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5172
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/***************************************************************************/
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/* */
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/* ttsbit.c */
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/* */
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/* TrueType and OpenType embedded bitmap support (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */
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/* 2010 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_TAGS_H
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23 |
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24 |
/*
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25 |
* Alas, the memory-optimized sbit loader can't be used when implementing
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26 |
* the `old internals' hack
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27 |
*/
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28 |
#ifndef FT_CONFIG_OPTION_OLD_INTERNALS
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#include "ttsbit0.c"
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#else /* FT_CONFIG_OPTION_OLD_INTERNALS */
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34 |
#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_TAGS_H
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#include "ttsbit.h"
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#include "sferrors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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48 |
/* */
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49 |
#undef FT_COMPONENT
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50 |
#define FT_COMPONENT trace_ttsbit
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52 |
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53 |
/*************************************************************************/
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54 |
/* */
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/* <Function> */
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56 |
/* blit_sbit */
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57 |
/* */
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/* <Description> */
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/* Blits a bitmap from an input stream into a given target. Supports */
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/* x and y offsets as well as byte padded lines. */
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/* */
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/* <Input> */
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/* target :: The target bitmap/pixmap. */
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/* */
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/* source :: The input packed bitmap data. */
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66 |
/* */
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/* line_bits :: The number of bits per line. */
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68 |
/* */
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/* byte_padded :: A flag which is true if lines are byte-padded. */
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/* */
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/* x_offset :: The horizontal offset. */
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/* */
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/* y_offset :: The vertical offset. */
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/* */
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/* <Note> */
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/* IMPORTANT: The x and y offsets are relative to the top corner of */
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/* the target bitmap (unlike the normal TrueType */
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/* convention). A positive y offset indicates a downwards */
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/* direction! */
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/* */
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81 |
static void
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82 |
blit_sbit( FT_Bitmap* target,
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83 |
FT_Byte* source,
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84 |
FT_Int line_bits,
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85 |
FT_Bool byte_padded,
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86 |
FT_Int x_offset,
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87 |
FT_Int y_offset,
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88 |
FT_Int source_height )
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89 |
{
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90 |
FT_Byte* line_buff;
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91 |
FT_Int line_incr;
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92 |
FT_Int height;
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93 |
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94 |
FT_UShort acc;
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FT_UInt loaded;
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96 |
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97 |
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98 |
/* first of all, compute starting write position */
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99 |
line_incr = target->pitch;
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100 |
line_buff = target->buffer;
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101 |
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102 |
if ( line_incr < 0 )
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103 |
line_buff -= line_incr * ( target->rows - 1 );
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104 |
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105 |
line_buff += ( x_offset >> 3 ) + y_offset * line_incr;
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106 |
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107 |
/***********************************************************************/
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108 |
/* */
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109 |
/* We use the extra-classic `accumulator' trick to extract the bits */
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110 |
/* from the source byte stream. */
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111 |
/* */
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112 |
/* Namely, the variable `acc' is a 16-bit accumulator containing the */
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113 |
/* last `loaded' bits from the input stream. The bits are shifted to */
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/* the upmost position in `acc'. */
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115 |
/* */
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116 |
/***********************************************************************/
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117 |
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118 |
acc = 0; /* clear accumulator */
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119 |
loaded = 0; /* no bits were loaded */
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120 |
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121 |
for ( height = source_height; height > 0; height-- )
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122 |
{
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123 |
FT_Byte* cur = line_buff; /* current write cursor */
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124 |
