--- /dev/null
+/***************************************************************************/
+/* */
+/* ttsubpix.c */
+/* */
+/* TrueType Subpixel Hinting. */
+/* */
+/* Copyright 2010-2017 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 <ft2build.h>
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_CALC_H
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_SFNT_H
+#include FT_TRUETYPE_TAGS_H
+#include FT_OUTLINE_H
+#include FT_TRUETYPE_DRIVER_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 ( strcmp( detected_font_name, rule_font_name ) == 0 )
+ return TRUE;
+
+ /* Is font name a wildcard ""? */
+ if ( 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 ( strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 )
+ {
+ for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ )
+ {
+ if ( strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 )
+ continue;
+ if ( 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 ( strcmp( detected_font_style, rule_font_style ) == 0 )
+ return TRUE;
+
+ /* Is font style a wildcard ""? */
+ if ( 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 ( strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 )
+ {
+ for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ )
+ {
+ if ( strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 )
+ continue;
+ if ( 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 */
projects / reactos.git / blobdiff