441 lines
15 KiB
C
441 lines
15 KiB
C
/***************************************************************************/
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/* */
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/* ttmtx.c */
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/* */
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/* Load the metrics tables common to TTF and OTF fonts (body). */
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/* */
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/* Copyright 2006 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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#include "ttmtx.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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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttmtx
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/*
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* Unfortunately, we can't enable our memory optimizations if
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* FT_CONFIG_OPTION_OLD_INTERNALS is defined. This is because at least
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* one rogue client (libXfont in the X.Org XServer) is directly accessing
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* the metrics.
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*/
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_load_hmtx */
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/* */
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/* <Description> */
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/* Load the `hmtx' or `vmtx' table into a face object. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* vertical :: A boolean flag. If set, load `vmtx'. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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#if defined FT_OPTIMIZE_MEMORY && !defined FT_CONFIG_OPTION_OLD_INTERNALS
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_hmtx( TT_Face face,
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FT_Stream stream,
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FT_Bool vertical )
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{
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FT_Error error;
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FT_ULong table_size;
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FT_Byte** ptable;
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FT_ULong* ptable_size;
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if ( vertical )
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{
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error = face->goto_table( face, TTAG_vmtx, stream, &table_size );
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if ( error )
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goto Fail;
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ptable = &face->vert_metrics;
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ptable_size = &face->vert_metrics_size;
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}
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else
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{
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error = face->goto_table( face, TTAG_hmtx, stream, &table_size );
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if ( error )
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goto Fail;
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ptable = &face->horz_metrics;
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ptable_size = &face->horz_metrics_size;
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}
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if ( FT_FRAME_EXTRACT( table_size, *ptable ) )
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goto Fail;
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*ptable_size = table_size;
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Fail:
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return error;
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}
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#else /* !OPTIMIZE_MEMORY || OLD_INTERNALS */
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_hmtx( TT_Face face,
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FT_Stream stream,
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FT_Bool vertical )
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{
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FT_Error error;
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FT_Memory memory = stream->memory;
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FT_ULong table_len;
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FT_Long num_shorts, num_longs, num_shorts_checked;
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TT_LongMetrics * longs;
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TT_ShortMetrics** shorts;
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if ( vertical )
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{
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error = face->goto_table( face, TTAG_vmtx, stream, &table_len );
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if ( error )
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goto Fail;
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num_longs = face->vertical.number_Of_VMetrics;
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if ( (FT_ULong)num_longs > table_len / 4 )
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num_longs = (FT_Long)(table_len / 4);
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face->vertical.number_Of_VMetrics = 0;
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longs = (TT_LongMetrics *)&face->vertical.long_metrics;
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shorts = (TT_ShortMetrics**)&face->vertical.short_metrics;
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}
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else
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{
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error = face->goto_table( face, TTAG_hmtx, stream, &table_len );
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if ( error )
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goto Fail;
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num_longs = face->horizontal.number_Of_HMetrics;
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if ( (FT_ULong)num_longs > table_len / 4 )
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num_longs = (FT_Long)(table_len / 4);
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face->horizontal.number_Of_HMetrics = 0;
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longs = (TT_LongMetrics *)&face->horizontal.long_metrics;
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shorts = (TT_ShortMetrics**)&face->horizontal.short_metrics;
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}
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/* never trust derived values */
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num_shorts = face->max_profile.numGlyphs - num_longs;
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num_shorts_checked = ( table_len - num_longs * 4L ) / 2;
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if ( num_shorts < 0 )
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{
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FT_ERROR(( "%cmtx has more metrics than glyphs.\n" ));
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/* Adobe simply ignores this problem. So we shall do the same. */
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#if 0
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error = vertical ? SFNT_Err_Invalid_Vert_Metrics
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: SFNT_Err_Invalid_Horiz_Metrics;
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goto Exit;
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#else
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num_shorts = 0;
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#endif
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}
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if ( FT_QNEW_ARRAY( *longs, num_longs ) ||
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FT_QNEW_ARRAY( *shorts, num_shorts ) )
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goto Fail;
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if ( FT_FRAME_ENTER( table_len ) )
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goto Fail;
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{
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TT_LongMetrics cur = *longs;
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TT_LongMetrics limit = cur + num_longs;
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for ( ; cur < limit; cur++ )
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{
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cur->advance = FT_GET_USHORT();
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cur->bearing = FT_GET_SHORT();
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}
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}
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/* do we have an inconsistent number of metric values? */
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{
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TT_ShortMetrics* cur = *shorts;
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TT_ShortMetrics* limit = cur +
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FT_MIN( num_shorts, num_shorts_checked );
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for ( ; cur < limit; cur++ )
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*cur = FT_GET_SHORT();
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/* We fill up the missing left side bearings with the */
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/* last valid value. Since this will occur for buggy CJK */
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/* fonts usually only, nothing serious will happen. */
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if ( num_shorts > num_shorts_checked && num_shorts_checked > 0 )
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{
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FT_Short val = (*shorts)[num_shorts_checked - 1];
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limit = *shorts + num_shorts;
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for ( ; cur < limit; cur++ )
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*cur = val;
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}
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}
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FT_FRAME_EXIT();
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if ( vertical )
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face->vertical.number_Of_VMetrics = (FT_UShort)num_longs;
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else
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face->horizontal.number_Of_HMetrics = (FT_UShort)num_longs;
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Fail:
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return error;
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}
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#endif /* !OPTIMIZE_MEMORY || OLD_INTERNALS */
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_load_hhea */
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/* */
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/* <Description> */
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/* Load the `hhea' or 'vhea' table into a face object. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* vertical :: A boolean flag. If set, load `vhea'. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_hhea( TT_Face face,
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FT_Stream stream,
