diff options
Diffstat (limited to 'src/cairo-xlib-surface-shm.c')
| -rw-r--r-- | src/cairo-xlib-surface-shm.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/cairo-xlib-surface-shm.c b/src/cairo-xlib-surface-shm.c index 32c70330..8ac765e6 100644 --- a/src/cairo-xlib-surface-shm.c +++ b/src/cairo-xlib-surface-shm.c @@ -221,6 +221,18 @@ seqno_passed (unsigned long a, unsigned long b) return (long)(b - a) >= 0; } +static inline cairo_bool_t +seqno_before (unsigned long a, unsigned long b) +{ + return (long)(b - a) > 0; +} + +static inline cairo_bool_t +seqno_after (unsigned long a, unsigned long b) +{ + return (long)(a - b) > 0; +} + static inline cairo_status_t _pqueue_init (struct pqueue *pq) { @@ -424,7 +436,7 @@ static void send_event(cairo_xlib_display_t *display, { XShmCompletionEvent ev; - if (seqno_passed (seqno, display->shm->last_event)) + if (seqno_before (seqno, display->shm->last_event)) return; ev.type = display->shm->event; @@ -471,7 +483,7 @@ _cairo_xlib_shm_info_cleanup (cairo_xlib_display_t *display) info = PQ_TOP(pq); do { - if (! seqno_passed (info->last_request, processed)) { + if (seqno_after (info->last_request, processed)) { send_event (display, info, display->shm->last_request); return; } @@ -544,7 +556,7 @@ _cairo_xlib_shm_pool_cleanup (cairo_xlib_display_t *display) cairo_list_foreach_entry_safe (pool, next, cairo_xlib_shm_t, &display->shm->pool, link) { - if (! seqno_passed (pool->attached, processed)) + if (seqno_before (pool->attached, processed)) break; if (pool->mem.free_bytes == pool->mem.max_bytes) @@ -720,7 +732,7 @@ _cairo_xlib_shm_surface_finish (void *abstract_surface) if (active (shm, display->display)) { shm->info->last_request = shm->active; _pqueue_push (&display->shm->info, shm->info); - if (! seqno_passed (display->shm->last_request, shm->active)) + if (seqno_before (display->shm->last_request, shm->active)) display->shm->last_request = shm->active; } else { _cairo_mempool_free (&shm->info->pool->mem, shm->info->mem); |