C++ SkImageInfo::makeColorSpace方法代码示例

SkImageInfo SkImage_Lazy::buildCacheInfo(CachedFormat format) const {
    switch (format) {
        case kLegacy_CachedFormat:
            return fInfo.makeColorSpace(nullptr);
        case kLinearF16_CachedFormat:
            return fInfo.makeColorType(kRGBA_F16_SkColorType)
                        .makeColorSpace(fInfo.colorSpace()->makeLinearGamma());
        case kSRGB8888_CachedFormat:
            // If the transfer function is nearly (but not exactly) sRGB, we don't want the codec
            // to bother trans-coding. It would be slow, and do more harm than good visually,
            // so we make sure to leave the colorspace as-is.
            if (fInfo.colorSpace()->gammaCloseToSRGB()) {
                return fInfo.makeColorType(kRGBA_8888_SkColorType);
            } else {
                return fInfo.makeColorType(kRGBA_8888_SkColorType)
                            .makeColorSpace(fInfo.colorSpace()->makeSRGBGamma());
            }
        case kSBGR8888_CachedFormat:
            // See note above about not-quite-sRGB transfer functions.
            if (fInfo.colorSpace()->gammaCloseToSRGB()) {
                return fInfo.makeColorType(kBGRA_8888_SkColorType);
            } else {
                return fInfo.makeColorType(kBGRA_8888_SkColorType)
                            .makeColorSpace(fInfo.colorSpace()->makeSRGBGamma());
            }
        default:
            SkDEBUGFAIL("Invalid cached format");
            return fInfo;
    }
}

static void draw_image(SkCanvas* canvas, SkImage* image, SkColorType dstColorType,
                       SkAlphaType dstAlphaType, sk_sp<SkColorSpace> dstColorSpace,
                       SkImage::CachingHint hint) {
    size_t rowBytes = image->width() * SkColorTypeBytesPerPixel(dstColorType);
    sk_sp<SkData> data = SkData::MakeUninitialized(rowBytes * image->height());
    dstColorSpace = fix_for_colortype(dstColorSpace.get(), dstColorType);
    SkImageInfo dstInfo = SkImageInfo::Make(image->width(), image->height(), dstColorType,
                                            dstAlphaType, dstColorSpace);
    if (!image->readPixels(dstInfo, data->writable_data(), rowBytes, 0, 0, hint)) {
        memset(data->writable_data(), 0, rowBytes * image->height());
    }

    // SkImage must be premul, so manually premul the data if we unpremul'd during readPixels
    if (kUnpremul_SkAlphaType == dstAlphaType) {
        auto xform = SkColorSpaceXform::New(dstColorSpace.get(), dstColorSpace.get());
        if (!xform->apply(select_xform_format(dstColorType), data->writable_data(),
                          select_xform_format(dstColorType), data->data(),
                          image->width() * image->height(), kPremul_SkAlphaType)) {
            memset(data->writable_data(), 0, rowBytes * image->height());
        }
        dstInfo = dstInfo.makeAlphaType(kPremul_SkAlphaType);
    }

    // readPixels() does not always clamp F16.  The drawing code expects pixels in the 0-1 range.
    clamp_if_necessary(dstInfo, data->writable_data());

    // Now that we have called readPixels(), dump the raw pixels into an srgb image.
    sk_sp<SkColorSpace> srgb = fix_for_colortype(
            SkColorSpace::MakeSRGB().get(), dstColorType);
    sk_sp<SkImage> raw = SkImage::MakeRasterData(dstInfo.makeColorSpace(srgb), data, rowBytes);
    canvas->drawImage(raw.get(), 0.0f, 0.0f, nullptr);
}

sk_sp<SkImage> SkImageMakeRasterCopyAndAssignColorSpace(const SkImage* src,
                                                        SkColorSpace* colorSpace) {
    // Read the pixels out of the source image, with no conversion
    SkImageInfo info = as_IB(src)->onImageInfo();
    if (kUnknown_SkColorType == info.colorType()) {
        SkDEBUGFAIL("Unexpected color type");
        return nullptr;
    }

    size_t rowBytes = info.minRowBytes();
    size_t size = info.computeByteSize(rowBytes);
    if (SkImageInfo::ByteSizeOverflowed(size)) {
        return nullptr;
    }
    auto data = SkData::MakeUninitialized(size);
    if (!data) {
        return nullptr;
    }

    SkPixmap pm(info, data->writable_data(), rowBytes);
    if (!src->readPixels(pm, 0, 0, SkImage::kDisallow_CachingHint)) {
        return nullptr;
    }

    // Wrap them in a new image with a different color space
    return SkImage::MakeRasterData(info.makeColorSpace(sk_ref_sp(colorSpace)), data, rowBytes);
}

    static std::unique_ptr<Dst> Create(Options options) {
        SkImageInfo info = SkImageInfo::MakeN32Premul(0,0);
        if (options("ct") == "565") { info = info.makeColorType(kRGB_565_SkColorType); }
        if (options("ct") == "f16") { info = info.makeColorType(kRGBA_F16_SkColorType); }

        if (options("cs") == "srgb") {
            auto cs = info.colorType() == kRGBA_F16_SkColorType ? SkColorSpace::MakeSRGBLinear()
                                                                : SkColorSpace::MakeSRGB();
            info = info.makeColorSpace(std::move(cs));
        }

        SWDst dst;
        dst.info = info;
        return move_unique(dst);
    }

static void test_flatten(skiatest::Reporter* reporter, const SkImageInfo& info) {
    // just need a safe amount of storage, but ensure that it is 4-byte aligned.
    int32_t storage[(sizeof(SkImageInfo)*2) / sizeof(int32_t)];
    SkBinaryWriteBuffer wb(storage, sizeof(storage));
    info.flatten(wb);
    SkASSERT(wb.bytesWritten() < sizeof(storage));

    SkReadBuffer rb(storage, wb.bytesWritten());

    // pick a noisy byte pattern, so we ensure that unflatten sets all of our fields
    SkImageInfo info2 = SkImageInfo::Make(0xB8, 0xB8, (SkColorType) 0xB8, (SkAlphaType) 0xB8,
                                          (SkColorProfileType) 0xB8);

    info2.unflatten(rb);
    REPORTER_ASSERT(reporter, rb.offset() == wb.bytesWritten());

    // FIXME (msarett):
    // Support flatten/unflatten of SkColorSpace objects.
    REPORTER_ASSERT(reporter, info.makeColorSpace(nullptr) == info2.makeColorSpace(nullptr));
}

sk_sp<SkImage> SkImage::makeRasterImage() const {
    SkPixmap pm;
    if (this->peekPixels(&pm)) {
        return sk_ref_sp(const_cast<SkImage*>(this));
    }

    const SkImageInfo info = as_IB(this)->onImageInfo();
    const size_t rowBytes = info.minRowBytes();
    size_t size = info.computeByteSize(rowBytes);
    if (SkImageInfo::ByteSizeOverflowed(size)) {
        return nullptr;
    }

    sk_sp<SkData> data = SkData::MakeUninitialized(size);
    pm = { info.makeColorSpace(nullptr), data->writable_data(), info.minRowBytes() };
    if (!this->readPixels(pm, 0, 0)) {
        return nullptr;
    }

    return SkImage::MakeRasterData(info, std::move(data), rowBytes);
}