There can be only one (SkRandom)!

include/utils/SkRandom.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkRandom_DEFINED
 #define SkRandom_DEFINED
 
 #include "SkScalar.h"
 
-/** \class SkLCGRandom
-
-    Utility class that implements pseudo random 32bit numbers using a fast
-    linear equation. Unlike rand(), this class holds its own seed (initially
-    set to 0), so that multiple instances can be used with no side-effects.
-*/
-class SkLCGRandom {
-public:
-    SkLCGRandom() : fSeed(0) {}
-    SkLCGRandom(uint32_t seed) : fSeed(seed) {}
-
-    /** Return the next pseudo random number as an unsigned 32bit value.
-    */
-    uint32_t nextU() { uint32_t r = fSeed * kMul + kAdd; fSeed = r; return r; }
-
-    /** Return the next pseudo random number as a signed 32bit value.
-    */
-    int32_t nextS() { return (int32_t)this->nextU(); }
-
-    /** Return the next pseudo random number as an unsigned 16bit value.
-    */
-    U16CPU nextU16() { return this->nextU() >> 16; }
-
-    /** Return the next pseudo random number as a signed 16bit value.
-    */
-    S16CPU nextS16() { return this->nextS() >> 16; }
-
-    /**
-     *  Returns value [0...1) as a float
-     */
-    float nextF() {
-        // const is 1 / (2^32 - 1)
-        return (float)(this->nextU() * 2.32830644e-10);
-    }
-
-    /**
-     *  Returns value [min...max) as a float
-     */
-    float nextRangeF(float min, float max) {
-        return min + this->nextF() * (max - min);
-    }
-
-    /** Return the next pseudo random number, as an unsigned value of
-        at most bitCount bits.
-        @param bitCount The maximum number of bits to be returned
-    */
-    uint32_t nextBits(unsigned bitCount) {
-        SkASSERT(bitCount > 0 && bitCount <= 32);
-        return this->nextU() >> (32 - bitCount);
-    }
-
-    /** Return the next pseudo random unsigned number, mapped to lie within
-        [min, max] inclusive.
-    */
-    uint32_t nextRangeU(uint32_t min, uint32_t max) {
-        SkASSERT(min <= max);
-        uint32_t range = max - min + 1;
-        if (0 == range) {
-            return this->nextU();
-        } else {
-            return min + this->nextU() % range;
-        }
-    }
-
-    /** Return the next pseudo random unsigned number, mapped to lie within
-        [0, count).
-     */
-    uint32_t nextULessThan(uint32_t count) {
-        SkASSERT(count > 0);
-        return this->nextRangeU(0, count - 1);
-    }
-
-    /** Return the next pseudo random number expressed as an unsigned SkFixed
-        in the range [0..SK_Fixed1).
-    */
-    SkFixed nextUFixed1() { return this->nextU() >> 16; }
-
-    /** Return the next pseudo random number expressed as a signed SkFixed
-        in the range (-SK_Fixed1..SK_Fixed1).
-    */
-    SkFixed nextSFixed1() { return this->nextS() >> 15; }
-
-    /** Return the next pseudo random number expressed as a SkScalar
-        in the range [0..SK_Scalar1).
-    */
-    SkScalar nextUScalar1() { return SkFixedToScalar(this->nextUFixed1()); }
-
-    /** Return the next pseudo random number expressed as a SkScalar
-        in the range [min..max).
-    */
-    SkScalar nextRangeScalar(SkScalar min, SkScalar max) {
-        return this->nextUScalar1() * (max - min) + min;
-    }
-
-    /** Return the next pseudo random number expressed as a SkScalar
-        in the range (-SK_Scalar1..SK_Scalar1).
-    */
-    SkScalar nextSScalar1() { return SkFixedToScalar(this->nextSFixed1()); }
-
-    /** Return the next pseudo random number as a bool.
-    */
-    bool nextBool() { return this->nextU() >= 0x80000000; }
-
-    /** A biased version of nextBool().
-     */
-    bool nextBiasedBool(SkScalar fractionTrue) {
-        SkASSERT(fractionTrue >= 0 && fractionTrue <= SK_Scalar1);
-        return this->nextUScalar1() <= fractionTrue;
-    }
-
-    /**
-     *  Return the next pseudo random number as a signed 64bit value.
-     */
-    int64_t next64() {
-        int64_t hi = this->nextS();
-        return (hi << 32) | this->nextU();
-    }
-
-    /**
-     *  Return the current seed. This allows the caller to later reset to the
-     *  same seed (using setSeed) so it can generate the same sequence.
-     */
-    int32_t getSeed() const { return fSeed; }
-
-    /** Set the seed of the random object. The seed is initialized to 0 when the
-        object is first created, and is updated each time the next pseudo random
-        number is requested.
-    */
-    void setSeed(int32_t seed) { fSeed = (uint32_t)seed; }
-
-private:
-    //  See "Numerical Recipes in C", 1992 page 284 for these constants
-    enum {
-        kMul = 1664525,
-        kAdd = 1013904223
-    };
-    uint32_t fSeed;
-};
-
 /** \class SkRandom
 
  Utility class that implements pseudo random 32bit numbers using Marsaglia's
  multiply-with-carry "mother of all" algorithm. Unlike rand(), this class holds
  its own state, so that multiple instances can be used with no side-effects.
 
  Has a large period and all bits are well-randomized.
  */
 class SkRandom {
 public:
@@ skipping 151 matching lines @@
     enum {
         kKMul = 30345,
         kJMul = 18000,
     };
 
     uint32_t fK;
     uint32_t fJ;
 };
 
 #endif