Ok... This one's a tricksy little badger. Basically, because you're using a font-size that's so large (especially when you convert pts -> mpts as FOP works in) we're basically seeing an integer-overflow issue:
2579 pts = 2579000 mpts 833mpts = width of "M" glyph in Helvetica In Java (read: 32-bit integers), try 2579000 * 833, the result is -2146660296, it should be 2148307000. This means when FOP attempts to draw the glyphs with the appropriate kerning, an erroneous value is being given as the glyph-width of the "M" character. I'm not really sure if this is a bug, there's always going to be a limitation on the size of the document FOP can produce because we have to work with integers that can overflow, if that limitation is 2147483648 / 1000 / 72 inches (or 29826 inches), I think we have enough scope there to feel assured that we're within the bounds of reasonable use. If you need any help changing your document to be a bit more FOP-friendly, please feel free to ask any further questions and I/we will try and help as much as we can. Hope that helps, Mehdi On 24 September 2012 09:38, mehdi houshmand <med1...@gmail.com> wrote: > Hi Matthias, > > I've just taken a quick look at this and I'm not really sure what you're > attempting to do here. Why have you made the viewBox so large and then put > scale to fit on the "<fo:instream-foreign-object>"? You can reduce the size > of the view box such that you don't need to scale-to-fit the SVG image. Is > there any reason why you're trying to use such large fonts sizes and > drawing space? > > I'm going to look into why the kerning on that "M" is so far off, but you > may be able to work around this issue. > > Thanks > > Mehdi > > On 24 September 2012 03:20, Matthias Reischenbacher > <matthias8...@gmx.at>wrote: > >> Hi, >> >> one of my clients reported a strange problem with SVG text being >> misplaced in PDF output when very high font size values are used. The >> sample SVG file also uses very high viewBox values. I created a test case >> which reproduces the issue when increasing the font size from 2578pt to >> 2579pt: suddenly the characters are misaligned. >> The issue doesn't occur when outputting PNG or PS files, so perhaps this >> is only related to the PDF code. I've been debugging for several hours, but >> I can't find the cause. >> I'm attaching a fo file which reproduces the issue and the current PDF >> output. Perhaps someone can have a look at it and tell me which code part I >> should check, in order to fix the issue. >> >> Thanks for your help. >> >> Best regards, >> Matthias >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org >> For additional commands, e-mail: fop-users-h...@xmlgraphics.apache.org >> > >
