Pei-Tang Huang created PDFBOX-2450:
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Summary: RenderingHints of PageDrawer should be customizable
Key: PDFBOX-2450
URL: https://issues.apache.org/jira/browse/PDFBOX-2450
Project: PDFBox
Issue Type: Improvement
Components: Rendering
Affects Versions: 2.0.0
Reporter: Pei-Tang Huang
Priority: Minor
RenderingHints defaults are hard-coded in
[PageDrawer|https://github.com/apache/pdfbox/blob/54037862e4c55ab45eb8aecc44b79afbfbcd8dd9/pdfbox/src/main/java/org/apache/pdfbox/rendering/PageDrawer.java#L143-L151]
now.
However, the defaults are not always valid for every situation. For example, I
have a PDF file containing barcodes, which will be printed out using a low
resolution dot matrix printer. The {{RenderingHints.VALUE_ANTIALIAS_ON}}
default confuses all of our barcode reader!
A dirty workaround I had is to extend {{PDFPrinter}}, use reflection to set the
{{protected}} but {{final}} {{super.renderer}} field with following extension:
{code:java}
@Override
public void renderPageToGraphics(int pageIndex, Graphics2D graphics, float
scale)
throws IOException {
Graphics2D hintsAppliedGraphics = new HintsAppliedGraphics2D(graphics,
hints);
super.renderPageToGraphics(pageIndex, hintsAppliedGraphics, scale);
}
{code}
Where the HintsPredefinedGraphics2D is a proxy to the original Graphics2D,
applying the given {{RenderingHints}} immediately and will suppress all
subsequent {{setRenderingHints}} / {{setRenderingHint}} request from
{{PageDrawer}}.
I will be appreciated if there is a more elegant way to specify {{RenderHint}}
s.
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