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+//========================================================================
+//
+// Function.h
+//
+// Copyright 2001-2002 Glyph & Cog, LLC
+//
+//========================================================================
+
+#ifndef FUNCTION_H
+#define FUNCTION_H
+
+#ifdef __GNUC__
+#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