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author | Upstream <upstream-import@none> | 1970-01-12 13:46:40 +0000 |
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committer | Upstream <upstream-import@none> | 1970-01-12 13:46:40 +0000 |
commit | f463818dd9146e11105c0572fb119e757eb47768 (patch) | |
tree | b02df5e83cd23336bca0c568b740968af82fb0ea /src/truetype/ttpload.c | |
download | android_external_freetype-f463818dd9146e11105c0572fb119e757eb47768.tar.gz android_external_freetype-f463818dd9146e11105c0572fb119e757eb47768.tar.bz2 android_external_freetype-f463818dd9146e11105c0572fb119e757eb47768.zip |
external/freetype 2.3.5
Diffstat (limited to 'src/truetype/ttpload.c')
-rw-r--r-- | src/truetype/ttpload.c | 523 |
1 files changed, 523 insertions, 0 deletions
diff --git a/src/truetype/ttpload.c b/src/truetype/ttpload.c new file mode 100644 index 0000000..9d3381b --- /dev/null +++ b/src/truetype/ttpload.c @@ -0,0 +1,523 @@ +/***************************************************************************/ +/* */ +/* ttpload.c */ +/* */ +/* TrueType-specific tables loader (body). */ +/* */ +/* Copyright 1996-2001, 2002, 2004, 2005, 2006, 2007 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_OBJECTS_H +#include FT_INTERNAL_STREAM_H +#include FT_TRUETYPE_TAGS_H + +#include "ttpload.h" + +#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT +#include "ttgxvar.h" +#endif + +#include "tterrors.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_ttpload + + + /*************************************************************************/ + /* */ + /* <Function> */ + /* tt_face_load_loca */ + /* */ + /* <Description> */ + /* Load the locations table. */ + /* */ + /* <InOut> */ + /* face :: A handle to the target face object. */ + /* */ + /* <Input> */ + /* stream :: The input stream. */ + /* */ + /* <Return> */ + /* FreeType error code. 0 means success. */ + /* */ + + FT_LOCAL_DEF( FT_Error ) + tt_face_load_loca( TT_Face face, + FT_Stream stream ) + { + FT_Error error; + FT_ULong table_len; + + + /* we need the size of the `glyf' table for malformed `loca' tables */ + error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len ); + if ( error ) + goto Exit; + + FT_TRACE2(( "Locations " )); + error = face->goto_table( face, TTAG_loca, stream, &table_len ); + if ( error ) + { + error = TT_Err_Locations_Missing; + goto Exit; + } + + if ( face->header.Index_To_Loc_Format != 0 ) + { + if ( table_len >= 0x40000L ) + { + FT_TRACE2(( "table too large!\n" )); + error = TT_Err_Invalid_Table; + goto Exit; + } + face->num_locations = (FT_UInt)( table_len >> 2 ); + } + else + { + if ( table_len >= 0x20000L ) + { + FT_TRACE2(( "table too large!\n" )); + error = TT_Err_Invalid_Table; + goto Exit; + } + face->num_locations = (FT_UInt)( table_len >> 1 ); + } + + /* + * Extract the frame. We don't need to decompress it since + * we are able to parse it directly. + */ + if ( FT_FRAME_EXTRACT( table_len, face->glyph_locations ) ) + goto Exit; + + FT_TRACE2(( "loaded\n" )); + + Exit: + return error; + } + + + FT_LOCAL_DEF( FT_ULong ) + tt_face_get_location( TT_Face face, + FT_UInt gindex, + FT_UInt *asize ) + { + FT_ULong pos1, pos2; + FT_Byte* p; + FT_Byte* p_limit; + + + pos1 = pos2 = 0; + + if ( gindex < face->num_locations ) + { + if ( face->header.Index_To_Loc_Format != 0 ) + { + p = face->glyph_locations + gindex * 4; + p_limit = face->glyph_locations + face->num_locations * 4; + + pos1 = FT_NEXT_ULONG( p ); + pos2 = pos1; + + if ( p + 4 <= p_limit ) + pos2 = FT_NEXT_ULONG( p ); + } + else + { + p = face->glyph_locations + gindex * 2; + p_limit = face->glyph_locations + face->num_locations * 2; + + pos1 = FT_NEXT_USHORT( p ); + pos2 = pos1; + + if ( p + 2 <= p_limit ) + pos2 = FT_NEXT_USHORT( p ); + + pos1 <<= 1; + pos2 <<= 1; + } + } + + /* It isn't mentioned explicitly that the `loca' table must be */ + /* ordered, but