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/*
* Copyright 2013 Google, Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkRTConf_DEFINED
#define SkRTConf_DEFINED
#include "../private/SkTDArray.h"
#include "../private/SkTDict.h"
#include "SkString.h"
#include "SkStream.h"
/** \class SkRTConfBase
Non-templated base class for the runtime configs
*/
class SkRTConfBase {
public:
SkRTConfBase(const char *name) : fName(name) {}
virtual ~SkRTConfBase() {}
virtual const char *getName() const { return fName.c_str(); }
virtual bool isDefault() const = 0;
virtual void print(SkWStream *o) const = 0;
virtual bool equals(const SkRTConfBase *conf) const = 0;
protected:
SkString fName;
};
/** \class SkRTConf
A class to provide runtime configurability.
*/
template<typename T> class SkRTConf: public SkRTConfBase {
public:
SkRTConf(const char *name, const T &defaultValue, const char *description);
operator const T&() const { return fValue; }
void print(SkWStream *o) const;
bool equals(const SkRTConfBase *conf) const;
bool isDefault() const { return fDefault == fValue; }
void set(const T& value) { fValue = value; }
protected:
void doPrint(char *s) const;
T fValue;
T fDefault;
SkString fDescription;
};
#ifdef SK_DEBUG
#define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static SkRTConf<confType> varName(confName, defaultValue, description)
#define SK_CONF_SET(confname, value) \
skRTConfRegistry().set(confname, value, true)
/* SK_CONF_TRY_SET() is like SK_CONF_SET(), but doesn't complain if
confname can't be found. This is useful if the SK_CONF_DECLARE is
inside a source file whose linkage is dependent on the system. */
#define SK_CONF_TRY_SET(confname, value) \
skRTConfRegistry().set(confname, value, false)
#else
#define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static confType varName = defaultValue
#define SK_CONF_SET(confname, value) (void) confname, (void) value
#define SK_CONF_TRY_SET(confname, value) (void) confname, (void) value
#endif
/** \class SkRTConfRegistry
A class that maintains a systemwide registry of all runtime configuration
parameters. Mainly used for printing them out and handling multiply-defined
knobs.
*/
class SkRTConfRegistry {
public:
SkRTConfRegistry();
~SkRTConfRegistry();
void printAll(const char *fname = NULL) const;
bool hasNonDefault() const;
void printNonDefault(const char *fname = NULL) const;
const char *configFileLocation() const;
void possiblyDumpFile() const;
void validate() const;
template <typename T> void set(const char *confname,
T value,
bool warnIfNotFound = true);
private:
template<typename T> friend class SkRTConf;
void registerConf(SkRTConfBase *conf);
template <typename T> bool parse(const char *name, T* value);
SkTDArray<SkString *> fConfigFileKeys, fConfigFileValues;
typedef SkTDict< SkTDArray<SkRTConfBase *> * > ConfMap;
ConfMap fConfs;
template <typename T>
friend bool test_rt_conf_parse(SkRTConfRegistry*, const char* name, T* value);
};
// our singleton registry
SkRTConfRegistry &skRTConfRegistry();
template<typename T>
SkRTConf<T>::SkRTConf(const char *name, const T &defaultValue, const char *description)
: SkRTConfBase(name)
, fValue(defaultValue)
, fDefault(defaultValue)
, fDescription(description) {
T value;
if (skRTConfRegistry().parse(fName.c_str(), &value)) {
fValue = value;
}
skRTConfRegistry().registerConf(this);
}
template<typename T>
void SkRTConf<T>::print(SkWStream *o) const {
char outline[200]; // should be ok because we specify a max. width for everything here.
char *outptr;
if (strlen(getName()) >= 30) {
o->writeText(getName());
o->writeText(" ");
outptr = &(outline[0]);
} else {
sprintf(outline, "%-30.30s", getName());
outptr = &(outline[30]);
}
doPrint(outptr);
sprintf(outptr+30, " %.128s", fDescription.c_str());
for (size_t i = strlen(outline); i --> 0 && ' ' == outline[i];) {
outline[i] = '\0';
}
o->writeText(outline);
}
template<typename T>
void SkRTConf<T>::doPrint(char *s) const {
sprintf(s, "%-30.30s", "How do I print myself??");
}
template<> inline void SkRTConf<bool>::doPrint(char *s) const {
char tmp[30];
sprintf(tmp, "%s # [%s]", fValue ? "true" : "false", fDefault ? "true" : "false");
sprintf(s, "%-30.30s", tmp);
}
template<> inline void SkRTConf<int>::doPrint(char *s) const {
char tmp[30];
sprintf(tmp, "%d # [%d]", fValue, fDefault);
sprintf(s, "%-30.30s", tmp);
}
template<> inline void SkRTConf<unsigned int>::doPrint(char *s) const {
char tmp[30];
sprintf(tmp, "%u # [%u]", fValue, fDefault);
sprintf(s, "%-30.30s", tmp);
}
template<> inline void SkRTConf<float>::doPrint(char *s) const {
char tmp[30];
sprintf(tmp, "%6.6f # [%6.6f]", fValue, fDefault);
sprintf(s, "%-30.30s", tmp);
}
template<> inline void SkRTConf<double>::doPrint(char *s) const {
char tmp[30];
sprintf(tmp, "%6.6f # [%6.6f]", fValue, fDefault);
sprintf(s, "%-30.30s", tmp);
}
template<> inline void SkRTConf<const char *>::doPrint(char *s) const {
char tmp[30];
sprintf(tmp, "%s # [%s]", fValue, fDefault);
sprintf(s, "%-30.30s", tmp);
}
template<typename T>
bool SkRTConf<T>::equals(const SkRTConfBase *conf) const {
// static_cast here is okay because there's only one kind of child class.
const SkRTConf<T> *child_pointer = static_cast<const SkRTConf<T> *>(conf);
return child_pointer &&
fName == child_pointer->fName &&
fDescription == child_pointer->fDescription &&
fValue == child_pointer->fValue &&
fDefault == child_pointer->fDefault;
}
#endif
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