C++ SkImageInfo::colorSpace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;
    }
}

bool SkSurface_Gpu::Valid(const SkImageInfo& info) {
    switch (info.colorType()) {
        case kRGBA_F16_SkColorType:
            return (!info.colorSpace()) || info.colorSpace()->gammaIsLinear();
        case kRGBA_8888_SkColorType:
        case kBGRA_8888_SkColorType:
            return !info.colorSpace() || info.colorSpace()->gammaCloseToSRGB();
        default:
            return !info.colorSpace();
    }
}

bool SkPngEncoderMgr::setColorSpace(const SkImageInfo& info) {
    if (setjmp(png_jmpbuf(fPngPtr))) {
        return false;
    }

    if (info.colorSpace() && info.colorSpace()->isSRGB()) {
        png_set_sRGB(fPngPtr, fInfoPtr, PNG_sRGB_INTENT_PERCEPTUAL);
    } else {
        set_icc(fPngPtr, fInfoPtr, info);
    }

    return true;
}

DEF_TEST(ColorSpace_Named, r) {
    const struct {
        SkColorSpace::Named fNamed;
        bool fExpectedToSucceed;
        bool fIsSRGB;
    } recs[] {
        { SkColorSpace::kUnknown_Named,  false, false },
        { SkColorSpace::kSRGB_Named,     true,  true },
        { SkColorSpace::kAdobeRGB_Named, true,  false },
    };

    for (auto rec : recs) {
        auto cs = SkColorSpace::NewNamed(rec.fNamed);
        REPORTER_ASSERT(r, !cs == !rec.fExpectedToSucceed);
        if (cs) {
            if (rec.fIsSRGB) {
                REPORTER_ASSERT(r, SkColorSpace::kSRGB_GammaNamed == cs->gammaNamed());
            } else {
                REPORTER_ASSERT(r, SkColorSpace::k2Dot2Curve_GammaNamed == cs->gammaNamed());
            }
        }
    }

    SkImageInfo info = SkImageInfo::MakeS32(10, 10, kPremul_SkAlphaType);
    REPORTER_ASSERT(r, kSRGB_SkColorProfileType == info.profileType());
    REPORTER_ASSERT(r, SkColorSpace::kSRGB_GammaNamed == info.colorSpace()->gammaNamed());
}

sk_sp<SkImage> SkSurface_Gpu::onNewImageSnapshot(SkBudgeted budgeted, ForceCopyMode forceCopyMode) {
    GrRenderTarget* rt = fDevice->accessDrawContext()->accessRenderTarget();
    SkASSERT(rt);
    GrTexture* tex = rt->asTexture();
    SkAutoTUnref<GrTexture> copy;
    // If the original render target is a buffer originally created by the client, then we don't
    // want to ever retarget the SkSurface at another buffer we create. Force a copy now to avoid
    // copy-on-write.
    if (kYes_ForceCopyMode == forceCopyMode || !tex || rt->resourcePriv().refsWrappedObjects()) {
        GrSurfaceDesc desc = fDevice->accessDrawContext()->desc();
        GrContext* ctx = fDevice->context();
        desc.fFlags = desc.fFlags & ~kRenderTarget_GrSurfaceFlag;
        copy.reset(ctx->textureProvider()->createTexture(desc, budgeted));
        if (!copy) {
            return nullptr;
        }
        if (!ctx->copySurface(copy, rt)) {
            return nullptr;
        }
        tex = copy;
    }
    const SkImageInfo info = fDevice->imageInfo();
    sk_sp<SkImage> image;
    if (tex) {
        image = sk_make_sp<SkImage_Gpu>(info.width(), info.height(), kNeedNewImageUniqueID,
                                        info.alphaType(), tex, sk_ref_sp(info.colorSpace()),
                                        budgeted);
    }
    return image;
}

sk_sp<SkImage> SkImage::MakeFromBitmap(const SkBitmap& bm) {
    SkPixelRef* pr = bm.pixelRef();
    if (nullptr == pr) {
        return nullptr;
    }

#if SK_SUPPORT_GPU
    if (GrTexture* tex = pr->getTexture()) {
        SkAutoTUnref<GrTexture> unrefCopy;
        if (!bm.isImmutable()) {
            tex = GrDeepCopyTexture(tex, SkBudgeted::kNo);
            if (nullptr == tex) {
                return nullptr;
            }
            unrefCopy.reset(tex);
        }
        const SkImageInfo info = bm.info();
        return sk_make_sp<SkImage_Gpu>(info.width(), info.height(), bm.getGenerationID(),
                                       info.alphaType(), tex, sk_ref_sp(info.colorSpace()),
                                       SkBudgeted::kNo);
    }
#endif

