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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