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// Copyright 2021 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <algorithm>
#include <cstdint>
#include <tuple>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "src/utils/common.h"
#include "src/utils/constants.h"
namespace libgav1 {
namespace {
// Import all the constants in the anonymous namespace.
#include "src/scan_tables.inc"
class ScanOrderTest
: public testing::TestWithParam<std::tuple<TransformClass, TransformSize>> {
public:
ScanOrderTest() = default;
ScanOrderTest(const ScanOrderTest&) = delete;
ScanOrderTest& operator=(const ScanOrderTest&) = delete;
~ScanOrderTest() override = default;
protected:
TransformClass tx_class_ = std::get<0>(GetParam());
TransformSize tx_size_ = std::get<1>(GetParam());
};
TEST_P(ScanOrderTest, AllIndicesAreScannedExactlyOnce) {
const int tx_width = kTransformWidth[tx_size_];
const int tx_height = kTransformHeight[tx_size_];
int num_indices;
if (tx_class_ == kTransformClass2D || std::max(tx_width, tx_height) == 64) {
const int clamped_tx_width = std::min(32, tx_width);
const int clamped_tx_height = std::min(32, tx_height);
num_indices = clamped_tx_width * clamped_tx_height;
} else {
num_indices =
(std::max(tx_width, tx_height) > 16) ? 64 : tx_width * tx_height;
}
const uint16_t* const scan = kScan[tx_class_][tx_size_];
ASSERT_NE(scan, nullptr);
// Ensure that all the indices are scanned exactly once.
std::vector<int> scanned;
scanned.resize(num_indices);
for (int i = 0; i < num_indices; ++i) {
scanned[scan[i]]++;
}
EXPECT_THAT(scanned, testing::Each(1));
}
constexpr TransformClass kTestTransformClasses[] = {
kTransformClass2D, kTransformClassVertical, kTransformClassHorizontal};
constexpr TransformSize kTestTransformSizes[] = {
kTransformSize4x4, kTransformSize4x8, kTransformSize4x16,
kTransformSize8x4, kTransformSize8x8, kTransformSize8x16,
kTransformSize8x32, kTransformSize16x4, kTransformSize16x8,
kTransformSize16x16, kTransformSize16x32, kTransformSize16x64,
kTransformSize32x8, kTransformSize32x16, kTransformSize32x32,
kTransformSize32x64, kTransformSize64x16, kTransformSize64x32,
kTransformSize64x64};
INSTANTIATE_TEST_SUITE_P(
C, ScanOrderTest,
testing::Combine(testing::ValuesIn(kTestTransformClasses),
testing::ValuesIn(kTestTransformSizes)));
} // namespace
} // namespace libgav1
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