551 lines
15 KiB
C++
551 lines
15 KiB
C++
/*
|
|
* Copyright © 2011,2012,2013 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
|
|
*/
|
|
|
|
#include "hb-ot-shape-complex-indic-private.hh"
|
|
|
|
/* buffer var allocations */
|
|
#define myanmar_category() complex_var_u8_0() /* myanmar_category_t */
|
|
#define myanmar_position() complex_var_u8_1() /* myanmar_position_t */
|
|
|
|
|
|
/*
|
|
* Myanmar shaper.
|
|
*/
|
|
|
|
static const hb_tag_t
|
|
basic_features[] =
|
|
{
|
|
/*
|
|
* Basic features.
|
|
* These features are applied in order, one at a time, after initial_reordering.
|
|
*/
|
|
HB_TAG('r','p','h','f'),
|
|
HB_TAG('p','r','e','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'),
|
|
/* Pre-release version of Windows 8 Myanmar font had abvm,blwm
|
|
* features. The released Windows 8 version of the font (as well
|
|
* as the released spec) used 'mark' instead. The Windows 8
|
|
* shaper however didn't apply 'mark' but did apply 'mkmk'.
|
|
* Perhaps it applied abvm/blwm. This was fixed in a Windows 8
|
|
* update, so now it applies mark/mkmk. We are guessing that
|
|
* it still applies abvm/blwm too.
|
|
*/
|
|
HB_TAG('a','b','v','m'),
|
|
HB_TAG('b','l','w','m'),
|
|
};
|
|
|
|
static void
|
|
setup_syllables (const hb_ot_shape_plan_t *plan,
|
|
hb_font_t *font,
|
|
hb_buffer_t *buffer);
|
|
static void
|
|
initial_reordering (const hb_ot_shape_plan_t *plan,
|
|
hb_font_t *font,
|
|
hb_buffer_t *buffer);
|
|
static void
|
|
final_reordering (const hb_ot_shape_plan_t *plan,
|
|
hb_font_t *font,
|
|
hb_buffer_t *buffer);
|
|
|
|
static void
|
|
collect_features_myanmar (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'));
|
|
|
|
|
|
map->add_gsub_pause (initial_reordering);
|
|
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 (final_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_myanmar (hb_ot_shape_planner_t *plan)
|
|
{
|
|
plan->map.add_feature (HB_TAG('l','i','g','a'), 0, F_GLOBAL);
|
|
}
|
|
|
|
|
|
enum syllable_type_t {
|
|
consonant_syllable,
|
|
punctuation_cluster,
|
|
broken_cluster,
|
|
non_myanmar_cluster,
|
|
};
|
|
|
|
#include "hb-ot-shape-complex-myanmar-machine.hh"
|
|
|
|
|
|
/* Note: This enum is duplicated in the -machine.rl source file.
|
|
* Not sure how to avoid duplication. */
|
|
enum myanmar_category_t {
|
|
OT_As = 18, /* Asat */
|
|
OT_D = 19, /* Digits except zero */
|
|
OT_D0 = 20, /* Digit zero */
|
|
OT_DB = OT_N, /* Dot below */
|
|
OT_GB = OT_PLACEHOLDER,
|
|
OT_MH = 21, /* Various consonant medial types */
|
|
OT_MR = 22, /* Various consonant medial types */
|
|
OT_MW = 23, /* Various consonant medial types */
|
|
OT_MY = 24, /* Various consonant medial types */
|
|
OT_PT = 25, /* Pwo and other tones */
|
|
OT_VAbv = 26,
|
|
OT_VBlw = 27,
|
|
OT_VPre = 28,
|
|
OT_VPst = 29,
|
|
OT_VS = 30, /* Variation selectors */
|
|
OT_P = 31 /* Punctuation */
|
|
};
|
|
|
|
|
|
static inline bool
|
|
is_one_of (const hb_glyph_info_t &info, unsigned int flags)
|
|
{
|
|
/* If it ligated, all bets are off. */
|
|
if (_hb_glyph_info_ligated (&info)) return false;
|
|
return !!(FLAG (info.myanmar_category()) & flags);
