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

["Michael Doswald (JIRA)" <ji...@apache.org>]

Michael Doswald created PDFBOX-3421:
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             Summary: 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


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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