FT_Int count = line_bits; /* # of bits to extract per line */
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125 |
FT_Byte shift = (FT_Byte)( x_offset & 7 ); /* current write shift */
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126 |
FT_Byte space = (FT_Byte)( 8 - shift );
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127 |
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128 |
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129 |
/* first of all, read individual source bytes */
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130 |
if ( count >= 8 )
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131 |
{
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132 |
count -= 8;
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133 |
{
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134 |
do
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135 |
{
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136 |
FT_Byte val;
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137 |
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138 |
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139 |
/* ensure that there are at least 8 bits in the accumulator */
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140 |
if ( loaded < 8 )
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141 |
{
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142 |
acc |= (FT_UShort)((FT_UShort)*source++ << ( 8 - loaded ));
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143 |
loaded += 8;
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144 |
}
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145 |
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146 |
/* now write one byte */
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147 |
val = (FT_Byte)( acc >> 8 );
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148 |
if ( shift )
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149 |
{
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150 |
cur[0] |= (FT_Byte)( val >> shift );
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151 |
cur[1] |= (FT_Byte)( val << space );
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152 |
}
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153 |
else
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154 |
cur[0] |= val;
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155 |
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156 |
cur++;
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157 |
acc <<= 8; /* remove bits from accumulator */
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158 |
loaded -= 8;
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159 |
count -= 8;
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160 |
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161 |
} while ( count >= 0 );
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162 |
}
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163 |
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164 |
/* restore `count' to correct value */
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165 |
count += 8;
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166 |
}
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167 |
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168 |
/* now write remaining bits (count < 8) */
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169 |
if ( count > 0 )
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170 |
{
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171 |
FT_Byte val;
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172 |
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173 |
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174 |
/* ensure that there are at least `count' bits in the accumulator */
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175 |
if ( (FT_Int)loaded < count )
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176 |
{
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177 |
acc |= (FT_UShort)((FT_UShort)*source++ << ( 8 - loaded ));
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178 |
loaded += 8;
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179 |
}
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180 |
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181 |
/* now write remaining bits */
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182 |
val = (FT_Byte)( ( (FT_Byte)( acc >> 8 ) ) & ~( 0xFF >> count ) );
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183 |
cur[0] |= (FT_Byte)( val >> shift );
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184 |
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185 |
if ( count > space )
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186 |
cur[1] |= (FT_Byte)( val << space );
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187 |
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188 |
acc <<= count;
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189 |
loaded -= count;
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190 |
}
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191 |
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192 |
/* now, skip to next line */
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193 |
if ( byte_padded )
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194 |
{
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195 |
acc = 0;
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196 |
loaded = 0; /* clear accumulator on byte-padded lines */
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197 |
}
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198 |
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199 |
line_buff += line_incr;
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200 |
}
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201 |
}
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202 |
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203 |
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204 |
static const FT_Frame_Field sbit_metrics_fields[] =
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205 |
{
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206 |
#undef FT_STRUCTURE
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207 |
#define FT_STRUCTURE TT_SBit_MetricsRec
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208 |
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209 |
FT_FRAME_START( 8 ),
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210 |
FT_FRAME_BYTE( height ),
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211 |
FT_FRAME_BYTE( width ),
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212 |
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213 |
FT_FRAME_CHAR( horiBearingX ),
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214 |
FT_FRAME_CHAR( horiBearingY ),
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215 |
FT_FRAME_BYTE( horiAdvance ),
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216 |
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217 |
FT_FRAME_CHAR( vertBearingX ),
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218 |
FT_FRAME_CHAR( vertBearingY ),
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219 |
FT_FRAME_BYTE( vertAdvance ),
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220 |
FT_FRAME_END
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221 |
};
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222 |
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223 |
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224 |
/*************************************************************************/
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225 |
/* */
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226 |
/* <Function> */
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227 |
/* Load_SBit_Const_Metrics */
