vk-github18 opened a new pull request, #561:
URL: https://github.com/apache/pdfbox/pull/561

   ## Summary
   
   This change adds extension points to the PDFBox glyph-layout processors and 
font loaders, allowing subclasses to customize font creation without replacing 
the existing loading and layout flow.
   
   ## Motivation
   
   Some integrations require specialized `PDType0Font` implementations—for 
example, to provide custom font behavior alongside glyph layout. The existing 
implementation directly created `PDType0Font` instances and instantiated its 
font loaders internally, limiting customization without duplicating 
implementation code.
   
   ## Changes
   
   - Add overridable font-loader factory methods to `GlyphLayoutProcessorAwt` 
and `GlyphLayoutProcessorFop`.
   - Add overridable `loadPDType0Font(...)` methods to the AWT and FOP font 
loaders.
   - Make the `PDType0Font` constructor that accepts a `TrueTypeFont` 
`protected`, enabling subclasses to create specialized Type 0 fonts.
   - Make `supportsFont(...)` verify that the supplied font is a `PDType0Font` 
before checking loader support.
   
   ## Compatibility
   
   Default font loading and glyph-layout behavior are unchanged. The new 
extension points are opt-in and intended for subclasses.
   
   ## Testing
   
   No test changes are included in this branch. 


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