| /**************************************************************************** |
| * |
| * ttsubpix.c |
| * |
| * TrueType Subpixel Hinting. |
| * |
| * Copyright (C) 2010-2021 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. |
| * |
| */ |
| |
| #include <freetype/internal/ftdebug.h> |
| #include <freetype/internal/ftcalc.h> |
| #include <freetype/internal/ftstream.h> |
| #include <freetype/internal/sfnt.h> |
| #include <freetype/tttags.h> |
| #include <freetype/ftoutln.h> |
| #include <freetype/ftdriver.h> |
| |
| #include "ttsubpix.h" |
| |
| |
| #if defined( TT_USE_BYTECODE_INTERPRETER ) && \ |
| defined( TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY ) |
| |
| /************************************************************************** |
| * |
| * These rules affect how the TT Interpreter does hinting, with the |
| * goal of doing subpixel hinting by (in general) ignoring x moves. |
| * Some of these rules are fixes that go above and beyond the |
| * stated techniques in the MS whitepaper on Cleartype, due to |
| * artifacts in many glyphs. So, these rules make some glyphs render |
| * better than they do in the MS rasterizer. |
| * |
| * "" string or 0 int/char indicates to apply to all glyphs. |
| * "-" used as dummy placeholders, but any non-matching string works. |
| * |
| * Some of this could arguably be implemented in fontconfig, however: |
| * |
| * - Fontconfig can't set things on a glyph-by-glyph basis. |
| * - The tweaks that happen here are very low-level, from an average |
| * user's point of view and are best implemented in the hinter. |
| * |
| * The goal is to make the subpixel hinting techniques as generalized |
| * as possible across all fonts to prevent the need for extra rules such |
| * as these. |
| * |
| * The rule structure is designed so that entirely new rules can easily |
| * be added when a new compatibility feature is discovered. |
| * |
| * The rule structures could also use some enhancement to handle ranges. |
| * |
| * ****************** WORK IN PROGRESS ******************* |
| */ |
| |
| /* These are `classes' of fonts that can be grouped together and used in */ |
| /* rules below. A blank entry "" is required at the end of these! */ |
| #define FAMILY_CLASS_RULES_SIZE 7 |
| |
| static const SPH_Font_Class FAMILY_CLASS_Rules |
| [FAMILY_CLASS_RULES_SIZE] = |
| { |
| { "MS Legacy Fonts", |
| { "Aharoni", |
| "Andale Mono", |
| "Andalus", |
| "Angsana New", |
| "AngsanaUPC", |
| "Arabic Transparent", |
| "Arial Black", |
| "Arial Narrow", |
| "Arial Unicode MS", |
| "Arial", |
| "Batang", |
| "Browallia New", |
| "BrowalliaUPC", |
| "Comic Sans MS", |
| "Cordia New", |
| "CordiaUPC", |
| "Courier New", |
| "DFKai-SB", |
| "David Transparent", |
| "David", |
| "DilleniaUPC", |
| "Estrangelo Edessa", |
| "EucrosiaUPC", |
| "FangSong_GB2312", |
| "Fixed Miriam Transparent", |
| "FrankRuehl", |
| "Franklin Gothic Medium", |
| "FreesiaUPC", |
| "Garamond", |
| "Gautami", |
| "Georgia", |
| "Gulim", |
| "Impact", |
| "IrisUPC", |
| "JasmineUPC", |
| "KaiTi_GB2312", |
| "KodchiangUPC", |
| "Latha", |
| "Levenim MT", |
| "LilyUPC", |
| "Lucida Console", |
| "Lucida Sans Unicode", |
| "MS Gothic", |
| "MS Mincho", |
| "MV Boli", |
| "Mangal", |
| "Marlett", |
| "Microsoft Sans Serif", |
| "Mingliu", |
| "Miriam Fixed", |
| "Miriam Transparent", |
| "Miriam", |
| "Narkisim", |
| "Palatino Linotype", |
| "Raavi", |
| "Rod Transparent", |
| "Rod", |
| "Shruti", |
| "SimHei", |
| "Simplified Arabic Fixed", |
| "Simplified Arabic", |
| "Simsun", |
| "Sylfaen", |
| "Symbol", |
| "Tahoma", |
| "Times New Roman", |
| "Traditional Arabic", |
| "Trebuchet MS", |
| "Tunga", |
| "Verdana", |
