[PDFBOX-6103] Add DFLT script support in GSUB system for OpenType fonts #351
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This pull request adds support for the DFLT (default) script to the GSUB (Glyph Substitution) system in FontBox, enabling script-neutral typographic features for fonts that use the DFLT script table. It introduces a new
GsubWorkerForDfltclass, updates the language enum, and provides comprehensive tests to ensure correct behavior for both pass-through and ligature substitution scenarios.DFLT Script Support:
GsubWorkerForDfltimplementation to handle script-neutral GSUB features in the DFLT script, following OpenType recommendations for feature processing order (ccmp,liga,clig,calt). (fontbox/src/main/java/org/apache/fontbox/ttf/gsub/GsubWorkerForDflt.java)Languageenum to include the DFLT script, allowing it to be recognized and processed. (fontbox/src/main/java/org/apache/fontbox/ttf/model/Language.java)GsubWorkerFactoryto return aGsubWorkerForDfltinstance when the DFLT script is detected. (fontbox/src/main/java/org/apache/fontbox/ttf/gsub/GsubWorkerFactory.java)Testing and Validation:
GsubWorkerForDflt, verifying correct pass-through for fonts without ligature features and proper ligature substitution for fonts with standard ligatures in the DFLT script. (fontbox/src/test/java/org/apache/fontbox/ttf/gsub/GsubWorkerForDfltTest.java)