diff options
Diffstat (limited to 'src/cairo-matrix.c')
| -rw-r--r-- | src/cairo-matrix.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/cairo-matrix.c b/src/cairo-matrix.c index de89c0fd5..cc5635fff 100644 --- a/src/cairo-matrix.c +++ b/src/cairo-matrix.c @@ -405,3 +405,27 @@ _cairo_matrix_compute_scale_factors (cairo_matrix_t *matrix, double *sx, double return CAIRO_STATUS_SUCCESS; } + +int +_cairo_matrix_is_integer_translation(cairo_matrix_t *mat, + int *itx, int *ity) +{ + double a, b, c, d, tx, ty; + int ttx, tty; + int ok = 0; + cairo_matrix_get_affine (mat, &a, &b, &c, &d, &tx, &ty); + ttx = _cairo_fixed_from_double (tx); + tty = _cairo_fixed_from_double (ty); + ok = ((a == 1.0) + && (b == 0.0) + && (c == 0.0) + && (d == 1.0) + && (_cairo_fixed_is_integer(ttx)) + && (_cairo_fixed_is_integer(tty))); + if (ok) { + *itx = _cairo_fixed_integer_part(ttx); + *ity = _cairo_fixed_integer_part(tty); + return 1; + } + return 0; +} |