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// Copyright 2025 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/webapps/browser/image_visual_diff.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkColor.h"
namespace web_app {
class ImageDiffValueTest : public testing::Test {
public:
ImageDiffValueTest() = default;
const SkBitmap CreateBitmap(int width, int height, SkColor color) {
SkBitmap bitmap;
bitmap.allocN32Pixels(width, height);
bitmap.eraseColor(color);
return bitmap;
}
};
const int kWidth = 100;
const int kHeight = 100;
TEST_F(ImageDiffValueTest, NullImageDiff) {
EXPECT_FALSE(HasMoreThanTenPercentImageDiff(nullptr, nullptr));
const SkBitmap bitmap1(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
EXPECT_TRUE(HasMoreThanTenPercentImageDiff(&bitmap1, nullptr));
}
TEST_F(ImageDiffValueTest, TwoIdenticalImageDiff) {
const SkBitmap bitmap1(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
const SkBitmap bitmap2(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
EXPECT_FALSE(HasMoreThanTenPercentImageDiff(&bitmap1, &bitmap2));
}
TEST_F(ImageDiffValueTest, ImageWithMoreThanTenPercentImageDiff) {
const SkBitmap bitmap1(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
const SkBitmap bitmap2(CreateBitmap(kWidth, kHeight, SK_ColorWHITE));
EXPECT_TRUE(HasMoreThanTenPercentImageDiff(&bitmap1, &bitmap2));
}
TEST_F(ImageDiffValueTest, ImageWithLessThanTenPercentImageDiff) {
const SkBitmap bitmap1(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
const SkBitmap bitmap2(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
// To achieve less than 10% difference, change fewer than 1334 pixels. Change
// the first 13 rows. 13 rows * 100 columns = 1300 pixels. 1300 pixels * 0.75
// diff/pixel = 975 total difference sum. Percentage = 100 * 975 / 10000
// = 9.75, which is < 10%.
bitmap2.eraseArea(SkIRect::MakeXYWH(0, 0, kWidth, 13), SK_ColorWHITE);
EXPECT_FALSE(HasMoreThanTenPercentImageDiff(&bitmap1, &bitmap2));
}
TEST_F(ImageDiffValueTest, BlackImageComparedWithColoredImageDiff) {
const SkBitmap bitmap1(CreateBitmap(kWidth, kHeight, SK_ColorBLACK));
const SkBitmap bitmap2(CreateBitmap(kWidth, kHeight, SK_ColorRED));
EXPECT_TRUE(HasMoreThanTenPercentImageDiff(&bitmap1, &bitmap2));
}
} // namespace web_app
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