FreeType Font Rendering Library

FreeType is a free and open-source software font engine designed to be small, efficient, and highly customizable, capable of producing high-quality glyph images from most vector and bitmap font formats. Originally written by David Turner and Robert Wilhelm in 1996 (FreeType 1), rewritten as FreeType 2 in 2000, it has become the de facto standard font rendering engine used in virtually all major operating systems. Key features: font format support for TrueType (.ttf), OpenType (.otf), Type 1 (PostScript), CFF (Compact Font Format), WOFF/WOFF2, TrueType/OpenType Collections (.ttc/.otc), BDF, PCF, PFR, and Windows FNT/FON. Glyph rendering: rasterization of vector glyph outlines to 8-bit or 32-bit anti-aliased bitmaps, monochrome bitmaps, and raw outline extraction. Hinting: TrueType bytecode interpreter (Apple patents expired in 2010) and auto-hinter for automatic grid-fitting of unhinted fonts. Subpixel rendering with LCD-optimized positioning (RGB/BGR, horizontal/vertical) for improved clarity. CFF2 and variable font support for OpenType 1.8+ with axes for weight, width, slant, and custom design-variation axes. Color font support including COLR/CPAL (layered color glyphs), SVG (vector color glyphs), sbix (bitmap emojis), and CBDT/CBLC (bitmap color). Vertical layout for CJK scripts. TrueType/OpenType table access for low-level font introspection. Charmap handling for Unicode and legacy encodings. Lightweight C library with no external dependencies. Thread-safe. Used by Android, Chrome, Firefox, iOS (via CoreText), Linux (via fontconfig/Pango), and PlayStation. Open source under FTL and GPL-2.0.