1 /***************************************************************************/ |
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2 /* */ |
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3 /* t1decode.c */ |
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4 /* */ |
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5 /* PostScript Type 1 decoding routines (body). */ |
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6 /* */ |
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7 /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 */ |
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8 /* 2010 by */ |
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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 #include <ft2build.h> |
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21 #include FT_INTERNAL_CALC_H |
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22 #include FT_INTERNAL_DEBUG_H |
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23 #include FT_INTERNAL_POSTSCRIPT_HINTS_H |
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24 #include FT_OUTLINE_H |
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25 |
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26 #include "t1decode.h" |
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27 #include "psobjs.h" |
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28 |
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29 #include "psauxerr.h" |
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30 |
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31 |
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32 /*************************************************************************/ |
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33 /* */ |
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34 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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35 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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36 /* messages during execution. */ |
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37 /* */ |
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38 #undef FT_COMPONENT |
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39 #define FT_COMPONENT trace_t1decode |
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40 |
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41 |
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42 typedef enum T1_Operator_ |
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43 { |
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44 op_none = 0, |
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45 op_endchar, |
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46 op_hsbw, |
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47 op_seac, |
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48 op_sbw, |
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49 op_closepath, |
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50 op_hlineto, |
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51 op_hmoveto, |
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52 op_hvcurveto, |
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53 op_rlineto, |
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54 op_rmoveto, |
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55 op_rrcurveto, |
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56 op_vhcurveto, |
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57 op_vlineto, |
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58 op_vmoveto, |
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59 op_dotsection, |
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60 op_hstem, |
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61 op_hstem3, |
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62 op_vstem, |
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63 op_vstem3, |
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64 op_div, |
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65 op_callothersubr, |
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66 op_callsubr, |
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67 op_pop, |
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68 op_return, |
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69 op_setcurrentpoint, |
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70 op_unknown15, |
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71 |
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72 op_max /* never remove this one */ |
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73 |
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74 } T1_Operator; |
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75 |
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76 |
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77 static |
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78 const FT_Int t1_args_count[op_max] = |
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79 { |
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80 0, /* none */ |
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81 0, /* endchar */ |
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82 2, /* hsbw */ |
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83 5, /* seac */ |
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84 4, /* sbw */ |
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85 0, /* closepath */ |
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86 1, /* hlineto */ |
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87 1, /* hmoveto */ |
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88 4, /* hvcurveto */ |
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89 2, /* rlineto */ |
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90 2, /* rmoveto */ |
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91 6, /* rrcurveto */ |
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92 4, /* vhcurveto */ |
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93 1, /* vlineto */ |
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94 1, /* vmoveto */ |
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95 0, /* dotsection */ |
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96 2, /* hstem */ |
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97 6, /* hstem3 */ |
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98 2, /* vstem */ |
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99 6, /* vstem3 */ |
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100 2, /* div */ |
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101 -1, /* callothersubr */ |
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102 1, /* callsubr */ |
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103 0, /* pop */ |
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104 0, /* return */ |
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105 2, /* setcurrentpoint */ |
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106 2 /* opcode 15 (undocumented and obsolete) */ |
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107 }; |
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108 |
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109 |
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110 /*************************************************************************/ |
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111 /* */ |
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112 /* <Function> */ |
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113 /* t1_lookup_glyph_by_stdcharcode */ |
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114 /* */ |
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115 /* <Description> */ |
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116 /* Looks up a given glyph by its StandardEncoding charcode. Used to */ |
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117 /* implement the SEAC Type 1 operator. */ |
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118 /* */ |
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119 /* <Input> */ |
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120 /* face :: The current face object. */ |
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121 /* */ |
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122 /* charcode :: The character code to look for. */ |
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123 /* */ |
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124 /* <Return> */ |
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125 /* A glyph index in the font face. Returns -1 if the corresponding */ |
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126 /* glyph wasn't found. */ |
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127 /* */ |
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128 static FT_Int |
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129 t1_lookup_glyph_by_stdcharcode( T1_Decoder decoder, |
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130 FT_Int charcode ) |
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131 { |
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132 FT_UInt n; |
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133 const FT_String* glyph_name; |
