示例#1
0
static void TestPictureTypefaceSerialization(skiatest::Reporter* reporter) {
    {
        // Load typeface from file to test CreateFromFile with index.
        auto data = GetResourceAsData("fonts/test.ttc");
        auto typeface = SkTypeface::MakeFromStream(new SkMemoryStream(std::move(data)), 1);
        if (!typeface) {
            INFOF(reporter, "Could not run fontstream test because test.ttc not found.");
        } else {
            serialize_and_compare_typeface(std::move(typeface), "A!", reporter);
        }
    }

    {
        // Load typeface as stream to create with axis settings.
        std::unique_ptr<SkStreamAsset> distortable(GetResourceAsStream("fonts/Distortable.ttf"));
        if (!distortable) {
            INFOF(reporter, "Could not run fontstream test because Distortable.ttf not found.");
        } else {
            SkFixed axis = SK_FixedSqrt2;
            sk_sp<SkTypeface> typeface(SkTypeface::MakeFromFontData(
                skstd::make_unique<SkFontData>(std::move(distortable), 0, &axis, 1)));
            if (!typeface) {
                INFOF(reporter, "Could not run fontstream test because Distortable.ttf not created.");
            } else {
                serialize_and_compare_typeface(std::move(typeface), "abc", reporter);
            }
        }
    }
}
示例#2
0
DEF_TEST(ColorSpace_Serialize, r) {
    test_serialize(r, SkColorSpace::MakeSRGB(), true);
    test_serialize(r, SkColorSpace::MakeSRGBLinear(), true);

    auto test = [&](const char* path) {
        sk_sp<SkData> data = GetResourceAsData(path);

        skcms_ICCProfile profile;
        REPORTER_ASSERT(r, skcms_Parse(data->data(), data->size(), &profile));

        sk_sp<SkColorSpace> space = SkColorSpace::Make(profile);
        REPORTER_ASSERT(r, space);

        test_serialize(r, space, false);
    };
    test("icc_profiles/HP_ZR30w.icc");
    test("icc_profiles/HP_Z32x.icc");

    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 1.0f;
    fn.d = 0.5f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = 1.0f;
    skcms_Matrix3x3 toXYZ = {{
        { 1, 0, 0 },
        { 0, 1, 0 },
        { 0, 0, 1 },
    }};
    test_serialize(r, SkColorSpace::MakeRGB(fn, toXYZ), false);
}
示例#3
0
DEF_TEST(Codec_trunc, r) {
    sk_sp<SkData> data(GetResourceAsData("images/box.gif"));
    if (!data) {
        return;
    }
    SkCodec::MakeFromData(SkData::MakeSubset(data.get(), 0, 23))->getFrameInfo();
}
示例#4
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DEF_TEST(ColorSpace_Equals, r) {
    sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();

    auto parse = [&](const char* path) {
        sk_sp<SkData> data = GetResourceAsData(path);

        skcms_ICCProfile profile;
        REPORTER_ASSERT(r, skcms_Parse(data->data(), data->size(), &profile));

        sk_sp<SkColorSpace> space = SkColorSpace::Make(profile);
        REPORTER_ASSERT(r, space);

        return space;
    };
    sk_sp<SkColorSpace> z30 = parse("icc_profiles/HP_ZR30w.icc");
    sk_sp<SkColorSpace> z32 = parse("icc_profiles/HP_Z32x.icc");

    skcms_TransferFunction fn;
    fn.a = 1.0f;
    fn.b = 0.0f;
    fn.c = 1.0f;
    fn.d = 0.5f;
    fn.e = 0.0f;
    fn.f = 0.0f;
    fn.g = 1.0f;
    skcms_Matrix3x3 toXYZ = {{
        { 1, 0, 0 },
        { 0, 1, 0 },
        { 0, 0, 1 },
    }};
    sk_sp<SkColorSpace> rgb4 = SkColorSpace::MakeRGB(fn, toXYZ);

    REPORTER_ASSERT(r, SkColorSpace::Equals(nullptr, nullptr));
    REPORTER_ASSERT(r, SkColorSpace::Equals(srgb.get(), srgb.get()));
    REPORTER_ASSERT(r, SkColorSpace::Equals(z30.get(), z30.get()));
    REPORTER_ASSERT(r, SkColorSpace::Equals(z32.get(), z32.get()));
    REPORTER_ASSERT(r, SkColorSpace::Equals(rgb4.get(), rgb4.get()));

