Feat(text tool): Add import custom fonts

docs/src/content/docs/development/Front End/text-tool.mdx

@@ -1,5 +1,5 @@
 ---
-title: "Canvas Text Tool"
+title: 'Canvas Text Tool'
 ---
 
 ## Overview
@@ -29,6 +29,13 @@ Layer placement preserves the original click location:
 
 Font definitions live in `invokeai/frontend/web/src/features/controlLayers/text/textConstants.ts` as ten deterministic stacks (sans, serif, mono, rounded, script, humanist, slab serif, display, narrow, UI serif). Each stack lists system-safe fallbacks so the editor can choose the first available font per platform.
 
+The Text tool also supports server-managed custom fonts from the InvokeAI root `fonts` directory:
+
+- `invokeai/app/services/config/config_default.py` ensures the `fonts` directory and `README.txt` exist.
+- `invokeai/app/api/routers/utilities.py` lists supported font files (`.ttf`, `.otf`, `.woff`, `.woff2`) and serves them to the frontend.
+- `invokeai/frontend/web/src/features/controlLayers/components/Text/TextToolOptions.tsx` groups custom fonts separately from built-in stacks and keeps them disabled until their `FontFace` entries are ready.
+- `invokeai/frontend/web/src/features/controlLayers/konva/CanvasTool/CanvasTextToolModule.ts` waits for custom font readiness before rasterizing text, avoiding fallback renders when a font has been listed but not fully loaded yet.
+
 To add or adjust fonts:
 
 1. Update `TEXT_FONT_STACKS` with the new `id`, `label`, and CSS `font-family` stack.

docs/src/content/docs/features/Canvas/text-tool.mdx

@@ -10,6 +10,17 @@ import { LinkCard } from '@astrojs/starlight/components';
 
 The Text tool uses a set of predefined font stacks. When you choose a font, the app resolves the first available font on your system from that stack and uses it for both the editor overlay and the rasterized result. This provides consistent styling across platforms while still falling back to safe system fonts if a preferred font is missing.
 
+## Custom fonts
+
+InvokeAI can also load custom fonts from the host-managed `fonts` directory in the InvokeAI root folder.
+
+- On startup, InvokeAI creates `fonts/README.txt` if the directory does not already exist.
+- Place `.ttf`, `.otf`, `.woff`, or `.woff2` files in `fonts` or any subfolder under it.
+- Refresh the app after adding or removing fonts so the Text tool can reload the available font list.
+- If the `fonts` directory is empty, the Text tool continues to use the built-in font list.
+
+In multiuser deployments, this directory is shared by the entire InvokeAI instance. Fonts added there are available to all authenticated users of that server.
+
 ## Size and spacing
 
 - **Size** controls the font size in pixels.

invokeai/app/api/routers/utilities.py

@@ -1,15 +1,20 @@
 import asyncio
 import logging
+import re
 import threading
 from pathlib import Path
 from typing import Optional, Union
+from urllib.parse import quote
 
 import torch
 from dynamicprompts.generators import CombinatorialPromptGenerator, RandomPromptGenerator
 from fastapi import Body, HTTPException
 from fastapi.routing import APIRouter
+from fontTools.ttLib import TTFont
+from PIL import ImageFont
 from pydantic import BaseModel, Field
 from pyparsing import ParseException
+from starlette.responses import FileResponse
 from transformers import AutoProcessor, AutoTokenizer, LlavaOnevisionForConditionalGeneration, LlavaOnevisionProcessor
 
 from invokeai.app.api.auth_dependencies import CurrentUserOrDefault
@@ -27,6 +32,7 @@
 logger = logging.getLogger(__name__)
 
 utilities_router = APIRouter(prefix="/v1/utilities", tags=["utilities"])
+SUPPORTED_FONT_EXTENSIONS = {".ttf", ".otf", ".woff", ".woff2"}
 
 # The underlying model loader is not thread-safe, so we serialize load_model calls.
 _model_load_lock = threading.Lock()
@@ -37,6 +43,26 @@ class DynamicPromptsResponse(BaseModel):
     error: Optional[str] = None
 
 
+class UserFontFace(BaseModel):
+    path: str
+    url: str
+    weight: int
+    style: str
+
+
+class UserFont(BaseModel):
+    id: str
+    family: str
+    label: str
+    path: str
+    url: str
+    faces: list[UserFontFace]
+
+
+class UserFontsResponse(BaseModel):
+    fonts: list[UserFont]
+
+
 @utilities_router.post(
     "/dynamicprompts",
     operation_id="parse_dynamicprompts",
@@ -79,6 +105,249 @@ async def parse_dynamicprompts(
     return DynamicPromptsResponse(prompts=prompts if prompts else [""], error=error)
 
