[
https://issues.apache.org/jira/browse/PDFBOX-6156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tilman Hausherr updated PDFBOX-6156:
------------------------------------
Summary: RegionBitmap blitd slithly too large (was: RegionBitmap bltd
slithly too large)
> RegionBitmap blitd slithly too large
> ------------------------------------
>
> Key: PDFBOX-6156
> URL: https://issues.apache.org/jira/browse/PDFBOX-6156
> Project: PDFBox
> Issue Type: Sub-task
> Components: JBIG2
> Affects Versions: 3.0.4 JBIG2
> Reporter: Tilman Hausherr
> Priority: Major
> Attachments: bitmap-composite-and-xnor.pdf,
> bitmap-composite-and-xnor.png
>
>
> The result rendering looks like this:
> !bitmap-composite-and-xnor.png!
> The xnor is detected and works properly, the real cause is that we have a
> white region (on the left) that has the width 141, but the actual width after
> the blt operation is 144. It turns out that 144 is a multiple of 8 so
> {{Bitmaps.blit()}} botches the last byte somehow.
> Another thing I learned while working on this is that in the specification, 0
> is white and 1 is black. The page starts with default 1 = all black. So the
> chaos starts when the next region image (on the right) is blited with xor on
> the white stripe, resulting in a black stripe.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
