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https://issues.apache.org/jira/browse/PDFBOX-2127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler reassigned PDFBOX-2127:
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Assignee: Andreas Lehmkühler
> Optimize calls of getPixel in SampledImageReader and PDImageXObject
> -------------------------------------------------------------------
>
> Key: PDFBOX-2127
> URL: https://issues.apache.org/jira/browse/PDFBOX-2127
> Project: PDFBox
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: Petr Slaby
> Assignee: Andreas Lehmkühler
> Attachments: 000048.pdf, GetPixel.patch
>
>
> When calling Raster#getPixel() in a loop, it is a good practice to make sure
> that the result array is allocated only once.
> SampledImageReader#getStencilImage() and PDImageXObject#applyMask() fail to
> do that. When rendering the attached example, this results in allocating 24
> 053 760 arrays containing 3 floats, which is about 0.5GB of data if my math
> is right. Also, I have noticed that SampledImageReader#getStencilImage()
> reads and sets the same data w/o modification if alpha of a pixel != 255.
> After applying the attached patch, rendering time of the document drops from
> 8.5s to 7.4s. Not as much as I have expected - array allocation and the
> garbage collector seem to be fast - but still...
> Note: Rendering of the document is wrong, it does not find some of its fonts,
> but that is irrelevant for this issue.
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