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