| "Webdings", |
| "Wingdings", |
| "", |
| }, |
| }, |
| { "Core MS Legacy Fonts", |
| { "Arial Black", |
| "Arial Narrow", |
| "Arial Unicode MS", |
| "Arial", |
| "Comic Sans MS", |
| "Courier New", |
| "Garamond", |
| "Georgia", |
| "Impact", |
| "Lucida Console", |
| "Lucida Sans Unicode", |
| "Microsoft Sans Serif", |
| "Palatino Linotype", |
| "Tahoma", |
| "Times New Roman", |
| "Trebuchet MS", |
| "Verdana", |
| "", |
| }, |
| }, |
| { "Apple Legacy Fonts", |
| { "Geneva", |
| "Times", |
| "Monaco", |
| "Century", |
| "Chalkboard", |
| "Lobster", |
| "Century Gothic", |
| "Optima", |
| "Lucida Grande", |
| "Gill Sans", |
| "Baskerville", |
| "Helvetica", |
| "Helvetica Neue", |
| "", |
| }, |
| }, |
| { "Legacy Sans Fonts", |
| { "Andale Mono", |
| "Arial Unicode MS", |
| "Arial", |
| "Century Gothic", |
| "Comic Sans MS", |
| "Franklin Gothic Medium", |
| "Geneva", |
| "Lucida Console", |
| "Lucida Grande", |
| "Lucida Sans Unicode", |
| "Lucida Sans Typewriter", |
| "Microsoft Sans Serif", |
| "Monaco", |
| "Tahoma", |
| "Trebuchet MS", |
| "Verdana", |
| "", |
| }, |
| }, |
| |
| { "Misc Legacy Fonts", |
| { "Dark Courier", "", }, }, |
| { "Verdana Clones", |
| { "DejaVu Sans", |
| "Bitstream Vera Sans", "", }, }, |
| { "Verdana and Clones", |
| { "DejaVu Sans", |
| "Bitstream Vera Sans", |
| "Verdana", "", }, }, |
| }; |
| |
| |
| /* Define this to force natural (i.e. not bitmap-compatible) widths. */ |
| /* The default leans strongly towards natural widths except for a few */ |
| /* legacy fonts where a selective combination produces nicer results. */ |
| /* #define FORCE_NATURAL_WIDTHS */ |
| |
| |
| /* Define `classes' of styles that can be grouped together and used in */ |
| /* rules below. A blank entry "" is required at the end of these! */ |
| #define STYLE_CLASS_RULES_SIZE 5 |
| |
| static const SPH_Font_Class STYLE_CLASS_Rules |
| [STYLE_CLASS_RULES_SIZE] = |
| { |
| { "Regular Class", |
| { "Regular", |
| "Book", |
| "Medium", |
| "Roman", |
| "Normal", |
| "", |
| }, |
| }, |
| { "Regular/Italic Class", |
| { "Regular", |
| "Book", |
| "Medium", |
| "Italic", |
| "Oblique", |
| "Roman", |
| "Normal", |
| "", |
| }, |
| }, |
| { "Bold/BoldItalic Class", |
| { "Bold", |
| "Bold Italic", |
| "Black", |
| "", |
| }, |
| }, |
| { "Bold/Italic/BoldItalic Class", |
| { "Bold", |
| "Bold Italic", |
| "Black", |
| "Italic", |
| "Oblique", |
| "", |
| }, |
| }, |
| { "Regular/Bold Class", |
| { "Regular", |
| "Book", |
| "Medium", |
| "Normal", |
| "Roman", |
| "Bold", |
| "Black", |
| "", |
| }, |
| }, |
| }; |
| |
| |
| /* Force special legacy fixes for fonts. */ |
| #define COMPATIBILITY_MODE_RULES_SIZE 1 |
| |
| static const SPH_TweakRule COMPATIBILITY_MODE_Rules |
| [COMPATIBILITY_MODE_RULES_SIZE] = |
| { |
| { "Verdana Clones", 0, "", 0 }, |
| }; |
| |
| |
| /* Don't do subpixel (ignore_x_mode) hinting; do normal hinting. */ |
| #define PIXEL_HINTING_RULES_SIZE 2 |
| |
| static const SPH_TweakRule PIXEL_HINTING_Rules |
| [PIXEL_HINTING_RULES_SIZE] = |
| { |
| /* these characters are almost always safe */ |
| { "Courier New", 12, "Italic", 'z' }, |
| { "Courier New", 11, "Italic", 'z' }, |
| }; |
| |
| |
| /* Subpixel hinting ignores SHPIX rules on X. Force SHPIX for these. */ |
| #define DO_SHPIX_RULES_SIZE 1 |
| |
| static const SPH_TweakRule DO_SHPIX_Rules |
| [DO_SHPIX_RULES_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* Skip Y moves that start with a point that is not on a Y pixel */ |
| /* boundary and don't move that point to a Y pixel boundary. */ |
| #define SKIP_NONPIXEL_Y_MOVES_RULES_SIZE 4 |
| |
| static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules |
