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use alloc::boxed::Box;
use core::any::Any;
use crate::hb::unicode::Codepoint;
use super::buffer::*;
use super::common::TagExt;
use super::ot_shape::*;
use super::ot_shape_normalize::*;
use super::ot_shape_plan::hb_ot_shape_plan_t;
use super::{hb_font_t, hb_tag_t, script, Direction, Script};
impl GlyphInfo {
declare_buffer_var!(
u8,
2,
2,
OT_SHAPER_VAR_U8_CATEGORY_VAR,
ot_shaper_var_u8_category,
set_ot_shaper_var_u8_category
);
declare_buffer_var!(
u8,
2,
3,
OT_SHAPER_VAR_U8_AUXILIARY_VAR,
ot_shaper_var_u8_auxiliary,
set_ot_shaper_var_u8_auxiliary
);
}
pub const MAX_COMBINING_MARKS: usize = 32;
pub type hb_ot_shape_zero_width_marks_type_t = u32;
pub const HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE: u32 = 0;
pub const HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_EARLY: u32 = 1;
pub const HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE: u32 = 2;
pub type DecomposeFn =
fn(&hb_ot_shape_normalize_context_t, Codepoint) -> Option<(Codepoint, Codepoint)>;
pub type ComposeFn =
fn(&hb_ot_shape_normalize_context_t, Codepoint, Codepoint) -> Option<Codepoint>;
pub const DEFAULT_SHAPER: hb_ot_shaper_t = hb_ot_shaper_t {
collect_features: None,
override_features: None,
create_data: None,
preprocess_text: None,
postprocess_glyphs: None,
normalization_preference: HB_OT_SHAPE_NORMALIZATION_MODE_AUTO,
decompose: None,
compose: None,
setup_masks: None,
gpos_tag: None,
reorder_marks: None,
zero_width_marks: HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
fallback_position: true,
};
pub struct hb_ot_shaper_t {
/// Called during `shape_plan()`.
/// Shapers should use plan.map to add their features and callbacks.
pub collect_features: Option<fn(&mut hb_ot_shape_planner_t)>,
/// Called during `shape_plan()`.
/// Shapers should use plan.map to override features and add callbacks after
/// common features are added.
pub override_features: Option<fn(&mut hb_ot_shape_planner_t)>,
/// Called at the end of `shape_plan()`.
/// Whatever shapers return will be accessible through `plan.data()` later.
pub create_data: Option<fn(&hb_ot_shape_plan_t) -> Box<dyn Any + Send + Sync>>,
/// Called during `shape()`.
/// Shapers can use to modify text before shaping starts.
pub preprocess_text: Option<fn(&hb_ot_shape_plan_t, &hb_font_t, &mut hb_buffer_t)>,
/// Called during `shape()`.
/// Shapers can use to modify text before shaping starts.
pub postprocess_glyphs: Option<fn(&hb_ot_shape_plan_t, &hb_font_t, &mut hb_buffer_t)>,
/// How to normalize.
pub normalization_preference: hb_ot_shape_normalization_mode_t,
/// Called during `shape()`'s normalization.
pub decompose: Option<DecomposeFn>,
/// Called during `shape()`'s normalization.
pub compose: Option<ComposeFn>,
/// Called during `shape()`.
/// Shapers should use map to get feature masks and set on buffer.
/// Shapers may NOT modify characters.
pub setup_masks: Option<fn(&hb_ot_shape_plan_t, &hb_font_t, &mut hb_buffer_t)>,
/// If not `None`, then must match found GPOS script tag for
/// GPOS to be applied. Otherwise, fallback positioning will be used.
pub gpos_tag: Option<hb_tag_t>,
/// Called during `shape()`.
