OpenType

• OpenType: what's the difference between TTF and OTF??

• FontView - Demo app that displays fonts with a free/libre/open-source text rendering stack: FreeType, HarfBuzz and Raqm

• WOFF

• Fonts

• Rendering text

• photopea/Typr.js: Typr.js - process fonts in Javascript

• opentypejs/opentype.js: Read and write OpenType fonts using JavaScript.

• TTF = OpenType TrueType outlines (glyf/loca data blocks)

• OTF = OpenType Type2 outlines (CFF data block)

OpenType SVG

• https://www.w3.org/2013/10/SVG_in_OpenType/

• https://www.microsoft.com/typography/otspec/svg.htm

• https://wiki.mozilla.org/SVGOpenTypeFonts

• https://github.com/adobe-type-tools/opentype-svg

Color

Font "Apple color Emoji" use sbix table format to store PNG (two sizes) for each glyphs. iOS use special CgBI PNG format

http://typophile.com/node/96671#comment-524375

Version: 2 USHORTS, as usual for TTF tables. Version seems to be 1.1 Num Sizes: ULONG -- 6, for Apple Color Emoji v.8.0d3e1 numSizes * ULONG: offset for size table, relative to the start of the sbix chunk

Each size table starts with Size USHORT Dpi USHORT The sizes in the six tables are 20, 40, 48, 64, 96, and 160 pixels (all individual images appear to be square). Dpi is '72' in all of the tables.

Then follow (numChars + 1) * ULONG offsets from the start of the size table. numChars seems to be taken from the maxp table, plus 1 to add a 'last entry' file size.

Each offset from the start of this table points to: 4 zero bytes "png " / reminiscent of Apple's File Type/Creator data .... raw PNG data

The file size of the PNG data seems to be calculated from the offset to the next image; the last one is empty.

There seems to be no direct link from bitmap index to Unicode or the character map. The first 41 images seems to always be of size 0; inverse parallel to InDesign's Glyph panel, where the first 41 glyphs contain visible vector data (the bitmaps are not visible in InDesign).

COLR/CPAL: systems that support layered color TrueType fonts; this includes Windows 8.1 and later, as well as Mozilla Firefox and other Gecko-based applications running on any platform

• How to generate colour bitmap fonts for Mac OS 10.7/8

• Color bitmapfonts... thanks to Apple?! | Typophile

• Proposed specification to add support for embedded color image glyphs in OpenType fonts

• emoji sbix - Google Search

• mozilla/emojione-colr: EmojiOne font in COLR/CPAL layered format

Variable font

Aka dynamic style

From OpentType 1.8

• Introducing OpenType Variable Fonts – Medium

• The Typekit Blog | Variable fonts, a new kind of font for flexible design

• Variable fonts — Wikipedia

• Variable Fonts on the Web | WebKit

• Axis-Praxis: typesetting with variable fonts (OpenType Variations)

• DECOVAR - A variable decorative sans by David Berlow

• OpenType Font Variations Overview

• Variable Fonts – Support - Application support of variable fonts