psstack.c File Reference

#include "psft.h"
#include "psglue.h"
#include "psfont.h"
#include "psstack.h"
#include "pserror.h"

Include dependency graph for psstack.c:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
	cf2_stack_init (FT_Memory memory, FT_Error *e, FT_UInt stackSize)
	cf2_stack_free (CF2_Stack stack)
	cf2_stack_count (CF2_Stack stack)
	cf2_stack_pushInt (CF2_Stack stack, CF2_Int val)
	cf2_stack_pushFixed (CF2_Stack stack, CF2_Fixed val)
	cf2_stack_popInt (CF2_Stack stack)
	cf2_stack_popFixed (CF2_Stack stack)
	cf2_stack_getReal (CF2_Stack stack, CF2_UInt idx)
	cf2_stack_setReal (CF2_Stack stack, CF2_UInt idx, CF2_Fixed val)
	cf2_stack_pop (CF2_Stack stack, CF2_UInt num)
	cf2_stack_roll (CF2_Stack stack, CF2_Int count, CF2_Int shift)
	cf2_stack_clear (CF2_Stack stack)

Function Documentation

cf2_stack_clear()

cf2_stack_clear

(

CF2_Stack

stack

)

Definition at line 322 of file psstack.c.

  {
    stack->top = stack->buffer;
  }

Referenced by cf2_doFlex(), cf2_doStems(), and cf2_interpT2CharString().

cf2_stack_count()

cf2_stack_count

(

CF2_Stack

stack

)

Definition at line 100 of file psstack.c.

  {
    return (CF2_UInt)( stack->top - stack->buffer );
  }

Referenced by cf2_doBlend(), cf2_doStems(), cf2_interpT2CharString(), cf2_stack_getReal(), cf2_stack_pop(), cf2_stack_roll(), and cf2_stack_setReal().

cf2_stack_free()

cf2_stack_free

(

CF2_Stack

stack

)

Definition at line 84 of file psstack.c.

  {
    if ( stack )
    {
      FT_Memory  memory = stack->memory;
 
      /* free the buffer */
      FT_FREE( stack->buffer );
 
      /* free the main structure */
      FT_FREE( stack );
    }
  }

Referenced by cf2_interpT2CharString().

cf2_stack_getReal()

cf2_stack_getReal	(	CF2_Stack	stack,
		CF2_UInt	idx
	)

Definition at line 187 of file psstack.c.

  {
    FT_ASSERT( cf2_stack_count( stack ) <= stack->stackSize );
 
    if ( idx >= cf2_stack_count( stack ) )
    {
      CF2_SET_ERROR( stack->error, Stack_Overflow );
      return cf2_intToFixed( 0 );    /* bounds error */
    }
 
    switch ( stack->buffer[idx].type )
    {
    case CF2_NumberInt:
      return cf2_intToFixed( stack->buffer[idx].u.i );
    case CF2_NumberFrac:
      return cf2_fracToFixed( stack->buffer[idx].u.f );
    default:
      return stack->buffer[idx].u.r;
    }
  }

Referenced by cf2_doBlend(), cf2_doFlex(), cf2_doStems(), and cf2_interpT2CharString().

cf2_stack_init()

cf2_stack_init	(	FT_Memory	memory,
		FT_Error *	e,
		FT_UInt	stackSize
	)

Definition at line 53 of file psstack.c.

  {
    FT_Error  error = FT_Err_Ok;     /* for FT_NEW */
 
    CF2_Stack  stack = NULL;
 
 
    if ( !FT_NEW( stack ) )
    {
      /* initialize the structure; FT_NEW zeroes it */
      stack->memory = memory;
      stack->error  = e;
    }
 
    /* allocate the stack buffer */
    if ( FT_NEW_ARRAY( stack->buffer, stackSize ) )
    {
      FT_FREE( stack );
      return NULL;
    }
 
    stack->stackSize = stackSize;
    stack->top       = stack->buffer;     /* empty stack */
 
    return stack;
  }

Referenced by cf2_interpT2CharString().

cf2_stack_pop()

cf2_stack_pop	(	CF2_Stack	stack,
		CF2_UInt	num
	)

Definition at line 229 of file psstack.c.

  {
    if ( num > cf2_stack_count( stack ) )
    {
      CF2_SET_ERROR( stack->error, Stack_Underflow );
      return;
    }
    stack->top -= num;
  }

Referenced by cf2_doBlend(), and cf2_interpT2CharString().

cf2_stack_popFixed()

cf2_stack_popFixed

(

CF2_Stack

stack

)

Definition at line 162 of file psstack.c.