| [SKIP_NONPIXEL_Y_MOVES_RULES_SIZE] = |
| { |
| /* fix vwxyz thinness*/ |
| { "Consolas", 0, "", 0 }, |
| /* Fix thin middle stems */ |
| { "Core MS Legacy Fonts", 0, "Regular", 0 }, |
| /* Cyrillic small letter I */ |
| { "Legacy Sans Fonts", 0, "", 0 }, |
| /* Fix artifacts with some Regular & Bold */ |
| { "Verdana Clones", 0, "", 0 }, |
| }; |
| |
| |
| #define SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 |
| |
| static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules_Exceptions |
| [SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = |
| { |
| /* Fixes < and > */ |
| { "Courier New", 0, "Regular", 0 }, |
| }; |
| |
| |
| /* Skip Y moves that start with a point that is not on a Y pixel */ |
| /* boundary and don't move that point to a Y pixel boundary. */ |
| #define SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE 2 |
| |
| static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_DELTAP_Rules |
| [SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE] = |
| { |
| /* Maintain thickness of diagonal in 'N' */ |
| { "Times New Roman", 0, "Regular/Bold Class", 'N' }, |
| { "Georgia", 0, "Regular/Bold Class", 'N' }, |
| }; |
| |
| |
| /* Skip Y moves that move a point off a Y pixel boundary. */ |
| #define SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE 1 |
| |
| static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules |
| [SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| #define SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 |
| |
| static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules_Exceptions |
| [SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* Round moves that don't move a point to a Y pixel boundary. */ |
| #define ROUND_NONPIXEL_Y_MOVES_RULES_SIZE 2 |
| |
| static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules |
| [ROUND_NONPIXEL_Y_MOVES_RULES_SIZE] = |
| { |
| /* Droid font instructions don't snap Y to pixels */ |
| { "Droid Sans", 0, "Regular/Italic Class", 0 }, |
| { "Droid Sans Mono", 0, "", 0 }, |
| }; |
| |
| |
| #define ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 |
| |
| static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules_Exceptions |
| [ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* Allow a Direct_Move along X freedom vector if matched. */ |
| #define ALLOW_X_DMOVE_RULES_SIZE 1 |
| |
| static const SPH_TweakRule ALLOW_X_DMOVE_Rules |
| [ALLOW_X_DMOVE_RULES_SIZE] = |
| { |
| /* Fixes vanishing diagonal in 4 */ |
| { "Verdana", 0, "Regular", '4' }, |
| }; |
| |
| |
| /* Return MS rasterizer version 35 if matched. */ |
| #define RASTERIZER_35_RULES_SIZE 8 |
| |
| static const SPH_TweakRule RASTERIZER_35_Rules |
| [RASTERIZER_35_RULES_SIZE] = |
| { |
| /* This seems to be the only way to make these look good */ |
| { "Times New Roman", 0, "Regular", 'i' }, |
| { "Times New Roman", 0, "Regular", 'j' }, |
| { "Times New Roman", 0, "Regular", 'm' }, |
| { "Times New Roman", 0, "Regular", 'r' }, |
| { "Times New Roman", 0, "Regular", 'a' }, |
| { "Times New Roman", 0, "Regular", 'n' }, |
| { "Times New Roman", 0, "Regular", 'p' }, |
| { "Times", 0, "", 0 }, |
| }; |
| |
| |
| /* Don't round to the subpixel grid. Round to pixel grid. */ |
| #define NORMAL_ROUND_RULES_SIZE 1 |
| |
| static const SPH_TweakRule NORMAL_ROUND_Rules |
| [NORMAL_ROUND_RULES_SIZE] = |
| { |
| /* Fix serif thickness for certain ppems */ |
| /* Can probably be generalized somehow */ |
| { "Courier New", 0, "", 0 }, |
| }; |
| |
| |
| /* Skip IUP instructions if matched. */ |
| #define SKIP_IUP_RULES_SIZE 1 |
| |
| static const SPH_TweakRule SKIP_IUP_Rules |
| [SKIP_IUP_RULES_SIZE] = |
| { |
| { "Arial", 13, "Regular", 'a' }, |
