fpdfapi/

This subdirectory contains the central implementation of the PDF specification, ranging from low-level parsing to high-level page representation and rendering.

Subdirectories

• cmaps/: Logic and static data for character mapping, providing the necessary infrastructure to support multi-byte character sets (CJK) and custom encoding mappings.
• edit/: Tools for modification and creation. Contains the logic for document generation, page organization, and font subsetting.
• font/: PDF-specific font logic, including Type1, TrueType, and CIDFont implementations, as well as glyph mapping and font resource management.
• page/: Provides a logical representation of PDF objects as high-level page content. This includes managing resources like fonts, colorspaces, and interpreting content streams into interactive objects.
• parser/: The foundations of PDF reading. Handles low-level syntax (objects, arrays, dictionaries), cross-reference tables, and the incremental update system.
• render/: The bridge between the PDF object graph and the graphics engine. It coordinates the translation of page objects into drawing calls for the rendering backends.