    REPORTER_ASSERT(r, !SkColorSpace::Equals(nullptr, srgb.get()));
    REPORTER_ASSERT(r, !SkColorSpace::Equals(srgb.get(), nullptr));
    REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), srgb.get()));
    REPORTER_ASSERT(r, !SkColorSpace::Equals(z32.get(), z30.get()));
    REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), rgb4.get()));
    REPORTER_ASSERT(r, !SkColorSpace::Equals(srgb.get(), rgb4.get()));
}
示例#5
0
// 565 does not support alpha, but there is no reason for it not to support an
// animated image with a frame that has alpha but then blends onto an opaque
// frame making the result opaque. Test that we can decode such a frame.
DEF_TEST(Codec_565, r) {
    sk_sp<SkData> data(GetResourceAsData("images/blendBG.webp"));
    if (!data) {
        return;
    }
    std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(std::move(data)));
    auto info = codec->getInfo().makeColorType(kRGB_565_SkColorType);
    SkBitmap bm;
    bm.allocPixels(info);

    SkCodec::Options options;
    options.fFrameIndex = 1;
    options.fPriorFrame = SkCodec::kNone;

    const auto result = codec->getPixels(info, bm.getPixels(), bm.rowBytes(),
                                         &options);
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);
}
示例#6
0
// Verify that a webp image can be animated scaled down. This image has a
// kRestoreBG frame, so it is an interesting image to test. After decoding that
// frame, we have to erase its rectangle. The rectangle has to be adjusted
// based on the scaled size.
DEF_TEST(AndroidCodec_animated, r) {
    if (GetResourcePath().isEmpty()) {
        return;
    }

    const char* file = "images/required.webp";
    sk_sp<SkData> data(GetResourceAsData(file));
    if (!data) {
        ERRORF(r, "Missing %s", file);
        return;
    }

    auto codec = SkAndroidCodec::MakeFromCodec(SkCodec::MakeFromData(std::move(data)));
    if (!codec) {
        ERRORF(r, "Failed to decode %s", file);
        return;
    }

    auto info = codec->getInfo().makeAlphaType(kPremul_SkAlphaType);

    for (int sampleSize : { 8, 32, 100 }) {
        auto dimensions = codec->codec()->getScaledDimensions(1.0f / sampleSize);
        info = info.makeWH(dimensions.width(), dimensions.height());
        SkBitmap bm;
        bm.allocPixels(info);

        SkCodec::Options options;
        for (int i = 0; i < codec->codec()->getFrameCount(); ++i) {
            SkCodec::FrameInfo frameInfo;
            REPORTER_ASSERT(r, codec->codec()->getFrameInfo(i, &frameInfo));
            if (5 == i) {
                REPORTER_ASSERT(r, frameInfo.fDisposalMethod
                        == SkCodecAnimation::DisposalMethod::kRestoreBGColor);
            }
            options.fFrameIndex = i;
            options.fPriorFrame = i - 1;
            info = info.makeAlphaType(frameInfo.fAlphaType);

            const auto result = codec->codec()->getPixels(info, bm.getPixels(), bm.rowBytes(),
                                                          &options);
            REPORTER_ASSERT(r, result == SkCodec::kSuccess);
        }
    }
}
示例#7
0
// Test that some SkCodecs do not attempt to read input beyond the logical
// end of the data. Some other SkCodecs do, but some Android apps rely on not
// doing so for PNGs. Test on other formats that work.
DEF_TEST(Codec_end, r) {
    for (const char* path : { "images/plane.png",
                              "images/yellow_rose.png",
                              "images/plane_interlaced.png",
                              "images/google_chrome.ico",
                              "images/color_wheel.ico",
                              "images/mandrill.wbmp",
                              "images/randPixels.bmp",
                              }) {
        sk_sp<SkData> data = GetResourceAsData(path);
        if (!data) {
            continue;
        }

        const int kNumImages = 2;
        const size_t size = data->size();
        sk_sp<SkData> multiData = SkData::MakeUninitialized(size * kNumImages);
        void* dst = multiData->writable_data();
        for (int i = 0; i < kNumImages; i++) {
            memcpy(SkTAddOffset<void>(dst, size * i), data->data(), size);
        }
        data.reset();

