C++ SkAutoTUnref::reset方法代码示例

static bool render_page(const SkString& outputDir,
                        const SkString& inputFilename,
                        const SkPdfRenderer& renderer,
                        int page) {
    SkRect rect = renderer.MediaBox(page < 0 ? 0 :page);

    // Exercise all pdf codepaths as in normal rendering, but no actual bits are changed.
    if (!FLAGS_config.isEmpty() && strcmp(FLAGS_config[0], "nul") == 0) {
        SkBitmap bitmap;
        SkAutoTUnref<SkBaseDevice> device(SkNEW_ARGS(SkBitmapDevice, (bitmap)));
        SkNulCanvas canvas(device);
        renderer.renderPage(page < 0 ? 0 : page, &canvas, rect);
    } else {
        // 8888
        SkRect rect = renderer.MediaBox(page < 0 ? 0 :page);

        SkBitmap bitmap;
        SkScalar width = SkScalarMul(rect.width(),  SkDoubleToScalar(FLAGS_DPI / 72.0));
        SkScalar height = SkScalarMul(rect.height(),  SkDoubleToScalar(FLAGS_DPI / 72.0));

        rect = SkRect::MakeWH(width, height);

        SkColor background = FLAGS_transparentBackground ? SK_ColorTRANSPARENT : SK_ColorWHITE;

#ifdef PDF_DEBUG_3X
        setup_bitmap(&bitmap, 3 * (int)SkScalarToDouble(width), 3 * (int)SkScalarToDouble(height),
                     background);
#else
        setup_bitmap(&bitmap, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height),
                     background);
#endif
        SkAutoTUnref<SkBaseDevice> device;
        if (strcmp(FLAGS_config[0], "8888") == 0) {
            device.reset(SkNEW_ARGS(SkBitmapDevice, (bitmap)));
        }
#if SK_SUPPORT_GPU
        else if (strcmp(FLAGS_config[0], "gpu") == 0) {
            SkAutoTUnref<GrSurface> target;
            GrContext* gr = gContextFactory.get(GrContextFactory::kNative_GLContextType);
            if (gr) {
                // create a render target to back the device
                GrTextureDesc desc;
                desc.fConfig = kSkia8888_GrPixelConfig;
                desc.fFlags = kRenderTarget_GrTextureFlagBit;
                desc.fWidth = SkScalarCeilToInt(width);
                desc.fHeight = SkScalarCeilToInt(height);
                desc.fSampleCnt = 0;
                target.reset(gr->createUncachedTexture(desc, NULL, 0));
            }
            if (NULL == target.get()) {
                SkASSERT(0);
                return false;
            }

            device.reset(SkGpuDevice::Create(target));
        }
#endif
        else {
            SkDebugf("unknown --config: %s\n", FLAGS_config[0]);
            return false;
        }
        SkCanvas canvas(device);

#ifdef PDF_TRACE_DIFF_IN_PNG
        gDumpBitmap = &bitmap;
        gDumpCanvas = &canvas;
#endif
        renderer.renderPage(page < 0 ? 0 : page, &canvas, rect);

        SkString outputPath;
        if (!make_output_filepath(&outputPath, outputDir, inputFilename, page)) {
            return false;
        }
        SkImageEncoder::EncodeFile(outputPath.c_str(), bitmap, SkImageEncoder::kPNG_Type, 100);

        if (FLAGS_showMemoryUsage) {
            SkDebugf("Memory usage after page %i rendered: %u\n",
                     page < 0 ? 0 : page, (unsigned int)renderer.bytesUsed());
        }
    }
    return true;
}

SkOSWindow* create_sk_window(void* hwnd, int argc, char** argv) {
    printf("Started\n");

    v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
    SkCommandLineFlags::Parse(argc, argv);

    v8::V8::InitializeICU();
    v8::Platform* platform = v8::platform::CreateDefaultPlatform();
    v8::V8::InitializePlatform(platform);
    v8::V8::Initialize();

    v8::Isolate* isolate = v8::Isolate::New();
    v8::Isolate::Scope isolate_scope(isolate);
    v8::HandleScope handle_scope(isolate);
    isolate->Enter();

    global = new Global(isolate);


    // Set up things to look like a browser by creating
    // a console object that invokes our print function.
    const char* startupScript =
            "function Console() {};                   \n"
            "Console.prototype.log = function() {     \n"
            "  var args = Array.prototype.slice.call(arguments).join(' '); \n"
            "  print(args);                      \n"
            "};                                       \n"
            "console = new Console();                 \n";

    if (!global->parseScript(startupScript)) {
        printf("Failed to parse startup script: %s.\n", FLAGS_infile[0]);
        exit(1);
    }

    const char* script =
            "function onDraw(canvas) {              \n"
            "    canvas.fillStyle = '#00FF00';      \n"
            "    canvas.fillRect(20, 20, 100, 100); \n"
            "    canvas.inval();                    \n"
            "}                                      \n";

    SkAutoTUnref<SkData> data;
    if (FLAGS_infile.count()) {
        data.reset(SkData::NewFromFileName(FLAGS_infile[0]));
        script = static_cast<const char*>(data->data());
    }
    if (NULL == script) {
        printf("Could not load file: %s.\n", FLAGS_infile[0]);
        exit(1);
    }
    Path2DBuilder::AddToGlobal(global);
    Path2D::AddToGlobal(global);

    if (!global->parseScript(script)) {
        printf("Failed to parse file: %s.\n", FLAGS_infile[0]);
        exit(1);
    }