    // This will check for immutable (share or copy)
    return SkMakeImageFromRasterBitmap(bm);
}

bool SkImage_Lazy::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
                                int srcX, int srcY, CachingHint chint) const {
    SkColorSpace* dstColorSpace = dstInfo.colorSpace();
    SkBitmap bm;
    if (kDisallow_CachingHint == chint) {
        CachedFormat cacheFormat = this->chooseCacheFormat(dstColorSpace);
        SkImageInfo genPixelsInfo = dstInfo;
        SkTransferFunctionBehavior behavior = getGeneratorBehaviorAndInfo(&genPixelsInfo);
        if (this->lockAsBitmapOnlyIfAlreadyCached(&bm, cacheFormat)) {
            return bm.readPixels(dstInfo, dstPixels, dstRB, srcX, srcY);
        } else {
            // Try passing the caller's buffer directly down to the generator. If this fails we
            // may still succeed in the general case, as the generator may prefer some other
            // config, which we could then convert via SkBitmap::readPixels.
            if (this->directGeneratePixels(genPixelsInfo, dstPixels, dstRB, srcX, srcY, behavior)) {
                return true;
            }
            // else fall through
        }
    }

    if (this->getROPixels(&bm, dstColorSpace, chint)) {
        return bm.readPixels(dstInfo, dstPixels, dstRB, srcX, srcY);
    }
    return false;
}

SkSurfaceCharacterization GrContextThreadSafeProxy::createCharacterization(
                                     size_t cacheMaxResourceBytes,
                                     const SkImageInfo& ii, const GrBackendFormat& backendFormat,
                                     int sampleCnt, GrSurfaceOrigin origin,
                                     const SkSurfaceProps& surfaceProps,
                                     bool isMipMapped, bool willUseGLFBO0, bool isTextureable) {
    if (!backendFormat.isValid()) {
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    if (GrBackendApi::kOpenGL != backendFormat.backend() && willUseGLFBO0) {
        // The willUseGLFBO0 flags can only be used for a GL backend.
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    if (!this->caps()->mipMapSupport()) {
        isMipMapped = false;
    }

    GrPixelConfig config = this->caps()->getConfigFromBackendFormat(backendFormat, ii.colorType());
    if (config == kUnknown_GrPixelConfig) {
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    if (!SkSurface_Gpu::Valid(this->caps(), config, ii.colorSpace())) {
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    sampleCnt = this->caps()->getRenderTargetSampleCount(sampleCnt, config);
    if (!sampleCnt) {
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    GrFSAAType FSAAType = GrFSAAType::kNone;
    if (sampleCnt > 1) {
        FSAAType = this->caps()->usesMixedSamples() ? GrFSAAType::kMixedSamples
                                                    : GrFSAAType::kUnifiedMSAA;
    }

    if (willUseGLFBO0 && isTextureable) {
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    if (isTextureable && !this->caps()->isConfigTexturable(config)) {
        // Skia doesn't agree that this is textureable.
        return SkSurfaceCharacterization(); // return an invalid characterization
    }

    return SkSurfaceCharacterization(sk_ref_sp<GrContextThreadSafeProxy>(this),
                                     cacheMaxResourceBytes, ii,
                                     origin, config, FSAAType, sampleCnt,
                                     SkSurfaceCharacterization::Textureable(isTextureable),
                                     SkSurfaceCharacterization::MipMapped(isMipMapped),
                                     SkSurfaceCharacterization::UsesGLFBO0(willUseGLFBO0),
                                     SkSurfaceCharacterization::VulkanSecondaryCBCompatible(false),
                                     surfaceProps);
}

bool SkJpegCodec::initializeColorXform(const SkImageInfo& dstInfo, bool needsColorXform) {
    if (needsColorXform) {
        fColorXform = SkColorSpaceXform::New(sk_ref_sp(this->getInfo().colorSpace()),
                                             sk_ref_sp(dstInfo.colorSpace()));
        if (!fColorXform && kRGBA_F16_SkColorType == dstInfo.colorType()) {
            return false;
        }
    }

    return true;
}

    sk_sp<SkSpecialSurface> onMakeSurface(const SkImageInfo& info) const override {
        if (!fTexture->getContext()) {
            return nullptr;
        }

        GrPixelConfig config = SkImageInfo2GrPixelConfig(info, *fTexture->getContext()->caps());

        return SkSpecialSurface::MakeRenderTarget(fTexture->getContext(),
                info.width(), info.height(),
                config, sk_ref_sp(info.colorSpace()));
    }

bool SkPngCodec::initializeXforms(const SkImageInfo& dstInfo, const Options& options,
                                  SkPMColor ctable[], int* ctableCount) {
    if (setjmp(png_jmpbuf(fPng_ptr))) {
        SkCodecPrintf("Failed on png_read_update_info.\n");
        return false;
    }
    png_read_update_info(fPng_ptr, fInfo_ptr);

