[xep-support] Making XEP fail when an image cannot be rendered

[David Cramer]

Alexei Gagarinov wrote:
> Hi David,
>
>> If you have an image in your fo source that is sized such that it 
>> does not fit on the page because it is too wide but not too tall, xep 
>> renders the image but it extends off the page to the right. If you 
>> have an image that is too tall, xep does not render the image, but 
>> just leaves a blank space where the image would go. In neither case 
>> is there any message in the xep log file. Is it possible to have xep 
>> fail if it cannot render an image? Having it quietly create a bad pdf 
>> is dangerous. It's preferrable to me to have it fail if something 
>> like that goes wrong so I can fix it.
>
> There are 2 approaches for this problem:
> 1) Design your own application over XEP (using XEP API) and implement 
> a custom logger that extends com.renderx.xep.lib.Logger class.
>
> You can filter different errors in the overridden error() method (and 
> use System.exit for image's errors, for example).
>
> 2) Postprocess -- using any script programming language and an 
> appropriate filter -- the error log of the XEP's rendrering (and 
> delete the resulting files that contain "bad" output, for example).
>
> Regards,
>   Alexey Gagarinov
> RenderX
>
I currently invoke XEP using ant and already use ant's xml logger, so 
running an xslt over it and failing if there's an error output from xep 
would be easy enough., but in the case of the too tall or too wide 
image, there is nothing in the log file.

Thanks,
David
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