1 /***************************************************************************/ |
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2 /* */ |
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3 /* ttobjs.h */ |
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4 /* */ |
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5 /* Objects manager (specification). */ |
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6 /* */ |
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7 /* Copyright 1996-2009, 2011 by */ |
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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9 /* */ |
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10 /* This file is part of the FreeType project, and may only be used, */ |
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11 /* modified, and distributed under the terms of the FreeType project */ |
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 /* this file you indicate that you have read the license and */ |
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14 /* understand and accept it fully. */ |
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15 /* */ |
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16 /***************************************************************************/ |
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17 |
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18 |
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19 #ifndef __TTOBJS_H__ |
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20 #define __TTOBJS_H__ |
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21 |
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22 |
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23 #include <ft2build.h> |
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24 #include FT_INTERNAL_OBJECTS_H |
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25 #include FT_INTERNAL_TRUETYPE_TYPES_H |
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26 |
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27 |
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28 FT_BEGIN_HEADER |
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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 /* <Type> */ |
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34 /* TT_Driver */ |
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35 /* */ |
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36 /* <Description> */ |
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37 /* A handle to a TrueType driver object. */ |
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38 /* */ |
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39 typedef struct TT_DriverRec_* TT_Driver; |
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40 |
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41 |
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42 /*************************************************************************/ |
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43 /* */ |
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44 /* <Type> */ |
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45 /* TT_Instance */ |
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46 /* */ |
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47 /* <Description> */ |
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48 /* A handle to a TrueType size object. */ |
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49 /* */ |
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50 typedef struct TT_SizeRec_* TT_Size; |
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51 |
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52 |
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53 /*************************************************************************/ |
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54 /* */ |
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55 /* <Type> */ |
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56 /* TT_GlyphSlot */ |
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57 /* */ |
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58 /* <Description> */ |
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59 /* A handle to a TrueType glyph slot object. */ |
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60 /* */ |
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61 /* <Note> */ |
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62 /* This is a direct typedef of FT_GlyphSlot, as there is nothing */ |
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63 /* specific about the TrueType glyph slot. */ |
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64 /* */ |
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65 typedef FT_GlyphSlot TT_GlyphSlot; |
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66 |
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67 |
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68 /*************************************************************************/ |
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69 /* */ |
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70 /* <Struct> */ |
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71 /* TT_GraphicsState */ |
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72 /* */ |
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73 /* <Description> */ |
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74 /* The TrueType graphics state used during bytecode interpretation. */ |
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75 /* */ |
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76 typedef struct TT_GraphicsState_ |
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77 { |
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78 FT_UShort rp0; |
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79 FT_UShort rp1; |
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80 FT_UShort rp2; |
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81 |
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82 FT_UnitVector dualVector; |
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83 FT_UnitVector projVector; |
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84 FT_UnitVector freeVector; |
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85 |
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86 #ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING |
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87 FT_Bool both_x_axis; |
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88 #endif |
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89 |
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90 FT_Long loop; |
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91 FT_F26Dot6 minimum_distance; |
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92 FT_Int round_state; |
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93 |
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94 FT_Bool auto_flip; |
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95 FT_F26Dot6 control_value_cutin; |
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96 FT_F26Dot6 single_width_cutin; |
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97 FT_F26Dot6 single_width_value; |
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98 FT_Short delta_base; |
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99 FT_Short delta_shift; |
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100 |
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101 FT_Byte instruct_control; |
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102 /* According to Greg Hitchcock from Microsoft, the `scan_control' */ |
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103 /* variable as documented in the TrueType specification is a 32-bit */ |
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104 /* integer; the high-word part holds the SCANTYPE value, the low-word */ |
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105 /* part the SCANCTRL value. We separate it into two fields. */ |
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106 FT_Bool scan_control; |
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107 FT_Int scan_type; |
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108 |
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109 FT_UShort gep0; |
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110 FT_UShort gep1; |
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111 FT_UShort gep2; |
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112 |
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113 } TT_GraphicsState; |
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114 |
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115 |
