* Add ImageMagick 7 compatibility
A new header, `imclude/MagickUtilities.h`, is created to hold the
compatibility `#define`s.
The image-conversion code in `src/Frame.cpp` received the only
major changes — instead of doing the export by hand (and having
to account for changes in the underlying API), it uses the
`MagickCore::ExportImagePixels()` function which does basically
the same work, but accounts for all of the API changes for us.
The API of that function is _unchanged_ from IM6 to IM7.
TODO: `MagickCore::ExportImagePixels()` will return an `exception`
struct if it encounters any problems. Currently the code ignores
that, which it should not.
* Add ImageMagick 7 compatibility
A new header, `imclude/MagickUtilities.h`, is created to hold the
compatibility `#define`s.
The image-conversion code in `src/Frame.cpp` received the only
major changes — instead of doing the export by hand (and having
to account for changes in the underlying API), it uses the
`MagickCore::ExportImagePixels()` function which does basically
the same work, but accounts for all of the API changes for us.
The API of that function is _unchanged_ from IM6 to IM7.
TODO: `MagickCore::ExportImagePixels()` will return an `exception`
struct if it encounters any problems. Currently the code ignores
that, which it should not.
Thanks @ferdnyc
`Json::Reader` has been deprecated for some time, so we replace it with
`Json::CharReader` generated by a `Json::CharReaderBuilder`, or (in the
one instance where we have a stream as input) `Json::parseFromStream();`
