John Hewson created PDFBOX-2303:
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Summary: Lazy loading of glyphs in TrueType fonts
Key: PDFBOX-2303
URL: https://issues.apache.org/jira/browse/PDFBOX-2303
Project: PDFBox
Issue Type: Improvement
Components: FontBox
Affects Versions: 2.0.0
Reporter: John Hewson
Assignee: John Hewson
Priority: Minor
FontBox's TTF GlyphTable reads the entire glyph table a constructs and object
for each glyph. However this is very slow for large external fonts (e.g. Asian)
such as "STXihei" which is 15.7MB and has 37,255 glyphs. On my machine it takes
around 9 seconds for PDFBox to load that font just to render 15 glyphs from it.
We can modify GlyphTable to make it lazy so that glyphs are read individually
only when needed.
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