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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2015/09/07 18:49:45 UTC
[jira] [Updated] (PDFBOX-2962) Handle TIFF predictor for bpc 2 and
4 / optimiz existing predictor code
[ https://issues.apache.org/jira/browse/PDFBOX-2962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tilman Hausherr updated PDFBOX-2962:
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Summary: Handle TIFF predictor for bpc 2 and 4 / optimiz existing predictor code (was: Handle TIFF predictor for bpc 2 and 4 / optimizing existing predictor code)
> Handle TIFF predictor for bpc 2 and 4 / optimiz existing predictor code
> -----------------------------------------------------------------------
>
> Key: PDFBOX-2962
> URL: https://issues.apache.org/jira/browse/PDFBOX-2962
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 1.8.10, 1.8.11, 2.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 1.8.11, 2.0.0
>
>
> I created code that will work for TIFF predictors with bpc 2 and 4. Because there are no test images, the code is written so that it can work with bpc 1, 2, 4 and 8 (but not 16) and has been tested on what we have, which are the corner cases bpc 1 and 8. The bit sequence retrieval / assignment methods have tests so the risk is small.
> If anyone wants to optimize the new code, it should be retested with the same method, i.e. disable the (faster) code for bpc 1 and 8. And if it comes out that optimization went wrong, we'll still have this code as a fallback. However optimization isn't really needed, almost all files "in the wild" are bpc 8.
> I also did some slight optimizations of the existing code, {{p - bytesPerPixel >= 0 ? ...}} can be removed by starting the for loop at {{bytesPerPixel}}.
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