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134 FT_Service_PsCMaps psnames = decoder->psnames; |
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135 |
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136 |
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137 /* check range of standard char code */ |
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138 if ( charcode < 0 || charcode > 255 ) |
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139 return -1; |
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140 |
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141 glyph_name = psnames->adobe_std_strings( |
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142 psnames->adobe_std_encoding[charcode]); |
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143 |
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144 for ( n = 0; n < decoder->num_glyphs; n++ ) |
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145 { |
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146 FT_String* name = (FT_String*)decoder->glyph_names[n]; |
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147 |
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148 |
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149 if ( name && |
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150 name[0] == glyph_name[0] && |
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151 ft_strcmp( name, glyph_name ) == 0 ) |
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152 return n; |
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153 } |
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154 |
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155 return -1; |
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156 } |
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157 |
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158 |
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159 /*************************************************************************/ |
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160 /* */ |
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161 /* <Function> */ |
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162 /* t1operator_seac */ |
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163 /* */ |
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164 /* <Description> */ |
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165 /* Implements the `seac' Type 1 operator for a Type 1 decoder. */ |
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166 /* */ |
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167 /* <Input> */ |
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168 /* decoder :: The current CID decoder. */ |
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169 /* */ |
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170 /* asb :: The accent's side bearing. */ |
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171 /* */ |
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172 /* adx :: The horizontal offset of the accent. */ |
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173 /* */ |
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174 /* ady :: The vertical offset of the accent. */ |
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175 /* */ |
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176 /* bchar :: The base character's StandardEncoding charcode. */ |
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177 /* */ |
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178 /* achar :: The accent character's StandardEncoding charcode. */ |
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179 /* */ |
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180 /* <Return> */ |
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181 /* FreeType error code. 0 means success. */ |
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182 /* */ |
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183 static FT_Error |
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184 t1operator_seac( T1_Decoder decoder, |
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185 FT_Pos asb, |
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186 FT_Pos adx, |
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187 FT_Pos ady, |
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188 FT_Int bchar, |
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189 FT_Int achar ) |
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190 { |
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191 FT_Error error; |
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192 FT_Int bchar_index, achar_index; |
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193 #if 0 |
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194 FT_Int n_base_points; |
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195 FT_Outline* base = decoder->builder.base; |
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196 #endif |
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197 FT_Vector left_bearing, advance; |
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198 |
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199 #ifdef FT_CONFIG_OPTION_INCREMENTAL |
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200 T1_Face face = (T1_Face)decoder->builder.face; |
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201 #endif |
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202 |
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203 |
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204 if ( decoder->seac ) |
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205 { |
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206 FT_ERROR(( "t1operator_seac: invalid nested seac\n" )); |
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207 return PSaux_Err_Syntax_Error; |
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208 } |
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209 |
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210 /* seac weirdness */ |
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211 adx += decoder->builder.left_bearing.x; |
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212 |
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213 /* `glyph_names' is set to 0 for CID fonts which do not */ |
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214 /* include an encoding. How can we deal with these? */ |
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215 #ifdef FT_CONFIG_OPTION_INCREMENTAL |
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216 if ( decoder->glyph_names == 0 && |
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217 !face->root.internal->incremental_interface ) |
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218 #else |
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219 if ( decoder->glyph_names == 0 ) |
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220 #endif /* FT_CONFIG_OPTION_INCREMENTAL */ |
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221 { |
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222 FT_ERROR(( "t1operator_seac:" |
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223 " glyph names table not available in this font\n" )); |
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224 return PSaux_Err_Syntax_Error; |
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225 } |
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226 |
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227 #ifdef FT_CONFIG_OPTION_INCREMENTAL |
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228 if ( face->root.internal->incremental_interface ) |
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229 { |
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230 /* the caller must handle the font encoding also */ |
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231 bchar_index = bchar; |
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232 achar_index = achar; |
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233 } |
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234 else |
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235 #endif |
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236 { |
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237 bchar_index = t1_lookup_glyph_by_stdcharcode( decoder, bchar ); |
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238 achar_index = t1_lookup_glyph_by_stdcharcode( decoder, achar ); |
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239 } |
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240 |
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241 if ( bchar_index < 0 || achar_index < 0 ) |
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242 { |
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243 FT_ERROR(( "t1operator_seac:" |
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244 " invalid seac character code arguments\n" )); |
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245 return PSaux_Err_Syntax_Error; |
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246 } |
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247 |
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248 /* if we are trying to load a composite glyph, do not load the */ |