    JsContext* jsContext = new JsContext(global);

    if (!jsContext->initialize()) {
        printf("Failed to initialize.\n");
        exit(1);
    }
    SkV8ExampleWindow* win = new SkV8ExampleWindow(hwnd, jsContext);
    global->setWindow(win);

    return win;
}

const GrGLInterface* GrGLCreateNullInterface() {
    // The gl functions are not context-specific so we create one global
    // interface
    static SkAutoTUnref<GrGLInterface> glInterface;
    if (!glInterface.get()) {
        GrGLInterface* interface = SkNEW(GrGLInterface);
        glInterface.reset(interface);
        interface->fBindingsExported = kDesktop_GrGLBinding;
        interface->fActiveTexture = nullGLActiveTexture;
        interface->fAttachShader = nullGLAttachShader;
        interface->fBeginQuery = nullGLBeginQuery;
        interface->fBindAttribLocation = nullGLBindAttribLocation;
        interface->fBindBuffer = nullGLBindBuffer;
        interface->fBindFragDataLocation = nullGLBindFragDataLocation;
        interface->fBindTexture = nullGLBindTexture;
        interface->fBlendColor = nullGLBlendColor;
        interface->fBlendFunc = nullGLBlendFunc;
        interface->fBufferData = nullGLBufferData;
        interface->fBufferSubData = nullGLBufferSubData;
        interface->fClear = nullGLClear;
        interface->fClearColor = nullGLClearColor;
        interface->fClearStencil = nullGLClearStencil;
        interface->fColorMask = nullGLColorMask;
        interface->fCompileShader = nullGLCompileShader;
        interface->fCompressedTexImage2D = nullGLCompressedTexImage2D;
        interface->fCreateProgram = nullGLCreateProgram;
        interface->fCreateShader = nullGLCreateShader;
        interface->fCullFace = nullGLCullFace;
        interface->fDeleteBuffers = nullGLDeleteBuffers;
        interface->fDeleteProgram = nullGLDelete;
        interface->fDeleteQueries = nullGLDeleteIds;
        interface->fDeleteShader = nullGLDelete;
        interface->fDeleteTextures = nullGLDeleteIds;
        interface->fDepthMask = nullGLDepthMask;
        interface->fDisable = nullGLDisable;
        interface->fDisableVertexAttribArray = nullGLDisableVertexAttribArray;
        interface->fDrawArrays = nullGLDrawArrays;
        interface->fDrawBuffer = nullGLDrawBuffer;
        interface->fDrawBuffers = nullGLDrawBuffers;
        interface->fDrawElements = nullGLDrawElements;
        interface->fEnable = nullGLEnable;
        interface->fEnableVertexAttribArray = nullGLEnableVertexAttribArray;
        interface->fEndQuery = nullGLEndQuery;
        interface->fFinish = nullGLFinish;
        interface->fFlush = nullGLFlush;
        interface->fFrontFace = nullGLFrontFace;
        interface->fGenBuffers = nullGLGenIds;
        interface->fGenQueries = nullGLGenIds;
        interface->fGenTextures = nullGLGenIds;
        interface->fGetBufferParameteriv = nullGLGetBufferParameteriv;
        interface->fGetError = nullGLGetError;
        interface->fGetIntegerv = nullGLGetIntegerv;
        interface->fGetQueryObjecti64v = nullGLGetQueryObjecti64v;
        interface->fGetQueryObjectiv = nullGLGetQueryObjectiv;
        interface->fGetQueryObjectui64v = nullGLGetQueryObjectui64v;
        interface->fGetQueryObjectuiv = nullGLGetQueryObjectuiv;
        interface->fGetQueryiv = nullGLGetQueryiv;
        interface->fGetProgramInfoLog = nullGLGetInfoLog;
        interface->fGetProgramiv = nullGLGetShaderOrProgramiv;
        interface->fGetShaderInfoLog = nullGLGetInfoLog;
        interface->fGetShaderiv = nullGLGetShaderOrProgramiv;
        interface->fGetString = nullGLGetString;
        interface->fGetTexLevelParameteriv = nullGLGetTexLevelParameteriv;
        interface->fGetUniformLocation = nullGLGetUniformLocation;
        interface->fLineWidth = nullGLLineWidth;
        interface->fLinkProgram = nullGLLinkProgram;
        interface->fPixelStorei = nullGLPixelStorei;
        interface->fQueryCounter = nullGLQueryCounter;
        interface->fReadBuffer = nullGLReadBuffer;
        interface->fReadPixels = nullGLReadPixels;
        interface->fScissor = nullGLScissor;
        interface->fShaderSource = nullGLShaderSource;
        interface->fStencilFunc = nullGLStencilFunc;
        interface->fStencilFuncSeparate = nullGLStencilFuncSeparate;
        interface->fStencilMask = nullGLStencilMask;
        interface->fStencilMaskSeparate = nullGLStencilMaskSeparate;
        interface->fStencilOp = nullGLStencilOp;
        interface->fStencilOpSeparate = nullGLStencilOpSeparate;
        interface->fTexImage2D = nullGLTexImage2D;
        interface->fTexParameteri = nullGLTexParameteri;
        interface->fTexParameteriv = nullGLTexParameteriv;
        interface->fTexSubImage2D = nullGLTexSubImage2D;
        interface->fTexStorage2D = nullGLTexStorage2D;
        interface->fUniform1f = nullGLUniform1f;
        interface->fUniform1i = nullGLUniform1i;
        interface->fUniform1fv = nullGLUniform1fv;
        interface->fUniform1iv = nullGLUniform1iv;
        interface->fUniform2f = nullGLUniform2f;
        interface->fUniform2i = nullGLUniform2i;
        interface->fUniform2fv = nullGLUniform2fv;
        interface->fUniform2iv = nullGLUniform2iv;
        interface->fUniform3f = nullGLUniform3f;
        interface->fUniform3i = nullGLUniform3i;
        interface->fUniform3fv = nullGLUniform3fv;
        interface->fUniform3iv = nullGLUniform3iv;
        interface->fUniform4f = nullGLUniform4f;
        interface->fUniform4i = nullGLUniform4i;
        interface->fUniform4fv = nullGLUniform4fv;
        interface->fUniform4iv = nullGLUniform4iv;
        interface->fUniformMatrix2fv = nullGLUniformMatrix2fv;
//.........这里部分代码省略.........

