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[cairo-spline] Add a cache of eight points to cairo_spline_t

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Most of the splines need not more than eight points.  This avoids
calling malloc() for those cases, and eight-points take only 64 bytes.
This commit is contained in:
Behdad Esfahbod 2007-03-08 22:34:44 -05:00
parent 1e64ecf075
commit 9eee167210
2 changed files with 24 additions and 5 deletions
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28
src/cairo-spline.c
View file

@ -90,22 +90,40 @@ _cairo_spline_init (cairo_spline_t *spline,
void
_cairo_spline_fini (cairo_spline_t *spline)
{
spline->num_points = 0;
spline->points_size = 0;
free (spline->points);
if (spline->points != spline->points_embedded)
free (spline->points);
spline->points = NULL;
spline->points_size = 0;
spline->num_points = 0;
}
/* make room for at least one more trap */
static cairo_status_t
_cairo_spline_grow (cairo_spline_t *spline)
{
cairo_point_t *new_points;
int old_size = spline->points_size;
int new_size = old_size ? 2 * old_size : 32;
int embedded_size = sizeof (spline->points_embedded) / sizeof (spline->points_embedded[0]);
int new_size = 2 * MAX (old_size, 16);
/* we have a local buffer at spline->points_embedded. try to fulfill the request
* from there. */
if (old_size < embedded_size) {
spline->points = spline->points_embedded;
spline->points_size = embedded_size;
return CAIRO_STATUS_SUCCESS;
}
assert (spline->num_points <= spline->points_size);
new_points = realloc (spline->points, new_size * sizeof (cairo_point_t));
if (spline->points == spline->points_embedded) {
new_points = malloc (new_size * sizeof (cairo_point_t));
if (new_points)
memcpy (new_points, spline->points, old_size * sizeof (cairo_point_t));
} else {
new_points = realloc (spline->points, new_size * sizeof (cairo_point_t));
}
if (new_points == NULL) {
return CAIRO_STATUS_NO_MEMORY;

1
src/cairoint.h
View file

@ -441,6 +441,7 @@ typedef struct _cairo_spline {
int num_points;
int points_size;
cairo_point_t *points;
cairo_point_t points_embedded[8];
} cairo_spline_t;
typedef struct _cairo_pen_vertex {