winnerz 1.2.2

A robust Python wrapper for high-performance PDF rendering and text extraction using C++ core.

WinnerZ Python Library Documentation

Overview

The winnerz library is a robust Python wrapper designed for processing, rendering, and manipulating PDF documents. It relies on a high-performance, multi-threaded C++ core extension (winnerz_core) for intensive operations while providing seamless fallback mechanisms and caching strategies in Python.

The architecture emphasizes blistering-fast text extraction, reliability, and fault-tolerance, specifically in handling binary dependencies, dynamic core library loading, and flexible preview rendering via PDFium.

Architecture

The system is divided into several conceptual layers:

1. Core Loader & Diagnostics: Handles the dynamic importing of the C++ binary (winnerz_core), including binary size verification, truncation repair, and Windows DLL directory management.
2. Document Object Model: Provides Pythonic abstractions (Document, Page) to interact with PDF files, managing resources and state safely.
3. Thread-Safe Interpreter Pipeline: A C++ native, thread-safe PDF token interpreter that leverages std::async for parallel multi-page text extraction, eliminating GIL bottlenecks.
4. Rendering Pipeline: Integrates the C++ rendering engine with a fallback Python-based preview engine using pypdfium2.
5. Geometry & Data Structures: Implements domain-specific types (Rect, Matrix, Pixmap) to standardize data flow between the C++ layer and Python runtime.

Core Loading Mechanism

The library initializes the C++ binary through _load_core(). This system provides the following safety guarantees:

• Thread Safety: Uses threading.Lock() to ensure the core is initialized exactly once.
• Retry Logic: Implements a retry loop (_CORE_IMPORT_RETRIES = 3) to mitigate transient filesystem or OS-level loading issues.
• Self-Healing: If a truncated binary is detected (e.g., due to an interrupted build or copy), _try_repair_truncated_core_binary() attempts to restore it from other valid candidate binaries in the directory.
• Diagnostic Reporting: Generates detailed error messages specifying binary ABI mismatches (e.g., GLIBC mismatches) or binary sizes to accelerate debugging.

Environment Variables

• WINNERZ_PREVIEW_BACKEND: Controls the backend used for rendering preview data when the C++ core returns placeholder data.
  • Valid values: auto (default), pdfium.
  • Resolution order for auto: Uses PDFium when available.

Class Reference

Document

Represents a PDF document instance. It manages the lifecycle of the underlying file, featuring a lazy-loading fallback architecture: it natively opens the PDF via C++ by default and only invokes PDFium for decryption or file repair if the document is encrypted or structurally corrupted.

Constructor:

• Document(path_or_bytes): Resolves the file path or raw memory bytes (Zero-Disk mode) and instantly initializes the C++ core. If encryption is detected (e.g. RC4/AES), it falls back to an automatic decryption routine seamlessly in RAM or via a temporary file.

Methods:

• __getitem__(index): Retrieves a Page object at the specified 0-based index. Supports negative indexing.
• __len__(): Returns the total number of pages in the document.
• extract_all_text_concurrent(): A highly optimized utility that utilizes C++ multi-threading to extract text from all pages. It uses a dynamic hardware-concurrency batching mechanism to process pages in chunks (scaling automatically with the number of CPU cores). This entirely bypasses the Python GIL and prevents thread-exhaustion (EAGAIN) on massive 5000+ page PDFs.
• tobytes(): (Zero-Disk) Returns the finalized PDF as a raw byte array directly from RAM, avoiding any disk I/O.
• redact_text_multiple_pages(output_path, page_rects_map): (Native C++) Safely performs parallel Block Redaction across multiple pages and saves the cleaned output directly to a file. This is the recommended and most stable approach.
• redact_text_multiple_pages_to_bytes(page_rects_map): (Native C++) Similar to the above, but returns the cleaned PDF as bytes. Use with caution on very large files to avoid memory pressure.
• close(): Cleans up temporary resources, such as decrypted temporary files and in-memory editing buffers.