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116 #ifdef TT_USE_BYTECODE_INTERPRETER |
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117 |
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118 FT_LOCAL( void ) |
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119 tt_glyphzone_done( TT_GlyphZone zone ); |
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120 |
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121 FT_LOCAL( FT_Error ) |
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122 tt_glyphzone_new( FT_Memory memory, |
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123 FT_UShort maxPoints, |
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124 FT_Short maxContours, |
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125 TT_GlyphZone zone ); |
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126 |
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127 #endif /* TT_USE_BYTECODE_INTERPRETER */ |
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128 |
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129 |
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130 |
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131 /*************************************************************************/ |
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132 /* */ |
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133 /* EXECUTION SUBTABLES */ |
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134 /* */ |
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135 /* These sub-tables relate to instruction execution. */ |
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136 /* */ |
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137 /*************************************************************************/ |
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138 |
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139 |
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140 #define TT_MAX_CODE_RANGES 3 |
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141 |
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142 |
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143 /*************************************************************************/ |
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144 /* */ |
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145 /* There can only be 3 active code ranges at once: */ |
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146 /* - the Font Program */ |
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147 /* - the CVT Program */ |
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148 /* - a glyph's instructions set */ |
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149 /* */ |
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150 typedef enum TT_CodeRange_Tag_ |
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151 { |
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152 tt_coderange_none = 0, |
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153 tt_coderange_font, |
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154 tt_coderange_cvt, |
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155 tt_coderange_glyph |
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156 |
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157 } TT_CodeRange_Tag; |
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158 |
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159 |
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160 typedef struct TT_CodeRange_ |
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161 { |
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162 FT_Byte* base; |
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163 FT_ULong size; |
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164 |
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165 } TT_CodeRange; |
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166 |
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167 typedef TT_CodeRange TT_CodeRangeTable[TT_MAX_CODE_RANGES]; |
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168 |
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169 |
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170 /*************************************************************************/ |
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171 /* */ |
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172 /* Defines a function/instruction definition record. */ |
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173 /* */ |
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174 typedef struct TT_DefRecord_ |
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175 { |
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176 FT_Int range; /* in which code range is it located? */ |
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177 FT_Long start; /* where does it start? */ |
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178 FT_UInt opc; /* function #, or instruction code */ |
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179 FT_Bool active; /* is it active? */ |
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180 |
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181 } TT_DefRecord, *TT_DefArray; |
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182 |
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183 |
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184 /*************************************************************************/ |
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185 /* */ |
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186 /* Subglyph transformation record. */ |
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187 /* */ |
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188 typedef struct TT_Transform_ |
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189 { |
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190 FT_Fixed xx, xy; /* transformation matrix coefficients */ |
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191 FT_Fixed yx, yy; |
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192 FT_F26Dot6 ox, oy; /* offsets */ |
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193 |
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194 } TT_Transform; |
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195 |
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196 |
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197 /*************************************************************************/ |
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198 /* */ |
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199 /* A note regarding non-squared pixels: */ |
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200 /* */ |
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201 /* (This text will probably go into some docs at some time; for now, it */ |
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202 /* is kept here to explain some definitions in the TT_Size_Metrics */ |
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203 /* record). */ |
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204 /* */ |
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205 /* The CVT is a one-dimensional array containing values that control */ |
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206 /* certain important characteristics in a font, like the height of all */ |
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207 /* capitals, all lowercase letter, default spacing or stem width/height. */ |
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208 /* */ |
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209 /* These values are found in FUnits in the font file, and must be scaled */ |
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210 /* to pixel coordinates before being used by the CVT and glyph programs. */ |
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211 /* Unfortunately, when using distinct x and y resolutions (or distinct x */ |
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212 /* and y pointsizes), there are two possible scalings. */ |
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213 /* */ |
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214 /* A first try was to implement a `lazy' scheme where all values were */ |
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215 /* scaled when first used. However, while some values are always used */ |
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216 /* in the same direction, some others are used under many different */ |
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217 /* circumstances and orientations. */ |
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218 /* */ |
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219 /* I have found a simpler way to do the same, and it even seems to work */ |