 
+def _get_fonts_dir() -> Path:
+    root = ApiDependencies.invoker.services.configuration.root_path
+    return root / "fonts"
+
+
+def _path_has_symlink_component(path: Path, boundary: Path) -> bool:
+    current = path
+    boundary = boundary.absolute()
+    try:
+        current.absolute().relative_to(boundary)
+    except ValueError:
+        return True
+
+    while True:
+        if current.exists() and current.is_symlink():
+            return True
+        if current == boundary:
+            return False
+        current = current.parent
+
+
+def _get_name_table_value(font: TTFont, name_ids: tuple[int, ...]) -> str | None:
+    if "name" not in font:
+        return None
+
+    def _sort_key(record: object) -> tuple[int, int]:
+        platform_id = getattr(record, "platformID", -1)
+        lang_id = getattr(record, "langID", -1)
+        if platform_id == 3 and lang_id in (0x0409, 0):
+            return (0, 0)
+        if platform_id == 3:
+            return (1, 0)
+        if platform_id == 0:
+            return (2, 0)
+        return (3, lang_id)
+
+    records = font["name"].names
+    for name_id in name_ids:
+        for record in sorted((record for record in records if record.nameID == name_id), key=_sort_key):
+            try:
+                value = record.toUnicode().strip()
+            except Exception:
+                continue
+            if value:
+                return value
+    return None
+
+
+def _normalize_variant_text(value: str) -> str:
+    value = re.sub(r"(?<=[a-z])(?=[A-Z])", " ", value)
+    value = value.replace("_", " ").replace("-", " ")
+    value = re.sub(r"\s+", " ", value)
+    return value.strip().lower()
+
+
+def _infer_font_weight(style_name: str, file_stem: str, weight_class: int | None) -> int:
+    if isinstance(weight_class, int) and 1 <= weight_class <= 1000:
+        return weight_class
+
+    combined = _normalize_variant_text(f"{style_name} {file_stem}")
+    # Ordering matters: more specific keywords must be matched before "bold".
+    weight_keywords = [
+        (("thin", "hairline"), 100),
+        (("extra light", "ultra light", "extralight", "ultralight"), 200),
+        (("light",), 300),
+        (("normal", "regular", "roman", "book"), 400),
+        (("medium",), 500),
+        (("semi bold", "semibold", "demi bold", "demibold"), 600),
+        (("extra bold", "ultra bold", "extrabold", "ultrabold"), 800),
+        (("black", "heavy"), 900),
+        (("bold",), 700),
+    ]
+    for keywords, weight in weight_keywords:
+        if any(keyword in combined for keyword in keywords):
+            return weight
+
+    return 400
+
+
+def _infer_font_style(style_name: str, file_stem: str, italic_flag: bool) -> str:
+    if italic_flag:
+        return "italic"
+
+    combined = _normalize_variant_text(f"{style_name} {file_stem}")
+    if "italic" in combined or "oblique" in combined:
+        return "italic"
+
+    return "normal"
+
+
+def _get_font_metadata(font_file: Path) -> tuple[str, str, int, str] | None:
+    ttfont_error: Exception | None = None
+    try:
+        with TTFont(font_file.as_posix(), lazy=True) as font:
+            family_name = (_get_name_table_value(font, (16, 1)) or "").strip()
+            style_name = (_get_name_table_value(font, (17, 2)) or "").strip()
+            os2_table = font["OS/2"] if "OS/2" in font else None
+            head_table = font["head"] if "head" in font else None
+            post_table = font["post"] if "post" in font else None
+            weight_class = getattr(os2_table, "usWeightClass", None)
+            italic_flag = bool(getattr(os2_table, "fsSelection", 0) & 0x01) or bool(
+                getattr(head_table, "macStyle", 0) & 0x02
+            )
+            if post_table is not None:
+                italic_flag = italic_flag or bool(getattr(post_table, "italicAngle", 0))
+            if family_name:
+                return (
+                    family_name,
+                    family_name,
+                    _infer_font_weight(style_name, font_file.stem, weight_class),
+                    _infer_font_style(style_name, font_file.stem, italic_flag),
+                )
+    except Exception as e:
+        ttfont_error = e
+
+    try:
+        font = ImageFont.truetype(font_file.as_posix(), size=16)
+        family_name, style_name = font.getname()
+        family_name = family_name.strip()
+        style_name = style_name.strip()
+        if family_name:
+            return (
+                family_name,
+                family_name,
+                _infer_font_weight(style_name, font_file.stem, None),
+                _infer_font_style(style_name, font_file.stem, False),
+            )
+    except Exception as e:
+        logger.warning(
+            "Skipping font file %s: unable to read font metadata with fontTools or Pillow (%s, %s)",
+            font_file,
