Merge pull request #24022 from VadimLevin:dev/vlevin/python-typing-cuda

Fix python typing stubs generation for CUDA modules #24022

resolves #23946
resolves #23945
resolves opencv/opencv-python#871

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/python/src2/typing_stubs_generation/api_refinement.py

@@ -2,14 +2,17 @@ __all__ = [
     "apply_manual_api_refinement"
 ]
 
-from typing import Sequence, Callable
+from typing import cast, Sequence, Callable, Iterable
 
-from .nodes import (NamespaceNode, FunctionNode, OptionalTypeNode,
-                    ClassProperty, PrimitiveTypeNode)
-from .ast_utils import find_function_node, SymbolName
+from .nodes import (NamespaceNode, FunctionNode, OptionalTypeNode, TypeNode,
+                    ClassProperty, PrimitiveTypeNode, ASTNodeTypeNode,
+                    AggregatedTypeNode)
+from .ast_utils import (find_function_node, SymbolName,
+                        for_each_function_overload)
 
 
 def apply_manual_api_refinement(root: NamespaceNode) -> None:
+    refine_cuda_module(root)
     export_matrix_type_constants(root)
     # Export OpenCV exception class
     builtin_exception = root.add_class("Exception")
@@ -57,13 +60,65 @@ def make_optional_arg(arg_name: str) -> Callable[[NamespaceNode, SymbolName], No
                 continue
 
             overload.arguments[arg_idx].type_node = OptionalTypeNode(
-                overload.arguments[arg_idx].type_node
+                cast(TypeNode, overload.arguments[arg_idx].type_node)
             )
 
     return _make_optional_arg
 
 
-def _find_argument_index(arguments: Sequence[FunctionNode.Arg], name: str) -> int:
+def refine_cuda_module(root: NamespaceNode) -> None:
+    def fix_cudaoptflow_enums_names() -> None:
+        for class_name in ("NvidiaOpticalFlow_1_0", "NvidiaOpticalFlow_2_0"):
+            if class_name not in cuda_root.classes:
+                continue
+            opt_flow_class = cuda_root.classes[class_name]
+            _trim_class_name_from_argument_types(
+                for_each_function_overload(opt_flow_class), class_name
+            )
+
+    def fix_namespace_usage_scope(cuda_ns: NamespaceNode) -> None:
+        USED_TYPES = ("GpuMat", "Stream")
+
+        def fix_type_usage(type_node: TypeNode) -> None:
+            if isinstance(type_node, AggregatedTypeNode):
+                for item in type_node.items:
+                    fix_type_usage(item)
+            if isinstance(type_node, ASTNodeTypeNode):
+                if type_node._typename in USED_TYPES:
+                    type_node._typename = f"cuda_{type_node._typename}"
+
+        for overload in for_each_function_overload(cuda_ns):
+            if overload.return_type is not None:
+                fix_type_usage(overload.return_type.type_node)
+            for type_node in [arg.type_node for arg in overload.arguments
+                              if arg.type_node is not None]:
+                fix_type_usage(type_node)
+
+    if "cuda" not in root.namespaces:
+        return
+    cuda_root = root.namespaces["cuda"]
+    fix_cudaoptflow_enums_names()
+    for ns in [ns for ns_name, ns in root.namespaces.items()
+               if ns_name.startswith("cuda")]:
+        fix_namespace_usage_scope(ns)
+
+
+def _trim_class_name_from_argument_types(
+    overloads: Iterable[FunctionNode.Overload],
+    class_name: str
+) -> None:
+    separator = f"{class_name}_"
+    for overload in overloads:
+        for arg in [arg for arg in overload.arguments
+                    if arg.type_node is not None]:
+            ast_node = cast(ASTNodeTypeNode, arg.type_node)
+            if class_name in ast_node.ctype_name:
+                fixed_name = ast_node._typename.split(separator)[-1]
+                ast_node._typename = fixed_name
+
+
+def _find_argument_index(arguments: Sequence[FunctionNode.Arg],
+                         name: str) -> int:
     for i, arg in enumerate(arguments):
         if arg.name == name:
             return i
@@ -76,6 +131,7 @@ NODES_TO_REFINE = {
     SymbolName(("cv", ), (), "resize"): make_optional_arg("dsize"),
     SymbolName(("cv", ), (), "calcHist"): make_optional_arg("mask"),
 }
+
 ERROR_CLASS_PROPERTIES = (
     ClassProperty("code", PrimitiveTypeNode.int_(), False),
     ClassProperty("err", PrimitiveTypeNode.str_(), False),

modules/python/src2/typing_stubs_generation/ast_utils.py

@@ -1,5 +1,5 @@
 from typing import (NamedTuple, Sequence, Tuple, Union, List,
-                    Dict, Callable, Optional)
+                    Dict, Callable, Optional, Generator)
 import keyword
 
 from .nodes import (ASTNode, NamespaceNode, ClassNode, FunctionNode,
@@ -404,6 +404,33 @@ def get_enum_module_and_export_name(enum_node: EnumerationNode) -> Tuple[str, st
     return enum_export_name, namespace_node.full_export_name
 
