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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2016/07/19 16:05:20 UTC

[jira] [Resolved] (PDFBOX-3421) Optimize float to string conversion in PDAbstractContentStream

     [ https://issues.apache.org/jira/browse/PDFBOX-3421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr resolved PDFBOX-3421.
-------------------------------------
       Resolution: Fixed
         Assignee: Tilman Hausherr
    Fix Version/s: 2.1.0
                   2.0.3

Setting to resolved. Thanks for the contribution!

> Optimize float to string conversion in PDAbstractContentStream
> --------------------------------------------------------------
>
>                 Key: PDFBOX-3421
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3421
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: PDModel
>    Affects Versions: 2.0.2, 2.0.3, 2.1.0
>         Environment: Ubuntu 14.04
>            Reporter: Michael Doswald
>            Assignee: Tilman Hausherr
>            Priority: Trivial
>              Labels: optimization, performance
>             Fix For: 2.0.3, 2.1.0
>
>         Attachments:  PDFBOX-3421_Float_formatting_performance_rev2.patch, PDFBOX-3421_Float_formatting_performance_rev1.patch, PDFBOX-3421_Float_formatting_performance_rev3.patch, PDFBOX-3421_Float_formatting_performance_rev4.patch, pdfbox-performance-floatformat.zip
>
>
> Drawing lines in a PDF (and also other operations) writes the coordinates to the content stream. Currently, the PDAbstractContentStream#writeOperand(float) method uses the NumberFormat class to convert the float values. This is inefficient for multiple reasons:
> * NumberFormat is designed to format numbers locale dependent. That is not needed in this case
> * NumberFormat uses a pattern to format the value which is also not needed in this case
> * The formatting first creates a String object, converts it to a byte array with ASCII encoding and then writes it to the stream. This generates a lot of garbage.
> A different approach to formatting real operands should be used.



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