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authorAkira Kakuto <kakuto@fuk.kindai.ac.jp>2018-09-11 04:13:36 +0000
committerAkira Kakuto <kakuto@fuk.kindai.ac.jp>2018-09-11 04:13:36 +0000
commit683672628fe7bb6a6c5e71735942eb1b5fcae0a6 (patch)
treeb01fc67059d533445d1bc8826f03c5055af389c2 /Build/source/libs/harfbuzz/harfbuzz-src/src/hb-shaper.hh
parentc9d2cebb0c8eac1a2f3f6aac9031c9957cf956aa (diff)
harfbuzz 1.9.0
git-svn-id: svn://tug.org/texlive/trunk@48641 c570f23f-e606-0410-a88d-b1316a301751
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+/*
+ * 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_HH
+#define HB_SHAPER_HH
+
+#include "hb.hh"
+
+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);
+
+
+/* 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_TYPE_NAME(shaper, object) hb_##shaper##_##object##_data_t
+#define HB_SHAPER_DATA_TYPE(shaper, object) struct HB_SHAPER_DATA_TYPE_NAME(shaper, object)
+#define HB_SHAPER_DATA_INSTANCE(shaper, object, instance) (* reinterpret_cast<hb_atomic_ptr_t<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_ENSURE_FUNC(shaper, object) hb_##shaper##_shaper_##object##_data_ensure
+
+#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); \
+ extern "C" HB_INTERNAL bool \
+ HB_SHAPER_DATA_ENSURE_FUNC (shaper, object) (hb_##object##_t *object)
+
+#define HB_SHAPER_DATA_DESTROY(shaper, object) \
+ if (HB_SHAPER_DATA_TYPE (shaper, object) *data = HB_SHAPER_DATA (shaper, object).get ()) \
+ if (data != HB_SHAPER_DATA_INVALID && data != HB_SHAPER_DATA_SUCCEEDED) \
+ HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data);
+
+#define HB_SHAPER_DATA_ENSURE_DEFINE(shaper, object) \
+ HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, true)
+
+#define HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, condition) \
+bool \
+HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) (hb_##object##_t *object) \
+{\
+ retry: \
+ HB_SHAPER_DATA_TYPE (shaper, object) *data = HB_SHAPER_DATA (shaper, object).get (); \
+ if (likely (data) && !(condition)) { \
+ /* XXX-MT-bug \
+ * Note that evaluating condition above can be dangerous if another thread \
+ * got here first and destructed data. That's, as always, bad use pattern. \
+ * If you modify the font (change font size), other threads must not be \
+ * using it at the same time. However, since this check is delayed to \
+ * when one actually tries to shape something, this is a XXX race condition \
+ * (and the only know we have that I know of) right now. Ie. you modify the \
+ * font size in one thread, then (supposedly safely) try to use it from two \
+ * or more threads and BOOM! I'm not sure how to fix this. We want RCU. \
+ * Maybe when it doesn't matter when we finally implement AAT shaping, as
+ * this (condition) is currently only used by hb-coretext. */ \
+ /* Drop and recreate. */ \
+ /* If someone dropped it in the mean time, throw it away and don't touch it. \
+ * Otherwise, destruct it. */ \
+ if (likely (HB_SHAPER_DATA (shaper, object).cmpexch (data, nullptr))) \
+ { \
+ HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
+ } \
+ goto retry; \
+ } \
+ 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 (unlikely (!HB_SHAPER_DATA (shaper, object).cmpexch (nullptr, data))) { \
+ if (data && \
+ data != HB_SHAPER_DATA_INVALID && \
+ data != HB_SHAPER_DATA_SUCCEEDED) \
+ HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \
+ goto retry; \
+ } \
+ } \
+ return data != nullptr && (void *) data != HB_SHAPER_DATA_INVALID; \
+}
+
+
+/* For embedding in face / font / ... */
+struct hb_shaper_data_t {
+#define HB_SHAPER_IMPLEMENT(shaper) hb_atomic_ptr_t<void *> shaper;
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+};
+#define HB_SHAPERS_COUNT (sizeof (hb_shaper_data_t) / sizeof (void *))
+
+
+#endif /* HB_SHAPER_HH */