Page

Represents a single page within a Document.

Methods:

• get_text(mode="dict", sort=False): Extracts text content.
  • mode: Can be dict, rawdict, blocks, or text.
• get_drawings(): Extracts vector drawings and graphics, mapping them to structured dictionaries containing rect, fill, and stroke properties.
• get_pixmap(matrix=None, clip=None): Renders the page to a bitmap image (Pixmap). It attempts to render using the C++ core; if that fails or returns a placeholder, it falls back to the PDFium preview backend.
• redact_text(rects, output_path, min_overlap_ratio=0.0): (Legacy C++ Core) Applies text-only redaction to the specified rectangles and saves the output to a new PDF file.
• clean_contents(): Completely wipes out the vector graphics and text layer of the current page.
• insert_image(rect, stream=None): Inserts an image (from bytes) into the specified rectangle. It handles internal PDF matrix transformations automatically.
• show_pdf_page(rect, doc_src, page_idx, overlay=True, keep_proportion=True): Queues a complex overlay operation. It places a page from another document (doc_src) onto the current page, scaling it to fit rect while optionally keeping aspect ratio via keep_proportion. The actual merge is executed efficiently during doc.save().
• rect (Property): Retrieves the bounding box of the page as a Rect.

Pixmap

Represents an uncompressed image buffer containing pixel data.

Properties:

• width, height: Dimensions in pixels.
• n: Number of channels (e.g., 4 for RGBA).
• stride: Number of bytes per row.
• samples: Raw byte array of pixel data.

Methods:

• pixel(x, y): Returns a tuple representing the pixel color at the specified coordinates.
• tobytes(fmt="raw"): Encodes the pixmap to the requested format. Supported formats include raw, rgba, png, jpg, and jpeg. Output formats other than raw require the Pillow library.

Geometry Classes

• Rect(x0, y0, x1, y1): Represents a rectangle. Provides properties for width, height, and is_empty. Overloads the & operator to compute the intersection of two rectangles.
• Matrix(sx=1.0, sy=1.0): Represents a 2D scaling matrix.

Caching Strategy

The module implements file-based caching for document instances to minimize redundant initialization and file I/O operations.

• Global Document Cache: Managed via winnerz.open(path). Validates cache hits using file signature metrics (file size and modification time in nanoseconds).

  [!TIP] If you need to open multiple copies of the same file concurrently or bypass this cache (e.g., in background workers), initialize the document directly using winnerz.Document(path) instead of winnerz.open().

• Preview Document Cache: A separate caching layer strictly for the pypdfium2 rendering backend to keep the preview document context alive across multiple page renders.
• C++ Thread-Safe Font Cache: The C++ core utilizes a lock-guarded (std::recursive_mutex) internal cache for Unicode, Width, and CodeSpace maps to prevent data races during parallel text extraction.

Logging

WinnerZ uses standard Python logging under the winnerz logger namespace. Error and debug messages are routed seamlessly to this logger, allowing you to configure professional logging streams similar to pymupdf.

import logging
logging.getLogger("winnerz").setLevel(logging.DEBUG)

Performance Benchmark

Thanks to the native C++ multi-threading pipeline and persistent object caching, WinnerZ outperforms established industry standards like PyMuPDF (fitz) significantly in bulk text extraction tasks.

Tested on a 185-page PDF document (2024-annual-report.pdf):

• ⏱️ PyMuPDF (fitz): ~0.44s
• 🚀 WinnerZ (extract_all_text_concurrent()): ~0.18s (2.5x Faster)

Dependencies

• pypdfium2: Optional but highly recommended. Used for decryption, primary preview rendering, and all In-Memory editing/redaction operations (including high-speed C-level XObject merging).
• Pillow (PIL): Optional. Required for encoding Pixmap instances to PNG/JPEG and manipulating preview images.