diff options
Diffstat (limited to 'src/cairo-matrix.c')
| -rw-r--r-- | src/cairo-matrix.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/src/cairo-matrix.c b/src/cairo-matrix.c index 6c83388e..94ed0e91 100644 --- a/src/cairo-matrix.c +++ b/src/cairo-matrix.c @@ -688,16 +688,9 @@ _cairo_matrix_is_integer_translation (const cairo_matrix_t *matrix, return FALSE; } -/* By pixel exact here, we mean a matrix that is composed only of - * 90 degree rotations, flips, and integer translations and produces a 1:1 - * mapping between source and destination pixels. If we transform an image - * with a pixel-exact matrix, filtering is not useful. - */ -cairo_private cairo_bool_t -_cairo_matrix_is_pixel_exact (const cairo_matrix_t *matrix) +cairo_bool_t +_cairo_matrix_has_unity_scale (const cairo_matrix_t *matrix) { - cairo_fixed_t x0_fixed, y0_fixed; - if (matrix->xy == 0.0 && matrix->yx == 0.0) { if (! (matrix->xx == 1.0 || matrix->xx == -1.0)) return FALSE; @@ -711,6 +704,22 @@ _cairo_matrix_is_pixel_exact (const cairo_matrix_t *matrix) } else return FALSE; + return TRUE; +} + +/* By pixel exact here, we mean a matrix that is composed only of + * 90 degree rotations, flips, and integer translations and produces a 1:1 + * mapping between source and destination pixels. If we transform an image + * with a pixel-exact matrix, filtering is not useful. + */ +cairo_bool_t +_cairo_matrix_is_pixel_exact (const cairo_matrix_t *matrix) +{ + cairo_fixed_t x0_fixed, y0_fixed; + + if (! _cairo_matrix_has_unity_scale (matrix)) + return FALSE; + x0_fixed = _cairo_fixed_from_double (matrix->x0); y0_fixed = _cairo_fixed_from_double (matrix->y0); |