|
|
}
|
|
|
|
static inline bool
|
|
is_consonant (const hb_glyph_info_t &info)
|
|
{
|
|
return is_one_of (info, CONSONANT_FLAGS);
|
|
}
|
|
|
|
|
|
static inline void
|
|
set_myanmar_properties (hb_glyph_info_t &info)
|
|
{
|
|
hb_codepoint_t u = info.codepoint;
|
|
unsigned int type = hb_indic_get_categories (u);
|
|
indic_category_t cat = (indic_category_t) (type & 0x7F);
|
|
indic_position_t pos = (indic_position_t) (type >> 8);
|
|
|
|
/* Myanmar
|
|
* http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm#analyze
|
|
*/
|
|
if (unlikely (hb_in_range<hb_codepoint_t> (u, 0xFE00, 0xFE0F)))
|
|
cat = (indic_category_t) OT_VS;
|
|
|
|
switch (u)
|
|
{
|
|
case 0x104E:
|
|
cat = (indic_category_t) OT_C; /* The spec says C, IndicSyllableCategory doesn't have. */
|
|
break;
|
|
|
|
case 0x002D: case 0x00A0: case 0x00D7: case 0x2012:
|
|
case 0x2013: case 0x2014: case 0x2015: case 0x2022:
|
|
case 0x25CC: case 0x25FB: case 0x25FC: case 0x25FD:
|
|
case 0x25FE:
|
|
cat = (indic_category_t) OT_GB;
|
|
break;
|
|
|
|
case 0x1004: case 0x101B: case 0x105A:
|
|
cat = (indic_category_t) OT_Ra;
|
|
break;
|
|
|
|
case 0x1032: case 0x1036:
|
|
cat = (indic_category_t) OT_A;
|
|
break;
|
|
|
|
case 0x103A:
|
|
cat = (indic_category_t) OT_As;
|
|
break;
|
|
|
|
case 0x1041: case 0x1042: case 0x1043: case 0x1044:
|
|
case 0x1045: case 0x1046: case 0x1047: case 0x1048:
|
|
case 0x1049: case 0x1090: case 0x1091: case 0x1092:
|
|
case 0x1093: case 0x1094: case 0x1095: case 0x1096:
|
|
case 0x1097: case 0x1098: case 0x1099:
|
|
cat = (indic_category_t) OT_D;
|
|
break;
|
|
|
|
case 0x1040:
|
|
cat = (indic_category_t) OT_D; /* XXX The spec says D0, but Uniscribe doesn't seem to do. */
|
|
break;
|
|
|
|
case 0x103E: case 0x1060:
|
|
cat = (indic_category_t) OT_MH;
|
|
break;
|
|
|
|
case 0x103C:
|
|
cat = (indic_category_t) OT_MR;
|
|
break;
|
|
|
|
case 0x103D: case 0x1082:
|
|
cat = (indic_category_t) OT_MW;
|
|
break;
|
|
|
|
case 0x103B: case 0x105E: case 0x105F:
|
|
cat = (indic_category_t) OT_MY;
|
|
break;
|
|
|
|
case 0x1063: case 0x1064: case 0x1069: case 0x106A:
|
|
case 0x106B: case 0x106C: case 0x106D: case 0xAA7B:
|
|
cat = (indic_category_t) OT_PT;
|
|
break;
|
|
|
|
case 0x1038: case 0x1087: case 0x1088: case 0x1089:
|
|
case 0x108A: case 0x108B: case 0x108C: case 0x108D:
|
|
case 0x108F: case 0x109A: case 0x109B: case 0x109C:
|
|
cat = (indic_category_t) OT_SM;
|
|
break;
|
|
|
|
case 0x104A: case 0x104B:
|
|
cat = (indic_category_t) OT_P;
|
|
break;
|
|
}
|
|
|
|
if (cat == OT_M)
|
|
{
|
|
switch ((int) pos)
|
|
{
|
|
case POS_PRE_C: cat = (indic_category_t) OT_VPre;
|
|
pos = POS_PRE_M; break;
|
|
case POS_ABOVE_C: cat = (indic_category_t) OT_VAbv; break;
|
|
case POS_BELOW_C: cat = (indic_category_t) OT_VBlw; break;
|
|
case POS_POST_C: cat = (indic_category_t) OT_VPst; break;
|
|
}
|
|
}
|
|
|
|
info.myanmar_category() = (myanmar_category_t) cat;
|
|
info.myanmar_position() = pos;
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
setup_masks_myanmar (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
|
hb_buffer_t *buffer,
|
|
hb_font_t *font HB_UNUSED)
|
|
{
