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Posted to dev@pdfbox.apache.org by "Tres Finocchiaro (Jira)" <ji...@apache.org> on 2020/03/25 17:42:00 UTC
[jira] [Commented] (PDFBOX-4709) PDFBox prints text poorly in
comparison to Adobe, Chrome, other apps
[ https://issues.apache.org/jira/browse/PDFBOX-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066912#comment-17066912 ]
Tres Finocchiaro commented on PDFBOX-4709:
------------------------------------------
The above issue has an update on this. I'm quoting it here for those interested:
{quote}This issue seems to be caused by precision loss in [WPrinterJob.lineTo|https://github.com/AdoptOpenJDK/openjdk-jdk11u/blob/5f01925b80ed851b133ee26fbcb07026ac04149e/src/java.desktop/windows/classes/sun/awt/windows/WPrinterJob.java#L1458] which maps to [wingdi.h LineTo|https://docs.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-lineto]. In all of the jni functions, floats are passed, but in native, only ints and longs are accepted. This causes each node to 'snap to' an integer value, this includes bezier curve control points. The \{{drawString }}function utilizes the wingdi TextOut function and is unaffected due to the text never being converted to curves, It is simply saved as text and the recipient renders it.
Unfortunately this issue seems to be caused by limitations within windgi rather than a flaw in its java implementation. I do not know much about the topic, but perhaps an alternative could be used.
{quote}
Some ideas proposed are to use GDI+ (which supports the floating point precision) or to force the existing GDI implementation to use a more accurate [MapMode|https://www-user.tu-chemnitz.de/~heha/petzold/ch05f.htm] both of which require changes to the JVM.
In addition to this, I'm in the final phases of a new JDK support contract in place so that we can get upstream JDK resources dedicated.
> PDFBox prints text poorly in comparison to Adobe, Chrome, other apps
> --------------------------------------------------------------------
>
> Key: PDFBOX-4709
> URL: https://issues.apache.org/jira/browse/PDFBOX-4709
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.14
> Environment: Windows 10
> AdoptOpenJDK 11
> PDFBox 2.0.14
> Reporter: Lite M Finocchiaro
> Priority: Major
> Labels: Zebra
> Attachments: Adoberesult.jpg, Drug-print.pdf, Drug-print.pdf, IMG_20191219_130048_2.jpg, PDFBoxVSgraphicsobj.jpg, PDFBoxresult.jpg, PrintedWithPDFBox.pdf, Screen Shot 2019-12-22 at 2.20.54 PM.png, Screen Shot 2019-12-22 at 2.21.00 PM.png, linux-thermal-test-graphics-frc-4pt.pdf, linux-thermal-test-graphics-frc.pdf, linux-thermal-test-pdfbox-4pt.pdf
>
>
> When printing a PDF from PDFBox to a Zebra GK420d thermal label printer, the text from the PDF is blurry and appears to have the top and bottom cut off compared to printing the same file through Adobe Acrobat.
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