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& dstBounds,
                        const SkRect* srcBounds,
                        float sigmaX,
                        float sigmaY,
                        GrTextureProvider::SizeConstraint constraint) {
    SkASSERT(context);
    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    int maxTextureSize = context->caps()->maxTextureSize();
    sigmaX = adjust_sigma(sigmaX, maxTextureSize, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, maxTextureSize, &scaleFactorY, &radiusY);

    SkPoint srcOffset = SkPoint::Make(-dstBounds.x(), -dstBounds.y());
    SkRect localDstBounds = SkRect::MakeWH(dstBounds.width(), dstBounds.height());
    SkRect localSrcBounds;
    SkRect srcRect;
    if (srcBounds) {
        srcRect = localSrcBounds = *srcBounds;
        srcRect.offset(srcOffset);
        srcBounds = &localSrcBounds;
    } else {
        srcRect = localDstBounds;
    }

    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut(&srcRect);
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    // setup new clip
    GrClip clip(localDstBounds);

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = SkScalarFloorToInt(dstBounds.width());
    desc.fHeight = SkScalarFloorToInt(dstBounds.height());
    desc.fConfig = srcTexture->config();

    GrTexture* dstTexture;
    GrTexture* tempTexture;
    SkAutoTUnref<GrTexture> temp1, temp2;

    temp1.reset(context->textureProvider()->createTexture(desc, constraint));
    dstTexture = temp1.get();
    if (canClobberSrc) {
        tempTexture = srcTexture;
    } else {
        temp2.reset(context->textureProvider()->createTexture(desc, constraint));
        tempTexture = temp2.get();
    }

    if (nullptr == dstTexture || nullptr == tempTexture) {
        return nullptr;
    }

    SkAutoTUnref<GrDrawContext> srcDrawContext;

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        SkRect dstRect(srcRect);
        if (srcBounds && i == 1) {
            SkRect domain;
            matrix.mapRect(&domain, *srcBounds);
            domain.inset((i < scaleFactorX) ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         (i < scaleFactorY) ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<const GrFragmentProcessor> fp(GrTextureDomainEffect::Create(
                srcTexture,
                matrix,
                domain,
                GrTextureDomain::kDecal_Mode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorFragmentProcessor(fp);
            srcRect.offset(-srcOffset);
            srcOffset.set(0, 0);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureProcessor(srcTexture, matrix, params);
        }
        paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);

        SkAutoTUnref<GrDrawContext> dstDrawContext(
                                             context->drawContext(dstTexture->asRenderTarget()));
        if (!dstDrawContext) {
            return nullptr;
        }
        dstDrawContext->fillRectToRect(clip, paint, SkMatrix::I(), dstRect, srcRect);

        srcDrawContext.swap(dstDrawContext);
//.........这里部分代码省略.........

    void onDraw(SkCanvas* canvas) override{

        SkPaint blackFill;

        //-----------
        // Normal paints (no source)
        SkTArray<SkPaint> paints;
        create_paints(nullptr, &paints);

        //-----------
        // Paints with a PictureImageFilter as a source
        SkAutoTUnref<SkPicture> pic;

        {
            SkPictureRecorder rec;

            SkCanvas* c = rec.beginRecording(10, 10);
            c->drawRect(SkRect::MakeWH(10, 10), blackFill);
            pic.reset(rec.endRecording());
        }

        SkAutoTUnref<SkPictureImageFilter> pif(SkPictureImageFilter::Create(pic));

        SkTArray<SkPaint> pifPaints;
        create_paints(pif, &pifPaints);

        //-----------
        // Paints with a SkImageSource as a source

        SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(10, 10));
        {
            SkPaint p;
            SkCanvas* temp = surface->getCanvas();
            temp->clear(SK_ColorYELLOW);
            p.setColor(SK_ColorBLUE);
            temp->drawRect(SkRect::MakeLTRB(5, 5, 10, 10), p);
            p.setColor(SK_ColorGREEN);
            temp->drawRect(SkRect::MakeLTRB(5, 0, 10, 5), p);
        }

        SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
        SkAutoTUnref<SkImageFilter> imageSource(SkImageSource::Create(image));

        SkTArray<SkPaint> bmsPaints;
        create_paints(imageSource, &bmsPaints);

        //-----------
        SkASSERT(paints.count() == kNumVertTiles);
        SkASSERT(paints.count() == pifPaints.count());
        SkASSERT(paints.count() == bmsPaints.count());