    // It's important to reset fColorXform to nullptr.  We don't do this on rewinding
    // because the interlaced scanline decoder may need to rewind.
    fColorXform = nullptr;
    SkImageInfo swizzlerInfo = dstInfo;
    bool needsColorXform = needs_color_xform(dstInfo, this->getInfo());
    if (needsColorXform) {
        switch (dstInfo.colorType()) {
            case kRGBA_8888_SkColorType:
            case kBGRA_8888_SkColorType:
            case kRGBA_F16_SkColorType:
                swizzlerInfo = swizzlerInfo.makeColorType(kRGBA_8888_SkColorType);
                if (kPremul_SkAlphaType == dstInfo.alphaType()) {
                    swizzlerInfo = swizzlerInfo.makeAlphaType(kUnpremul_SkAlphaType);
                }
                break;
            case kIndex_8_SkColorType:
                break;
            default:
                return false;
        }

        fColorXform = SkColorSpaceXform::New(sk_ref_sp(this->getInfo().colorSpace()),
                                             sk_ref_sp(dstInfo.colorSpace()));

        if (!fColorXform && kRGBA_F16_SkColorType == dstInfo.colorType()) {
            return false;
        }
    }

    if (SkEncodedInfo::kPalette_Color == this->getEncodedInfo().color()) {
        if (!this->createColorTable(dstInfo, ctableCount)) {
            return false;
        }
    }

    // Copy the color table to the client if they request kIndex8 mode
    copy_color_table(swizzlerInfo, fColorTable, ctable, ctableCount);

    // Create the swizzler.  SkPngCodec retains ownership of the color table.
    const SkPMColor* colors = get_color_ptr(fColorTable.get());
    fSwizzler.reset(SkSwizzler::CreateSwizzler(this->getEncodedInfo(), colors, swizzlerInfo,
                                               options));
    SkASSERT(fSwizzler);
    return true;
}

sk_sp<SkImage> SkImage::MakeTextureFromMipMap(GrContext* ctx, const SkImageInfo& info,
                                              const GrMipLevel* texels, int mipLevelCount,
                                              SkBudgeted budgeted,
                                              SkSourceGammaTreatment gammaTreatment) {
    if (!ctx) {
        return nullptr;
    }
    sk_sp<GrTexture> texture(GrUploadMipMapToTexture(ctx, info, texels, mipLevelCount));
    if (!texture) {
        return nullptr;
    }
    texture->texturePriv().setGammaTreatment(gammaTreatment);
    return sk_make_sp<SkImage_Gpu>(texture->width(), texture->height(), kNeedNewImageUniqueID,
                                   info.alphaType(), std::move(texture),
                                   sk_ref_sp(info.colorSpace()), budgeted);
}

/*
 * Checks if the conversion between the input image and the requested output
 * image has been implemented
 * Sets the output color format
 */
bool SkHeifCodec::setOutputColorFormat(const SkImageInfo& dstInfo) {
    if (kUnknown_SkAlphaType == dstInfo.alphaType()) {
        return false;
    }

    if (kOpaque_SkAlphaType != dstInfo.alphaType()) {
        SkCodecPrintf("Warning: an opaque image should be decoded as opaque "
                "- it is being decoded as non-opaque, which will draw slower\n");
    }

    switch (dstInfo.colorType()) {
        case kRGBA_8888_SkColorType:
            return fHeifDecoder->setOutputColor(kHeifColorFormat_RGBA_8888);

        case kBGRA_8888_SkColorType:
            return fHeifDecoder->setOutputColor(kHeifColorFormat_BGRA_8888);

        case kRGB_565_SkColorType:
            if (this->colorXform()) {
                return fHeifDecoder->setOutputColor(kHeifColorFormat_RGBA_8888);
            } else {
                return fHeifDecoder->setOutputColor(kHeifColorFormat_RGB565);
            }

        case kRGBA_F16_SkColorType:
            SkASSERT(this->colorXform());

            if (!dstInfo.colorSpace()->gammaIsLinear()) {
                return false;
            }
            return fHeifDecoder->setOutputColor(kHeifColorFormat_RGBA_8888);

