skia2/fuzz/FuzzPathop.cpp
Mike Reed 7d34dc7747 Revert "Revert "switch to new filltype for SkPath""
This reverts commit 3e7af41224.

Change-Id: Id4f66b3956f4bdbe690db20fc478b7365ee89717
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/256676
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
2019-11-26 17:43:14 +00:00

203 lines
5.5 KiB
C++

/*
* Copyright 2016 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"
#include "include/core/SkPath.h"
#include "include/core/SkRect.h"
#include "include/pathops/SkPathOps.h"
const uint8_t MAX_OPS = 20;
DEF_FUZZ(Pathop, fuzz) {
uint8_t choice;
fuzz->nextRange(&choice, 0, 4);
switch (choice) {
case 0: {
uint8_t ops;
fuzz->nextRange(&ops, 0, MAX_OPS);
SkOpBuilder builder;
for (uint8_t i = 0; i < ops && !fuzz->exhausted(); i++) {
SkPath path;
FuzzEvilPath(fuzz, &path, SkPath::Verb::kDone_Verb);
SkPathFillType ft;
fuzz->nextRange(&ft, 0, (int)SkPathFillType::kInverseEvenOdd);
path.setFillType(ft);
SkPathOp op;
fuzz->nextRange(&op, 0, SkPathOp::kReverseDifference_SkPathOp);
builder.add(path, op);
}
SkPath result;
builder.resolve(&result);
break;
}
case 1: {
SkPath path;
FuzzEvilPath(fuzz, &path, SkPath::Verb::kDone_Verb);
SkPathFillType ft;
fuzz->nextRange(&ft, 0, (int)SkPathFillType::kInverseEvenOdd);
path.setFillType(ft);
SkPath result;
bool isSame;
fuzz->next(&isSame);
if (isSame) {
result = path;
}
Simplify(path, &result);
break;
}
case 2: {
SkPath path;
FuzzEvilPath(fuzz, &path, SkPath::Verb::kDone_Verb);
SkPathFillType ft;
fuzz->nextRange(&ft, 0, SkPathFillType::kInverseEvenOdd);
path.setFillType(ft);
SkPath path2;
FuzzEvilPath(fuzz, &path2, SkPath::Verb::kDone_Verb);
fuzz->nextRange(&ft, 0, SkPathFillType::kInverseEvenOdd);
path.setFillType(ft);
SkPathOp op;
fuzz->nextRange(&op, 0, SkPathOp::kReverseDifference_SkPathOp);
SkPath result;
uint8_t pickOutput;
fuzz->nextRange(&pickOutput, 0, 2);
if (pickOutput == 1) {
result = path;
} else if (pickOutput == 2) {
result = path2;
}
Op(path, path2, op, &result);
break;
}
case 3: {
SkPath path;
FuzzEvilPath(fuzz, &path, SkPath::Verb::kDone_Verb);
SkPathFillType ft;
fuzz->nextRange(&ft, 0, SkPathFillType::kInverseEvenOdd);
path.setFillType(ft);
SkPath result;
bool isSame;
fuzz->next(&isSame);
if (isSame) {
result = path;
}
AsWinding(path, &result);
break;
}
case 4: {
SkPath path;
FuzzEvilPath(fuzz, &path, SkPath::Verb::kDone_Verb);
SkPathFillType ft;
fuzz->nextRange(&ft, 0, SkPathFillType::kInverseEvenOdd);
path.setFillType(ft);
SkRect result;
TightBounds(path, &result);
break;
}
default: {
SkASSERT(false);
break;
}
}
}
const int kLastOp = SkPathOp::kReverseDifference_SkPathOp;
void BuildPath(Fuzz* fuzz, SkPath* path) {
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 % (SkPath::Verb::kDone_Verb + 1)) {
case SkPath::Verb::kMove_Verb:
if (fuzz->remaining() < (2*sizeof(SkScalar))) {
fuzz->deplete();
return;
}
fuzz->next(&a, &b);
path->moveTo(a, b);
break;
case SkPath::Verb::kLine_Verb:
if (fuzz->remaining() < (2*sizeof(SkScalar))) {
fuzz->deplete();
return;
}
fuzz->next(&a, &b);
path->lineTo(a, b);
break;
case SkPath::Verb::kQuad_Verb:
if (fuzz->remaining() < (4*sizeof(SkScalar))) {
fuzz->deplete();
return;
}
fuzz->next(&a, &b, &c, &d);
path->quadTo(a, b, c, d);
break;
case SkPath::Verb::kConic_Verb:
if (fuzz->remaining() < (5*sizeof(SkScalar))) {
fuzz->deplete();
return;
}
fuzz->next(&a, &b, &c, &d, &e);
path->conicTo(a, b, c, d, e);
break;
case SkPath::Verb::kCubic_Verb:
if (fuzz->remaining() < (6*sizeof(SkScalar))) {
fuzz->deplete();
return;
}
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;
}
}
}
DEF_FUZZ(LegacyChromiumPathop, fuzz) {
// See https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/skia_pathop_fuzzer.cc
SkOpBuilder builder;
while (!fuzz->exhausted()) {
SkPath path;
uint8_t op;
fuzz->next(&op);
if (fuzz->exhausted()) {
break;
}
BuildPath(fuzz, &path);
builder.add(path, static_cast<SkPathOp>(op % (kLastOp + 1)));
}
SkPath result;
builder.resolve(&result);
}