|
|
HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_category);
|
|
HB_BUFFER_ALLOCATE_VAR (buffer, myanmar_position);
|
|
|
|
/* We cannot setup masks here. We save information about characters
|
|
* and setup masks later on in a pause-callback. */
|
|
|
|
unsigned int count = buffer->len;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
set_myanmar_properties (buffer->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 int
|
|
compare_myanmar_order (const hb_glyph_info_t *pa, const hb_glyph_info_t *pb)
|
|
{
|
|
int a = pa->myanmar_position();
|
|
int b = pb->myanmar_position();
|
|
|
|
return a < b ? -1 : a == b ? 0 : +1;
|
|
}
|
|
|
|
|
|
/* Rules from:
|
|
* http://www.microsoft.com/typography/OpenTypeDev/myanmar/intro.htm */
|
|
|
|
static void
|
|
initial_reordering_consonant_syllable (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;
|
|
|
|
unsigned int base = end;
|
|
bool has_reph = false;
|
|
|
|
{
|
|
unsigned int limit = start;
|
|
if (start + 3 <= end &&
|
|
info[start ].myanmar_category() == OT_Ra &&
|
|
info[start+1].myanmar_category() == OT_As &&
|
|
info[start+2].myanmar_category() == OT_H)
|
|
{
|
|
limit += 3;
|
|
base = start;
|
|
has_reph = true;
|
|
}
|
|
|
|
{
|
|
if (!has_reph)
|
|
base = limit;
|
|
|
|
for (unsigned int i = limit; i < end; i++)
|
|
if (is_consonant (info[i]))
|
|
{
|
|
base = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Reorder! */
|
|
{
|
|
unsigned int i = start;
|
|
for (; i < start + (has_reph ? 3 : 0); i++)
|
|
info[i].myanmar_position() = POS_AFTER_MAIN;
|
|
for (; i < base; i++)
|
|
info[i].myanmar_position() = POS_PRE_C;
|
|
if (i < end)
|
|
{
|
|
info[i].myanmar_position() = POS_BASE_C;
|
|
i++;
|
|
}
|
|
indic_position_t pos = POS_AFTER_MAIN;
|
|
/* The following loop may be ugly, but it implements all of
|
|
* Myanmar reordering! */
|
|
for (; i < end; i++)
|
|
{
|
|
if (info[i].myanmar_category() == OT_MR) /* Pre-base reordering */
|
|
{
|
|
info[i].myanmar_position() = POS_PRE_C;
|
|
continue;
|
|
}
|
|
if (info[i].myanmar_position() < POS_BASE_C) /* Left matra */
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if (pos == POS_AFTER_MAIN && info[i].myanmar_category() == OT_VBlw)
|
|
{
|
|
pos = POS_BELOW_C;
|
|
info[i].myanmar_position() = pos;
|
|
continue;
|
|
}
|
|
|
|
if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_A)
|
|
{
|
|
info[i].myanmar_position() = POS_BEFORE_SUB;
|
|
continue;
|
|
}
|
|
if (pos == POS_BELOW_C && info[i].myanmar_category() == OT_VBlw)
|
|
{
|
|
info[i].myanmar_position() = pos;
|
|
continue;
|
|
}
|
|
if (pos == POS_BELOW_C && info[i].myanmar_category() != OT_A)
|
|
{
|
|
pos = POS_AFTER_SUB;
|
|
info[i].myanmar_position() = pos;
|
|
continue;
|
|
}
|
|
info[i].myanmar_position() = pos;
|
|
}
|
|
}
|
|
|
|
buffer->merge_clusters (start, end);
|
|
/* Sit tight, rock 'n roll! */
|
|
hb_bubble_sort (info + start, end - start, compare_myanmar_order);
|
|
}
|
|
|
|
static void
|
|
initial_reordering_broken_cluster (const hb_ot_shape_plan_t *plan,
|
|
hb_face_t *face,
|
|
hb_buffer_t *buffer,
|
|
unsigned int start, unsigned int end)
|
|
{
|
|
