#WIN MYANMAR FONTS SYSTEMS APPROACH HOW TO#
#WIN MYANMAR FONTS SYSTEMS APPROACH CODE#
#WIN MYANMAR FONTS SYSTEMS APPROACH ISO#
#WIN MYANMAR FONTS SYSTEMS APPROACH WINDOWS#

For the range U+00A0.U+00FF, thereвЂ™s a charrep named вЂњhigh Latin 1вЂќ.Д®ast Asian (CJK-Chinese Japanese Korean) fonts all support ASCII, but typically donвЂ™t support high Latin 1, since at least some of those code positions are used for lead bytes of double-byte character sets or for kana characters.

#WIN MYANMAR FONTS SYSTEMS APPROACH WINDOWS#

The ANSI_CHARSET includes ASCII and the Western European ANSI set contained in Windows code page 1252. High ASCII, the range U+0040.U+007F is supported by most fonts as well. ASCII is treated specially, since almost all fonts support вЂњlow ASCIIвЂќ, the вЂњneutralвЂќ range U+0020.U+003F. RichEdit does a kind of binary range search to find out which charrep a character nominally belongs to. The IProvideFontInfo font binding described in the last section of this post attempts to do just that.

#WIN MYANMAR FONTS SYSTEMS APPROACH ISO#

Ideally there would be charreps for all ISO scripts that Windows supports. The charreps can be used for font binding and they are also used to improve performance by avoiding unnecessary text analysis. Most of these are described in The Unicode Standard. In addition to the charrep for each Windows charset, there are charreps for Armenian It usually corresponds to an ISO script, but there are charreps with no corresponding ISO script and vice versa. Accordingly, we defined the charrep, a character repertoire index.

RichEdit needed to generalize this usage of charset. Unfortunately, that decision limited GDIвЂ™s convenient font вЂњfallbackвЂќ mechanism to character repertoires that have charsets. When Windows 2000 added support for Indic and several other Southeast Asian scripts, the decision was made not to add charsets for new scripts since it was clear that Unicode was the best way to represent characters on computers. For reference, the Windows charsets supported by RichEdit are ANSI_CHARSET The Windows code pages are described here.

In contrast itвЂ™s harder to choose the correct languages for characters in general.Д¬harsets correspond to code pages. This facility, which is a kind of вЂњfont fallbackвЂќ, is very handy, since itвЂ™s usually easy to choose the charsets for characters that have charsets. The GDI CreateFont charset functionality addresses the latter purpose. As such they were used for two purposes: 1) to define the encodings, and 2) to define character repertoires supported by fonts. Before Unicode became popular, charsets defined character encodings for character repertoires typically associated with language systems, like Western European languages and Japanese. If the font named in the call supports the charset, then the font is used, but if not, GDI instantiates a font that does. RichEditвЂ™s built-in font binding facility is an extension of the GDI CreateFont() functionality that ensures the created font matches a given charset. The fifth section describes the alternative font binding technology (IProvideFontInfo) used by the XAML RichEditBox and TextBox controls as well as Office applications that run RichEdit in the D2D/DirectWrite mode. The fourth section shows how these two kinds of information can be combined to bind fonts to characters in a context-dependent way.

#WIN MYANMAR FONTS SYSTEMS APPROACH HOW TO#

The third section describes how to find out what character repertoires are supported by a font.

The second section explains how a character is assigned to a character repertoire. The first section describes RichEdit character repertoires. This post describes the two ways RichEdit chooses fonts for characters not present in the active font. East Asian characters, for example, ideally have different baselines from Latin characters. Furthermore, even if a font could contain glyphs for all Unicode characters, it wouldnвЂ™t be able to render them all without compromises in quality. Meanwhile Unicode has over 140,000 named characters. In general, the same font cannot be used for all characters, since TrueType glyph indices are 16-bit numbers thereby limiting fonts to 65536 glyphs. The question arises as to what font(s) to use for the pasted characters. That includes virtually all characters used in the current languages of the world along with many ancient scripts and a plethora of symbols, mathematical and otherwise, that donвЂ™t belong to any language. In principle, the text can contain any Unicode character. Suppose a user pastes some plain text into a document.

Win myanmar fonts systems approach