[jira] [Created] (PDFBOX-2450) RenderingHints of PageDrawer should be customizable

["Pei-Tang Huang (JIRA)" <ji...@apache.org>]

Pei-Tang Huang created PDFBOX-2450:
--------------------------------------

             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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