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[cairo-polygon] Add a cache of eight edges to cairo_polygon_t

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Many, if not most, of polygons have very few edges.  This avoids
calling malloc() for those cases.
This commit is contained in:
Behdad Esfahbod 2007-03-13 06:07:03 -04:00
parent d8165d5424
commit b706bd9b38
2 changed files with 24 additions and 7 deletions
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30
src/cairo-polygon.c
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@ -56,26 +56,42 @@ _cairo_polygon_init (cairo_polygon_t *polygon)
void
_cairo_polygon_fini (cairo_polygon_t *polygon)
{
if (polygon->edges_size) {
if (polygon->edges != polygon->edges_embedded)
free (polygon->edges);
polygon->edges = NULL;
polygon->edges_size = 0;
polygon->num_edges = 0;
}
polygon->edges = NULL;
polygon->edges_size = 0;
polygon->num_edges = 0;
polygon->has_current_point = FALSE;
}
/* make room for at least one more edge */
static cairo_status_t
_cairo_polygon_grow (cairo_polygon_t *polygon)
{
cairo_edge_t *new_edges;
int old_size = polygon->edges_size;
int new_size = old_size ? 2 * old_size : 16;
int embedded_size = sizeof (polygon->edges_embedded) / sizeof (polygon->edges_embedded[0]);
int new_size = 2 * MAX (old_size, 16);
/* we have a local buffer at polygon->edges_embedded. try to fulfill the request
* from there. */
if (old_size < embedded_size) {
polygon->edges = polygon->edges_embedded;
polygon->edges_size = embedded_size;
return CAIRO_STATUS_SUCCESS;
}
assert (polygon->num_edges <= polygon->edges_size);
new_edges = realloc (polygon->edges, new_size * sizeof (cairo_edge_t));
if (polygon->edges == polygon->edges_embedded) {
new_edges = malloc (new_size * sizeof (cairo_edge_t));
if (new_edges)
memcpy (new_edges, polygon->edges, old_size * sizeof (cairo_edge_t));
} else {
new_edges = realloc (polygon->edges, new_size * sizeof (cairo_edge_t));
}
if (new_edges == NULL) {
return CAIRO_STATUS_NO_MEMORY;

1
src/cairoint.h
View file

@ -428,6 +428,7 @@ typedef struct _cairo_polygon {
int num_edges;
int edges_size;
cairo_edge_t *edges;
cairo_edge_t edges_embedded[8];
} cairo_polygon_t;
typedef struct _cairo_spline {