kc3-lang/freetype/src/cff/cf2stack.c

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• Hash : 283c8ed8
  Author :
  Date : 2013-04-13T15:02:31
  

  [cff] New files for Adobe's Type 2 interpreter and hinting engine.

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• src/cff/cf2stack.c

• /***************************************************************************/
  /*                                                                         */
  /*  cf2stack.c                                                             */
  /*                                                                         */
  /*    Adobe's code for emulating a CFF stack (body).                       */
  /*                                                                         */
  /*  Copyright 2007-2013 Adobe Systems Incorporated.                        */
  /*                                                                         */
  /*  This software, and all works of authorship, whether in source or       */
  /*  object code form as indicated by the copyright notice(s) included      */
  /*  herein (collectively, the "Work") is made available, and may only be   */
  /*  used, modified, and distributed under the FreeType Project License,    */
  /*  LICENSE.TXT.  Additionally, subject to the terms and conditions of the */
  /*  FreeType Project License, each contributor to the Work hereby grants   */
  /*  to any individual or legal entity exercising permissions granted by    */
  /*  the FreeType Project License and this section (hereafter, "You" or     */
  /*  "Your") a perpetual, worldwide, non-exclusive, no-charge,              */
  /*  royalty-free, irrevocable (except as stated in this section) patent    */
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  /*                                                                         */
  /*  By using, modifying, or distributing the Work you indicate that you    */
  /*  have read and understood the terms and conditions of the               */
  /*  FreeType Project License as well as those provided in this section,    */
  /*  and you accept them fully.                                             */
  /*                                                                         */
  /***************************************************************************/
  
  
  #include "cf2ft.h"
  #include FT_INTERNAL_DEBUG_H
  
  #include "cf2glue.h"
  #include "cf2font.h"
  #include "cf2stack.h"
  
  #include "cf2error.h"
  
  
    /* Allocate and initialize an instance of CF2_Stack.       */
    /* Note: This function returns NULL on error (does not set */
    /* `error').                                               */
    FT_LOCAL_DEF( CF2_Stack )
    cf2_stack_init( FT_Memory  memory,
                    FT_Error*  e )
    {
      FT_Error  error = FT_Err_Ok;     /* for FT_QNEW */
  
      CF2_Stack  stack = NULL;
  
  
      if ( !FT_QNEW( stack ) )
      {
        /* initialize the structure; FT_QNEW zeroes it */
        stack->memory = memory;
        stack->error  = e;
        stack->top    = &stack->buffer[0]; /* empty stack */
      }
  
      return stack;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_stack_free( CF2_Stack  stack )
    {
      if ( stack )
      {
        FT_Memory  memory = stack->memory;
  
  
        /* free the main structure */
        FT_FREE( stack );
      }
    }
  
  
    FT_LOCAL_DEF( CF2_UInt )
    cf2_stack_count( CF2_Stack  stack )
    {
      return (CF2_UInt)( stack->top - &stack->buffer[0] );
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_stack_pushInt( CF2_Stack  stack,
                       CF2_Int    val )
    {
      if ( stack->top == &stack->buffer[CF2_OPERAND_STACK_SIZE] )
      {
        CF2_SET_ERROR( stack->error, Stack_Overflow );
        return;     /* stack overflow */
      }
  
      stack->top->u.i  = val;
      stack->top->type = CF2_NumberInt;
      ++stack->top;
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_stack_pushFixed( CF2_Stack  stack,
                         CF2_Fixed  val )
    {
      if ( stack->top == &stack->buffer[CF2_OPERAND_STACK_SIZE] )
      {
        CF2_SET_ERROR( stack->error, Stack_Overflow );
        return;     /* stack overflow */
      }
  
      stack->top->u.r  = val;
      stack->top->type = CF2_NumberFixed;
      ++stack->top;
    }
  
  
    /* this function is only allowed to pop an integer type */
    FT_LOCAL_DEF( CF2_Int )
    cf2_stack_popInt( CF2_Stack  stack )
    {
      if ( stack->top == &stack->buffer[0] )
      {
        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;
    }
  
  
    /* Note: type mismatch is silently cast */
    /* TODO: check this */
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_stack_popFixed( CF2_Stack  stack )
    {
      if ( stack->top == &stack->buffer[0] )
      {
        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;
      }
    }
  
  
    /* Note: type mismatch is silently cast */
    /* TODO: check this */
    FT_LOCAL_DEF( CF2_Fixed )
    cf2_stack_getReal( CF2_Stack  stack,
                       CF2_UInt   idx )
    {
      FT_ASSERT( cf2_stack_count( stack ) <= CF2_OPERAND_STACK_SIZE );
  
      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;
      }
    }
  
  
    FT_LOCAL_DEF( void )
    cf2_stack_clear( CF2_Stack  stack )
    {
      stack->top = &stack->buffer[0];
    }
  
  
  /* END */
  

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