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skia2/fuzz/FuzzCommon.cpp
Mike Reed f1f1e7dd36 Hide shrinkToFit -- not needed now that we have pathbuilder 
Step one is to make it private -- only skottie needs it at the moment
Stpe two is to modify pathops to use builders, and then we can likely
remove it shrinkToFit entirely (since builder.snapshot() is already snug).

bug: skia:9000

Change-Id: I9126bcb6fc2094fbeede2acb1f211b0ab771feba
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327341
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
2020-10-15 19:47:06 +00:00

339 lines
11 KiB
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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "fuzz/Fuzz.h"
#include "fuzz/FuzzCommon.h"
// We don't always want to test NaNs and infinities.
static void fuzz_nice_float(Fuzz* fuzz, float* f) {
float v;
fuzz->next(&v);
constexpr float kLimit = 1.0e35f; // FLT_MAX?
*f = (v == v && v <= kLimit && v >= -kLimit) ? v : 0.0f;
}
template <typename... Args>
static void fuzz_nice_float(Fuzz* fuzz, float* f, Args... rest) {
fuzz_nice_float(fuzz, f);
fuzz_nice_float(fuzz, rest...);
}
static void fuzz_nice_rect(Fuzz* fuzz, SkRect* r) {
fuzz_nice_float(fuzz, &r->fLeft, &r->fTop, &r->fRight, &r->fBottom);
r->sort();
}
// allows some float values for path points
void FuzzNicePath(Fuzz* fuzz, SkPath* path, int maxOps) {
if (maxOps <= 0 || fuzz->exhausted() || path->countPoints() > 100000) {
return;
}
uint8_t fillType;
fuzz->nextRange(&fillType, 0, (uint8_t)SkPathFillType::kInverseEvenOdd);
path->setFillType((SkPathFillType)fillType);
uint8_t numOps;
fuzz->nextRange(&numOps, 0, maxOps);
for (uint8_t i = 0; i < numOps; ++i) {
// When we start adding the path to itself, the fuzzer can make an
// exponentially long path, which causes timeouts.
if (path->countPoints() > 100000) {
return;
}
// How many items in the switch statement below.
constexpr uint8_t PATH_OPERATIONS = 32;
uint8_t op;
fuzz->nextRange(&op, 0, PATH_OPERATIONS);
bool test;
SkPath p;
SkMatrix m;
SkRRect rr;
SkRect r;
SkPathDirection dir;
unsigned int ui;
SkScalar a, b, c, d, e, f;
switch (op) {
case 0:
fuzz_nice_float(fuzz, &a, &b);
path->moveTo(a, b);
break;
case 1:
fuzz_nice_float(fuzz, &a, &b);
path->rMoveTo(a, b);
break;
case 2:
fuzz_nice_float(fuzz, &a, &b);
path->lineTo(a, b);
break;
case 3:
fuzz_nice_float(fuzz, &a, &b);
path->rLineTo(a, b);
break;
case 4:
fuzz_nice_float(fuzz, &a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case 5:
fuzz_nice_float(fuzz, &a, &b, &c, &d);
path->rQuadTo(a, b, c, d);
break;
case 6:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case 7:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->rConicTo(a, b, c, d, e);
break;
case 8:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e, &f);
path->cubicTo(a, b, c, d, e, f);
break;
case 9:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e, &f);
path->rCubicTo(a, b, c, d, e, f);
break;
case 10:
fuzz_nice_float(fuzz, &a, &b, &c, &d, &e);
path->arcTo(a, b, c, d, e);
break;
case 11:
fuzz_nice_float(fuzz, &a, &b);
fuzz_nice_rect(fuzz, &r);
fuzz->next(&test);
path->arcTo(r, a, b, test);
break;
case 12:
path->close();
break;
case 13:
fuzz_nice_rect(fuzz, &r);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
path->addRect(r, dir);
break;
case 14:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_rect(fuzz, &r);
fuzz->next(&ui);
path->addRect(r, dir, ui);
break;
case 15:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_rect(fuzz, &r);
path->addOval(r, dir);
break;
case 16:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_rect(fuzz, &r);
fuzz->next(&ui);
path->addOval(r, dir, ui);
break;
case 17:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
fuzz_nice_float(fuzz, &a, &b, &c);
path->addCircle(a, b, c, dir);
break;
case 18:
fuzz_nice_rect(fuzz, &r);
fuzz_nice_float(fuzz, &a, &b);
path->addArc(r, a, b);
break;
case 19:
fuzz_nice_float(fuzz, &a, &b);
fuzz_nice_rect(fuzz, &r);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
path->addRoundRect(r, a, b, dir);
break;
case 20:
