole erased range — simpler *and*
+  > mode-independent, closing 4.4i's inconsistency finding rather than carrying it forward.
+  >
+  > Underline positioning (the third 4.4i finding, `UNDERLINE_ROW` hardcoding "row 14 of 16")
+  > is branched per-mode: unchanged in bitmap mode, placed 2px below the TTF baseline in TTF
+  > mode — no equivalent fixed row exists there since this parser doesn't read `hhea`
+  > underline metrics (`ttf.h`), so this is provisional too.
+  >
+  > **Three-arch verified:** amd64 (`logs/20260811-194937/amd64/`), aarch64
+  > (`logs/20260811-195246/aarch64/`), riscv64 (`logs/20260811-195446/riscv64/`) — all reach
+  > `ok>`, POST `Failed: 0`, identical dict-hashes across all three (confirming the TTF switch,
+  > which only runs after POST, has no effect on the parity-hashed dictionary state). amd64
+  > screendump, full and zoomed on the REPL tail:
+  > [evidence/amd64/qemu-screenshot-20260811-195041-4.4j-ttf-repl.png](evidence/amd64/qemu-screenshot-20260811-195041-4.4j-ttf-repl.png),
+  > [evidence/amd64/qemu-screenshot-20260811-195041-4.4j-ttf-repl-zoom.png](evidence/amd64/qemu-screenshot-20260811-195041-4.4j-ttf-repl-zoom.png)
+  > — real proportional JetBrains Mono letterforms on the version banner, CLI banner, and
+  > `ok>` prompt, visibly distinct from every prior screenshot's blocky bitmap font; `[Hera]`
+  > stays orange, `ok>` stays cyan (4.4h unaffected). Boot/POST (everything above the visible
+  > tail) is unchanged `font_8x16.c` output, confirmed by this same screendump showing nothing
+  > else on screen — `erase_display(2)` at the switch point cleared it, same behavior as every
+  > screenshot since 4.4c.
+  >
+  > **Known, pre-existing, not touched here:** the mangled `â[box][box]` where an em-dash
+  > should read (`"FORTH-79 interpreter — type BYE..."`) is `vt100_putc()`'s byte-oriented
+  > pipeline treating each byte of the UTF-8 em-dash as its own codepoint — `TTF-TEXT`'s own
+  > word decodes UTF-8 (`ttf_words_decode_utf8()`), but `vt100.c`'s character path never did,
+  > in *either* glyph mode. Confirmed pre-existing by checking earlier font_8x16-mode
+  > screenshots (4.4f/4.4h): the same line already rendered wrong there too (garbled as "tgpe
+  > BYE" etc.) — not a 4.4j regression, a longstanding gap in `vt100.c` unrelated to which font
+  > backend draws the (wrong) glyph.
+  >
+  > **CANVAS scroll-box text**, per this item's original done-when: 4.4n/4.4o build that box as
+  > separate, later items — this item's job was making sure the *same* TTF renderer will serve
+  > it once it exists, not building the box itself. No box exists yet, so this is deferred by
+  > construction, not skipped.
+
 - [ ] **4.4k — Live-verify ANSI color end-to-end.** Depends on 4.4j. Inject an SGR color
   escape sequence (`ESC[3xm`/`ESC[9xm`/256-color) over serial and confirm it visibly changes
   `TTF-TEXT`-rendered glyph color in a screendump — the parser and the retargeted draw call

experiments/bare_metal/latest/aarch64.csv

@@ -72,39 +72,39 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
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experiments/bare_metal/latest/amd64.csv

@@ -74,37 +74,37 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
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include/starkernel/console.h

@@ -71,6 +71,17 @@ void console_init(void);
 #include "framebuffer.h"
 void console_fb_init(const FramebufferInfo *info, FbPixelFormat fmt);
 
+/**
+ * FABRIC.md item 4.4j: switch the framebuffer console's glyph backend from
+ * font_8x16.c to TTF-TEXT's rasterizer. Thin wrapper over
+ * vt100_enable_ttf() -- see that function's doc comment for the full
+ * contract (lazy font load, cell-geometry/cols/rows recompute, screen
+ * clear, one-shot). No-op if the framebuffer console was never
+ * initialized (console_fb_init() not called, or it no-op'd on a NULL
+ * framebuffer).
+ */
+void console_fb_enable_ttf(void);
+
 /**
  * Write a single character to serial console
  */

include/starkernel/vt100.h

@@ -60,6 +60,19 @@
  */
 void vt100_init(void);
 