        SkMemoryStream stream(std::move(multiData));
        for (int i = 0; i < kNumImages; ++i) {
            std::unique_ptr<SkCodec> codec(SkCodec::MakeFromStream(
                                                   skstd::make_unique<UnowningStream>(&stream)));
            if (!codec) {
                ERRORF(r, "Failed to create a codec from %s, iteration %i", path, i);
                continue;
            }

            auto info = codec->getInfo().makeColorType(kN32_SkColorType);
            SkBitmap bm;
            bm.allocPixels(info);

            auto result = codec->getPixels(bm.info(), bm.getPixels(), bm.rowBytes());
            if (result != SkCodec::kSuccess) {
                ERRORF(r, "Failed to getPixels from %s, iteration %i error %i", path, i, result);
                continue;
            }
        }
    }
}
示例#8
0
// This test uses file system operations that don't work out of the
// box on iOS. It's likely that we don't need them on iOS. Ignoring for now.
// TODO(stephana): Re-evaluate if we need this in the future.
DEF_TEST(StreamPeek, reporter) {
    // Test a memory stream.
    const char gAbcs[] = "abcdefghijklmnopqrstuvwxyz";
    SkMemoryStream memStream(gAbcs, strlen(gAbcs), false);
    test_fully_peekable_stream(reporter, &memStream, memStream.getLength());

    // Test an arbitrary file stream. file streams do not support peeking.
    auto tmpdir = skiatest::GetTmpDir();
    if (tmpdir.isEmpty()) {
        ERRORF(reporter, "no tmp dir!");
        return;
    }
    auto path = SkOSPath::Join(tmpdir.c_str(), "file");
    {
        SkFILEWStream wStream(path.c_str());
        constexpr char filename[] = "images/baby_tux.webp";
        auto data = GetResourceAsData(filename);
        if (!data || data->size() == 0) {
            ERRORF(reporter, "resource missing: %s\n", filename);
            return;
        }
        if (!wStream.isValid() || !wStream.write(data->data(), data->size())) {
            ERRORF(reporter, "error wrtiting to file %s", path.c_str());
            return;
        }
    }
    SkFILEStream fileStream(path.c_str());
    REPORTER_ASSERT(reporter, fileStream.isValid());
    if (!fileStream.isValid()) {
        return;
    }
    SkAutoMalloc storage(fileStream.getLength());
    for (size_t i = 1; i < fileStream.getLength(); i++) {
        REPORTER_ASSERT(reporter, fileStream.peek(storage.get(), i) == 0);
    }

