core/src/fxge/fx_freetype/fxft2.5.01/src/sfnt/ttmtx.c - Issue 815103002: Update freetype to 2.5.4.

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Issue 815103002: Update freetype to 2.5.4. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master

Patch Set: Adjust GYP and GN Created 6 years ago

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1 /***************************************************************************/

2 /* */

3 /* ttmtx.c */

4 /* */

5 /* Load the metrics tables common to TTF and OTF fonts (body). */

6 /* */

7 /* Copyright 2006-2009, 2011-2013 by */

8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */

9 /* */

10 /* This file is part of the FreeType project, and may only be used, */

11 /* modified, and distributed under the terms of the FreeType project */

12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */

13 /* this file you indicate that you have read the license and */

14 /* understand and accept it fully. */

15 /* */

16 /***************************************************************************/

17

18

19 #include "../../include/ft2build.h"

20 #include "../../include/freetype/internal/ftdebug.h"

21 #include "../../include/freetype/internal/ftstream.h"

22 #include "../../include/freetype/tttags.h"

23 #include "ttmtx.h"

24

25 #include "sferrors.h"

26

27

28 /*************************************************************************/

29 /* */

30 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */

31 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */

32 /* messages during execution. */

33 /* */

34 #undef FT_COMPONENT

35 #define FT_COMPONENT trace_ttmtx

36

37

38 /*************************************************************************/

39 /* */

40 /* <Function> */

41 /* tt_face_load_hmtx */

42 /* */

43 /* <Description> */

44 /* Load the `hmtx' or `vmtx' table into a face object. */

45 /* */

46 /* <Input> */

47 /* face :: A handle to the target face object. */

48 /* */

49 /* stream :: The input stream. */

50 /* */

51 /* vertical :: A boolean flag. If set, load `vmtx'. */

52 /* */

53 /* <Return> */

54 /* FreeType error code. 0 means success. */

55 /* */

56 FT_LOCAL_DEF( FT_Error )

57 tt_face_load_hmtx( TT_Face face,

58 FT_Stream stream,

59 FT_Bool vertical )

60 {

61 FT_Error error;

62 FT_ULong tag, table_size;

63 FT_ULong* ptable_offset;

64 FT_ULong* ptable_size;

65

66

67 if ( vertical )

68 {

69 tag = TTAG_vmtx;

70 ptable_offset = &face->vert_metrics_offset;

71 ptable_size = &face->vert_metrics_size;

72 }

73 else

74 {

75 tag = TTAG_hmtx;

76 ptable_offset = &face->horz_metrics_offset;

77 ptable_size = &face->horz_metrics_size;

78 }

79

80 error = face->goto_table( face, tag, stream, &table_size );

81 #if 0

82 if ( error )

83 goto Fail;

84

85 *ptable_size = table_size;

86 *ptable_offset = FT_STREAM_POS();

87

88 Fail:

89 return error;

90 #else

91 *ptable_size = error ? 0 : table_size;

92 *ptable_offset = FT_STREAM_POS();

93

94 return 0;