| }; |
| |
| |
| /* Skip MIAP Twilight hack if matched. */ |
| #define MIAP_HACK_RULES_SIZE 1 |
| |
| static const SPH_TweakRule MIAP_HACK_Rules |
| [MIAP_HACK_RULES_SIZE] = |
| { |
| { "Geneva", 12, "", 0 }, |
| }; |
| |
| |
| /* Skip DELTAP instructions if matched. */ |
| #define ALWAYS_SKIP_DELTAP_RULES_SIZE 23 |
| |
| static const SPH_TweakRule ALWAYS_SKIP_DELTAP_Rules |
| [ALWAYS_SKIP_DELTAP_RULES_SIZE] = |
| { |
| { "Georgia", 0, "Regular", 'k' }, |
| /* fix various problems with e in different versions */ |
| { "Trebuchet MS", 14, "Regular", 'e' }, |
| { "Trebuchet MS", 13, "Regular", 'e' }, |
| { "Trebuchet MS", 15, "Regular", 'e' }, |
| { "Trebuchet MS", 0, "Italic", 'v' }, |
| { "Trebuchet MS", 0, "Italic", 'w' }, |
| { "Trebuchet MS", 0, "Regular", 'Y' }, |
| { "Arial", 11, "Regular", 's' }, |
| /* prevent problems with '3' and others */ |
| { "Verdana", 10, "Regular", 0 }, |
| { "Verdana", 9, "Regular", 0 }, |
| /* Cyrillic small letter short I */ |
| { "Legacy Sans Fonts", 0, "", 0x438 }, |
| { "Legacy Sans Fonts", 0, "", 0x439 }, |
| { "Arial", 10, "Regular", '6' }, |
| { "Arial", 0, "Bold/BoldItalic Class", 'a' }, |
| /* Make horizontal stems consistent with the rest */ |
| { "Arial", 24, "Bold", 'a' }, |
| { "Arial", 25, "Bold", 'a' }, |
| { "Arial", 24, "Bold", 's' }, |
| { "Arial", 25, "Bold", 's' }, |
| { "Arial", 34, "Bold", 's' }, |
| { "Arial", 35, "Bold", 's' }, |
| { "Arial", 36, "Bold", 's' }, |
| { "Arial", 25, "Regular", 's' }, |
| { "Arial", 26, "Regular", 's' }, |
| }; |
| |
| |
| /* Always do DELTAP instructions if matched. */ |
| #define ALWAYS_DO_DELTAP_RULES_SIZE 1 |
| |
| static const SPH_TweakRule ALWAYS_DO_DELTAP_Rules |
| [ALWAYS_DO_DELTAP_RULES_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* Don't allow ALIGNRP after IUP. */ |
| #define NO_ALIGNRP_AFTER_IUP_RULES_SIZE 1 |
| |
| static const SPH_TweakRule NO_ALIGNRP_AFTER_IUP_Rules |
| [NO_ALIGNRP_AFTER_IUP_RULES_SIZE] = |
| { |
| /* Prevent creation of dents in outline */ |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* Don't allow DELTAP after IUP. */ |
| #define NO_DELTAP_AFTER_IUP_RULES_SIZE 1 |
| |
| static const SPH_TweakRule NO_DELTAP_AFTER_IUP_Rules |
| [NO_DELTAP_AFTER_IUP_RULES_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* Don't allow CALL after IUP. */ |
| #define NO_CALL_AFTER_IUP_RULES_SIZE 1 |
| |
| static const SPH_TweakRule NO_CALL_AFTER_IUP_Rules |
| [NO_CALL_AFTER_IUP_RULES_SIZE] = |
| { |
| /* Prevent creation of dents in outline */ |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| /* De-embolden these glyphs slightly. */ |
| #define DEEMBOLDEN_RULES_SIZE 9 |
| |
| static const SPH_TweakRule DEEMBOLDEN_Rules |
| [DEEMBOLDEN_RULES_SIZE] = |
| { |
| { "Courier New", 0, "Bold", 'A' }, |
| { "Courier New", 0, "Bold", 'W' }, |
| { "Courier New", 0, "Bold", 'w' }, |
| { "Courier New", 0, "Bold", 'M' }, |
| { "Courier New", 0, "Bold", 'X' }, |
| { "Courier New", 0, "Bold", 'K' }, |
| { "Courier New", 0, "Bold", 'x' }, |
| { "Courier New", 0, "Bold", 'z' }, |
| { "Courier New", 0, "Bold", 'v' }, |
| }; |
| |
| |
| /* Embolden these glyphs slightly. */ |
| #define EMBOLDEN_RULES_SIZE 2 |
| |
| static const SPH_TweakRule EMBOLDEN_Rules |
| [EMBOLDEN_RULES_SIZE] = |
| { |
| { "Courier New", 0, "Regular", 0 }, |
| { "Courier New", 0, "Italic", 0 }, |
| }; |
| |
| |
| /* This is a CVT hack that makes thick horizontal stems on 2, 5, 7 */ |
| /* similar to Windows XP. */ |
| #define TIMES_NEW_ROMAN_HACK_RULES_SIZE 12 |
| |
| static const SPH_TweakRule TIMES_NEW_ROMAN_HACK_Rules |
| [TIMES_NEW_ROMAN_HACK_RULES_SIZE] = |
| { |
| { "Times New Roman", 16, "Italic", '2' }, |
| { "Times New Roman", 16, "Italic", '5' }, |
