Update the trunk to the OpenCV's CVS (2008-07-14)
[opencv] / interfaces / swig / python / imagedata.i
1 /*M///////////////////////////////////////////////////////////////////////////////////////
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11 //                For Open Source Computer Vision Library
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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         int step = self->step ? self->step : 
60           step = CV_ELEM_SIZE(self->type) * self->cols;
61
62         if (depth == CV_8U && cn==3){
63                 // RGB case
64                 // The data is reordered beause OpenCV uses BGR instead of RGB
65
66                 for (long line = 0; line < self->rows; ++line)
67                         for (long pixel = 0; pixel < self->cols; ++pixel)
68                         {
69                                 // In OpenCV the beginning of the lines are aligned
70                                 // to 4 Bytes. So use step instead of cols.
71                                 long position = line*step + pixel*3;
72                                 long sourcepos = line*self->cols*3 + pixel*3;
73                                 self->data.ptr[position  ] = py_string[sourcepos+2];
74                                 self->data.ptr[position+1] = py_string[sourcepos+1];
75                                 self->data.ptr[position+2] = py_string[sourcepos  ];
76                         }
77         }
78         else if (depth == CV_8U && cn==1)
79         {
80                 // Grayscale 8bit case
81
82                 for (long line = 0; line < self->rows; ++line)
83                 {
84                         // In OpenCV the beginning of the lines are aligned
85                         // to 4 Bytes. So use step instead of cols.
86                         memcpy
87                                 (
88                                  self->data.ptr + line*step,
89                                  py_string + line*self->cols,
90                                  step
91                                 );
92                 }
93         }
94         else if ( depth == CV_32F )
95         {
96                 // float (32bit) case
97                 for (long line = 0; line < self->rows; ++line)
98                 {
99                         // here we don not have to care about alignment as the Floats are
100                         // as long as the alignment
101                         memcpy
102                                 (
103                                  self->data.ptr + line*step,
104                                  py_string + line*self->cols*sizeof(float),
105                                  step
106                                 );
107                 }
108         }
109         else if ( depth == CV_64F )
110         {
111                 // double (64bit) case
112                 for (long line = 0; line < self->rows; ++line)
113                 {
114                         // here we don not have to care about alignment as the Floats are
115                         // as long as the alignment
116                         memcpy
117                                 (
118                                  self->data.ptr + line*step,
119                                  py_string + line*self->cols*sizeof(double),
120                                  step
121                                 );
122                 }
123         }
124         else
125         {
126           // make some noise
127           SendErrorToPython (SWIG_TypeError, 
128                        "CvMat_imageData_set", 
129                        "cannot convert string data to this image format",
130                        __FILE__, __LINE__, NULL);
131         }
132 }
133
134 /// Accessor to convert the imageData into a Python string.
135 PyObject* CvMat_imageData_get(CvMat * self) 
136 {
137         if (!self->data.ptr)
138         {
139                 PyErr_SetString(PyExc_TypeError, "Data pointer of CvMat is NULL");
140                 return NULL;
141         }                
142         int step = self->step ? self->step : 
143           step = CV_ELEM_SIZE(self->type) * self->cols;
144         return PyString_FromStringAndSize((const char *)self->data.ptr, self->rows*step);
145 }
146
147 %}
148
149 // add virtual member variable to CvMat
150 %extend CvMat {
151         PyObject * imageData;
152 };