2 * Copyright 2013 Google, Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
9 #ifndef SkRTConf_DEFINED
10 #define SkRTConf_DEFINED
18 /** \class SkRTConfBase
19 Non-templated base class for the runtime configs
24 SkRTConfBase(const char *name) : fName(name) {}
25 virtual ~SkRTConfBase() {}
26 virtual const char *getName() const { return fName.c_str(); }
27 virtual bool isDefault() const = 0;
28 virtual void print(SkWStream *o) const = 0;
29 virtual bool equals(const SkRTConfBase *conf) const = 0;
35 A class to provide runtime configurability.
37 template<typename T> class SkRTConf: public SkRTConfBase {
39 SkRTConf(const char *name, const T &defaultValue, const char *description);
40 operator const T&() const { return fValue; }
41 void print(SkWStream *o) const;
42 bool equals(const SkRTConfBase *conf) const;
43 bool isDefault() const { return fDefault == fValue; }
44 void set(const T& value) { fValue = value; }
46 void doPrint(char *s) const;
50 SkString fDescription;
54 #define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static SkRTConf<confType> varName(confName, defaultValue, description)
55 #define SK_CONF_SET(confname, value) \
56 skRTConfRegistry().set(confname, value, true)
57 /* SK_CONF_TRY_SET() is like SK_CONF_SET(), but doesn't complain if
58 confname can't be found. This is useful if the SK_CONF_DECLARE is
59 inside a source file whose linkage is dependent on the system. */
60 #define SK_CONF_TRY_SET(confname, value) \
61 skRTConfRegistry().set(confname, value, false)
63 #define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static confType varName = defaultValue
64 #define SK_CONF_SET(confname, value) (void) confname, (void) value
65 #define SK_CONF_TRY_SET(confname, value) (void) confname, (void) value
68 /** \class SkRTConfRegistry
69 A class that maintains a systemwide registry of all runtime configuration
70 parameters. Mainly used for printing them out and handling multiply-defined
74 class SkRTConfRegistry {
78 void printAll(const char *fname = NULL) const;
79 bool hasNonDefault() const;
80 void printNonDefault(const char *fname = NULL) const;
81 const char *configFileLocation() const;
82 void possiblyDumpFile() const;
83 void validate() const;
84 template <typename T> void set(const char *confname,
86 bool warnIfNotFound = true);
89 template<typename T> friend class SkRTConf;
91 void registerConf(SkRTConfBase *conf);
93 template <typename T> bool parse(const char *name, T* value);
95 SkTDArray<SkString *> fConfigFileKeys, fConfigFileValues;
96 typedef SkTDict< SkTDArray<SkRTConfBase *> * > ConfMap;
100 friend bool test_rt_conf_parse(SkRTConfRegistry*, const char* name, T* value);
103 // our singleton registry
105 SkRTConfRegistry &skRTConfRegistry();
108 SkRTConf<T>::SkRTConf(const char *name, const T &defaultValue, const char *description)
110 , fValue(defaultValue)
111 , fDefault(defaultValue)
112 , fDescription(description) {
115 if (skRTConfRegistry().parse(fName.c_str(), &value)) {
118 skRTConfRegistry().registerConf(this);
122 void SkRTConf<T>::print(SkWStream *o) const {
123 char outline[200]; // should be ok because we specify a max. width for everything here.
125 if (strlen(getName()) >= 30) {
126 o->writeText(getName());
128 outptr = &(outline[0]);
130 sprintf(outline, "%-30.30s", getName());
131 outptr = &(outline[30]);
135 sprintf(outptr+30, " %.128s", fDescription.c_str());
136 for (size_t i = strlen(outline); i --> 0 && ' ' == outline[i];) {
139 o->writeText(outline);
143 void SkRTConf<T>::doPrint(char *s) const {
144 sprintf(s, "%-30.30s", "How do I print myself??");
147 template<> inline void SkRTConf<bool>::doPrint(char *s) const {
149 sprintf(tmp, "%s # [%s]", fValue ? "true" : "false", fDefault ? "true" : "false");
150 sprintf(s, "%-30.30s", tmp);
153 template<> inline void SkRTConf<int>::doPrint(char *s) const {
155 sprintf(tmp, "%d # [%d]", fValue, fDefault);
156 sprintf(s, "%-30.30s", tmp);
159 template<> inline void SkRTConf<unsigned int>::doPrint(char *s) const {
161 sprintf(tmp, "%u # [%u]", fValue, fDefault);
162 sprintf(s, "%-30.30s", tmp);
165 template<> inline void SkRTConf<float>::doPrint(char *s) const {
167 sprintf(tmp, "%6.6f # [%6.6f]", fValue, fDefault);
168 sprintf(s, "%-30.30s", tmp);
171 template<> inline void SkRTConf<double>::doPrint(char *s) const {
173 sprintf(tmp, "%6.6f # [%6.6f]", fValue, fDefault);
174 sprintf(s, "%-30.30s", tmp);
177 template<> inline void SkRTConf<const char *>::doPrint(char *s) const {
179 sprintf(tmp, "%s # [%s]", fValue, fDefault);
180 sprintf(s, "%-30.30s", tmp);
184 bool SkRTConf<T>::equals(const SkRTConfBase *conf) const {
185 // static_cast here is okay because there's only one kind of child class.
186 const SkRTConf<T> *child_pointer = static_cast<const SkRTConf<T> *>(conf);
187 return child_pointer &&
188 fName == child_pointer->fName &&
189 fDescription == child_pointer->fDescription &&
190 fValue == child_pointer->fValue &&
191 fDefault == child_pointer->fDefault;