Index: include/freetype/ftautoh.h |
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+/***************************************************************************/ |
+/* */ |
+/* ftautoh.h */ |
+/* */ |
+/* FreeType API for controlling the auto-hinter (specification only). */ |
+/* */ |
+/* Copyright 2012 by */ |
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
+/* */ |
+/* This file is part of the FreeType project, and may only be used, */ |
+/* modified, and distributed under the terms of the FreeType project */ |
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
+/* this file you indicate that you have read the license and */ |
+/* understand and accept it fully. */ |
+/* */ |
+/***************************************************************************/ |
+ |
+ |
+#ifndef __FTAUTOH_H__ |
+#define __FTAUTOH_H__ |
+ |
+#include <ft2build.h> |
+#include FT_FREETYPE_H |
+ |
+#ifdef FREETYPE_H |
+#error "freetype.h of FreeType 1 has been loaded!" |
+#error "Please fix the directory search order for header files" |
+#error "so that freetype.h of FreeType 2 is found first." |
+#endif |
+ |
+ |
+FT_BEGIN_HEADER |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @section: |
+ * auto_hinter |
+ * |
+ * @title: |
+ * The auto-hinter |
+ * |
+ * @abstract: |
+ * Controlling the auto-hinting module. |
+ * |
+ * @description: |
+ * While FreeType's auto-hinter doesn't expose API functions by itself, |
+ * it is possible to control its behaviour with @FT_Property_Set and |
+ * @FT_Property_Get. The following lists the available properties |
+ * together with the necessary macros and structures. |
+ * |
+ * Note that the auto-hinter's module name is `autofitter' for |
+ * historical reasons. |
+ * |
+ */ |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @property: |
+ * glyph-to-script-map |
+ * |
+ * @description: |
+ * The auto-hinter provides various script modules to hint glyphs. |
+ * Examples of supported scripts are Latin or CJK. Before a glyph is |
+ * auto-hinted, the Unicode character map of the font gets examined, and |
+ * the script is then determined based on Unicode character ranges, see |
+ * below. |
+ * |
+ * OpenType fonts, however, often provide much more glyphs than |
+ * character codes (small caps, superscripts, ligatures, swashes, etc.), |
+ * to be controlled by so-called `features'. Handling OpenType features |
+ * can be quite complicated and thus needs a separate library on top of |
+ * FreeType. |
+ * |
+ * The mapping between glyph indices and scripts (in the auto-hinter |
+ * sense, see the @FT_AUTOHINTER_SCRIPT_XXX values) is stored as an |
+ * array with `num_glyphs' elements, as found in the font's @FT_Face |
+ * structure. The `glyph-to-script-map' property returns a pointer to |
+ * this array which can be modified as needed. Note that the |
+ * modification should happen before the first glyph gets processed by |
+ * the auto-hinter so that the global analysis of the font shapes |
+ * actually uses the modified mapping. |
+ * |
+ * The following example code demonstrates how to access it (omitting |
+ * the error handling). |
+ * |
+ * { |
+ * FT_Library library; |
+ * FT_Face face; |
+ * FT_Prop_GlyphToScriptMap prop; |
+ * |
+ * |
+ * FT_Init_FreeType( &library ); |
+ * FT_New_Face( library, "foo.ttf", 0, &face ); |
+ * |
+ * prop.face = face; |
+ * |
+ * FT_Property_Get( library, "autofitter", |
+ * "glyph-to-script-map", &prop ); |
+ * |
+ * // adjust `prop.map' as needed right here |
+ * |
+ * FT_Load_Glyph( face, ..., FT_LOAD_FORCE_AUTOHINT ); |
+ * } |
+ * |
+ */ |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @enum: |
+ * FT_AUTOHINTER_SCRIPT_XXX |
+ * |
+ * @description: |
+ * A list of constants used for the @glyph-to-script-map property to |
+ * specify the script submodule the auto-hinter should use for hinting a |