/// Shapers can use to modify ordering of combining marks.
pub reorder_marks: Option<fn(&hb_ot_shape_plan_t, &mut hb_buffer_t, usize, usize)>,
/// If and when to zero-width marks.
pub zero_width_marks: hb_ot_shape_zero_width_marks_type_t,
/// Whether to use fallback mark positioning.
pub fallback_position: bool,
}
// Same as default but no mark advance zeroing / fallback positioning.
// Dumbest shaper ever, basically.
pub const DUMBER_SHAPER: hb_ot_shaper_t = hb_ot_shaper_t {
collect_features: None,
override_features: None,
create_data: None,
preprocess_text: None,
postprocess_glyphs: None,
normalization_preference: HB_OT_SHAPE_NORMALIZATION_MODE_AUTO,
decompose: None,
compose: None,
setup_masks: None,
gpos_tag: None,
reorder_marks: None,
zero_width_marks: HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE,
fallback_position: false,
};
pub fn hb_ot_shape_complex_categorize(
script: Script,
direction: Direction,
gsub_script: Option<hb_tag_t>,
) -> &'static hb_ot_shaper_t {
match script {
// Unicode-1.1 additions
script::ARABIC
// Unicode-3.0 additions
| script::SYRIAC => {
// For Arabic script, use the Arabic shaper even if no OT script tag was found.
// This is because we do fallback shaping for Arabic script (and not others).
// But note that Arabic shaping is applicable only to horizontal layout; for
// vertical text, just use the generic shaper instead.
//
// TODO: Does this still apply? Arabic fallback shaping was removed.
if (gsub_script != Some(hb_tag_t::default_script()) || script == script::ARABIC)
&& direction.is_horizontal()
{
&crate::hb::ot_shaper_arabic::ARABIC_SHAPER
} else {
&DEFAULT_SHAPER
}
}
// Unicode-1.1 additions
script::THAI
| script::LAO => &crate::hb::ot_shaper_thai::THAI_SHAPER,
// Unicode-1.1 additions
script::HANGUL => &crate::hb::ot_shaper_hangul::HANGUL_SHAPER,
// Unicode-1.1 additions
script::HEBREW => &crate::hb::ot_shaper_hebrew::HEBREW_SHAPER,
// Unicode-1.1 additions
script::BENGALI
| script::DEVANAGARI
| script::GUJARATI
| script::GURMUKHI
| script::KANNADA
| script::MALAYALAM
| script::ORIYA
| script::TAMIL
| script::TELUGU => {
// If the designer designed the font for the 'DFLT' script,
// (or we ended up arbitrarily pick 'latn'), use the default shaper.
// Otherwise, use the specific shaper.
//
// If it's indy3 tag, send to USE.
if gsub_script == Some(hb_tag_t::default_script()) ||
gsub_script == Some(hb_tag_t::new(b"latn")) {
&DEFAULT_SHAPER
} else if gsub_script.is_some_and(|tag| tag.to_be_bytes()[3] == b'3') {
&crate::hb::ot_shaper_use::UNIVERSAL_SHAPER
} else {
&crate::hb::ot_shaper_indic::INDIC_SHAPER
}
}
script::KHMER => &crate::hb::ot_shaper_khmer::KHMER_SHAPER,
script::MYANMAR => {
// If the designer designed the font for the 'DFLT' script,
// (or we ended up arbitrarily pick 'latn'), use the default shaper.
// Otherwise, use the specific shaper.
//
// If designer designed for 'mymr' tag, also send to default
// shaper. That's tag used from before Myanmar shaping spec
// was developed. The shaping spec uses 'mym2' tag.