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228 |
/* */
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229 |
/* <Description> */
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230 |
/* Loads the metrics for `EBLC' index tables format 2 and 5. */
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231 |
/* */
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232 |
/* <Input> */
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233 |
/* range :: The target range. */
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234 |
/* */
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235 |
/* stream :: The input stream. */
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236 |
/* */
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237 |
/* <Return> */
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238 |
/* FreeType error code. 0 means success. */
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239 |
/* */
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240 |
static FT_Error
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241 |
Load_SBit_Const_Metrics( TT_SBit_Range range,
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242 |
FT_Stream stream )
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|
243 |
{
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244 |
FT_Error error;
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245 |
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246 |
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247 |
if ( FT_READ_ULONG( range->image_size ) )
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248 |
return error;
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249 |
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250 |
return FT_STREAM_READ_FIELDS( sbit_metrics_fields, &range->metrics );
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251 |
}
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252 |
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253 |
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254 |
/*************************************************************************/
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255 |
/* */
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256 |
/* <Function> */
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257 |
/* Load_SBit_Range_Codes */
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258 |
/* */
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259 |
/* <Description> */
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260 |
/* Loads the range codes for `EBLC' index tables format 4 and 5. */
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261 |
/* */
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262 |
/* <Input> */
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263 |
/* range :: The target range. */
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264 |
/* */
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265 |
/* stream :: The input stream. */
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266 |
/* */
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267 |
/* load_offsets :: A flag whether to load the glyph offset table. */
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268 |
/* */
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269 |
/* <Return> */
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|
270 |
/* FreeType error code. 0 means success. */
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271 |
/* */
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|
272 |
static FT_Error
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273 |
Load_SBit_Range_Codes( TT_SBit_Range range,
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|
274 |
FT_Stream stream,
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|
275 |
FT_Bool load_offsets )
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|
276 |
{
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|
277 |
FT_Error error;
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|
278 |
FT_ULong count, n, size;
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|
279 |
FT_Memory memory = stream->memory;
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|
280 |
|
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|
281 |
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|
282 |
if ( FT_READ_ULONG( count ) )
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|
283 |
goto Exit;
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284 |
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|
285 |
range->num_glyphs = count;
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|
286 |
|
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|
287 |
/* Allocate glyph offsets table if needed */
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|
288 |
if ( load_offsets )
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|
289 |
{
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|
|
290 |
if ( FT_NEW_ARRAY( range->glyph_offsets, count ) )
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|
291 |
goto Exit;
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|
292 |
|
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|
293 |
size = count * 4L;
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|
294 |
}
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|
295 |
else
|
|
|
296 |
size = count * 2L;
|
|
|
297 |
|
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|
298 |
/* Allocate glyph codes table and access frame */
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|
299 |
if ( FT_NEW_ARRAY ( range->glyph_codes, count ) ||
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|
300 |
FT_FRAME_ENTER( size ) )
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|
301 |
goto Exit;
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302 |
|
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|
303 |
for ( n = 0; n < count; n++ )
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|
304 |
{
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|
305 |
range->glyph_codes[n] = FT_GET_USHORT();
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306 |
|
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|
307 |
if ( load_offsets )
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|
308 |
range->glyph_offsets[n] = (FT_ULong)range->image_offset +
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|
309 |
FT_GET_USHORT();
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|
310 |
}
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|
311 |
|
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|
312 |
FT_FRAME_EXIT();
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|
313 |
|
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|
314 |
Exit:
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|
315 |
return error;
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|
|
316 |
}
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|
317 |
|
|
|
318 |
|
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|
319 |
/*************************************************************************/
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|
320 |
/* */
|
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|
321 |
/* <Function> */
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|
322 |
/* Load_SBit_Range */
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|
323 |
/* */
|
|
|
324 |
/* <Description> */
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|
325 |
/* Loads a given `EBLC' index/range table. */
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|
326 |
/* */
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|
327 |
/* <Input> */
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|
328 |
/* range :: The target range. */
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|
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329 |