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249 /* accent character and return the array of subglyphs. */ |
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250 if ( decoder->builder.no_recurse ) |
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251 { |
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252 FT_GlyphSlot glyph = (FT_GlyphSlot)decoder->builder.glyph; |
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253 FT_GlyphLoader loader = glyph->internal->loader; |
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254 FT_SubGlyph subg; |
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255 |
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256 |
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257 /* reallocate subglyph array if necessary */ |
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258 error = FT_GlyphLoader_CheckSubGlyphs( loader, 2 ); |
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259 if ( error ) |
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260 goto Exit; |
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261 |
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262 subg = loader->current.subglyphs; |
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263 |
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264 /* subglyph 0 = base character */ |
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265 subg->index = bchar_index; |
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266 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES | |
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267 FT_SUBGLYPH_FLAG_USE_MY_METRICS; |
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268 subg->arg1 = 0; |
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269 subg->arg2 = 0; |
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270 subg++; |
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271 |
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272 /* subglyph 1 = accent character */ |
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273 subg->index = achar_index; |
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274 subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES; |
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275 subg->arg1 = (FT_Int)FIXED_TO_INT( adx - asb ); |
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276 subg->arg2 = (FT_Int)FIXED_TO_INT( ady ); |
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277 |
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278 /* set up remaining glyph fields */ |
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279 glyph->num_subglyphs = 2; |
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280 glyph->subglyphs = loader->base.subglyphs; |
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281 glyph->format = FT_GLYPH_FORMAT_COMPOSITE; |
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282 |
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283 loader->current.num_subglyphs = 2; |
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284 goto Exit; |
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285 } |
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286 |
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287 /* First load `bchar' in builder */ |
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288 /* now load the unscaled outline */ |
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289 |
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290 FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */ |
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291 |
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292 /* the seac operator must not be nested */ |
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293 decoder->seac = TRUE; |
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294 error = t1_decoder_parse_glyph( decoder, bchar_index ); |
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295 decoder->seac = FALSE; |
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296 if ( error ) |
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297 goto Exit; |
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298 |
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299 /* save the left bearing and width of the base character */ |
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300 /* as they will be erased by the next load. */ |
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301 |
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302 left_bearing = decoder->builder.left_bearing; |
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303 advance = decoder->builder.advance; |
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304 |
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305 decoder->builder.left_bearing.x = 0; |
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306 decoder->builder.left_bearing.y = 0; |
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307 |
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308 decoder->builder.pos_x = adx - asb; |
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309 decoder->builder.pos_y = ady; |
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310 |
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311 /* Now load `achar' on top of */ |
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312 /* the base outline */ |
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313 |
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314 /* the seac operator must not be nested */ |
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315 decoder->seac = TRUE; |
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316 error = t1_decoder_parse_glyph( decoder, achar_index ); |
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317 decoder->seac = FALSE; |
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318 if ( error ) |
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319 goto Exit; |
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320 |
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321 /* restore the left side bearing and */ |
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322 /* advance width of the base character */ |
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323 |
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324 decoder->builder.left_bearing = left_bearing; |
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325 decoder->builder.advance = advance; |
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326 |
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327 decoder->builder.pos_x = 0; |
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328 decoder->builder.pos_y = 0; |
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329 |
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330 Exit: |
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331 return error; |
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332 } |
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333 |
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334 |
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335 /*************************************************************************/ |
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336 /* */ |
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337 /* <Function> */ |
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338 /* t1_decoder_parse_charstrings */ |
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339 /* */ |
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340 /* <Description> */ |
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341 /* Parses a given Type 1 charstrings program. */ |
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342 /* */ |
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343 /* <Input> */ |
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344 /* decoder :: The current Type 1 decoder. */ |
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345 /* */ |
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346 /* charstring_base :: The base address of the charstring stream. */ |
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347 /* */ |
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348 /* charstring_len :: The length in bytes of the charstring stream. */ |
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349 /* */ |
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350 /* <Return> */ |
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351 /* FreeType error code. 0 means success. */ |
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352 /* */ |
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353 FT_LOCAL_DEF( FT_Error ) |
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354 t1_decoder_parse_charstrings( T1_Decoder decoder, |
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355 FT_Byte* charstring_base, |
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356 FT_UInt charstring_len ) |
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357 { |
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358 FT_Error error; |
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359 T1_Decoder_Zone zone; |
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360 FT_Byte* ip; |
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361 FT_Byte* limit; |
