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1 /***************************************************************************/ |
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2 /* */ |
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3 /* pfrsbit.c */ |
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4 /* */ |
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5 /* FreeType PFR bitmap loader (body). */ |
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6 /* */ |
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7 /* Copyright 2002, 2003, 2006, 2009, 2010 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 #include "pfrsbit.h" |
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20 #include "pfrload.h" |
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21 #include FT_INTERNAL_DEBUG_H |
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22 #include FT_INTERNAL_STREAM_H |
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23 |
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24 #include "pfrerror.h" |
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25 |
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26 #undef FT_COMPONENT |
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27 #define FT_COMPONENT trace_pfr |
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28 |
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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 /***** PFR BIT WRITER *****/ |
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34 /***** *****/ |
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35 /*************************************************************************/ |
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36 /*************************************************************************/ |
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37 |
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38 typedef struct PFR_BitWriter_ |
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39 { |
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40 FT_Byte* line; /* current line start */ |
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41 FT_Int pitch; /* line size in bytes */ |
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42 FT_Int width; /* width in pixels/bits */ |
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43 FT_Int rows; /* number of remaining rows to scan */ |
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44 FT_Int total; /* total number of bits to draw */ |
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45 |
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46 } PFR_BitWriterRec, *PFR_BitWriter; |
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47 |
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48 |
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49 static void |
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50 pfr_bitwriter_init( PFR_BitWriter writer, |
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51 FT_Bitmap* target, |
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52 FT_Bool decreasing ) |
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53 { |
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54 writer->line = target->buffer; |
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55 writer->pitch = target->pitch; |
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56 writer->width = target->width; |
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57 writer->rows = target->rows; |
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58 writer->total = writer->width * writer->rows; |
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59 |
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60 if ( !decreasing ) |
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61 { |
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62 writer->line += writer->pitch * ( target->rows-1 ); |
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63 writer->pitch = -writer->pitch; |
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64 } |
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65 } |
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66 |
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67 |
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68 static void |
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69 pfr_bitwriter_decode_bytes( PFR_BitWriter writer, |
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70 FT_Byte* p, |
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71 FT_Byte* limit ) |
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72 { |
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73 FT_Int n, reload; |
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74 FT_Int left = writer->width; |
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75 FT_Byte* cur = writer->line; |
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76 FT_UInt mask = 0x80; |
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77 FT_UInt val = 0; |
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78 FT_UInt c = 0; |
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79 |
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80 |
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81 n = (FT_Int)( limit - p ) * 8; |
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82 if ( n > writer->total ) |
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83 n = writer->total; |
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84 |
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85 reload = n & 7; |
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86 |
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87 for ( ; n > 0; n-- ) |
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88 { |
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89 if ( ( n & 7 ) == reload ) |
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90 val = *p++; |
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91 |
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92 if ( val & 0x80 ) |
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93 c |= mask; |
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94 |
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95 val <<= 1; |
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96 mask >>= 1; |
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97 |
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98 if ( --left <= 0 ) |
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99 { |
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100 cur[0] = (FT_Byte)c; |
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101 left = writer->width; |
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102 mask = 0x80; |
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103 |
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104 writer->line += writer->pitch; |
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105 cur = writer->line; |
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106 c = 0; |
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107 } |
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108 else if ( mask == 0 ) |
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109 { |
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110 cur[0] = (FT_Byte)c; |
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111 mask = 0x80; |
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112 c = 0; |
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113 cur ++; |
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114 } |
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115 } |
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116 |
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117 if ( mask != 0x80 ) |
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118 cur[0] = (FT_Byte)c; |
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119 } |
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120 |
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121 |
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122 static void |
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123 pfr_bitwriter_decode_rle1( PFR_BitWriter writer, |
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124 FT_Byte* p, |