+ * particular glyph. |
+ * |
+ * @values: |
+ * FT_AUTOHINTER_SCRIPT_NONE :: |
+ * Don't auto-hint this glyph. |
+ * |
+ * FT_AUTOHINTER_SCRIPT_LATIN :: |
+ * Apply the latin auto-hinter. For the auto-hinter, `latin' is a |
+ * very broad term, including Cyrillic and Greek also since characters |
+ * from those scripts share the same design constraints. |
+ * |
+ * By default, characters from the following Unicode ranges are |
+ * assigned to this submodule. |
+ * |
+ * { |
+ * U+0020 - U+007F // Basic Latin (no control characters) |
+ * U+00A0 - U+00FF // Latin-1 Supplement (no control characters) |
+ * U+0100 - U+017F // Latin Extended-A |
+ * U+0180 - U+024F // Latin Extended-B |
+ * U+0250 - U+02AF // IPA Extensions |
+ * U+02B0 - U+02FF // Spacing Modifier Letters |
+ * U+0300 - U+036F // Combining Diacritical Marks |
+ * U+0370 - U+03FF // Greek and Coptic |
+ * U+0400 - U+04FF // Cyrillic |
+ * U+0500 - U+052F // Cyrillic Supplement |
+ * U+1D00 - U+1D7F // Phonetic Extensions |
+ * U+1D80 - U+1DBF // Phonetic Extensions Supplement |
+ * U+1DC0 - U+1DFF // Combining Diacritical Marks Supplement |
+ * U+1E00 - U+1EFF // Latin Extended Additional |
+ * U+1F00 - U+1FFF // Greek Extended |
+ * U+2000 - U+206F // General Punctuation |
+ * U+2070 - U+209F // Superscripts and Subscripts |
+ * U+20A0 - U+20CF // Currency Symbols |
+ * U+2150 - U+218F // Number Forms |
+ * U+2460 - U+24FF // Enclosed Alphanumerics |
+ * U+2C60 - U+2C7F // Latin Extended-C |
+ * U+2DE0 - U+2DFF // Cyrillic Extended-A |
+ * U+2E00 - U+2E7F // Supplemental Punctuation |
+ * U+A640 - U+A69F // Cyrillic Extended-B |
+ * U+A720 - U+A7FF // Latin Extended-D |
+ * U+FB00 - U+FB06 // Alphab. Present. Forms (Latin Ligatures) |
+ * U+1D400 - U+1D7FF // Mathematical Alphanumeric Symbols |
+ * U+1F100 - U+1F1FF // Enclosed Alphanumeric Supplement |
+ * } |
+ * |
+ * FT_AUTOHINTER_SCRIPT_CJK :: |
+ * Apply the CJK auto-hinter, covering Chinese, Japanese, Korean, old |
+ * Vietnamese, and some other scripts. |
+ * |
+ * By default, characters from the following Unicode ranges are |
+ * assigned to this submodule. |
+ * |
+ * { |
+ * U+1100 - U+11FF // Hangul Jamo |
+ * U+2E80 - U+2EFF // CJK Radicals Supplement |
+ * U+2F00 - U+2FDF // Kangxi Radicals |
+ * U+2FF0 - U+2FFF // Ideographic Description Characters |
+ * U+3000 - U+303F // CJK Symbols and Punctuation |
+ * U+3040 - U+309F // Hiragana |
+ * U+30A0 - U+30FF // Katakana |
+ * U+3100 - U+312F // Bopomofo |
+ * U+3130 - U+318F // Hangul Compatibility Jamo |
+ * U+3190 - U+319F // Kanbun |
+ * U+31A0 - U+31BF // Bopomofo Extended |
+ * U+31C0 - U+31EF // CJK Strokes |
+ * U+31F0 - U+31FF // Katakana Phonetic Extensions |
+ * U+3200 - U+32FF // Enclosed CJK Letters and Months |
+ * U+3300 - U+33FF // CJK Compatibility |
+ * U+3400 - U+4DBF // CJK Unified Ideographs Extension A |
+ * U+4DC0 - U+4DFF // Yijing Hexagram Symbols |
+ * U+4E00 - U+9FFF // CJK Unified Ideographs |
+ * U+A960 - U+A97F // Hangul Jamo Extended-A |
+ * U+AC00 - U+D7AF // Hangul Syllables |
+ * U+D7B0 - U+D7FF // Hangul Jamo Extended-B |
+ * U+F900 - U+FAFF // CJK Compatibility Ideographs |
+ * U+FE10 - U+FE1F // Vertical forms |
+ * U+FE30 - U+FE4F // CJK Compatibility Forms |
+ * U+FF00 - U+FFEF // Halfwidth and Fullwidth Forms |
+ * U+1B000 - U+1B0FF // Kana Supplement |
+ * U+1D300 - U+1D35F // Tai Xuan Hing Symbols |
+ * U+1F200 - U+1F2FF // Enclosed Ideographic Supplement |
+ * U+20000 - U+2A6DF // CJK Unified Ideographs Extension B |
+ * U+2A700 - U+2B73F // CJK Unified Ideographs Extension C |
+ * U+2B740 - U+2B81F // CJK Unified Ideographs Extension D |
+ * U+2F800 - U+2FA1F // CJK Compatibility Ideographs Supplement |
+ * } |
+ * |
+ * FT_AUTOHINTER_SCRIPT_INDIC :: |
+ * Apply the indic auto-hinter, covering all major scripts from the |