    // Now test some FrontBufferedStreams
    for (size_t i = 1; i < memStream.getLength(); i++) {
        test_peeking_front_buffered_stream(reporter, memStream, i);
    }
}
示例#9
0
DEF_TEST(Codec_frames, r) {
    #define kOpaque         kOpaque_SkAlphaType
    #define kUnpremul       kUnpremul_SkAlphaType
    #define kKeep           SkCodecAnimation::DisposalMethod::kKeep
    #define kRestoreBG      SkCodecAnimation::DisposalMethod::kRestoreBGColor
    #define kRestorePrev    SkCodecAnimation::DisposalMethod::kRestorePrevious
    static const struct {
        const char*                                   fName;
        int                                           fFrameCount;
        // One less than fFramecount, since the first frame is always
        // independent.
        std::vector<int>                              fRequiredFrames;
        // Same, since the first frame should match getInfo
        std::vector<SkAlphaType>                      fAlphas;
        // The size of this one should match fFrameCount for animated, empty
        // otherwise.
        std::vector<int>                              fDurations;
        int                                           fRepetitionCount;
        std::vector<SkCodecAnimation::DisposalMethod> fDisposalMethods;
    } gRecs[] = {
        { "images/required.gif", 7,
            { 0, 1, 2, 3, 4, 5 },
            { kOpaque, kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul },
            { 100, 100, 100, 100, 100, 100, 100 },
            0,
            { kKeep, kRestoreBG, kKeep, kKeep, kKeep, kRestoreBG, kKeep } },
        { "images/alphabetAnim.gif", 13,
            { SkCodec::kNone, 0, 0, 0, 0, 5, 6, SkCodec::kNone,
              SkCodec::kNone, 9, 10, 11 },
            { kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul,
              kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul },
            { 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100 },
            0,
            { kKeep, kRestorePrev, kRestorePrev, kRestorePrev, kRestorePrev,
              kRestoreBG, kKeep, kRestoreBG, kRestoreBG, kKeep, kKeep,
              kRestoreBG, kKeep } },
        { "images/randPixelsAnim2.gif", 4,
            // required frames
            { 0, 0, 1 },
            // alphas
            { kOpaque, kOpaque, kOpaque },
            // durations
            { 0, 1000, 170, 40 },
            // repetition count
            0,
            { kKeep, kKeep, kRestorePrev, kKeep } },
        { "images/randPixelsAnim.gif", 13,
            // required frames
            { 0, 1, 2, 3, 4, 3, 6, 7, 7, 7, 9, 9 },
            { kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul,
              kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul, kUnpremul },
            // durations
            { 0, 1000, 170, 40, 220, 7770, 90, 90, 90, 90, 90, 90, 90 },
            // repetition count
            0,
            { kKeep, kKeep, kKeep, kKeep, kRestoreBG, kRestoreBG, kRestoreBG,
              kRestoreBG, kRestorePrev, kRestoreBG, kRestorePrev, kRestorePrev,
              kRestorePrev,  } },
        { "images/box.gif", 1, {}, {}, {}, 0, { kKeep } },
        { "images/color_wheel.gif", 1, {}, {}, {}, 0, { kKeep } },
        { "images/test640x479.gif", 4, { 0, 1, 2 },
                { kOpaque, kOpaque, kOpaque },
                { 200, 200, 200, 200 },
                SkCodec::kRepetitionCountInfinite,
                { kKeep, kKeep, kKeep, kKeep } },
        { "images/colorTables.gif", 2, { 0 }, { kOpaque }, { 1000, 1000 }, 5,
                { kKeep, kKeep } },

        { "images/arrow.png",  1, {}, {}, {}, 0, {} },
        { "images/google_chrome.ico", 1, {}, {}, {}, 0, {} },
        { "images/brickwork-texture.jpg", 1, {}, {}, {}, 0, {} },
#if defined(SK_CODEC_DECODES_RAW) && (!defined(_WIN32))
        { "images/dng_with_preview.dng", 1, {}, {}, {}, 0, {} },
#endif
        { "images/mandrill.wbmp", 1, {}, {}, {}, 0, {} },
        { "images/randPixels.bmp", 1, {}, {}, {}, 0, {} },
        { "images/yellow_rose.webp", 1, {}, {}, {}, 0, {} },
        { "images/webp-animated.webp", 3, { 0, 1 }, { kOpaque, kOpaque },
            { 1000, 500, 1000 }, SkCodec::kRepetitionCountInfinite,
            { kKeep, kKeep, kKeep } },
        { "images/blendBG.webp", 7, { 0, SkCodec::kNone, SkCodec::kNone, SkCodec::kNone,
                               4, 4 },
            { kOpaque, kOpaque, kUnpremul, kOpaque, kUnpremul, kUnpremul },
            { 525, 500, 525, 437, 609, 729, 444 }, 7,
            { kKeep, kKeep, kKeep, kKeep, kKeep, kKeep, kKeep } },
        { "images/required.webp", 7,
            { 0, 1, 1, SkCodec::kNone, 4, 4 },
            { kOpaque, kUnpremul, kUnpremul, kOpaque, kOpaque, kOpaque },
            { 100, 100, 100, 100, 100, 100, 100 },
            1,
            { kKeep, kRestoreBG, kKeep, kKeep, kKeep, kRestoreBG, kKeep } },
    };
    #undef kOpaque
    #undef kUnpremul
    #undef kKeep
    #undef kRestorePrev
    #undef kRestoreBG

    for (const auto& rec : gRecs) {
        sk_sp<SkData> data(GetResourceAsData(rec.fName));
        if (!data) {
            // Useful error statement, but sometimes people run tests without
            // resources, and they do not want to see these messages.
            //ERRORF(r, "Missing resources? Could not find '%s'", rec.fName);
            continue;
        }

        std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(data));
        if (!codec) {
            ERRORF(r, "Failed to create an SkCodec from '%s'", rec.fName);
            continue;
        }

