127 lines
5.2 KiB
C++
127 lines
5.2 KiB
C++
/*
|
|
* 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"
|
|
|
|
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##_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) (* (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)) \
|
|
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_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \
|
|
if (likely (data) && !(condition)) { \
|
|
/* 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. */ \
|
|
/* Drop and recreate. */ \
|
|
/* If someone dropped it in the mean time, throw it away and don't touch it. \
|
|
* Otherwise, destruct it. */ \
|
|
if (hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), 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 (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), 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) 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_PRIVATE_HH */
|