1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvmort0.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT mort table validation */ |
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6 /* body for type0 (Indic Script Rearrangement) subtable. */ |
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7 /* */ |
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8 /* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
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9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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10 /* */ |
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11 /* This file is part of the FreeType project, and may only be used, */ |
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12 /* modified, and distributed under the terms of the FreeType project */ |
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13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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14 /* this file you indicate that you have read the license and */ |
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15 /* understand and accept it fully. */ |
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16 /* */ |
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17 /***************************************************************************/ |
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18 |
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19 /***************************************************************************/ |
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20 /* */ |
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21 /* gxvalid is derived from both gxlayout module and otvalid module. */ |
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22 /* Development of gxlayout is supported by the Information-technology */ |
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23 /* Promotion Agency(IPA), Japan. */ |
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24 /* */ |
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25 /***************************************************************************/ |
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26 |
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27 |
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28 #include "gxvmort.h" |
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29 |
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30 |
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31 /*************************************************************************/ |
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32 /* */ |
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33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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35 /* messages during execution. */ |
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36 /* */ |
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37 #undef FT_COMPONENT |
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38 #define FT_COMPONENT trace_gxvmort |
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39 |
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40 |
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41 static const char* GXV_Mort_IndicScript_Msg[] = |
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42 { |
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43 "no change", |
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44 "Ax => xA", |
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45 "xD => Dx", |
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46 "AxD => DxA", |
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47 "ABx => xAB", |
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48 "ABx => xBA", |
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49 "xCD => CDx", |
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50 "xCD => DCx", |
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51 "AxCD => CDxA", |
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52 "AxCD => DCxA", |
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53 "ABxD => DxAB", |
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54 "ABxD => DxBA", |
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55 "ABxCD => CDxAB", |
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56 "ABxCD => CDxBA", |
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57 "ABxCD => DCxAB", |
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58 "ABxCD => DCxBA", |
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59 |
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60 }; |
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61 |
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62 |
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63 static void |
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64 gxv_mort_subtable_type0_entry_validate( |
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65 FT_Byte state, |
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66 FT_UShort flags, |
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67 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, |
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68 FT_Bytes table, |
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69 FT_Bytes limit, |
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70 GXV_Validator valid ) |
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71 { |
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72 FT_UShort markFirst; |
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73 FT_UShort dontAdvance; |
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74 FT_UShort markLast; |
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75 FT_UShort reserved; |
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76 FT_UShort verb = 0; |
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77 |
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78 FT_UNUSED( state ); |
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79 FT_UNUSED( table ); |
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80 FT_UNUSED( limit ); |
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81 |
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82 FT_UNUSED( GXV_Mort_IndicScript_Msg[verb] ); /* for the non-debugging */ |
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83 FT_UNUSED( glyphOffset_p ); /* case */ |
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84 |
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85 |
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86 markFirst = (FT_UShort)( ( flags >> 15 ) & 1 ); |
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87 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
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88 markLast = (FT_UShort)( ( flags >> 13 ) & 1 ); |
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89 |
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90 reserved = (FT_UShort)( flags & 0x1FF0 ); |
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91 verb = (FT_UShort)( flags & 0x000F ); |
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92 |
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93 GXV_TRACE(( " IndicScript MorphRule for glyphOffset 0x%04x", |
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94 glyphOffset_p->u )); |
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95 GXV_TRACE(( " markFirst=%01d", markFirst )); |
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96 GXV_TRACE(( " dontAdvance=%01d", dontAdvance )); |
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97 GXV_TRACE(( " markLast=%01d", markLast )); |
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98 GXV_TRACE(( " %02d", verb )); |
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99 GXV_TRACE(( " %s\n", GXV_Mort_IndicScript_Msg[verb] )); |
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100 |
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101 if ( 0 < reserved ) |
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102 { |
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103 GXV_TRACE(( " non-zero bits found in reserved range\n" )); |
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104 FT_INVALID_DATA; |
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105 } |
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106 else |
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107 GXV_TRACE(( "\n" )); |
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108 } |
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109 |
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110 |
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111 FT_LOCAL_DEF( void ) |
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112 gxv_mort_subtable_type0_validate( FT_Bytes table, |
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113 FT_Bytes limit, |
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114 GXV_Validator valid ) |
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115 { |
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116 FT_Bytes p = table; |
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117 |
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118 |
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119 GXV_NAME_ENTER( |
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120 "mort chain subtable type0 (Indic-Script Rearrangement)" ); |
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121 |
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122 GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE ); |
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123 |
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124 valid->statetable.optdata = NULL; |
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125 valid->statetable.optdata_load_func = NULL; |
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126 valid->statetable.subtable_setup_func = NULL; |
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127 valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE; |
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128 valid->statetable.entry_validate_func = |
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129 gxv_mort_subtable_type0_entry_validate; |
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130 |
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131 gxv_StateTable_validate( p, limit, valid ); |
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132 |
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133 GXV_EXIT; |
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134 } |
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135 |
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136 |
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137 /* END */ |
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