FuzzQuadRoots.cpp File Reference

#include "fuzz/Fuzz.h"
#include "include/private/base/SkAssert.h"
#include "include/private/base/SkFloatingPoint.h"
#include "src/base/SkCubics.h"
#include "src/base/SkQuads.h"
#include "src/base/SkUtils.h"
#include <cmath>

Go to the source code of this file.

Functions
static void	fuzz_quad_real_roots (double A, double B, double C)
	DEF_FUZZ (QuadRoots, fuzz)

Function Documentation

DEF_FUZZ()

DEF_FUZZ	(	QuadRoots	,
		fuzz
	)

Definition at line 36 of file FuzzQuadRoots.cpp.

                          {
    double A, B, C;
    fuzz->next(&A);
    fuzz->next(&B);
    fuzz->next(&C);
 
    // Uncomment for easy test case creation
//    SkDebugf("A %16e (0x%lx) B %16e (0x%lx) C %16e (0x%lx)\n",
//             A, sk_bit_cast<uint64_t>(A), B, sk_bit_cast<uint64_t>(B),
//             C, sk_bit_cast<uint64_t>(C));
 
    fuzz_quad_real_roots(A, B, C);
}

fuzz_quad_real_roots()

static void fuzz_quad_real_roots ( double  A, double  B, double  C  )

static

Definition at line 17 of file FuzzQuadRoots.cpp.

                                                               {
    double roots[2];
    const int numSolutions = SkQuads::RootsReal(A, B, C, roots);
    SkASSERT_RELEASE(numSolutions >= 0 && numSolutions <= 2);
    for (int i = 0; i < numSolutions; i++) {
        SkASSERT_RELEASE(std::isfinite(roots[i]));
        // You may be tempted to add assertions that plug the provided solutions into
        // the quadratic equation and verify that the result is zero. Be advised
        // that the fuzzer is very good at finding float values that result in
        // seemingly arbitrarily large errors, due to the imprecision of floating
        // point math. Unless the input range is sufficiently small, such an
        // effort seems fruitless.
    }
    if (numSolutions == 2) {
        // Roots should not be duplicated
        SkASSERT_RELEASE(!sk_doubles_nearly_equal_ulps(roots[0], roots[1]));
    }
}