+/**
+ * FABRIC.md item 4.4j: switch the glyph-draw backend from font_8x16.c to
+ * TTF-TEXT's rasterizer for everything drawn from this call onward --
+ * boot/POST output before this call stays font_8x16.c, unaffected.
+ * Lazily loads the font capsule and its raster cache on first call
+ * (no-op on later calls). Recomputes cols/rows for the new cell size and
+ * clears the screen, since the two glyph backends use different cell
+ * dimensions. Provisional TTF point size/cell dimensions -- FABRIC.md
+ * item 4.4m owns the final decision. No-op if the font capsule fails to
+ * load (stays on font_8x16.c; logged, not fatal).
+ */
+void vt100_enable_ttf(void);
+
 /* -----------------------------------------------------------------------
  * Character output
  * --------------------------------------------------------------------- */

src/starkernel/hal/console.c

@@ -296,6 +296,13 @@ void console_fb_init(const FramebufferInfo *info, FbPixelFormat fmt)
     }
 }
 
+void console_fb_enable_ttf(void)
+{
+    if (fb_is_available()) {
+        vt100_enable_ttf();
+    }
+}
+
 /**
  * Read a single character from serial console (non-blocking)
  * Returns -1 if no character available

src/starkernel/hal/vt100.c

@@ -40,14 +40,47 @@
 
 #include "vt100.h"
 #include "framebuffer.h"
+#include "starkernel/ttf.h"
+#include "starkernel/capsule_generated.h"
+#include "starkernel/kmalloc.h"
+#include "log.h"
 #include <stdint.h>
 
 /* Maximum CSI parameters */
 #define VT100_MAX_PARAMS 16
 
-/* Underline scanline (row 14 of 16) */
+/* Underline scanline (row 14 of 16) -- font_8x16 mode only; see
+ * draw_cursor_glyph()'s mode split. */
 #define UNDERLINE_ROW 14u
 
+/* -----------------------------------------------------------------------
+ * FABRIC.md item 4.4j: TTF glyph backend, active only from
+ * vt100_enable_ttf() onward (boot/POST stays font_8x16.c).
+ *
+ * Provisional point size and cell geometry -- item 4.4m owns the final
+ * REPL-strip decision. Chosen so 4.4i's confirmed hmtx result (all
+ * printable ASCII share one 600/1000-em advance width) divides evenly:
+ * 600/1000 * 20 = 12px exactly, no fractional-pixel cell width. Cell
+ * height is size + a fixed descender/leading allowance, not derived from
+ * hhea (not read by this parser -- see ttf.h) -- provisional like the
+ * width.
+ * --------------------------------------------------------------------- */
+#define VT100_TTF_SIZE_PX     20u
+#define VT100_TTF_CELL_W_PX   12u  /* 600/1000 * VT100_TTF_SIZE_PX */
+#define VT100_TTF_CELL_H_PX   24u  /* provisional: size + 4px leading/descender */
+#define VT100_TTF_CACHE_SLOTS 96u  /* covers all 95 printable ASCII, no thrash */
+#define VT100_TTF_FONT_CAPSULE "fonts:JetBrainsMono-Regular.ttf"
+
+typedef enum {
+    VT_GLYPH_BITMAP = 0,  /* font_8x16.c, via fb_draw_glyph() */
+    VT_GLYPH_TTF    = 1,  /* TTF-TEXT's rasterizer, via ttf_draw_glyph_cell() */
+} vt_glyph_mode_t;
+
+static vt_glyph_mode_t     g_glyph_mode  = VT_GLYPH_BITMAP;
+static ttf_font_t          g_ttf_font;
+static int                 g_ttf_ready   = 0;
+static ttf_raster_cache_t  g_ttf_cache;
+
 /* -----------------------------------------------------------------------
  * Parser state enum
  * --------------------------------------------------------------------- */
@@ -110,9 +143,13 @@ static void apply_sgr(void);
  * Internal helpers
  * --------------------------------------------------------------------- */
 
-/* Framebuffer cell dimensions (pixels) — reads from framebuffer driver */
-static uint32_t cell_w(void) { return fb_cell_w(); }
-static uint32_t cell_h(void) { return fb_cell_h(); }
+/* Cell dimensions (pixels) — font_8x16.c's fixed 8x16 grid in bitmap mode,
+ * or the provisional TTF cell (4.4j) once vt100_enable_ttf() has switched
+ * modes. Mode-aware per 4.4i's finding that the grid was hardcoded to
+ * font_8x16.c specifically; this is the generalization that item called
+ * for. */
+static uint32_t cell_w(void) { return g_glyph_mode == VT_GLYPH_TTF ? VT100_TTF_CELL_W_PX : fb_cell_w(); }
+static uint32_t cell_h(void) { return g_glyph_mode == VT_GLYPH_TTF ? VT100_TTF_CELL_H_PX : fb_cell_h(); }
 