        // horizontal separators
        for (int i = 1; i < paints.count(); ++i) {
            canvas->drawLine(0,
                             i*SkIntToScalar(kTileHeight),
                             SkIntToScalar((SK_ARRAY_COUNT(gDrawMthds) + kNumXtraCols)*kTileWidth),
                             i*SkIntToScalar(kTileHeight),
                             blackFill);
        }
        // vertical separators
        for (int i = 0; i < (int)SK_ARRAY_COUNT(gDrawMthds) + kNumXtraCols; ++i) {
            canvas->drawLine(SkIntToScalar(i * kTileWidth),
                             0,
                             SkIntToScalar(i * kTileWidth), 
                             SkIntToScalar(paints.count() * kTileWidth),
                             blackFill);
        }

        // A column of saveLayers with PictureImageFilters
        for (int i = 0; i < pifPaints.count(); ++i) {
            draw_savelayer_with_paint(SkIPoint::Make(0, i*kTileHeight), 
                                      canvas, pifPaints[i]);
        }

        // A column of saveLayers with BitmapSources
        for (int i = 0; i < pifPaints.count(); ++i) {
            draw_savelayer_with_paint(SkIPoint::Make(kTileWidth, i*kTileHeight),
                                      canvas, bmsPaints[i]);
        }

        // Multiple columns with different geometry
        for (int i = 0; i < (int)SK_ARRAY_COUNT(gDrawMthds); ++i) {
            for (int j = 0; j < paints.count(); ++j) {
                draw_geom_with_paint(*gDrawMthds[i],
                                     SkIPoint::Make((i+kNumXtraCols) * kTileWidth, j*kTileHeight),
                                     canvas, paints[j]);
            }
        }

    }

GrPipeline* GrPipeline::CreateAt(void* memory, const CreateArgs& args,
                                 GrXPOverridesForBatch* overrides) {
    const GrPipelineBuilder& builder = *args.fPipelineBuilder;

    GrPipeline* pipeline = new (memory) GrPipeline;
    pipeline->fRenderTarget.reset(builder.fRenderTarget.get());
    SkASSERT(pipeline->fRenderTarget);
    pipeline->fScissorState = *args.fScissor;
    if (builder.hasUserStencilSettings() || args.fHasStencilClip) {
        const GrRenderTargetPriv& rtPriv = builder.getRenderTarget()->renderTargetPriv();
        pipeline->fStencilSettings.reset(*builder.getUserStencil(), args.fHasStencilClip,
                                         rtPriv.numStencilBits());
        SkASSERT(!pipeline->fStencilSettings.usesWrapOp() || args.fCaps->stencilWrapOpsSupport());
    }
    pipeline->fDrawFace = builder.getDrawFace();

    pipeline->fFlags = 0;
    if (builder.isHWAntialias()) {
        pipeline->fFlags |= kHWAA_Flag;
    }
    if (builder.snapVerticesToPixelCenters()) {
        pipeline->fFlags |= kSnapVertices_Flag;
    }
    if (builder.getDisableOutputConversionToSRGB()) {
        pipeline->fFlags |= kDisableOutputConversionToSRGB_Flag;
    }
    if (builder.getAllowSRGBInputs()) {
        pipeline->fFlags |= kAllowSRGBInputs_Flag;
    }
    if (args.fHasStencilClip) {
        pipeline->fFlags |= kHasStencilClip_Flag;
    }

    // Create XferProcessor from DS's XPFactory
    bool hasMixedSamples = builder.getRenderTarget()->hasMixedSamples() &&
                           (builder.isHWAntialias() || !pipeline->fStencilSettings.isDisabled());
    const GrXPFactory* xpFactory = builder.getXPFactory();
    SkAutoTUnref<GrXferProcessor> xferProcessor;
    if (xpFactory) {
        xferProcessor.reset(xpFactory->createXferProcessor(args.fOpts,
                                                           hasMixedSamples,
                                                           &args.fDstTexture,
                                                           *args.fCaps));
        if (!xferProcessor) {
            pipeline->~GrPipeline();
            return nullptr;
        }
    } else {
        // This may return nullptr in the common case of src-over implemented using hw blending.
        xferProcessor.reset(GrPorterDuffXPFactory::CreateSrcOverXferProcessor(
                                                                        *args.fCaps,
                                                                        args.fOpts,
                                                                        hasMixedSamples,
                                                                        &args.fDstTexture));
    }
    GrColor overrideColor = GrColor_ILLEGAL;
    if (args.fOpts.fColorPOI.firstEffectiveProcessorIndex() != 0) {
        overrideColor = args.fOpts.fColorPOI.inputColorToFirstEffectiveProccesor();
    }

    GrXferProcessor::OptFlags optFlags = GrXferProcessor::kNone_OptFlags;

    const GrXferProcessor* xpForOpts = xferProcessor ? xferProcessor.get() :
                                                       &GrPorterDuffXPFactory::SimpleSrcOverXP();
    optFlags = xpForOpts->getOptimizations(args.fOpts,
                                           pipeline->fStencilSettings.doesWrite(),
                                           &overrideColor,
                                           *args.fCaps);

    // When path rendering the stencil settings are not always set on the GrPipelineBuilder
    // so we must check the draw type. In cases where we will skip drawing we simply return a
    // null GrPipeline.
    if (GrXferProcessor::kSkipDraw_OptFlag & optFlags) {
        pipeline->~GrPipeline();
        return nullptr;
    }

