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* src/sfnt/ttmtx.h, src/sfnt/ttmtx.c: Why are there two copies of

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Wu, Chia-I (吳佳一) 2006-02-14 07:20:06 +00:00
parent 65863a5712
commit e0decd1e27
3 changed files with 5 additions and 568 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2006-02-13 Chia-I Wu <b90201047@ntu.edu.tw>
* src/sfnt/ttmtx.h, src/sfnt/ttmtx.c: Why are there two copies of
code...
2006-02-13 Chia-I Wu <b90201047@ntu.edu.tw>
Clean up the SFNT_Interface. In this pass, we want to treat the font

519
src/sfnt/ttmtx.c
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@ -516,523 +516,4 @@
#endif /* !FT_OPTIMIZE_MEMORY */
/* END */
/***************************************************************************/
/* */
/* ttmtx.c */
/* */
/* Load the metrics tables common to TTF and OTF fonts (body). */
/* */
/* Copyright 2006 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. */
/* */
#ifdef FT_OPTIMIZE_MEMORY
static FT_Error
tt_face_load_hmtx( TT_Face face,
FT_Stream stream,
FT_Bool vertical )
{
FT_Error error;
FT_ULong table_size;
FT_Byte** ptable;
FT_ULong* ptable_size;
FT_TRACE2(( "TT_Load_%s_Metrics: %08p\n", vertical ? "Vertical"
: "Horizontal",
face ));
if ( vertical )
{
ptable = &face->vert_metrics;
ptable_size = &face->vert_metrics_size;
/* The table is optional, quit silently if it wasn't found. */
/* */
/* XXX: Some fonts have a valid vertical header with a non-null */
/* `number_of_VMetrics' fields, but no corresponding `vmtx' */
/* table to get the metrics from (e.g. mingliu). */
/* */
/* For safety, we set the field to 0! */
/* */
error = face->goto_table( face, TTAG_vmtx, stream, &table_size );
if ( error )
{
/* Set number_Of_VMetrics to 0! */
FT_TRACE2(( " no vertical header in file.\n" ));
error = SFNT_Err_Ok;
goto Exit;
}
}
else
{
ptable = &face->horz_metrics;
ptable_size = &face->horz_metrics_size;
error = face->goto_table( face, TTAG_hmtx, stream, &table_size );
if ( error )
{
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* If this is an incrementally loaded font and there are */
/* overriding metrics, tolerate a missing `hmtx' table. */
if ( face->root.internal->incremental_interface &&
face->root.internal->incremental_interface->funcs->
get_glyph_metrics )
{
face->horizontal.number_Of_HMetrics = 0;
error = SFNT_Err_Ok;
goto Exit;
}
#endif
FT_ERROR(( " no horizontal metrics in file!\n" ));
error = SFNT_Err_Hmtx_Table_Missing;
goto Exit;
}
}
if ( FT_FRAME_EXTRACT( table_size, *ptable ) )
goto Exit;
*ptable_size = table_size;
Exit:
return error;
}
#else /* !OPTIMIZE_MEMORY */
static FT_Error
tt_face_load_hmtx( TT_Face face,
FT_Stream stream,
FT_Bool vertical )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_len;
FT_Long num_shorts, num_longs, num_shorts_checked;
TT_LongMetrics * longs;
TT_ShortMetrics** shorts;
FT_TRACE2(( "TT_Load_%s_Metrics: %08p\n", vertical ? "Vertical"
: "Horizontal",
face ));
if ( vertical )
{
/* The table is optional, quit silently if it wasn't found. */
/* */
/* XXX: Some fonts have a valid vertical header with a non-null */
/* `number_of_VMetrics' fields, but no corresponding `vmtx' */
/* table to get the metrics from (e.g. mingliu). */
/* */
/* For safety, we set the field to 0! */
/* */
error = face->goto_table( face, TTAG_vmtx, stream, &table_len );
if ( error )
{
/* Set number_Of_VMetrics to 0! */
FT_TRACE2(( " no vertical header in file.\n" ));
face->vertical.number_Of_VMetrics = 0;