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125 FT_Byte* limit ) |
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126 { |
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127 FT_Int n, phase, count, counts[2], reload; |
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128 FT_Int left = writer->width; |
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129 FT_Byte* cur = writer->line; |
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130 FT_UInt mask = 0x80; |
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131 FT_UInt c = 0; |
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132 |
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133 |
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134 n = writer->total; |
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135 |
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136 phase = 1; |
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137 counts[0] = 0; |
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138 counts[1] = 0; |
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139 count = 0; |
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140 reload = 1; |
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141 |
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142 for ( ; n > 0; n-- ) |
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143 { |
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144 if ( reload ) |
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145 { |
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146 do |
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147 { |
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148 if ( phase ) |
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149 { |
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150 FT_Int v; |
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151 |
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152 |
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153 if ( p >= limit ) |
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154 break; |
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155 |
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156 v = *p++; |
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157 counts[0] = v >> 4; |
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158 counts[1] = v & 15; |
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159 phase = 0; |
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160 count = counts[0]; |
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161 } |
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162 else |
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163 { |
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164 phase = 1; |
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165 count = counts[1]; |
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166 } |
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167 |
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168 } while ( count == 0 ); |
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169 } |
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170 |
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171 if ( phase ) |
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172 c |= mask; |
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173 |
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174 mask >>= 1; |
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175 |
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176 if ( --left <= 0 ) |
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177 { |
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178 cur[0] = (FT_Byte) c; |
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179 left = writer->width; |
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180 mask = 0x80; |
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181 |
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182 writer->line += writer->pitch; |
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183 cur = writer->line; |
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184 c = 0; |
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185 } |
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186 else if ( mask == 0 ) |
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187 { |
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188 cur[0] = (FT_Byte)c; |
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189 mask = 0x80; |
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190 c = 0; |
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191 cur ++; |
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192 } |
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193 |
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194 reload = ( --count <= 0 ); |
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195 } |
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196 |
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197 if ( mask != 0x80 ) |
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198 cur[0] = (FT_Byte) c; |
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199 } |
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200 |
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201 |
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202 static void |
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203 pfr_bitwriter_decode_rle2( PFR_BitWriter writer, |
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204 FT_Byte* p, |
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205 FT_Byte* limit ) |
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206 { |
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207 FT_Int n, phase, count, reload; |
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208 FT_Int left = writer->width; |
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209 FT_Byte* cur = writer->line; |
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210 FT_UInt mask = 0x80; |
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211 FT_UInt c = 0; |
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212 |
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213 |
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214 n = writer->total; |
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215 |
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216 phase = 1; |
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217 count = 0; |
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218 reload = 1; |
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219 |
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220 for ( ; n > 0; n-- ) |
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221 { |
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222 if ( reload ) |
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223 { |
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224 do |
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225 { |
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226 if ( p >= limit ) |
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227 break; |
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228 |
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229 count = *p++; |
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230 phase = phase ^ 1; |
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231 |
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232 } while ( count == 0 ); |
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233 } |
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234 |
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235 if ( phase ) |
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236 c |= mask; |
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237 |
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238 mask >>= 1; |
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239 |
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240 if ( --left <= 0 ) |
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241 { |
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242 cur[0] = (FT_Byte) c; |
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243 c = 0; |
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244 mask = 0x80; |
