Dear All,
For my small visualization project I need the functions
cairo-get-matrix and cairo-set-matrix. The cairo_matrix_t type is
defined in cairo.sdl as shown below:
(define-foreign-type cairo_matrix_t (c-pointer "cairo_matrix_t")
values
(cut tag-pointer <> 'cairo-matrix))
cairo-get-matrix expects a cairo_matrix_t pointer as shown below, but
I couldn't figure out how to create such a type. Is it correct that
define-foreign-type registers the type with CHICKEN's type system, but
does not create a constructor?
(define cairo-get-matrix
(foreign-lambda void "cairo_get_matrix" cairo_t cairo_matrix_t))
For now I worked around it by using the code below. Is this correct
chickenwise? Is there a better solution?
(define cairo-get-matrix
(foreign-lambda* cairo_matrix_t ((cairo_t ct))
"cairo_matrix_t cmt;
cairo_get_matrix(ct, &cmt);
C_return(&cmt);"))
Thanks in advance!
Markus
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