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362 T1_Builder builder = &decoder->builder; |
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363 FT_Pos x, y, orig_x, orig_y; |
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364 FT_Int known_othersubr_result_cnt = 0; |
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365 FT_Int unknown_othersubr_result_cnt = 0; |
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366 FT_Bool large_int; |
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367 FT_Fixed seed; |
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368 |
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369 T1_Hints_Funcs hinter; |
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370 |
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371 #ifdef FT_DEBUG_LEVEL_TRACE |
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372 FT_Bool bol = TRUE; |
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373 #endif |
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374 |
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375 |
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376 /* compute random seed from stack address of parameter */ |
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377 seed = (FT_Fixed)( ( (FT_PtrDist)(char*)&seed ^ |
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378 (FT_PtrDist)(char*)&decoder ^ |
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379 (FT_PtrDist)(char*)&charstring_base ) & |
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380 FT_ULONG_MAX ) ; |
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381 seed = ( seed ^ ( seed >> 10 ) ^ ( seed >> 20 ) ) & 0xFFFFL; |
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382 if ( seed == 0 ) |
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383 seed = 0x7384; |
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384 |
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385 /* First of all, initialize the decoder */ |
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386 decoder->top = decoder->stack; |
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387 decoder->zone = decoder->zones; |
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388 zone = decoder->zones; |
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389 |
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390 builder->parse_state = T1_Parse_Start; |
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391 |
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392 hinter = (T1_Hints_Funcs)builder->hints_funcs; |
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393 |
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394 /* a font that reads BuildCharArray without setting */ |
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395 /* its values first is buggy, but ... */ |
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396 FT_ASSERT( ( decoder->len_buildchar == 0 ) == |
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397 ( decoder->buildchar == NULL ) ); |
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398 |
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399 if ( decoder->len_buildchar > 0 ) |
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400 ft_memset( &decoder->buildchar[0], |
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401 0, |
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402 sizeof( decoder->buildchar[0] ) * decoder->len_buildchar ); |
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403 |
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404 FT_TRACE4(( "\n" |
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405 "Start charstring\n" )); |
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406 |
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407 zone->base = charstring_base; |
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408 limit = zone->limit = charstring_base + charstring_len; |
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409 ip = zone->cursor = zone->base; |
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410 |
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411 error = PSaux_Err_Ok; |
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412 |
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413 x = orig_x = builder->pos_x; |
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414 y = orig_y = builder->pos_y; |
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415 |
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416 /* begin hints recording session, if any */ |
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417 if ( hinter ) |
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418 hinter->open( hinter->hints ); |
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419 |
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420 large_int = FALSE; |
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421 |
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422 /* now, execute loop */ |
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423 while ( ip < limit ) |
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424 { |
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425 FT_Long* top = decoder->top; |
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426 T1_Operator op = op_none; |
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427 FT_Int32 value = 0; |
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428 |
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429 |
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430 FT_ASSERT( known_othersubr_result_cnt == 0 || |
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431 unknown_othersubr_result_cnt == 0 ); |
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432 |
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433 #ifdef FT_DEBUG_LEVEL_TRACE |
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434 if ( bol ) |
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435 { |
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436 FT_TRACE5(( " (%d)", decoder->top - decoder->stack )); |
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437 bol = FALSE; |
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438 } |
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439 #endif |
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440 |
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441 /*********************************************************************/ |
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442 /* */ |
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443 /* Decode operator or operand */ |
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444 /* */ |
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445 /* */ |
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446 |
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447 /* first of all, decompress operator or value */ |
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448 switch ( *ip++ ) |
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449 { |
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450 case 1: |
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451 op = op_hstem; |
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452 break; |
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453 |
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454 case 3: |
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455 op = op_vstem; |
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456 break; |
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457 case 4: |
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458 op = op_vmoveto; |
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459 break; |
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460 case 5: |
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461 op = op_rlineto; |
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462 break; |
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463 case 6: |
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464 op = op_hlineto; |
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465 break; |
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466 case 7: |
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467 op = op_vlineto; |
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468 break; |
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469 case 8: |
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470 op = op_rrcurveto; |
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471 break; |
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472 case 9: |
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473 op = op_closepath; |
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474 break; |
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475 case 10: |
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476 op = op_callsubr; |
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477 break; |
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478 case 11: |
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479 op = op_return; |
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480 break; |
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481 |
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482 case 13: |