 /* Pixel position of the top-left corner of character cell (cx, cy) */
 static uint32_t px_of(uint32_t col) { return col * cell_w(); }
@@ -122,6 +159,46 @@ static uint32_t py_of(uint32_t row) { return row * cell_h(); }
 static uint32_t eff_fg(void) { return g_vt.reverse ? g_vt.bg : g_vt.fg; }
 static uint32_t eff_bg(void) { return g_vt.reverse ? g_vt.fg : g_vt.bg; }
 
+/* Draw one glyph via the TTF rasterizer into the cell at pixel (cell_px,
+ * cell_py). Mirrors fb_draw_glyph()'s opaque-cell contract (every pixel in
+ * the cell gets either fg or bg, not just the glyph's "ink") by filling
+ * the whole cell with bg first, then stamping covered bitmap pixels with
+ * fg. Baseline sits VT100_TTF_SIZE_PX down from the cell's top, matching
+ * TTF-TEXT's own bitmap-origin convention (ttf.h's
+ * "glyph baseline sits at pixel (MARGIN, size_px + MARGIN)"). Bitmap
+ * pixels are clipped to the cell rect -- a glyph's rasterized bounds can
+ * slightly exceed the nominal advance width, and cells must stay opaque
+ * neighbors, not bleed into each other. */
+static void ttf_draw_glyph_cell(uint32_t cell_px, uint32_t cell_py, uint8_t ch,
+                                 uint32_t fg, uint32_t bg)
+{
+    ttf_bitmap_t bmp;
+    int rc, was_hit;
+    uint32_t bx, by;
+    uint32_t baseline_y = cell_py + VT100_TTF_SIZE_PX;
+
+    fb_fill_rect(cell_px, cell_py, cell_w(), cell_h(), bg);
+
+    if (!g_ttf_ready) return; /* shouldn't happen once VT_GLYPH_TTF is set, defensive only */
+
+    rc = ttf_raster_cache_get(&g_ttf_cache, &g_ttf_font, (uint32_t)ch,
+                               VT100_TTF_SIZE_PX, &bmp, &was_hit);
+    if (rc != TTF_OK) return; /* missing/unrasterizable glyph -- leave cell blank (bg only) */
+
+    for (by = 0; by < bmp.height; by++) {
+        int32_t fb_y = (int32_t)baseline_y + (int32_t)by
+                       - (int32_t)VT100_TTF_SIZE_PX - TTF_CACHE_MARGIN;
+        if (fb_y < (int32_t)cell_py || fb_y >= (int32_t)(cell_py + cell_h())) continue;
+        for (bx = 0; bx < bmp.width; bx++) {
+            int32_t fb_x = (int32_t)cell_px + (int32_t)bx - TTF_CACHE_MARGIN;
+            if (fb_x < (int32_t)cell_px || fb_x >= (int32_t)(cell_px + cell_w())) continue;
+            if (bmp.pixels[by * bmp.width + bx]) {
+                fb_put_pixel((uint32_t)fb_x, (uint32_t)fb_y, fg);
+            }
+        }
+    }
+}
+
 static void draw_cursor_glyph(uint8_t ch)
 {
     uint32_t f = eff_fg();
@@ -138,11 +215,22 @@ static void draw_cursor_glyph(uint8_t ch)
         f = FB_RGB(r, g, bv);
     }
 
-    fb_draw_glyph(px_of(g_vt.cx), py_of(g_vt.cy), ch, f, b);
+    if (g_glyph_mode == VT_GLYPH_TTF) {
+        ttf_draw_glyph_cell(px_of(g_vt.cx), py_of(g_vt.cy), ch, f, b);
+    } else {
+        fb_draw_glyph(px_of(g_vt.cx), py_of(g_vt.cy), ch, f, b);
+    }
 
