Michael Doswald created PDFBOX-3432:
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Summary: Optimize CID to GlyphId mapping (TTF)
Key: PDFBOX-3432
URL: https://issues.apache.org/jira/browse/PDFBOX-3432
Project: PDFBox
Issue Type: Improvement
Components: FontBox
Affects Versions: 2.0.2
Environment: Ubuntu 14.04.4 LTS
Reporter: Michael Doswald
Priority: Trivial
TTF fonts map code-points (Code IDs) to glyphs. These are mappings from int to
int. Because the JDK lacks map classes for primitive types, the code (e.g. in
CmapSubtable) currently uses Map<Integer,Integer> for those mappings. This is
inefficient in different ways:
* Autoboxing/unboxing introduces a performance penalty
* Boxing to Integer objects has a memory overhead
* The JDK Map implementation has a big memory overhead for such simple objects
For efficiency (execution time and memory consumption) I would propose to
introduce a simple IntIntMap implementation which works with primitive integers.
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