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245 left = writer->width; |
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246 |
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247 writer->line += writer->pitch; |
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248 cur = writer->line; |
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249 } |
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250 else if ( mask == 0 ) |
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251 { |
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252 cur[0] = (FT_Byte)c; |
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253 c = 0; |
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254 mask = 0x80; |
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255 cur ++; |
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256 } |
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257 |
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258 reload = ( --count <= 0 ); |
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259 } |
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260 |
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261 if ( mask != 0x80 ) |
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262 cur[0] = (FT_Byte) c; |
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263 } |
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264 |
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265 |
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266 /*************************************************************************/ |
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267 /*************************************************************************/ |
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268 /***** *****/ |
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269 /***** BITMAP DATA DECODING *****/ |
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270 /***** *****/ |
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271 /*************************************************************************/ |
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272 /*************************************************************************/ |
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273 |
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274 static void |
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275 pfr_lookup_bitmap_data( FT_Byte* base, |
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276 FT_Byte* limit, |
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277 FT_UInt count, |
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278 FT_UInt flags, |
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279 FT_UInt char_code, |
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280 FT_ULong* found_offset, |
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281 FT_ULong* found_size ) |
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282 { |
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283 FT_UInt left, right, char_len; |
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284 FT_Bool two = FT_BOOL( flags & 1 ); |
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285 FT_Byte* buff; |
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286 |
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287 |
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288 char_len = 4; |
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289 if ( two ) char_len += 1; |
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290 if ( flags & 2 ) char_len += 1; |
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291 if ( flags & 4 ) char_len += 1; |
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292 |
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293 left = 0; |
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294 right = count; |
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295 |
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296 while ( left < right ) |
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297 { |
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298 FT_UInt middle, code; |
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299 |
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300 |
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301 middle = ( left + right ) >> 1; |
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302 buff = base + middle * char_len; |
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303 |
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304 /* check that we are not outside of the table -- */ |
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305 /* this is possible with broken fonts... */ |
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306 if ( buff + char_len > limit ) |
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307 goto Fail; |
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308 |
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309 if ( two ) |
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310 code = PFR_NEXT_USHORT( buff ); |
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311 else |
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312 code = PFR_NEXT_BYTE( buff ); |
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313 |
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314 if ( code == char_code ) |
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315 goto Found_It; |
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316 |
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317 if ( code < char_code ) |
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318 left = middle; |
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319 else |
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320 right = middle; |
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321 } |
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322 |
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323 Fail: |
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324 /* Not found */ |
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325 *found_size = 0; |
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326 *found_offset = 0; |
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327 return; |
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328 |
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329 Found_It: |
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330 if ( flags & 2 ) |
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331 *found_size = PFR_NEXT_USHORT( buff ); |
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332 else |
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333 *found_size = PFR_NEXT_BYTE( buff ); |
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334 |
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335 if ( flags & 4 ) |
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336 *found_offset = PFR_NEXT_ULONG( buff ); |
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337 else |
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338 *found_offset = PFR_NEXT_USHORT( buff ); |
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339 } |
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340 |
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341 |
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342 /* load bitmap metrics. "*padvance" must be set to the default value */ |
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343 /* before calling this function... */ |
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344 /* */ |
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345 static FT_Error |
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346 pfr_load_bitmap_metrics( FT_Byte** pdata, |
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347 FT_Byte* limit, |
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348 FT_Long scaled_advance, |
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349 FT_Long *axpos, |
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350 FT_Long *aypos, |
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351 FT_UInt *axsize, |
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352 FT_UInt *aysize, |
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353 FT_Long *aadvance, |
