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Overlays a heatmap or debug visualization on rendered glyphs to inspect shaping decisions and metrics.
Distinct from Text Shaping: Distinct from Text Shaping: focuses on debug visualization of shaping decisions, not the shaping process itself.
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HarfBuzz is a text shaping engine that converts Unicode text into correctly positioned glyphs for any writing system. It processes OpenType layout features, substitution rules, and positioning tables to produce shaped glyph sequences from font data, and also handles Apple Advanced Typography font tables. The library provides a stable C API that abstracts over platform-specific font access and rendering backends, and includes a font table caching layer to avoid redundant parsing during repeated shaping operations. The project implements script-specific shaping logic for complex writing systems
Overlays a heatmap or debug visualization on rendered glyphs to inspect shaping decisions and metrics.