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https://issues.apache.org/jira/browse/PDFBOX-5966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17933547#comment-17933547
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Tilman Hausherr commented on PDFBOX-5966:
-----------------------------------------
My observations debugging this:
In {{applySoftMaskToPaint}} the image created contains a shading.
{{transparencyGroup.getBounds()}} returns
{{{}[x=0.0,y=686.0,w=125.0,h=106.0]{}}}. The y value has a bad influence in the
{{SoftMaskSoftPaintContext.getRaster()}} method (it is used for
{{{}bboxDevice{}}}), because there {{y1}} becomes a negative value and the
pixels are never within mask bounds.
{{transparencyGroup.getBounds()}} has a TODO comment, and seems also suspicious
in that it uses the pageSize. Maybe that isn't correct when it's in a softmask
nested in a pattern. Or maybe it's correct but the y-axis flip shouldn't be
applied ({{flipTG}} field).
> Rendered PDF is missing shading pattern graphics
> ------------------------------------------------
>
> Key: PDFBOX-5966
> URL: https://issues.apache.org/jira/browse/PDFBOX-5966
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.33, 3.0.4 PDFBox
> Reporter: Roderick McMullen
> Priority: Minor
> Attachments: PDFBOX-5966-p4-reduced-bad.pdf,
> PDFBOX-5966-p4-reduced-bad2.pdf, PDFBOX-5966-p4-reduced-good.pdf,
> issuedFilePDF.pdf, issuedFilePDF.pdf-page1.png,
> screen-capture-issuedFilePDF-page1-acrobatreader.png
>
>
> Rendering pages from [^issuedFilePDF.pdf] (e.g. first page) results in
> missing shading pattern behind the line numbers.
> Expected: [^screen-capture-issuedFilePDF-page1-acrobatreader.png]
> Actual: [^issuedFilePDF.pdf-page1.png]
> Code:
> {code:java}
> byte[] fileBytes = Files.readAllBytes(Paths.get(pdfPath));
> DataInputStream data = new DataInputStream(new
> ByteArrayInputStream(fileBytes));
> try (PDDocument pdfboxDocument = PDDocument.load(data)) {
> PDFRenderer renderer = new PDFRenderer(pdfboxDocument);
> renderer.setImageDownscalingOptimizationThreshold(0.2f);
> BufferedImage bim = renderer.renderImageWithDPI(pageIndex, 72,
> ImageType.RGB);
> File outputFile = new File(pngPath);
> ImageIO.write(bim, "png", outputFile);
> }
> {code}
> Is this incorrect pdfbox usage, or is this a pdfbox issue?
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