/* */
|
|
|
330 |
/* stream :: The input stream. */
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331 |
/* */
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|
332 |
/* <Return> */
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|
333 |
/* FreeType error code. 0 means success. */
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|
334 |
/* */
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|
335 |
static FT_Error
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|
|
336 |
Load_SBit_Range( TT_SBit_Range range,
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|
337 |
FT_Stream stream )
|
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|
338 |
{
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|
339 |
FT_Error error;
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|
340 |
FT_Memory memory = stream->memory;
|
|
|
341 |
|
|
|
342 |
|
|
|
343 |
switch( range->index_format )
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|
|
344 |
{
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|
|
345 |
case 1: /* variable metrics with 4-byte offsets */
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|
|
346 |
case 3: /* variable metrics with 2-byte offsets */
|
|
|
347 |
{
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|
|
348 |
FT_ULong num_glyphs, n;
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|
|
349 |
FT_Int size_elem;
|
|
|
350 |
FT_Bool large = FT_BOOL( range->index_format == 1 );
|
|
|
351 |
|
|
|
352 |
|
|
|
353 |
|
|
|
354 |
if ( range->last_glyph < range->first_glyph )
|
|
|
355 |
{
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|
|
356 |
error = SFNT_Err_Invalid_File_Format;
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|
|
357 |
goto Exit;
|
|
|
358 |
}
|
|
|
359 |
|
|
|
360 |
num_glyphs = range->last_glyph - range->first_glyph + 1L;
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|
|
361 |
range->num_glyphs = num_glyphs;
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|
|
362 |
num_glyphs++; /* XXX: BEWARE - see spec */
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|
|
363 |
|
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|
364 |
size_elem = large ? 4 : 2;
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|
365 |
|
|
|
366 |
if ( FT_NEW_ARRAY( range->glyph_offsets, num_glyphs ) ||
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|
|
367 |
FT_FRAME_ENTER( num_glyphs * size_elem ) )
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|
|
368 |
goto Exit;
|
|
|
369 |
|
|
|
370 |
for ( n = 0; n < num_glyphs; n++ )
|
|
|
371 |
range->glyph_offsets[n] = (FT_ULong)( range->image_offset +
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|
|
372 |
( large ? FT_GET_ULONG()
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|
373 |
: FT_GET_USHORT() ) );
|
|
|
374 |
FT_FRAME_EXIT();
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|
|
375 |
}
|
|
|
376 |
break;
|
|
|
377 |
|
|
|
378 |
case 2: /* all glyphs have identical metrics */
|
|
|
379 |
error = Load_SBit_Const_Metrics( range, stream );
|
|
|
380 |
break;
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|
|
381 |
|
|
|
382 |
case 4:
|
|
|
383 |
error = Load_SBit_Range_Codes( range, stream, 1 );
|
|
|
384 |
break;
|
|
|
385 |
|
|
|
386 |
case 5:
|
|
|
387 |
error = Load_SBit_Const_Metrics( range, stream );
|
|
|
388 |
if ( !error )
|
|
|
389 |
error = Load_SBit_Range_Codes( range, stream, 0 );
|
|
|
390 |
break;
|
|
|
391 |
|
|
|
392 |
default:
|
|
|
393 |
error = SFNT_Err_Invalid_File_Format;
|
|
|
394 |
}
|
|
|
395 |
|
|
|
396 |
Exit:
|
|
|
397 |
return error;
|
|
|
398 |
}
|
|
|
399 |
|
|
|
400 |
|
|
|
401 |
/*************************************************************************/
|
|
|
402 |
/* */
|
|
|
403 |
/* <Function> */
|
|
|
404 |
/* tt_face_load_eblc */
|
|
|
405 |
/* */
|
|
|
406 |
/* <Description> */
|
|
|
407 |
/* Loads the table of embedded bitmap sizes for this face. */
|
|
|
408 |
/* */
|
|
|
409 |
/* <Input> */
|
|
|
410 |
/* face :: The target face object. */
|
|
|
411 |
/* */
|
|
|
412 |
/* stream :: The input stream. */
|
|
|
413 |
/* */
|
|
|
414 |
/* <Return> */
|
|
|
415 |
/* FreeType error code. 0 means success. */
|
|
|
416 |
/* */
|
|
|
417 |
FT_LOCAL_DEF( FT_Error )
|
|
|
418 |
tt_face_load_eblc( TT_Face face,
|
|
|
419 |
FT_Stream stream )
|
|
|
420 |
{
|
|
|
421 |
FT_Error error = SFNT_Err_Ok;
|
|
|
422 |
FT_Memory memory = stream->memory;
|
|
|
423 |
FT_Fixed version;
|
|
|
424 |
FT_ULong num_strikes;
|
|
|
425 |
FT_ULong table_base;
|
|
|
426 |
|
|
|
427 |
static const FT_Frame_Field sbit_line_metrics_fields[] =
|
|
|
428 |
{
|
|
|
429 |
#undef FT_STRUCTURE
|
|
|
430 |
#define FT_STRUCTURE TT_SBit_LineMetricsRec
|
|
|
431 |
|
|
|
432 |
/* no FT_FRAME_START */
|
|
|
433 |
FT_FRAME_CHAR( ascender ),
|
|
|
434 |
FT_FRAME_CHAR( descender ),
|
|
|
435 |
FT_FRAME_BYTE( max_width ),
|
|
|
436 |
|
|
|
437 |
FT_FRAME_CHAR( caret_slope_numerator ),
|
|
|
438 |
FT_FRAME_CHAR( caret_slope_denominator ),
|
|
|
439 |
FT_FRAME_CHAR( caret_offset ),
|
|
|
440 |
|
|
|
441 |
FT_FRAME_CHAR( min_origin_SB ),
|
|
|
442 |
FT_FRAME_CHAR( min_advance_SB ),
|
|
|
443 |
FT_FRAME_CHAR( max_before_BL ),
|
|
|
444 |
FT_FRAME_CHAR( min_after_BL ),
|
|
|
445 |
FT_FRAME_CHAR( pads[0] ),
|
|
|
446 |
FT_FRAME_CHAR( pads[1] ),
|
|
|
447 |
FT_FRAME_END
|
|
|
448 |
};
|
|
|
449 |
|
|
|
450 |
static const FT_Frame_Field strike_start_fields[] =
|
|
|
451 |
{
|
|
|
452 |
#undef FT_STRUCTURE
|
|
|
453 |
#define FT_STRUCTURE TT_SBit_StrikeRec
|
|
|
454 |
|
|
|
455 |
/* no FT_FRAME_START */
|
|
|
456 |
FT_FRAME_ULONG( ranges_offset ),
|
|
|
457 |
FT_FRAME_SKIP_LONG,
|
|
|
458 |
FT_FRAME_ULONG( num_ranges ),
|
|
|
459 |
FT_FRAME_ULONG( color_ref ),
|
|
|
460 |
FT_FRAME_END
|
|
|
461 |
};
|
|
|
462 |
|
|
|
463 |
static const FT_Frame_Field strike_end_fields[] =
|
|
|
464 |
{
|
|
|
465 |
/* no FT_FRAME_START */
|
|
|
466 |
FT_FRAME_USHORT( start_glyph ),
|
|
|
467 |
FT_FRAME_USHORT( end_glyph ),
|
|
|
468 |
FT_FRAME_BYTE ( x_ppem ),
|
|
|
469 |
FT_FRAME_BYTE ( y_ppem ),
|
|
|
470 |
FT_FRAME_BYTE ( bit_depth ),
|
|
|
471 |
FT_FRAME_CHAR ( flags ),
|
|
|
472 |
FT_FRAME_END
|
|
|
473 |
};
|
|
|
474 |
|
|
|
475 |
|
|
|
476 |
face->num_sbit_strikes = 0;
|
|
|
477 |
|
|
|
478 |
/* this table is optional */
|
|
|
479 |
error = face->goto_table( face, TTAG_EBLC, stream, 0 );
|
|
|
480 |
if ( error )
|
|
|
481 |
error = face->goto_table( face, TTAG_bloc, stream, 0 );
|
|
|
482 |
if ( error )
|
|
|
483 |
goto Exit;
|
|
|
484 |
|
|
|
485 |
table_base = FT_STREAM_POS();
|
|
|
486 |
if ( FT_FRAME_ENTER( 8L ) )
|
|
|
487 |
goto Exit;
|
|
|
488 |
|
|
|
489 |
version = FT_GET_LONG();
|
|
|
490 |
num_strikes = FT_GET_ULONG();
|
|
|
491 |
|
|
|
492 |
FT_FRAME_EXIT();
|
|
|
493 |
|
|
|
494 |
/* check version number and strike count */
|
|
|
495 |
if ( version != 0x00020000L ||
|
|
|
496 |
num_strikes >= 0x10000L )
|
|
|
497 |
{
|
|
|
498 |
FT_ERROR(( "tt_face_load_sbit_strikes: invalid table version\n" ));
|
|
|
499 |
error = SFNT_Err_Invalid_File_Format;
|
|
|
500 |
|
|
|
501 |
goto Exit;
|
|
|
502 |
}
|
|
|
503 |
|
|
|
504 |
/* allocate the strikes table */
|
|
|
505 |
if ( FT_NEW_ARRAY( face->sbit_strikes, num_strikes ) )
|
|
|
506 |
goto Exit;
|
|
|
507 |
|
|
|
508 |
face->num_sbit_strikes = num_strikes;
|
|
|
509 |
|
|
|
510 |
/* now read each strike table separately */
|
|
|
511 |
{
|
|
|
512 |
TT_SBit_Strike strike = face->sbit_strikes;
|
|
|
513 |
FT_ULong count = num_strikes;
|
|
|
514 |
|
|
|
515 |
|
|
|
516 |
if ( FT_FRAME_ENTER( 48L * num_strikes ) )
|
|
|
517 |
goto Exit;
|
|
|
518 |
|
|
|
519 |
while ( count > 0 )
|
|
|
520 |
{
|
|
|
521 |
if ( FT_STREAM_READ_FIELDS( strike_start_fields, strike ) ||
|
|
|
522 |
FT_STREAM_READ_FIELDS( sbit_line_metrics_fields, &strike->hori ) ||
|
|
|
523 |
FT_STREAM_READ_FIELDS( sbit_line_metrics_fields, &strike->vert ) ||
|
|
|
524 |
FT_STREAM_READ_FIELDS( strike_end_fields, strike ) )
