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#
ShapeError

pub suberror ShapeError {
  Font(@moonbit-community/harfbuzz/font.FontError
FontError)
  Layout(@moonbit-community/harfbuzz/ot/tables.OtLayoutError
OtLayoutError)
} derive(Eq, Show, ToJson)

#
Buffer

source

pub struct Buffer {
  infos : Array[GlyphInfo]
  positions : Array[GlyphPosition]
  direction : @moonbit-community/harfbuzz/common.Direction
Direction
  script : @moonbit-community/harfbuzz/common.Script
Script
  language : @moonbit-community/harfbuzz/common.Language
Language
  gsub_features : Array[@moonbit-community/harfbuzz/common.Tag
Tag]
  gpos_features : Array[@moonbit-community/harfbuzz/common.Tag
Tag]
  gsub_features_default : Bool
  gpos_features_default : Bool
  gsub_feature_values : FeatureValues?
  preserve_default_ignorables : Bool
  remove_default_ignorables : Bool
  not_found_variation_selector : UInt?
} derive(Show, ToJson)

Text buffer for shaping.

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Buffer::add_char

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fn Buffer::add_char(self : Buffer, ch : Char, cluster? : Int) -> Unit

Append a character with cluster.

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Buffer::add_codepoint

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fn Buffer::add_codepoint(self : Buffer, codepoint : UInt, cluster? : Int) -> Unit

Append a codepoint with cluster.

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Buffer::add_string

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fn Buffer::add_string(self : Buffer, text : String) -> Unit

Append all characters from a string.

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Buffer::add_tracking

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fn Buffer::add_tracking(self : Buffer, adjustment : Int, horizontal : Bool) -> Unit

Add tracking adjustment to advances.

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Buffer::apply_gpos

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fn Buffer::apply_gpos(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font, include_all_features? : Bool, adjust_mark_offsets? : Bool) -> Result[Bool, ShapeError]

Apply GPOS positioning to the current glyph sequence. Returns true when GPOS was present.

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Buffer::apply_kerx

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fn Buffer::apply_kerx(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

Apply AAT kerx kerning adjustments if present.

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Buffer::apply_morx

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fn Buffer::apply_morx(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

Apply AAT morx/mort substitutions and rearrangements if present.

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Buffer::apply_trak

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fn Buffer::apply_trak(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

Apply AAT trak tracking adjustments if present.

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Buffer::clear

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fn Buffer::clear(self : Buffer) -> Unit

Clear all glyph data.

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Buffer::get_direction

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fn Buffer::get_direction(self : Buffer) -> @moonbit-community/harfbuzz/common.Direction
Direction

Get direction.

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Buffer::get_language

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fn Buffer::get_language(self : Buffer) -> @moonbit-community/harfbuzz/common.Language
Language

Get language.

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Buffer::get_not_found_variation_selector

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fn Buffer::get_not_found_variation_selector(self : Buffer) -> UInt?

Get the fallback glyph for not-found variation selectors.

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Buffer::get_script

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fn Buffer::get_script(self : Buffer) -> @moonbit-community/harfbuzz/common.Script
Script

Get script.

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Buffer::gpos_features

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fn Buffer::gpos_features(self : Buffer) -> ArrayView[@moonbit-community/harfbuzz/common.Tag
Tag]

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Buffer::gsub_features

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fn Buffer::gsub_features(self : Buffer) -> ArrayView[@moonbit-community/harfbuzz/common.Tag
Tag]

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Buffer::guess_segment_properties

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fn Buffer::guess_segment_properties(self : Buffer) -> Unit

Fill missing segment properties with defaults.

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Buffer::has_kerx

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fn Buffer::has_kerx(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Bool, ShapeError]

Return true if kerx data is present.

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Buffer::infos

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fn Buffer::infos(self : Buffer) -> ArrayView[GlyphInfo]

Access glyph infos.

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Buffer::is_empty

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fn Buffer::is_empty(self : Buffer) -> Bool

Return true when empty.

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Buffer::len

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fn Buffer::len(self : Buffer) -> Int

Number of glyphs in the buffer.

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Buffer::merge_clusters

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fn Buffer::merge_clusters(self : Buffer, start : Int, end : Int) -> Unit

Merge clusters in the range [start, end).

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Buffer::merge_combining_mark_clusters

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fn Buffer::merge_combining_mark_clusters(self : Buffer) -> Unit

Merge clusters for base + combining-mark sequences.