implicitly it refers to the length of an entry */ + /* as the difference between the current and the next position. */ + /* Anyway, there do exist (malformed) fonts which don't obey */ + /* this rule, so we are only able to provide an upper bound for */ + /* the size. */ + if ( pos2 >= pos1 ) + *asize = (FT_UInt)( pos2 - pos1 ); + else + *asize = (FT_UInt)( face->glyf_len - pos1 ); + + return pos1; + } + + + FT_LOCAL_DEF( void ) + tt_face_done_loca( TT_Face face ) + { + FT_Stream stream = face->root.stream; + + + FT_FRAME_RELEASE( face->glyph_locations ); + face->num_locations = 0; + } + + + + /*************************************************************************/ + /* */ + /* <Function> */ + /* tt_face_load_cvt */ + /* */ + /* <Description> */ + /* Load the control value table into a face object. */ + /* */ + /* <InOut> */ + /* face :: A handle to the target face object. */ + /* */ + /* <Input> */ + /* stream :: A handle to the input stream. */ + /* */ + /* <Return> */ + /* FreeType error code. 0 means success. */ + /* */ + FT_LOCAL_DEF( FT_Error ) + tt_face_load_cvt( TT_Face face, + FT_Stream stream ) + { +#ifdef TT_USE_BYTECODE_INTERPRETER + + FT_Error error; + FT_Memory memory = stream->memory; + FT_ULong table_len; + + + FT_TRACE2(( "CVT " )); + + error = face->goto_table( face, TTAG_cvt, stream, &table_len ); + if ( error ) + { + FT_TRACE2(( "is missing!\n" )); + + face->cvt_size = 0; + face->cvt = NULL; + error = TT_Err_Ok; + + goto Exit; + } + + face->cvt_size = table_len / 2; + + if ( FT_NEW_ARRAY( face->cvt, face->cvt_size ) ) + goto Exit; + + if ( FT_FRAME_ENTER( face->cvt_size * 2L ) ) + goto Exit; + + { + FT_Short* cur = face->cvt; + FT_Short* limit = cur + face->cvt_size; + + + for ( ; cur < limit; cur++ ) + *cur = FT_GET_SHORT(); + } + + FT_FRAME_EXIT(); + FT_TRACE2(( "loaded\n" )); + +#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT + if ( face->doblend ) + error = tt_face_vary_cvt( face, stream ); +#endif + + Exit: + return error; + +#else /* !TT_USE_BYTECODE_INTERPRETER */ + + FT_UNUSED( face ); + FT_UNUSED( stream ); + + return TT_Err_Ok; + +#endif + } + + + /*************************************************************************/ + /* */ + /* <Function> */ + /* tt_face_load_fpgm */ + /* */ + /* <Description> */ + /* Load the font program. */ + /* */ + /* <InOut> */ + /* face :: A handle to the target face object. */ + /* */ + /* <Input> */ + /* stream :: A handle to the input stream. */ + /* */ + /* <Return> */ + /* FreeType error code. 0 means success. */ + /* */ + FT_LOCAL_DEF( FT_Error ) + tt_face_load_fpgm( TT_Face face, + FT_Stream stream ) + { +#ifdef TT_USE_BYTECODE_INTERPRETER + + FT_Error error; + FT_ULong table_len; + + + FT_TRACE2(( "Font program " )); + + /* The font program is optional */ + error = face->goto_table( face, TTAG_fpgm, stream, &table_len ); + if ( error ) + { + face->font_program = NULL; + face->font_program_size = 0; + error = TT_Err_Ok; + + FT_TRACE2(( "is missing!\n" )); + } + else + { + face->font_program_size = table_len; + if ( FT_FRAME_EXTRACT( table_len, face->font_program ) ) + goto Exit; + + FT_TRACE2(( "loaded, %12d bytes\n", face->font_program_size )); + } + + Exit: + return error; + +#else /* !TT_USE_BYTECODE_INTERPRETER */ + + FT_UNUSED( face ); + FT_UNUSED( stream ); + + return TT_Err_Ok; + +#endif + } + + + /*************************************************************************/ + /* */ + /* <Function> */ + /* tt_face_load_prep */ + /* */ + /* <Description> */ + /* Load the cvt program. */ + /* */ + /* <InOut> */ + /* face :: A handle to the target face object. */ + /* */ + /* <Input> */ + /* stream :: A handle to the input stream. */ + /* */ + /* <Return> */ + /* FreeType error code. 0 means success. */ + /* */ + FT_LOCAL_DEF( FT_Error ) + tt_face_load_prep( TT_Face face, + FT_Stream stream ) + { +#ifdef TT_USE_BYTECODE_INTERPRETER + + FT_Error error; + FT_ULong table_len; + + + FT_TRACE2(( "Prep program " )); + + error = face->goto_table( face, TTAG_prep, stream, &table_len ); + if ( error ) + { + face->cvt_program = NULL; + face->cvt_program_size = 0; + error = TT_Err_Ok; + + FT_TRACE2(( "is missing!