1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvmort4.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT mort table validation */ |
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6 /* body for type4 (Non-Contextual Glyph Substitution) 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 void |
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42 gxv_mort_subtable_type4_lookupval_validate( FT_UShort glyph, |
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43 GXV_LookupValueCPtr value_p, |
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44 GXV_Validator valid ) |
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45 { |
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46 FT_UNUSED( glyph ); |
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47 |
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48 gxv_glyphid_validate( value_p->u, valid ); |
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49 } |
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50 |
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51 /* |
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52 +===============+ --------+ |
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53 | lookup header | | |
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54 +===============+ | |
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55 | BinSrchHeader | | |
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56 +===============+ | |
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57 | lastGlyph[0] | | |
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58 +---------------+ | |
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59 | firstGlyph[0] | | head of lookup table |
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60 +---------------+ | + |
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61 | offset[0] | -> | offset [byte] |
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62 +===============+ | + |
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63 | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte] |
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64 +---------------+ | |
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65 | firstGlyph[1] | | |
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66 +---------------+ | |
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67 | offset[1] | | |
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68 +===============+ | |
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69 | |
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70 .... | |
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71 | |
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72 16bit value array | |
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73 +===============+ | |
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74 | value | <-------+ |
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75 .... |
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76 */ |
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77 |
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78 static GXV_LookupValueDesc |
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79 gxv_mort_subtable_type4_lookupfmt4_transit( |
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80 FT_UShort relative_gindex, |
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81 GXV_LookupValueCPtr base_value_p, |
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82 FT_Bytes lookuptbl_limit, |
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83 GXV_Validator valid ) |
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84 { |
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85 FT_Bytes p; |
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86 FT_Bytes limit; |
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87 FT_UShort offset; |
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88 GXV_LookupValueDesc value; |
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89 |
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90 /* XXX: check range? */ |
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91 offset = (FT_UShort)( base_value_p->u + |
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92 relative_gindex * sizeof ( FT_UShort ) ); |
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93 |
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94 p = valid->lookuptbl_head + offset; |
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95 limit = lookuptbl_limit; |
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96 |
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97 GXV_LIMIT_CHECK( 2 ); |
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98 value.u = FT_NEXT_USHORT( p ); |
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99 |
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100 return value; |
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101 } |
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102 |
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103 |
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104 FT_LOCAL_DEF( void ) |
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105 gxv_mort_subtable_type4_validate( FT_Bytes table, |
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106 FT_Bytes limit, |
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107 GXV_Validator valid ) |
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108 { |
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109 FT_Bytes p = table; |
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110 |
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111 |
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112 GXV_NAME_ENTER( "mort chain subtable type4 " |
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113 "(Non-Contextual Glyph Substitution)" ); |
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114 |
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115 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
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116 valid->lookupval_func = gxv_mort_subtable_type4_lookupval_validate; |
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117 valid->lookupfmt4_trans = gxv_mort_subtable_type4_lookupfmt4_transit; |
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118 |
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119 gxv_LookupTable_validate( p, limit, valid ); |
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120 |
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121 GXV_EXIT; |
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122 } |
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123 |
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124 |
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125 /* END */ |
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