95 #endif

96 }

97

98

99 /*************************************************************************/

100 /* */

101 /* <Function> */

102 /* tt_face_load_hhea */

103 /* */

104 /* <Description> */

105 /* Load the `hhea' or 'vhea' table into a face object. */

106 /* */

107 /* <Input> */

108 /* face :: A handle to the target face object. */

109 /* */

110 /* stream :: The input stream. */

111 /* */

112 /* vertical :: A boolean flag. If set, load `vhea'. */

113 /* */

114 /* <Return> */

115 /* FreeType error code. 0 means success. */

116 /* */

117 FT_LOCAL_DEF( FT_Error )

118 tt_face_load_hhea( TT_Face face,

119 FT_Stream stream,

120 FT_Bool vertical )

121 {

122 FT_Error error;

123 TT_HoriHeader* header;

124

125 static const FT_Frame_Field metrics_header_fields[] =

126 {

127 #undef FT_STRUCTURE

128 #define FT_STRUCTURE TT_HoriHeader

129

130 FT_FRAME_START( 36 ),

131 FT_FRAME_ULONG ( Version ),

132 FT_FRAME_SHORT ( Ascender ),

133 FT_FRAME_SHORT ( Descender ),

134 FT_FRAME_SHORT ( Line_Gap ),

135 FT_FRAME_USHORT( advance_Width_Max ),

136 FT_FRAME_SHORT ( min_Left_Side_Bearing ),

137 FT_FRAME_SHORT ( min_Right_Side_Bearing ),

138 FT_FRAME_SHORT ( xMax_Extent ),

139 FT_FRAME_SHORT ( caret_Slope_Rise ),

140 FT_FRAME_SHORT ( caret_Slope_Run ),

141 FT_FRAME_SHORT ( caret_Offset ),

142 FT_FRAME_SHORT ( Reserved[0] ),

143 FT_FRAME_SHORT ( Reserved[1] ),

144 FT_FRAME_SHORT ( Reserved[2] ),

145 FT_FRAME_SHORT ( Reserved[3] ),

146 FT_FRAME_SHORT ( metric_Data_Format ),

147 FT_FRAME_USHORT( number_Of_HMetrics ),

148 FT_FRAME_END

149 };

150

151

152 if ( vertical )

153 {

154 void *v = &face->vertical;

155

156

157 error = face->goto_table( face, TTAG_vhea, stream, 0 );

158 if ( error )

159 goto Fail;

160

161 header = (TT_HoriHeader*)v;

162 }

163 else

164 {

165 error = face->goto_table( face, TTAG_hhea, stream, 0 );

166 if ( error )

167 goto Fail;

168

169 header = &face->horizontal;

170 }

171

172 if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )

173 goto Fail;

174

175 FT_TRACE3(( "Ascender: %5d\n", header->Ascender ));

176 FT_TRACE3(( "Descender: %5d\n", header->Descender ));

177 FT_TRACE3(( "number_Of_Metrics: %5u\n", header->number_Of_HMetrics ));

178

179 header->long_metrics = NULL;

180 header->short_metrics = NULL;

181

182 Fail:

183 return error;

184 }

185

186

187 /*************************************************************************/

188 /* */

189 /* <Function> */

190 /* tt_face_get_metrics */

191 /* */

192 /* <Description> */

193 /* Returns the horizontal or vertical metrics in font units for a */

194 /* given glyph. The metrics are the left side bearing (resp. top */

195 /* side bearing) and advance width (resp. advance height). */

196 /* */

197 /* <Input> */

198 /* header :: A pointer to either the horizontal or vertical metrics */

199 /* structure. */

200 /* */

201 /* idx :: The glyph index. */

202 /* */

203 /* <Output> */

204 /* bearing :: The bearing, either left side or top side. */

205 /* */

206 /* advance :: The advance width resp. advance height. */

207 /* */

208 FT_LOCAL_DEF( FT_Error )

209 tt_face_get_metrics( TT_Face face,

210 FT_Bool vertical,

211 FT_UInt gindex,

212 FT_Short *abearing,

213 FT_UShort *aadvance )

214 {

215 FT_Error error;

216 FT_Stream stream = face->root.stream;

217 TT_HoriHeader* header;

218 FT_ULong table_pos, table_size, table_end;

219 FT_UShort k;

220

221

222 if ( vertical )

223 {

224 void* v = &face->vertical;

225

226

227 header = (TT_HoriHeader*)v;

228 table_pos = face->vert_metrics_offset;

229 table_size = face->vert_metrics_size;

230 }

231 else

232 {

233 header = &face->horizontal;

234 table_pos = face->horz_metrics_offset;

235 table_size = face->horz_metrics_size;

236 }

237

238 table_end = table_pos + table_size;

239

240 k = header->number_Of_HMetrics;

241

242 if ( k > 0 )

243 {

244 if ( gindex < (FT_UInt)k )

245 {

246 table_pos += 4 * gindex;

247 if ( table_pos + 4 > table_end )

248 goto NoData;

249

250 if ( FT_STREAM_SEEK( table_pos ) \|\|

251 FT_READ_USHORT( *aadvance ) \|\|

252 FT_READ_SHORT( *abearing ) )

253 goto NoData;

254 }

255 else

256 {

257 table_pos += 4 * ( k - 1 );

258 if ( table_pos + 4 > table_end )

259 goto NoData;

260

261 if ( FT_STREAM_SEEK( table_pos ) \|\|

262 FT_READ_USHORT( *aadvance ) )

263 goto NoData;

264

265 table_pos += 4 + 2 * ( gindex - k );

266 if ( table_pos + 2 > table_end )

267 *abearing = 0;

268 else

269 {

270 if ( !FT_STREAM_SEEK( table_pos ) )

271 (void)FT_READ_SHORT( *abearing );

272 }

273 }

274 }

275 else

276 {

277 NoData:

278 *abearing = 0;

279 *aadvance = 0;

280 }

281

282 return FT_Err_Ok;

283 }

284

285

286 /* END */

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