| { "Times New Roman", 16, "Italic", '7' }, |
| { "Times New Roman", 16, "Regular", '2' }, |
| { "Times New Roman", 16, "Regular", '5' }, |
| { "Times New Roman", 16, "Regular", '7' }, |
| { "Times New Roman", 17, "Italic", '2' }, |
| { "Times New Roman", 17, "Italic", '5' }, |
| { "Times New Roman", 17, "Italic", '7' }, |
| { "Times New Roman", 17, "Regular", '2' }, |
| { "Times New Roman", 17, "Regular", '5' }, |
| { "Times New Roman", 17, "Regular", '7' }, |
| }; |
| |
| |
| /* This fudges distance on 2 to get rid of the vanishing stem issue. */ |
| /* A real solution to this is certainly welcome. */ |
| #define COURIER_NEW_2_HACK_RULES_SIZE 15 |
| |
| static const SPH_TweakRule COURIER_NEW_2_HACK_Rules |
| [COURIER_NEW_2_HACK_RULES_SIZE] = |
| { |
| { "Courier New", 10, "Regular", '2' }, |
| { "Courier New", 11, "Regular", '2' }, |
| { "Courier New", 12, "Regular", '2' }, |
| { "Courier New", 13, "Regular", '2' }, |
| { "Courier New", 14, "Regular", '2' }, |
| { "Courier New", 15, "Regular", '2' }, |
| { "Courier New", 16, "Regular", '2' }, |
| { "Courier New", 17, "Regular", '2' }, |
| { "Courier New", 18, "Regular", '2' }, |
| { "Courier New", 19, "Regular", '2' }, |
| { "Courier New", 20, "Regular", '2' }, |
| { "Courier New", 21, "Regular", '2' }, |
| { "Courier New", 22, "Regular", '2' }, |
| { "Courier New", 23, "Regular", '2' }, |
| { "Courier New", 24, "Regular", '2' }, |
| }; |
| |
| |
| #ifndef FORCE_NATURAL_WIDTHS |
| |
| /* Use compatible widths with these glyphs. Compatible widths is always */ |
| /* on when doing B/W TrueType instructing, but is used selectively here, */ |
| /* typically on glyphs with 3 or more vertical stems. */ |
| #define COMPATIBLE_WIDTHS_RULES_SIZE 38 |
| |
| static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules |
| [COMPATIBLE_WIDTHS_RULES_SIZE] = |
| { |
| { "Arial Unicode MS", 12, "Regular Class", 'm' }, |
| { "Arial Unicode MS", 14, "Regular Class", 'm' }, |
| /* Cyrillic small letter sha */ |
| { "Arial", 10, "Regular Class", 0x448 }, |
| { "Arial", 11, "Regular Class", 'm' }, |
| { "Arial", 12, "Regular Class", 'm' }, |
| /* Cyrillic small letter sha */ |
| { "Arial", 12, "Regular Class", 0x448 }, |
| { "Arial", 13, "Regular Class", 0x448 }, |
| { "Arial", 14, "Regular Class", 'm' }, |
| /* Cyrillic small letter sha */ |
| { "Arial", 14, "Regular Class", 0x448 }, |
| { "Arial", 15, "Regular Class", 0x448 }, |
| { "Arial", 17, "Regular Class", 'm' }, |
| { "DejaVu Sans", 15, "Regular Class", 0 }, |
| { "Microsoft Sans Serif", 11, "Regular Class", 0 }, |
| { "Microsoft Sans Serif", 12, "Regular Class", 0 }, |
| { "Segoe UI", 11, "Regular Class", 0 }, |
| { "Monaco", 0, "Regular Class", 0 }, |
| { "Segoe UI", 12, "Regular Class", 'm' }, |
| { "Segoe UI", 14, "Regular Class", 'm' }, |
| { "Tahoma", 11, "Regular Class", 0 }, |
| { "Times New Roman", 16, "Regular Class", 'c' }, |
| { "Times New Roman", 16, "Regular Class", 'm' }, |
| { "Times New Roman", 16, "Regular Class", 'o' }, |
| { "Times New Roman", 16, "Regular Class", 'w' }, |
| { "Trebuchet MS", 11, "Regular Class", 0 }, |
| { "Trebuchet MS", 12, "Regular Class", 0 }, |
| { "Trebuchet MS", 14, "Regular Class", 0 }, |
| { "Trebuchet MS", 15, "Regular Class", 0 }, |
| { "Ubuntu", 12, "Regular Class", 'm' }, |
| /* Cyrillic small letter sha */ |
| { "Verdana", 10, "Regular Class", 0x448 }, |
| { "Verdana", 11, "Regular Class", 0x448 }, |
| { "Verdana and Clones", 12, "Regular Class", 'i' }, |
| { "Verdana and Clones", 12, "Regular Class", 'j' }, |
| { "Verdana and Clones", 12, "Regular Class", 'l' }, |
| { "Verdana and Clones", 12, "Regular Class", 'm' }, |
| { "Verdana and Clones", 13, "Regular Class", 'i' }, |
