1 /**************************************************************************** 2 * 3 * afindic.c 4 * 5 * Auto-fitter hinting routines for Indic writing system (body). 6 * 7 * Copyright (C) 2007-2021 by 8 * Rahul Bhalerao <rahul.bhalerao@redhat.com>, <b.rahul.pm@gmail.com>. 9 * 10 * This file is part of the FreeType project, and may only be used, 11 * modified, and distributed under the terms of the FreeType project 12 * license, LICENSE.TXT. By continuing to use, modify, or distribute 13 * this file you indicate that you have read the license and 14 * understand and accept it fully. 15 * 16 */ 17 18 19 #include "aftypes.h" 20 #include "aflatin.h" 21 #include "afcjk.h" 22 23 24 #ifdef AF_CONFIG_OPTION_INDIC 25 26 #include "afindic.h" 27 #include "aferrors.h" 28 29 30 static FT_Error af_indic_metrics_init(AF_CJKMetrics metrics,FT_Face face)31 af_indic_metrics_init( AF_CJKMetrics metrics, 32 FT_Face face ) 33 { 34 /* skip blue zone init in CJK routines */ 35 FT_CharMap oldmap = face->charmap; 36 37 38 metrics->units_per_em = face->units_per_EM; 39 40 if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) ) 41 face->charmap = NULL; 42 else 43 { 44 af_cjk_metrics_init_widths( metrics, face ); 45 #if 0 46 /* either need indic specific blue_chars[] or just skip blue zones */ 47 af_cjk_metrics_init_blues( metrics, face, af_cjk_blue_chars ); 48 #endif 49 af_cjk_metrics_check_digits( metrics, face ); 50 } 51 52 FT_Set_Charmap( face, oldmap ); 53 54 return FT_Err_Ok; 55 } 56 57 58 static void af_indic_metrics_scale(AF_CJKMetrics metrics,AF_Scaler scaler)59 af_indic_metrics_scale( AF_CJKMetrics metrics, 60 AF_Scaler scaler ) 61 { 62 /* use CJK routines */ 63 af_cjk_metrics_scale( metrics, scaler ); 64 } 65 66 67 static FT_Error af_indic_hints_init(AF_GlyphHints hints,AF_CJKMetrics metrics)68 af_indic_hints_init( AF_GlyphHints hints, 69 AF_CJKMetrics metrics ) 70 { 71 /* use CJK routines */ 72 return af_cjk_hints_init( hints, metrics ); 73 } 74 75 76 static FT_Error af_indic_hints_apply(FT_UInt glyph_index,AF_GlyphHints hints,FT_Outline * outline,AF_CJKMetrics metrics)77 af_indic_hints_apply( FT_UInt glyph_index, 78 AF_GlyphHints hints, 79 FT_Outline* outline, 80 AF_CJKMetrics metrics ) 81 { 82 /* use CJK routines */ 83 return af_cjk_hints_apply( glyph_index, hints, outline, metrics ); 84 } 85 86 87 /* Extract standard_width from writing system/script specific */ 88 /* metrics class. */ 89 90 static void af_indic_get_standard_widths(AF_CJKMetrics metrics,FT_Pos * stdHW,FT_Pos * stdVW)91 af_indic_get_standard_widths( AF_CJKMetrics metrics, 92 FT_Pos* stdHW, 93 FT_Pos* stdVW ) 94 { 95 if ( stdHW ) 96 *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width; 97 98 if ( stdVW ) 99 *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width; 100 } 101 102 103 /*************************************************************************/ 104 /*************************************************************************/ 105 /***** *****/ 106 /***** I N D I C S C R I P T C L A S S *****/ 107 /***** *****/ 108 /*************************************************************************/ 109 /*************************************************************************/ 110 111 112 AF_DEFINE_WRITING_SYSTEM_CLASS( 113 af_indic_writing_system_class, 114 115 AF_WRITING_SYSTEM_INDIC, 116 117 sizeof ( AF_CJKMetricsRec ), 118 119 (AF_WritingSystem_InitMetricsFunc) af_indic_metrics_init, /* style_metrics_init */ 120 (AF_WritingSystem_ScaleMetricsFunc)af_indic_metrics_scale, /* style_metrics_scale */ 121 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 122 (AF_WritingSystem_GetStdWidthsFunc)af_indic_get_standard_widths, /* style_metrics_getstdw */ 123 124 (AF_WritingSystem_InitHintsFunc) af_indic_hints_init, /* style_hints_init */ 125 (AF_WritingSystem_ApplyHintsFunc) af_indic_hints_apply /* style_hints_apply */ 126 ) 127 128 129 #else /* !AF_CONFIG_OPTION_INDIC */ 130 131 132 AF_DEFINE_WRITING_SYSTEM_CLASS( 133 af_indic_writing_system_class, 134 135 AF_WRITING_SYSTEM_INDIC, 136 137 sizeof ( AF_CJKMetricsRec ), 138 139 (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */ 140 (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */ 141 (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */ 142 (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */ 143 144 (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */ 145 (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */ 146 ) 147 148 149 #endif /* !AF_CONFIG_OPTION_INDIC */ 150 151 152 /* END */ 153