+            type(ttfont_error).__name__ if ttfont_error else "no-fontTools-error",
+            type(e).__name__,
+            exc_info=e,
+        )
+        return None
+
+    logger.warning("Skipping font file %s: missing font family metadata", font_file)
+    return None
+
+
+def _resolve_font_request_path(font_path: str) -> Path:
+    fonts_dir = _get_fonts_dir()
+    if not fonts_dir.exists() or not fonts_dir.is_dir():
+        raise HTTPException(status_code=404, detail="Font file not found")
+
+    requested = (fonts_dir / font_path).absolute()
+    if _path_has_symlink_component(requested, fonts_dir):
+        raise HTTPException(status_code=400, detail="Invalid font path")
+
+    resolved_fonts_dir = fonts_dir.resolve()
+    resolved_requested = requested.resolve()
+
+    try:
+        resolved_requested.relative_to(resolved_fonts_dir)
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail="Invalid font path") from e
+
+    return resolved_requested
+
+
+@utilities_router.get(
+    "/fonts",
+    operation_id="list_user_fonts",
+    responses={200: {"model": UserFontsResponse}},
+)
+async def list_user_fonts(_current_user: CurrentUserOrDefault) -> UserFontsResponse:
+    fonts_dir = _get_fonts_dir()
+    if not fonts_dir.exists() or not fonts_dir.is_dir() or fonts_dir.is_symlink():
+        return UserFontsResponse(fonts=[])
+
+    family_candidates: dict[str, list[tuple[Path, str, str, int, str]]] = {}
+    # key -> [(font_file, relative, family, weight, style)]
+    for font_file in sorted(fonts_dir.rglob("*")):
+        if _path_has_symlink_component(font_file.absolute(), fonts_dir):
+            continue
+        if not font_file.is_file() or font_file.suffix.lower() not in SUPPORTED_FONT_EXTENSIONS:
+            continue
+        relative = font_file.relative_to(fonts_dir).as_posix()
+        metadata = _get_font_metadata(font_file)
+        if metadata is None:
+            continue
+        family, _label, weight, style = metadata
+        family_key = family.strip().lower()
+        family_candidates.setdefault(family_key, []).append((font_file, relative, family, weight, style))
+
+    def _candidate_score(weight: int, style: str, path: Path) -> tuple[int, int, int]:
+        """Lower score is better. Prefer regular/normal faces, then shorter names."""
+        return (0 if style == "normal" else 1, abs(weight - 400), len(path.stem))
+
+    fonts: list[UserFont] = []
+    for _, candidates in sorted(family_candidates.items(), key=lambda kv: kv[0]):
+        _, selected_relative, selected_family, _, _ = min(candidates, key=lambda c: _candidate_score(c[3], c[4], c[0]))
+        faces_by_variant: dict[tuple[int, str], tuple[Path, str, str, int, str]] = {}
+        for candidate in candidates:
+            variant_key = (candidate[3], candidate[4])
+            current = faces_by_variant.get(variant_key)
+            if current is None or _candidate_score(candidate[3], candidate[4], candidate[0]) < _candidate_score(
+                current[3], current[4], current[0]
+            ):
+                faces_by_variant[variant_key] = candidate
+
+        faces = [
+            UserFontFace(
+                path=relative,
+                url=f"/api/v1/utilities/fonts/{quote(relative)}",
+                weight=weight,
+                style=style,
+            )
+            for (weight, style), (_, relative, _, _, _) in sorted(
+                faces_by_variant.items(), key=lambda item: (item[0][1] != "normal", abs(item[0][0] - 400), item[0][0])
+            )
+        ]
+
+        fonts.append(
+            UserFont(
+                id=f"user:{selected_relative}",
+                family=selected_family,
+                label=selected_family,
+                path=selected_relative,
+                url=f"/api/v1/utilities/fonts/{quote(selected_relative)}",
+                faces=faces,
+            )
+        )
+
+    return UserFontsResponse(fonts=fonts)
+
+
+@utilities_router.get(
+    "/fonts/{font_path:path}",
+    operation_id="get_user_font_file",
+)
+async def get_user_font_file(font_path: str, _current_user: CurrentUserOrDefault) -> FileResponse:
+    requested = _resolve_font_request_path(font_path)
+    if not requested.exists() or not requested.is_file():
+        raise HTTPException(status_code=404, detail="Font file not found")
+
+    if requested.suffix.lower() not in SUPPORTED_FONT_EXTENSIONS:
+        raise HTTPException(status_code=400, detail="Unsupported font format")
+
+    return FileResponse(path=requested)
+
+
 # --- Expand Prompt ---
 
 
@@ -183,7 +452,6 @@ def _run_image_to_prompt(image_name: str, model_key: str, instruction: str) -> s
     with _model_load_lock:
         loaded_model = model_manager.load.load_model(model_config)
 
-    # Load the image from InvokeAI's image store
     image = ApiDependencies.invoker.services.images.get_pil_image(image_name)
     image = image.convert("RGB")