[magick-users] Joining 2 image halves (C++ api)

[Anthony Thyssen]

bill_barrington at bellsouth.net on  wrote...
| Hello,
| 
| What I would like to do is very simple. Basically, I would like to use the C++ API to perform the same thing that the following 'convert' command line tool does:
| convert +append lhs rhs joined
| 
| The C++ code follows. It's being called using JNI, hence the jints, etc.  Can someone steer me to the solution?  Thanks.
| 
| 
| jint joinImageHalves(jbyte *lhs, jint lhsLen, jbyte *rhs, jint rhsLen, jbyte* &image) {
|   cerr << "Creating lhs" << endl;
|   Blob lhsBlob((unsigned char*)(lhs), lhsLen);
|   Image lhsImage(lhsBlob);
| 
|   cerr << "Creating rhs" << endl;
|   Blob rhsBlob((unsigned char*)(rhs), rhsLen);
|   Image rhsImage(rhsBlob);
|   
|   Geometry lhsGeom = lhsImage.size();
|   Geometry rhsGeom = rhsImage.size();
|   if(lhsGeom.width() != rhsGeom.width() || lhsGeom.height() != rhsGeom.height()) 
|   	throw invalid_argument("Geometry of image halves differs"); 	
|   int w = lhsGeom.width();
|   int h = lhsGeom.height();
| 
|   Image joined(Geometry(w*2, h), Color("white"));  // Canvas
|   cerr << "Created canvas" << endl;
|   joined.composite(lhsImage, 0, 0);
|   joined.composite(rhsImage, w, 0);
|  
|   cerr << "Writing to blob" << endl;
|   Blob imageBlob;
| 
|   // BLOWS UP HERE DURING THE WRITE TO THE BLOB
|   joined.write(&imageBlob);
|   // ...

I am quite certian that a  AppendImages  type of function is
available, however you will have to have both images form a single
image sequence (or list) rather than as separate images.

Remember IM 'image' data structure is a image sequence, of multiple
images. and that is what append would be expecting.

Sorry to be so vague, but I don't program in C++, but I know the
MagickCore Library and I am expert in the command line usage of IM.

  Anthony Thyssen ( Graphics Enthusiast )    <A.Thyssen at griffith.edu.au>
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  At 600 dpi you can tell it's wet.
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                                                      -- Joshua R. Poulson
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