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https://issues.apache.org/jira/browse/PDFBOX-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Schwinn updated PDFBOX-1283:
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Attachment: AnnahmeReport_MitRussischTest.pdf
> Unicode characters displayed with wrong Advance
> -----------------------------------------------
>
> Key: PDFBOX-1283
> URL: https://issues.apache.org/jira/browse/PDFBOX-1283
> Project: PDFBox
> Issue Type: Bug
> Components: PDFReader
> Affects Versions: 1.6.0
> Reporter: Daniel Schwinn
> Attachments: AnnahmeReport_MitRussischTest.pdf
>
>
> The file AnnahmeReport_MitRussischTest.pdf is not displayed correctly. The
> advance of the characters is calculated wrong. The document is displayed
> correctly in Adobe Reader.
> In PDCIDFont.java the method extractWidths() fills widthCache with the
> character widths based on the array in the "W" Dictionary. The widthCache
> seems to translate from from Unicode to character width but the "W"
> Dictionary translates from CID-code to character width.
> In this PDF file the TTF font is embedded and the CID code is identical to
> the glyph code in the TTF font. A cmap maps from unicode directly to the
> cid/gid in the ttf font.
> So this cache is filled in the wrong way or when accessing the cache it is
> not taken into account that this array containes the widths based on the
> cid/gid.
> The cmap encoding has to be used when filling the cache or when reading the
> values from the cache
> I checked if Adobe Reader uses the values in /W to determine the widths to
> rule out the case that
> the PDF file is faulty and adobe reader just ignores the faulty /W array.
> When changing the entries for the glyphs number 20..23 in the /W array of the
> bold font
> (first 4 values in the second line of the array which match to characters
> '1'..'4')
> then the numbers are displayed with wrong widths in AdobeReader while nothing
> changes in PDFBox.
> (file AnnahmeReport_MitRussischTest_Modified.pdf)
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