|
|
|
525 |
break;
|
|
|
526 |
|
|
|
527 |
count--;
|
|
|
528 |
strike++;
|
|
|
529 |
}
|
|
|
530 |
|
|
|
531 |
FT_FRAME_EXIT();
|
|
|
532 |
}
|
|
|
533 |
|
|
|
534 |
/* allocate the index ranges for each strike table */
|
|
|
535 |
{
|
|
|
536 |
TT_SBit_Strike strike = face->sbit_strikes;
|
|
|
537 |
FT_ULong count = num_strikes;
|
|
|
538 |
|
|
|
539 |
|
|
|
540 |
while ( count > 0 )
|
|
|
541 |
{
|
|
|
542 |
TT_SBit_Range range;
|
|
|
543 |
FT_ULong count2 = strike->num_ranges;
|
|
|
544 |
|
|
|
545 |
|
|
|
546 |
/* read each range */
|
|
|
547 |
if ( FT_STREAM_SEEK( table_base + strike->ranges_offset ) ||
|
|
|
548 |
FT_FRAME_ENTER( strike->num_ranges * 8L ) )
|
|
|
549 |
goto Exit;
|
|
|
550 |
|
|
|
551 |
if ( FT_NEW_ARRAY( strike->sbit_ranges, strike->num_ranges ) )
|
|
|
552 |
goto Exit;
|
|
|
553 |
|
|
|
554 |
range = strike->sbit_ranges;
|
|
|
555 |
while ( count2 > 0 )
|
|
|
556 |
{
|
|
|
557 |
range->first_glyph = FT_GET_USHORT();
|
|
|
558 |
range->last_glyph = FT_GET_USHORT();
|
|
|
559 |
range->table_offset = table_base + strike->ranges_offset +
|
|
|
560 |
FT_GET_ULONG();
|
|
|
561 |
count2--;
|
|
|
562 |
range++;
|
|
|
563 |
}
|
|
|
564 |
|
|
|
565 |
FT_FRAME_EXIT();
|
|
|
566 |
|
|
|
567 |
/* Now, read each index table */
|
|
|
568 |
count2 = strike->num_ranges;
|
|
|
569 |
range = strike->sbit_ranges;
|
|
|
570 |
while ( count2 > 0 )
|
|
|
571 |
{
|
|
|
572 |
/* Read the header */
|
|
|
573 |
if ( FT_STREAM_SEEK( range->table_offset ) ||
|
|
|
574 |
FT_FRAME_ENTER( 8L ) )
|
|
|
575 |
goto Exit;
|
|
|
576 |
|
|
|
577 |
range->index_format = FT_GET_USHORT();
|
|
|
578 |
range->image_format = FT_GET_USHORT();
|
|
|
579 |
range->image_offset = FT_GET_ULONG();
|
|
|
580 |
|
|
|
581 |
FT_FRAME_EXIT();
|
|
|
582 |
|
|
|
583 |
error = Load_SBit_Range( range, stream );
|
|
|
584 |
if ( error )
|
|
|
585 |
goto Exit;
|
|
|
586 |
|
|
|
587 |
count2--;
|
|
|
588 |
range++;
|
|
|
589 |
}
|
|
|
590 |
|
|
|
591 |
count--;
|
|
|
592 |
strike++;
|
|
|
593 |
}
|
|
|
594 |
}
|
|
|
595 |
|
|
|
596 |
Exit:
|
|
|
597 |
return error;
|
|
|
598 |
}
|
|
|
599 |
|
|
|
600 |
|
|
|
601 |
/*************************************************************************/
|
|
|
602 |
/* */
|
|
|
603 |
/* <Function> */
|
|
|
604 |
/* tt_face_free_eblc */
|
|
|
605 |
/* */
|
|
|
606 |
/* <Description> */
|
|
|
607 |
/* Releases the embedded bitmap tables. */
|
|
|
608 |
/* */
|
|
|
609 |
/* <Input> */
|
|
|
610 |
/* face :: The target face object. */
|
|
|
611 |
/* */
|
|
|
612 |
FT_LOCAL_DEF( void )
|
|
|
613 |
tt_face_free_eblc( TT_Face face )
|
|
|
614 |
{
|
|
|
615 |
FT_Memory memory = face->root.memory;
|
|
|
616 |
TT_SBit_Strike strike = face->sbit_strikes;
|
|
|
617 |
TT_SBit_Strike strike_limit = strike + face->num_sbit_strikes;
|
|
|
618 |
|
|
|
619 |
|
|
|
620 |
if ( strike )
|
|
|
621 |
{
|
|
|
622 |
for ( ; strike < strike_limit; strike++ )
|
|
|
623 |
{
|
|
|
624 |
TT_SBit_Range range = strike->sbit_ranges;
|
|
|
625 |
TT_SBit_Range range_limit = range + strike->num_ranges;
|
|
|
626 |
|
|
|
627 |
|
|
|
628 |
if ( range )
|
|
|
629 |
{
|
|
|
630 |
for ( ; range < range_limit; range++ )
|
|
|
631 |
{
|
|
|
632 |
/* release the glyph offsets and codes tables */
|
|
|
633 |
/* where appropriate */
|
|
|
634 |
FT_FREE( range->glyph_offsets );
|
|
|
635 |
FT_FREE( range->glyph_codes );
|
|
|
636 |
}
|
|
|
637 |
}
|
|
|
638 |
FT_FREE( strike->sbit_ranges );
|
|
|
639 |
strike->num_ranges = 0;
|
|
|
640 |
}
|
|
|
641 |
FT_FREE( face->sbit_strikes );
|
|
|
642 |
}
|
|
|
643 |
face->num_sbit_strikes = 0;
|
|
|
644 |
}
|
|
|
645 |
|
|
|
646 |
|
|
|
647 |
FT_LOCAL_DEF( FT_Error )
|
|
|
648 |
tt_face_set_sbit_strike( TT_Face face,
|
|
|
649 |
FT_Size_Request req,
|
|
|
650 |
FT_ULong* astrike_index )
|
|
|
651 |
{
|
|
|
652 |
return FT_Match_Size( (FT_Face)face, req, 0, astrike_index );
|
|
|
653 |
}
|
|
|
654 |
|
|
|
655 |
|
|
|
656 |
FT_LOCAL_DEF( FT_Error )
|
|
|
657 |
tt_face_load_strike_metrics( TT_Face face,
|
|
|
658 |
FT_ULong strike_index,
|
|
|
659 |
FT_Size_Metrics* metrics )
|
|
|
660 |
{
|
|
|
661 |
TT_SBit_Strike strike;
|
|
|
662 |
|
|
|
663 |
|
|
|
664 |
if ( strike_index >= face->num_sbit_strikes )
|
|
|
665 |
return SFNT_Err_Invalid_Argument;
|
|
|
666 |
|
|
|
667 |
strike = face->sbit_strikes + strike_index;
|
|
|
668 |
|
|
|
669 |
metrics->x_ppem = strike->x_ppem;
|
|
|
670 |
metrics->y_ppem = strike->y_ppem;
|
|
|
671 |
|
|
|
672 |
metrics->ascender = strike->hori.ascender << 6;
|
|
|
673 |
metrics->descender = strike->hori.descender << 6;
|
|
|
674 |
|
|
|
675 |
/* XXX: Is this correct? */
|
|
|
676 |
metrics->max_advance = ( strike->hori.min_origin_SB +
|
|
|
677 |
strike->hori.max_width +
|
|
|
678 |
strike->hori.min_advance_SB ) << 6;
|
|
|
679 |
|
|
|
680 |
metrics->height = metrics->ascender - metrics->descender;
|
|
|
681 |
|
|
|
682 |
return SFNT_Err_Ok;
|
|
|
683 |
}
|
|
|
684 |
|
|
|
685 |
|
|
|
686 |
/*************************************************************************/
|
|
|
687 |
/* */
|
|
|
688 |
/* <Function> */
|
|
|
689 |
/* find_sbit_range */
|
|
|
690 |
/* */
|
|
|
691 |
/* <Description> */
|
|
|
692 |
/* Scans a given strike's ranges and return, for a given glyph */
|
|
|
693 |
/* index, the corresponding sbit range, and `EBDT' offset. */
|
|
|
694 |
/* */
|
|
|
695 |
/* <Input> */
|
|
|
696 |
/* glyph_index :: The glyph index. */
|
|
|
697 |
/* */
|
|
|
698 |
/* strike :: The source/current sbit strike. */
|
|
|
699 |
/* */
|
|
|
700 |
/* <Output> */
|
|
|
701 |
/* arange :: The sbit range containing the glyph index. */
|
|
|
702 |
/* */
|
|
|
703 |
/* aglyph_offset :: The offset of the glyph data in `EBDT' table. */
|
|
|
704 |
/* */
|
|
|
705 |
/* <Return> */
|
|
|
706 |
/* FreeType error code. 0 means the glyph index was found. */
|
|
|
707 |
/* */
|
|
|
708 |
static FT_Error
|
|
|
709 |
find_sbit_range( FT_UInt glyph_index,
|
|
|
710 |
TT_SBit_Strike strike,
|
|
|
711 |
TT_SBit_Range *arange,
|
|
|
712 |
FT_ULong *aglyph_offset )
|
|
|
713 |
{
|
|
|
714 |
TT_SBit_RangeRec *range, *range_limit;
|
|
|
715 |
|
|
|
716 |
|
|
|
717 |
/* check whether the glyph index is within this strike's */
|
|
|
718 |
/* glyph range */
|
|
|
719 |
if ( glyph_index < (FT_UInt)strike->start_glyph ||
|
|
|
720 |
glyph_index > (FT_UInt)strike->end_glyph )
|
|
|
721 |
goto Fail;
|
|
|
722 |
|
|
|
723 |
/* scan all ranges in strike */
|
|
|
724 |
range = strike->sbit_ranges;
|
|
|
725 |
range_limit = range + strike->num_ranges;
|
|
|
726 |
if ( !range )
|
|
|
727 |
goto Fail;
|
|
|
728 |
|
|
|
729 |
for ( ; range < range_limit; range++ )
|
|
|
730 |
{
|
|
|
731 |
if ( glyph_index >= (FT_UInt)range->first_glyph &&
|
|
|
732 |
glyph_index <= (FT_UInt)range->last_glyph )
|
|
|
733 |
{
|
|
|
734 |
FT_UShort delta = (FT_UShort)( glyph_index - range->first_glyph );
|
|
|
735 |
|
|
|
736 |
|
|
|
737 |
switch ( range->index_format )
|
|
|
738 |
{
|
|
|
739 |
case 1:
|
|
|
740 |
case 3:
|
|
|
741 |
*aglyph_offset = range->glyph_offsets[delta];
|
|
|
742 |
break;
|
|
|
743 |
|
|
|
744 |
case 2:
|
|
|
745 |
*aglyph_offset = range->image_offset +
|
|
|
746 |
range->image_size * delta;
|
|
|
747 |
break;
|
|
|
748 |
|
|
|
749 |
case 4:
|
|
|
750 |
case 5:
|
|
|
751 |
{
|
|
|
752 |
FT_ULong n;
|
|
|
753 |
|
|
|
754 |
|
|
|
755 |
for ( n = 0; n < range->num_glyphs; n++ )
|
|
|
756 |
{
|
|
|
757 |
if ( (FT_UInt)range->glyph_codes[n] == glyph_index )
|
|
|
758 |
{
|
|
|
759 |
if ( range->index_format == 4 )
|
|
|
760 |
*aglyph_offset = range->glyph_offsets[n];
|
|
|
761 |
else
|
|
|
762 |
*aglyph_offset = range->image_offset +
|
|
|
763 |
n * range->image_size;
|
|
|
764 |
goto Found;
|
|
|
765 |
}
|
|
|
766 |
}
|
|
|
767 |
}
|
|
|
768 |
|
|
|
769 |
/* fall-through */
|
|
|
770 |
default:
|
|
|
771 |
goto Fail;
|
|
|
772 |
}
|
|
|
773 |
|
|
|
774 |
Found:
|
|
|
775 |
/* return successfully! */
|
|
|
776 |
*arange = range;
|
|
|
777 |
return SFNT_Err_Ok;
|
|
|
778 |
}
|
|
|
779 |
}
|
|
|
780 |
|
|
|
