source/libs/poppler/poppler-src/poppler/Function.h

   1 //========================================================================
   2 //
   3 // Function.h
   4 //
   5 // Copyright 2001-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 //========================================================================
  10 //
  11 // Modified under the Poppler project - http://poppler.freedesktop.org
  12 //
  13 // All changes made under the Poppler project to this file are licensed
  14 // under GPL version 2 or later
  15 //
  16 // Copyright (C) 2009, 2010 Albert Astals Cid <aacid@kde.org>
  17 // Copyright (C) 2010 Christian Feuersänger <cfeuersaenger@googlemail.com>
  18 // Copyright (C) 2011 Andrea Canciani <ranma42@gmail.com>
  19 // Copyright (C) 2012 Thomas Freitag <Thomas.Freitag@alfa.de>
  20 // Copyright (C) 2012 Adam Reichold <adamreichold@myopera.com>
  21 //
  22 // To see a description of the changes please see the Changelog file that
  23 // came with your tarball or type make ChangeLog if you are building from git
  24 //
  25 //========================================================================
  26
  27 #ifndef FUNCTION_H
  28 #define FUNCTION_H
  29
  30 #ifdef USE_GCC_PRAGMAS
  31 #pragma interface
  32 #endif
  33
  34 #include "goo/gtypes.h"
  35 #include "Object.h"
  36 #include <set>
  37
  38 class Dict;
  39 class Stream;
  40 struct PSObject;
  41 class PSStack;
  42 class PopplerCache;
  43
  44 //------------------------------------------------------------------------
  45 // Function
  46 //------------------------------------------------------------------------
  47
  48 #define funcMaxInputs        32
  49 #define funcMaxOutputs       32
  50 #define sampledFuncMaxInputs 16
  51
  52 class Function {
  53 public:
  54
  55   Function();
  56
  57   virtual ~Function();
  58
  59   // Construct a function.  Returns NULL if unsuccessful.
  60   static Function *parse(Object *funcObj);
  61
  62   // Initialize the entries common to all function types.
  63   GBool init(Dict *dict);
  64
  65   virtual Function *copy() = 0;
  66
  67   // Return the function type:
  68   //   -1 : identity
  69   //    0 : sampled
  70   //    2 : exponential
  71   //    3 : stitching
  72   //    4 : PostScript
  73   virtual int getType() = 0;
  74
  75   // Return size of input and output tuples.
  76   int getInputSize() { return m; }
  77   int getOutputSize() { return n; }
  78
  79   double getDomainMin(int i) { return domain[i][0]; }
  80   double getDomainMax(int i) { return domain[i][1]; }
  81   double getRangeMin(int i) { return range[i][0]; }
  82   double getRangeMax(int i) { return range[i][1]; }
  83   GBool getHasRange() { return hasRange; }
  84   virtual GBool hasDifferentResultSet(Function *func) { return gFalse; }
  85
  86   // Transform an input tuple into an output tuple.
  87   virtual void transform(double *in, double *out) = 0;
  88
  89   virtual GBool isOk() = 0;
  90
  91 protected:
  92   static Function *parse(Object *funcObj, std::set<int> *usedParents);
  93
  94   Function(const Function *func);
  95
  96   int m, n;                     // size of input and output tuples
  97   double                        // min and max values for function domain
  98     domain[funcMaxInputs][2];
  99   double                        // min and max values for function range
 100     range[funcMaxOutputs][2];
 101   GBool hasRange;               // set if range is defined
 102 };
 103
 104 //------------------------------------------------------------------------
 105 // IdentityFunction
 106 //------------------------------------------------------------------------
 107
 108 class IdentityFunction: public Function {
 109 public:
 110
 111   IdentityFunction();
 112   virtual ~IdentityFunction();
 113   virtual Function *copy() { return new IdentityFunction(); }
 114   virtual int getType() { return -1; }
 115   virtual void transform(double *in, double *out);
 116   virtual GBool isOk() { return gTrue; }
 117
 118 private:
 119 };
 120
 121 //------------------------------------------------------------------------
 122 // SampledFunction
 123 //------------------------------------------------------------------------
 124
 125 class SampledFunction: public Function {
 126 public:
 127
 128   SampledFunction(Object *funcObj, Dict *dict);
 129   virtual ~SampledFunction();
 130   virtual Function *copy() { return new SampledFunction(this); }