    // No need to have an override color if it isn't even going to be used.
    if (SkToBool(GrXferProcessor::kIgnoreColor_OptFlag & optFlags)) {
        overrideColor = GrColor_ILLEGAL;
    }

    pipeline->fXferProcessor.reset(xferProcessor);

    int firstColorProcessorIdx = args.fOpts.fColorPOI.firstEffectiveProcessorIndex();

    // TODO: Once we can handle single or four channel input into coverage GrFragmentProcessors
    // then we can use GrPipelineBuilder's coverageProcInfo (like color above) to set this initial
    // information.
    int firstCoverageProcessorIdx = 0;

    pipeline->adjustProgramFromOptimizations(builder, optFlags, args.fOpts.fColorPOI,
                                             args.fOpts.fCoveragePOI, &firstColorProcessorIdx,
                                             &firstCoverageProcessorIdx);

    bool usesLocalCoords = false;

    // Copy GrFragmentProcessors from GrPipelineBuilder to Pipeline
    pipeline->fNumColorProcessors = builder.numColorFragmentProcessors() - firstColorProcessorIdx;
    int numTotalProcessors = pipeline->fNumColorProcessors +
//.........这里部分代码省略.........

static GrTexture* load_yuv_texture(GrContext* ctx, const GrUniqueKey& optionalKey,
                                   const SkBitmap& bm, const GrSurfaceDesc& desc) {
    // Subsets are not supported, the whole pixelRef is loaded when using YUV decoding
    SkPixelRef* pixelRef = bm.pixelRef();
    if ((nullptr == pixelRef) || 
        (pixelRef->info().width()  != bm.info().width()) ||
        (pixelRef->info().height() != bm.info().height())) {
        return nullptr;
    }

    const bool useCache = optionalKey.isValid();
    SkYUVPlanesCache::Info yuvInfo;
    SkAutoTUnref<SkCachedData> cachedData;
    SkAutoMalloc storage;
    if (useCache) {
        cachedData.reset(SkYUVPlanesCache::FindAndRef(pixelRef->getGenerationID(), &yuvInfo));
    }

    void* planes[3];
    if (cachedData.get()) {
        planes[0] = (void*)cachedData->data();
        planes[1] = (uint8_t*)planes[0] + yuvInfo.fSizeInMemory[0];
        planes[2] = (uint8_t*)planes[1] + yuvInfo.fSizeInMemory[1];
    } else {
        // Fetch yuv plane sizes for memory allocation. Here, width and height can be
        // rounded up to JPEG block size and be larger than the image's width and height.
        if (!pixelRef->getYUV8Planes(yuvInfo.fSize, nullptr, nullptr, nullptr)) {
            return nullptr;
        }

        // Allocate the memory for YUV
        size_t totalSize(0);
        for (int i = 0; i < 3; ++i) {
            yuvInfo.fRowBytes[i] = yuvInfo.fSize[i].fWidth;
            yuvInfo.fSizeInMemory[i] = yuvInfo.fRowBytes[i] * yuvInfo.fSize[i].fHeight;
            totalSize += yuvInfo.fSizeInMemory[i];
        }
        if (useCache) {
            cachedData.reset(SkResourceCache::NewCachedData(totalSize));
            planes[0] = cachedData->writable_data();
        } else {
            storage.reset(totalSize);
            planes[0] = storage.get();
        }
        planes[1] = (uint8_t*)planes[0] + yuvInfo.fSizeInMemory[0];
        planes[2] = (uint8_t*)planes[1] + yuvInfo.fSizeInMemory[1];

        // Get the YUV planes and update plane sizes to actual image size
        if (!pixelRef->getYUV8Planes(yuvInfo.fSize, planes, yuvInfo.fRowBytes,
                                     &yuvInfo.fColorSpace)) {
            return nullptr;
        }

        if (useCache) {
            // Decoding is done, cache the resulting YUV planes
            SkYUVPlanesCache::Add(pixelRef->getGenerationID(), cachedData, &yuvInfo);
        }
    }

    GrSurfaceDesc yuvDesc;
    yuvDesc.fConfig = kAlpha_8_GrPixelConfig;
    SkAutoTUnref<GrTexture> yuvTextures[3];
    for (int i = 0; i < 3; ++i) {
        yuvDesc.fWidth  = yuvInfo.fSize[i].fWidth;
        yuvDesc.fHeight = yuvInfo.fSize[i].fHeight;
        bool needsExactTexture =
            (yuvDesc.fWidth  != yuvInfo.fSize[0].fWidth) ||
            (yuvDesc.fHeight != yuvInfo.fSize[0].fHeight);
        if (needsExactTexture) {
            yuvTextures[i].reset(ctx->textureProvider()->createTexture(yuvDesc, true));
        } else {
            yuvTextures[i].reset(ctx->textureProvider()->createApproxTexture(yuvDesc));
        }
        if (!yuvTextures[i] ||
            !yuvTextures[i]->writePixels(0, 0, yuvDesc.fWidth, yuvDesc.fHeight,
                                         yuvDesc.fConfig, planes[i], yuvInfo.fRowBytes[i])) {
            return nullptr;
        }
    }

    GrSurfaceDesc rtDesc = desc;
    rtDesc.fFlags = rtDesc.fFlags | kRenderTarget_GrSurfaceFlag;

    GrTexture* result = create_texture_for_bmp(ctx, optionalKey, rtDesc, pixelRef, nullptr, 0);
    if (!result) {
        return nullptr;
    }

