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[surface] Assign a unique id to the surface.

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Allocate an ever-increasing, non-zero, unique identifier to each surface.
True for the first 4-billion...
This commit is contained in:
Chris Wilson 2009-05-27 16:45:20 +01:00
parent 45835f623f
commit e05097c604
3 changed files with 35 additions and 3 deletions
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11
src/cairo-pattern.c
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@ -2424,7 +2424,10 @@ static unsigned long
_cairo_surface_pattern_hash (unsigned long hash,
const cairo_pattern_t *pattern)
{
/* XXX requires cow-snapshots */
const cairo_surface_pattern_t *surface = (cairo_surface_pattern_t *) pattern;
hash ^= surface->surface->unique_id;
return hash;
}
@ -2578,8 +2581,10 @@ static cairo_bool_t
_cairo_surface_pattern_equal (const cairo_pattern_t *A,
const cairo_pattern_t *B)
{
/* XXX requires cow-snapshots */
return FALSE;
const cairo_surface_pattern_t *a = (cairo_surface_pattern_t *) A;
const cairo_surface_pattern_t *b = (cairo_surface_pattern_t *) B;
return a->surface->unique_id == b->surface->unique_id;
}
cairo_bool_t

2
src/cairo-surface-private.h
View file

@ -56,6 +56,8 @@ struct _cairo_surface {
cairo_reference_count_t ref_count;
cairo_status_t status;
cairo_bool_t finished;
unsigned int unique_id;
cairo_user_data_array_t user_data;
cairo_user_data_array_t mime_data;

25
src/cairo-surface.c
View file

@ -50,6 +50,7 @@ const cairo_surface_t name = { \
CAIRO_REFERENCE_COUNT_INVALID, /* ref_count */ \
status, /* status */ \
FALSE, /* finished */ \
0, /* unique id */ \
{ 0, 0, 0, NULL, }, /* user_data */ \
{ 0, 0, 0, NULL, }, /* mime_data */ \
{ 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 }, /* device_transform */ \
@ -180,6 +181,29 @@ cairo_surface_status (cairo_surface_t *surface)
}
slim_hidden_def (cairo_surface_status);
static unsigned long
_cairo_surface_allocate_unique_id (void)
{
static unsigned int unique_id;
#if CAIRO_NO_MUTEX
if (++unique_id == 0)
unique_id = 1;
return unique_id;
#else
unsigned int old, id;
do {
old = _cairo_atomic_int_get (&unique_id);
id = old + 1;
if (id == 0)
id = 1;
} while (! _cairo_atomic_int_cmpxchg (&unique_id, old, id));
return id;
#endif
}
void
_cairo_surface_init (cairo_surface_t *surface,
const cairo_surface_backend_t *backend,
@ -194,6 +218,7 @@ _cairo_surface_init (cairo_surface_t *surface,
CAIRO_REFERENCE_COUNT_INIT (&surface->ref_count, 1);
surface->status = CAIRO_STATUS_SUCCESS;
surface->finished = FALSE;
surface->unique_id = _cairo_surface_allocate_unique_id ();
_cairo_user_data_array_init (&surface->user_data);
_cairo_user_data_array_init (&surface->mime_data);