/* We already inserted dotted-circles, so just call the consonant_syllable. */
|
|
initial_reordering_consonant_syllable (plan, face, buffer, start, end);
|
|
}
|
|
|
|
static void
|
|
initial_reordering_punctuation_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
|
hb_face_t *face HB_UNUSED,
|
|
hb_buffer_t *buffer HB_UNUSED,
|
|
unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
|
|
{
|
|
/* Nothing to do right now. If we ever switch to using the output
|
|
* buffer in the reordering process, we'd need to next_glyph() here. */
|
|
}
|
|
|
|
static void
|
|
initial_reordering_non_myanmar_cluster (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
|
hb_face_t *face HB_UNUSED,
|
|
hb_buffer_t *buffer HB_UNUSED,
|
|
unsigned int start HB_UNUSED, unsigned int end HB_UNUSED)
|
|
{
|
|
/* Nothing to do right now. If we ever switch to using the output
|
|
* buffer in the reordering process, we'd need to next_glyph() here. */
|
|
}
|
|
|
|
|
|
static void
|
|
initial_reordering_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) {
|
|
case consonant_syllable: initial_reordering_consonant_syllable (plan, face, buffer, start, end); return;
|
|
case punctuation_cluster: initial_reordering_punctuation_cluster (plan, face, buffer, start, end); return;
|
|
case broken_cluster: initial_reordering_broken_cluster (plan, face, buffer, start, end); return;
|
|
case non_myanmar_cluster: initial_reordering_non_myanmar_cluster (plan, face, buffer, start, end); return;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
|
|
hb_font_t *font,
|
|
hb_buffer_t *buffer)
|
|
{
|
|
/* Note: This loop is extra overhead, but should not be measurable. */
|
|
bool has_broken_syllables = false;
|
|
unsigned int count = buffer->len;
|
|
for (unsigned int i = 0; i < count; i++)
|
|
if ((buffer->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 (0x25CC, 0, &dottedcircle_glyph))
|
|
return;
|
|
|
|
hb_glyph_info_t dottedcircle = {0};
|
|
dottedcircle.codepoint = 0x25CC;
|
|
set_myanmar_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 ();
|
|
}
|
|
|
|
static void
|
|
initial_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()) {
|
|
initial_reordering_syllable (plan, font->face, buffer, last, i);
|
|
last = i;
|
|
last_syllable = info[last].syllable();
|
|
}
|
|
initial_reordering_syllable (plan, font->face, buffer, last, count);
|
|
}
|
|
|
|
static void
|
|
final_reordering (const hb_ot_shape_plan_t *plan,
|
|
hb_font_t *font HB_UNUSED,
|
|
hb_buffer_t *buffer)
|
|
{
|
|
hb_glyph_info_t *info = buffer->info;
|
|
unsigned int count = buffer->len;
|
|
|
|
/* Zero syllables now... */
|
|
for (unsigned int i = 0; i < count; i++)
|
|
info[i].syllable() = 0;
|
|
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_category);
|
|
HB_BUFFER_DEALLOCATE_VAR (buffer, myanmar_position);
|
|
}
|
|
|
|
|
|
const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
|
|
{
|
|
"myanmar",
|
|
collect_features_myanmar,
|
|
override_features_myanmar,
|
|
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_myanmar,
|
|
HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY,
|
|
false, /* fallback_position */
|
|
};
|