| { "Verdana and Clones", 13, "Regular Class", 'j' }, |
| { "Verdana and Clones", 13, "Regular Class", 'l' }, |
| { "Verdana and Clones", 14, "Regular Class", 'm' }, |
| }; |
| |
| |
| /* Scaling slightly in the x-direction prior to hinting results in */ |
| /* more visually pleasing glyphs in certain cases. */ |
| /* This sometimes needs to be coordinated with compatible width rules. */ |
| /* A value of 1000 corresponds to a scaled value of 1.0. */ |
| |
| #define X_SCALING_RULES_SIZE 50 |
| |
| static const SPH_ScaleRule X_SCALING_Rules[X_SCALING_RULES_SIZE] = |
| { |
| { "DejaVu Sans", 12, "Regular Class", 'm', 950 }, |
| { "Verdana and Clones", 12, "Regular Class", 'a', 1100 }, |
| { "Verdana and Clones", 13, "Regular Class", 'a', 1050 }, |
| { "Arial", 11, "Regular Class", 'm', 975 }, |
| { "Arial", 12, "Regular Class", 'm', 1050 }, |
| /* Cyrillic small letter el */ |
| { "Arial", 13, "Regular Class", 0x43B, 950 }, |
| { "Arial", 13, "Regular Class", 'o', 950 }, |
| { "Arial", 13, "Regular Class", 'e', 950 }, |
| { "Arial", 14, "Regular Class", 'm', 950 }, |
| /* Cyrillic small letter el */ |
| { "Arial", 15, "Regular Class", 0x43B, 925 }, |
| { "Bitstream Vera Sans", 10, "Regular/Italic Class", 0, 1100 }, |
| { "Bitstream Vera Sans", 12, "Regular/Italic Class", 0, 1050 }, |
| { "Bitstream Vera Sans", 16, "Regular Class", 0, 1050 }, |
| { "Bitstream Vera Sans", 9, "Regular/Italic Class", 0, 1050 }, |
| { "DejaVu Sans", 12, "Regular Class", 'l', 975 }, |
| { "DejaVu Sans", 12, "Regular Class", 'i', 975 }, |
| { "DejaVu Sans", 12, "Regular Class", 'j', 975 }, |
| { "DejaVu Sans", 13, "Regular Class", 'l', 950 }, |
| { "DejaVu Sans", 13, "Regular Class", 'i', 950 }, |
| { "DejaVu Sans", 13, "Regular Class", 'j', 950 }, |
| { "DejaVu Sans", 10, "Regular/Italic Class", 0, 1100 }, |
| { "DejaVu Sans", 12, "Regular/Italic Class", 0, 1050 }, |
| { "Georgia", 10, "", 0, 1050 }, |
| { "Georgia", 11, "", 0, 1100 }, |
| { "Georgia", 12, "", 0, 1025 }, |
| { "Georgia", 13, "", 0, 1050 }, |
| { "Georgia", 16, "", 0, 1050 }, |
| { "Georgia", 17, "", 0, 1030 }, |
| { "Liberation Sans", 12, "Regular Class", 'm', 1100 }, |
| { "Lucida Grande", 11, "Regular Class", 'm', 1100 }, |
| { "Microsoft Sans Serif", 11, "Regular Class", 'm', 950 }, |
| { "Microsoft Sans Serif", 12, "Regular Class", 'm', 1050 }, |
| { "Segoe UI", 12, "Regular Class", 'H', 1050 }, |
| { "Segoe UI", 12, "Regular Class", 'm', 1050 }, |
| { "Segoe UI", 14, "Regular Class", 'm', 1050 }, |
| { "Tahoma", 11, "Regular Class", 'i', 975 }, |
| { "Tahoma", 11, "Regular Class", 'l', 975 }, |
| { "Tahoma", 11, "Regular Class", 'j', 900 }, |
| { "Tahoma", 11, "Regular Class", 'm', 918 }, |
| { "Verdana", 10, "Regular/Italic Class", 0, 1100 }, |
| { "Verdana", 12, "Regular Class", 'm', 975 }, |
| { "Verdana", 12, "Regular/Italic Class", 0, 1050 }, |
| { "Verdana", 13, "Regular/Italic Class", 'i', 950 }, |
| { "Verdana", 13, "Regular/Italic Class", 'j', 950 }, |
| { "Verdana", 13, "Regular/Italic Class", 'l', 950 }, |
| { "Verdana", 16, "Regular Class", 0, 1050 }, |
| { "Verdana", 9, "Regular/Italic Class", 0, 1050 }, |
| { "Times New Roman", 16, "Regular Class", 'm', 918 }, |
| { "Trebuchet MS", 11, "Regular Class", 'm', 800 }, |
| { "Trebuchet MS", 12, "Regular Class", 'm', 800 }, |
| }; |
| |
| #else |
| |
| #define COMPATIBLE_WIDTHS_RULES_SIZE 1 |
| |
| static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules |
| [COMPATIBLE_WIDTHS_RULES_SIZE] = |
| { |
| { "-", 0, "", 0 }, |
| }; |
| |
| |
| #define X_SCALING_RULES_SIZE 1 |
| |
| static const SPH_ScaleRule X_SCALING_Rules |
| [X_SCALING_RULES_SIZE] = |
| { |
| { "-", 0, "", 0, 1000 }, |