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483 op = op_hsbw; |
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484 break; |
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485 case 14: |
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486 op = op_endchar; |
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487 break; |
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488 |
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489 case 15: /* undocumented, obsolete operator */ |
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490 op = op_unknown15; |
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491 break; |
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492 |
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493 case 21: |
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494 op = op_rmoveto; |
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495 break; |
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496 case 22: |
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497 op = op_hmoveto; |
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498 break; |
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499 |
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500 case 30: |
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501 op = op_vhcurveto; |
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502 break; |
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503 case 31: |
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504 op = op_hvcurveto; |
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505 break; |
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506 |
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507 case 12: |
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508 if ( ip > limit ) |
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509 { |
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510 FT_ERROR(( "t1_decoder_parse_charstrings:" |
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511 " invalid escape (12+EOF)\n" )); |
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512 goto Syntax_Error; |
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513 } |
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514 |
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515 switch ( *ip++ ) |
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516 { |
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517 case 0: |
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518 op = op_dotsection; |
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519 break; |
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520 case 1: |
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521 op = op_vstem3; |
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522 break; |
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523 case 2: |
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524 op = op_hstem3; |
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525 break; |
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526 case 6: |
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527 op = op_seac; |
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528 break; |
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529 case 7: |
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530 op = op_sbw; |
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531 break; |
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532 case 12: |
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533 op = op_div; |
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534 break; |
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535 case 16: |
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536 op = op_callothersubr; |
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537 break; |
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538 case 17: |
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539 op = op_pop; |
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540 break; |
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541 case 33: |
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542 op = op_setcurrentpoint; |
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543 break; |
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544 |
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545 default: |
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546 FT_ERROR(( "t1_decoder_parse_charstrings:" |
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547 " invalid escape (12+%d)\n", |
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548 ip[-1] )); |
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549 goto Syntax_Error; |
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550 } |
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551 break; |
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552 |
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553 case 255: /* four bytes integer */ |
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554 if ( ip + 4 > limit ) |
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555 { |
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556 FT_ERROR(( "t1_decoder_parse_charstrings:" |
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557 " unexpected EOF in integer\n" )); |
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558 goto Syntax_Error; |
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559 } |
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560 |
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561 value = (FT_Int32)( ( (FT_Long)ip[0] << 24 ) | |
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562 ( (FT_Long)ip[1] << 16 ) | |
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563 ( (FT_Long)ip[2] << 8 ) | |
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564 ip[3] ); |
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565 ip += 4; |
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566 |
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567 /* According to the specification, values > 32000 or < -32000 must */ |
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568 /* be followed by a `div' operator to make the result be in the */ |
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569 /* range [-32000;32000]. We expect that the second argument of */ |
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570 /* `div' is not a large number. Additionally, we don't handle */ |
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571 /* stuff like `<large1> <large2> <num> div <num> div' or */ |
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572 /* <large1> <large2> <num> div div'. This is probably not allowed */ |
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573 /* anyway. */ |
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574 if ( value > 32000 || value < -32000 ) |
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575 { |
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576 if ( large_int ) |
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577 { |
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578 FT_ERROR(( "t1_decoder_parse_charstrings:" |
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579 " no `div' after large integer\n" )); |
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580 } |
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581 else |
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582 large_int = TRUE; |
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583 } |
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584 else |
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585 { |
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586 if ( !large_int ) |
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587 value <<= 16; |
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588 } |
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589 |
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590 break; |
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591 |
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592 default: |
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593 if ( ip[-1] >= 32 ) |
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594 { |
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595 if ( ip[-1] < 247 ) |
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596 value = (FT_Int32)ip[-1] - 139; |
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597 else |
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598 { |
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599 if ( ++ip > limit ) |
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600 { |
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601 FT_ERROR(( "t1_decoder_parse_charstrings:" |
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602 " unexpected EOF in integer\n" )); |
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603 goto Syntax_Error; |
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604 } |
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605 |
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606 if ( ip[-2] < 251 ) |
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607 value = ( ( (FT_Int32)ip[-2] - 247 ) << 8 ) + ip[-1] + 108; |