        default:
            return false;
    }
}

/*
 *  We have 4 ways to try to return a texture (in sorted order)
 *
 *  1. Check the cache for a pre-existing one
 *  2. Ask the generator to natively create one
 *  3. Ask the generator to return YUV planes, which the GPU can convert
 *  4. Ask the generator to return RGB(A) data, which the GPU can convert
 */
sk_sp<GrTextureProxy> SkImage_Lazy::lockTextureProxy(GrContext* ctx,
                                                     const GrUniqueKey& origKey,
                                                     SkImage::CachingHint chint,
                                                     bool willBeMipped,
                                                     SkColorSpace* dstColorSpace,
                                                     GrTextureMaker::AllowedTexGenType genType) {
    // Values representing the various texture lock paths we can take. Used for logging the path
    // taken to a histogram.
    enum LockTexturePath {
        kFailure_LockTexturePath,
        kPreExisting_LockTexturePath,
        kNative_LockTexturePath,
        kCompressed_LockTexturePath, // Deprecated
        kYUV_LockTexturePath,
        kRGBA_LockTexturePath,
    };

    enum { kLockTexturePathCount = kRGBA_LockTexturePath + 1 };

    // Determine which cached format we're going to use (which may involve decoding to a different
    // info than the generator provides).
    CachedFormat format = this->chooseCacheFormat(dstColorSpace, ctx->caps());

    // Fold the cache format into our texture key
    GrUniqueKey key;
    this->makeCacheKeyFromOrigKey(origKey, format, &key);

    GrProxyProvider* proxyProvider = ctx->contextPriv().proxyProvider();
    sk_sp<GrTextureProxy> proxy;

    // 1. Check the cache for a pre-existing one
    if (key.isValid()) {
        proxy = proxyProvider->findOrCreateProxyByUniqueKey(key, kTopLeft_GrSurfaceOrigin);
        if (proxy) {
            SK_HISTOGRAM_ENUMERATION("LockTexturePath", kPreExisting_LockTexturePath,
                                     kLockTexturePathCount);
            if (!willBeMipped || GrMipMapped::kYes == proxy->mipMapped()) {
                return proxy;
            }
        }
    }

    // The CachedFormat is both an index for which cache "slot" we'll use to store this particular
    // decoded variant of the encoded data, and also a recipe for how to transform the original
    // info to get the one that we're going to decode to.
    const SkImageInfo cacheInfo = this->buildCacheInfo(format);
    SkImageInfo genPixelsInfo = cacheInfo;
    SkTransferFunctionBehavior behavior = getGeneratorBehaviorAndInfo(&genPixelsInfo);

    // 2. Ask the generator to natively create one
    if (!proxy) {
        ScopedGenerator generator(fSharedGenerator);
        if (GrTextureMaker::AllowedTexGenType::kCheap == genType &&
                SkImageGenerator::TexGenType::kCheap != generator->onCanGenerateTexture()) {
            return nullptr;
        }
        if ((proxy = generator->generateTexture(ctx, genPixelsInfo, fOrigin, behavior,
                                                willBeMipped))) {
            SK_HISTOGRAM_ENUMERATION("LockTexturePath", kNative_LockTexturePath,
                                     kLockTexturePathCount);
            set_key_on_proxy(proxyProvider, proxy.get(), nullptr, key);
            if (!willBeMipped || GrMipMapped::kYes == proxy->mipMapped()) {
                return proxy;
            }
        }
    }

    // 3. Ask the generator to return YUV planes, which the GPU can convert. If we will be mipping
    //    the texture we fall through here and have the CPU generate the mip maps for us.
    if (!proxy && !willBeMipped && !ctx->contextPriv().disableGpuYUVConversion()) {
        const GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(cacheInfo, *ctx->caps());
        ScopedGenerator generator(fSharedGenerator);
        Generator_GrYUVProvider provider(generator);

        // The pixels in the texture will be in the generator's color space. If onMakeColorSpace
        // has been called then this will not match this image's color space. To correct this, apply
        // a color space conversion from the generator's color space to this image's color space.
        const SkColorSpace* generatorColorSpace =
                fSharedGenerator->fGenerator->getInfo().colorSpace();
        const SkColorSpace* thisColorSpace = fInfo.colorSpace();

        // TODO: Update to create the mipped surface in the YUV generator and draw the base layer
        // directly into the mipped surface.
        proxy = provider.refAsTextureProxy(ctx, desc, generatorColorSpace, thisColorSpace);
        if (proxy) {
            SK_HISTOGRAM_ENUMERATION("LockTexturePath", kYUV_LockTexturePath,
                                     kLockTexturePathCount);
            set_key_on_proxy(proxyProvider, proxy.get(), nullptr, key);
            return proxy;
        }
    }

//.........这里部分代码省略.........

GrPixelConfig SkImageInfo2GrPixelConfig(const SkImageInfo& info, const GrCaps& caps) {
    return SkImageInfo2GrPixelConfig(info.colorType(), info.colorSpace(), caps);
}