I have focused on the 1st issue I found. May be there are other issues behind.

Le 01/06/2012 18:13, Rob Sargent a écrit :
Thanks Pascal,

Sort of glad to know it's not just me! Unfortunately I don't think you
example minimal fo actually recreates my problem. I'm trying to get the
"gallery" page to have NO text at all, whereas you working example has
two line of text on the "gallery" page. The best I have attained is a
single line of text on my gallery page by dialing in the margin-top to
10.82in (10.83in generates the same exception, using 10.5 pt

With the XSL-FO attached to my previous email FOP throws a FOPException, and produces no output. I've set both font-size and line-height to 1in (on fo:root), and the available b-p-d of the 1st page body is less than 2in (page-height="11in" - body/@margin-top="9in + 0.001pt"), so there is no place for line break. Can you check again that you tried that example?

I should mention that in our production situation the textless gallery
pages work just fine, except when preceded by our "three-side" layout.
We have two symptoms: aside from the FOPException reported, in some
cases a single line of text appears on the gallery page. Since, as I've
said, I believe these two cases are related I have not generate the
'single line of text' example. That has it's own interesting story which
I will refrain from telling at this time, except to confess the actual
page-layout dimensions for the gallery pages:

<fo:simple-page-master page-width="8.5in" page-height="11in"
master-name="gallery6-page-3" margin="0.0in 0.0in 0.6in 0.833in">
<fo:region-body margin-top="10.0in" margin-right="0.70in"
margin-bottom="0.40in" column-gap="0.40in" column-count="2" />
<fo:region-before precedence="true" extent="9.0in"
region-name="header-gallery6-page-3" />

for the body of gallery6-page-3:
b-p-d is 11in - 0 - 0.6in - 10in - 0.4in = 0,
so, in case of multi-line content, there is no room for line-break, that cause a FOP exception if i-p-d changes on next page (this is a FOP bug).

for each column:
i-p-d = (8.5in - 0 - 0.833in - -0.7in - 0.4in) / 2 = 3.2865in

If you leave a 0 b-p-d to force an empty page, you should ensure that computed i-p-d for the content (here each column) equals the one of the next page, the issue you are facing should not occur.

<fo:simple-page-master page-width="8.5in" page-height="11in"
master-name="three-side-page-11" margin="0.0in 0.0in 0.6in 0.833in">
<fo:region-body margin-top="0.75in" margin-right="4.3585in"
column-count="1" />
<fo:region-before region-name="default-right-header" precedence="true"
extent="0.50in" />
<fo:region-end extent="3.465in" region-name="three-side-start-11" />

Please advise as to how to procede. Happy to register the failure you've
isolated (though I don't understand why the "fail" case doesn't generate
one-line of text on the first page?).Should I enter another on the
negative interplay of the two page layouts?

On 06/01/2012 03:15 AM, Pascal Sancho wrote:
Hi Rob,

sure you are facing a bug:
when there is no room on 1 page to insert a line-break, then, if IPD
change on next page, the described FOPException is thrown.

See the attached minimal XSL-FO: when you remove the expression
" + 0.001pt" from the margin-top value, it works like charm.

Can you please fill in a bug on FOP bug list, attaching this minimal

As a workaround, you should decrease the margin-top of your
simple-page-master "gallery6-page-3" (leaving room for 2 * line-height,
and/or add a break-before on the %block% that come in 1st place of
your page 4.

Le 01/06/2012 04:00, Rob Sargent a écrit :
We're using FOP-1.0.

Admittedly it may be a stretch to call these "simple" page layouts but
the attached FOs show that the ordering of the page layouts can cause
the generation of the pdf to fail. The fo-fails.xml exists with

Caused by: java.lang.UnsupportedOperationException: Don't know how
to restart at positionNonLeafPos:927(Flow@61f93f69[@id=]],
NonLeafPos:399(BlockContainer@52ab9d99[@id=group-Normal Development
and Anatomy of the Cerebral Commissures]],
NonLeafPos:7(Block@58a2b90b[@id=]], LeafPos:-1(pos=29,
at org.apache.fop.layoutmgr.PageBreaker.doLayout(PageBreaker.java:85)
at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:177)
at org.jdom.output.SAXOutputter.endElement(SAXOutputter.java:1046)
at org.jdom.output.SAXOutputter.element(SAXOutputter.java:903)
at org.jdom.output.SAXOutputter.elementContent(SAXOutputter.java:1093)
at org.jdom.output.SAXOutputter.elementContent(SAXOutputter.java:1067)
at org.jdom.output.SAXOutputter.element(SAXOutputter.java:897)
at org.jdom.output.SAXOutputter.output(SAXOutputter.java:621)
... 7 more

Some explaintion of the intent: The "three-side-page-*" s-m-ps usurp a
two-column text xsl-region body placing a static region over one of the
columns and the gallery6-page-* attempt to set the size of the
region-body to zero (creating a 'text-less' page).

Note that the gallery6-page-* layout was recently reworked to be
textless. Prior to that (developed originally in FOP-0.95) we had an
inch of text available and detected no order dependency amongst the
orderings of layouts.

And yes the s-m-ps are generated on the fly by the xsl translation,
whereby a static page definitions is loaded into a page-number specific
master, also left/right adjusted.

Furthermore, in other we also experience a single line of text on the
gallery6-page-*s only when preceded by a three-side-page-* s-m-p. If
necessary I will report that as a separate issue, but at this point I'm
hoping both symptoms are tightly related.

Any work-around much appreciated. If requested, I'm more than willing to
report this as a bug. Unfortunately we cannot wait for FOP-1.1 but we
could run off the trunk.

As I see it the diffs in the two attached FO's are entirely in the
static-regions as one would expect.

We're at crunch time and could go back to the original definition of
gallery6-page* but would /really/ rather not.


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