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rounded rect: cache arcs

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We are only ever drawing axis-aligned quarter arcs here. By caching
these paths, sincos drops from the profiles for drawing-heavy
workloads.
This commit is contained in:
Matthias Clasen 2015-09-29 09:40:00 -04:00
parent a768798f2b
commit d9f05aa3f9
1 changed files with 76 additions and 2 deletions
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78
gtk/gtkroundedbox.c
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@ -215,6 +215,80 @@ _gtk_rounded_box_move (GtkRoundedBox *box,
box->box.y += dy;
}
typedef struct {
double angle1;
double angle2;
gboolean negative;
} Arc;
static guint
arc_path_hash (Arc *arc)
{
return g_double_hash (&arc->angle1) ^ g_double_hash (&arc->angle2) ^ arc->negative;
}
static gboolean
arc_path_equal (Arc *arc1,
Arc *arc2)
{
return arc1->angle1 == arc2->angle1 &&
arc1->angle2 == arc2->angle2 &&
arc1->negative == arc2->negative;
}
/* We need the path to start with a line-to */
static cairo_path_t *
fixup_path (cairo_path_t *path)
{
cairo_path_data_t *data;
data = &path->data[0];
if (data->header.type == CAIRO_PATH_MOVE_TO)
data->header.type = CAIRO_PATH_LINE_TO;
return path;
}
static void
append_arc (cairo_t *cr, double angle1, double angle2, gboolean negative)
{
static GHashTable *arc_path_cache;
Arc key;
cairo_path_t *arc;
key.angle1 = angle1;
key.angle2 = angle2;
key.negative = negative;
if (arc_path_cache == NULL)
arc_path_cache = g_hash_table_new_full ((GHashFunc)arc_path_hash,
(GEqualFunc)arc_path_equal,
g_free, (GDestroyNotify)cairo_path_destroy);
arc = g_hash_table_lookup (arc_path_cache, &key);
if (arc == NULL)
{
cairo_surface_t *surface;
cairo_t *tmp;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
tmp = cairo_create (surface);
if (negative)
cairo_arc_negative (tmp, 0.0, 0.0, 1.0, angle1, angle2);
else
cairo_arc (tmp, 0.0, 0.0, 1.0, angle1, angle2);
arc = fixup_path (cairo_copy_path (tmp));
g_hash_table_insert (arc_path_cache, g_memdup (&key, sizeof (key)), arc);
cairo_destroy (tmp);
cairo_surface_destroy (surface);
}
cairo_append_path (cr, arc);
}
static void
_cairo_ellipsis (cairo_t *cr,
double xc, double yc,
@ -232,7 +306,7 @@ _cairo_ellipsis (cairo_t *cr,
cairo_get_matrix (cr, &save);
cairo_translate (cr, xc, yc);
cairo_scale (cr, xradius, yradius);
cairo_arc (cr, 0, 0, 1.0, angle1, angle2);
append_arc (cr, angle1, angle2, FALSE);
cairo_set_matrix (cr, &save);
}
@ -253,7 +327,7 @@ _cairo_ellipsis_negative (cairo_t *cr,
cairo_get_matrix (cr, &save);
cairo_translate (cr, xc, yc);
cairo_scale (cr, xradius, yradius);
cairo_arc_negative (cr, 0, 0, 1.0, angle1, angle2);
append_arc (cr, angle1, angle2, TRUE);
cairo_set_matrix (cr, &save);
}