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OpenType uses the general sfnt structure of a TrueType font, but it adds several smartfont options that enhance the font's typographic and language support capabilities. The glyph outline data in an OpenType font may be in one of two formats: either TrueType format outlines in a 'glyf' table, or Compact Font Format (CFF) outlines in a 'CFF ' table.
Text shaping is the process of converting text to glyph indices and positions as part of text rendering. [1] It is complementary to font rendering as part of the text rendering process; font rendering is used to generate the glyphs, and text shaping decides which glyphs to render and where they should be put on the image plane. [2]
Typography utilized to characterize text: Typography is intended to reveal the character of the text. Through the use of typography, a body of text can instantaneously reveal the mood the author intends to convey to its readers. The message that a body of text conveys has a direct relationship with the typeface that is chosen.
Some web browsers also support OpenType features in accordance with the CSS Fonts Module Level 3 specification, which allows OpenType features to be set directly via the font-feature-settings property, or indirectly by means of higher-level mechanisms. The following tables list the features defined in version 1.8.1 of the OpenType specification.
It also contains the font's design size; all following fix_word values are interpreted as multiplication factors for this. File structure of a TFM file. The next table, char_info, consists of one word per character, and contains indexes into the width, height, depth and italic correction tables. This is a device to save space, because width ...
This is an example font containing one glyph, for ASCII capital “A”. This glyph is taken from the GNU Unifont.. STARTFONT 2.1 FONT -gnu-unifont-medium-r-normal--16-160-75-75-c-80-iso10646-1 SIZE 16 75 75 FONTBOUNDINGBOX 16 16 0 -2 STARTPROPERTIES 2 FONT_ASCENT 14 FONT_DESCENT 2 ENDPROPERTIES CHARS 1 STARTCHAR U+0041 ENCODING 65 SWIDTH 500 0 DWIDTH 8 0 BBX 8 16 0 -2 BITMAP 00 00 00 00 18 24 ...
Complex text layout (CTL) or complex text rendering is the typesetting of writing systems in which the shape or positioning of a grapheme depends on its relation to other graphemes. The term is used in the field of software internationalization , where each grapheme is a character .
Whether modifying the font file with a font editor or overriding it in a particular system, the user is limited to the existing kerning features. Thus, if one needs features like optical kerning, or contextual kerning, or kerning a pair of characters that belong to different fonts, and if the system lacks these features, other means must be ...