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354 FT_UInt *aformat ) |
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355 { |
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356 FT_Error error = PFR_Err_Ok; |
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357 FT_Byte flags; |
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358 FT_Char b; |
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359 FT_Byte* p = *pdata; |
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360 FT_Long xpos, ypos, advance; |
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361 FT_UInt xsize, ysize; |
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362 |
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363 |
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364 PFR_CHECK( 1 ); |
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365 flags = PFR_NEXT_BYTE( p ); |
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366 |
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367 xpos = 0; |
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368 ypos = 0; |
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369 xsize = 0; |
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370 ysize = 0; |
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371 advance = 0; |
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372 |
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373 switch ( flags & 3 ) |
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374 { |
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375 case 0: |
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376 PFR_CHECK( 1 ); |
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377 b = PFR_NEXT_INT8( p ); |
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378 xpos = b >> 4; |
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379 ypos = ( (FT_Char)( b << 4 ) ) >> 4; |
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380 break; |
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381 |
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382 case 1: |
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383 PFR_CHECK( 2 ); |
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384 xpos = PFR_NEXT_INT8( p ); |
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385 ypos = PFR_NEXT_INT8( p ); |
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386 break; |
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387 |
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388 case 2: |
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389 PFR_CHECK( 4 ); |
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390 xpos = PFR_NEXT_SHORT( p ); |
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391 ypos = PFR_NEXT_SHORT( p ); |
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392 break; |
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393 |
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394 case 3: |
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395 PFR_CHECK( 6 ); |
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396 xpos = PFR_NEXT_LONG( p ); |
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397 ypos = PFR_NEXT_LONG( p ); |
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398 break; |
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399 |
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400 default: |
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401 ; |
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402 } |
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403 |
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404 flags >>= 2; |
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405 switch ( flags & 3 ) |
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406 { |
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407 case 0: |
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408 /* blank image */ |
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409 xsize = 0; |
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410 ysize = 0; |
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411 break; |
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412 |
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413 case 1: |
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414 PFR_CHECK( 1 ); |
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415 b = PFR_NEXT_BYTE( p ); |
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416 xsize = ( b >> 4 ) & 0xF; |
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417 ysize = b & 0xF; |
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418 break; |
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419 |
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420 case 2: |
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421 PFR_CHECK( 2 ); |
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422 xsize = PFR_NEXT_BYTE( p ); |
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423 ysize = PFR_NEXT_BYTE( p ); |
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424 break; |
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425 |
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426 case 3: |
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427 PFR_CHECK( 4 ); |
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428 xsize = PFR_NEXT_USHORT( p ); |
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429 ysize = PFR_NEXT_USHORT( p ); |
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430 break; |
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431 |
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432 default: |
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433 ; |
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434 } |
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435 |
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436 flags >>= 2; |
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437 switch ( flags & 3 ) |
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438 { |
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439 case 0: |
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440 advance = scaled_advance; |
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441 break; |
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442 |
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443 case 1: |
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444 PFR_CHECK( 1 ); |
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445 advance = PFR_NEXT_INT8( p ) << 8; |
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446 break; |
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447 |
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448 case 2: |
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449 PFR_CHECK( 2 ); |
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450 advance = PFR_NEXT_SHORT( p ); |
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451 break; |
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452 |
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453 case 3: |
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454 PFR_CHECK( 3 ); |
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455 advance = PFR_NEXT_LONG( p ); |
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456 break; |
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457 |
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458 default: |
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459 ; |
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460 } |
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461 |
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462 *axpos = xpos; |
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463 *aypos = ypos; |
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464 *axsize = xsize; |
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465 *aysize = ysize; |
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466 *aadvance = advance; |
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467 *aformat = flags >> 2; |
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468 *pdata = p; |
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469 |
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470 Exit: |
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471 return error; |
