[
https://issues.apache.org/jira/browse/PDFBOX-2423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234482#comment-14234482
]
Tilman Hausherr commented on PDFBOX-2423:
-----------------------------------------
The file http://www.pdflib.com/fileadmin/pdflib/Cookbook/pdf/color_gradient.pdf
doesn't render:
{code}
java.lang.NullPointerException
at org.apache.pdfbox.util.Matrix.concatenate(Matrix.java:195)
at org.apache.pdfbox.util.Matrix.concatenate(Matrix.java:441)
at org.apache.pdfbox.rendering.PageDrawer.getPaint(PageDrawer.java:242)
at
org.apache.pdfbox.rendering.PageDrawer.getNonStrokingPaint(PageDrawer.java:498)
at
org.apache.pdfbox.rendering.PageDrawer.drawGlyph2D(PageDrawer.java:346)
at
org.apache.pdfbox.rendering.PageDrawer.showFontGlyph(PageDrawer.java:306)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.showGlyph(PDFStreamEngine.java:760)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.showText(PDFStreamEngine.java:719)
at org.apache.pdfbox.rendering.PageDrawer.showText(PageDrawer.java:288)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.showTextStrings(PDFStreamEngine.java:629)
at
org.apache.pdfbox.contentstream.operator.text.ShowTextAdjusted.process(ShowTextAdjusted.java:38)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:829)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:497)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:463)
at
org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:178)
at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:163)
at
org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:213)
at
org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:147)
at
org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:82)
at
org.apache.pdfbox.util.TestPDFToImage.doTestFile(TestPDFToImage.java:235)
at
org.apache.pdfbox.util.TestPDFToImage.testRenderImage(TestPDFToImage.java:354)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at junit.framework.TestCase.runTest(TestCase.java:176)
at junit.framework.TestCase.runBare(TestCase.java:141)
at junit.framework.TestResult$1.protect(TestResult.java:122)
at junit.framework.TestResult.runProtected(TestResult.java:142)
at junit.framework.TestResult.run(TestResult.java:125)
at junit.framework.TestCase.run(TestCase.java:129)
at junit.framework.TestSuite.runTest(TestSuite.java:255)
at junit.framework.TestSuite.run(TestSuite.java:250)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at junit.textui.TestRunner.start(TestRunner.java:183)
at junit.textui.TestRunner.main(TestRunner.java:137)
at org.apache.pdfbox.util.TestPDFToImage.main(TestPDFToImage.java:404)
{code}
Likely because shadingPattern.getMatrix() can return null.
> Page tree handling needs rewriting
> ----------------------------------
>
> Key: PDFBOX-2423
> URL: https://issues.apache.org/jira/browse/PDFBOX-2423
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 1.8.7, 2.0.0
> Reporter: John Hewson
> Assignee: John Hewson
> Priority: Blocker
> Fix For: 2.0.0
>
> Attachments: 025957.pdf, 26101_Colors.ai-1.png,
> 26101_Colors.ai-1.png-diff.png, Basiswissen-Vorschriften.pdf-3.png,
> Basiswissen-Vorschriften.pdf-3.png-diff.png,
> Basiswissen-Vorschriften.pdf-4.png,
> Basiswissen-Vorschriften.pdf-4.png-diff.png, PDFBOX-1058.pdf-1.png,
> PDFBOX-1058.pdf-1.png-diff.png, PDFBOX-1058.pdf-4.png,
> PDFBOX-1058.pdf-4.png-diff.png, PDFBOX-1094-tiling_pattern.pdf,
> PDFBOX-1711-cmyk.pdf-1.png, PDFBOX-1711-cmyk.pdf-1.png-diff.png,
> PDFBOX-1794-vattenfall.pdf-1.png, PDFBOX-1794-vattenfall.pdf-1.png-diff.png,
> PDFBOX-1917.pdf-1.png, PDFBOX-1917.pdf-1.png-diff.png,
> asy-functionshading.pdf-1.png, asy-functionshading.pdf-1.png-diff.png,
> bugzilla869140.pdf, example_026.pdf-1.png, gs-bugzilla694385.pdf,
> jagpdf_doc_patterns.pdf
>
>
> The way in which PDFBox handles the Page tree needs to be rewritten,
> preferably from scratch. Currently the document catalog returns the raw
> objects from the page tree, wrapped in either a PDPage or PDPageNode.
> We need to abstract over the page tree and get rid of PDPageNode, we should
> provide methods which can add/remove PDPage objects *only*. The existing
> low-level access to the page tree is not needed at the PD-level.
> Inheritance of page properties such as crop box, resources, and rotation
> should be reimplemented to use whatever new page tree abstraction we invent.
> We can finally remove the old broken methods which didn't look up the
> inheritance tree when retrieving these values.
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