if gsub_script == Some(hb_tag_t::default_script()) ||
gsub_script == Some(hb_tag_t::new(b"latn")) ||
gsub_script == Some(hb_tag_t::new(b"mymr"))
{
&DEFAULT_SHAPER
} else {
&crate::hb::ot_shaper_myanmar::MYANMAR_SHAPER
}
}
// https://github.com/harfbuzz/harfbuzz/issues/1162
script::MYANMAR_ZAWGYI => &crate::hb::ot_shaper_myanmar::MYANMAR_ZAWGYI_SHAPER,
// Unicode-2.0 additions
script::TIBETAN
// Unicode-3.0 additions
| script::MONGOLIAN
| script::SINHALA
// Unicode-3.2 additions
| script::BUHID
| script::HANUNOO
| script::TAGALOG
| script::TAGBANWA
// Unicode-4.0 additions
| script::LIMBU
| script::TAI_LE
// Unicode-4.1 additions
| script::BUGINESE
| script::KHAROSHTHI
| script::SYLOTI_NAGRI
| script::TIFINAGH
// Unicode-5.0 additions
| script::BALINESE
| script::NKO
| script::PHAGS_PA
// Unicode-5.1 additions
| script::CHAM
| script::KAYAH_LI
| script::LEPCHA
| script::REJANG
| script::SAURASHTRA
| script::SUNDANESE
// Unicode-5.2 additions
| script::EGYPTIAN_HIEROGLYPHS
| script::JAVANESE
| script::KAITHI
| script::MEETEI_MAYEK
| script::TAI_THAM
| script::TAI_VIET
// Unicode-6.0 additions
| script::BATAK
| script::BRAHMI
| script::MANDAIC
// Unicode-6.1 additions
| script::CHAKMA
| script::MIAO
| script::SHARADA
| script::TAKRI
// Unicode-7.0 additions
| script::DUPLOYAN
| script::GRANTHA
| script::KHOJKI
| script::KHUDAWADI
| script::MAHAJANI
| script::MANICHAEAN
| script::MODI
| script::PAHAWH_HMONG
| script::PSALTER_PAHLAVI
| script::SIDDHAM
| script::TIRHUTA
// Unicode-8.0 additions
| script::AHOM
| script::MULTANI
// Unicode-9.0 additions
| script::ADLAM
| script::BHAIKSUKI
| script::MARCHEN
| script::NEWA
// Unicode-10.0 additions
| script::MASARAM_GONDI
| script::SOYOMBO
| script::ZANABAZAR_SQUARE
// Unicode-11.0 additions
| script::DOGRA
| script::GUNJALA_GONDI
| script::HANIFI_ROHINGYA
| script::MAKASAR
| script::MEDEFAIDRIN
| script::OLD_SOGDIAN
| script::SOGDIAN
// Unicode-12.0 additions
| script::ELYMAIC
| script::NANDINAGARI
| script::NYIAKENG_PUACHUE_HMONG
| script::WANCHO
// Unicode-13.0 additions
| script::CHORASMIAN
| script::DIVES_AKURU
| script::KHITAN_SMALL_SCRIPT
| script::YEZIDI
// Unicode-14.0 additions
| script::CYPRO_MINOAN
| script::OLD_UYGHUR
| script::TANGSA
| script::TOTO
| script::VITHKUQI
// Unicode-15.0 additions
| script::KAWI
| script::NAG_MUNDARI
// Unicode-16.0 additions
| script::GARAY
| script::GURUNG_KHEMA
| script::KIRAT_RAI
| script::OL_ONAL
| script::SUNUWAR
| script::TODHRI
| script::TULU_TIGALARI
// Unicode-17.0 additions
| script::BERIA_ERFE
| script::SIDETIC
| script::TAI_YO
| script::TOLONG_SIKI
=> {
// If the designer designed the font for the 'DFLT' script,
// (or we ended up arbitrarily pick 'latn'), use the default shaper.
// Otherwise, use the specific shaper.
// Note that for some simple scripts, there may not be *any*
// GSUB/GPOS needed, so there may be no scripts found!
if gsub_script == Some(hb_tag_t::default_script()) ||
gsub_script == Some(hb_tag_t::new(b"latn")) {
&DEFAULT_SHAPER
} else {
&crate::hb::ot_shaper_use::UNIVERSAL_SHAPER
}
}
_ => &DEFAULT_SHAPER
}
}