[USE] Start putting together the shaper body
This commit is contained in:
Behdad Esfahbod
parent
e0eabd7f67
commit
a9663958fe
|
|
@ -131,7 +131,7 @@ enum indic_syllabic_category_t
|
||||||
};
|
};
|
||||||
|
|
||||||
/* Categories used in IndicPositionalCategory.txt from UCD */
|
/* Categories used in IndicPositionalCategory.txt from UCD */
|
||||||
enum indic_matra_category_t {
|
enum indic_positional_category_t {
|
||||||
INDIC_POSITIONAL_CATEGORY_BOTTOM,
|
INDIC_POSITIONAL_CATEGORY_BOTTOM,
|
||||||
INDIC_POSITIONAL_CATEGORY_BOTTOM_AND_RIGHT,
|
INDIC_POSITIONAL_CATEGORY_BOTTOM_AND_RIGHT,
|
||||||
INDIC_POSITIONAL_CATEGORY_LEFT,
|
INDIC_POSITIONAL_CATEGORY_LEFT,
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,339 @@
|
||||||
|
/*
|
||||||
|
* Copyright © 2015 Mozilla Foundation.
|
||||||
|
* Copyright © 2015 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.
|
||||||
|
*
|
||||||
|
* Mozilla Author(s): Jonathan Kew
|
||||||
|
* Google Author(s): Behdad Esfahbod
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "hb-ot-shape-complex-use-private.hh"
|
||||||
|
|
||||||
|
/* buffer var allocations */
|
||||||
|
#define use_category() complex_var_u8_0()
|
||||||
|
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Universal Shaping Engine.
|
||||||
|
* https://www.microsoft.com/typography/OpenTypeDev/USE/intro.htm
|
||||||
|
*/
|
||||||
|
|
||||||
|
static const hb_tag_t
|
||||||
|
basic_features[] =
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* Basic features.
|
||||||
|
* These features are applied in order, one at a time, after initial_reordering.
|
||||||
|
*/
|
||||||
|
HB_TAG('p','r','e','f'),
|
||||||
|
HB_TAG('a','b','v','f'),
|
||||||
|
HB_TAG('b','l','w','f'),
|
||||||
|
HB_TAG('p','s','t','f'),
|
||||||
|
};
|
||||||
|
static const hb_tag_t
|
||||||
|
other_features[] =
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* Other features.
|
||||||
|
* These features are applied all at once, after final_reordering.
|
||||||
|
*/
|
||||||
|
HB_TAG('p','r','e','s'),
|
||||||
|
HB_TAG('a','b','v','s'),
|
||||||
|
HB_TAG('b','l','w','s'),
|
||||||
|
HB_TAG('p','s','t','s'),
|
||||||
|
/* Positioning features, though we don't care about the types. */
|
||||||
|
HB_TAG('d','i','s','t'),
|
||||||
|
};
|
||||||
|
|
||||||
|
static void
|
||||||
|
setup_syllables (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_font_t *font,
|
||||||
|
hb_buffer_t *buffer);
|
||||||
|
static void
|
||||||
|
reordering (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_font_t *font,
|
||||||
|
hb_buffer_t *buffer);
|
||||||
|
|
||||||
|
static void
|
||||||
|
collect_features_use (hb_ot_shape_planner_t *plan)
|
||||||
|
{
|
||||||
|
hb_ot_map_builder_t *map = &plan->map;
|
||||||
|
|
||||||
|
/* Do this before any lookups have been applied. */
|
||||||
|
map->add_gsub_pause (setup_syllables);
|
||||||
|
|
||||||
|
map->add_global_bool_feature (HB_TAG('l','o','c','l'));
|
||||||
|
/* The Indic specs do not require ccmp, but we apply it here since if
|
||||||
|
* there is a use of it, it's typically at the beginning. */
|
||||||
|
map->add_global_bool_feature (HB_TAG('c','c','m','p'));
|
||||||
|
|
||||||
|
for (unsigned int i = 0; i < ARRAY_LENGTH (basic_features); i++)
|
||||||
|
{
|
||||||
|
map->add_feature (basic_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
|
||||||
|
map->add_gsub_pause (NULL);
|
||||||
|
}
|
||||||
|
map->add_gsub_pause (reordering);
|
||||||
|
for (unsigned int i = 0; i < ARRAY_LENGTH (other_features); i++)
|
||||||
|
map->add_feature (other_features[i], 1, F_GLOBAL | F_MANUAL_ZWJ);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
override_features_use (hb_ot_shape_planner_t *plan)
|
||||||
|
{
|
||||||
|
plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
enum syllable_type_t {
|
||||||
|
independent_cluster,
|
||||||
|
virama_terminated_cluster,
|
