Thread: I managed to trigger a very interesting bug... :)
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Old 12-24-2017, 11:44 PM   #46
davidfor
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Quote:
Originally Posted by compurandom View Post
I claim that if the epub has a cover image but not a (marked) cover page, and the extended driver doesn't generate a wrapper cover page during translation, it is a bug, as this is a clear difference between epubs and kepubs that it should fix.
Well your claim is WRONG! How many times must I say this: There is nothing in the kepub specs that say this is mandatory. Please read them and tell me where it says something different.

Quote:
Everything else I agree with you, it's a feature request.

Some preliminary results from my checks...
I used quality check to search for books without a replacable cover.
Any particular reason you ignored the other check that I suggested? The one that I actually suggested first and then added the "replaceable cover" check. And in fact, suggested using the two together?

Quote:
It found 500 books as follows:
399 either are marked as or are likely to contain only a single xhtml file (will check these later)
101 were left that needed checking

A lot had unmarked covers and after marking the covers, quality check now says they have replacable covers. So, to answer davidfor's question directly: Yes, I found one piece of software at least that uses the cover page: quality check.
Oh, wow, you found a validation routine that came close to proving I was wrong. Clumsy me for asking a bad question. How about answering the question I was really asking: Tell me about a reading application or device that uses the "cover" type on an XHTML file. Or even something that doesn't run in calibre context.

Quote:
I've found two books (I think) so far that even after marking their cover page, quality check says it isn't removable. Perhaps worthy of investigation later, but it's a small number so far so perhaps not.

Some of the epubs with unmarked cover pages were probably originally single html files that calibre split when converting to an epub, and (coincidentally?) split the cover page as a separate file.
And if you go back and read my suggestion, you will see that I was in no way suggesting the suggested checks would be accurate. All I was suggesting was that they might be a way to reduce the number to check. But, if you want accuracy, than anything with a calibre SVG will do what you want. Anything else is suspect.
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