    GrRenderTarget* renderTarget = result->asRenderTarget();
    SkASSERT(renderTarget);

    GrPaint paint;
    SkAutoTUnref<GrFragmentProcessor>
        yuvToRgbProcessor(GrYUVtoRGBEffect::Create(paint.getProcessorDataManager(), yuvTextures[0],
                                                   yuvTextures[1], yuvTextures[2],
                                                   yuvInfo.fSize, yuvInfo.fColorSpace));
    paint.addColorFragmentProcessor(yuvToRgbProcessor);
    SkRect r = SkRect::MakeWH(SkIntToScalar(yuvInfo.fSize[0].fWidth),
                              SkIntToScalar(yuvInfo.fSize[0].fHeight));

//.........这里部分代码省略.........

static int filter_picture(const SkString& inFile, const SkString& outFile) {
    SkAutoTUnref<SkPicture> inPicture;

    SkFILEStream inStream(inFile.c_str());
    if (inStream.isValid()) {
        inPicture.reset(SkPicture::CreateFromStream(&inStream));
    }

    if (nullptr == inPicture.get()) {
        SkDebugf("Could not read file %s\n", inFile.c_str());
        return -1;
    }

    int localCount[SK_ARRAY_COUNT(gOptTable)];

    memset(localCount, 0, sizeof(localCount));

    SkDebugCanvas debugCanvas(SkScalarCeilToInt(inPicture->cullRect().width()),
                              SkScalarCeilToInt(inPicture->cullRect().height()));
    inPicture->playback(&debugCanvas);

    // delete the initial save and restore since replaying the commands will
    // re-add them
    if (debugCanvas.getSize() > 1) {
        debugCanvas.deleteDrawCommandAt(0);
        debugCanvas.deleteDrawCommandAt(debugCanvas.getSize()-1);
    }

    bool changed = true;
    int numBefore = debugCanvas.getSize();

    while (changed) {
        changed = false;
        for (int i = 0; i < debugCanvas.getSize(); ++i) {
            for (size_t opt = 0; opt < SK_ARRAY_COUNT(gOptTable); ++opt) {
                if ((*gOptTable[opt].fCheck)(&debugCanvas, i)) {
                    (*gOptTable[opt].fApply)(&debugCanvas, i);

                    ++gOptTable[opt].fNumTimesApplied;
                    ++localCount[opt];

                    if (debugCanvas.getSize() == i) {
                        // the optimization removed all the remaining operations
                        break;
                    }

                    opt = 0;          // try all the opts all over again
                    changed = true;
                }
            }
        }
    }

    int numAfter = debugCanvas.getSize();

    if (!outFile.isEmpty()) {
        SkPictureRecorder recorder;
        SkCanvas* canvas = recorder.beginRecording(inPicture->cullRect().width(),
                                                   inPicture->cullRect().height(),
                                                   nullptr, 0);
        debugCanvas.draw(canvas);
        SkAutoTUnref<SkPicture> outPicture(recorder.endRecording());

        SkFILEWStream outStream(outFile.c_str());

        outPicture->serialize(&outStream);
    }

    bool someOptFired = false;
    for (size_t opt = 0; opt < SK_ARRAY_COUNT(gOptTable); ++opt) {
        if (0 != localCount[opt]) {
            SkDebugf("%d: %d ", opt, localCount[opt]);
            someOptFired = true;
        }
    }

    if (!someOptFired) {
        SkDebugf("No opts fired\n");
    } else {
        SkDebugf("\t before: %d after: %d delta: %d\n",
                 numBefore, numAfter, numBefore-numAfter);
    }

    return 0;
}

GrContext* GrContextFactory::get(GLContextType type, GrGLStandard forcedGpuAPI) {
    for (int i = 0; i < fContexts.count(); ++i) {
        if (forcedGpuAPI != kNone_GrGLStandard &&
            forcedGpuAPI != fContexts[i].fGLContext->gl()->fStandard)
            continue;

        if (fContexts[i].fType == type) {
            fContexts[i].fGLContext->makeCurrent();
            return fContexts[i].fGrContext;
        }
    }
    SkAutoTUnref<SkGLContext> glCtx;
    SkAutoTUnref<GrContext> grCtx;
    switch (type) {
        case kNVPR_GLContextType: // fallthru
        case kNative_GLContextType:
            glCtx.reset(SkCreatePlatformGLContext(forcedGpuAPI));
            break;
#ifdef SK_ANGLE
        case kANGLE_GLContextType:
            glCtx.reset(SkANGLEGLContext::Create(forcedGpuAPI));
            break;
#endif
#ifdef SK_MESA
        case kMESA_GLContextType:
            glCtx.reset(SkMesaGLContext::Create(forcedGpuAPI));
            break;
#endif
        case kNull_GLContextType:
            glCtx.reset(SkNullGLContext::Create(forcedGpuAPI));
            break;
        case kDebug_GLContextType:
            glCtx.reset(SkDebugGLContext::Create(forcedGpuAPI));
            break;
    }
    if (NULL == glCtx.get()) {
        return NULL;
    }

    SkASSERT(glCtx->isValid());