||||||
|
consonant_cluster,
|
||||||
|
vowel_cluster,
|
||||||
|
number_joiner_terminated_cluster,
|
||||||
|
numeral_cluster,
|
||||||
|
symbol_cluster,
|
||||||
|
};
|
||||||
|
|
||||||
|
#include "hb-ot-shape-complex-use-machine.hh"
|
||||||
|
|
||||||
|
|
||||||
|
static inline void
|
||||||
|
set_use_properties (hb_glyph_info_t &info)
|
||||||
|
{
|
||||||
|
hb_codepoint_t u = info.codepoint;
|
||||||
|
unsigned int type = hb_use_get_categories (u);
|
||||||
|
indic_syllabic_category_t cat = (indic_syllabic_category_t) (type & 0x7Fu);
|
||||||
|
indic_positional_category_t pos = (indic_positional_category_t) (type >> 8);
|
||||||
|
use_category_t use = USE_O;
|
||||||
|
|
||||||
|
switch (cat)
|
||||||
|
{
|
||||||
|
/* TODO */
|
||||||
|
}
|
||||||
|
|
||||||
|
info.use_category() = use;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static void
|
||||||
|
setup_masks_use (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
||||||
|
hb_buffer_t *buffer,
|
||||||
|
hb_font_t *font HB_UNUSED)
|
||||||
|
{
|
||||||
|
HB_BUFFER_ALLOCATE_VAR (buffer, use_category);
|
||||||
|
|
||||||
|
/* We cannot setup masks here. We save information about characters
|
||||||
|
* and setup masks later on in a pause-callback. */
|
||||||
|
|
||||||
|
unsigned int count = buffer->len;
|
||||||
|
hb_glyph_info_t *info = buffer->info;
|
||||||
|
for (unsigned int i = 0; i < count; i++)
|
||||||
|
set_use_properties (info[i]);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
||||||
|
hb_font_t *font HB_UNUSED,
|
||||||
|
hb_buffer_t *buffer)
|
||||||
|
{
|
||||||
|
find_syllables (buffer);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static void
|
||||||
|
reorder_virama_terminated_cluster (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_face_t *face,
|
||||||
|
hb_buffer_t *buffer,
|
||||||
|
unsigned int start, unsigned int end)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
reorder_consonant_cluster (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_face_t *face,
|
||||||
|
hb_buffer_t *buffer,
|
||||||
|
unsigned int start, unsigned int end)
|
||||||
|
{
|
||||||
|
hb_glyph_info_t *info = buffer->info;
|
||||||
|
|
||||||
|
/* Reorder! */
|
||||||
|
#if 0
|
||||||
|
unsigned int i = start;
|
||||||
|
for (; i < base; i++)
|
||||||
|
info[i].use_position() = POS_PRE_C;
|
||||||
|
if (i < end)
|
||||||
|
{
|
||||||
|
info[i].use_position() = POS_BASE_C;
|
||||||
|
i++;
|
||||||
|
}
|
||||||
|
for (; i < end; i++)
|
||||||
|
{
|
||||||
|
if (info[i].use_category() == OT_MR) /* Pre-base reordering */
|
||||||
|
{
|
||||||
|
info[i].use_position() = POS_PRE_C;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
if (info[i].use_category() == OT_VPre) /* Left matra */
|
||||||
|
{
|
||||||
|
info[i].use_position() = POS_PRE_M;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
info[i].use_position() = POS_AFTER_MAIN;
|
||||||
|
}
|
||||||
|
|
||||||
|
buffer->merge_clusters (start, end);
|
||||||
|
/* Sit tight, rock 'n roll! */
|
||||||
|
hb_bubble_sort (info + start, end - start, compare_use_order);
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
reorder_vowel_cluster (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_face_t *face,
|
||||||
|
hb_buffer_t *buffer,
|
||||||
|
unsigned int start, unsigned int end)
|
||||||
|
{
|
||||||
|
reorder_consonant_cluster (plan, face, buffer, start, end);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
reorder_syllable (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_face_t *face,
|
||||||
|
hb_buffer_t *buffer,
|
||||||
|
unsigned int start, unsigned int end)
|
||||||
|
{
|
||||||
|
syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F);
|
||||||
|
switch (syllable_type) {
|
||||||
|
#define HANDLE(X) case X: reorder_##X (plan, face, buffer, start, end); return
|
||||||
|
HANDLE (virama_terminated_cluster);
|
||||||
|
