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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2017/12/15 15:53:00 UTC
[jira] [Commented] (PDFBOX-4038) CFF font Blue values and other
delta encoded lists read incorrectly
[ https://issues.apache.org/jira/browse/PDFBOX-4038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292700#comment-16292700 ]
Tilman Hausherr commented on PDFBOX-4038:
-----------------------------------------
I agree that our code is incorrect. But I doubt that the result values must have an increasing order - have a look at the file CourierStd.otf. The delta values could be positive or negative. For this font, the values are [-14, 0, 572, 585, 434, 448, 782, 803, 626, 626] with your change and also in DTL OTMaster 3.7 light (I deinstalled FontForge because I didn't like its UI).
> CFF font Blue values and other delta encoded lists read incorrectly
> -------------------------------------------------------------------
>
> Key: PDFBOX-4038
> URL: https://issues.apache.org/jira/browse/PDFBOX-4038
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 2.0.8
> Reporter: Petr Slaby
> Fix For: 2.0.9, 3.0.0 PDFBox
>
> Attachments: BlueValuesTest.java, CFFParser.java.patch
>
>
> The attached test compares the values retrieved via CFFParser from an OpenType font with the expected values as seen in FontForge (go to Element->Font Info->PS Private).
> The font NeoSans Black.otf can be found at https://www.wfonts.com/font/neosans
> The CFF font specification explaining the encoding of the entries which are incorrectly parsed by FontBox CFFParser can be found here https://typekit.files.wordpress.com/2013/05/5176.cff.pdf
> We use FontBox to read the font when we need to embed it into an PDF which we produce via our Apache FOP based software. Adobe validator complains about incorrect "Blue values" sorting then.
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