 
+def for_each_class(
+    node: Union[NamespaceNode, ClassNode]
+) -> Generator[ClassNode, None, None]:
+    for cls in node.classes.values():
+        yield cls
+        if len(cls.classes):
+            yield from for_each_class(cls)
+
+
+def for_each_function(
+    node: Union[NamespaceNode, ClassNode],
+    traverse_class_nodes: bool = True
+) -> Generator[FunctionNode, None, None]:
+    yield from node.functions.values()
+    if traverse_class_nodes:
+        for cls in for_each_class(node):
+            yield from for_each_function(cls)
+
+
+def for_each_function_overload(
+    node: Union[NamespaceNode, ClassNode],
+    traverse_class_nodes: bool = True
+) -> Generator[FunctionNode.Overload, None, None]:
+    for func in for_each_function(node, traverse_class_nodes):
+        yield from func.overloads
+
+
 if __name__ == '__main__':
     import doctest
     doctest.testmod()

modules/python/src2/typing_stubs_generation/generation.py

@@ -3,17 +3,20 @@ __all__ = ("generate_typing_stubs", )
 from io import StringIO
 from pathlib import Path
 import re
-from typing import (Generator, Type, Callable, NamedTuple, Union, Set, Dict,
+from typing import (Type, Callable, NamedTuple, Union, Set, Dict,
                     Collection, Tuple, List)
 import warnings
 
-from .ast_utils import get_enclosing_namespace, get_enum_module_and_export_name
+from .ast_utils import (get_enclosing_namespace,
+                        get_enum_module_and_export_name,
+                        for_each_function_overload,
+                        for_each_class)
 
 from .predefined_types import PREDEFINED_TYPES
 from .api_refinement import apply_manual_api_refinement
 
-from .nodes import (ASTNode, ASTNodeType, NamespaceNode, ClassNode, FunctionNode,
-                    EnumerationNode, ConstantNode)
+from .nodes import (ASTNode, ASTNodeType, NamespaceNode, ClassNode,
+                    FunctionNode, EnumerationNode, ConstantNode)
 
 from .nodes.type_node import (TypeNode, AliasTypeNode, AliasRefTypeNode,
                               AggregatedTypeNode, ASTNodeTypeNode,
@@ -105,8 +108,9 @@ def _generate_typing_stubs(root: NamespaceNode, output_path: Path) -> None:
 
     # NOTE: Enumerations require special handling, because all enumeration
     # constants are exposed as module attributes
-    has_enums = _generate_section_stub(StubSection("# Enumerations", EnumerationNode),
-                                       root, output_stream, 0)
+    has_enums = _generate_section_stub(
+        StubSection("# Enumerations", EnumerationNode), root, output_stream, 0
+    )
     # Collect all enums from class level and export them to module level
     for class_node in root.classes.values():
         if _generate_enums_from_classes_tree(class_node, output_stream, indent=0):
@@ -536,30 +540,6 @@ def check_overload_presence(node: Union[NamespaceNode, ClassNode]) -> bool:
             return True
     return False
 
-
-def _for_each_class(node: Union[NamespaceNode, ClassNode]) \
-        -> Generator[ClassNode, None, None]:
-    for cls in node.classes.values():
-        yield cls
-        if len(cls.classes):
-            yield from _for_each_class(cls)
-
-
-def _for_each_function(node: Union[NamespaceNode, ClassNode]) \
-        -> Generator[FunctionNode, None, None]:
-    for func in node.functions.values():
-        yield func
-    for cls in node.classes.values():
-        yield from _for_each_function(cls)
-
-
-def _for_each_function_overload(node: Union[NamespaceNode, ClassNode]) \
-        -> Generator[FunctionNode.Overload, None, None]:
-    for func in _for_each_function(node):
-        for overload in func.overloads:
-            yield overload
-
-
 def _collect_required_imports(root: NamespaceNode) -> Set[str]:
     """Collects all imports required for classes and functions typing stubs
     declarations.
@@ -582,7 +562,7 @@ def _collect_required_imports(root: NamespaceNode) -> Set[str]:
     has_overload = check_overload_presence(root)
     # if there is no module-level functions with overload, check its presence
     # during class traversing, including their inner-classes
-    for cls in _for_each_class(root):
+    for cls in for_each_class(root):
         if not has_overload and check_overload_presence(cls):
             has_overload = True
             required_imports.add("import typing")
@@ -600,8 +580,9 @@ def _collect_required_imports(root: NamespaceNode) -> Set[str]:
     if has_overload:
         required_imports.add("import typing")
     # Importing modules required to resolve functions arguments
-    for overload in _for_each_function_overload(root):
-        for arg in filter(lambda a: a.type_node is not None, overload.arguments):
+    for overload in for_each_function_overload(root):
+        for arg in filter(lambda a: a.type_node is not None,
+                          overload.arguments):
             _add_required_usage_imports(arg.type_node, required_imports)  # type: ignore
         if overload.return_type is not None:
             _add_required_usage_imports(overload.return_type.type_node,
@@ -625,11 +606,13 @@ def _populate_reexported_symbols(root: NamespaceNode) -> None:
 
     _reexport_submodule(root)
 
-    # Special cases, symbols defined in possible pure Python submodules should be
+    # Special cases, symbols defined in possible pure Python submodules
+    # should be
     root.reexported_submodules_symbols["mat_wrapper"].append("Mat")
 
 
-def _write_reexported_symbols_section(module: NamespaceNode, output_stream: StringIO) -> None:
+def _write_reexported_symbols_section(module: NamespaceNode,
+                                      output_stream: StringIO) -> None:
     """Write re-export section for the given module.
 
     Re-export statements have from `from module_name import smth as smth`.

modules/python/src2/typing_stubs_generation/predefined_types.py

@@ -22,6 +22,10 @@ _PREDEFINED_TYPES = (
     PrimitiveTypeNode.int_("uchar"),
     PrimitiveTypeNode.int_("unsigned"),
     PrimitiveTypeNode.int_("int64"),
+    PrimitiveTypeNode.int_("uint8_t"),
+    PrimitiveTypeNode.int_("int8_t"),
+    PrimitiveTypeNode.int_("int32_t"),
+    PrimitiveTypeNode.int_("uint32_t"),
     PrimitiveTypeNode.int_("size_t"),
     PrimitiveTypeNode.float_("float"),
     PrimitiveTypeNode.float_("double"),