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// -*- C++ -*-
//========================================================================
//
// Function.h
//
// Copyright 2001-2002 Glyph & Cog, LLC
//
//========================================================================
#ifndef FUNCTION_H
#define FUNCTION_H
#include "aconf.h"
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "gtypes.h"
#include "object.h"
class Dict;
class Stream;
struct PSObject;
class PSStack;
//------------------------------------------------------------------------
// Function
//------------------------------------------------------------------------
#define funcMaxInputs 8
#define funcMaxOutputs 8
class Function {
public:
Function();
virtual ~Function();
// Construct a function. Returns NULL if unsuccessful.
static Function *parse(Object *funcObj);
// Initialize the entries common to all function types.
GBool init(Dict *dict);
virtual Function *copy() = 0;
// Return size of input and output tuples.
int getInputSize() { return m; }
int getOutputSize() { return n; }
// Transform an input tuple into an output tuple.
virtual void transform(double *in, double *out) = 0;
virtual GBool isOk() = 0;
protected:
int m, n; // size of input and output tuples
double // min and max values for function domain
domain[funcMaxInputs][2];
double // min and max values for function range
range[funcMaxOutputs][2];
GBool hasRange; // set if range is defined
};
//------------------------------------------------------------------------
// IdentityFunction
//------------------------------------------------------------------------
class IdentityFunction: public Function {
public:
IdentityFunction();
virtual ~IdentityFunction();
virtual Function *copy() { return new IdentityFunction(); }
virtual void transform(double *in, double *out);
virtual GBool isOk() { return gTrue; }
private:
};
//------------------------------------------------------------------------
// SampledFunction
//------------------------------------------------------------------------
class SampledFunction: public Function {
public:
SampledFunction(Object *funcObj, Dict *dict);
virtual ~SampledFunction();
virtual Function *copy() { return new SampledFunction(this); }
virtual void transform(double *in, double *out);
virtual GBool isOk() { return ok; }
private:
SampledFunction(SampledFunction *func);
int // number of samples for each domain element
sampleSize[funcMaxInputs];
double // min and max values for domain encoder
encode[funcMaxInputs][2];
double // min and max values for range decoder
decode[funcMaxOutputs][2];
double *samples; // the samples
GBool ok;
};
//------------------------------------------------------------------------
// ExponentialFunction
//------------------------------------------------------------------------
class ExponentialFunction: public Function {
public:
ExponentialFunction(Object *funcObj, Dict *dict);
virtual ~ExponentialFunction();
virtual Function *copy() { return new ExponentialFunction(this); }
virtual void transform(double *in, double *out);
virtual GBool isOk() { return ok; }
private:
ExponentialFunction(ExponentialFunction *func);
double c0[funcMaxOutputs];
double c1[funcMaxOutputs];
double e;
GBool ok;
};
//------------------------------------------------------------------------
// StitchingFunction
//------------------------------------------------------------------------
class StitchingFunction: public Function {
public:
StitchingFunction(Object *funcObj, Dict *dict);
virtual ~StitchingFunction();
virtual Function *copy() { return new StitchingFunction(this); }
virtual void transform(double *in, double *out);
virtual GBool isOk() { return ok; }
private:
StitchingFunction(StitchingFunction *func);
int k;
Function **funcs;
double *bounds;
double *encode;
GBool ok;
};
//------------------------------------------------------------------------
// PostScriptFunction
//------------------------------------------------------------------------
class PostScriptFunction: public Function {
public:
PostScriptFunction(Object *funcObj, Dict *dict);
virtual ~PostScriptFunction();
virtual Function *copy() { return new PostScriptFunction(this); }
virtual void transform(double *in, double *out);
virtual GBool isOk() { return ok; }
private:
PostScriptFunction(PostScriptFunction *func);
GBool parseCode(Stream *str, int *codePtr);
GString *getToken(Stream *str);
void resizeCode(int newSize);
void exec(PSStack *stack, int codePtr);
PSObject *code;
int codeSize;
GBool ok;
};
#endif
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