Diffstat (limited to 'noncore/unsupported/qpdf/xpdf/Function.h') (more/less context) (ignore whitespace changes)
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1 | //======================================================================== | ||
2 | // | ||
3 | // Function.h | ||
4 | // | ||
5 | // Copyright 2001 Derek B. Noonburg | ||
6 | // | ||
7 | //======================================================================== | ||
8 | |||
9 | #ifndef FUNCTION_H | ||
10 | #define FUNCTION_H | ||
11 | |||
12 | #ifdef __GNUC__ | ||
13 | #pragma interface | ||
14 | #endif | ||
15 | |||
16 | #include "gtypes.h" | ||
17 | #include "Object.h" | ||
18 | |||
19 | class Dict; | ||
20 | class Stream; | ||
21 | struct PSObject; | ||
22 | class PSStack; | ||
23 | |||
24 | //------------------------------------------------------------------------ | ||
25 | // Function | ||
26 | //------------------------------------------------------------------------ | ||
27 | |||
28 | #define funcMaxInputs 8 | ||
29 | #define funcMaxOutputs 8 | ||
30 | |||
31 | class Function { | ||
32 | public: | ||
33 | |||
34 | Function(); | ||
35 | |||
36 | virtual ~Function(); | ||
37 | |||
38 | // Construct a function. Returns NULL if unsuccessful. | ||
39 | static Function *parse(Object *funcObj); | ||
40 | |||
41 | // Initialize the entries common to all function types. | ||
42 | GBool init(Dict *dict); | ||
43 | |||
44 | virtual Function *copy() = 0; | ||
45 | |||
46 | // Return size of input and output tuples. | ||
47 | int getInputSize() { return m; } | ||
48 | int getOutputSize() { return n; } | ||
49 | |||
50 | // Transform an input tuple into an output tuple. | ||
51 | virtual void transform(fouble *in, fouble *out) = 0; | ||
52 | |||
53 | virtual GBool isOk() = 0; | ||
54 | |||
55 | protected: | ||
56 | |||
57 | int m, n; // size of input and output tuples | ||
58 | fouble // min and max values for function domain | ||
59 | domain[funcMaxInputs][2]; | ||
60 | fouble // min and max values for function range | ||
61 | range[funcMaxOutputs][2]; | ||
62 | GBool hasRange; // set if range is defined | ||
63 | }; | ||
64 | |||
65 | //------------------------------------------------------------------------ | ||
66 | // IdentityFunction | ||
67 | //------------------------------------------------------------------------ | ||
68 | |||
69 | class IdentityFunction: public Function { | ||
70 | public: | ||
71 | |||
72 | IdentityFunction(); | ||
73 | virtual ~IdentityFunction(); | ||
74 | virtual Function *copy() { return new IdentityFunction(); } | ||
75 | virtual void transform(fouble *in, fouble *out); | ||
76 | virtual GBool isOk() { return gTrue; } | ||
77 | |||
78 | private: | ||
79 | }; | ||
80 | |||
81 | //------------------------------------------------------------------------ | ||
82 | // SampledFunction | ||
83 | //------------------------------------------------------------------------ | ||
84 | |||
85 | class SampledFunction: public Function { | ||
86 | public: | ||
87 | |||
88 | SampledFunction(Object *funcObj, Dict *dict); | ||
89 | virtual ~SampledFunction(); | ||
90 | virtual Function *copy() { return new SampledFunction(this); } | ||
91 | virtual void transform(fouble *in, fouble *out); | ||
92 | virtual GBool isOk() { return ok; } | ||
93 | |||
94 | private: | ||
95 | |||
96 | SampledFunction(SampledFunction *func); | ||
97 | |||
98 | int // number of samples for each domain element | ||
99 | sampleSize[funcMaxInputs]; | ||
100 | fouble // min and max values for domain encoder | ||
101 | encode[funcMaxInputs][2]; | ||
102 | fouble // min and max values for range decoder | ||
103 | decode[funcMaxOutputs][2]; | ||
104 | fouble *samples; // the samples | ||
105 | GBool ok; | ||
106 | }; | ||
107 | |||
108 | //------------------------------------------------------------------------ | ||
109 | // ExponentialFunction | ||
110 | //------------------------------------------------------------------------ | ||
111 | |||
112 | class ExponentialFunction: public Function { | ||
113 | public: | ||
114 | |||
115 | ExponentialFunction(Object *funcObj, Dict *dict); | ||
116 | virtual ~ExponentialFunction(); | ||
117 | virtual Function *copy() { return new ExponentialFunction(this); } | ||
118 | virtual void transform(fouble *in, fouble *out); | ||
119 | virtual GBool isOk() { return ok; } | ||
120 | |||
121 | private: | ||
122 | |||
123 | ExponentialFunction(ExponentialFunction *func); | ||
124 | |||
125 | fouble c0[funcMaxOutputs]; | ||
126 | fouble c1[funcMaxOutputs]; | ||
127 | fouble e; | ||
128 | GBool ok; | ||
129 | }; | ||
130 | |||
131 | //------------------------------------------------------------------------ | ||
132 | // StitchingFunction | ||
133 | //------------------------------------------------------------------------ | ||
134 | |||
135 | class StitchingFunction: public Function { | ||
136 | public: | ||
137 | |||
138 | StitchingFunction(Object *funcObj, Dict *dict); | ||
139 | virtual ~StitchingFunction(); | ||
140 | virtual Function *copy() { return new StitchingFunction(this); } | ||
141 | virtual void transform(fouble *in, fouble *out); | ||
142 | virtual GBool isOk() { return ok; } | ||
143 | |||
144 | private: | ||
145 | |||
146 | StitchingFunction(StitchingFunction *func); | ||
147 | |||
148 | int k; | ||
149 | Function **funcs; | ||
150 | fouble *bounds; | ||
151 | fouble *encode; | ||
152 | GBool ok; | ||
153 | }; | ||
154 | |||
155 | //------------------------------------------------------------------------ | ||
156 | // PostScriptFunction | ||
157 | //------------------------------------------------------------------------ | ||
158 | |||
159 | class PostScriptFunction: public Function { | ||
160 | public: | ||
161 | |||
162 | PostScriptFunction(Object *funcObj, Dict *dict); | ||
163 | virtual ~PostScriptFunction(); | ||
164 | virtual Function *copy() { return new PostScriptFunction(this); } | ||
165 | virtual void transform(fouble *in, fouble *out); | ||
166 | virtual GBool isOk() { return ok; } | ||
167 | |||
168 | private: | ||
169 | |||
170 | PostScriptFunction(PostScriptFunction *func); | ||
171 | GBool parseCode(Stream *str, int *codePtr); | ||
172 | GString *getToken(Stream *str); | ||
173 | void resizeCode(int newSize); | ||
174 | void exec(PSStack *stack, int codePtr); | ||
175 | |||
176 | PSObject *code; | ||
177 | int codeSize; | ||
178 | GBool ok; | ||
179 | }; | ||
180 | |||
181 | #endif | ||