     if (g_vt.underline) {
-        uint32_t scale = cell_h() / 16u;
-        uint32_t ul_y  = py_of(g_vt.cy) + UNDERLINE_ROW * scale;
+        /* font_8x16 mode: underline sits at UNDERLINE_ROW (row 14 of 16)
+         * of that font's fixed grid, scaled. TTF mode: no equivalent fixed
+         * row exists (this parser doesn't read hhea underline metrics --
+         * see ttf.h) -- placed 2px below the baseline instead, a
+         * provisional choice like the rest of 4.4j's TTF cell geometry. */
+        uint32_t scale = g_glyph_mode == VT_GLYPH_TTF ? 1u : cell_h() / 16u;
+        uint32_t ul_y  = g_glyph_mode == VT_GLYPH_TTF
+                        ? py_of(g_vt.cy) + VT100_TTF_SIZE_PX + 2u
+                        : py_of(g_vt.cy) + UNDERLINE_ROW * scale;
         fb_fill_rect(px_of(g_vt.cx), ul_y, cell_w(), scale, f);
     }
 }
@@ -195,6 +283,45 @@ void vt100_init(void)
     erase_display(2);
 }
 
+void vt100_enable_ttf(void)
+{
+    if (g_glyph_mode == VT_GLYPH_TTF) return; /* already switched */
+    if (!g_vt.initialized) return;
+
+    if (!g_ttf_ready) {
+        ttf_raster_cache_slot_t *slots;
+        int rc;
+
+        rc = ttf_load_from_capsule(capsule_get_directory(), capsule_get_descriptors(),
+                                    capsule_get_names(), capsule_get_arena(),
+                                    VT100_TTF_FONT_CAPSULE, &g_ttf_font);
+        if (rc != TTF_OK) {
+            log_message(LOG_ERROR, "vt100: TTF font capsule load failed (rc=%d), staying on font_8x16", rc);
+            return;
+        }
+
+        slots = (ttf_raster_cache_slot_t *)kmalloc(sizeof(ttf_raster_cache_slot_t) * VT100_TTF_CACHE_SLOTS);
+        if (!slots) {
+            log_message(LOG_ERROR, "vt100: TTF cache allocation failed, staying on font_8x16");
+            return;
+        }
+        ttf_raster_cache_init(&g_ttf_cache, slots, VT100_TTF_CACHE_SLOTS);
+        g_ttf_ready = 1;
+    }
+
+    g_glyph_mode = VT_GLYPH_TTF;
+
+    /* Cell geometry just changed (font_8x16's fixed 8x16 vs. TTF's
+     * provisional 12x24, see this file's 4.4j block above) -- re-derive
+     * cols/rows and clear, the same as vt100_init() itself does. This only
+     * ever runs once, at the POST-to-REPL boundary (sk_repl()), so nothing
+     * of value is on screen yet to preserve. */
+    g_vt.cols = fb_width()  / cell_w();
+    g_vt.rows = fb_height() / cell_h();
+    g_vt.cx = g_vt.cy = 0;
+    erase_display(2);
+}
+
 uint32_t vt100_cols(void) { return g_vt.cols; }
 uint32_t vt100_rows(void) { return g_vt.rows; }
 
@@ -232,12 +359,17 @@ static void scroll_up(uint32_t lines)
  * Erase operations
  * --------------------------------------------------------------------- */
 
+/* FABRIC.md item 4.4i found this drawing a per-cell blank glyph
+ * (font_8x16.c-specific, and inconsistent with erase_display(2)'s
+ * full-screen case just below, which already used a plain rect fill).
+ * 4.4j fixes both problems at once: a blank cell is visually identical to
+ * a filled bg rect regardless of glyph backend, so this needs no font
+ * involvement at all -- one fb_fill_rect() for the whole range instead of
+ * a per-column glyph draw. */
 static void erase_line_range(uint32_t row, uint32_t c0, uint32_t c1)
 {
-    uint32_t c;
-    for (c = c0; c < c1; c++) {
-        fb_draw_glyph(px_of(c), py_of(row), 0x20, g_vt.fg, g_vt.bg);
-    }
+    if (c1 <= c0) return;
+    fb_fill_rect(px_of(c0), py_of(row), (c1 - c0) * cell_w(), cell_h(), g_vt.bg);
 }
 
 static void erase_display(int mode)

src/starkernel/repl.c

@@ -268,6 +268,13 @@ void sk_repl_run(VM *vm)
 
 void sk_repl(VM *vm)
 {
+    /* FABRIC.md item 4.4j: boot and POST (both already returned by the time
+     * sk_repl() is called) stay on font_8x16.c/VT100 by design; the
+     * interactive REPL -- this function -- is the boundary where TTF-TEXT
+     * takes over. One-shot: console_fb_enable_ttf() no-ops on any later
+     * call. */
+    console_fb_enable_ttf();
+
     console_println(lithos_version);
     console_puts("StarForth Version ");    console_println(STARFORTH_VERSION);
     console_println("");