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472 |
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473 Too_Short: |
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474 error = PFR_Err_Invalid_Table; |
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475 FT_ERROR(( "pfr_load_bitmap_metrics: invalid glyph data\n" )); |
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476 goto Exit; |
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477 } |
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478 |
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479 |
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480 static FT_Error |
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481 pfr_load_bitmap_bits( FT_Byte* p, |
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482 FT_Byte* limit, |
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483 FT_UInt format, |
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484 FT_Bool decreasing, |
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485 FT_Bitmap* target ) |
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486 { |
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487 FT_Error error = PFR_Err_Ok; |
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488 PFR_BitWriterRec writer; |
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489 |
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490 |
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491 if ( target->rows > 0 && target->width > 0 ) |
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492 { |
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493 pfr_bitwriter_init( &writer, target, decreasing ); |
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494 |
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495 switch ( format ) |
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496 { |
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497 case 0: /* packed bits */ |
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498 pfr_bitwriter_decode_bytes( &writer, p, limit ); |
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499 break; |
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500 |
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501 case 1: /* RLE1 */ |
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502 pfr_bitwriter_decode_rle1( &writer, p, limit ); |
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503 break; |
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504 |
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505 case 2: /* RLE2 */ |
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506 pfr_bitwriter_decode_rle2( &writer, p, limit ); |
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507 break; |
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508 |
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509 default: |
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510 FT_ERROR(( "pfr_read_bitmap_data: invalid image type\n" )); |
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511 error = PFR_Err_Invalid_File_Format; |
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512 } |
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513 } |
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514 |
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515 return error; |
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516 } |
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517 |
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518 |
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519 /*************************************************************************/ |
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520 /*************************************************************************/ |
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521 /***** *****/ |
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522 /***** BITMAP LOADING *****/ |
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523 /***** *****/ |
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524 /*************************************************************************/ |
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525 /*************************************************************************/ |
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526 |
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527 FT_LOCAL( FT_Error ) |
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528 pfr_slot_load_bitmap( PFR_Slot glyph, |
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529 PFR_Size size, |
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530 FT_UInt glyph_index ) |
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531 { |
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532 FT_Error error; |
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533 PFR_Face face = (PFR_Face) glyph->root.face; |
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534 FT_Stream stream = face->root.stream; |
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535 PFR_PhyFont phys = &face->phy_font; |
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536 FT_ULong gps_offset; |
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537 FT_ULong gps_size; |
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538 PFR_Char character; |
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539 PFR_Strike strike; |
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540 |
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541 |
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542 character = &phys->chars[glyph_index]; |
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543 |
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544 /* Look-up a bitmap strike corresponding to the current */ |
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545 /* character dimensions */ |
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546 { |
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547 FT_UInt n; |
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548 |
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549 |
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550 strike = phys->strikes; |
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551 for ( n = 0; n < phys->num_strikes; n++ ) |
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552 { |
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553 if ( strike->x_ppm == (FT_UInt)size->root.metrics.x_ppem && |
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554 strike->y_ppm == (FT_UInt)size->root.metrics.y_ppem ) |
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555 { |
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556 goto Found_Strike; |
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557 } |
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558 |
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559 strike++; |
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560 } |
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561 |
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562 /* couldn't find it */ |
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563 return PFR_Err_Invalid_Argument; |
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564 } |
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565 |
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566 Found_Strike: |
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567 |
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568 /* Now lookup the glyph's position within the file */ |
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569 { |
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570 FT_UInt char_len; |
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571 |
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572 |
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573 char_len = 4; |
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574 if ( strike->flags & 1 ) char_len += 1; |
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575 if ( strike->flags & 2 ) char_len += 1; |
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576 if ( strike->flags & 4 ) char_len += 1; |
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577 |
