GitHub user monejava opened a pull request:
https://github.com/apache/fop/pull/3
FOP-1969: Surrogate pairs not treated as single unicode codepoint forâ¦
Implemented correct handling of surrogate pairs in ApacheFOP. The supported
Renderes are PDF, PS and PNG. Tests implemented when it was possible.
Here a brief explanation of the design choice that I have made to modify
the public API:
`mapChar(char)`/`hasChar(char)`: are defined in `Typeface` which means that
they have more then 20 implementations. Modify this interface would require lot
of work and might introduce lot of bugs. That's why Glenn Adams (our contact in
ApacheFOP project) asked us to create new methods rather the existing ones. In
some of these implementations, such as `SingleByteFont`, is semantically
correct to have a character represented by a single UTF-16 character. In some
other implementation such as `CIDFont`
(http://www.adobe.com/products/postscript/pdfs/cid.pdf) is not since they are
meant to cover a wider range then 2^16 characters.
`mapCodePoint(int)`/`hasCodePoint(int)`: I have added these 2 methods to
the `CIDFont` class that uses int (code points) instead of char so that we can
cover the full Unicode range. As you can see from the `Typeface` hierarchy this
change affect only 2 classes.
`getUnicode()`: is defined in `CIDSet` (is not a property of the `Typeface`
class or one of its subclasses). I changed the firm of this method to handle
int instead of char because it is semantically incorrect to represent unicode
with a single UTF-16 char. As you can see from the `CIDSet` hierarchy the
change affect only 3 classes.
`getUnicodeFromGID()`: this method is defined in `CustomFont` and `CIDSet`.
It never get called from the `MultiByteFont` path, probably becuase getUnicode
is used instead. That is why I'm down casting the return value from int to char
in `CIDFull` and `CIDSubset`. Probably the best thing to do would be to get rid
of this method or make it handle int, but again the change would affect more
classes then the ones in our scope.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/monejava/fop surrogate_pairs
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/fop/pull/3.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3
----
commit 111d6a6fa58c313293e9b79e245c8521778de2c8
Author: Rondelli <[email protected]>
Date: 2016-09-19T15:13:09Z
FOP-1969: Surrogate pairs not treated as single unicode codepoint for
display purposes
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