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@ -4,7 +4,7 @@ |
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/* */ |
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/* TrueType Subpixel Hinting. */ |
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/* */ |
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/* Copyright 2010-2012 by */ |
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/* Copyright 2010-2013 by */ |
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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/* */ |
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/* This file is part of the FreeType project, and may only be used, */ |
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@ -28,6 +28,36 @@ |
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#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING |
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/*************************************************************************/ |
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/* */ |
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/* These rules affect how the TT Interpreter does hinting, with the */ |
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/* goal of doing subpixel hinting by (in general) ignoring x moves. */ |
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/* Some of these rules are fixes that go above and beyond the */ |
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/* stated techniques in the MS whitepaper on Cleartype, due to */ |
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/* artifacts in many glyphs. So, these rules make some glyphs render */ |
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/* better than they do in the MS rasterizer. */ |
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/* */ |
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/* "" string or 0 int/char indicates to apply to all glyphs. */ |
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/* "-" used as dummy placeholders, but any non-matching string works. */ |
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/* */ |
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/* Some of this could arguably be implemented in fontconfig, however: */ |
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/* */ |
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/* - Fontconfig can't set things on a glyph-by-glyph basis. */ |
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/* - The tweaks that happen here are very low-level, from an average */ |
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/* user's point of view and are best implemented in the hinter. */ |
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/* */ |
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/* The goal is to make the subpixel hinting techniques as generalized */ |
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/* as possible across all fonts to prevent the need for extra rules such */ |
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/* as these. */ |
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/* */ |
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/* The rule structure is designed so that entirely new rules can easily */ |
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/* be added when a new compatibility feature is discovered. */ |
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/* */ |
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/* The rule structures could also use some enhancement to handle ranges. */ |
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/* */ |
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/* ****************** WORK IN PROGRESS ******************* */ |
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/* */ |
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/* These are `classes' of fonts that can be grouped together and used in */ |
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/* rules below. A blank entry "" is required at the end of these! */ |
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#define FAMILY_CLASS_RULES_SIZE 7 |
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@ -181,13 +211,13 @@ |
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"Verdana", "", }, }, |
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}; |
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/* Define this to force natural (i.e. not bitmap-compatible) widths. */ |
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/* The default leans strongly towards natural widths except for a few */ |
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/* legacy fonts where a selective combination produces nicer results. */ |
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/* #define FORCE_NATURAL_WIDTHS */ |
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/* Define `classes' of styles that can be grouped together and used in */ |
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/* rules below. A blank entry "" is required at the end of these! */ |
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#define STYLE_CLASS_RULES_SIZE 5 |
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@ -803,8 +833,10 @@ |
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#endif /* FORCE_NATURAL_WIDTHS */ |
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FT_LOCAL_DEF( const SPH_ScaleRule* const ) |
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sph_X_SCALING_Rules = X_SCALING_Rules; |
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FT_LOCAL_DEF( const SPH_ScaleRule* const ) sph_X_SCALING_Rules |
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= X_SCALING_Rules; |
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FT_LOCAL_DEF( FT_Bool ) |
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is_member_of_family_class( const FT_String* detected_font_name, |
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Werner Lemberg
12 years ago