Burlock, Craig (SAPOL) wrote:
I'm trying to produce a pdf document that contains dynamically generated jpeg images. The images are available within the session. I'm using a cocoon pipline match to serialise xsl-fo into pdf documents.I had the same problem, for different purpose (we need to pass a lot of data to cocoon and GET is to much limited and POST is not yet supported by map:action request). So we had to invent a workaround.
I've explored the following options:
1.) Creating a cocoon servlet to stream back the image data. This work fine for images within HTML document. When I reference the servlet from an xsl-fo image source, my session is unavailable and only a new session accessible .
I created a sort of cache class that contains the data accessible via a singleton class (.getInstance()).
Session problem is no more a problem (except if you have stranger filters), just load into the cache your jpeg stream and affect an ID
and create a servlet that serve the stream from cache and not the session from the ID passed via the request.
It's like creating a master session serving generic data to everyone if it has the proper generated ID.
After you have to think about how and when you clean the cache, it is up to you.
Hope it helps.
David.
2.) Create a cocoon generator to turn jpeg image binary into a b|ase64 encoded string and embed this string within an instream-foreign-object using svg. This method produces visible images, but the final pdf document is huge. It's like the jpeg compression is being translated into an uncompressed bitmap.
<fo:instream-foreign-object content-type="content-type:image/jpeg">
<svg:svg height="176mm" width="277mm">
<svg:image width="277mm" height="176mm" x="0" y="0" xlink:href="data:image/jpeg;b|ase64, /9j/4AAQSkZJRgABAQAAAQAgLCgoL . . . ." />
</svg:svg>
</fo:instream-foreign-object>
I've already spent too much time trying to get this working. I've found some references to this type of issue in other mail a rchives, but the responses I've seen have been very vague. I'll be forced to drop using pdf reports and use ugly html if I can't resolve this very soon.
If anyone has a solution that they have tried, please let me know. I'd hate to abandon fop and produce nasty html reports after getting this far!
Please help
Craig.
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