[ 
https://issues.apache.org/jira/browse/PDFBOX-3432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15397167#comment-15397167
 ] 

Michael Doswald commented on PDFBOX-3432:
-----------------------------------------

The benchmark compares the GS Collections implementation against the simple 
implementation I added in the first patch. The if-else code is just there for 
the test and is not meant to be added in the final solution. 

I am currently pretty busy with other things that's why I didn't follow up on 
this. I'll perform some more tests as soon as I get some more time to spare.

> 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: 2.0.3, 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org
For additional commands, e-mail: dev-h...@pdfbox.apache.org

Reply via email to