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Buffer::new

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fn Buffer::new() -> Buffer

Create an empty buffer.

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Buffer::normalize

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fn Buffer::normalize(self : Buffer) -> Unit

Normalize buffer codepoints by reordering combining marks.

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Buffer::positions

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fn Buffer::positions(self : Buffer) -> ArrayView[GlyphPosition]

Access glyph positions.

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Buffer::replace_glyphs

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fn Buffer::replace_glyphs(self : Buffer, infos : Array[GlyphInfo], positions? : Array[GlyphPosition]) -> Bool

Replace glyph infos and positions. Returns false if lengths mismatch.

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Buffer::serialize

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fn Buffer::serialize(self : Buffer, format? : BufferSerializeFormat, mode? : BufferSerializeMode, start? : Int, end? : Int, no_positions? : Bool, no_clusters? : Bool, no_advances? : Bool) -> String

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Buffer::set_direction

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fn Buffer::set_direction(self : Buffer, direction : @moonbit-community/harfbuzz/common.Direction
Direction) -> Unit

Set direction.

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Buffer::set_gpos_features

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fn Buffer::set_gpos_features(self : Buffer, features : Array[@moonbit-community/harfbuzz/common.Tag
Tag]) -> Unit

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Buffer::set_gsub_feature_values

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fn Buffer::set_gsub_feature_values(self : Buffer, tag : @moonbit-community/harfbuzz/common.Tag
Tag, values : Array[Int]) -> Unit

Set per-glyph GSUB feature values for a specific tag.

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Buffer::set_gsub_features

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fn Buffer::set_gsub_features(self : Buffer, features : Array[@moonbit-community/harfbuzz/common.Tag
Tag]) -> Unit

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Buffer::set_language

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fn Buffer::set_language(self : Buffer, language : @moonbit-community/harfbuzz/common.Language
Language) -> Unit

Set language.

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Buffer::set_not_found_variation_selector

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fn Buffer::set_not_found_variation_selector(self : Buffer, glyph : UInt?) -> Unit

Set the fallback glyph for not-found variation selectors.

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Buffer::set_preserve_default_ignorables

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fn Buffer::set_preserve_default_ignorables(self : Buffer, preserve : Bool) -> Unit

Preserve default-ignorable codepoints (do not hide/zero).

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Buffer::set_remove_default_ignorables

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fn Buffer::set_remove_default_ignorables(self : Buffer, remove : Bool) -> Unit

Remove default-ignorable glyphs instead of zeroing advances.

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Buffer::set_script

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fn Buffer::set_script(self : Buffer, script : @moonbit-community/harfbuzz/common.Script
Script) -> Unit

Set script.

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Buffer::shape_arabic

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fn Buffer::shape_arabic(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_basic

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fn Buffer::shape_basic(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

Populate glyph IDs and advances using cmap + hmtx.

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Buffer::shape_hangul

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fn Buffer::shape_hangul(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_hebrew

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fn Buffer::shape_hebrew(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_indic

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fn Buffer::shape_indic(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_khmer

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fn Buffer::shape_khmer(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_myanmar

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fn Buffer::shape_myanmar(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_ot

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fn Buffer::shape_ot(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font, fallback_position? : Bool) -> Result[Unit, ShapeError]

Shape with GSUB single substitution and GPOS pair adjustment.

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Buffer::shape_thai

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fn Buffer::shape_thai(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font) -> Result[Unit, ShapeError]

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Buffer::shape_use

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fn Buffer::shape_use(self : Buffer, font : @moonbit-community/harfbuzz/font.Font
Font, script_tag? : @moonbit-community/harfbuzz/common.Tag
Tag) -> Result[Unit, ShapeError]

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Buffer::verify

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fn Buffer::verify(self : Buffer) -> Bool

Verify basic buffer invariants (cluster monotonicity and length consistency).

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BufferSerializeFormat

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pub(all) enum BufferSerializeFormat {
  Invalid
  Text
  Json
} derive(Eq, Show)

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BufferSerializeFormat::from_string

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fn BufferSerializeFormat::from_string(s : String, len? : Int) -> BufferSerializeFormat

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BufferSerializeFormat::to_string

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fn BufferSerializeFormat::to_string(self : BufferSerializeFormat) -> String?

