git.maemo.org Git - opencv/blob - interfaces/swig/python/imagedata.i

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  41
  42
  43 // 2004-03-16, Gabriel Schreiber <schreiber@ient.rwth-aachen.de>
  44 //             Mark Asbach       <asbach@ient.rwth-aachen.de>
  45 //             Institute of Communications Engineering, RWTH Aachen University
  46
  47 // 2006-08-29  Roman Stanchak -- converted to use CvMat rather than IplImage
  48
  49
  50 %{
  51
  52 /// Accessor to convert a Python string into the imageData.
  53 void CvMat_imageData_set(CvMat * self, PyObject* object)
  54 {
  55         char* py_string = PyString_AsString(object);
  56         int depth = CV_MAT_DEPTH(self->type);
  57         int cn = CV_MAT_CN(self->type);
  58
  59         if (depth == CV_8U && cn==3){
  60                 // RGB case
  61                 // The data is reordered beause OpenCV uses BGR instead of RGB
  62
  63                 for (long line = 0; line < self->rows; ++line)
  64                         for (long pixel = 0; pixel < self->cols; ++pixel)
  65                         {
  66                                 // In OpenCV the beginning of the lines are aligned
  67                                 // to 4 Bytes. So use step instead of cols.
  68                                 long position = line*self->step + pixel*3;
  69                                 long sourcepos = line*self->cols*3 + pixel*3;
  70                                 self->data.ptr[position  ] = py_string[sourcepos+2];
  71                                 self->data.ptr[position+1] = py_string[sourcepos+1];
  72                                 self->data.ptr[position+2] = py_string[sourcepos  ];
  73                         }
  74         }
  75         else if (depth == CV_8U && cn==1)
  76         {
  77                 // Grayscale 8bit case
  78
  79                 for (long line = 0; line < self->rows; ++line)
  80                 {
  81                         // In OpenCV the beginning of the lines are aligned
  82                         // to 4 Bytes. So use step instead of cols.
  83                         memcpy
  84                                 (
  85                                  self->data.ptr + line*self->step,
  86                                  py_string + line*self->cols,
  87                                  self->step
  88                                 );
  89                 }
  90         }
  91         else if ( depth == CV_32F )
  92         {
  93                 // float (32bit) case
  94                 for (long line = 0; line < self->rows; ++line)
  95                 {
  96                         // here we don not have to care about alignment as the Floats are
  97                         // as long as the alignment
  98                         memcpy
  99                                 (
 100                                  self->data.ptr + line*self->step,
 101                                  py_string + line*self->cols*sizeof(float),
 102                                  self->step
 103                                 );
 104                 }
 105         }
 106         else if ( depth == CV_64F )
 107         {
 108                 // double (64bit) case
 109                 for (long line = 0; line < self->rows; ++line)
 110                 {
 111                         // here we don not have to care about alignment as the Floats are
 112                         // as long as the alignment
 113                         memcpy
 114                                 (
 115                                  self->data.ptr + line*self->step,
 116                                  py_string + line*self->cols*sizeof(double),
 117                                  self->step
 118                                 );
 119                 }
 120         }
 121         else
 122         {
 123           // make some noise
 124           SendErrorToPython (SWIG_TypeError,
 125                        "CvMat_imageData_set",
 126                        "cannot convert string data to this image format",
 127                        __FILE__, __LINE__, NULL);
 128         }
 129 }
 130
 131 /// Accessor to convert the imageData into a Python string.
 132 PyObject* CvMat_imageData_get(CvMat * self)
 133 {
 134         if (!self->data.ptr)
 135         {
 136                 PyErr_SetString(PyExc_TypeError, "Data pointer of CvMat is NULL");
 137                 return NULL;
 138         }
 139         return PyString_FromStringAndSize((const char *)self->data.ptr, self->rows*self->step);
 140 }
 141
 142 %}
 143
 144 // add virtual member variable to CvMat
 145 %extend CvMat {
 146         PyObject * imageData;
 147 };