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220 /* in most of the cases: */ |
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221 /* */ |
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222 /* - All CVT values are scaled to the maximum ppem size. */ |
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223 /* */ |
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224 /* - When performing a read or write in the CVT, a ratio factor is used */ |
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225 /* to perform adequate scaling. Example: */ |
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226 /* */ |
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227 /* x_ppem = 14 */ |
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228 /* y_ppem = 10 */ |
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229 /* */ |
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230 /* We choose ppem = x_ppem = 14 as the CVT scaling size. All cvt */ |
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231 /* entries are scaled to it. */ |
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232 /* */ |
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233 /* x_ratio = 1.0 */ |
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234 /* y_ratio = y_ppem/ppem (< 1.0) */ |
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235 /* */ |
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236 /* We compute the current ratio like: */ |
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237 /* */ |
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238 /* - If projVector is horizontal, */ |
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239 /* ratio = x_ratio = 1.0 */ |
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240 /* */ |
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241 /* - if projVector is vertical, */ |
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242 /* ratio = y_ratio */ |
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243 /* */ |
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244 /* - else, */ |
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245 /* ratio = sqrt( (proj.x * x_ratio) ^ 2 + (proj.y * y_ratio) ^ 2 ) */ |
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246 /* */ |
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247 /* Reading a cvt value returns */ |
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248 /* ratio * cvt[index] */ |
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249 /* */ |
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250 /* Writing a cvt value in pixels: */ |
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251 /* cvt[index] / ratio */ |
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252 /* */ |
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253 /* The current ppem is simply */ |
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254 /* ratio * ppem */ |
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255 /* */ |
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256 /*************************************************************************/ |
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257 |
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258 |
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259 /*************************************************************************/ |
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260 /* */ |
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261 /* Metrics used by the TrueType size and context objects. */ |
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262 /* */ |
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263 typedef struct TT_Size_Metrics_ |
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264 { |
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265 /* for non-square pixels */ |
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266 FT_Long x_ratio; |
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267 FT_Long y_ratio; |
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268 |
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269 FT_UShort ppem; /* maximum ppem size */ |
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270 FT_Long ratio; /* current ratio */ |
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271 FT_Fixed scale; |
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272 |
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273 FT_F26Dot6 compensations[4]; /* device-specific compensations */ |
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274 |
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275 FT_Bool valid; |
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276 |
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277 FT_Bool rotated; /* `is the glyph rotated?'-flag */ |
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278 FT_Bool stretched; /* `is the glyph stretched?'-flag */ |
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279 |
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280 } TT_Size_Metrics; |
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281 |
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282 |
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283 /*************************************************************************/ |
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284 /* */ |
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285 /* TrueType size class. */ |
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286 /* */ |
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287 typedef struct TT_SizeRec_ |
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288 { |
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289 FT_SizeRec root; |
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290 |
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291 /* we have our own copy of metrics so that we can modify */ |
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292 /* it without affecting auto-hinting (when used) */ |
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293 FT_Size_Metrics metrics; |
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294 |
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295 TT_Size_Metrics ttmetrics; |
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296 |
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297 FT_ULong strike_index; /* 0xFFFFFFFF to indicate invalid */ |
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298 |
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299 #ifdef TT_USE_BYTECODE_INTERPRETER |
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300 |
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301 FT_UInt num_function_defs; /* number of function definitions */ |
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302 FT_UInt max_function_defs; |
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303 TT_DefArray function_defs; /* table of function definitions */ |
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304 |
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305 FT_UInt num_instruction_defs; /* number of ins. definitions */ |
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306 FT_UInt max_instruction_defs; |
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307 TT_DefArray instruction_defs; /* table of ins. definitions */ |
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308 |
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309 FT_UInt max_func; |
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310 FT_UInt max_ins; |
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311 |
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312 TT_CodeRangeTable codeRangeTable; |
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313 |
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314 TT_GraphicsState GS; |
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315 |
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316 FT_ULong cvt_size; /* the scaled control value table */ |
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317 FT_Long* cvt; |
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318 |
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319 FT_UShort storage_size; /* The storage area is now part of */ |
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320 FT_Long* storage; /* the instance */ |
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321 |
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322 TT_GlyphZoneRec twilight; /* The instance's twilight zone */ |
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323 |
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324 /* debugging variables */ |
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325 |