    // Block NVPR from non-NVPR types.
    SkAutoTUnref<const GrGLInterface> glInterface(SkRef(glCtx->gl()));
    if (kNVPR_GLContextType != type) {
        glInterface.reset(GrGLInterfaceRemoveNVPR(glInterface));
        if (!glInterface) {
            return NULL;
        }
    } else {
        if (!glInterface->hasExtension("GL_NV_path_rendering")) {
            return NULL;
        }
    }

    glCtx->makeCurrent();
    GrBackendContext p3dctx = reinterpret_cast<GrBackendContext>(glInterface.get());
    grCtx.reset(GrContext::Create(kOpenGL_GrBackend, p3dctx, fGlobalOptions));
    if (!grCtx.get()) {
        return NULL;
    }
    // Warn if path rendering support is not available for the NVPR type.
    if (kNVPR_GLContextType == type) {
        if (!grCtx->caps()->shaderCaps()->pathRenderingSupport()) {
            GrGLGpu* gpu = static_cast<GrGLGpu*>(grCtx->getGpu());
            const GrGLubyte* verUByte;
            GR_GL_CALL_RET(gpu->glInterface(), verUByte, GetString(GR_GL_VERSION));
            const char* ver = reinterpret_cast<const char*>(verUByte);
            SkDebugf("\nWARNING: nvprmsaa config requested, but driver path rendering support not"
                     " available. Maybe update the driver? Your driver version string: \"%s\"\n", ver);
        }
    }

    GPUContext& ctx = fContexts.push_back();
    ctx.fGLContext = glCtx.get();
    ctx.fGLContext->ref();
    ctx.fGrContext = grCtx.get();
    ctx.fGrContext->ref();
    ctx.fType = type;
    return ctx.fGrContext;
}

DEF_TEST(RecordOpts_MergeSvgOpacityAndFilterLayers, r) {
    SkRecord record;
    SkRecorder recorder(&record, W, H);

    SkRect bounds = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(200));
    SkRect clip = SkRect::MakeWH(SkIntToScalar(50), SkIntToScalar(60));

    SkPaint alphaOnlyLayerPaint;
    alphaOnlyLayerPaint.setColor(0x03000000);  // Only alpha.
    SkPaint translucentLayerPaint;
    translucentLayerPaint.setColor(0x03040506);  // Not only alpha.
    SkPaint xfermodePaint;
    xfermodePaint.setXfermodeMode(SkXfermode::kDstIn_Mode);
    SkPaint colorFilterPaint;
    colorFilterPaint.setColorFilter(
        SkColorFilter::CreateModeFilter(SK_ColorLTGRAY, SkXfermode::kSrcIn_Mode))->unref();

    SkPaint opaqueFilterLayerPaint;
    opaqueFilterLayerPaint.setColor(0xFF020202);  // Opaque.
    SkPaint translucentFilterLayerPaint;
    translucentFilterLayerPaint.setColor(0x0F020202);  // Not opaque.
    SkAutoTUnref<SkPicture> shape;
    {
        SkPictureRecorder recorder;
        SkCanvas* canvas = recorder.beginRecording(SkIntToScalar(100), SkIntToScalar(100));
        SkPaint shapePaint;
        shapePaint.setColor(SK_ColorWHITE);
        canvas->drawRect(SkRect::MakeWH(SkIntToScalar(50), SkIntToScalar(50)), shapePaint);
        shape.reset(recorder.endRecordingAsPicture());
    }
    translucentFilterLayerPaint.setImageFilter(SkPictureImageFilter::Create(shape))->unref();

    int index = 0;

    {
        // Any combination of these should cause the pattern to be optimized.
        SkRect* firstBounds[] = { NULL, &bounds };
        SkPaint* firstPaints[] = { NULL, &alphaOnlyLayerPaint };
        SkRect* secondBounds[] = { NULL, &bounds };
        SkPaint* secondPaints[] = { &opaqueFilterLayerPaint, &translucentFilterLayerPaint };

        for (size_t i = 0; i < SK_ARRAY_COUNT(firstBounds); ++ i) {
            for (size_t j = 0; j < SK_ARRAY_COUNT(firstPaints); ++j) {
                for (size_t k = 0; k < SK_ARRAY_COUNT(secondBounds); ++k) {
                    for (size_t m = 0; m < SK_ARRAY_COUNT(secondPaints); ++m) {
                        recorder.saveLayer(firstBounds[i], firstPaints[j]);
                        recorder.save();
                        recorder.clipRect(clip);
                        recorder.saveLayer(secondBounds[k], secondPaints[m]);
                        recorder.restore();
                        recorder.restore();
                        recorder.restore();
                        assert_merge_svg_opacity_and_filter_layers(r, &record, index, true);
                        index += 7;
                    }
                }
            }
        }
    }

    // These should cause the pattern to stay unoptimized:
    struct {
        SkPaint* firstPaint;
        SkPaint* secondPaint;
    } noChangeTests[] = {
        // No change: NULL filter layer paint not implemented.
        { &alphaOnlyLayerPaint, NULL },
        // No change: layer paint is not alpha-only.
        { &translucentLayerPaint, &opaqueFilterLayerPaint },
        // No change: layer paint has an xfereffect.
        { &xfermodePaint, &opaqueFilterLayerPaint },
        // No change: filter layer paint has an xfereffect.
        { &alphaOnlyLayerPaint, &xfermodePaint },
        // No change: layer paint has a color filter.
        { &colorFilterPaint, &opaqueFilterLayerPaint },
        // No change: filter layer paint has a color filter (until the optimization accounts for
        // constant color draws that can filter the color).
        { &alphaOnlyLayerPaint, &colorFilterPaint }
    };

    for (size_t i = 0; i < SK_ARRAY_COUNT(noChangeTests); ++i) {
        recorder.saveLayer(NULL, noChangeTests[i].firstPaint);
        recorder.save();
        recorder.clipRect(clip);
        recorder.saveLayer(NULL, noChangeTests[i].secondPaint);
        recorder.restore();
        recorder.restore();
        recorder.restore();
        assert_merge_svg_opacity_and_filter_layers(r, &record, index, false);
        index += 7;
    }

