[jira] [Updated] (PDFBOX-3432) Optimize CID to GlyphId mapping (TTF)

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-3432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr updated PDFBOX-3432:
------------------------------------
    Fix Version/s:     (was: 2.0.3)
                   2.0.4

> 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: 2.0.1, 2.0.2, 2.0.3
>         Environment: Ubuntu 14.04.4 LTS
>            Reporter: Michael Doswald
>            Priority: Trivial
>              Labels: optimization, performance
>             Fix For: 2.0.4, 2.1.0
>
>         Attachments: PDFBOX-3432_Optimize_CID_to_GlyphId_mapping_rev1.patch, fontbox-benchmark-CustomMap-VS-GSCollections.zip, patch_for_CustomMap_VS_GSCollections_benchmark.patch, pdfbox-performance-PDFBOX-3432.zip
>
>
> 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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