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

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

John Hewson created PDFBOX-2302:
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             Summary: 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


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 too 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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