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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "skia/ext/refptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace skia {
namespace {
TEST(RefPtrTest, ReferenceCounting) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_TRUE(ref->unique());
{
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1 = AdoptRef(ref);
EXPECT_TRUE(ref->unique());
EXPECT_TRUE(refptr1->unique());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
{
// Take a second reference for the second instance.
RefPtr<SkRefCnt> refptr2(refptr1);
EXPECT_FALSE(ref->unique());
RefPtr<SkRefCnt> refptr3;
EXPECT_FALSE(refptr3);
// Take a third reference for the third instance.
refptr3 = refptr1;
EXPECT_FALSE(ref->unique());
// Same object, so should have the same refcount.
refptr2 = refptr3;
EXPECT_FALSE(ref->unique());
// Drop the object from refptr2, so it should lose its reference.
EXPECT_TRUE(refptr2);
refptr2.clear();
EXPECT_FALSE(ref->unique());
EXPECT_FALSE(refptr2);
EXPECT_EQ(NULL, refptr2.get());
EXPECT_TRUE(refptr3);
EXPECT_FALSE(refptr3->unique());
EXPECT_EQ(ref, &*refptr3);
EXPECT_EQ(ref, refptr3.get());
}
// Drop a reference when the third object is destroyed.
EXPECT_TRUE(ref->unique());
}
}
TEST(RefPtrTest, Construct) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_TRUE(ref->unique());
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1(AdoptRef(ref));
EXPECT_TRUE(ref->unique());
EXPECT_TRUE(refptr1->unique());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
RefPtr<SkRefCnt> refptr2(refptr1);
EXPECT_FALSE(ref->unique());
}
TEST(RefPtrTest, DeclareAndAssign) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_TRUE(ref->unique());
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1 = AdoptRef(ref);
EXPECT_TRUE(ref->unique());
EXPECT_TRUE(refptr1->unique());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
RefPtr<SkRefCnt> refptr2 = refptr1;
EXPECT_FALSE(ref->unique());
}
TEST(RefPtrTest, Assign) {
SkRefCnt* ref = new SkRefCnt();
EXPECT_TRUE(ref->unique());
// Adopt the reference from the caller on creation.
RefPtr<SkRefCnt> refptr1;
refptr1 = AdoptRef(ref);
EXPECT_TRUE(ref->unique());
EXPECT_TRUE(refptr1->unique());
EXPECT_EQ(ref, &*refptr1);
EXPECT_EQ(ref, refptr1.get());
RefPtr<SkRefCnt> refptr2;
refptr2 = refptr1;
EXPECT_FALSE(ref->unique());
}
class Subclass : public SkRefCnt {};
TEST(RefPtrTest, Upcast) {
RefPtr<Subclass> child = AdoptRef(new Subclass());
EXPECT_TRUE(child->unique());
RefPtr<SkRefCnt> parent = child;
EXPECT_TRUE(child);
EXPECT_TRUE(parent);
EXPECT_FALSE(child->unique());
EXPECT_FALSE(parent->unique());
}
// Counts the number of ref/unref operations (which require atomic operations)
// that are done.
class RefCountCounter : public SkRefCnt {
public:
void ref() const {
ref_count_changes_++;
SkRefCnt::ref();
}
void unref() const {
ref_count_changes_++;
SkRefCnt::unref();
}
int ref_count_changes() const { return ref_count_changes_; }
void ResetRefCountChanges() { ref_count_changes_ = 0; }
private:
mutable int ref_count_changes_ = 0;
};
TEST(RefPtrTest, ConstructionFromTemporary) {
// No ref count changes to move temporary into a local.
RefPtr<RefCountCounter> object = skia::AdoptRef(new RefCountCounter);
EXPECT_EQ(0, object->ref_count_changes());
// Only one change to share the pointer.
object->ResetRefCountChanges();
RefPtr<RefCountCounter> shared = skia::SharePtr(object.get());
EXPECT_EQ(1, object->ref_count_changes());
// Two ref count changes for the extra ref when passed as an argument, but no
// more.
object->ResetRefCountChanges();
auto do_nothing = [](RefPtr<RefCountCounter>) {};
do_nothing(object);
EXPECT_EQ(2, object->ref_count_changes());
// No ref count changes when passing a newly adopted ref as an argument.
auto lambda = [](RefPtr<RefCountCounter> arg) {
EXPECT_EQ(0, arg->ref_count_changes());
};
lambda(skia::AdoptRef(new RefCountCounter));
}
TEST(RefPtrTest, AssignmentFromTemporary) {
// No ref count changes to move temporary into a local.
RefPtr<RefCountCounter> object;
object = skia::AdoptRef(new RefCountCounter);
EXPECT_EQ(0, object->ref_count_changes());
// Only one change to share the pointer.
object->ResetRefCountChanges();
RefPtr<RefCountCounter> shared;
shared = skia::SharePtr(object.get());
EXPECT_EQ(1, object->ref_count_changes());
}
TEST(RefPtrTest, PassIntoArguments) {
// No ref count changes when passing an argument with Pass().
RefPtr<RefCountCounter> object = skia::AdoptRef(new RefCountCounter);
RefPtr<RefCountCounter> object2 = object.Pass();
auto lambda = [](RefPtr<RefCountCounter> arg) {
EXPECT_EQ(0, arg->ref_count_changes());
};
lambda(object2.Pass());
}
class DestructionNotifier : public SkRefCnt {
public:
DestructionNotifier(bool* flag) : flag_(flag) {}
~DestructionNotifier() override { *flag_ = true; }
private:
bool* flag_;
};
TEST(RefPtrTest, PassIntoSelf) {
bool is_destroyed = false;
RefPtr<DestructionNotifier> object =
skia::AdoptRef(new DestructionNotifier(&is_destroyed));
object = object.Pass();
ASSERT_FALSE(is_destroyed);
EXPECT_TRUE(object->unique());
}
} // namespace
} // namespace skia
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