harfbuzz: check in harfbuzz-ng, add gyp define to use it

third_party/harfbuzz-ng/src/hb-object-private.h

+/*
+ * Copyright (C) 2007  Chris Wilson
+ * Copyright (C) 2009,2010  Red Hat, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Contributor(s):
+ *      Chris Wilson <chris@chris-wilson.co.uk>
+ * Red Hat Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OBJECT_PRIVATE_H
+#define HB_OBJECT_PRIVATE_H
+
+#include "hb-private.h"
+
+HB_BEGIN_DECLS
+
+
+/* Encapsulate operations on the object's reference count */
+typedef struct {
+  hb_atomic_int_t ref_count;
+} hb_reference_count_t;
+
+#define hb_reference_count_inc(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, 1)
+#define hb_reference_count_dec(RC) hb_atomic_int_fetch_and_add ((RC).ref_count, -1)
+
+#define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
+
+#define HB_REFERENCE_COUNT_GET_VALUE(RC) hb_atomic_int_get ((RC).ref_count)
+#define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) hb_atomic_int_set ((RC).ref_count, (VALUE))
+
+#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
+#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
+
+#define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
+
+#define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
+
+
+
+/* Debug */
+
+#ifndef HB_DEBUG_OBJECT
+#define HB_DEBUG_OBJECT (HB_DEBUG+0)
+#endif
+
+static inline void
+_hb_trace_object (const void *obj,
+                  hb_reference_count_t *ref_count,
+                  const char *function)
+{
+  (void) (HB_DEBUG_OBJECT &&
+          fprintf (stderr, "OBJECT(%p) refcount=%d %s\n",
+                   obj,
+                   HB_REFERENCE_COUNT_GET_VALUE (*ref_count),
+                   function));
+}
+
+#define TRACE_OBJECT(obj) _hb_trace_object (obj, &obj->ref_count, __FUNCTION__)
+
+
+
+/* Object allocation and lifecycle manamgement macros */
+
+#define HB_OBJECT_IS_INERT(obj) \
+    (unlikely (HB_REFERENCE_COUNT_IS_INVALID ((obj)->ref_count)))
+
+#define HB_OBJECT_DO_INIT_EXPR(obj) \
+    HB_REFERENCE_COUNT_INIT (obj->ref_count, 1)
+
+#define HB_OBJECT_DO_INIT(obj) \
+  HB_STMT_START { \
+    HB_OBJECT_DO_INIT_EXPR (obj); \
+  } HB_STMT_END
+
+#define HB_OBJECT_DO_CREATE(Type, obj) \
+  likely (( \
+               (void) ( \
+                 ((obj) = (Type *) calloc (1, sizeof (Type))) && \
+                 ( \
+                  HB_OBJECT_DO_INIT_EXPR (obj), \
+                  TRACE_OBJECT (obj), \
+                  TRUE \
+                 ) \
+               ), \
+               (obj) \
+             ))
+
+#define HB_OBJECT_DO_REFERENCE(obj) \
+  HB_STMT_START { \
+    int old_count; \
+    if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
+      return obj; \
+    TRACE_OBJECT (obj); \
+    old_count = hb_reference_count_inc (obj->ref_count); \
+    assert (old_count > 0); \
+    return obj; \
+  } HB_STMT_END
+
+#define HB_OBJECT_DO_GET_REFERENCE_COUNT(obj) \
+  HB_STMT_START { \
+    if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
+      return 0; \
+    return HB_REFERENCE_COUNT_GET_VALUE (obj->ref_count); \
+  } HB_STMT_END
+
+#define HB_OBJECT_DO_DESTROY(obj) \
+  HB_STMT_START { \
+    int old_count; \
+    if (unlikely (!(obj) || HB_OBJECT_IS_INERT (obj))) \
+      return; \
+    TRACE_OBJECT (obj); \
+    old_count = hb_reference_count_dec (obj->ref_count); \
+    assert (old_count > 0); \
+    if (old_count != 1) \
+      return; \
+  } HB_STMT_END
+
+
+HB_END_DECLS
+
+#endif /* HB_OBJECT_PRIVATE_H */