        {
            SkCodec::FrameInfo frameInfo;
            REPORTER_ASSERT(r, !codec->getFrameInfo(0, &frameInfo));
        }

        const int repetitionCount = codec->getRepetitionCount();
        if (repetitionCount != rec.fRepetitionCount) {
            ERRORF(r, "%s repetition count does not match! expected: %i\tactual: %i",
                      rec.fName, rec.fRepetitionCount, repetitionCount);
        }

        const int expected = rec.fFrameCount;
        if (rec.fRequiredFrames.size() + 1 != static_cast<size_t>(expected)) {
            ERRORF(r, "'%s' has wrong number entries in fRequiredFrames; expected: %i\tactual: %i",
                   rec.fName, expected - 1, rec.fRequiredFrames.size());
            continue;
        }

        if (expected > 1) {
            if (rec.fDurations.size() != static_cast<size_t>(expected)) {
                ERRORF(r, "'%s' has wrong number entries in fDurations; expected: %i\tactual: %i",
                       rec.fName, expected, rec.fDurations.size());
                continue;
            }

            if (rec.fAlphas.size() + 1 != static_cast<size_t>(expected)) {
                ERRORF(r, "'%s' has wrong number entries in fAlphas; expected: %i\tactual: %i",
                       rec.fName, expected - 1, rec.fAlphas.size());
                continue;
            }

            if (rec.fDisposalMethods.size() != static_cast<size_t>(expected)) {
                ERRORF(r, "'%s' has wrong number entries in fDisposalMethods; "
                       "expected %i\tactual: %i",
                       rec.fName, expected, rec.fDisposalMethods.size());
                continue;
            }
        }

        enum class TestMode {
            kVector,
            kIndividual,
        };

        for (auto mode : { TestMode::kVector, TestMode::kIndividual }) {
            // Re-create the codec to reset state and test parsing.
            codec = SkCodec::MakeFromData(data);

            int frameCount;
            std::vector<SkCodec::FrameInfo> frameInfos;
            switch (mode) {
                case TestMode::kVector:
                    frameInfos = codec->getFrameInfo();
                    // getFrameInfo returns empty set for non-animated.
                    frameCount = frameInfos.empty() ? 1 : frameInfos.size();
                    break;
                case TestMode::kIndividual:
                    frameCount = codec->getFrameCount();
                    break;
            }

            if (frameCount != expected) {
                ERRORF(r, "'%s' expected frame count: %i\tactual: %i",
                       rec.fName, expected, frameCount);
                continue;
            }

            // From here on, we are only concerned with animated images.
            if (1 == frameCount) {
                continue;
            }

            for (int i = 0; i < frameCount; i++) {
                SkCodec::FrameInfo frameInfo;
                switch (mode) {
                    case TestMode::kVector:
                        frameInfo = frameInfos[i];
                        break;
                    case TestMode::kIndividual:
                        REPORTER_ASSERT(r, codec->getFrameInfo(i, nullptr));
                        REPORTER_ASSERT(r, codec->getFrameInfo(i, &frameInfo));
                        break;
                }

                if (rec.fDurations[i] != frameInfo.fDuration) {
                    ERRORF(r, "%s frame %i's durations do not match! expected: %i\tactual: %i",
                           rec.fName, i, rec.fDurations[i], frameInfo.fDuration);
                }

                auto to_string = [](SkAlphaType alpha) {
                    switch (alpha) {
                        case kUnpremul_SkAlphaType:
                            return "unpremul";
                        case kOpaque_SkAlphaType:
                            return "opaque";
                        default:
                            SkASSERT(false);
                            return "unknown";
                    }
                };

                auto expectedAlpha = 0 == i ? codec->getInfo().alphaType() : rec.fAlphas[i-1];
                auto alpha = frameInfo.fAlphaType;
                if (expectedAlpha != alpha) {
                    ERRORF(r, "%s's frame %i has wrong alpha type! expected: %s\tactual: %s",
                           rec.fName, i, to_string(expectedAlpha), to_string(alpha));
                }

                if (0 == i) {
                    REPORTER_ASSERT(r, frameInfo.fRequiredFrame == SkCodec::kNone);
                } else if (rec.fRequiredFrames[i-1] != frameInfo.fRequiredFrame) {
                    ERRORF(r, "%s's frame %i has wrong dependency! expected: %i\tactual: %i",
                           rec.fName, i, rec.fRequiredFrames[i-1], frameInfo.fRequiredFrame);
                }

