Rosalind Douglas created PDFBOX-4615:
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Summary: AppearanceGeneratorHelper.setAppearanceValue doesn't set
the bounding box on the appearance stream correctly
Key: PDFBOX-4615
URL: https://issues.apache.org/jira/browse/PDFBOX-4615
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 2.0.16
Reporter: Rosalind Douglas
Attachments: flattenedboundingbox.pdf, resetboundingbox.pdf
Hello, thanks for all your effort with PDFBox. We use it heavily for parsing
and flattening PDFs.
In the attached PDF "resetboundingbox.pdf", we programmatically set the value
of the text fields, then call pdAcroForm.flattten(), which produces the
flattened PDF "flattenedboundingbox.pdf." I would expect that the text would
entirely fill the text box (see textbox with green border in
"flattenedboundingbox.pdf") but the text does not. Instead, the filled text
area obeys another box instead (see text area with red border in
"flattenedboundingbox.pdf").
We've traced the problem to AppearanceGeneratorHelper.setAppearanceValue, lines
200-210. As long as we always set the bounding box (line 243) like in
AppearanceGeneratorHelper.prepareNormalAppearanceStream, regardless of the
if/else at line 200, then the flattening works correctly:
{code:java}
/** * replace AppearanceGeneratorHelper lines 199-210 with: */
PDAppearanceStream appearanceStream = appearance != null &&
appearance.isStream() ? appearance.getAppearanceStream() :
prepareNormalAppearanceStream(widget);
// copied from lines 237-243
int rotation = resolveRotation(widget);
PDRectangle rect = widget.getRectangle();
Matrix matrix = Matrix.getRotateInstance(Math.toRadians(rotation), 0, 0);
Point2D.Float point2D = matrix.transformPoint(rect.getWidth(),
rect.getHeight());
PDRectangle bbox = new PDRectangle(Math.abs((float) point2D.getX()),
Math.abs((float) point2D.getY()));
appearanceStream.setBBox(bbox);
appearanceDict.setNormalAppearance(appearanceStream);
{code}
Something I'm not sure about: in method prepareNormalAppearanceStream, there is
additional code for setting the matrix (lines 245-251), which we don't seem to
need. Since it doesn't break anything, we just keep it too.
Thanks again for your help!
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