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/* Copyright (C) 1997, 1998, 1999 Aladdin Enterprises. All rights reserved.
* This software is licensed to a single customer by Artifex Software Inc.
* under the terms of a specific OEM agreement.
*/
/*$RCSfile$ $Revision$ */
/* Generic PostScript language interface to Functions */
#include "memory_.h"
#include "ghost.h"
#include "oper.h"
#include "gscdefs.h"
#include "gsfunc.h"
#include "gsstruct.h"
#include "ialloc.h"
#include "idict.h"
#include "idparam.h"
#include "ifunc.h"
#include "store.h"
/* Define the maximum depth of nesting of subsidiary functions. */
#define MAX_SUB_FUNCTION_DEPTH 3
/* GC descriptors */
gs_private_st_ptr(st_function_ptr, gs_function_t *, "gs_function_t *",
function_ptr_enum_ptrs, function_ptr_reloc_ptrs);
gs_private_st_element(st_function_ptr_element, gs_function_t *,
"gs_function_t *[]", function_ptr_element_enum_ptrs,
function_ptr_element_reloc_ptrs, st_function_ptr);
/* ------ Operators ------ */
private int zexecfunction(P1(i_ctx_t *));
/* <dict> .buildfunction <function_struct> */
private int
zbuildfunction(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
gs_function_t *pfn;
ref cref; /* closure */
int code;
code = ialloc_ref_array(&cref, a_executable | a_execute, 2,
".buildfunction");
if (code < 0)
return code;
code = fn_build_function(op, &pfn, imemory);
if (code < 0) {
ifree_ref_array(&cref, ".buildfunction");
return code;
}
make_istruct_new(cref.value.refs, a_executable | a_execute, pfn);
make_oper_new(cref.value.refs + 1, 0, zexecfunction);
ref_assign(op, &cref);
return 0;
}
/* <in1> ... <function_struct> %execfunction <out1> ... */
private int
zexecfunction(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
/*
* Since this operator's name begins with %, the name is not defined
* in systemdict. The only place this operator can ever appear is
* in the execute-only closure created by .buildfunction.
* Therefore, in principle it is unnecessary to check the argument.
* However, we do a little checking anyway just on general
* principles. Note that since the argument may be an instance of
* any subclass of gs_function_t, we currently have no way to check
* its type.
*/
if (!r_is_struct(op) ||
r_has_masked_attrs(op, a_executable | a_execute, a_all)
)
return_error(e_typecheck);
{
gs_function_t *pfn = (gs_function_t *) op->value.pstruct;
int m = pfn->params.m, n = pfn->params.n;
int diff = n - (m + 1);
if (diff > 0)
check_ostack(diff);
{
float *in = (float *)ialloc_byte_array(m, sizeof(float),
"%execfunction(in)");
float *out = (float *)ialloc_byte_array(n, sizeof(float),
"%execfunction(out)");
int code;
if (in == 0 || out == 0)
code = gs_note_error(e_VMerror);
else if ((code = float_params(op - 1, m, in)) < 0 ||
(code = gs_function_evaluate(pfn, in, out)) < 0
)
DO_NOTHING;
else {
if (diff > 0)
push(diff); /* can't fail */
else if (diff < 0) {
pop(-diff);
op = osp;
}
code = make_floats(op + 1 - n, out, n);
}
ifree_object(out, "%execfunction(out)");
ifree_object(in, "%execfunction(in)");
return code;
}
}
}
/* ------ Procedures ------ */
/* Build a function structure from a PostScript dictionary. */
int
fn_build_function(const ref * op, gs_function_t ** ppfn, gs_memory_t *mem)
{
return fn_build_sub_function(op, ppfn, 0, mem);
}
int
fn_build_sub_function(const ref * op, gs_function_t ** ppfn, int depth,
gs_memory_t *mem)
{
int code, type, i;
gs_function_params_t params;
if (depth > MAX_SUB_FUNCTION_DEPTH)
return_error(e_limitcheck);
check_type(*op, t_dictionary);
code = dict_int_param(op, "FunctionType", 0, max_int, -1, &type);
if (code < 0)
return code;
for (i = 0; i < build_function_type_table_count; ++i)
if (build_function_type_table[i].type == type)
break;
if (i == build_function_type_table_count)
return_error(e_rangecheck);
/* Collect parameters common to all function types. */
params.Domain = 0;
params.Range = 0;
code = fn_build_float_array(op, "Domain", true, true, ¶ms.Domain, mem);
if (code < 0)
goto fail;
params.m = code >> 1;
code = fn_build_float_array(op, "Range", false, true, ¶ms.Range, mem);
if (code < 0)
goto fail;
params.n = code >> 1;
/* Finish building the function. */
/* If this fails, it will free all the parameters. */
return (*build_function_type_table[i].proc)
(op, ¶ms, depth + 1, ppfn, mem);
fail:
gs_free_const_object(mem, params.Range, "Range");
gs_free_const_object(mem, params.Domain, "Domain");
return code;
}
/* Allocate an array of function objects. */
int
alloc_function_array(uint count, gs_function_t *** pFunctions,
gs_memory_t *mem)
{
gs_function_t **ptr;
if (count == 0)
return_error(e_rangecheck);
ptr = gs_alloc_struct_array(mem, count, gs_function_t *,
&st_function_ptr_element, "Functions");
if (ptr == 0)
return_error(e_VMerror);
memset(ptr, 0, sizeof(*ptr) * count);
*pFunctions = ptr;
return 0;
}
/*
* Collect a heap-allocated array of floats. If the key is missing, set
* *pparray = 0 and return 0; otherwise set *pparray and return the number
* of elements. Note that 0-length arrays are acceptable, so if the value
* returned is 0, the caller must check whether *pparray == 0.
*/
int
fn_build_float_array(const ref * op, const char *kstr, bool required,
bool even, const float **pparray, gs_memory_t *mem)
{
ref *par;
int code;
*pparray = 0;
if (dict_find_string(op, kstr, &par) <= 0)
return (required ? gs_note_error(e_rangecheck) : 0);
if (!r_is_array(par))
return_error(e_typecheck);
{
uint size = r_size(par);
float *ptr = (float *)
gs_alloc_byte_array(mem, size, sizeof(float), kstr);
if (ptr == 0)
return_error(e_VMerror);
code = dict_float_array_param(op, kstr, size, ptr, NULL);
if (code < 0 || (even && (code & 1) != 0)) {
gs_free_object(mem, ptr, kstr);
return(code < 0 ? code : gs_note_error(e_rangecheck));
}
*pparray = ptr;
}
return code;
}
/* ------ Initialization procedure ------ */
const op_def zfunc_op_defs[] =
{
{"1.buildfunction", zbuildfunction},
{"1%execfunction", zexecfunction},
op_def_end(0)
};
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