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FT_Bool vertical )
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{
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FT_Error error;
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TT_HoriHeader* header;
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const FT_Frame_Field metrics_header_fields[] =
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{
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#undef FT_STRUCTURE
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#define FT_STRUCTURE TT_HoriHeader
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FT_FRAME_START( 36 ),
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FT_FRAME_ULONG ( Version ),
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FT_FRAME_SHORT ( Ascender ),
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FT_FRAME_SHORT ( Descender ),
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FT_FRAME_SHORT ( Line_Gap ),
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FT_FRAME_USHORT( advance_Width_Max ),
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FT_FRAME_SHORT ( min_Left_Side_Bearing ),
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FT_FRAME_SHORT ( min_Right_Side_Bearing ),
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FT_FRAME_SHORT ( xMax_Extent ),
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FT_FRAME_SHORT ( caret_Slope_Rise ),
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FT_FRAME_SHORT ( caret_Slope_Run ),
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FT_FRAME_SHORT ( caret_Offset ),
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FT_FRAME_SHORT ( Reserved[0] ),
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FT_FRAME_SHORT ( Reserved[1] ),
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FT_FRAME_SHORT ( Reserved[2] ),
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FT_FRAME_SHORT ( Reserved[3] ),
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FT_FRAME_SHORT ( metric_Data_Format ),
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FT_FRAME_USHORT( number_Of_HMetrics ),
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FT_FRAME_END
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};
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if ( vertical )
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{
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error = face->goto_table( face, TTAG_vhea, stream, 0 );
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if ( error )
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goto Fail;
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header = (TT_HoriHeader*)&face->vertical;
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}
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else
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{
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error = face->goto_table( face, TTAG_hhea, stream, 0 );
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if ( error )
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goto Fail;
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header = &face->horizontal;
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}
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if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )
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goto Fail;
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FT_TRACE3(( "Ascender: %5d\n", header->Ascender ));
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FT_TRACE3(( "Descender: %5d\n", header->Descender ));
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FT_TRACE3(( "number_Of_Metrics: %5u\n", header->number_Of_HMetrics ));
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header->long_metrics = NULL;
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header->short_metrics = NULL;
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Fail:
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_get_metrics */
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/* */
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/* <Description> */
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/* Returns the horizontal or vertical metrics in font units for a */
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/* given glyph. The metrics are the left side bearing (resp. top */
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/* side bearing) and advance width (resp. advance height). */
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/* */
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/* <Input> */
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/* header :: A pointer to either the horizontal or vertical metrics */
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/* structure. */
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/* */
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/* idx :: The glyph index. */
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/* */
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/* <Output> */
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/* bearing :: The bearing, either left side or top side. */
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/* */
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/* advance :: The advance width resp. advance height. */
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/* */
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#if defined FT_OPTIMIZE_MEMORY && !defined FT_CONFIG_OPTION_OLD_INTERNALS
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FT_LOCAL_DEF( FT_Error )
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tt_face_get_metrics( TT_Face face,
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FT_Bool vertical,
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FT_UInt gindex,
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FT_Short *abearing,
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FT_UShort *aadvance )
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{
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TT_HoriHeader* header;
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FT_Byte* p;
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FT_Byte* limit;
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FT_UShort k;
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if ( vertical )
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{
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header = (TT_HoriHeader*)&face->vertical;
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p = face->vert_metrics;
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limit = p + face->vert_metrics_size;
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}
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else
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{
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header = &face->horizontal;
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p = face->horz_metrics;
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limit = p + face->horz_metrics_size;
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}
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k = header->number_Of_HMetrics;
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if ( k > 0 )
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{
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if ( gindex < (FT_UInt)k )
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{
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p += 4 * gindex;
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if ( p + 4 > limit )
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goto NoData;
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*aadvance = FT_NEXT_USHORT( p );
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*abearing = FT_NEXT_SHORT( p );
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}
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else
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{
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p += 4 * ( k - 1 );
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if ( p + 4 > limit )
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goto NoData;
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*aadvance = FT_NEXT_USHORT( p );
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p += 2 + 2 * ( gindex - k );
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if ( p + 2 > limit )
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*abearing = 0;
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else
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*abearing = FT_PEEK_SHORT( p );
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}
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}
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else
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{
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NoData:
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*abearing = 0;
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*aadvance = 0;
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}
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return SFNT_Err_Ok;
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}
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#else /* !OPTIMIZE_MEMORY || OLD_INTERNALS */
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FT_LOCAL_DEF( FT_Error )
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tt_face_get_metrics( TT_Face face,
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FT_Bool vertical,
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FT_UInt gindex,
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FT_Short* abearing,
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FT_UShort* aadvance )
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{
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TT_HoriHeader* header = vertical ? (TT_HoriHeader*)&face->vertical
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: &face->horizontal;
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TT_LongMetrics longs_m;
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FT_UShort k = header->number_Of_HMetrics;
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if ( k == 0 ||
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!header->long_metrics ||
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gindex >= (FT_UInt)face->max_profile.numGlyphs )
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{
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*abearing = *aadvance = 0;
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return SFNT_Err_Ok;
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}
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if ( gindex < (FT_UInt)k )
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{
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longs_m = (TT_LongMetrics)header->long_metrics + gindex;
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*abearing = longs_m->bearing;
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*aadvance = longs_m->advance;
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}
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else
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{
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*abearing = ((TT_ShortMetrics*)header->short_metrics)[gindex - k];
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*aadvance = ((TT_LongMetrics)header->long_metrics)[k - 1].advance;
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}
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return SFNT_Err_Ok;
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}
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#endif /* !OPTIMIZE_MEMORY || OLD_INTERNALS */
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/* END */
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