                REPORTER_ASSERT(r, frameInfo.fDisposalMethod == rec.fDisposalMethods[i]);
            }

            if (TestMode::kIndividual == mode) {
                // No need to test decoding twice.
                continue;
            }

            // Compare decoding in multiple ways:
            // - Start from scratch for each frame. |codec| will have to decode the required frame
            //   (and any it depends on) to decode. This is stored in |cachedFrames|.
            // - Provide the frame that a frame depends on, so |codec| just has to blend.
            // - Provide a frame after the required frame, which will be covered up by the newest
            //   frame.
            // All should look the same.
            std::vector<SkBitmap> cachedFrames(frameCount);
            const auto info = codec->getInfo().makeColorType(kN32_SkColorType);

            auto decode = [&](SkBitmap* bm, int index, int cachedIndex) {
                auto decodeInfo = info;
                if (index > 0) {
                    decodeInfo = info.makeAlphaType(frameInfos[index].fAlphaType);
                }
                bm->allocPixels(decodeInfo);
                if (cachedIndex != SkCodec::kNone) {
                    // First copy the pixels from the cached frame
                    const bool success = sk_tool_utils::copy_to(bm, kN32_SkColorType,
                            cachedFrames[cachedIndex]);
                    REPORTER_ASSERT(r, success);
                }
                SkCodec::Options opts;
                opts.fFrameIndex = index;
                opts.fPriorFrame = cachedIndex;
                const auto result = codec->getPixels(decodeInfo, bm->getPixels(), bm->rowBytes(),
                                                     &opts);
                if (cachedIndex != SkCodec::kNone && restore_previous(frameInfos[cachedIndex])) {
                    if (result == SkCodec::kInvalidParameters) {
                        return true;
                    }
                    ERRORF(r, "Using a kRestorePrevious frame as fPriorFrame should fail");
                    return false;
                }
                if (result != SkCodec::kSuccess) {
                    ERRORF(r, "Failed to decode frame %i from %s when providing prior frame %i, "
                              "error %i", index, rec.fName, cachedIndex, result);
                }
                return result == SkCodec::kSuccess;
            };

            for (int i = 0; i < frameCount; i++) {
                SkBitmap& cachedFrame = cachedFrames[i];
                if (!decode(&cachedFrame, i, SkCodec::kNone)) {
                    continue;
                }
                const auto reqFrame = frameInfos[i].fRequiredFrame;
                if (reqFrame == SkCodec::kNone) {
                    // Nothing to compare against.
                    continue;
                }
                for (int j = reqFrame; j < i; j++) {
                    SkBitmap frame;
                    if (restore_previous(frameInfos[j])) {
                        (void) decode(&frame, i, j);
                        continue;
                    }
                    if (!decode(&frame, i, j)) {
                        continue;
                    }

                    // Now verify they're equal.
                    const size_t rowLen = info.bytesPerPixel() * info.width();
                    for (int y = 0; y < info.height(); y++) {
                        const void* cachedAddr = cachedFrame.getAddr(0, y);
                        SkASSERT(cachedAddr != nullptr);
                        const void* addr = frame.getAddr(0, y);
                        SkASSERT(addr != nullptr);
                        const bool lineMatches = memcmp(cachedAddr, addr, rowLen) == 0;
                        if (!lineMatches) {
                            SkString name = SkStringPrintf("cached_%i", i);
                            write_bm(name.c_str(), cachedFrame);
                            name = SkStringPrintf("frame_%i", i);
                            write_bm(name.c_str(), frame);
                            ERRORF(r, "%s's frame %i is different (starting from line %i) when "
                                      "providing prior frame %i!", rec.fName, i, y, j);
                            break;
                        }
                    }
                }
            }
        }
    }
}
static sk_sp<SkImage> make_codec_image() {
    sk_sp<SkData> encoded = GetResourceAsData("images/randPixels.png");
    return SkImage::MakeFromEncoded(encoded);
}