Fix Any subclassing in fpdf2 (#9536)

stubs/fpdf2/@tests/stubtest_allowlist.txt

@@ -6,6 +6,9 @@ fpdf.fpdf.FPDF.output
 fpdf.FPDF.set_creation_date
 fpdf.fpdf.FPDF.set_creation_date
 
+# fonttools shims since we can't import it
+fpdf._fonttools_shims
+
 # Checking the following function crashes stubtest 0.991, but seems to be
 # fixed in later versions.
 fpdf.FPDF.set_encryption

stubs/fpdf2/fpdf/_fonttools_shims.pyi

@@ -0,0 +1,52 @@
+# from fontTools.misc.loggingTools
+from abc import ABCMeta, abstractmethod
+from collections.abc import Mapping
+from logging import Logger
+from typing import Protocol
+from typing_extensions import TypeAlias
+
+# from fonttools.ttLib.ttGlyphSet
+class _TTGlyph(Protocol):
+    def __init__(self, glyphSet: _TTGlyphSet, glyphName: str) -> None: ...
+    def draw(self, pen) -> None: ...
+    def drawPoints(self, pen) -> None: ...
+
+_TTGlyphSet: TypeAlias = Mapping[str, _TTGlyph]  # Simplified for our needs
+
+# from fontTools.misc.loggingTools
+
+class LogMixin:
+    @property
+    def log(self) -> Logger: ...
+
+# from fontTools.pens.basePen
+class AbstractPen:
+    @abstractmethod
+    def moveTo(self, pt: tuple[float, float]) -> None: ...
+    @abstractmethod
+    def lineTo(self, pt: tuple[float, float]) -> None: ...
+    @abstractmethod
+    def curveTo(self, *points: tuple[float, float]) -> None: ...
+    @abstractmethod
+    def qCurveTo(self, *points: tuple[float, float]) -> None: ...
+    def closePath(self) -> None: ...
+    def endPath(self) -> None: ...
+    @abstractmethod
+    def addComponent(self, glyphName: str, transformation: tuple[float, float, float, float, float, float]) -> None: ...
+
+class LoggingPen(LogMixin, AbstractPen, metaclass=ABCMeta): ...
+
+class DecomposingPen(LoggingPen, metaclass=ABCMeta):
+    skipMissingComponents: bool
+    glyphSet: _TTGlyphSet | None
+    def __init__(self, glyphSet: _TTGlyphSet | None) -> None: ...
+    def addComponent(self, glyphName: str, transformation: tuple[float, float, float, float, float, float]) -> None: ...
+
+class BasePen(DecomposingPen):
+    def __init__(self, glyphSet: _TTGlyphSet | None = ...) -> None: ...
+    def closePath(self) -> None: ...
+    def endPath(self) -> None: ...
+    def moveTo(self, pt: tuple[float, float]) -> None: ...
+    def lineTo(self, pt: tuple[float, float]) -> None: ...
+    def curveTo(self, *points: tuple[float, float]) -> None: ...
+    def qCurveTo(self, *points: tuple[float, float]) -> None: ...

stubs/fpdf2/fpdf/svg.pyi

@@ -1,9 +1,10 @@
 from _typeshed import Incomplete
 from collections.abc import Callable
 from re import Pattern
-from typing_extensions import TypeAlias
 
-_BasePen: TypeAlias = Incomplete  # actually fontTools.pens.basePen.BasePen
+from fpdf.drawing import PaintedPath
+
+from ._fonttools_shims import BasePen, _TTGlyphSet
 
 __pdoc__: dict[str, bool]
 
@@ -56,14 +57,14 @@ class ShapeBuilder:
 
 def convert_transforms(tfstr): ...
 
-class PathPen(_BasePen):
-    pdf_path: Incomplete
+class PathPen(BasePen):
+    pdf_path: PaintedPath
     last_was_line_to: bool
     first_is_move: bool | None
-    def __init__(self, pdf_path, *args, **kwargs): ...
+    def __init__(self, pdf_path: PaintedPath, glyphSet: _TTGlyphSet | None = ...): ...
     def arcTo(self, rx, ry, rotation, arc, sweep, end) -> None: ...
 
-def svg_path_converter(pdf_path, svg_path) -> None: ...
+def svg_path_converter(pdf_path: PaintedPath, svg_path: str) -> None: ...
 
 class SVGObject:
     @classmethod