+ * Indian sub-continent and some other related scripts like Thai, Lao, |
+ * or Tibetan. |
+ * |
+ * By default, characters from the following Unicode ranges are |
+ * assigned to this submodule. |
+ * |
+ * { |
+ * U+0900 - U+0DFF // Indic Range |
+ * U+0F00 - U+0FFF // Tibetan |
+ * U+1900 - U+194F // Limbu |
+ * U+1B80 - U+1BBF // Sundanese |
+ * U+1C80 - U+1CDF // Meetei Mayak |
+ * U+A800 - U+A82F // Syloti Nagri |
+ * U+11800 - U+118DF // Sharada |
+ * } |
+ * |
+ * Note that currently Indic support is rudimentary only, missing blue |
+ * zone support. |
+ * |
+ */ |
+#define FT_AUTOHINTER_SCRIPT_NONE 0 |
+#define FT_AUTOHINTER_SCRIPT_LATIN 1 |
+#define FT_AUTOHINTER_SCRIPT_CJK 2 |
+#define FT_AUTOHINTER_SCRIPT_INDIC 3 |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @struct: |
+ * FT_Prop_GlyphToScriptMap |
+ * |
+ * @description: |
+ * The data exchange structure for the @glyph-to-script-map property. |
+ * |
+ */ |
+ typedef struct FT_Prop_GlyphToScriptMap_ |
+ { |
+ FT_Face face; |
+ FT_Byte* map; |
+ |
+ } FT_Prop_GlyphToScriptMap; |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @property: |
+ * fallback-script |
+ * |
+ * @description: |
+ * If no auto-hinter script module can be assigned to a glyph, a |
+ * fallback script gets assigned to it (see also the |
+ * @glyph-to-script-map property). By default, this is |
+ * @FT_AUTOHINTER_SCRIPT_CJK. Using the `fallback-script' property, |
+ * this fallback value can be changed. |
+ * |
+ * { |
+ * FT_Library library; |
+ * FT_UInt fallback_script = FT_AUTOHINTER_SCRIPT_NONE; |
+ * |
+ * |
+ * FT_Init_FreeType( &library ); |
+ * |
+ * FT_Property_Set( library, "autofitter", |
+ * "fallback-script", &fallback_script ); |
+ * } |
+ * |
+ * @note: |
+ * This property can be used with @FT_Property_Get also. |
+ * |
+ * It's important to use the right timing for changing this value: The |
+ * creation of the glyph-to-script map which eventually uses the |
+ * fallback script value gets triggered either by setting or reading a |
+ * face-specific property like @glyph-to-script-map, or by auto-hinting |
+ * any glyph from that face. In particular, if you have already created |
+ * an @FT_Face structure but not loaded any glyph (using the |
+ * auto-hinter), a change of the fallback glyph will affect this face. |
+ * |
+ */ |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @property: |
+ * increase-x-height |
+ * |
+ * @description: |
+ * For ppem values in the range 6~<= ppem <= `increase-x-height', round |
+ * up the font's x~height much more often than normally. If the value |
+ * is set to~0, which is the default, this feature is switched off. Use |
+ * this property to improve the legibility of small font sizes if |
+ * necessary. |
+ * |
+ * { |
+ * FT_Library library; |
+ * FT_Face face; |
+ * FT_Prop_IncreaseXHeight prop; |
+ * |
+ * |
+ * FT_Init_FreeType( &library ); |
+ * FT_New_Face( library, "foo.ttf", 0, &face ); |
+ * FT_Set_Char_Size( face, 10 * 64, 0, 72, 0 ); |
+ * |
+ * prop.face = face; |
+ * prop.limit = 14; |
+ * |
+ * FT_Property_Set( library, "autofitter", |
+ * "increase-x-height", &prop ); |
+ * } |
+ * |
+ * @note: |
+ * This property can be used with @FT_Property_Get also. |
+ * |
+ * Set this value right after calling @FT_Set_Char_Size, but before |
+ * loading any glyph (using the auto-hinter). |
+ * |
+ */ |
+ |
+ |
+ /************************************************************************** |
+ * |
+ * @struct: |
+ * FT_Prop_IncreaseXHeight |
+ * |
+ * @description: |
+ * The data exchange structure for the @increase-x-height property. |
+ * |
+ */ |
+ typedef struct FT_Prop_IncreaseXHeight_ |
+ { |
+ FT_Face face; |
+ FT_UInt limit; |
+ |
+ } FT_Prop_IncreaseXHeight; |
+ |
+ |
+ /* */ |
+ |
+FT_END_HEADER |
+ |
+#endif /* __FTAUTOH_H__ */ |
+ |
+ |
+/* END */ |