CBDT/CBLC
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CBDT
Design & TypographyTabla de datos de mapa de bits a color y tabla de ubicación de mapa de bits a color — tablas OpenType para incrustar emoji de color en formato de mapa de bits dentro de fuentes.
CBDT (Color Bitmap Data Table) and CBLC (Color Bitmap Location Table) store pre-rendered color bitmap images directly in an OpenType font file. Google Noto Color Emoji uses this format.CBLC provides an index mapping glyphs to their bitmap data locations, while CBDT contains the actual image data (typically PNG). Multiple "strike" sizes can be included for different display resolutions.
While CBDT produces consistent, high-quality results, the embedded bitmaps make font files large. Google's Noto Color Emoji font is approximately 10MB, compared to kilobytes for a standard text font.