\n" )); + } + else + { + face->cvt_program_size = table_len; + if ( FT_FRAME_EXTRACT( table_len, face->cvt_program ) ) + goto Exit; + + FT_TRACE2(( "loaded, %12d bytes\n", face->cvt_program_size )); + } + + Exit: + return error; + +#else /* !TT_USE_BYTECODE_INTERPRETER */ + + FT_UNUSED( face ); + FT_UNUSED( stream ); + + return TT_Err_Ok; + +#endif + } + + + /*************************************************************************/ + /* */ + /* <Function> */ + /* tt_face_load_hdmx */ + /* */ + /* <Description> */ + /* Load the `hdmx' table into the face object. */ + /* */ + /* <Input> */ + /* face :: A handle to the target face object. */ + /* */ + /* stream :: A handle to the input stream. */ + /* */ + /* <Return> */ + /* FreeType error code. 0 means success. */ + /* */ + + FT_LOCAL_DEF( FT_Error ) + tt_face_load_hdmx( TT_Face face, + FT_Stream stream ) + { + FT_Error error; + FT_Memory memory = stream->memory; + FT_UInt version, nn, num_records; + FT_ULong table_size, record_size; + FT_Byte* p; + FT_Byte* limit; + + + /* this table is optional */ + error = face->goto_table( face, TTAG_hdmx, stream, &table_size ); + if ( error || table_size < 8 ) + return TT_Err_Ok; + + if ( FT_FRAME_EXTRACT( table_size, face->hdmx_table ) ) + goto Exit; + + p = face->hdmx_table; + limit = p + table_size; + + version = FT_NEXT_USHORT( p ); + num_records = FT_NEXT_USHORT( p ); + record_size = FT_NEXT_ULONG( p ); + + /* The maximum number of bytes in an hdmx device record is the */ + /* maximum number of glyphs + 2; this is 0xFFFF + 2; this is */ + /* the reason why `record_size' is a long (which we read as */ + /* unsigned long for convenience). In practice, two bytes */ + /* sufficient to hold the size value. */ + /* */ + /* There are at least two fonts, HANNOM-A and HANNOM-B version */ + /* 2.0 (2005), which get this wrong: The upper two bytes of */ + /* the size value are set to 0xFF instead of 0x00. We catch */ + /* and fix this. */ + + if ( record_size >= 0xFFFF0000UL ) + record_size &= 0xFFFFU; + + /* The limit for `num_records' is a heuristic value. */ + + if ( version != 0 || num_records > 255 || record_size > 0x10001L ) + { + error = TT_Err_Invalid_File_Format; + goto Fail; + } + + if ( FT_NEW_ARRAY( face->hdmx_record_sizes, num_records ) ) + goto Fail; + + for ( nn = 0; nn < num_records; nn++ ) + { + if ( p + record_size > limit ) + break; + + face->hdmx_record_sizes[nn] = p[0]; + p += record_size; + } + + face->hdmx_record_count = nn; + face->hdmx_table_size = table_size; + face->hdmx_record_size = record_size; + + Exit: + return error; + + Fail: + FT_FRAME_RELEASE( face->hdmx_table ); + face->hdmx_table_size = 0; + goto Exit; + } + + + FT_LOCAL_DEF( void ) + tt_face_free_hdmx( TT_Face face ) + { + FT_Stream stream = face->root.stream; + FT_Memory memory = stream->memory; + + + FT_FREE( face->hdmx_record_sizes ); + FT_FRAME_RELEASE( face->hdmx_table ); + } + + + /*************************************************************************/ + /* */ + /* Return the advance width table for a given pixel size if it is found */ + /* in the font's `hdmx' table (if any). */ + /* */ + FT_LOCAL_DEF( FT_Byte* ) + tt_face_get_device_metrics( TT_Face face, + FT_UInt ppem, + FT_UInt gindex ) + { + FT_UInt nn; + FT_Byte* result = NULL; + FT_ULong record_size = face->hdmx_record_size; + FT_Byte* record = face->hdmx_table + 8; + + + for ( nn = 0; nn < face->hdmx_record_count; nn++ ) + if ( face->hdmx_record_sizes[nn] == ppem ) + { + gindex += 2; + if ( gindex < record_size ) + result = record + nn * record_size + gindex; + break; + } + + return result; + } + + +/* END */ |