 131   virtual int getType() { return 0; }
 132   virtual void transform(double *in, double *out);
 133   virtual GBool isOk() { return ok; }
 134   virtual GBool hasDifferentResultSet(Function *func);
 135
 136   int getSampleSize(int i) { return sampleSize[i]; }
 137   double getEncodeMin(int i) { return encode[i][0]; }
 138   double getEncodeMax(int i) { return encode[i][1]; }
 139   double getDecodeMin(int i) { return decode[i][0]; }
 140   double getDecodeMax(int i) { return decode[i][1]; }
 141   double *getSamples() { return samples; }
 142   int getSampleNumber() { return nSamples; }
 143
 144 private:
 145
 146   SampledFunction(const SampledFunction *func);
 147
 148   int                           // number of samples for each domain element
 149     sampleSize[funcMaxInputs];
 150   double                        // min and max values for domain encoder
 151     encode[funcMaxInputs][2];
 152   double                        // min and max values for range decoder
 153     decode[funcMaxOutputs][2];
 154   double                        // input multipliers
 155     inputMul[funcMaxInputs];
 156   int *idxOffset;
 157   double *samples;              // the samples
 158   int nSamples;                 // size of the samples array
 159   double *sBuf;                 // buffer for the transform function
 160   double cacheIn[funcMaxInputs];
 161   double cacheOut[funcMaxOutputs];
 162   GBool ok;
 163 };
 164
 165 //------------------------------------------------------------------------
 166 // ExponentialFunction
 167 //------------------------------------------------------------------------
 168
 169 class ExponentialFunction: public Function {
 170 public:
 171
 172   ExponentialFunction(Object *funcObj, Dict *dict);
 173   virtual ~ExponentialFunction();
 174   virtual Function *copy() { return new ExponentialFunction(this); }
 175   virtual int getType() { return 2; }
 176   virtual void transform(double *in, double *out);
 177   virtual GBool isOk() { return ok; }
 178
 179   double *getC0() { return c0; }
 180   double *getC1() { return c1; }
 181   double getE() { return e; }
 182
 183 private:
 184
 185   ExponentialFunction(const ExponentialFunction *func);
 186
 187   double c0[funcMaxOutputs];
 188   double c1[funcMaxOutputs];
 189   double e;
 190   bool isLinear;
 191   GBool ok;
 192 };
 193
 194 //------------------------------------------------------------------------
 195 // StitchingFunction
 196 //------------------------------------------------------------------------
 197
 198 class StitchingFunction: public Function {
 199 public:
 200
 201   StitchingFunction(Object *funcObj, Dict *dict, std::set<int> *usedParents);
 202   virtual ~StitchingFunction();
 203   virtual Function *copy() { return new StitchingFunction(this); }
 204   virtual int getType() { return 3; }
 205   virtual void transform(double *in, double *out);
 206   virtual GBool isOk() { return ok; }
 207
 208   int getNumFuncs() { return k; }
 209   Function *getFunc(int i) { return funcs[i]; }
 210   double *getBounds() { return bounds; }
 211   double *getEncode() { return encode; }
 212   double *getScale() { return scale; }
 213
 214 private:
 215
 216   StitchingFunction(const StitchingFunction *func);
 217
 218   int k;
 219   Function **funcs;
 220   double *bounds;
 221   double *encode;
 222   double *scale;
 223   GBool ok;
 224 };
 225
 226 //------------------------------------------------------------------------
 227 // PostScriptFunction
 228 //------------------------------------------------------------------------
 229
 230 class PostScriptFunction: public Function {
 231 public:
 232
 233   PostScriptFunction(Object *funcObj, Dict *dict);
 234   virtual ~PostScriptFunction();
 235   virtual Function *copy() { return new PostScriptFunction(this); }
 236   virtual int getType() { return 4; }
 237   virtual void transform(double *in, double *out);
 238   virtual GBool isOk() { return ok; }
 239
 240   GooString *getCodeString() { return codeString; }
 241
 242 private:
 243
 244   PostScriptFunction(const PostScriptFunction *func);
 245   GBool parseCode(Stream *str, int *codePtr);
 246   GooString *getToken(Stream *str);
 247   void resizeCode(int newSize);
 248   void exec(PSStack *stack, int codePtr);
 249
 250   GooString *codeString;
 251   PSObject *code;
 252   int codeSize;
 253   double cacheIn[funcMaxInputs];
 254   double cacheOut[funcMaxOutputs];
 255   GBool ok;
 256 };
 257
 258 #endif