HANDLE (consonant_cluster);
|
||||||
|
HANDLE (vowel_cluster);
|
||||||
|
#undef HANDLE
|
||||||
|
#define HANDLE(X) case X: return
|
||||||
|
HANDLE (number_joiner_terminated_cluster);
|
||||||
|
HANDLE (numeral_cluster);
|
||||||
|
HANDLE (symbol_cluster);
|
||||||
|
HANDLE (independent_cluster);
|
||||||
|
#undef HANDLE
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline void
|
||||||
|
insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
||||||
|
hb_font_t *font,
|
||||||
|
hb_buffer_t *buffer)
|
||||||
|
{
|
||||||
|
#if 0
|
||||||
|
/* Note: This loop is extra overhead, but should not be measurable. */
|
||||||
|
bool has_broken_syllables = false;
|
||||||
|
unsigned int count = buffer->len;
|
||||||
|
hb_glyph_info_t *info = buffer->info;
|
||||||
|
for (unsigned int i = 0; i < count; i++)
|
||||||
|
if ((info[i].syllable() & 0x0F) == broken_cluster)
|
||||||
|
{
|
||||||
|
has_broken_syllables = true;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (likely (!has_broken_syllables))
|
||||||
|
return;
|
||||||
|
|
||||||
|
|
||||||
|
hb_codepoint_t dottedcircle_glyph;
|
||||||
|
if (!font->get_glyph (0x25CCu, 0, &dottedcircle_glyph))
|
||||||
|
return;
|
||||||
|
|
||||||
|
hb_glyph_info_t dottedcircle = {0};
|
||||||
|
dottedcircle.codepoint = 0x25CCu;
|
||||||
|
set_use_properties (dottedcircle);
|
||||||
|
dottedcircle.codepoint = dottedcircle_glyph;
|
||||||
|
|
||||||
|
buffer->clear_output ();
|
||||||
|
|
||||||
|
buffer->idx = 0;
|
||||||
|
unsigned int last_syllable = 0;
|
||||||
|
while (buffer->idx < buffer->len)
|
||||||
|
{
|
||||||
|
unsigned int syllable = buffer->cur().syllable();
|
||||||
|
syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F);
|
||||||
|
if (unlikely (last_syllable != syllable && syllable_type == broken_cluster))
|
||||||
|
{
|
||||||
|
last_syllable = syllable;
|
||||||
|
|
||||||
|
hb_glyph_info_t info = dottedcircle;
|
||||||
|
info.cluster = buffer->cur().cluster;
|
||||||
|
info.mask = buffer->cur().mask;
|
||||||
|
info.syllable() = buffer->cur().syllable();
|
||||||
|
|
||||||
|
buffer->output_info (info);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
buffer->next_glyph ();
|
||||||
|
}
|
||||||
|
|
||||||
|
buffer->swap_buffers ();
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
reordering (const hb_ot_shape_plan_t *plan,
|
||||||
|
hb_font_t *font,
|
||||||
|
hb_buffer_t *buffer)
|
||||||
|
{
|
||||||
|
insert_dotted_circles (plan, font, buffer);
|
||||||
|
|
||||||
|
hb_glyph_info_t *info = buffer->info;
|
||||||
|
unsigned int count = buffer->len;
|
||||||
|
if (unlikely (!count)) return;
|
||||||
|
unsigned int last = 0;
|
||||||
|
unsigned int last_syllable = info[0].syllable();
|
||||||
|
for (unsigned int i = 1; i < count; i++)
|
||||||
|
if (last_syllable != info[i].syllable()) {
|
||||||
|
reorder_syllable (plan, font->face, buffer, last, i);
|
||||||
|
last = i;
|
||||||
|
last_syllable = info[last].syllable();
|
||||||
|
}
|
||||||
|
reorder_syllable (plan, font->face, buffer, last, count);
|
||||||
|
|
||||||
|
/* Zero syllables now... */
|
||||||
|
for (unsigned int i = 0; i < count; i++)
|
||||||
|
info[i].syllable() = 0;
|
||||||
|
|
||||||
|
HB_BUFFER_DEALLOCATE_VAR (buffer, use_category);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
const hb_ot_complex_shaper_t _hb_ot_complex_shaper_use =
|
||||||
|
{
|
||||||
|
"use",
|
||||||
|
collect_features_use,
|
||||||
|
override_features_use,
|
||||||
|
NULL, /* data_create */
|
||||||
|
NULL, /* data_destroy */
|
||||||
|
NULL, /* preprocess_text */
|
||||||
|
HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
|
||||||
|
NULL, /* decompose */
|
||||||
|
NULL, /* compose */
|
||||||
|
setup_masks_use,
|
||||||
|
HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
|
||||||
|
false, /* fallback_position */
|
||||||
|
};
|
||||||
Loading…
Reference in New Issue