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326 /* When using the debugger, we must keep the */ |
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327 /* execution context tied to the instance */ |
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328 /* object rather than asking it on demand. */ |
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329 |
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330 FT_Bool debug; |
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331 TT_ExecContext context; |
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332 |
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333 FT_Bool bytecode_ready; |
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334 FT_Bool cvt_ready; |
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335 |
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336 #endif /* TT_USE_BYTECODE_INTERPRETER */ |
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337 |
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338 } TT_SizeRec; |
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339 |
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340 |
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341 /*************************************************************************/ |
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342 /* */ |
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343 /* TrueType driver class. */ |
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344 /* */ |
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345 typedef struct TT_DriverRec_ |
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346 { |
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347 FT_DriverRec root; |
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348 TT_ExecContext context; /* execution context */ |
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349 TT_GlyphZoneRec zone; /* glyph loader points zone */ |
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350 |
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351 void* extension_component; |
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352 |
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353 } TT_DriverRec; |
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354 |
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355 |
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356 /* Note: All of the functions below (except tt_size_reset()) are used */ |
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357 /* as function pointers in a FT_Driver_ClassRec. Therefore their */ |
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358 /* parameters are of types FT_Face, FT_Size, etc., rather than TT_Face, */ |
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359 /* TT_Size, etc., so that the compiler can confirm that the types and */ |
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360 /* number of parameters are correct. In all cases the FT_xxx types are */ |
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361 /* cast to their TT_xxx counterparts inside the functions since FreeType */ |
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362 /* will always use the TT driver to create them. */ |
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363 |
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364 |
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365 /*************************************************************************/ |
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366 /* */ |
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367 /* Face functions */ |
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368 /* */ |
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369 FT_LOCAL( FT_Error ) |
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370 tt_face_init( FT_Stream stream, |
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371 FT_Face ttface, /* TT_Face */ |
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372 FT_Int face_index, |
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373 FT_Int num_params, |
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374 FT_Parameter* params ); |
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375 |
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376 FT_LOCAL( void ) |
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377 tt_face_done( FT_Face ttface ); /* TT_Face */ |
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378 |
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379 |
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380 /*************************************************************************/ |
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381 /* */ |
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382 /* Size functions */ |
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383 /* */ |
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384 FT_LOCAL( FT_Error ) |
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385 tt_size_init( FT_Size ttsize ); /* TT_Size */ |
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386 |
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387 FT_LOCAL( void ) |
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388 tt_size_done( FT_Size ttsize ); /* TT_Size */ |
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389 |
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390 #ifdef TT_USE_BYTECODE_INTERPRETER |
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391 |
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392 FT_LOCAL( FT_Error ) |
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393 tt_size_run_fpgm( TT_Size size, |
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394 FT_Bool pedantic ); |
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395 |
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396 FT_LOCAL( FT_Error ) |
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397 tt_size_run_prep( TT_Size size, |
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398 FT_Bool pedantic ); |
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399 |
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400 FT_LOCAL( FT_Error ) |
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401 tt_size_ready_bytecode( TT_Size size, |
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402 FT_Bool pedantic ); |
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403 |
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404 #endif /* TT_USE_BYTECODE_INTERPRETER */ |
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405 |
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406 FT_LOCAL( FT_Error ) |
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407 tt_size_reset( TT_Size size ); |
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408 |
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409 |
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410 /*************************************************************************/ |
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411 /* */ |
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412 /* Driver functions */ |
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413 /* */ |
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414 FT_LOCAL( FT_Error ) |
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415 tt_driver_init( FT_Module ttdriver ); /* TT_Driver */ |
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416 |
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417 FT_LOCAL( void ) |
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418 tt_driver_done( FT_Module ttdriver ); /* TT_Driver */ |
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419 |
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420 |
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421 /*************************************************************************/ |
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422 /* */ |
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423 /* Slot functions */ |
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424 /* */ |
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425 FT_LOCAL( FT_Error ) |
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426 tt_slot_init( FT_GlyphSlot slot ); |
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427 |
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428 |
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429 FT_END_HEADER |
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430 |
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431 #endif /* __TTOBJS_H__ */ |
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432 |
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433 |
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434 /* END */ |
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