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Posted to dev@pdfbox.apache.org by "Pei-Tang Huang (JIRA)" <ji...@apache.org> on 2014/10/24 09:14:34 UTC
[jira] [Comment Edited] (PDFBOX-2450) RenderingHints of PageDrawer
should be customizable
[ https://issues.apache.org/jira/browse/PDFBOX-2450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14182519#comment-14182519 ]
Pei-Tang Huang edited comment on PDFBOX-2450 at 10/24/14 7:13 AM:
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!dot_matrix_output.jpg|width=600px!
Anti-alias make dot matrix printer use dithering.
was (Author: tan9):
Anti-alias make dot matrix printer use dithering
> 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
> Labels: PageDrawer, RenderingHints,
> Attachments: dot_matrix_output.jpg
>
>
> 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 {
> // proxy graphics, applying hints immediately, suppress all subsequent setRenderingHint request
> Graphics2D hintsAppliedGraphics = new HintsAppliedGraphics2D(graphics, hints);
> super.renderPageToGraphics(pageIndex, hintsAppliedGraphics, scale);
> }
> {code}
> It will be nice if there exist a more elegant way to specify {{RenderHint}} s.
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