harfbuzz-ng roll

third_party/harfbuzz-ng/src/hb-shaper-private.hh

+/*
+ * Copyright © 2012  Google, 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.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_SHAPER_PRIVATE_HH
+#define HB_SHAPER_PRIVATE_HH
+
+#include "hb-private.hh"
+
+#include "hb-shape-plan.h" /* TODO remove */
+
+typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t    *shape_plan,
+                                   hb_font_t          *font,
+                                   hb_buffer_t        *buffer,
+                                   const hb_feature_t *features,
+                                   unsigned int        num_features);
+
+#define HB_SHAPER_IMPLEMENT(name) \
+        extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape;
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+
+struct hb_shaper_pair_t {
+  char name[16];
+  hb_shape_func_t *func;
+};
+
+HB_INTERNAL const hb_shaper_pair_t *
+_hb_shapers_get (void);
+
+
+/* For embedding in face / font / ... */
+struct hb_shaper_data_t {
+#define HB_SHAPER_IMPLEMENT(shaper) void *shaper;
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+};
+
+#define HB_SHAPERS_COUNT (sizeof (hb_shaper_data_t) / sizeof (void *))
+
+/* Means: succeeded, but don't need to keep any data. */
+#define HB_SHAPER_DATA_SUCCEEDED ((void *) +1)
+
+/* Means: tried but failed to create. */
+#define HB_SHAPER_DATA_INVALID ((void *) -1)
+#define HB_SHAPER_DATA_IS_INVALID(data) ((void *) (data) == HB_SHAPER_DATA_INVALID)
+
+#define HB_SHAPER_DATA_TYPE(shaper, object)             struct hb_##shaper##_shaper_##object##_data_t
+#define HB_SHAPER_DATA_INSTANCE(shaper, object, instance)       (* (HB_SHAPER_DATA_TYPE(shaper, object) **) &(instance)->shaper_data.shaper)
+#define HB_SHAPER_DATA(shaper, object)                  HB_SHAPER_DATA_INSTANCE (shaper, object, object)
+#define HB_SHAPER_DATA_CREATE_FUNC(shaper, object)      _hb_##shaper##_shaper_##object##_data_create
+#define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object)     _hb_##shaper##_shaper_##object##_data_destroy
+
+#define HB_SHAPER_DATA_PROTOTYPE(shaper, object) \
+        HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \
+        extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \
+        HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS); \
+        extern "C" HB_INTERNAL void \
+        HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *data)
+
+#define HB_SHAPER_DATA_DESTROY(shaper, object) \
+        if (object->shaper_data.shaper && \
+            object->shaper_data.shaper != HB_SHAPER_DATA_INVALID && \
+            object->shaper_data.shaper != HB_SHAPER_DATA_SUCCEEDED) \
+          HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA (shaper, object));
+
+#define HB_SHAPER_DATA_ENSURE_DECLARE(shaper, object) \
+static inline bool \
+hb_##shaper##_shaper_##object##_data_ensure (hb_##object##_t *object) \
+{\
+  retry: \
+  HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
+  if (unlikely (!data)) { \
+    data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \
+    if (unlikely (!data)) \
+      data = (HB_SHAPER_DATA_TYPE (shaper, object) *) HB_SHAPER_DATA_INVALID; \
+    if (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), NULL, data)) { \
+      HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
+      goto retry; \
+    } \
+  } \
+  return data != NULL && !HB_SHAPER_DATA_IS_INVALID (data); \
+}
+
+
+#endif /* HB_SHAPER_PRIVATE_HH */