Give the AppendDebugMethod() declaration a set of default values for
all parameters after the first. (It uses `""` and `-1.0`, which are
what callers were passing in anyway.) This way, callers have the
_option_ to eschew this kind of thing:
```
ZmqLogger::Instance()->AppendDebugMethod("Message", "start", start,
"length", length, "", -1, "", -1, "", -1, "", -1);
```
instead, they can use the functionally equivalent:
```
ZmqLogger::Instance()->AppendDebugMethod("Message", "start", start,
"length", length);
```
Passing meaningless args is the compiler's job, not the programmer's.
* 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