| }; |
| |
| #endif /* FORCE_NATURAL_WIDTHS */ |
| |
| |
| static FT_Bool |
| is_member_of_family_class( const FT_String* detected_font_name, |
| const FT_String* rule_font_name ) |
| { |
| FT_UInt i, j; |
| |
| |
| /* Does font name match rule family? */ |
| if ( ft_strcmp( detected_font_name, rule_font_name ) == 0 ) |
| return TRUE; |
| |
| /* Is font name a wildcard ""? */ |
| if ( ft_strcmp( rule_font_name, "" ) == 0 ) |
| return TRUE; |
| |
| /* Is font name contained in a class list? */ |
| for ( i = 0; i < FAMILY_CLASS_RULES_SIZE; i++ ) |
| { |
| if ( ft_strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 ) |
| { |
| for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ ) |
| { |
| if ( ft_strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 ) |
| continue; |
| if ( ft_strcmp( FAMILY_CLASS_Rules[i].member[j], |
| detected_font_name ) == 0 ) |
| return TRUE; |
| } |
| } |
| } |
| |
| return FALSE; |
| } |
| |
| |
| static FT_Bool |
| is_member_of_style_class( const FT_String* detected_font_style, |
| const FT_String* rule_font_style ) |
| { |
| FT_UInt i, j; |
| |
| |
| /* Does font style match rule style? */ |
| if ( ft_strcmp( detected_font_style, rule_font_style ) == 0 ) |
| return TRUE; |
| |
| /* Is font style a wildcard ""? */ |
| if ( ft_strcmp( rule_font_style, "" ) == 0 ) |
| return TRUE; |
| |
| /* Is font style contained in a class list? */ |
| for ( i = 0; i < STYLE_CLASS_RULES_SIZE; i++ ) |
| { |
| if ( ft_strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 ) |
| { |
| for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ ) |
| { |
| if ( ft_strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 ) |
| continue; |
| if ( ft_strcmp( STYLE_CLASS_Rules[i].member[j], |
| detected_font_style ) == 0 ) |
| return TRUE; |
| } |
| } |
| } |
| |
| return FALSE; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Bool ) |
| sph_test_tweak( TT_Face face, |
| const FT_String* family, |
| FT_UInt ppem, |
| const FT_String* style, |
| FT_UInt glyph_index, |
| const SPH_TweakRule* rule, |
| FT_UInt num_rules ) |
| { |
| FT_UInt i; |
| |
| |
| /* rule checks may be able to be optimized further */ |
| for ( i = 0; i < num_rules; i++ ) |
| { |
| if ( family && |
| ( is_member_of_family_class ( family, rule[i].family ) ) ) |
| if ( rule[i].ppem == 0 || |
| rule[i].ppem == ppem ) |
| if ( style && |
| is_member_of_style_class ( style, rule[i].style ) ) |
| if ( rule[i].glyph == 0 || |
| FT_Get_Char_Index( (FT_Face)face, |
| rule[i].glyph ) == glyph_index ) |
| return TRUE; |
| } |
| |
| return FALSE; |
| } |
| |
| |
| static FT_UInt |
| scale_test_tweak( TT_Face face, |
| const FT_String* family, |
| FT_UInt ppem, |
| const FT_String* style, |
| FT_UInt glyph_index, |
| const SPH_ScaleRule* rule, |
| FT_UInt num_rules ) |
| { |
| FT_UInt i; |
| |
| |
| /* rule checks may be able to be optimized further */ |
| for ( i = 0; i < num_rules; i++ ) |
| { |
| if ( family && |
| ( is_member_of_family_class ( family, rule[i].family ) ) ) |
| if ( rule[i].ppem == 0 || |
| rule[i].ppem == ppem ) |
| if ( style && |
| is_member_of_style_class( style, rule[i].style ) ) |
| if ( rule[i].glyph == 0 || |
| FT_Get_Char_Index( (FT_Face)face, |
| rule[i].glyph ) == glyph_index ) |
| return rule[i].scale; |
| } |
| |
| return 1000; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_UInt ) |
| sph_test_tweak_x_scaling( TT_Face face, |
| const FT_String* family, |
| FT_UInt ppem, |
| const FT_String* style, |
| FT_UInt glyph_index ) |
| { |
| return scale_test_tweak( face, family, ppem, style, glyph_index, |
| X_SCALING_Rules, X_SCALING_RULES_SIZE ); |
| } |
| |
| |
| #define TWEAK_RULES( x ) \ |
