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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/viz/common/surfaces/parent_local_surface_id_allocator.h"
#include <memory>
#include "testing/gtest/include/gtest/gtest.h"
// ParentLocalSurfaceIdAllocator has 2 accessors which do not alter state:
// - GetCurrentLocalSurfaceId()
// - is_allocation_suppressed()
//
// For every operation which changes state we can test:
// - the operation completed as expected,
// - the accessors did not change, and/or
// - the accessors changed in the way we expected.
namespace viz {
class ParentLocalSurfaceIdAllocatorTest : public testing::Test {
public:
ParentLocalSurfaceIdAllocatorTest() = default;
ParentLocalSurfaceIdAllocatorTest(const ParentLocalSurfaceIdAllocatorTest&) =
delete;
ParentLocalSurfaceIdAllocatorTest& operator=(
const ParentLocalSurfaceIdAllocatorTest&) = delete;
~ParentLocalSurfaceIdAllocatorTest() override = default;
ParentLocalSurfaceIdAllocator& allocator() { return *allocator_.get(); }
LocalSurfaceId GenerateChildLocalSurfaceId() {
const LocalSurfaceId& current_local_surface_id =
allocator_->GetCurrentLocalSurfaceId();
return LocalSurfaceId(current_local_surface_id.parent_sequence_number(),
current_local_surface_id.child_sequence_number() + 1,
current_local_surface_id.embed_token());
}
// testing::Test:
void SetUp() override {
testing::Test::SetUp();
allocator_ = std::make_unique<ParentLocalSurfaceIdAllocator>();
}
void TearDown() override {
allocator_.reset();
}
private:
std::unique_ptr<ParentLocalSurfaceIdAllocator> allocator_;
};
// UpdateFromChild() on a parent allocator should accept the child's sequence
// number. But it should continue to use its own parent sequence number and
// embed_token.
TEST_F(ParentLocalSurfaceIdAllocatorTest,
UpdateFromChildOnlyUpdatesExpectedLocalSurfaceIdComponents) {
allocator().GenerateId();
LocalSurfaceId preupdate_local_surface_id =
allocator().GetCurrentLocalSurfaceId();
LocalSurfaceId child_local_surface_id = GenerateChildLocalSurfaceId();
const LocalSurfaceId& child_allocated_local_surface_id =
child_local_surface_id;
EXPECT_EQ(preupdate_local_surface_id.parent_sequence_number(),
child_allocated_local_surface_id.parent_sequence_number());
EXPECT_NE(preupdate_local_surface_id.child_sequence_number(),
child_allocated_local_surface_id.child_sequence_number());
EXPECT_EQ(preupdate_local_surface_id.embed_token(),
child_allocated_local_surface_id.embed_token());
bool changed = allocator().UpdateFromChild(child_local_surface_id);
EXPECT_TRUE(changed);
const LocalSurfaceId& postupdate_local_surface_id =
allocator().GetCurrentLocalSurfaceId();
EXPECT_EQ(postupdate_local_surface_id.parent_sequence_number(),
child_allocated_local_surface_id.parent_sequence_number());
EXPECT_EQ(postupdate_local_surface_id.child_sequence_number(),
child_allocated_local_surface_id.child_sequence_number());
EXPECT_EQ(postupdate_local_surface_id.embed_token(),
child_allocated_local_surface_id.embed_token());
EXPECT_FALSE(allocator().is_allocation_suppressed());
}
// GenerateId() on a parent allocator should monotonically increment the parent
// sequence number and use the previous embed_token.
TEST_F(ParentLocalSurfaceIdAllocatorTest,
GenerateIdOnlyUpdatesExpectedLocalSurfaceIdComponents) {
allocator().GenerateId();
LocalSurfaceId pregenerateid_local_surface_id =
allocator().GetCurrentLocalSurfaceId();
allocator().GenerateId();
const LocalSurfaceId& returned_local_surface_id =
allocator().GetCurrentLocalSurfaceId();
const LocalSurfaceId& postgenerateid_local_surface_id =
allocator().GetCurrentLocalSurfaceId();
EXPECT_EQ(pregenerateid_local_surface_id.parent_sequence_number() + 1,
postgenerateid_local_surface_id.parent_sequence_number());
EXPECT_EQ(pregenerateid_local_surface_id.child_sequence_number(),
postgenerateid_local_surface_id.child_sequence_number());
EXPECT_EQ(pregenerateid_local_surface_id.embed_token(),
postgenerateid_local_surface_id.embed_token());
EXPECT_EQ(returned_local_surface_id, allocator().GetCurrentLocalSurfaceId());
EXPECT_FALSE(allocator().is_allocation_suppressed());
}
} // namespace viz
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