diff options
| author | Behdad Esfahbod <behdad@behdad.org> | 2008-12-28 02:02:30 -0500 |
|---|---|---|
| committer | Behdad Esfahbod <behdad@behdad.org> | 2008-12-28 02:02:30 -0500 |
| commit | 7f840d156c1212eeb0fddad4b4a6844a9c070bd5 (patch) | |
| tree | 24b47112a64635dfda87a88ed6f0a308353df4f9 /src/cairo-spline.c | |
| parent | 3292f9906b3637564c37863dde5d214b0fee2885 (diff) | |
| download | cairo-7f840d156c1212eeb0fddad4b4a6844a9c070bd5.tar.gz | |
[spline] Save a couple more muls
Diffstat (limited to 'src/cairo-spline.c')
| -rw-r--r-- | src/cairo-spline.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/src/cairo-spline.c b/src/cairo-spline.c index 1b6f4cfb3..5f2dc6ce3 100644 --- a/src/cairo-spline.c +++ b/src/cairo-spline.c @@ -314,7 +314,7 @@ _cairo_spline_bound (cairo_spline_add_point_func_t add_point_func, double x, y; double t_1_0, t_0_1; double t_2_0, t_0_2; - double t_3_0, t_2_1, t_1_2, t_0_3; + double t_3_0, t_2_1_3, t_1_2_3, t_0_3; t_1_0 = t[i]; /* t */ t_0_1 = 1 - t_1_0; /* (1 - t) */ @@ -322,20 +322,20 @@ _cairo_spline_bound (cairo_spline_add_point_func_t add_point_func, t_2_0 = t_1_0 * t_1_0; /* t * t */ t_0_2 = t_0_1 * t_0_1; /* (1 - t) * (1 - t) */ - t_3_0 = t_2_0 * t_1_0; /* t * t * t */ - t_2_1 = t_2_0 * t_0_1; /* t * t * (1 - t) */ - t_1_2 = t_1_0 * t_0_2; /* t * (1 - t) * (1 - t) */ - t_0_3 = t_0_1 * t_0_2; /* (1 - t) * (1 - t) * (1 - t) */ + t_3_0 = t_2_0 * t_1_0; /* t * t * t */ + t_2_1_3 = t_2_0 * t_0_1 * 3; /* t * t * (1 - t) * 3 */ + t_1_2_3 = t_1_0 * t_0_2 * 3; /* t * (1 - t) * (1 - t) * 3 */ + t_0_3 = t_0_1 * t_0_2; /* (1 - t) * (1 - t) * (1 - t) */ /* Bezier polynomial */ - x = x0 * t_0_3 - + 3 * x1 * t_1_2 - + 3 * x2 * t_2_1 - + x3 * t_3_0; - y = y0 * t_0_3 - + 3 * y1 * t_1_2 - + 3 * y2 * t_2_1 - + y3 * t_3_0; + x = x0 * t_0_3 + + x1 * t_1_2_3 + + x2 * t_2_1_3 + + x3 * t_3_0; + y = y0 * t_0_3 + + y1 * t_1_2_3 + + y2 * t_2_1_3 + + y3 * t_3_0; p.x = _cairo_fixed_from_double (x); p.y = _cairo_fixed_from_double (y); |