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578 /* Access data directly in the frame to speed lookups */ |
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579 if ( FT_STREAM_SEEK( phys->bct_offset + strike->bct_offset ) || |
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580 FT_FRAME_ENTER( char_len * strike->num_bitmaps ) ) |
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581 goto Exit; |
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582 |
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583 pfr_lookup_bitmap_data( stream->cursor, |
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584 stream->limit, |
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585 strike->num_bitmaps, |
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586 strike->flags, |
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587 character->char_code, |
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588 &gps_offset, |
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589 &gps_size ); |
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590 |
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591 FT_FRAME_EXIT(); |
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592 |
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593 if ( gps_size == 0 ) |
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594 { |
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595 /* Could not find a bitmap program string for this glyph */ |
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596 error = PFR_Err_Invalid_Argument; |
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597 goto Exit; |
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598 } |
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599 } |
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600 |
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601 /* get the bitmap metrics */ |
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602 { |
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603 FT_Long xpos = 0, ypos = 0, advance = 0; |
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604 FT_UInt xsize = 0, ysize = 0, format = 0; |
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605 FT_Byte* p; |
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606 |
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607 |
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608 /* compute linear advance */ |
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609 advance = character->advance; |
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610 if ( phys->metrics_resolution != phys->outline_resolution ) |
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611 advance = FT_MulDiv( advance, |
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612 phys->outline_resolution, |
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613 phys->metrics_resolution ); |
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614 |
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615 glyph->root.linearHoriAdvance = advance; |
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616 |
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617 /* compute default advance, i.e., scaled advance. This can be */ |
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618 /* overridden in the bitmap header of certain glyphs. */ |
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619 advance = FT_MulDiv( (FT_Fixed)size->root.metrics.x_ppem << 8, |
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620 character->advance, |
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621 phys->metrics_resolution ); |
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622 |
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623 if ( FT_STREAM_SEEK( face->header.gps_section_offset + gps_offset ) || |
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624 FT_FRAME_ENTER( gps_size ) ) |
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625 goto Exit; |
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626 |
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627 p = stream->cursor; |
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628 error = pfr_load_bitmap_metrics( &p, stream->limit, |
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629 advance, |
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630 &xpos, &ypos, |
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631 &xsize, &ysize, |
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632 &advance, &format ); |
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633 |
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634 /* |
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635 * XXX: on 16bit system, we return an error for huge bitmap |
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636 * which causes a size truncation, because truncated |
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637 * size properties makes bitmap glyph broken. |
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638 */ |
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639 if ( xpos > FT_INT_MAX || ( ypos + ysize ) > FT_INT_MAX ) |
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640 { |
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641 FT_TRACE1(( "pfr_slot_load_bitmap:" )); |
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642 FT_TRACE1(( "huge bitmap glyph %dx%d over FT_GlyphSlot\n", |
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643 xpos, ypos )); |
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644 error = PFR_Err_Invalid_Pixel_Size; |
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645 } |
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646 |
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647 if ( !error ) |
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648 { |
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649 glyph->root.format = FT_GLYPH_FORMAT_BITMAP; |
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650 |
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651 /* Set up glyph bitmap and metrics */ |
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652 |
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653 /* XXX: needs casts to fit FT_Bitmap.{width|rows|pitch} */ |
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654 glyph->root.bitmap.width = (FT_Int)xsize; |
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655 glyph->root.bitmap.rows = (FT_Int)ysize; |
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656 glyph->root.bitmap.pitch = (FT_Int)( xsize + 7 ) >> 3; |
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657 glyph->root.bitmap.pixel_mode = FT_PIXEL_MODE_MONO; |
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658 |
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659 /* XXX: needs casts to fit FT_Glyph_Metrics.{width|height} */ |
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660 glyph->root.metrics.width = (FT_Pos)xsize << 6; |
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661 glyph->root.metrics.height = (FT_Pos)ysize << 6; |
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662 glyph->root.metrics.horiBearingX = xpos << 6; |
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663 glyph->root.metrics.horiBearingY = ypos << 6; |
|
664 glyph->root.metrics.horiAdvance = FT_PIX_ROUND( ( advance >> 2 ) ); |
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665 glyph->root.metrics.vertBearingX = - glyph->root.metrics.width >> 1; |
|
666 glyph->root.metrics.vertBearingY = 0; |
|
667 glyph->root.metrics.vertAdvance = size->root.metrics.height; |
|
668 |
|
669 /* XXX: needs casts fit FT_GlyphSlotRec.bitmap_{left|top} */ |
|
670 glyph->root.bitmap_left = (FT_Int)xpos; |
|
671 glyph->root.bitmap_top = (FT_Int)(ypos + ysize); |
|
672 |
|
673 /* Allocate and read bitmap data */ |
|
674 { |
|
675 FT_ULong len = glyph->root.bitmap.pitch * ysize; |
|
676 |
|
677 |
|
678 error = ft_glyphslot_alloc_bitmap( &glyph->root, len ); |
|
679 if ( !error ) |
|
680 { |
|
681 error = pfr_load_bitmap_bits( |
|
682 p, |
|
683 stream->limit, |
|
684 format, |
|
685 FT_BOOL(face->header.color_flags & 2), |
|
686 &glyph->root.bitmap ); |
|
687 } |
|
688 } |
|
689 } |
|
690 |
|
691 FT_FRAME_EXIT(); |
|
692 } |
|
693 |
|
694 Exit: |
|
695 return error; |
|
696 } |
|
697 |
|
698 /* END */ |