error = SFNT_Err_Ok;
goto Exit;
}
num_longs = face->vertical.number_Of_VMetrics;
longs = (TT_LongMetrics *)&face->vertical.long_metrics;
shorts = (TT_ShortMetrics**)&face->vertical.short_metrics;
}
else
{
error = face->goto_table( face, TTAG_hmtx, stream, &table_len );
if ( error )
{
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* If this is an incrementally loaded font and there are */
/* overriding metrics, tolerate a missing `hmtx' table. */
if ( face->root.internal->incremental_interface &&
face->root.internal->incremental_interface->funcs->
get_glyph_metrics )
{
face->horizontal.number_Of_HMetrics = 0;
error = SFNT_Err_Ok;
goto Exit;
}
#endif
FT_ERROR(( " no horizontal metrics in file!\n" ));
error = SFNT_Err_Hmtx_Table_Missing;
goto Exit;
}
num_longs = face->horizontal.number_Of_HMetrics;
longs = (TT_LongMetrics *)&face->horizontal.long_metrics;
shorts = (TT_ShortMetrics**)&face->horizontal.short_metrics;
}
/* never trust derived values */
num_shorts = face->max_profile.numGlyphs - num_longs;
num_shorts_checked = ( table_len - num_longs * 4L ) / 2;
if ( num_shorts < 0 )
{
FT_ERROR(( "TT_Load_%s_Metrics: more metrics than glyphs!\n",
vertical ? "Vertical"
: "Horizontal" ));
/* Adobe simply ignores this problem. So we shall do the same. */
#if 0
error = vertical ? SFNT_Err_Invalid_Vert_Metrics
: SFNT_Err_Invalid_Horiz_Metrics;
goto Exit;
#else
num_shorts = 0;
#endif
}
if ( FT_QNEW_ARRAY( *longs, num_longs ) ||
FT_QNEW_ARRAY( *shorts, num_shorts ) )
goto Exit;
if ( FT_FRAME_ENTER( table_len ) )
goto Exit;
{
TT_LongMetrics cur = *longs;
TT_LongMetrics limit = cur + num_longs;
for ( ; cur < limit; cur++ )
{
cur->advance = FT_GET_USHORT();
cur->bearing = FT_GET_SHORT();
}
}
/* do we have an inconsistent number of metric values? */
{
TT_ShortMetrics* cur = *shorts;
TT_ShortMetrics* limit = cur +
FT_MIN( num_shorts, num_shorts_checked );
for ( ; cur < limit; cur++ )
*cur = FT_GET_SHORT();
/* We fill up the missing left side bearings with the */
/* last valid value. Since this will occur for buggy CJK */
/* fonts usually only, nothing serious will happen. */
if ( num_shorts > num_shorts_checked && num_shorts_checked > 0 )
{
FT_Short val = (*shorts)[num_shorts_checked - 1];
limit = *shorts + num_shorts;
for ( ; cur < limit; cur++ )
*cur = val;
}
}
FT_FRAME_EXIT();
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
#endif /* !FT_OPTIMIZE_METRICS */
/*************************************************************************/
/* */
/* <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;
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
};
FT_TRACE2(( vertical ? "Vertical header " : "Horizontal header " ));
if ( vertical )
{
face->vertical_info = 0;
/* The vertical header table is optional, so return quietly if */
/* we don't find it. */
error = face->goto_table( face, TTAG_vhea, stream, 0 );
if ( error )
{
error = SFNT_Err_Ok;
goto Exit;
}
face->vertical_info = 1;
header = (TT_HoriHeader*)&face->vertical;
}
else
{
/* The horizontal header is mandatory for most fonts; return */
/* an error if we don't find it. */
error = face->goto_table( face, TTAG_hhea, stream, 0 );
if ( error )
{
error = SFNT_Err_Horiz_Header_Missing;
/* No `hhea' table necessary for SFNT Mac fonts. */
if ( face->format_tag == TTAG_true )
{
FT_TRACE2(( "missing. This is an SFNT Mac font.\n"));
error = SFNT_Err_Ok;
}
goto Exit;
}
header = &face->horizontal;
}
if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )
goto Exit;
