Crate zng_ext_font

Font loading, text segmenting and shaping.

Crate

This crate is part of the zng project.

Cargo Features

This crate provides 2 feature flags, 0 enabled by default.

"hyphenation_embed_all"

Embed hyphenation dictionaries.

See the hyphenation for more details.

"svg"

Enable support for SVG image glyphs.

This feature signals that the IMAGES service supports SVG. The app must ensure that this is so by using zng-ext-svg or another SVG extension.

Modules

• font_features
  Font features and variation types.

Macros

• font_variations
  Initialize a FontVariations map.

Structs

• BidiLevel
  Embedding Level
• CaretIndex
  Defines an insert offset in a shaped text.
• ColorGlyph
  Represents all layer glyphs selected by the font to replace a colored glyph.
• ColorGlyphs
  COLR table.
• ColorPalette
  Represents a color palette entry.
• ColorPaletteType
  Represents a color palette v1 flag.
• ColorPalettes
  CPAL table.
• CustomFont
  Custom font builder.
• FONTS
  Font loading, custom fonts and app font configuration.
• Font
  A sized font face.
• FontChangedArgs
  FONT_CHANGED_EVENT arguments.
• FontDataRef
  Reference to in memory font data.
• FontFace
  A font face selected from a font family.
• FontFaceList
  A list of FontFace resolved from a FontName list, plus the fallback font.
• FontFaceMetrics
  Various metrics that apply to the entire FontFace.
• FontList
  A list of Font created from a FontFaceList.
• FontManager
  Application extension that manages text fonts.
• FontMetrics
  Various metrics about a Font.
• FontName
  Font family name.
• FontNames
  A list of font names in priority order.
• FontStretch
  The width of a font as an approximate fraction of the normal width.
• FontWeight
  The degree of stroke thickness of a font. This value ranges from 100.0 to 900.0, with 400.0 as normal.
• GenericFonts
  Generic fonts configuration for the app.
• HYPHENATION
  Hyphenation service.
• HyphenationDataDir
  Represents a hyphenation data source that searches a directory.
• HyphenationDataEmbedded
  Represents embedded hyphenation data.
• LayoutDirections
  Identifies what direction segments a ShapedLine has.
• SegmentedText
  A string segmented in sequences of words, spaces, tabs and separated line breaks.
• SegmentedTextIter
  Segmented text iterator.
• ShapedLine
  Represents a line selection of a ShapedText.
• ShapedSegment
  Represents a word or space selection of a ShapedText.
• ShapedText
  Output of text layout.
• TextOverflowInfo
  Info about a shaped text overflow in constraint.
• TextSegment
  Represents a single text segment in a SegmentedText.
• TextShapingArgs
  Extra configuration for shape_text.

Enums

• FontChange
  Possible changes in a FontChangedArgs.
• FontColorPalette
  Color palette selector for colored fonts.
• FontLoadingError
  Reasons why a loader might fail to load a font.
• FontStyle
  The italic or oblique form of a font.
• GlyphLoadingError
  Reasons why a font might fail to load a glyph.
• Hyphens
  Hyphenation mode.
• Justify
  Text alignment justification mode.
• LineBreak
  Configuration of text wrapping for Chinese, Japanese, or Korean text.
• ShapedColoredGlyphs
  Represents normal and colored glyphs in ShapedText::colored_glyphs.
• ShapedImageGlyphs
  Represents normal and image glyphs in ShapedText::image_glyphs.
• TextSegmentKind
  The type of an inline/text segment.
• TextTransformFn
  Text transform function.
• WhiteSpace
  Text white space transform.
• WordBreak
  Configure line breaks inside words during text wrap.

Statics

• FONT_CHANGED_EVENT
  Change in FONTS that may cause a font query to now give a different result.

Traits

• HyphenationDataSource
  Represents a hyphenation dictionary source.
• OutlineSink
  Receives Bézier path rendering commands from Font::outline.

Functions

• f32_cmp
  f32 comparison, panics for NaN.
• unicode_bidi_levels
  Compute initial bidirectional levels of each segment of a line.
• unicode_bidi_sort
  Compute a map of segments in line to their final LTR display order.

Type Aliases

• FontSize
  Text font size.
• LetterSpacing
  Extra spacing added in between text letters.
• LineHeight
  Text line height.
• LineSpacing
  Extra spacing in-between text lines.
• ParagraphSpacing
  Extra spacing in-between paragraphs.
• TabLength
  Length of a TAB space.
• TextLineThickness
  Height of the text overline or strikethrough decoration.
• UnderlineThickness
  Height of the text underline decoration.
• WordSpacing
  Extra spacing added to the Unicode U+0020 SPACE character.