|
608 else |
|
609 value = -( ( ( (FT_Int32)ip[-2] - 251 ) << 8 ) + ip[-1] + 108 ); |
|
610 } |
|
611 |
|
612 if ( !large_int ) |
|
613 value <<= 16; |
|
614 } |
|
615 else |
|
616 { |
|
617 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
618 " invalid byte (%d)\n", ip[-1] )); |
|
619 goto Syntax_Error; |
|
620 } |
|
621 } |
|
622 |
|
623 if ( unknown_othersubr_result_cnt > 0 ) |
|
624 { |
|
625 switch ( op ) |
|
626 { |
|
627 case op_callsubr: |
|
628 case op_return: |
|
629 case op_none: |
|
630 case op_pop: |
|
631 break; |
|
632 |
|
633 default: |
|
634 /* all operands have been transferred by previous pops */ |
|
635 unknown_othersubr_result_cnt = 0; |
|
636 break; |
|
637 } |
|
638 } |
|
639 |
|
640 if ( large_int && !( op == op_none || op == op_div ) ) |
|
641 { |
|
642 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
643 " no `div' after large integer\n" )); |
|
644 |
|
645 large_int = FALSE; |
|
646 } |
|
647 |
|
648 /*********************************************************************/ |
|
649 /* */ |
|
650 /* Push value on stack, or process operator */ |
|
651 /* */ |
|
652 /* */ |
|
653 if ( op == op_none ) |
|
654 { |
|
655 if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS ) |
|
656 { |
|
657 FT_ERROR(( "t1_decoder_parse_charstrings: stack overflow\n" )); |
|
658 goto Syntax_Error; |
|
659 } |
|
660 |
|
661 #ifdef FT_DEBUG_LEVEL_TRACE |
|
662 if ( large_int ) |
|
663 FT_TRACE4(( " %ld", value )); |
|
664 else |
|
665 FT_TRACE4(( " %ld", (FT_Int32)( value >> 16 ) )); |
|
666 #endif |
|
667 |
|
668 *top++ = value; |
|
669 decoder->top = top; |
|
670 } |
|
671 else if ( op == op_callothersubr ) /* callothersubr */ |
|
672 { |
|
673 FT_Int subr_no; |
|
674 FT_Int arg_cnt; |
|
675 |
|
676 |
|
677 #ifdef FT_DEBUG_LEVEL_TRACE |
|
678 FT_TRACE4(( " callothersubr\n" )); |
|
679 bol = TRUE; |
|
680 #endif |
|
681 |
|
682 if ( top - decoder->stack < 2 ) |
|
683 goto Stack_Underflow; |
|
684 |
|
685 top -= 2; |
|
686 |
|
687 subr_no = (FT_Int)( top[1] >> 16 ); |
|
688 arg_cnt = (FT_Int)( top[0] >> 16 ); |
|
689 |
|
690 /***********************************************************/ |
|
691 /* */ |
|
692 /* remove all operands to callothersubr from the stack */ |
|
693 /* */ |
|
694 /* for handled othersubrs, where we know the number of */ |
|
695 /* arguments, we increase the stack by the value of */ |
|
696 /* known_othersubr_result_cnt */ |
|
697 /* */ |
|
698 /* for unhandled othersubrs the following pops adjust the */ |
|
699 /* stack pointer as necessary */ |
|
700 |
|
701 if ( arg_cnt > top - decoder->stack ) |
|
702 goto Stack_Underflow; |
|
703 |
|
704 top -= arg_cnt; |
|
705 |
|
706 known_othersubr_result_cnt = 0; |
|
707 unknown_othersubr_result_cnt = 0; |
|
708 |
|
709 /* XXX TODO: The checks to `arg_count == <whatever>' */ |
|
710 /* might not be correct; an othersubr expects a certain */ |
|
711 /* number of operands on the PostScript stack (as opposed */ |
|
712 /* to the T1 stack) but it doesn't have to put them there */ |
|
713 /* by itself; previous othersubrs might have left the */ |
|
714 /* operands there if they were not followed by an */ |
|
715 /* appropriate number of pops */ |
|
716 /* */ |
|
717 /* On the other hand, Adobe Reader 7.0.8 for Linux doesn't */ |
|
718 /* accept a font that contains charstrings like */ |
|
719 /* */ |
|
720 /* 100 200 2 20 callothersubr */ |
|
721 /* 300 1 20 callothersubr pop */ |
|
722 /* */ |
|
723 /* Perhaps this is the reason why BuildCharArray exists. */ |
|
724 |
|
725 switch ( subr_no ) |
|
726 { |
|
727 case 1: /* start flex feature */ |
|
728 if ( arg_cnt != 0 ) |
|
729 goto Unexpected_OtherSubr; |
|
730 |
|
731 decoder->flex_state = 1; |
|
732 decoder->num_flex_vectors = 0; |
|
733 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
734 != PSaux_Err_Ok || |
|
735 ( error = t1_builder_check_points( builder, 6 ) ) |
|
736 != PSaux_Err_Ok ) |
|
737 goto Fail; |
|
738 break; |
|
739 |
|
740 case 2: /* add flex vectors */ |
|
741 { |
|
742 FT_Int idx; |
|
743 |
|
744 |
|
745 if ( arg_cnt != 0 ) |
|
746 goto Unexpected_OtherSubr; |
|
747 |
|
748 /* note that we should not add a point for index 0; */ |
|
749 /* this will move our current position to the flex */ |
|
750 /* point without adding any point to the outline */ |
|
751 idx = decoder->num_flex_vectors++; |
|
752 if ( idx > 0 && idx < 7 ) |
|
753 t1_builder_add_point( builder, |
|
754 x, |
|
755 y, |
|
756 (FT_Byte)( idx == 3 || idx == 6 ) ); |
|
757 } |
|
758 break; |
|
759 |
|
760 case 0: /* end flex feature */ |
|
761 if ( arg_cnt != 3 ) |
|
762 goto Unexpected_OtherSubr; |
|
763 |
|
764 if ( decoder->flex_state == 0 || |
|
765 decoder->num_flex_vectors != 7 ) |
|
766 { |
|
767 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
768 " unexpected flex end\n" )); |
|
769 goto Syntax_Error; |
|
770 } |
|
771 |
|
772 /* the two `results' are popped by the following setcurrentpoint */ |
|
773 top[0] = x; |
|
774 top[1] = y; |
|
775 known_othersubr_result_cnt = 2; |
|
776 break; |
|
777 |
|
778 case 3: /* change hints */ |
|
779 if ( arg_cnt != 1 ) |
|
780 goto Unexpected_OtherSubr; |
|
781 |
|
782 known_othersubr_result_cnt = 1; |
|
783 |
|
784 if ( hinter ) |
|
785 hinter->reset( hinter->hints, builder->current->n_points ); |
|
786 break; |
|
787 |
|
788 case 12: |
|
789 case 13: |
|
790 /* counter control hints, clear stack */ |
|
791 top = decoder->stack; |
|
792 break; |
|
793 |
|
794 case 14: |
|
795 case 15: |
|
796 case 16: |
|
797 case 17: |
|
798 case 18: /* multiple masters */ |
|
799 { |
|
800 PS_Blend blend = decoder->blend; |
|
801 FT_UInt num_points, nn, mm; |
|
802 FT_Long* delta; |
|
803 FT_Long* values; |
|
804 |
|
805 |
|
806 if ( !blend ) |
|
807 { |
|
808 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
809 " unexpected multiple masters operator\n" )); |
|
810 goto Syntax_Error; |
|
811 } |
|
812 |
|
813 num_points = (FT_UInt)subr_no - 13 + ( subr_no == 18 ); |
|
814 if ( arg_cnt != (FT_Int)( num_points * blend->num_designs ) ) |
|
815 { |
|
816 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
817 " incorrect number of multiple masters arguments\n" )); |
|
818 goto Syntax_Error; |
|
819 } |
|
820 |
|
821 /* we want to compute: */ |
|
822 /* */ |
|
823 /* a0*w0 + a1*w1 + ... + ak*wk */ |
|
824 /* */ |
|
825 /* but we only have the a0, a1-a0, a2-a0, .. ak-a0 */ |
|
826 /* however, given that w0 + w1 + ... + wk == 1, we can */ |
|
827 /* rewrite it easily as: */ |
|
828 /* */ |
|
829 /* a0 + (a1-a0)*w1 + (a2-a0)*w2 + .. + (ak-a0)*wk */ |
|
830 /* */ |
|
831 /* where k == num_designs-1 */ |
|
832 /* */ |
|
833 /* I guess that's why it's written in this `compact' */ |
|
834 /* form. */ |
|
835 /* */ |
|
836 delta = top + num_points; |
|
837 values = top; |
|
838 for ( nn = 0; nn < num_points; nn++ ) |
|
839 { |
|
840 FT_Long tmp = values[0]; |
|
841 |
|
842 |
|
843 for ( mm = 1; mm < blend->num_designs; mm++ ) |
|
844 tmp += FT_MulFix( *delta++, blend->weight_vector[mm] ); |
|
845 |
|
846 *values++ = tmp; |
|
847 } |
|
848 |
|
849 known_othersubr_result_cnt = num_points; |
|
850 break; |
|
851 } |
|
852 |
|
853 case 19: |
|
854 /* <idx> 1 19 callothersubr */ |
|
855 /* => replace elements starting from index cvi( <idx> ) */ |
|
856 /* of BuildCharArray with WeightVector */ |
|
857 { |
|
858 FT_Int idx; |
|
859 PS_Blend blend = decoder->blend; |
|
860 |
|
861 |
|
862 if ( arg_cnt != 1 || blend == NULL ) |
|
863 goto Unexpected_OtherSubr; |
|
864 |
|
865 idx = (FT_Int)( top[0] >> 16 ); |
|
866 |
|
867 if ( idx < 0 || |
|
868 idx + blend->num_designs > decoder->len_buildchar ) |
|
869 goto Unexpected_OtherSubr; |
|
870 |
|
871 ft_memcpy( &decoder->buildchar[idx], |
|
872 blend->weight_vector, |
|
873 blend->num_designs * |
|
874 sizeof( blend->weight_vector[0] ) ); |
|
875 } |
|
876 break; |
|
877 |
|
878 case 20: |
|
879 /* <arg1> <arg2> 2 20 callothersubr pop */ |
|
880 /* ==> push <arg1> + <arg2> onto T1 stack */ |
|
881 if ( arg_cnt != 2 ) |
|
882 goto Unexpected_OtherSubr; |
|
883 |
|
884 top[0] += top[1]; /* XXX (over|under)flow */ |
|
885 |
|
886 known_othersubr_result_cnt = 1; |
|
887 break; |
|
888 |
|
889 case 21: |
|
890 /* <arg1> <arg2> 2 21 callothersubr pop */ |
|
891 /* ==> push <arg1> - <arg2> onto T1 stack */ |
|
892 if ( arg_cnt != 2 ) |
|
893 goto Unexpected_OtherSubr; |
|
894 |
|
895 top[0] -= top[1]; /* XXX (over|under)flow */ |
|
896 |
|
897 known_othersubr_result_cnt = 1; |
|
898 break; |
|
899 |
|
900 case 22: |
|
901 /* <arg1> <arg2> 2 22 callothersubr pop */ |
|
902 /* ==> push <arg1> * <arg2> onto T1 stack */ |
|
903 if ( arg_cnt != 2 ) |
|
904 goto Unexpected_OtherSubr; |
|
905 |
|
906 top[0] = FT_MulFix( top[0], top[1] ); |
|
907 |
|
908 known_othersubr_result_cnt = 1; |
|
909 break; |
|
910 |
|
911 case 23: |
|
912 /* <arg1> <arg2> 2 23 callothersubr pop */ |
|
913 /* ==> push <arg1> / <arg2> onto T1 stack */ |
|
914 if ( arg_cnt != 2 || top[1] == 0 ) |
|
915 goto Unexpected_OtherSubr; |
|
916 |
|
917 top[0] = FT_DivFix( top[0], top[1] ); |
|
918 |
|
919 known_othersubr_result_cnt = 1; |
|
920 break; |
|
921 |
|
922 case 24: |
|
923 /* <val> <idx> 2 24 callothersubr */ |
|
924 /* ==> set BuildCharArray[cvi( <idx> )] = <val> */ |
|
925 { |
|
926 FT_Int idx; |
|
927 PS_Blend blend = decoder->blend; |
|
928 |
|
929 |
|
930 if ( arg_cnt != 2 || blend == NULL ) |
|
931 goto Unexpected_OtherSubr; |
|
932 |
|
933 idx = (FT_Int)( top[1] >> 16 ); |