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BufferSerializeMode

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pub(all) enum BufferSerializeMode {
  Glyphs
  Unicode
} derive(Eq, Show)

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BufferSerializeMode::from_string

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fn BufferSerializeMode::from_string(s : String, len? : Int) -> BufferSerializeMode

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FeatureValues

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type FeatureValues derive(Show, ToJson)

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GlyphExtents

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type GlyphExtents derive(Show)

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GlyphInfo

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pub struct GlyphInfo {
  codepoint : UInt
  cluster : Int
  unicode : UInt
} derive(Eq, Show, ToJson)

Glyph info entry.

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GlyphPosition

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pub struct GlyphPosition {
  x_advance : Int
  y_advance : Int
  x_offset : Int
  y_offset : Int
} derive(Eq, Show, ToJson)

Glyph positioning data.

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#ShapeError

#Buffer

#Buffer::add_char

#Buffer::add_codepoint

#Buffer::add_string

#Buffer::add_tracking

#Buffer::apply_gpos

#Buffer::apply_kerx

#Buffer::apply_morx

#Buffer::apply_trak

#Buffer::clear

#Buffer::get_direction

#Buffer::get_language

#Buffer::get_not_found_variation_selector

#Buffer::get_script

#Buffer::gpos_features

#Buffer::gsub_features

#Buffer::guess_segment_properties

#Buffer::has_kerx

#Buffer::infos

#Buffer::is_empty

#Buffer::len

#Buffer::merge_clusters

#Buffer::merge_combining_mark_clusters

#Buffer::new

#Buffer::normalize

#Buffer::positions

#Buffer::replace_glyphs

#Buffer::serialize

#Buffer::set_direction

#Buffer::set_gpos_features

#Buffer::set_gsub_feature_values

#Buffer::set_gsub_features

#Buffer::set_language

#Buffer::set_not_found_variation_selector

#Buffer::set_preserve_default_ignorables

#Buffer::set_remove_default_ignorables

#Buffer::set_script

#Buffer::shape_arabic

#Buffer::shape_basic

#Buffer::shape_hangul

#Buffer::shape_hebrew

#Buffer::shape_indic

#Buffer::shape_khmer

#Buffer::shape_myanmar

#Buffer::shape_ot

#Buffer::shape_thai

#Buffer::shape_use

#Buffer::verify

#BufferSerializeFormat

#BufferSerializeFormat::from_string

#BufferSerializeFormat::to_string

#BufferSerializeMode

#BufferSerializeMode::from_string

#FeatureValues

#GlyphExtents

#GlyphInfo

#GlyphPosition

Source Files

#
ShapeError

#
Buffer

#
Buffer::add_char

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Buffer::add_codepoint

#
Buffer::add_string

#
Buffer::add_tracking

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Buffer::apply_gpos

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Buffer::apply_kerx

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Buffer::apply_morx

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Buffer::apply_trak

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Buffer::clear

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Buffer::get_direction

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Buffer::get_language

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Buffer::get_not_found_variation_selector

#
Buffer::get_script

#
Buffer::gpos_features

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Buffer::gsub_features

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Buffer::guess_segment_properties

#
Buffer::has_kerx

#
Buffer::infos

#
Buffer::is_empty

#
Buffer::len

#
Buffer::merge_clusters

#
Buffer::merge_combining_mark_clusters

#
Buffer::new

#
Buffer::normalize

#
Buffer::positions

#
Buffer::replace_glyphs

#
Buffer::serialize

#
Buffer::set_direction

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Buffer::set_gpos_features

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Buffer::set_gsub_feature_values

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Buffer::set_gsub_features

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Buffer::set_language

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Buffer::set_not_found_variation_selector

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Buffer::set_preserve_default_ignorables

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Buffer::set_remove_default_ignorables

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Buffer::set_script

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Buffer::shape_arabic

#
Buffer::shape_basic

#
Buffer::shape_hangul

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Buffer::shape_hebrew

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Buffer::shape_indic

#
Buffer::shape_khmer

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Buffer::shape_myanmar

#
Buffer::shape_ot

#
Buffer::shape_thai

#
Buffer::shape_use

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Buffer::verify

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BufferSerializeFormat

#
BufferSerializeFormat::from_string

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BufferSerializeFormat::to_string

#
BufferSerializeMode

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BufferSerializeMode::from_string

#
FeatureValues

#
GlyphExtents

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GlyphInfo

#
GlyphPosition