781 |
Fail:
|
|
|
782 |
*arange = 0;
|
|
|
783 |
*aglyph_offset = 0;
|
|
|
784 |
|
|
|
785 |
return SFNT_Err_Invalid_Argument;
|
|
|
786 |
}
|
|
|
787 |
|
|
|
788 |
|
|
|
789 |
/*************************************************************************/
|
|
|
790 |
/* */
|
|
|
791 |
/* <Function> */
|
|
|
792 |
/* tt_find_sbit_image */
|
|
|
793 |
/* */
|
|
|
794 |
/* <Description> */
|
|
|
795 |
/* Checks whether an embedded bitmap (an `sbit') exists for a given */
|
|
|
796 |
/* glyph, at a given strike. */
|
|
|
797 |
/* */
|
|
|
798 |
/* <Input> */
|
|
|
799 |
/* face :: The target face object. */
|
|
|
800 |
/* */
|
|
|
801 |
/* glyph_index :: The glyph index. */
|
|
|
802 |
/* */
|
|
|
803 |
/* strike_index :: The current strike index. */
|
|
|
804 |
/* */
|
|
|
805 |
/* <Output> */
|
|
|
806 |
/* arange :: The SBit range containing the glyph index. */
|
|
|
807 |
/* */
|
|
|
808 |
/* astrike :: The SBit strike containing the glyph index. */
|
|
|
809 |
/* */
|
|
|
810 |
/* aglyph_offset :: The offset of the glyph data in `EBDT' table. */
|
|
|
811 |
/* */
|
|
|
812 |
/* <Return> */
|
|
|
813 |
/* FreeType error code. 0 means success. Returns */
|
|
|
814 |
/* SFNT_Err_Invalid_Argument if no sbit exists for the requested */
|
|
|
815 |
/* glyph. */
|
|
|
816 |
/* */
|
|
|
817 |
FT_LOCAL( FT_Error )
|
|
|
818 |
tt_find_sbit_image( TT_Face face,
|
|
|
819 |
FT_UInt glyph_index,
|
|
|
820 |
FT_ULong strike_index,
|
|
|
821 |
TT_SBit_Range *arange,
|
|
|
822 |
TT_SBit_Strike *astrike,
|
|
|
823 |
FT_ULong *aglyph_offset )
|
|
|
824 |
{
|
|
|
825 |
FT_Error error;
|
|
|
826 |
TT_SBit_Strike strike;
|
|
|
827 |
|
|
|
828 |
|
|
|
829 |
if ( !face->sbit_strikes ||
|
|
|
830 |
( face->num_sbit_strikes <= strike_index ) )
|
|
|
831 |
goto Fail;
|
|
|
832 |
|
|
|
833 |
strike = &face->sbit_strikes[strike_index];
|
|
|
834 |
|
|
|
835 |
error = find_sbit_range( glyph_index, strike,
|
|
|
836 |
arange, aglyph_offset );
|
|
|
837 |
if ( error )
|
|
|
838 |
goto Fail;
|
|
|
839 |
|
|
|
840 |
*astrike = strike;
|
|
|
841 |
|
|
|
842 |
return SFNT_Err_Ok;
|
|
|
843 |
|
|
|
844 |
Fail:
|
|
|
845 |
/* no embedded bitmap for this glyph in face */
|
|
|
846 |
*arange = 0;
|
|
|
847 |
*astrike = 0;
|
|
|
848 |
*aglyph_offset = 0;
|
|
|
849 |
|
|
|
850 |
return SFNT_Err_Invalid_Argument;
|
|
|
851 |
}
|
|
|
852 |
|
|
|
853 |
|
|
|
854 |
/*************************************************************************/
|
|
|
855 |
/* */
|
|
|
856 |
/* <Function> */
|
|
|
857 |
/* tt_load_sbit_metrics */
|
|
|
858 |
/* */
|
|
|
859 |
/* <Description> */
|
|
|
860 |
/* Gets the big metrics for a given SBit. */
|
|
|
861 |
/* */
|
|
|
862 |
/* <Input> */
|
|
|
863 |
/* stream :: The input stream. */
|
|
|
864 |
/* */
|
|
|
865 |
/* range :: The SBit range containing the glyph. */
|
|
|
866 |
/* */
|
|
|
867 |
/* <Output> */
|
|
|
868 |
/* big_metrics :: A big SBit metrics structure for the glyph. */
|
|
|
869 |
/* */
|
|
|
870 |
/* <Return> */
|
|
|
871 |
/* FreeType error code. 0 means success. */
|
|
|
872 |
/* */
|
|
|
873 |
/* <Note> */
|
|
|
874 |
/* The stream cursor must be positioned at the glyph's offset within */
|
|
|
875 |
/* the `EBDT' table before the call. */
|
|
|
876 |
/* */
|
|
|
877 |
/* If the image format uses variable metrics, the stream cursor is */
|
|
|
878 |
/* positioned just after the metrics header in the `EBDT' table on */
|
|
|
879 |
/* function exit. */
|
|
|
880 |
/* */
|
|
|
881 |
FT_LOCAL( FT_Error )
|
|
|
882 |
tt_load_sbit_metrics( FT_Stream stream,
|
|
|
883 |
TT_SBit_Range range,
|
|
|
884 |
TT_SBit_Metrics metrics )
|
|
|
885 |
{
|
|
|
886 |
FT_Error error = SFNT_Err_Ok;
|
|
|
887 |
|
|
|
888 |
|
|
|
889 |
switch ( range->image_format )
|
|
|
890 |
{
|
|
|
891 |
case 1:
|
|
|
892 |
case 2:
|
|
|
893 |
case 8:
|
|
|
894 |
/* variable small metrics */
|
|
|
895 |
{
|
|
|
896 |
TT_SBit_SmallMetricsRec smetrics;
|
|
|
897 |
|
|
|
898 |
static const FT_Frame_Field sbit_small_metrics_fields[] =
|
|
|
899 |
{
|
|
|
900 |
#undef FT_STRUCTURE
|
|
|
901 |
#define FT_STRUCTURE TT_SBit_SmallMetricsRec
|
|
|
902 |
|
|
|
903 |
FT_FRAME_START( 5 ),
|
|
|
904 |
FT_FRAME_BYTE( height ),
|
|
|
905 |
FT_FRAME_BYTE( width ),
|
|
|
906 |
FT_FRAME_CHAR( bearingX ),
|
|
|
907 |
FT_FRAME_CHAR( bearingY ),
|
|
|
908 |
FT_FRAME_BYTE( advance ),
|
|
|
909 |
FT_FRAME_END
|
|
|
910 |
};
|
|
|
911 |
|
|
|
912 |
|
|
|
913 |
/* read small metrics */
|
|
|
914 |
if ( FT_STREAM_READ_FIELDS( sbit_small_metrics_fields, &smetrics ) )
|
|
|
915 |
goto Exit;
|
|
|
916 |
|
|
|
917 |
/* convert it to a big metrics */
|
|
|
918 |
metrics->height = smetrics.height;
|
|
|
919 |
metrics->width = smetrics.width;
|
|
|
920 |
metrics->horiBearingX = smetrics.bearingX;
|
|
|
921 |
metrics->horiBearingY = smetrics.bearingY;
|
|
|
922 |
metrics->horiAdvance = smetrics.advance;
|
|
|
923 |
|
|
|
924 |
/* these metrics are made up at a higher level when */
|
|
|
925 |
/* needed. */
|
|
|
926 |
metrics->vertBearingX = 0;
|
|
|
927 |
metrics->vertBearingY = 0;
|
|
|
928 |
metrics->vertAdvance = 0;
|
|
|
929 |
}
|
|
|
930 |
break;
|
|
|
931 |
|
|
|
932 |
case 6:
|
|
|
933 |
case 7:
|
|
|
934 |
case 9:
|
|
|
935 |
/* variable big metrics */
|
|
|
936 |
if ( FT_STREAM_READ_FIELDS( sbit_metrics_fields, metrics ) )
|
|
|
937 |
goto Exit;
|
|
|
938 |
break;
|
|
|
939 |
|
|
|
940 |
case 5:
|
|
|
941 |
default: /* constant metrics */
|
|
|
942 |
if ( range->index_format == 2 || range->index_format == 5 )
|
|
|
943 |
*metrics = range->metrics;
|
|
|
944 |
else
|
|
|
945 |
return SFNT_Err_Invalid_File_Format;
|
|
|
946 |
}
|
|
|
947 |
|
|
|
948 |
Exit:
|
|
|
949 |
return error;
|
|
|
950 |
}
|
|
|
951 |
|
|
|
952 |
|
|
|
953 |
/*************************************************************************/
|
|
|
954 |
/* */
|
|
|
955 |
/* <Function> */
|
|
|
956 |
/* crop_bitmap */
|
|
|
957 |
/* */
|
|
|
958 |
/* <Description> */
|
|
|
959 |
/* Crops a bitmap to its tightest bounding box, and adjusts its */
|
|
|
960 |
/* metrics. */
|
|
|
961 |
/* */
|
|
|
962 |
/* <InOut> */
|
|
|
963 |
/* map :: The bitmap. */
|
|
|
964 |
/* */
|
|
|
965 |
/* metrics :: The corresponding metrics structure. */
|
|
|
966 |
/* */
|
|
|
967 |
static void
|
|
|
968 |
crop_bitmap( FT_Bitmap* map,
|
|
|
969 |
TT_SBit_Metrics metrics )
|
|
|
970 |
{
|
|
|
971 |
/***********************************************************************/
|
|
|
972 |
/* */
|
|
|
973 |
/* In this situation, some bounding boxes of embedded bitmaps are too */
|
|
|
974 |
/* large. We need to crop it to a reasonable size. */
|
|
|
975 |
/* */
|
|
|
976 |
/* --------- */
|
|
|
977 |
/* | | ----- */
|
|
|
978 |
/* | *** | |***| */
|
|
|
979 |
/* | * | | * | */
|
|
|
980 |
/* | * | ------> | * | */
|
|
|
981 |
/* | * | | * | */
|
|
|
982 |
/* | * | | * | */
|
|
|
983 |
/* | *** | |***| */
|
|
|
984 |
/* --------- ----- */
|
|
|
985 |
/* */
|
|
|
986 |
/***********************************************************************/
|
|
|
987 |
|
|
|
988 |
FT_Int rows, count;
|
|
|
989 |
FT_Long line_len;
|
|
|
990 |
FT_Byte* line;
|
|
|
991 |
|
|
|
992 |
|
|
|
993 |
/***********************************************************************/
|
|
|
994 |
/* */
|
|
|
995 |
/* first of all, check the top-most lines of the bitmap, and remove */
|
|
|
996 |
/* them if they're empty. */
|
|
|
997 |
/* */
|
|
|
998 |
{
|
|
|
999 |
line = (FT_Byte*)map->buffer;
|
|
|
1000 |
rows = map->rows;
|
|
|
1001 |
line_len = map->pitch;
|
|
|
1002 |
|
|
|
1003 |
|
|
|
1004 |
for ( count = 0; count < rows; count++ )
|
|
|
1005 |
{
|
|
|
1006 |
FT_Byte* cur = line;
|
|
|
1007 |
FT_Byte* limit = line + line_len;
|
|
|
1008 |
|
|
|
1009 |
|
|
|
1010 |
for ( ; cur < limit; cur++ )
|
|
|
1011 |
if ( cur[0] )
|
|
|
1012 |
goto Found_Top;
|
|
|
1013 |
|
|
|
1014 |
/* the current line was empty - skip to next one */
|
|
|
1015 |
line = limit;
|
|
|
1016 |
}
|
|
|
1017 |
|
|
|
1018 |
Found_Top:
|
|
|
1019 |
/* check that we have at least one filled line */
