| /***************************************************************************/ | |
| /* */ | |
| /* ttmtx.c */ | |
| /* */ | |
| /* Load the metrics tables common to TTF and OTF fonts (body). */ | |
| /* */ | |
| /* Copyright 2006-2015 by */ | |
| /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| /* */ | |
| /* This file is part of the FreeType project, and may only be used, */ | |
| /* modified, and distributed under the terms of the FreeType project */ | |
| /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| /* this file you indicate that you have read the license and */ | |
| /* understand and accept it fully. */ | |
| /* */ | |
| /***************************************************************************/ | |
| #include <ft2build.h> | |
| #include FT_INTERNAL_DEBUG_H | |
| #include FT_INTERNAL_STREAM_H | |
| #include FT_TRUETYPE_TAGS_H | |
| #include "ttmtx.h" | |
| #include "sferrors.h" | |
| /*************************************************************************/ | |
| /* */ | |
| /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ | |
| /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ | |
| /* messages during execution. */ | |
| /* */ | |
| #undef FT_COMPONENT | |
| #define FT_COMPONENT trace_ttmtx | |
| /*************************************************************************/ | |
| /* */ | |
| /* <Function> */ | |
| /* tt_face_load_hmtx */ | |
| /* */ | |
| /* <Description> */ | |
| /* Load the `hmtx' or `vmtx' table into a face object. */ | |
| /* */ | |
| /* <Input> */ | |
| /* face :: A handle to the target face object. */ | |
| /* */ | |
| /* stream :: The input stream. */ | |
| /* */ | |
| /* vertical :: A boolean flag. If set, load `vmtx'. */ | |
| /* */ | |
| /* <Return> */ | |
| /* FreeType error code. 0 means success. */ | |
| /* */ | |
| FT_LOCAL_DEF( FT_Error ) | |
| tt_face_load_hmtx( TT_Face face, | |
| FT_Stream stream, | |
| FT_Bool vertical ) | |
| { | |
| FT_Error error; | |
| FT_ULong tag, table_size; | |
| FT_ULong* ptable_offset; | |
| FT_ULong* ptable_size; | |
| if ( vertical ) | |
| { | |
| tag = TTAG_vmtx; | |
| ptable_offset = &face->vert_metrics_offset; | |
| ptable_size = &face->vert_metrics_size; | |
| } | |
| else | |
| { | |
| tag = TTAG_hmtx; | |
| ptable_offset = &face->horz_metrics_offset; | |
| ptable_size = &face->horz_metrics_size; | |
| } | |
| error = face->goto_table( face, tag, stream, &table_size ); | |
| if ( error ) | |
| goto Fail; | |
| *ptable_size = table_size; | |
| *ptable_offset = FT_STREAM_POS(); | |
| Fail: | |
| return error; | |
| } | |
| /*************************************************************************/ | |
| /* */ | |
| /* <Function> */ | |
| /* tt_face_load_hhea */ | |
| /* */ | |
| /* <Description> */ | |
| /* Load the `hhea' or 'vhea' table into a face object. */ | |
| /* */ | |
| /* <Input> */ | |
| /* face :: A handle to the target face object. */ | |
| /* */ | |
| /* stream :: The input stream. */ | |
| /* */ | |
| /* vertical :: A boolean flag. If set, load `vhea'. */ | |
| /* */ | |
| /* <Return> */ | |
| /* FreeType error code. 0 means success. */ | |
| /* */ | |
| FT_LOCAL_DEF( FT_Error ) | |
| tt_face_load_hhea( TT_Face face, | |
| FT_Stream stream, | |
| FT_Bool vertical ) | |
| { | |
| FT_Error error; | |
| TT_HoriHeader* header; | |
| static const FT_Frame_Field metrics_header_fields[] = | |
| { | |
| #undef FT_STRUCTURE | |
| #define FT_STRUCTURE TT_HoriHeader | |
| FT_FRAME_START( 36 ), | |
| FT_FRAME_ULONG ( Version ), | |
| FT_FRAME_SHORT ( Ascender ), | |
| FT_FRAME_SHORT ( Descender ), | |
| FT_FRAME_SHORT ( Line_Gap ), | |
| FT_FRAME_USHORT( advance_Width_Max ), | |
| FT_FRAME_SHORT ( min_Left_Side_Bearing ), | |
