[jira] [Reopened] (PDFBOX-2302) Make better use of RenderingHints

["John Hewson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Hewson reopened PDFBOX-2302:
---------------------------------

Confirmed. It's caused by the background showing through the edge of the anti-aliased rectangles. I'm seeing if Java's compositing can alter this somehow.

> Make better use of RenderingHints
> ---------------------------------
>
>                 Key: PDFBOX-2302
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2302
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.0
>            Reporter: John Hewson
>            Assignee: John Hewson
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: PDFBOX-1794-vattenfall1.jpg, PDFBOX-1794-vattenfall1_before.jpg, bugzilla8677511.jpg, bugzilla8677511_before.jpg, example-striped.pdf, example-striped.pdf-1.png, mori-cvpr01.pdf
>
>
> PageDrawer doesn't make effective use of Java 2D's RenderingHints. The situation now is a little odd due to code having been moved around and copied and pasted. Most of the time we're not making use of higher quality renderings which are available to us.
> Some examples of strangeness:
> - drawTilingPattern sets VALUE_FRACTIONALMETRICS_ON, yet this applies only to AWT fonts
> - drawGlyph2D sets VALUE_ANTIALIAS_ON but strokePath and fillPath set it to VALUE_ANTIALIAS_OFF
> - drawBufferedImage sets KEY_INTERPOLATION to VALUE_INTERPOLATION_NEAREST_NEIGHBOR which is the lowest quality image scaling method
> - shadingFill sets VALUE_ANTIALIAS_OFF (but that might make more sense because we're Paint-ing these ourselves, OTOH if the canvas is buffered already for anti-aliasing do we save anything by disabling it?)
> - drawPage sets VALUE_ANTIALIAS_ON but this is always overridden by the various drawing methods
> Currently we're missing out on anti-aliasing for paths (other than glyphs) and we're getting low-quality resizing of images, which makes Type 3 fonts look particularly ugly. Setting the appropriate rendering hints would improve this greatly.



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