header->long_metrics = NULL;
header->short_metrics = NULL;
FT_TRACE2(( "loaded\n" ));
/* Now try to load the corresponding metrics */
error = tt_face_load_hmtx( face, stream, vertical );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_get_metrics */
/* */
/* <Description> */
/* Returns the horizontal or vertical metrics in font units for a */
/* given glyph. The metrics are the left side bearing (resp. top */
/* side bearing) and advance width (resp. advance height). */
/* */
/* <Input> */
/* header :: A pointer to either the horizontal or vertical metrics */
/* structure. */
/* */
/* idx :: The glyph index. */
/* */
/* <Output> */
/* bearing :: The bearing, either left side or top side. */
/* */
/* advance :: The advance width resp. advance height. */
/* */
/* <Note> */
/* This function will much probably move to another component in the */
/* near future, but I haven't decided which yet. */
/* */
#ifdef FT_OPTIMIZE_MEMORY
FT_LOCAL_DEF( FT_Error )
tt_face_get_metrics( TT_Face face,
FT_Bool vertical,
FT_UInt gindex,
FT_Short *abearing,
FT_UShort *aadvance )
{
TT_HoriHeader* header;
FT_Byte* p;
FT_Byte* limit;
FT_UShort k;
if ( vertical )
{
header = (TT_HoriHeader*)&face->vertical;
p = face->vert_metrics;
limit = p + face->vert_metrics_size;
}
else
{
header = &face->horizontal;
p = face->horz_metrics;
limit = p + face->horz_metrics_size;
}
k = header->number_Of_HMetrics;
if ( k > 0 )
{
if ( gindex < (FT_UInt)k )
{
p += 4 * gindex;
if ( p + 4 > limit )
goto NoData;
*aadvance = FT_NEXT_USHORT( p );
*abearing = FT_NEXT_SHORT( p );
}
else
{
p += 4 * ( k - 1 );
if ( p + 4 > limit )
goto NoData;
*aadvance = FT_NEXT_USHORT( p );
p += 2 + 2 * ( gindex - k );
if ( p + 2 > limit )
*abearing = 0;
else
*abearing = FT_PEEK_SHORT( p );
}
}
else
{
NoData:
*abearing = 0;
*aadvance = 0;
}
return SFNT_Err_Ok;
}
#else /* !FT_OPTIMIZE_MEMORY */
FT_LOCAL_DEF( FT_Error )
tt_face_get_metrics( TT_Face face,
FT_Bool vertical,
FT_UInt gindex,
FT_Short* abearing,
FT_UShort* aadvance )
{
TT_HoriHeader* header = vertical ? (TT_HoriHeader*)&face->vertical
: &face->horizontal;
TT_LongMetrics longs_m;
FT_UShort k = header->number_Of_HMetrics;
if ( k == 0 )
{
*abearing = *aadvance = 0;
return SFNT_Err_Ok;
}
if ( gindex < (FT_UInt)k )
{
longs_m = (TT_LongMetrics)header->long_metrics + gindex;
*abearing = longs_m->bearing;
*aadvance = longs_m->advance;
}
else
{
*abearing = ((TT_ShortMetrics*)header->short_metrics)[gindex - k];
*aadvance = ((TT_LongMetrics)header->long_metrics)[k - 1].advance;
}
return SFNT_Err_Ok;
}
#endif /* !FT_OPTIMIZE_MEMORY */
/* END */

49
src/sfnt/ttmtx.h
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@ -46,53 +46,4 @@ FT_END_HEADER
#endif /* __TTMTX_H__ */
/* END */
/***************************************************************************/
/* */
/* ttmtx.h */
/* */
/* Load the metrics tables common to TTF and OTF fonts (specification). */
/* */
/* Copyright 2006 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. */
/* */
/***************************************************************************/
#ifndef __TTMTX_H__
#define __TTMTX_H__
#include <ft2build.h>
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_TRUETYPE_TYPES_H
FT_BEGIN_HEADER
FT_LOCAL( FT_Error )
tt_face_load_hhea( TT_Face face,
FT_Stream stream,
FT_Bool vertical );
FT_LOCAL( FT_Error )
tt_face_get_metrics( TT_Face face,
FT_Bool vertical,
FT_UInt gindex,
FT_Short* abearing,
FT_UShort* aadvance );
FT_END_HEADER
#endif /* __TTMTX_H__ */
/* END */