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Posted to dev@pdfbox.apache.org by "John Hewson (JIRA)" <ji...@apache.org> on 2014/09/03 02:30:51 UTC
[jira] [Comment Edited] (PDFBOX-2302) Make better use of
RenderingHints
[ https://issues.apache.org/jira/browse/PDFBOX-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14119054#comment-14119054 ]
John Hewson edited comment on PDFBOX-2302 at 9/3/14 12:30 AM:
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The FORIS file renders perfectly for me at any DPI, nice readable anti-aliased street names.
was (Author: jahewson):
The FORIS file renders perfectly for me at any DPI, nice crisp readable anti-aliased street names.
> 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-1691-FORIS-HV.pdf-2.png, PDFBOX-1691-FORIS-HV.pdf-2.png, PDFBOX-1691-FORIS-HV2-good.png, PDFBOX-1691-FORIS-HV2-poor.png, 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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