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// Copyright 2017 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/safe_browsing/content/common/visual_utils.h"
#include <array>
#include "base/containers/span.h"
#include "base/test/scoped_feature_list.h"
#include "base/test/test_discardable_memory_allocator.h"
#include "components/safe_browsing/core/common/features.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/private/chromium/SkPMColor.h"
namespace safe_browsing::visual_utils {
namespace {
const SkPMColor kSkPMRed = SkPMColorSetARGB(255, 255, 0, 0);
const SkPMColor kSkPMGreen = SkPMColorSetARGB(255, 0, 255, 0);
const SkPMColor kSkPMBlue = SkPMColorSetARGB(255, 0, 0, 255);
} // namespace
using ::testing::FloatEq;
class VisualUtilsTest : public testing::Test {
protected:
void SetUp() override {
base::DiscardableMemoryAllocator::SetInstance(&test_allocator_);
sk_sp<SkColorSpace> rec2020 = SkColorSpace::MakeRGB(
{2.22222f, 0.909672f, 0.0903276f, 0.222222f, 0.0812429f, 0, 0},
SkNamedGamut::kRec2020);
SkImageInfo bitmap_info = SkImageInfo::MakeN32(
1000, 1000, SkAlphaType::kUnpremul_SkAlphaType, rec2020);
ASSERT_TRUE(bitmap_.tryAllocPixels(bitmap_info));
}
void TearDown() override {
base::DiscardableMemoryAllocator::SetInstance(nullptr);
}
void ExpectPixel(base::span<const unsigned char> pixel,
const VisualFeatures::BlurredImage& image,
size_t row,
size_t col) {
ASSERT_LT(static_cast<int>(row), image.height());
ASSERT_LT(static_cast<int>(col), image.width());
EXPECT_EQ(pixel[0], static_cast<unsigned char>(
image.data()[3 * row * image.width() + 3 * col]))
<< "R component of pixel at row " << row << " and column " << col
<< " is incorrect.";
EXPECT_EQ(pixel[1],
static_cast<unsigned char>(
image.data()[3 * row * image.width() + 3 * col + 1]))
<< "G component of pixel at row " << row << " and column " << col
<< " is incorrect.";
EXPECT_EQ(pixel[2],
static_cast<unsigned char>(
image.data()[3 * row * image.width() + 3 * col + 2]))
<< "B component of pixel at row " << row << " and column " << col
<< " is incorrect.";
}
// A test bitmap to work with. Initialized to be 1000x1000 in the Rec 2020
// color space.
SkBitmap bitmap_;
private:
// A DiscardableMemoryAllocator is needed for certain Skia operations.
base::TestDiscardableMemoryAllocator test_allocator_;
};
TEST_F(VisualUtilsTest, BlurImageWhite) {
VisualFeatures::BlurredImage blurred;
// Draw white over the image
bitmap_.erase(SK_ColorWHITE, SkIRect::MakeXYWH(0, 0, 1000, 1000));
ASSERT_TRUE(GetBlurredImage(bitmap_, &blurred));
constexpr std::array<const unsigned char, 3> kWhite = {0xff, 0xff, 0xff};
#if BUILDFLAG(IS_ANDROID)
ASSERT_EQ(18, blurred.width());
ASSERT_EQ(32, blurred.height());
ASSERT_EQ(3u * 18u * 32u, blurred.data().size());
for (size_t i = 0; i < 32u; i++) {
for (size_t j = 0; i < 18u; i++) {
ExpectPixel(kWhite, blurred, i, j);
}
}
#else
ASSERT_EQ(48, blurred.width());
ASSERT_EQ(48, blurred.height());
ASSERT_EQ(3u * 48u * 48u, blurred.data().size());
for (size_t i = 0; i < 48u; i++) {
for (size_t j = 0; i < 48u; i++) {
ExpectPixel(kWhite, blurred, i, j);
}
}
#endif
}
TEST_F(VisualUtilsTest, BlurImageRed) {
VisualFeatures::BlurredImage blurred;
// Draw red over the image.
for (int x = 0; x < 1000; x++)
for (int y = 0; y < 1000; y++)
*bitmap_.getAddr32(x, y) = kSkPMRed;
ASSERT_TRUE(GetBlurredImage(bitmap_, &blurred));
constexpr std::array<const unsigned char, 3> kRed = {0xff, 0x00, 0x00};
#if BUILDFLAG(IS_ANDROID)
ASSERT_EQ(18, blurred.width());
ASSERT_EQ(32, blurred.height());
ASSERT_EQ(3u * 18u * 32u, blurred.data().size());
for (size_t i = 0; i < 32u; i++) {
for (size_t j = 0; i < 18u; i++) {
ExpectPixel(kRed, blurred, i, j);
}
}
#else
ASSERT_EQ(48, blurred.width());
ASSERT_EQ(48, blurred.height());
ASSERT_EQ(3u * 48u * 48u, blurred.data().size());
for (size_t i = 0; i < 48u; i++) {
for (size_t j = 0; i < 48u; i++) {
ExpectPixel(kRed, blurred, i, j);
}
}
#endif
}
TEST_F(VisualUtilsTest, BlurImageHalfWhiteHalfBlack) {
VisualFeatures::BlurredImage blurred;
// Draw black over half the image.