| FT_FRAME_SHORT ( min_Right_Side_Bearing ), | |
| FT_FRAME_SHORT ( xMax_Extent ), | |
| FT_FRAME_SHORT ( caret_Slope_Rise ), | |
| FT_FRAME_SHORT ( caret_Slope_Run ), | |
| FT_FRAME_SHORT ( caret_Offset ), | |
| FT_FRAME_SHORT ( Reserved[0] ), | |
| FT_FRAME_SHORT ( Reserved[1] ), | |
| FT_FRAME_SHORT ( Reserved[2] ), | |
| FT_FRAME_SHORT ( Reserved[3] ), | |
| FT_FRAME_SHORT ( metric_Data_Format ), | |
| FT_FRAME_USHORT( number_Of_HMetrics ), | |
| FT_FRAME_END | |
| }; | |
| if ( vertical ) | |
| { | |
| void *v = &face->vertical; | |
| error = face->goto_table( face, TTAG_vhea, stream, 0 ); | |
| if ( error ) | |
| goto Fail; | |
| header = (TT_HoriHeader*)v; | |
| } | |
| else | |
| { | |
| error = face->goto_table( face, TTAG_hhea, stream, 0 ); | |
| if ( error ) | |
| goto Fail; | |
| header = &face->horizontal; | |
| } | |
| if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) ) | |
| goto Fail; | |
| FT_TRACE3(( "Ascender: %5d\n", header->Ascender )); | |
| FT_TRACE3(( "Descender: %5d\n", header->Descender )); | |
| FT_TRACE3(( "number_Of_Metrics: %5u\n", header->number_Of_HMetrics )); | |
| header->long_metrics = NULL; | |
| header->short_metrics = NULL; | |
| Fail: | |
| return error; | |
| } | |
| /*************************************************************************/ | |
| /* */ | |
| /* <Function> */ | |
| /* tt_face_get_metrics */ | |
| /* */ | |
| /* <Description> */ | |
| /* Return the horizontal or vertical metrics in font units for a */ | |
| /* given glyph. The values are the left side bearing (top side */ | |
| /* bearing for vertical metrics) and advance width (advance height */ | |
| /* for vertical metrics). */ | |
| /* */ | |
| /* <Input> */ | |
| /* face :: A pointer to the TrueType face structure. */ | |
| /* */ | |
| /* vertical :: If set to TRUE, get vertical metrics. */ | |
| /* */ | |
| /* gindex :: The glyph index. */ | |
| /* */ | |
| /* <Output> */ | |
| /* abearing :: The bearing, either left side or top side. */ | |
| /* */ | |
| /* aadvance :: The advance width or advance height, depending on */ | |
| /* the `vertical' flag. */ | |
| /* */ | |
| FT_LOCAL_DEF( void ) | |
| tt_face_get_metrics( TT_Face face, | |
| FT_Bool vertical, | |
| FT_UInt gindex, | |
| FT_Short *abearing, | |
| FT_UShort *aadvance ) | |
| { | |
| FT_Error error; | |
| FT_Stream stream = face->root.stream; | |
| TT_HoriHeader* header; | |
| FT_ULong table_pos, table_size, table_end; | |
| FT_UShort k; | |
| if ( vertical ) | |
| { | |
| void* v = &face->vertical; | |
| header = (TT_HoriHeader*)v; | |
| table_pos = face->vert_metrics_offset; | |
| table_size = face->vert_metrics_size; | |
| } | |
| else | |
| { | |
| header = &face->horizontal; | |
| table_pos = face->horz_metrics_offset; | |
| table_size = face->horz_metrics_size; | |
| } | |
| table_end = table_pos + table_size; | |
| k = header->number_Of_HMetrics; | |
| if ( k > 0 ) | |
| { | |
| if ( gindex < (FT_UInt)k ) | |
| { | |
| table_pos += 4 * gindex; | |
| if ( table_pos + 4 > table_end ) | |
| goto NoData; | |
| if ( FT_STREAM_SEEK( table_pos ) || | |
| FT_READ_USHORT( *aadvance ) || | |
| FT_READ_SHORT( *abearing ) ) | |
| goto NoData; | |
| } | |
| else | |
| { | |
| table_pos += 4 * ( k - 1 ); | |
| if ( table_pos + 4 > table_end ) | |
| goto NoData; | |
| if ( FT_STREAM_SEEK( table_pos ) || | |
| FT_READ_USHORT( *aadvance ) ) | |
| goto NoData; | |
| table_pos += 4 + 2 * ( gindex - k ); | |
| if ( table_pos + 2 > table_end ) | |
| *abearing = 0; | |
| else | |
| { | |
| if ( !FT_STREAM_SEEK( table_pos ) ) | |
| (void)FT_READ_SHORT( *abearing ); | |
| } | |
| } | |
| } | |
| else | |
| { | |
| NoData: | |
| *abearing = 0; | |
| *aadvance = 0; | |
| } | |
| } | |
| /* END */ |