|
934 |
|
935 if ( idx < 0 || (FT_UInt) idx >= decoder->len_buildchar ) |
|
936 goto Unexpected_OtherSubr; |
|
937 |
|
938 decoder->buildchar[idx] = top[0]; |
|
939 } |
|
940 break; |
|
941 |
|
942 case 25: |
|
943 /* <idx> 1 25 callothersubr pop */ |
|
944 /* ==> push BuildCharArray[cvi( idx )] */ |
|
945 /* onto T1 stack */ |
|
946 { |
|
947 FT_Int idx; |
|
948 PS_Blend blend = decoder->blend; |
|
949 |
|
950 |
|
951 if ( arg_cnt != 1 || blend == NULL ) |
|
952 goto Unexpected_OtherSubr; |
|
953 |
|
954 idx = (FT_Int)( top[0] >> 16 ); |
|
955 |
|
956 if ( idx < 0 || (FT_UInt) idx >= decoder->len_buildchar ) |
|
957 goto Unexpected_OtherSubr; |
|
958 |
|
959 top[0] = decoder->buildchar[idx]; |
|
960 } |
|
961 |
|
962 known_othersubr_result_cnt = 1; |
|
963 break; |
|
964 |
|
965 #if 0 |
|
966 case 26: |
|
967 /* <val> mark <idx> ==> set BuildCharArray[cvi( <idx> )] = <val>, */ |
|
968 /* leave mark on T1 stack */ |
|
969 /* <val> <idx> ==> set BuildCharArray[cvi( <idx> )] = <val> */ |
|
970 XXX which routine has left its mark on the (PostScript) stack?; |
|
971 break; |
|
972 #endif |
|
973 |
|
974 case 27: |
|
975 /* <res1> <res2> <val1> <val2> 4 27 callothersubr pop */ |
|
976 /* ==> push <res1> onto T1 stack if <val1> <= <val2>, */ |
|
977 /* otherwise push <res2> */ |
|
978 if ( arg_cnt != 4 ) |
|
979 goto Unexpected_OtherSubr; |
|
980 |
|
981 if ( top[2] > top[3] ) |
|
982 top[0] = top[1]; |
|
983 |
|
984 known_othersubr_result_cnt = 1; |
|
985 break; |
|
986 |
|
987 case 28: |
|
988 /* 0 28 callothersubr pop */ |
|
989 /* => push random value from interval [0, 1) onto stack */ |
|
990 if ( arg_cnt != 0 ) |
|
991 goto Unexpected_OtherSubr; |
|
992 |
|
993 { |
|
994 FT_Fixed Rand; |
|
995 |
|
996 |
|
997 Rand = seed; |
|
998 if ( Rand >= 0x8000L ) |
|
999 Rand++; |
|
1000 |
|
1001 top[0] = Rand; |
|
1002 |
|
1003 seed = FT_MulFix( seed, 0x10000L - seed ); |
|
1004 if ( seed == 0 ) |
|
1005 seed += 0x2873; |
|
1006 } |
|
1007 |
|
1008 known_othersubr_result_cnt = 1; |
|
1009 break; |
|
1010 |
|
1011 default: |
|
1012 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1013 " unknown othersubr [%d %d], wish me luck\n", |
|
1014 arg_cnt, subr_no )); |
|
1015 unknown_othersubr_result_cnt = arg_cnt; |
|
1016 break; |
|
1017 |
|
1018 Unexpected_OtherSubr: |
|
1019 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1020 " invalid othersubr [%d %d]\n", arg_cnt, subr_no )); |
|
1021 goto Syntax_Error; |
|
1022 } |
|
1023 |
|
1024 top += known_othersubr_result_cnt; |
|
1025 |
|
1026 decoder->top = top; |
|
1027 } |
|
1028 else /* general operator */ |
|
1029 { |
|
1030 FT_Int num_args = t1_args_count[op]; |
|
1031 |
|
1032 |
|
1033 FT_ASSERT( num_args >= 0 ); |
|
1034 |
|
1035 if ( top - decoder->stack < num_args ) |
|
1036 goto Stack_Underflow; |
|
1037 |
|
1038 /* XXX Operators usually take their operands from the */ |
|
1039 /* bottom of the stack, i.e., the operands are */ |
|
1040 /* decoder->stack[0], ..., decoder->stack[num_args - 1]; */ |
|
1041 /* only div, callsubr, and callothersubr are different. */ |
|
1042 /* In practice it doesn't matter (?). */ |
|
1043 |
|
1044 #ifdef FT_DEBUG_LEVEL_TRACE |
|
1045 |
|
1046 switch ( op ) |
|
1047 { |
|
1048 case op_callsubr: |
|
1049 case op_div: |
|
1050 case op_callothersubr: |
|
1051 case op_pop: |
|
1052 case op_return: |
|
1053 break; |
|
1054 |
|
1055 default: |
|
1056 if ( top - decoder->stack != num_args ) |
|
1057 FT_TRACE0(( "t1_decoder_parse_charstrings:" |
|
1058 " too much operands on the stack" |
|
1059 " (seen %d, expected %d)\n", |
|
1060 top - decoder->stack, num_args )); |
|
1061 break; |
|
1062 } |
|
1063 |
|
1064 #endif /* FT_DEBUG_LEVEL_TRACE */ |
|
1065 |
|
1066 top -= num_args; |
|
1067 |
|
1068 switch ( op ) |
|
1069 { |
|
1070 case op_endchar: |
|
1071 FT_TRACE4(( " endchar\n" )); |
|
1072 |
|
1073 t1_builder_close_contour( builder ); |
|
1074 |
|
1075 /* close hints recording session */ |
|
1076 if ( hinter ) |
|
1077 { |
|
1078 if ( hinter->close( hinter->hints, builder->current->n_points ) ) |
|
1079 goto Syntax_Error; |
|
1080 |
|
1081 /* apply hints to the loaded glyph outline now */ |
|
1082 hinter->apply( hinter->hints, |
|
1083 builder->current, |
|
1084 (PSH_Globals)builder->hints_globals, |
|
1085 decoder->hint_mode ); |
|
1086 } |
|
1087 |
|
1088 /* add current outline to the glyph slot */ |
|
1089 FT_GlyphLoader_Add( builder->loader ); |
|
1090 |
|
1091 /* the compiler should optimize away this empty loop but ... */ |
|
1092 |
|
1093 #ifdef FT_DEBUG_LEVEL_TRACE |
|
1094 |
|
1095 if ( decoder->len_buildchar > 0 ) |
|
1096 { |
|
1097 FT_UInt i; |
|
1098 |
|
1099 |
|
1100 FT_TRACE4(( "BuildCharArray = [ " )); |
|
1101 |
|
1102 for ( i = 0; i < decoder->len_buildchar; ++i ) |
|
1103 FT_TRACE4(( "%d ", decoder->buildchar[ i ] )); |
|
1104 |
|
1105 FT_TRACE4(( "]\n" )); |
|
1106 } |
|
1107 |
|
1108 #endif /* FT_DEBUG_LEVEL_TRACE */ |
|
1109 |
|
1110 FT_TRACE4(( "\n" )); |
|
1111 |
|
1112 /* return now! */ |
|
1113 return PSaux_Err_Ok; |
|
1114 |
|
1115 case op_hsbw: |
|
1116 FT_TRACE4(( " hsbw" )); |
|
1117 |
|
1118 builder->parse_state = T1_Parse_Have_Width; |
|
1119 |
|
1120 builder->left_bearing.x += top[0]; |
|
1121 builder->advance.x = top[1]; |
|
1122 builder->advance.y = 0; |
|
1123 |
|
1124 orig_x = x = builder->pos_x + top[0]; |
|
1125 orig_y = y = builder->pos_y; |
|
1126 |
|
1127 FT_UNUSED( orig_y ); |
|
1128 |
|
1129 /* the `metrics_only' indicates that we only want to compute */ |
|
1130 /* the glyph's metrics (lsb + advance width), not load the */ |
|
1131 /* rest of it; so exit immediately */ |
|
1132 if ( builder->metrics_only ) |
|
1133 return PSaux_Err_Ok; |
|
1134 |
|
1135 break; |
|
1136 |
|
1137 case op_seac: |
|
1138 return t1operator_seac( decoder, |
|
1139 top[0], |
|
1140 top[1], |
|
1141 top[2], |
|
1142 (FT_Int)( top[3] >> 16 ), |
|
1143 (FT_Int)( top[4] >> 16 ) ); |
|
1144 |
|
1145 case op_sbw: |
|
1146 FT_TRACE4(( " sbw" )); |
|
1147 |
|
1148 builder->parse_state = T1_Parse_Have_Width; |
|
1149 |
|
1150 builder->left_bearing.x += top[0]; |
|
1151 builder->left_bearing.y += top[1]; |
|
1152 builder->advance.x = top[2]; |
|
1153 builder->advance.y = top[3]; |
|
1154 |
|
1155 x = builder->pos_x + top[0]; |
|
1156 y = builder->pos_y + top[1]; |
|
1157 |
|
1158 /* the `metrics_only' indicates that we only want to compute */ |
|
1159 /* the glyph's metrics (lsb + advance width), not load the */ |
|
1160 /* rest of it; so exit immediately */ |
|
1161 if ( builder->metrics_only ) |
|
1162 return PSaux_Err_Ok; |
|
1163 |
|
1164 break; |
|
1165 |
|
1166 case op_closepath: |
|
1167 FT_TRACE4(( " closepath" )); |
|
1168 |
|
1169 /* if there is no path, `closepath' is a no-op */ |
|
1170 if ( builder->parse_state == T1_Parse_Have_Path || |
|
1171 builder->parse_state == T1_Parse_Have_Moveto ) |
|
1172 t1_builder_close_contour( builder ); |
|
1173 |
|
1174 builder->parse_state = T1_Parse_Have_Width; |
|
1175 break; |
|
1176 |
|
1177 case op_hlineto: |
|
1178 FT_TRACE4(( " hlineto" )); |
|
1179 |
|
1180 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
1181 != PSaux_Err_Ok ) |
|
1182 goto Fail; |
|
1183 |
|
1184 x += top[0]; |
|
1185 goto Add_Line; |
|
1186 |
|
1187 case op_hmoveto: |
|
1188 FT_TRACE4(( " hmoveto" )); |
|
1189 |
|
1190 x += top[0]; |
|
1191 if ( !decoder->flex_state ) |
|
1192 { |
|
1193 if ( builder->parse_state == T1_Parse_Start ) |
|
1194 goto Syntax_Error; |
|
1195 builder->parse_state = T1_Parse_Have_Moveto; |
|
1196 } |
|
1197 break; |
|
1198 |
|
1199 case op_hvcurveto: |
|
1200 FT_TRACE4(( " hvcurveto" )); |
|
1201 |
|
1202 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
1203 != PSaux_Err_Ok || |
|
1204 ( error = t1_builder_check_points( builder, 3 ) ) |
|
1205 != PSaux_Err_Ok ) |
|
1206 goto Fail; |
|
1207 |
|
1208 x += top[0]; |
|
1209 t1_builder_add_point( builder, x, y, 0 ); |
|
1210 x += top[1]; |
|
1211 y += top[2]; |
|
1212 t1_builder_add_point( builder, x, y, 0 ); |
|
1213 y += top[3]; |
|
1214 t1_builder_add_point( builder, x, y, 1 ); |
|
1215 break; |
|
1216 |
|
1217 case op_rlineto: |
|
1218 FT_TRACE4(( " rlineto" )); |
|
1219 |
|
1220 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
1221 != PSaux_Err_Ok ) |
|
1222 goto Fail; |
|
1223 |
|
1224 x += top[0]; |
|
1225 y += top[1]; |
|
1226 |
|
1227 Add_Line: |
|
1228 if ( ( error = t1_builder_add_point1( builder, x, y ) ) |
|
1229 != PSaux_Err_Ok ) |
|
1230 goto Fail; |
|
1231 break; |
|
1232 |
|
1233 case op_rmoveto: |
|
1234 FT_TRACE4(( " rmoveto" )); |
|
1235 |
|
1236 x += top[0]; |
|
1237 y += top[1]; |
|
1238 if ( !decoder->flex_state ) |
|
1239 { |
|
1240 if ( builder->parse_state == T1_Parse_Start ) |
|
1241 goto Syntax_Error; |
|
1242 builder->parse_state = T1_Parse_Have_Moveto; |
|
1243 } |
|
1244 break; |
|
1245 |
|
1246 case op_rrcurveto: |
|
1247 FT_TRACE4(( " rrcurveto" )); |
|
1248 |
|
1249 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
1250 != PSaux_Err_Ok || |
|
1251 ( error = t1_builder_check_points( builder, 3 ) ) |
|
1252 != PSaux_Err_Ok ) |
|
1253 goto Fail; |
|
1254 |
|
1255 x += top[0]; |
|
1256 y += top[1]; |
|
1257 t1_builder_add_point( builder, x, y, 0 ); |
|
1258 |
|
1259 x += top[2]; |
|
1260 y += top[3]; |
|
1261 t1_builder_add_point( builder, x, y, 0 ); |
|
1262 |
|
1263 x += top[4]; |
|
1264 y += top[5]; |
|
1265 t1_builder_add_point( builder, x, y, 1 ); |
|
1266 break; |
|
1267 |
|
