198 lines
7.8 KiB
C
198 lines
7.8 KiB
C
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/***************************************************************************/
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/* */
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/* gxvmorx5.c */
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/* */
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/* TrueTypeGX/AAT morx table validation */
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/* body for type5 (Contextual Glyph Insertion) subtable. */
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/* */
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/* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
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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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/***************************************************************************/
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/* gxvalid is derived from both gxlayout module and otvalid module. */
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/* Development of gxlayout was support of Information-technology Promotion */
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/* Agency(IPA), Japan. */
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/***************************************************************************/
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#include "gxvmorx.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_gxvmorx
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/*
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* morx subtable type5 (Contextual Glyph Insertion)
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* has format of StateTable with insertion-glyph-list
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* without name. however, 32bit offset from the head
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* of subtable to the i-g-l is given after "entryTable",
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* without variable name specification (the exist of
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* offset to the table is different from mort type5).
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*/
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typedef struct GXV_morx_subtable_type5_StateOptRec_
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{
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FT_ULong insertionGlyphList;
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FT_ULong insertionGlyphList_length;
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} GXV_morx_subtable_type5_StateOptRec,
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*GXV_morx_subtable_type5_StateOptRecData;
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#define GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE ( GXV_STATETABLE_HEADER_SIZE + 4 )
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static void
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gxv_morx_subtable_type5_insertionGlyphList_load( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bytes p = table;
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GXV_morx_subtable_type5_StateOptRecData optdata = valid->xstatetable.optdata;
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GXV_LIMIT_CHECK( 4 );
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optdata->insertionGlyphList = FT_NEXT_ULONG( p );
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}
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static void
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gxv_morx_subtable_type5_subtable_setup( FT_ULong table_size,
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FT_ULong classTable,
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FT_ULong stateArray,
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FT_ULong entryTable,
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FT_ULong* classTable_length_p,
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FT_ULong* stateArray_length_p,
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FT_ULong* entryTable_length_p,
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GXV_Validator valid )
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{
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FT_ULong o[4];
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FT_ULong* l[4];
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FT_ULong buff[5];
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GXV_morx_subtable_type5_StateOptRecData optdata = valid->xstatetable.optdata;
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o[0] = classTable;
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o[1] = stateArray;
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o[2] = entryTable;
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o[3] = optdata->insertionGlyphList;
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l[0] = classTable_length_p;
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l[1] = stateArray_length_p;
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l[2] = entryTable_length_p;
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l[3] = &(optdata->insertionGlyphList_length);
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gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
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}
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static void
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gxv_morx_subtable_type5_InsertList_validate( FT_UShort index,
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FT_UShort count,
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FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bytes p = table + ( index * 2 );
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while ( p < table + ( count * 2 ) + ( index * 2 ) )
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{
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FT_UShort insert_glyphID;
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GXV_LIMIT_CHECK( 2 );
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insert_glyphID = FT_NEXT_USHORT( p );
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GXV_TRACE(( " 0x%04x", insert_glyphID ));
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}
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GXV_TRACE(( "\n" ));
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}
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static void
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gxv_morx_subtable_type5_entry_validate( FT_UShort state,
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FT_UShort flags,
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GXV_StateTable_GlyphOffsetDesc
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glyphOffset,
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FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bool setMark;
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FT_Bool dontAdvance;
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FT_Bool currentIsKashidaLike;
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FT_Bool markedIsKashidaLike;
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FT_Bool currentInsertBefore;
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FT_Bool markedInsertBefore;
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FT_Bool currentInsertCount;
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FT_Byte markedInsertCount;
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FT_Byte currentInsertList;
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FT_UShort markedInsertList;
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setMark = ( flags >> 15 ) & 1;
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dontAdvance = ( flags >> 14 ) & 1;
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currentIsKashidaLike = ( flags >> 13 ) & 1;
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markedIsKashidaLike = ( flags >> 12 ) & 1;
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currentInsertBefore = ( flags >> 11 ) & 1;
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markedInsertBefore = ( flags >> 10 ) & 1;
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currentInsertCount = ( flags & 0x03E0 ) / 0x20;
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markedInsertCount = ( flags & 0x001F );
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currentInsertList = glyphOffset.ul / 0x00010000;
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markedInsertList = glyphOffset.ul & 0x0000FFFF;
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if ( currentInsertList && 0 != currentInsertCount )
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{
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gxv_morx_subtable_type5_InsertList_validate( currentInsertList,
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currentInsertCount,
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table, limit,
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valid );
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}
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if ( markedInsertList && 0 != markedInsertCount )
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{
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gxv_morx_subtable_type5_InsertList_validate( markedInsertList,
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markedInsertCount,
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table, limit,
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valid );
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}
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}
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static void
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gxv_morx_subtable_type5_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator valid )
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{
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FT_Bytes p = table;
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GXV_morx_subtable_type5_StateOptRec et_rec;
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GXV_morx_subtable_type5_StateOptRecData et = &et_rec;
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GXV_NAME_ENTER( "morx chain subtable type5 (Glyph Insertion)" );
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GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE );
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valid->xstatetable.optdata = et;
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valid->xstatetable.optdata_load_func = gxv_morx_subtable_type5_insertionGlyphList_load;
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valid->xstatetable.subtable_setup_func = gxv_morx_subtable_type5_subtable_setup;
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valid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_ULONG;
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valid->xstatetable.entry_validate_func = gxv_morx_subtable_type5_entry_validate;
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gxv_XStateTable_validate( p, limit, valid );
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GXV_EXIT;
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}
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/* END */
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