FuzzNiceRRect(fuzz, &rr);
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
path->addRRect(rr, dir);
break;
case 21:
fuzz->nextRange(&ui, 0, 1);
dir = static_cast<SkPathDirection>(ui);
FuzzNiceRRect(fuzz, &rr);
path->addRRect(rr, dir, ui);
break;
case 22: {
fuzz->nextRange(&ui, 0, 1);
SkPath::AddPathMode mode = static_cast<SkPath::AddPathMode>(ui);
FuzzNiceMatrix(fuzz, &m);
FuzzNicePath(fuzz, &p, maxOps-1);
path->addPath(p, m, mode);
break;
}
case 23: {
fuzz->nextRange(&ui, 0, 1);
SkPath::AddPathMode mode = static_cast<SkPath::AddPathMode>(ui);
FuzzNiceMatrix(fuzz, &m);
path->addPath(*path, m, mode);
break;
}
case 24:
FuzzNicePath(fuzz, &p, maxOps-1);
path->reverseAddPath(p);
break;
case 25:
path->addPath(*path);
break;
case 26:
path->reverseAddPath(*path);
break;
case 27:
fuzz_nice_float(fuzz, &a, &b);
path->offset(a, b, path);
break;
case 28:
FuzzNicePath(fuzz, &p, maxOps-1);
fuzz_nice_float(fuzz, &a, &b);
p.offset(a, b, path);
break;
case 29:
FuzzNiceMatrix(fuzz, &m);
path->transform(m, path);
break;
case 30:
FuzzNicePath(fuzz, &p, maxOps-1);
FuzzNiceMatrix(fuzz, &m);
p.transform(m, path);
break;
case 31:
fuzz_nice_float(fuzz, &a, &b);
path->setLastPt(a, b);
break;
default:
SkASSERT(false);
break;
}
SkASSERTF( path->isValid(), "path->isValid() failed at op %d, case %d", i, op);
}
}
// allows all float values for path points
void FuzzEvilPath(Fuzz* fuzz, SkPath* path, int last_verb) {
while (!fuzz->exhausted()) {
// Use a uint8_t to conserve bytes. This makes our "fuzzed bytes footprint"
// smaller, which leads to more efficient fuzzing.
uint8_t operation;
fuzz->next(&operation);
SkScalar a,b,c,d,e,f;
switch (operation % (last_verb + 1)) {
case SkPath::Verb::kMove_Verb:
fuzz->next(&a, &b);
path->moveTo(a, b);
break;
case SkPath::Verb::kLine_Verb:
fuzz->next(&a, &b);
path->lineTo(a, b);
break;
case SkPath::Verb::kQuad_Verb:
fuzz->next(&a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case SkPath::Verb::kConic_Verb:
fuzz->next(&a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case SkPath::Verb::kCubic_Verb:
fuzz->next(&a, &b, &c, &d, &e, &f);
path->cubicTo(a, b, c, d, e, f);
break;
case SkPath::Verb::kClose_Verb:
path->close();
break;
case SkPath::Verb::kDone_Verb:
// In this case, simply exit.
return;
}
}
}
void FuzzNiceRRect(Fuzz* fuzz, SkRRect* rr) {
SkRect r;
fuzz_nice_rect(fuzz, &r);
SkVector radii[4];
for (SkVector& vec : radii) {
fuzz->nextRange(&vec.fX, 0.0f, 1.0f);
vec.fX *= 0.5f * r.width();
fuzz->nextRange(&vec.fY, 0.0f, 1.0f);
vec.fY *= 0.5f * r.height();
}
rr->setRectRadii(r, radii);
SkASSERT(rr->isValid());
}
void FuzzNiceMatrix(Fuzz* fuzz, SkMatrix* m) {
constexpr int kArrayLength = 9;
SkScalar buffer[kArrayLength];
int matrixType;
fuzz->nextRange(&matrixType, 0, 4);
switch (matrixType) {
case 0: // identity
*m = SkMatrix::I();
return;
case 1: // translate
fuzz->nextRange(&buffer[0], -4000.0f, 4000.0f);
fuzz->nextRange(&buffer[1], -4000.0f, 4000.0f);
*m = SkMatrix::Translate(buffer[0], buffer[1]);
return;
case 2: // translate + scale
fuzz->nextRange(&buffer[0], -400.0f, 400.0f);
fuzz->nextRange(&buffer[1], -400.0f, 400.0f);
fuzz->nextRange(&buffer[2], -4000.0f, 4000.0f);
fuzz->nextRange(&buffer[3], -4000.0f, 4000.0f);
*m = SkMatrix::Scale(buffer[0], buffer[1]);
m->postTranslate(buffer[2], buffer[3]);
return;
case 3: // affine
fuzz->nextN(buffer, 6);
m->setAffine(buffer);
return;
case 4: // perspective
fuzz->nextN(buffer, kArrayLength);
m->set9(buffer);
return;
default:
SkASSERT(false);
return;
}
}
void FuzzNiceRegion(Fuzz* fuzz, SkRegion* region, int maxN) {
uint8_t N;
fuzz->nextRange(&N, 0, maxN);
for (uint8_t i = 0; i < N; ++i) {
SkIRect r;
SkRegion::Op op;
// Avoid the sentinal value used by Region.
fuzz->nextRange(&r.fLeft, -2147483646, 2147483646);
fuzz->nextRange(&r.fTop, -2147483646, 2147483646);
fuzz->nextRange(&r.fRight, -2147483646, 2147483646);
fuzz->nextRange(&r.fBottom, -2147483646, 2147483646);
r.sort();
fuzz->nextRange(&op, 0, SkRegion::kLastOp);
if (!region->op(r, op)) {
return;
}
}
}
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