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// Copyright (c) the JPEG XL Project
// SPDX-License-Identifier: Apache-2.0
//
// 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 "hwy/contrib/image/image.h"
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <random>
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "hwy/contrib/image/image_test.cc"
#include "hwy/foreach_target.h" // IWYU pragma: keep
#include "hwy/highway.h"
#include "hwy/tests/test_util-inl.h"
HWY_BEFORE_NAMESPACE();
namespace hwy {
namespace HWY_NAMESPACE {
// Ensure we can always write full aligned vectors.
struct TestAlignedT {
template <typename T>
void operator()(T /*unused*/) const {
std::mt19937 rng(129);
std::uniform_int_distribution<int> dist(0, 16);
const ScalableTag<T> d;
for (size_t ysize = 1; ysize < 4; ++ysize) {
for (size_t xsize = 1; xsize < 64; ++xsize) {
Image<T> img(xsize, ysize);
for (size_t y = 0; y < ysize; ++y) {
T* HWY_RESTRICT row = img.MutableRow(y);
for (size_t x = 0; x < xsize; x += Lanes(d)) {
const auto values = Iota(d, static_cast<T>(dist(rng)));
Store(values, d, row + x);
}
}
// Sanity check to prevent optimizing out the writes
const auto x = std::uniform_int_distribution<size_t>(0, xsize - 1)(rng);
const auto y = std::uniform_int_distribution<size_t>(0, ysize - 1)(rng);
HWY_ASSERT(img.ConstRow(y)[x] < 16 + Lanes(d));
}
}
}
};
void TestAligned() { ForUnsignedTypes(TestAlignedT()); }
// Ensure we can write an unaligned vector starting at the last valid value.
struct TestUnalignedT {
template <typename T>
void operator()(T /*unused*/) const {
std::mt19937 rng(129);
std::uniform_int_distribution<int> dist(0, 3);
const ScalableTag<T> d;
for (size_t ysize = 1; ysize < 4; ++ysize) {
for (size_t xsize = 1; xsize < 128; ++xsize) {
Image<T> img(xsize, ysize);
img.InitializePaddingForUnalignedAccesses();
// This test reads padding, which only works if it was initialized,
// which only happens in MSAN builds.
#if HWY_IS_MSAN || HWY_IDE
// Initialize only the valid samples
for (size_t y = 0; y < ysize; ++y) {
T* HWY_RESTRICT row = img.MutableRow(y);
for (size_t x = 0; x < xsize; ++x) {
row[x] = static_cast<T>(1u << dist(rng));
}
}
// Read padding bits
auto accum = Zero(d);
for (size_t y = 0; y < ysize; ++y) {
T* HWY_RESTRICT row = img.MutableRow(y);
for (size_t x = 0; x < xsize; ++x) {
accum = Or(accum, LoadU(d, row + x));
}
}
// Ensure padding was zero
const size_t N = Lanes(d);
auto lanes = AllocateAligned<T>(N);
HWY_ASSERT(lanes);
Store(accum, d, lanes.get());
for (size_t i = 0; i < N; ++i) {
HWY_ASSERT(lanes[i] < 16);
}
#else // Check that writing padding does not overwrite valid samples
// Initialize only the valid samples
for (size_t y = 0; y < ysize; ++y) {
T* HWY_RESTRICT row = img.MutableRow(y);
for (size_t x = 0; x < xsize; ++x) {
row[x] = static_cast<T>(x);
}
}
// Zero padding and rightmost sample
for (size_t y = 0; y < ysize; ++y) {
T* HWY_RESTRICT row = img.MutableRow(y);
StoreU(Zero(d), d, row + xsize - 1);
}
// Ensure no samples except the rightmost were overwritten
for (size_t y = 0; y < ysize; ++y) {
T* HWY_RESTRICT row = img.MutableRow(y);
for (size_t x = 0; x < xsize - 1; ++x) {
HWY_ASSERT_EQ(static_cast<T>(x), row[x]);
}
}
#endif
}
}
}
};
void TestUnaligned() { ForUnsignedTypes(TestUnalignedT()); }
// NOLINTNEXTLINE(google-readability-namespace-comments)
} // namespace HWY_NAMESPACE
} // namespace hwy
HWY_AFTER_NAMESPACE();
#if HWY_ONCE
namespace hwy {
HWY_BEFORE_TEST(ImageTest);
HWY_EXPORT_AND_TEST_P(ImageTest, TestAligned);
HWY_EXPORT_AND_TEST_P(ImageTest, TestUnaligned);
} // namespace hwy
#endif
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