1268 case op_vhcurveto: |
|
1269 FT_TRACE4(( " vhcurveto" )); |
|
1270 |
|
1271 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
1272 != PSaux_Err_Ok || |
|
1273 ( error = t1_builder_check_points( builder, 3 ) ) |
|
1274 != PSaux_Err_Ok ) |
|
1275 goto Fail; |
|
1276 |
|
1277 y += top[0]; |
|
1278 t1_builder_add_point( builder, x, y, 0 ); |
|
1279 x += top[1]; |
|
1280 y += top[2]; |
|
1281 t1_builder_add_point( builder, x, y, 0 ); |
|
1282 x += top[3]; |
|
1283 t1_builder_add_point( builder, x, y, 1 ); |
|
1284 break; |
|
1285 |
|
1286 case op_vlineto: |
|
1287 FT_TRACE4(( " vlineto" )); |
|
1288 |
|
1289 if ( ( error = t1_builder_start_point( builder, x, y ) ) |
|
1290 != PSaux_Err_Ok ) |
|
1291 goto Fail; |
|
1292 |
|
1293 y += top[0]; |
|
1294 goto Add_Line; |
|
1295 |
|
1296 case op_vmoveto: |
|
1297 FT_TRACE4(( " vmoveto" )); |
|
1298 |
|
1299 y += top[0]; |
|
1300 if ( !decoder->flex_state ) |
|
1301 { |
|
1302 if ( builder->parse_state == T1_Parse_Start ) |
|
1303 goto Syntax_Error; |
|
1304 builder->parse_state = T1_Parse_Have_Moveto; |
|
1305 } |
|
1306 break; |
|
1307 |
|
1308 case op_div: |
|
1309 FT_TRACE4(( " div" )); |
|
1310 |
|
1311 /* if `large_int' is set, we divide unscaled numbers; */ |
|
1312 /* otherwise, we divide numbers in 16.16 format -- */ |
|
1313 /* in both cases, it is the same operation */ |
|
1314 *top = FT_DivFix( top[0], top[1] ); |
|
1315 ++top; |
|
1316 |
|
1317 large_int = FALSE; |
|
1318 break; |
|
1319 |
|
1320 case op_callsubr: |
|
1321 { |
|
1322 FT_Int idx; |
|
1323 |
|
1324 |
|
1325 FT_TRACE4(( " callsubr" )); |
|
1326 |
|
1327 idx = (FT_Int)( top[0] >> 16 ); |
|
1328 if ( idx < 0 || idx >= (FT_Int)decoder->num_subrs ) |
|
1329 { |
|
1330 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1331 " invalid subrs index\n" )); |
|
1332 goto Syntax_Error; |
|
1333 } |
|
1334 |
|
1335 if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS ) |
|
1336 { |
|
1337 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1338 " too many nested subrs\n" )); |
|
1339 goto Syntax_Error; |
|
1340 } |
|
1341 |
|
1342 zone->cursor = ip; /* save current instruction pointer */ |
|
1343 |
|
1344 zone++; |
|
1345 |
|
1346 /* The Type 1 driver stores subroutines without the seed bytes. */ |
|
1347 /* The CID driver stores subroutines with seed bytes. This */ |
|
1348 /* case is taken care of when decoder->subrs_len == 0. */ |
|
1349 zone->base = decoder->subrs[idx]; |
|
1350 |
|
1351 if ( decoder->subrs_len ) |
|
1352 zone->limit = zone->base + decoder->subrs_len[idx]; |
|
1353 else |
|
1354 { |
|
1355 /* We are using subroutines from a CID font. We must adjust */ |
|
1356 /* for the seed bytes. */ |
|
1357 zone->base += ( decoder->lenIV >= 0 ? decoder->lenIV : 0 ); |
|
1358 zone->limit = decoder->subrs[idx + 1]; |
|
1359 } |
|
1360 |
|
1361 zone->cursor = zone->base; |
|
1362 |
|
1363 if ( !zone->base ) |
|
1364 { |
|
1365 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1366 " invoking empty subrs\n" )); |
|
1367 goto Syntax_Error; |
|
1368 } |
|
1369 |
|
1370 decoder->zone = zone; |
|
1371 ip = zone->base; |
|
1372 limit = zone->limit; |
|
1373 break; |
|
1374 } |
|
1375 |
|
1376 case op_pop: |
|
1377 FT_TRACE4(( " pop" )); |
|
1378 |
|
1379 if ( known_othersubr_result_cnt > 0 ) |
|
1380 { |
|
1381 known_othersubr_result_cnt--; |
|
1382 /* ignore, we pushed the operands ourselves */ |
|
1383 break; |
|
1384 } |
|
1385 |
|
1386 if ( unknown_othersubr_result_cnt == 0 ) |
|
1387 { |
|
1388 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1389 " no more operands for othersubr\n" )); |
|
1390 goto Syntax_Error; |
|
1391 } |
|
1392 |
|
1393 unknown_othersubr_result_cnt--; |
|
1394 top++; /* `push' the operand to callothersubr onto the stack */ |
|
1395 break; |
|
1396 |
|
1397 case op_return: |
|
1398 FT_TRACE4(( " return" )); |
|
1399 |
|
1400 if ( zone <= decoder->zones ) |
|
1401 { |
|
1402 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1403 " unexpected return\n" )); |
|
1404 goto Syntax_Error; |
|
1405 } |
|
1406 |
|
1407 zone--; |
|
1408 ip = zone->cursor; |
|
1409 limit = zone->limit; |
|
1410 decoder->zone = zone; |
|
1411 break; |
|
1412 |
|
1413 case op_dotsection: |
|
1414 FT_TRACE4(( " dotsection" )); |
|
1415 |
|
1416 break; |
|
1417 |
|
1418 case op_hstem: |
|
1419 FT_TRACE4(( " hstem" )); |
|
1420 |
|
1421 /* record horizontal hint */ |
|
1422 if ( hinter ) |
|
1423 { |
|
1424 /* top[0] += builder->left_bearing.y; */ |
|
1425 hinter->stem( hinter->hints, 1, top ); |
|
1426 } |
|
1427 break; |
|
1428 |
|
1429 case op_hstem3: |
|
1430 FT_TRACE4(( " hstem3" )); |
|
1431 |
|
1432 /* record horizontal counter-controlled hints */ |
|
1433 if ( hinter ) |
|
1434 hinter->stem3( hinter->hints, 1, top ); |
|
1435 break; |
|
1436 |
|
1437 case op_vstem: |
|
1438 FT_TRACE4(( " vstem" )); |
|
1439 |
|
1440 /* record vertical hint */ |
|
1441 if ( hinter ) |
|
1442 { |
|
1443 top[0] += orig_x; |
|
1444 hinter->stem( hinter->hints, 0, top ); |
|
1445 } |
|
1446 break; |
|
1447 |
|
1448 case op_vstem3: |
|
1449 FT_TRACE4(( " vstem3" )); |
|
1450 |
|
1451 /* record vertical counter-controlled hints */ |
|
1452 if ( hinter ) |
|
1453 { |
|
1454 FT_Pos dx = orig_x; |
|
1455 |
|
1456 |
|
1457 top[0] += dx; |
|
1458 top[2] += dx; |
|
1459 top[4] += dx; |
|
1460 hinter->stem3( hinter->hints, 0, top ); |
|
1461 } |
|
1462 break; |
|
1463 |
|
1464 case op_setcurrentpoint: |
|
1465 FT_TRACE4(( " setcurrentpoint" )); |
|
1466 |
|
1467 /* From the T1 specification, section 6.4: */ |
|
1468 /* */ |
|
1469 /* The setcurrentpoint command is used only in */ |
|
1470 /* conjunction with results from OtherSubrs procedures. */ |
|
1471 |
|
1472 /* known_othersubr_result_cnt != 0 is already handled */ |
|
1473 /* above. */ |
|
1474 |
|
1475 /* Note, however, that both Ghostscript and Adobe */ |
|
1476 /* Distiller handle this situation by silently ignoring */ |
|
1477 /* the inappropriate `setcurrentpoint' instruction. So */ |
|
1478 /* we do the same. */ |
|
1479 #if 0 |
|
1480 |
|
1481 if ( decoder->flex_state != 1 ) |
|
1482 { |
|
1483 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1484 " unexpected `setcurrentpoint'\n" )); |
|
1485 goto Syntax_Error; |
|
1486 } |
|
1487 else |
|
1488 ... |
|
1489 #endif |
|
1490 |
|
1491 x = top[0]; |
|
1492 y = top[1]; |
|
1493 decoder->flex_state = 0; |
|
1494 break; |
|
1495 |
|
1496 case op_unknown15: |
|
1497 FT_TRACE4(( " opcode_15" )); |
|
1498 /* nothing to do except to pop the two arguments */ |
|
1499 break; |
|
1500 |
|
1501 default: |
|
1502 FT_ERROR(( "t1_decoder_parse_charstrings:" |
|
1503 " unhandled opcode %d\n", op )); |
|
1504 goto Syntax_Error; |
|
1505 } |
|
1506 |
|
1507 /* XXX Operators usually clear the operand stack; */ |
|
1508 /* only div, callsubr, callothersubr, pop, and */ |
|
1509 /* return are different. */ |
|
1510 /* In practice it doesn't matter (?). */ |
|
1511 |
|
1512 decoder->top = top; |
|
1513 |
|
1514 #ifdef FT_DEBUG_LEVEL_TRACE |
|
1515 FT_TRACE4(( "\n" )); |
|
1516 bol = TRUE; |
|
1517 #endif |
|
1518 |
|
1519 } /* general operator processing */ |
|
1520 |
|
1521 } /* while ip < limit */ |
|
1522 |
|
1523 FT_TRACE4(( "..end..\n\n" )); |
|
1524 |
|
1525 Fail: |
|
1526 return error; |
|
1527 |
|
1528 Syntax_Error: |
|
1529 return PSaux_Err_Syntax_Error; |
|
1530 |
|
1531 Stack_Underflow: |
|
1532 return PSaux_Err_Stack_Underflow; |
|
1533 } |
|
1534 |
|
1535 |
|
1536 /* parse a single Type 1 glyph */ |
|
1537 FT_LOCAL_DEF( FT_Error ) |
|
1538 t1_decoder_parse_glyph( T1_Decoder decoder, |
|
1539 FT_UInt glyph ) |
|
1540 { |
|
1541 return decoder->parse_callback( decoder, glyph ); |
|
1542 } |
|
1543 |
|
1544 |
|
1545 /* initialize T1 decoder */ |
|
1546 FT_LOCAL_DEF( FT_Error ) |
|
1547 t1_decoder_init( T1_Decoder decoder, |
|
1548 FT_Face face, |
|
1549 FT_Size size, |
|
1550 FT_GlyphSlot slot, |
|
1551 FT_Byte** glyph_names, |
|
1552 PS_Blend blend, |
|
1553 FT_Bool hinting, |
|
1554 FT_Render_Mode hint_mode, |
|
1555 T1_Decoder_Callback parse_callback ) |
|
1556 { |
|
1557 FT_MEM_ZERO( decoder, sizeof ( *decoder ) ); |
|
1558 |
|
1559 /* retrieve PSNames interface from list of current modules */ |
|
1560 { |
|
1561 FT_Service_PsCMaps psnames = 0; |
|
1562 |
|
1563 |
|
1564 FT_FACE_FIND_GLOBAL_SERVICE( face, psnames, POSTSCRIPT_CMAPS ); |
|
1565 if ( !psnames ) |
|
1566 { |
|
1567 FT_ERROR(( "t1_decoder_init:" |
|
1568 " the `psnames' module is not available\n" )); |
|
1569 return PSaux_Err_Unimplemented_Feature; |
|
1570 } |
|
1571 |
|
1572 decoder->psnames = psnames; |
|
1573 } |
|
1574 |
|
1575 t1_builder_init( &decoder->builder, face, size, slot, hinting ); |
|
1576 |
|
1577 /* decoder->buildchar and decoder->len_buildchar have to be */ |
|
1578 /* initialized by the caller since we cannot know the length */ |
|
1579 /* of the BuildCharArray */ |
|
1580 |
|
1581 decoder->num_glyphs = (FT_UInt)face->num_glyphs; |
|
1582 decoder->glyph_names = glyph_names; |
|
1583 decoder->hint_mode = hint_mode; |
|
1584 decoder->blend = blend; |
|
1585 decoder->parse_callback = parse_callback; |
|
1586 |
|
1587 decoder->funcs = t1_decoder_funcs; |
|
1588 |
|
1589 return PSaux_Err_Ok; |
|
1590 } |
|
1591 |
|
1592 |
|
1593 /* finalize T1 decoder */ |
|
1594 FT_LOCAL_DEF( void ) |
|
1595 t1_decoder_done( T1_Decoder decoder ) |
|
1596 { |
|
1597 t1_builder_done( &decoder->builder ); |
|
1598 } |
|
1599 |
|
1600 |
|
1601 /* END */ |
|