Module glyph

Expand description

Processing and drawing glyphs.

Structs§

CachedOutline 🔒: A cached outline glyph path with its precise bounding box.
ColrMetrics 🔒: Helper struct containing computed COLR glyph metrics.
DrawProps 🔒: Properties for easily calculating the transform of a positioned glyph.
FontEmbolden: Synthetic embolden settings for a glyph run.
FontInfo 🔒: Basic metadata about a font.
Glyph: Positioned glyph.
GlyphBitmap 🔒: A glyph defined by a bitmap.
GlyphCaches: Caches used for glyph rendering.
GlyphColr: A glyph defined by a COLR glyph description.
GlyphOutline 🔒: A glyph defined by a path (its outline) and a local transform.
GlyphPrepCache: Caches used for preparing glyph drawing.
GlyphPrepCacheMut: Mutably borrowed caches used for preparing glyph drawing.
GlyphRun: A sequence of glyphs with shared rendering properties.
GlyphRunBuilder: A builder for configuring and drawing glyphs.
GlyphRunRenderer: Helper struct for rendering a prepared glyph run.
GlyphScaleProperties 🔒
HintCache: LRU cache for hinting instances.
HintEntry 🔒
HintKey: Hint key for hinting instances.
OutlineCache: Caches glyph outlines for reuse. Heavily inspired by vello_encoding::glyph_cache.
OutlineCacheSession 🔒
OutlineEntry 🔒
OutlineKey 🔒
OutlinePath 🔒
PreparedGlyph 🔒: A simplified representation of a glyph, prepared for easy rendering.
PreparedGlyphRun 🔒
VarLookupKey 🔒: Lookup key for variable font caches.

AtlasCacher: Determines whether atlas-backed glyph caching is available for a draw.
CachedGlyphType 🔒: Type hint for cached glyph rendering.
GlyphType 🔒: A type of glyph.
Style 🔒: Rendering style for glyphs.

BLACK_PACKED 🔒: Pre-packed BLACK color as a u32 for use in GlyphCacheKey.
HINTING_OPTIONS 🔒
MAX_CACHED_HINT_INSTANCES 🔒: We keep this small to enable a simple LRU cache with a linear search. Regenerating hinting data is low to medium cost so it’s fine to redo it occasionally.

calculate_bitmap_transform 🔒: Calculate transform for bitmap glyphs.
calculate_colr_metrics 🔒: Calculate COLR glyph metrics (scale factors, bounding box, etc.).
calculate_colr_transform 🔒: Calculate transform for COLR glyphs.
calculate_outline_transform 🔒: Calculate transform for outline glyphs.
create_bitmap_glyph 🔒: Create bitmap glyph data.
create_colr_glyph 🔒: Create COLR glyph data with intermediate texture parameters.
create_outline_glyph 🔒: Create outline glyph data from cache.
expand_rect_with_segment 🔒
f32_bits 🔒
find_hint_entry 🔒
insert_and_merge_range 🔒: Insert a range into a sorted list, merging with any overlapping ranges.
join_bits 🔒
prepare_glyph_run 🔒: Prepare a glyph run for rendering.
x_y_advances 🔒

NormalizedCoord: A normalized variation coordinate (for variable fonts) in 2.14 fixed point format.
VarKey 🔒: Key for variable font caches.