|
|
|
1020 |
if ( count >= rows )
|
|
|
1021 |
goto Empty_Bitmap;
|
|
|
1022 |
|
|
|
1023 |
/* now, crop the empty upper lines */
|
|
|
1024 |
if ( count > 0 )
|
|
|
1025 |
{
|
|
|
1026 |
line = (FT_Byte*)map->buffer;
|
|
|
1027 |
|
|
|
1028 |
FT_MEM_MOVE( line, line + count * line_len,
|
|
|
1029 |
( rows - count ) * line_len );
|
|
|
1030 |
|
|
|
1031 |
metrics->height = (FT_Byte)( metrics->height - count );
|
|
|
1032 |
metrics->horiBearingY = (FT_Char)( metrics->horiBearingY - count );
|
|
|
1033 |
metrics->vertBearingY = (FT_Char)( metrics->vertBearingY - count );
|
|
|
1034 |
|
|
|
1035 |
map->rows -= count;
|
|
|
1036 |
rows -= count;
|
|
|
1037 |
}
|
|
|
1038 |
}
|
|
|
1039 |
|
|
|
1040 |
/***********************************************************************/
|
|
|
1041 |
/* */
|
|
|
1042 |
/* second, crop the lower lines */
|
|
|
1043 |
/* */
|
|
|
1044 |
{
|
|
|
1045 |
line = (FT_Byte*)map->buffer + ( rows - 1 ) * line_len;
|
|
|
1046 |
|
|
|
1047 |
for ( count = 0; count < rows; count++ )
|
|
|
1048 |
{
|
|
|
1049 |
FT_Byte* cur = line;
|
|
|
1050 |
FT_Byte* limit = line + line_len;
|
|
|
1051 |
|
|
|
1052 |
|
|
|
1053 |
for ( ; cur < limit; cur++ )
|
|
|
1054 |
if ( cur[0] )
|
|
|
1055 |
goto Found_Bottom;
|
|
|
1056 |
|
|
|
1057 |
/* the current line was empty - skip to previous one */
|
|
|
1058 |
line -= line_len;
|
|
|
1059 |
}
|
|
|
1060 |
|
|
|
1061 |
Found_Bottom:
|
|
|
1062 |
if ( count > 0 )
|
|
|
1063 |
{
|
|
|
1064 |
metrics->height = (FT_Byte)( metrics->height - count );
|
|
|
1065 |
rows -= count;
|
|
|
1066 |
map->rows -= count;
|
|
|
1067 |
}
|
|
|
1068 |
}
|
|
|
1069 |
|
|
|
1070 |
/***********************************************************************/
|
|
|
1071 |
/* */
|
|
|
1072 |
/* third, get rid of the space on the left side of the glyph */
|
|
|
1073 |
/* */
|
|
|
1074 |
do
|
|
|
1075 |
{
|
|
|
1076 |
FT_Byte* limit;
|
|
|
1077 |
|
|
|
1078 |
|
|
|
1079 |
line = (FT_Byte*)map->buffer;
|
|
|
1080 |
limit = line + rows * line_len;
|
|
|
1081 |
|
|
|
1082 |
for ( ; line < limit; line += line_len )
|
|
|
1083 |
if ( line[0] & 0x80 )
|
|
|
1084 |
goto Found_Left;
|
|
|
1085 |
|
|
|
1086 |
/* shift the whole glyph one pixel to the left */
|
|
|
1087 |
line = (FT_Byte*)map->buffer;
|
|
|
1088 |
limit = line + rows * line_len;
|
|
|
1089 |
|
|
|
1090 |
for ( ; line < limit; line += line_len )
|
|
|
1091 |
{
|
|
|
1092 |
FT_Int n, width = map->width;
|
|
|
1093 |
FT_Byte old;
|
|
|
1094 |
FT_Byte* cur = line;
|
|
|
1095 |
|
|
|
1096 |
|
|
|
1097 |
old = (FT_Byte)(cur[0] << 1);
|
|
|
1098 |
for ( n = 8; n < width; n += 8 )
|
|
|
1099 |
{
|
|
|
1100 |
FT_Byte val;
|
|
|
1101 |
|
|
|
1102 |
|
|
|
1103 |
val = cur[1];
|
|
|
1104 |
cur[0] = (FT_Byte)( old | ( val >> 7 ) );
|
|
|
1105 |
old = (FT_Byte)( val << 1 );
|
|
|
1106 |
cur++;
|
|
|
1107 |
}
|
|
|
1108 |
cur[0] = old;
|
|
|
1109 |
}
|
|
|
1110 |
|
|
|
1111 |
map->width--;
|
|
|
1112 |
metrics->horiBearingX++;
|
|
|
1113 |
metrics->vertBearingX++;
|
|
|
1114 |
metrics->width--;
|
|
|
1115 |
|
|
|
1116 |
} while ( map->width > 0 );
|
|
|
1117 |
|
|
|
1118 |
Found_Left:
|
|
|
1119 |
|
|
|
1120 |
/***********************************************************************/
|
|
|
1121 |
/* */
|
|
|
1122 |
/* finally, crop the bitmap width to get rid of the space on the right */
|
|
|
1123 |
/* side of the glyph. */
|
|
|
1124 |
/* */
|
|
|
1125 |
do
|
|
|
1126 |
{
|
|
|
1127 |
FT_Int right = map->width - 1;
|
|
|
1128 |
FT_Byte* limit;
|
|
|
1129 |
FT_Byte mask;
|
|
|
1130 |
|
|
|
1131 |
|
|
|
1132 |
line = (FT_Byte*)map->buffer + ( right >> 3 );
|
|
|
1133 |
limit = line + rows * line_len;
|
|
|
1134 |
mask = (FT_Byte)( 0x80 >> ( right & 7 ) );
|
|
|
1135 |
|
|
|
1136 |
for ( ; line < limit; line += line_len )
|
|
|
1137 |
if ( line[0] & mask )
|
|
|
1138 |
goto Found_Right;
|
|
|
1139 |
|
|
|
1140 |
/* crop the whole glyph to the right */
|
|
|
1141 |
map->width--;
|
|
|
1142 |
metrics->width--;
|
|
|
1143 |
|
|
|
1144 |
} while ( map->width > 0 );
|
|
|
1145 |
|
|
|
1146 |
Found_Right:
|
|
|
1147 |
/* all right, the bitmap was cropped */
|
|
|
1148 |
return;
|
|
|
1149 |
|
|
|
1150 |
Empty_Bitmap:
|
|
|
1151 |
map->width = 0;
|
|
|
1152 |
map->rows = 0;
|
|
|
1153 |
map->pitch = 0;
|
|
|
1154 |
map->pixel_mode = FT_PIXEL_MODE_MONO;
|
|
|
1155 |
}
|
|
|
1156 |
|
|
|
1157 |
|
|
|
1158 |
static FT_Error
|
|
|
1159 |
Load_SBit_Single( FT_Bitmap* map,
|
|
|
1160 |
FT_Int x_offset,
|
|
|
1161 |
FT_Int y_offset,
|
|
|
1162 |
FT_Int pix_bits,
|
|
|
1163 |
FT_UShort image_format,
|
|
|
1164 |
TT_SBit_Metrics metrics,
|
|
|
1165 |
FT_Stream stream )
|
|
|
1166 |
{
|
|
|
1167 |
FT_Error error;
|
|
|
1168 |
|
|
|
1169 |
|
|
|
1170 |
/* check that the source bitmap fits into the target pixmap */
|
|
|
1171 |
if ( x_offset < 0 || x_offset + metrics->width > map->width ||
|
|
|
1172 |
y_offset < 0 || y_offset + metrics->height > map->rows )
|
|
|
1173 |
{
|
|
|
1174 |
error = SFNT_Err_Invalid_Argument;
|
|
|
1175 |
|
|
|
1176 |
goto Exit;
|
|
|
1177 |
}
|
|
|
1178 |
|
|
|
1179 |
{
|
|
|
1180 |
FT_Int glyph_width = metrics->width;
|
|
|
1181 |
FT_Int glyph_height = metrics->height;
|
|
|
1182 |
FT_Int glyph_size;
|
|
|
1183 |
FT_Int line_bits = pix_bits * glyph_width;
|
|
|
1184 |
FT_Bool pad_bytes = 0;
|
|
|
1185 |
|
|
|
1186 |
|
|
|
1187 |
/* compute size of glyph image */
|
|
|
1188 |
switch ( image_format )
|
|
|
1189 |
{
|
|
|
1190 |
case 1: /* byte-padded formats */
|
|
|
1191 |
case 6:
|
|
|
1192 |
{
|
|
|
1193 |
FT_Int line_length;
|
|
|
1194 |
|
|
|
1195 |
|
|
|
1196 |
switch ( pix_bits )
|
|
|
1197 |
{
|
|
|
1198 |
case 1:
|
|
|
1199 |
line_length = ( glyph_width + 7 ) >> 3;
|
|
|
1200 |
break;
|
|
|
1201 |
case 2:
|
|
|
1202 |
line_length = ( glyph_width + 3 ) >> 2;
|
|
|
1203 |
break;
|
|
|
1204 |
case 4:
|
|
|
1205 |
line_length = ( glyph_width + 1 ) >> 1;
|
|
|
1206 |
break;
|
|
|
1207 |
default:
|
|
|
1208 |
line_length = glyph_width;
|
|
|
1209 |
}
|
|
|
1210 |
|
|
|
1211 |
glyph_size = glyph_height * line_length;
|
|
|
1212 |
pad_bytes = 1;
|
|
|
1213 |
}
|
|
|
1214 |
break;
|
|
|
1215 |
|
|
|
1216 |
case 2:
|
|
|
1217 |
case 5:
|
|
|
1218 |
case 7:
|
|
|
1219 |
line_bits = glyph_width * pix_bits;
|
|
|
1220 |
glyph_size = ( glyph_height * line_bits + 7 ) >> 3;
|
|
|
1221 |
break;
|
|
|
1222 |
|
|
|
1223 |
default: /* invalid format */
|
|
|
1224 |
return SFNT_Err_Invalid_File_Format;
|
|
|
1225 |
}
|
|
|
1226 |
|
|
|
1227 |
/* Now read data and draw glyph into target pixmap */
|
|
|
1228 |
if ( FT_FRAME_ENTER( glyph_size ) )
|
|
|
1229 |
goto Exit;
|
|
|
1230 |
|
|
|
1231 |
/* don't forget to multiply `x_offset' by `map->pix_bits' as */
|
|
|
1232 |
/* the sbit blitter doesn't make a difference between pixmap */
|
|
|
1233 |
/* depths. */
|
|
|
1234 |
blit_sbit( map, (FT_Byte*)stream->cursor, line_bits, pad_bytes,
|
|
|
1235 |
x_offset * pix_bits, y_offset, metrics->height );
|
|
|
1236 |
|
|
|
1237 |
FT_FRAME_EXIT();
|
|
|
1238 |
}
|
|
|
1239 |
|
|
|
1240 |
Exit:
|
|
|
1241 |
return error;
|
|
|
1242 |
}
|
|
|
1243 |
|
|
|
1244 |
|
|
|
1245 |
static FT_Error
|
|
|
1246 |
Load_SBit_Image( TT_SBit_Strike strike,
|
|
|
1247 |
TT_SBit_Range range,
|
|
|
1248 |
FT_ULong ebdt_pos,
|
|
|
1249 |
FT_ULong glyph_offset,
|
|
|
1250 |
FT_GlyphSlot slot,
|
|
|
1251 |
FT_Int x_offset,
|
|
|
1252 |
FT_Int y_offset,
|
|
|
1253 |
FT_Stream stream,
|
|
|
1254 |
TT_SBit_Metrics metrics,
|
|
|
1255 |
FT_Int depth )
|
|
|
1256 |
{
|
|
|
1257 |
FT_Memory memory = stream->memory;
|
|
|
1258 |
FT_Bitmap* map = &slot->bitmap;
|
|
|
1259 |
FT_Error error;
|
|
|
1260 |
|
|
|
1261 |
|
|
|
1262 |
/* place stream at beginning of glyph data and read metrics */
|
|
|
1263 |
if ( FT_STREAM_SEEK( ebdt_pos + glyph_offset ) )
|
|
|
1264 |
goto Exit;
|
|
|
1265 |
|
|
|
1266 |
error = tt_load_sbit_metrics( stream, range, metrics );
|
|
|
1267 |
if ( error )
|
|
|
1268 |
goto Exit;
|
|
|
1269 |
|
|
|
1270 |
/* This function is recursive. At the top-level call, we */
