Robert Meyer created PDFBOX-1645:
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Summary: Improved the accuracy of the bounding box for each
rendered CFF glyph
Key: PDFBOX-1645
URL: https://issues.apache.org/jira/browse/PDFBOX-1645
Project: PDFBox
Issue Type: Improvement
Components: FontBox
Affects Versions: 1.8.2
Reporter: Robert Meyer
Fix For: 2.0.0
In a previous patch to the CharStringRenderer class, I resolved the rendering
issues and added a method to retrieve the bounding box for a CFF glyph. This
utilized the GeneralPath.getBounds() method to retrieve it's bounding box.
Unfortunately it was found that the method uses the control points of the
bezier curves instead of the actual lines and was not very accurate. I have
therefore added several new methods to calculate the correct extents of the
glyph so that now it matches that of the measurements found in tools like
FontForge.
As a side note, there are several checks which were originally added in my
patch which were unfortunately removed relating to the number of arguments
provided with an operator. I have one Adobe Font (Adobe Heiti Standard -
CID-Keyed OTF) which has one or more glyphs which trip up on this and cause an
Array index out of Bounds exception. Each glyph renders correctly even though
this issue occurs and therefore would be grateful if these could be left in. I
have re-added these checks back with the patch I am about to add.
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