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/*
*
* (C) Copyright IBM Corp. and others 1998-2013 - All Rights Reserved
*
*/
#ifndef __STATETABLES_H
#define __STATETABLES_H
/**
* \file
* \internal
*/
#include "LETypes.h"
#include "LayoutTables.h"
U_NAMESPACE_BEGIN
/*
* State table loop detection.
* Detects if too many ( LE_STATE_PATIENCE_COUNT ) state changes occur without moving the glyph index 'g'.
*
* Usage (pseudocode):
*
* {
* LE_STATE_PATIENCE_INIT();
*
* int g=0; // the glyph index - expect it to be moving
*
* for(;;) {
* if(LE_STATE_PATIENCE_DECR()) { // decrements the patience counter
* // ran out of patience, get out.
* break;
* }
*
* LE_STATE_PATIENCE_CURR(int, g); // store the 'current'
* state = newState(state,g);
* g+= <something, could be zero>;
* LE_STATE_PATIENCE_INCR(g); // if g has moved, increment the patience counter. Otherwise leave it.
* }
*
*/
#define LE_STATE_PATIENCE_COUNT 4096 /**< give up if a state table doesn't move the glyph after this many iterations */
#define LE_STATE_PATIENCE_INIT() le_uint32 le_patience_count = LE_STATE_PATIENCE_COUNT
#define LE_STATE_PATIENCE_DECR() --le_patience_count==0
#define LE_STATE_PATIENCE_CURR(type,x) type le_patience_curr=(x)
#define LE_STATE_PATIENCE_INCR(x) if((x)!=le_patience_curr) ++le_patience_count;
struct StateTableHeader
{
le_int16 stateSize;
ByteOffset classTableOffset;
ByteOffset stateArrayOffset;
ByteOffset entryTableOffset;
};
struct StateTableHeader2
{
le_uint32 nClasses;
le_uint32 classTableOffset;
le_uint32 stateArrayOffset;
le_uint32 entryTableOffset;
};
enum ClassCodes
{
classCodeEOT = 0,
classCodeOOB = 1,
classCodeDEL = 2,
classCodeEOL = 3,
classCodeFirstFree = 4,
classCodeMAX = 0xFF
};
typedef le_uint8 ClassCode;
struct ClassTable
{
TTGlyphID firstGlyph;
le_uint16 nGlyphs;
ClassCode classArray[ANY_NUMBER];
};
LE_VAR_ARRAY(ClassTable, classArray)
enum StateNumber
{
stateSOT = 0,
stateSOL = 1,
stateFirstFree = 2,
stateMAX = 0xFF
};
typedef le_uint8 EntryTableIndex;
struct StateEntry
{
ByteOffset newStateOffset;
le_int16 flags;
};
typedef le_uint16 EntryTableIndex2;
struct StateEntry2 // same struct different interpretation
{
le_uint16 newStateIndex;
le_uint16 flags;
};
U_NAMESPACE_END
#endif
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