add default matrix

clic/include/tier7.hpp

@@ -16,11 +16,12 @@ namespace cle::tier7
  * @brief Apply an affine transformation matrix to an array and return the result.
  *  The transformation matrix must be 3x3 or 4x4 stored as a 1D array.
  *  The matrix should be row-major, i.e. the first 3 elements are the first row of the matrix.
+ *  If no matrix is given, the identity matrix will be used.
  *
  * @param device Device to perform the operation on. [const Device::Pointer &]
  * @param src Input Array to be transformed. [const Array::Pointer &]
  * @param dst Output Array. [Array::Pointer ( = None )]
- * @param transform_matrix Affine transformation matrix (3x3 or 4x4). [std::vector<float> &]
+ * @param transform_matrix Affine transformation matrix (3x3 or 4x4). [std::vector<float> & ( = [] )]
  * @param interpolate If true, bi/trilinear interpolation will be applied, if hardware allows. [bool ( = False )]
  * @param resize Automatically determines the size of the output depending on the rotation angles. [bool ( = False )]
  * @return Array::Pointer

clic/src/tier7.cpp

@@ -21,6 +21,10 @@ affine_transform_func(const Device::Pointer & device,
                       bool                    interpolate,
                       bool                    resize) -> Array::Pointer
 {
+  if (transform_matrix.empty())
+  {
+    transform_matrix = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 };
+  }
   if (transform_matrix.size() != 16 && transform_matrix.size() != 9)
   {
     throw std::runtime_error("Error: Transformation matrix size must be 9 or 16.");