| if ( sph_test_tweak( face, family, ppem, style, glyph_index, \ |
| x##_Rules, x##_RULES_SIZE ) ) \ |
| loader->exec->sph_tweak_flags |= SPH_TWEAK_##x; |
| |
| #define TWEAK_RULES_EXCEPTIONS( x ) \ |
| if ( sph_test_tweak( face, family, ppem, style, glyph_index, \ |
| x##_Rules_Exceptions, x##_RULES_EXCEPTIONS_SIZE ) ) \ |
| loader->exec->sph_tweak_flags &= ~SPH_TWEAK_##x; |
| |
| |
| FT_LOCAL_DEF( void ) |
| sph_set_tweaks( TT_Loader loader, |
| FT_UInt glyph_index ) |
| { |
| TT_Face face = loader->face; |
| FT_String* family = face->root.family_name; |
| FT_UInt ppem = loader->size->metrics->x_ppem; |
| FT_String* style = face->root.style_name; |
| |
| |
| /* don't apply rules if style isn't set */ |
| if ( !face->root.style_name ) |
| return; |
| |
| #ifdef SPH_DEBUG_MORE_VERBOSE |
| printf( "%s,%d,%s,%c=%d ", |
| family, ppem, style, glyph_index, glyph_index ); |
| #endif |
| |
| TWEAK_RULES( PIXEL_HINTING ); |
| |
| if ( loader->exec->sph_tweak_flags & SPH_TWEAK_PIXEL_HINTING ) |
| { |
| loader->exec->ignore_x_mode = FALSE; |
| return; |
| } |
| |
| TWEAK_RULES( ALLOW_X_DMOVE ); |
| TWEAK_RULES( ALWAYS_DO_DELTAP ); |
| TWEAK_RULES( ALWAYS_SKIP_DELTAP ); |
| TWEAK_RULES( DEEMBOLDEN ); |
| TWEAK_RULES( DO_SHPIX ); |
| TWEAK_RULES( EMBOLDEN ); |
| TWEAK_RULES( MIAP_HACK ); |
| TWEAK_RULES( NORMAL_ROUND ); |
| TWEAK_RULES( NO_ALIGNRP_AFTER_IUP ); |
| TWEAK_RULES( NO_CALL_AFTER_IUP ); |
| TWEAK_RULES( NO_DELTAP_AFTER_IUP ); |
| TWEAK_RULES( RASTERIZER_35 ); |
| TWEAK_RULES( SKIP_IUP ); |
| |
| TWEAK_RULES( SKIP_OFFPIXEL_Y_MOVES ); |
| TWEAK_RULES_EXCEPTIONS( SKIP_OFFPIXEL_Y_MOVES ); |
| |
| TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES_DELTAP ); |
| |
| TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES ); |
| TWEAK_RULES_EXCEPTIONS( SKIP_NONPIXEL_Y_MOVES ); |
| |
| TWEAK_RULES( ROUND_NONPIXEL_Y_MOVES ); |
| TWEAK_RULES_EXCEPTIONS( ROUND_NONPIXEL_Y_MOVES ); |
| |
| if ( loader->exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) |
| { |
| if ( loader->exec->rasterizer_version != TT_INTERPRETER_VERSION_35 ) |
| { |
| loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35; |
| loader->exec->size->cvt_ready = -1; |
| |
| tt_size_ready_bytecode( |
| loader->exec->size, |
| FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) ); |
| } |
| else |
| loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35; |
| } |
| else |
| { |
| if ( loader->exec->rasterizer_version != |
| SPH_OPTION_SET_RASTERIZER_VERSION ) |
| { |
| loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; |
| loader->exec->size->cvt_ready = -1; |
| |
| tt_size_ready_bytecode( |
| loader->exec->size, |
| FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) ); |
| } |
| else |
| loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; |
| } |
| |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| TWEAK_RULES( TIMES_NEW_ROMAN_HACK ); |
| TWEAK_RULES( COURIER_NEW_2_HACK ); |
| } |
| |
| if ( sph_test_tweak( face, family, ppem, style, glyph_index, |
| COMPATIBILITY_MODE_Rules, COMPATIBILITY_MODE_RULES_SIZE ) ) |
| loader->exec->face->sph_compatibility_mode = TRUE; |
| |
| |
| if ( IS_HINTED( loader->load_flags ) ) |
| { |
| if ( sph_test_tweak( face, family, ppem, style, glyph_index, |
| COMPATIBLE_WIDTHS_Rules, COMPATIBLE_WIDTHS_RULES_SIZE ) ) |
| loader->exec->compatible_widths |= TRUE; |
| } |
| } |
| |
| #else /* !(TT_USE_BYTECODE_INTERPRETER && */ |
| /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY) */ |
| |
| /* ANSI C doesn't like empty source files */ |
| typedef int _tt_subpix_dummy; |
| |
| #endif /* !(TT_USE_BYTECODE_INTERPRETER && */ |
| /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY) */ |
| |
| |
| /* END */ |
