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Posted to dev@pdfbox.apache.org by "John Hewson (JIRA)" <ji...@apache.org> on 2016/07/13 17:05:20 UTC
[jira] [Comment Edited] (PDFBOX-3421) Optimize float to string
conversion in PDAbstractContentStream
[ https://issues.apache.org/jira/browse/PDFBOX-3421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15375356#comment-15375356 ]
John Hewson edited comment on PDFBOX-3421 at 7/13/16 5:05 PM:
--------------------------------------------------------------
+1. Indeed, the Adobe PDF SDK uses a 16.16 fixed-point internal representation for floats.
was (Author: jahewson):
+1. Indeed, the Adobe PDF SDK uses a 16.16 fixed point internal representation for floats.
> 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
> Environment: Ubuntu 14.04
> Reporter: Michael Doswald
> Priority: Trivial
> Labels: optimization, performance
> Attachments: PDFBOX-3421_Float_formatting_performance_rev1.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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