bitmap_.erase(SK_ColorBLACK, SkIRect::MakeXYWH(0, 0, 1000, 500));
// Draw white over half the image
bitmap_.erase(SK_ColorWHITE, SkIRect::MakeXYWH(0, 500, 1000, 1000));
ASSERT_TRUE(GetBlurredImage(bitmap_, &blurred));
constexpr std::array<const unsigned char, 3> kBlack = {0x00, 0x00, 0x00};
constexpr std::array<const unsigned char, 3> kWhite = {0xff, 0xff, 0xff};
#if BUILDFLAG(IS_ANDROID)
ASSERT_EQ(18, blurred.width());
ASSERT_EQ(32, blurred.height());
ASSERT_EQ(3u * 18u * 32u, blurred.data().size());
// The middle blocks may have been blurred to something between white and
// black, so only verify the first 14 and last 14 rows.
for (size_t i = 0; i < 14u; i++) {
for (size_t j = 0; j < 18u; j++) {
ExpectPixel(kBlack, blurred, i, j);
}
}
for (size_t i = 18u; i < 32u; i++) {
for (size_t j = 0; j < 18u; j++) {
ExpectPixel(kWhite, blurred, i, j);
}
}
#else
ASSERT_EQ(48, blurred.width());
ASSERT_EQ(48, blurred.height());
ASSERT_EQ(3u * 48u * 48u, blurred.data().size());
// The middle blocks may have been blurred to something between white and
// black, so only verify the first 22 and last 22 rows.
for (size_t i = 0; i < 22u; i++) {
for (size_t j = 0; j < 48u; j++) {
ExpectPixel(kBlack, blurred, i, j);
}
}
for (size_t i = 26u; i < 48u; i++) {
for (size_t j = 0; j < 48u; j++) {
ExpectPixel(kWhite, blurred, i, j);
}
}
#endif
}
TEST_F(VisualUtilsTest, BlockMeanAverageOneBlock) {
// Draw black over half the image.
bitmap_.erase(SK_ColorBLACK, SkIRect::MakeXYWH(0, 0, 1000, 500));
// Draw white over half the image
bitmap_.erase(SK_ColorWHITE, SkIRect::MakeXYWH(0, 500, 1000, 1000));
std::unique_ptr<SkBitmap> blocks = BlockMeanAverage(bitmap_, 1000);
ASSERT_EQ(1, blocks->width());
ASSERT_EQ(1, blocks->height());
EXPECT_EQ(blocks->getColor(0, 0), SkColorSetRGB(127, 127, 127));
}
TEST_F(VisualUtilsTest, BlockMeanAveragePartialBlocks) {
// Draw a white, red, green, and blue box with the expected block sizes.
bitmap_.erase(SK_ColorWHITE, SkIRect::MakeXYWH(0, 0, 600, 600));
for (int x = 600; x < 1000; x++)
for (int y = 0; y < 600; y++)
*bitmap_.getAddr32(x, y) = kSkPMRed;
for (int x = 0; x < 600; x++)
for (int y = 600; y < 1000; y++)
*bitmap_.getAddr32(x, y) = kSkPMGreen;
for (int x = 600; x < 1000; x++)
for (int y = 600; y < 1000; y++)
*bitmap_.getAddr32(x, y) = kSkPMBlue;
std::unique_ptr<SkBitmap> blocks = BlockMeanAverage(bitmap_, 600);
ASSERT_EQ(2, blocks->width());
ASSERT_EQ(2, blocks->height());
EXPECT_EQ(blocks->getColor(0, 0), SK_ColorWHITE);
EXPECT_EQ(*blocks->getAddr32(1, 0), kSkPMRed);
EXPECT_EQ(*blocks->getAddr32(0, 1), kSkPMGreen);
EXPECT_EQ(*blocks->getAddr32(1, 1), kSkPMBlue);
}
TEST_F(VisualUtilsTest, NonSquareBlurredImage) {
base::test::ScopedFeatureList feature_list;
feature_list.InitAndEnableFeatureWithParameters(
kVisualFeaturesSizes, {{"phash_width", "108"}, {"phash_height", "192"}});
VisualFeatures::BlurredImage blurred;
// Draw white over the image
bitmap_.erase(SK_ColorWHITE, SkIRect::MakeXYWH(0, 0, 1000, 1000));
ASSERT_TRUE(GetBlurredImage(bitmap_, &blurred));
ASSERT_EQ(18, blurred.width());
ASSERT_EQ(32, blurred.height());
ASSERT_EQ(3u * 18u * 32u, blurred.data().size());
for (size_t i = 0; i < 18u * 32u; i++) {
EXPECT_EQ('\xff', blurred.data()[3 * i]);
EXPECT_EQ('\xff', blurred.data()[3 * i + 1]);
EXPECT_EQ('\xff', blurred.data()[3 * i + 2]);
}
}
} // namespace safe_browsing::visual_utils
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