  {
    if ( stack->top == stack->buffer )
    {
      CF2_SET_ERROR( stack->error, Stack_Underflow );
      return cf2_intToFixed( 0 );    /* underflow */
    }
 
    stack->top--;
 
    switch ( stack->top->type )
    {
    case CF2_NumberInt:
      return cf2_intToFixed( stack->top->u.i );
    case CF2_NumberFrac:
      return cf2_fracToFixed( stack->top->u.f );
    default:
      return stack->top->u.r;
    }
  }

Referenced by cf2_interpT2CharString().

cf2_stack_popInt()

cf2_stack_popInt

(

CF2_Stack

stack

)

Definition at line 140 of file psstack.c.

  {
    if ( stack->top == stack->buffer )
    {
      CF2_SET_ERROR( stack->error, Stack_Underflow );
      return 0;   /* underflow */
    }
    if ( stack->top[-1].type != CF2_NumberInt )
    {
      CF2_SET_ERROR( stack->error, Syntax_Error );
      return 0;   /* type mismatch */
    }
 
    stack->top--;
 
    return stack->top->u.i;
  }

Referenced by cf2_interpT2CharString().

cf2_stack_pushFixed()

cf2_stack_pushFixed	(	CF2_Stack	stack,
		CF2_Fixed	val
	)

Definition at line 123 of file psstack.c.

  {
    if ( stack->top == stack->buffer + stack->stackSize )
    {
      CF2_SET_ERROR( stack->error, Stack_Overflow );
      return;     /* stack overflow */
    }
 
    stack->top->u.r  = val;
    stack->top->type = CF2_NumberFixed;
    stack->top++;
  }

Referenced by cf2_interpT2CharString().

cf2_stack_pushInt()

cf2_stack_pushInt	(	CF2_Stack	stack,
		CF2_Int	val
	)

Definition at line 107 of file psstack.c.

  {
    if ( stack->top == stack->buffer + stack->stackSize )
    {
      CF2_SET_ERROR( stack->error, Stack_Overflow );
      return;     /* stack overflow */
    }
 
    stack->top->u.i  = val;
    stack->top->type = CF2_NumberInt;
    stack->top++;
  }

Referenced by cf2_interpT2CharString().

cf2_stack_roll()

cf2_stack_roll	(	CF2_Stack	stack,
		CF2_Int	count,
		CF2_Int	shift
	)

Definition at line 242 of file psstack.c.

  {
    /* we initialize this variable to avoid compiler warnings */
    CF2_StackNumber  last = { { 0 }, CF2_NumberInt };
 
    CF2_Int  start_idx, idx, i;
 
 
    if ( count < 2 )
      return; /* nothing to do (values 0 and 1), or undefined value */
 
    if ( (CF2_UInt)count > cf2_stack_count( stack ) )
    {
      CF2_SET_ERROR( stack->error, Stack_Overflow );
      return;
    }
 
    if ( shift < 0 )
      shift = -( ( -shift ) % count );
    else
      shift %= count;
 
    if ( shift == 0 )
      return; /* nothing to do */
 
    /* We use the following algorithm to do the rolling, */
    /* which needs two temporary variables only.         */
    /*                                                   */
    /* Example:                                          */
    /*                                                   */
    /*   count = 8                                       */
    /*   shift = 2                                       */
    /*                                                   */
    /*   stack indices before roll:  7 6 5 4 3 2 1 0     */
    /*   stack indices after roll:   1 0 7 6 5 4 3 2     */
    /*                                                   */
    /* The value of index 0 gets moved to index 2, while */
    /* the old value of index 2 gets moved to index 4,   */
    /* and so on.  We thus have the following copying    */
    /* chains for shift value 2.                         */
    /*                                                   */
    /*   0 -> 2 -> 4 -> 6 -> 0                           */
    /*   1 -> 3 -> 5 -> 7 -> 1                           */
    /*                                                   */
    /* If `count' and `shift' are incommensurable, we    */
    /* have a single chain only.  Otherwise, increase    */
    /* the start index by 1 after the first chain, then  */
    /* do the next chain until all elements in all       */
    /* chains are handled.                               */
 
    start_idx = -1;
    idx       = -1;
    for ( i = 0; i < count; i++ )
    {
      CF2_StackNumber  tmp;
 
 
      if ( start_idx == idx )
      {
        start_idx++;
        idx  = start_idx;
        last = stack->buffer[idx];
      }
 
      idx += shift;
      if ( idx >= count )
        idx -= count;
      else if ( idx < 0 )
        idx += count;
 
      tmp                = stack->buffer[idx];
      stack->buffer[idx] = last;
      last               = tmp;
    }
  }

Referenced by cf2_interpT2CharString().

cf2_stack_setReal()

cf2_stack_setReal	(	CF2_Stack	stack,
		CF2_UInt	idx,
		CF2_Fixed	val
	)

Definition at line 212 of file psstack.c.

  {
    if ( idx > cf2_stack_count( stack ) )
    {
      CF2_SET_ERROR( stack->error, Stack_Overflow );
      return;
    }
 
    stack->buffer[idx].u.r  = val;
    stack->buffer[idx].type = CF2_NumberFixed;
  }

Referenced by cf2_doBlend(), and cf2_interpT2CharString().