So. Some themes have objects that seem to be large natural extensions of the landscape. Masks allow maintaining that. Lemme know if it doesn't look good. If it doesn't, can still use for ice/bounce/indestructible. Indestructible bunker object for example.
/***************************************************************************/
/* */
/* gxvtrak.c */
/* */
/* TrueTypeGX/AAT trak table validation (body). */
/* */
/* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
/* 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. */
/* */
/***************************************************************************/
/***************************************************************************/
/* */
/* gxvalid is derived from both gxlayout module and otvalid module. */
/* Development of gxlayout is supported by the Information-technology */
/* Promotion Agency(IPA), Japan. */
/* */
/***************************************************************************/
#include "gxvalid.h"
#include "gxvcommn.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_gxvtrak
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Data and Types *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*
* referred track table format specification:
* http://developer.apple.com/fonts/TTRefMan/RM06/Chap6trak.html
* last update was 1996.
* ----------------------------------------------
* [MINIMUM HEADER]: GXV_TRAK_SIZE_MIN
* version (fixed: 32bit) = 0x00010000
* format (uint16: 16bit) = 0 is only defined (1996)
* horizOffset (uint16: 16bit)
* vertOffset (uint16: 16bit)
* reserved (uint16: 16bit) = 0
* ----------------------------------------------
* [VARIABLE BODY]:
* horizData
* header ( 2 + 2 + 4
* trackTable + nTracks * ( 4 + 2 + 2 )
* sizeTable + nSizes * 4 )
* ----------------------------------------------
* vertData
* header ( 2 + 2 + 4
* trackTable + nTracks * ( 4 + 2 + 2 )
* sizeTable + nSizes * 4 )
* ----------------------------------------------
*/
typedef struct GXV_trak_DataRec_
{
FT_UShort trackValueOffset_min;
FT_UShort trackValueOffset_max;
} GXV_trak_DataRec, *GXV_trak_Data;
#define GXV_TRAK_DATA( FIELD ) GXV_TABLE_DATA( trak, FIELD )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
gxv_trak_trackTable_validate( FT_Bytes table,
FT_Bytes limit,
FT_UShort nTracks,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_Fixed track;
FT_UShort nameIndex;
FT_UShort offset;
FT_UShort i;
GXV_NAME_ENTER( "trackTable" );
GXV_TRAK_DATA( trackValueOffset_min ) = 0xFFFFU;
GXV_TRAK_DATA( trackValueOffset_max ) = 0x0000;
for ( i = 0; i < nTracks; i ++ )
{
GXV_LIMIT_CHECK( 4 + 2 + 2 );
track = FT_NEXT_LONG( p );
nameIndex = FT_NEXT_USHORT( p );
offset = FT_NEXT_USHORT( p );
if ( offset < GXV_TRAK_DATA( trackValueOffset_min ) )
GXV_TRAK_DATA( trackValueOffset_min ) = offset;
if ( offset > GXV_TRAK_DATA( trackValueOffset_max ) )
GXV_TRAK_DATA( trackValueOffset_max ) = offset;
gxv_sfntName_validate( nameIndex, 256, 32767, valid );
}
valid->subtable_length = p - table;
GXV_EXIT;
}
static void
gxv_trak_trackData_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort nTracks;
FT_UShort nSizes;
FT_ULong sizeTableOffset;
GXV_ODTECT( 4, odtect );
GXV_ODTECT_INIT( odtect );
GXV_NAME_ENTER( "trackData" );
/* read the header of trackData */
GXV_LIMIT_CHECK( 2 + 2 + 4 );
nTracks = FT_NEXT_USHORT( p );
nSizes = FT_NEXT_USHORT( p );
sizeTableOffset = FT_NEXT_ULONG( p );
gxv_odtect_add_range( table, p - table, "trackData header", odtect );
/* validate trackTable */
gxv_trak_trackTable_validate( p, limit, nTracks, valid );
gxv_odtect_add_range( p, valid->subtable_length,
"trackTable", odtect );
/* sizeTable is array of FT_Fixed, don't check contents */
p = valid->root->base + sizeTableOffset;
GXV_LIMIT_CHECK( nSizes * 4 );
gxv_odtect_add_range( p, nSizes * 4, "sizeTable", odtect );
/* validate trackValueOffet */
p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_min );
if ( limit - p < nTracks * nSizes * 2 )
GXV_TRACE(( "too short trackValue array\n" ));
p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_max );
GXV_LIMIT_CHECK( nSizes * 2 );
gxv_odtect_add_range( valid->root->base
+ GXV_TRAK_DATA( trackValueOffset_min ),
GXV_TRAK_DATA( trackValueOffset_max )
- GXV_TRAK_DATA( trackValueOffset_min )
+ nSizes * 2,
"trackValue array", odtect );
gxv_odtect_validate( odtect, valid );
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** trak TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_trak_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
FT_Bytes p = table;
FT_Bytes limit = 0;
FT_Offset table_size;
GXV_ValidatorRec validrec;
GXV_Validator valid = &validrec;
GXV_trak_DataRec trakrec;
GXV_trak_Data trak = &trakrec;
FT_ULong version;
FT_UShort format;
FT_UShort horizOffset;
FT_UShort vertOffset;
FT_UShort reserved;
GXV_ODTECT( 3, odtect );
GXV_ODTECT_INIT( odtect );
valid->root = ftvalid;
valid->table_data = trak;
valid->face = face;
limit = valid->root->limit;
table_size = limit - table;
FT_TRACE3(( "validating `trak' table\n" ));
GXV_INIT;
GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 + 2 );
version = FT_NEXT_ULONG( p );
format = FT_NEXT_USHORT( p );
horizOffset = FT_NEXT_USHORT( p );
vertOffset = FT_NEXT_USHORT( p );
reserved = FT_NEXT_USHORT( p );
GXV_TRACE(( " (version = 0x%08x)\n", version ));
GXV_TRACE(( " (format = 0x%04x)\n", format ));
GXV_TRACE(( " (horizOffset = 0x%04x)\n", horizOffset ));
GXV_TRACE(( " (vertOffset = 0x%04x)\n", vertOffset ));
GXV_TRACE(( " (reserved = 0x%04x)\n", reserved ));
/* Version 1.0 (always:1996) */
if ( version != 0x00010000UL )
FT_INVALID_FORMAT;
/* format 0 (always:1996) */
if ( format != 0x0000 )
FT_INVALID_FORMAT;
GXV_32BIT_ALIGNMENT_VALIDATE( horizOffset );
GXV_32BIT_ALIGNMENT_VALIDATE( vertOffset );
/* Reserved Fixed Value (always) */
if ( reserved != 0x0000 )
FT_INVALID_DATA;
/* validate trackData */
if ( 0 < horizOffset )
{
gxv_trak_trackData_validate( table + horizOffset, limit, valid );
gxv_odtect_add_range( table + horizOffset, valid->subtable_length,
"horizJustData", odtect );
}
if ( 0 < vertOffset )
{
gxv_trak_trackData_validate( table + vertOffset, limit, valid );
gxv_odtect_add_range( table + vertOffset, valid->subtable_length,
"vertJustData", odtect );
}
gxv_odtect_validate( odtect, valid );
FT_TRACE4(( "\n" ));
}
/* END */