|
|
|
1271 |
/* compute the dimensions of the higher-level glyph to */
|
|
|
1272 |
/* allocate the final pixmap buffer. */
|
|
|
1273 |
if ( depth == 0 )
|
|
|
1274 |
{
|
|
|
1275 |
FT_Long size;
|
|
|
1276 |
|
|
|
1277 |
|
|
|
1278 |
map->width = metrics->width;
|
|
|
1279 |
map->rows = metrics->height;
|
|
|
1280 |
|
|
|
1281 |
switch ( strike->bit_depth )
|
|
|
1282 |
{
|
|
|
1283 |
case 1:
|
|
|
1284 |
map->pixel_mode = FT_PIXEL_MODE_MONO;
|
|
|
1285 |
map->pitch = ( map->width + 7 ) >> 3;
|
|
|
1286 |
break;
|
|
|
1287 |
|
|
|
1288 |
case 2:
|
|
|
1289 |
map->pixel_mode = FT_PIXEL_MODE_GRAY2;
|
|
|
1290 |
map->pitch = ( map->width + 3 ) >> 2;
|
|
|
1291 |
break;
|
|
|
1292 |
|
|
|
1293 |
case 4:
|
|
|
1294 |
map->pixel_mode = FT_PIXEL_MODE_GRAY4;
|
|
|
1295 |
map->pitch = ( map->width + 1 ) >> 1;
|
|
|
1296 |
break;
|
|
|
1297 |
|
|
|
1298 |
case 8:
|
|
|
1299 |
map->pixel_mode = FT_PIXEL_MODE_GRAY;
|
|
|
1300 |
map->pitch = map->width;
|
|
|
1301 |
break;
|
|
|
1302 |
|
|
|
1303 |
default:
|
|
|
1304 |
return SFNT_Err_Invalid_File_Format;
|
|
|
1305 |
}
|
|
|
1306 |
|
|
|
1307 |
size = map->rows * map->pitch;
|
|
|
1308 |
|
|
|
1309 |
/* check that there is no empty image */
|
|
|
1310 |
if ( size == 0 )
|
|
|
1311 |
goto Exit; /* exit successfully! */
|
|
|
1312 |
|
|
|
1313 |
error = ft_glyphslot_alloc_bitmap( slot, size );
|
|
|
1314 |
if (error)
|
|
|
1315 |
goto Exit;
|
|
|
1316 |
}
|
|
|
1317 |
|
|
|
1318 |
switch ( range->image_format )
|
|
|
1319 |
{
|
|
|
1320 |
case 1: /* single sbit image - load it */
|
|
|
1321 |
case 2:
|
|
|
1322 |
case 5:
|
|
|
1323 |
case 6:
|
|
|
1324 |
case 7:
|
|
|
1325 |
return Load_SBit_Single( map, x_offset, y_offset, strike->bit_depth,
|
|
|
1326 |
range->image_format, metrics, stream );
|
|
|
1327 |
|
|
|
1328 |
case 8: /* compound format */
|
|
|
1329 |
if ( FT_STREAM_SKIP( 1L ) )
|
|
|
1330 |
{
|
|
|
1331 |
error = SFNT_Err_Invalid_Stream_Skip;
|
|
|
1332 |
goto Exit;
|
|
|
1333 |
}
|
|
|
1334 |
/* fallthrough */
|
|
|
1335 |
|
|
|
1336 |
case 9:
|
|
|
1337 |
break;
|
|
|
1338 |
|
|
|
1339 |
default: /* invalid image format */
|
|
|
1340 |
return SFNT_Err_Invalid_File_Format;
|
|
|
1341 |
}
|
|
|
1342 |
|
|
|
1343 |
/* All right, we have a compound format. First of all, read */
|
|
|
1344 |
/* the array of elements. */
|
|
|
1345 |
{
|
|
|
1346 |
TT_SBit_Component components;
|
|
|
1347 |
TT_SBit_Component comp;
|
|
|
1348 |
FT_UShort num_components, count;
|
|
|
1349 |
|
|
|
1350 |
|
|
|
1351 |
if ( FT_READ_USHORT( num_components ) ||
|
|
|
1352 |
FT_NEW_ARRAY( components, num_components ) )
|
|
|
1353 |
goto Exit;
|
|
|
1354 |
|
|
|
1355 |
count = num_components;
|
|
|
1356 |
|
|
|
1357 |
if ( FT_FRAME_ENTER( 4L * num_components ) )
|
|
|
1358 |
goto Fail_Memory;
|
|
|
1359 |
|
|
|
1360 |
for ( comp = components; count > 0; count--, comp++ )
|
|
|
1361 |
{
|
|
|
1362 |
comp->glyph_code = FT_GET_USHORT();
|
|
|
1363 |
comp->x_offset = FT_GET_CHAR();
|
|
|
1364 |
comp->y_offset = FT_GET_CHAR();
|
|
|
1365 |
}
|
|
|
1366 |
|
|
|
1367 |
FT_FRAME_EXIT();
|
|
|
1368 |
|
|
|
1369 |
/* Now recursively load each element glyph */
|
|
|
1370 |
count = num_components;
|
|
|
1371 |
comp = components;
|
|
|
1372 |
for ( ; count > 0; count--, comp++ )
|
|
|
1373 |
{
|
|
|
1374 |
TT_SBit_Range elem_range;
|
|
|
1375 |
TT_SBit_MetricsRec elem_metrics;
|
|
|
1376 |
FT_ULong elem_offset;
|
|
|
1377 |
|
|
|
1378 |
|
|
|
1379 |
/* find the range for this element */
|
|
|
1380 |
error = find_sbit_range( comp->glyph_code,
|
|
|
1381 |
strike,
|
|
|
1382 |
&elem_range,
|
|
|
1383 |
&elem_offset );
|
|
|
1384 |
if ( error )
|
|
|
1385 |
goto Fail_Memory;
|
|
|
1386 |
|
|
|
1387 |
/* now load the element, recursively */
|
|
|
1388 |
error = Load_SBit_Image( strike,
|
|
|
1389 |
elem_range,
|
|
|
1390 |
ebdt_pos,
|
|
|
1391 |
elem_offset,
|
|
|
1392 |
slot,
|
|
|
1393 |
x_offset + comp->x_offset,
|
|
|
1394 |
y_offset + comp->y_offset,
|
|
|
1395 |
stream,
|
|
|
1396 |
&elem_metrics,
|
|
|
1397 |
depth + 1 );
|
|
|
1398 |
if ( error )
|
|
|
1399 |
goto Fail_Memory;
|
|
|
1400 |
}
|
|
|
1401 |
|
|
|
1402 |
Fail_Memory:
|
|
|
1403 |
FT_FREE( components );
|
|
|
1404 |
}
|
|
|
1405 |
|
|
|
1406 |
Exit:
|
|
|
1407 |
return error;
|
|
|
1408 |
}
|
|
|
1409 |
|
|
|
1410 |
|
|
|
1411 |
/*************************************************************************/
|
|
|
1412 |
/* */
|
|
|
1413 |
/* <Function> */
|
|
|
1414 |
/* tt_face_load_sbit_image */
|
|
|
1415 |
/* */
|
|
|
1416 |
/* <Description> */
|
|
|
1417 |
/* Loads a given glyph sbit image from the font resource. This also */
|
|
|
1418 |
/* returns its metrics. */
|
|
|
1419 |
/* */
|
|
|
1420 |
/* <Input> */
|
|
|
1421 |
/* face :: The target face object. */
|
|
|
1422 |
/* */
|
|
|
1423 |
/* strike_index :: The current strike index. */
|
|
|
1424 |
/* */
|
|
|
1425 |
/* glyph_index :: The current glyph index. */
|
|
|
1426 |
/* */
|
|
|
1427 |
/* load_flags :: The glyph load flags (the code checks for the flag */
|
|
|
1428 |
/* FT_LOAD_CROP_BITMAP). */
|
|
|
1429 |
/* */
|
|
|
1430 |
/* stream :: The input stream. */
|
|
|
1431 |
/* */
|
|
|
1432 |
/* <Output> */
|
|
|
1433 |
/* map :: The target pixmap. */
|
|
|
1434 |
/* */
|
|
|
1435 |
/* metrics :: A big sbit metrics structure for the glyph image. */
|
|
|
1436 |
/* */
|
|
|
1437 |
/* <Return> */
|
|
|
1438 |
/* FreeType error code. 0 means success. Returns an error if no */
|
|
|
1439 |
/* glyph sbit exists for the index. */
|
|
|
1440 |
/* */
|
|
|
1441 |
/* <Note> */
|
|
|
1442 |
/* The `map.buffer' field is always freed before the glyph is loaded. */
|
|
|
1443 |
/* */
|
|
|
1444 |
FT_LOCAL_DEF( FT_Error )
|
|
|
1445 |
tt_face_load_sbit_image( TT_Face face,
|
|
|
1446 |
FT_ULong strike_index,
|
|
|
1447 |
FT_UInt glyph_index,
|
|
|
1448 |
FT_UInt load_flags,
|
|
|
1449 |
FT_Stream stream,
|
|
|
1450 |
FT_Bitmap *map,
|
|
|
1451 |
TT_SBit_MetricsRec *metrics )
|
|
|
1452 |
{
|
|
|
1453 |
FT_Error error;
|
|
|
1454 |
FT_ULong ebdt_pos, glyph_offset;
|
|
|
1455 |
|
|
|
1456 |
TT_SBit_Strike strike;
|
|
|
1457 |
TT_SBit_Range range;
|
|
|
1458 |
|
|
|
1459 |
|
|
|
1460 |
/* Check whether there is a glyph sbit for the current index */
|
|
|
1461 |
error = tt_find_sbit_image( face, glyph_index, strike_index,
|
|
|
1462 |
&range, &strike, &glyph_offset );
|
|
|
1463 |
if ( error )
|
|
|
1464 |
goto Exit;
|
|
|
1465 |
|
|
|
1466 |
/* now, find the location of the `EBDT' table in */
|
|
|
1467 |
/* the font file */
|
|
|
1468 |
error = face->goto_table( face, TTAG_EBDT, stream, 0 );
|
|
|
1469 |
if ( error )
|
|
|
1470 |
error = face->goto_table( face, TTAG_bdat, stream, 0 );
|
|
|
1471 |
if ( error )
|
|
|
1472 |
goto Exit;
|
|
|
1473 |
|
|
|
1474 |
ebdt_pos = FT_STREAM_POS();
|
|
|
1475 |
|
|
|
1476 |
error = Load_SBit_Image( strike, range, ebdt_pos, glyph_offset,
|
|
|
1477 |
face->root.glyph, 0, 0, stream, metrics, 0 );
|
|
|
1478 |
if ( error )
|
|
|
1479 |
goto Exit;
|
|
|
1480 |
|
|
|
1481 |
/* setup vertical metrics if needed */
|
|
|
1482 |
if ( strike->flags & 1 )
|
|
|
1483 |
{
|
|
|
1484 |
/* in case of a horizontal strike only */
|
|
|
1485 |
FT_Int advance;
|
|
|
1486 |
|
|
|
1487 |
|
|
|
1488 |
advance = strike->hori.ascender - strike->hori.descender;
|
|
|
1489 |
|
|
|
1490 |
/* some heuristic values */
|
|
|
1491 |
|
|
|
1492 |
metrics->vertBearingX = (FT_Char)(-metrics->width / 2 );
|
|
|
1493 |
metrics->vertBearingY = (FT_Char)( ( advance - metrics->height ) / 2 );
|
|
|
1494 |
metrics->vertAdvance = (FT_Char)( advance * 12 / 10 );
|
|
|
1495 |
}
|
|
|
1496 |
|
|
|
1497 |
/* Crop the bitmap now, unless specified otherwise */
|
|
|
1498 |
if ( load_flags & FT_LOAD_CROP_BITMAP )
|
|
|
1499 |
crop_bitmap( map, metrics );
|
|
|
1500 |
|
|
|
1501 |
Exit:
|
|
|
1502 |
return error;
|
|
|
1503 |
}
|
|
|
1504 |
|
|
|
1505 |
#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */
|
|
|
1506 |
|
|
|
1507 |
|
|
|
1508 |
/* END */
|