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From "Petr Slaby (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-2104) Implement transparency groups
Date Mon, 16 Jun 2014 11:44:01 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032363#comment-14032363
] 

Petr Slaby commented on PDFBOX-2104:
------------------------------------

I have refactored the code according to your suggestions. Only
{quote}
* In PageDrawer the following graphics state is constructed, but it is never used: 
....
{quote}

This code does not construct a new graphics state, it changes some settings in the current
one. 

> Implement transparency groups
> -----------------------------
>
>                 Key: PDFBOX-2104
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2104
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: Petr Slaby
>            Assignee: John Hewson
>         Attachments: 000001_MTEXT_CS6.pdf, TransparencyGroups.1.patch, TransparencyGroups.2.patch,
TransparencyGroups.3.patch, TransparencyGroups.patch
>
>
> The attached PDF uses transparency groups, blending and soft masks to create the rounded
corners and shades behind images. It appears that these features are not implemented in PDFBox.
An implementation proposal is attached in the TransparencyGroup.patch. The basic idea is to
create a buffered image, draw the transparency group content onto it and then use the result
to produce the soft mask or draw the image on the original g2d.
> Note: I am not the (only) author of the proposed change. It was developed in our company
few years ago in sources based on a 1.7.x version of PDFBox, mostly by a guy who already left.
Over the years, merging of the work done in PDFBox main stream into our source base has become
impossible due to many refactorings and other deep going changes done. Now we would like to
go the opposite way - where possible - bring the changes and fixes we have done into PDFBox
main stream and start to use it in our installations.



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