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[spline] Save a couple more muls

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This commit is contained in:
Behdad Esfahbod 2008-12-28 02:02:30 -05:00
parent 3292f9906b
commit 7f840d156c
1 changed files with 13 additions and 13 deletions
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26
src/cairo-spline.c
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@ -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);