    // Test the folded alpha value.
    recorder.saveLayer(NULL, &alphaOnlyLayerPaint);
    recorder.save();
    recorder.clipRect(clip);
    recorder.saveLayer(NULL, &opaqueFilterLayerPaint);
    recorder.restore();
    recorder.restore();
    recorder.restore();
//.........这里部分代码省略.........

GrContextFactory::ContextInfo* GrContextFactory::getContextInfo(GLContextType type,
                                                                GLContextOptions options) {
    for (int i = 0; i < fContexts.count(); ++i) {
        if (fContexts[i]->fType == type &&
            fContexts[i]->fOptions == options) {
            fContexts[i]->fGLContext->makeCurrent();
            return fContexts[i];
        }
    }
    SkAutoTUnref<SkGLContext> glCtx;
    SkAutoTUnref<GrContext> grCtx;
    switch (type) {
        case kNative_GLContextType:
            glCtx.reset(SkCreatePlatformGLContext(kNone_GrGLStandard));
            break;
        case kGL_GLContextType:
            glCtx.reset(SkCreatePlatformGLContext(kGL_GrGLStandard));
            break;
        case kGLES_GLContextType:
            glCtx.reset(SkCreatePlatformGLContext(kGLES_GrGLStandard));
            break;
#if SK_ANGLE
#ifdef SK_BUILD_FOR_WIN
        case kANGLE_GLContextType:
            glCtx.reset(SkANGLEGLContext::CreateDirectX());
            break;
#endif
        case kANGLE_GL_GLContextType:
            glCtx.reset(SkANGLEGLContext::CreateOpenGL());
            break;
#endif
#if SK_COMMAND_BUFFER
        case kCommandBuffer_GLContextType:
            glCtx.reset(SkCommandBufferGLContext::Create());
            break;
#endif
#if SK_MESA
        case kMESA_GLContextType:
            glCtx.reset(SkMesaGLContext::Create());
            break;
#endif
        case kNull_GLContextType:
            glCtx.reset(SkNullGLContext::Create());
            break;
        case kDebug_GLContextType:
            glCtx.reset(SkDebugGLContext::Create());
            break;
    }
    if (nullptr == glCtx.get()) {
        return nullptr;
    }

    SkASSERT(glCtx->isValid());

    // Block NVPR from non-NVPR types.
    SkAutoTUnref<const GrGLInterface> glInterface(SkRef(glCtx->gl()));
    if (!(kEnableNVPR_GLContextOptions & options)) {
        glInterface.reset(GrGLInterfaceRemoveNVPR(glInterface));
        if (!glInterface) {
            return nullptr;
        }
    }

    glCtx->makeCurrent();
    GrBackendContext p3dctx = reinterpret_cast<GrBackendContext>(glInterface.get());
#ifdef SK_VULKAN
    grCtx.reset(GrContext::Create(kVulkan_GrBackend, p3dctx, fGlobalOptions));
#else
    grCtx.reset(GrContext::Create(kOpenGL_GrBackend, p3dctx, fGlobalOptions));
#endif
    if (!grCtx.get()) {
        return nullptr;
    }
    if (kEnableNVPR_GLContextOptions & options) {
        if (!grCtx->caps()->shaderCaps()->pathRenderingSupport()) {
            return nullptr;
        }
    }

    ContextInfo* ctx = fContexts.emplace_back(new ContextInfo);
    ctx->fGLContext = SkRef(glCtx.get());
    ctx->fGrContext = SkRef(grCtx.get());
    ctx->fType = type;
    ctx->fOptions = options;
    return ctx;
}

    void onPrepareDraws(Target* target) override {
        SkAutoTUnref<const GrGeometryProcessor> gp;
        {
            using namespace GrDefaultGeoProcFactory;
            Color color(this->color());
            Coverage coverage(this->coverage());
            if (this->coverageIgnored()) {
                coverage.fType = Coverage::kNone_Type;
            }
            LocalCoords localCoords(this->usesLocalCoords() ? LocalCoords::kUsePosition_Type :
                                                              LocalCoords::kUnused_Type);
            gp.reset(GrDefaultGeoProcFactory::Create(color, coverage, localCoords,
                                                     this->viewMatrix()));
        }

        size_t vertexStride = gp->getVertexStride();
        SkASSERT(vertexStride == sizeof(SkPoint));

        target->initDraw(gp, this->pipeline());

        int instanceCount = fGeoData.count();

        // compute number of vertices
        int maxVertices = 0;

        // We will use index buffers if we have multiple paths or one path with multiple contours
        bool isIndexed = instanceCount > 1;
        for (int i = 0; i < instanceCount; i++) {
            Geometry& args = fGeoData[i];

            int contourCount;
            maxVertices += GrPathUtils::worstCasePointCount(args.fPath, &contourCount,
                                                            args.fTolerance);

            isIndexed = isIndexed || contourCount > 1;
        }

        if (maxVertices == 0 || maxVertices > ((int)SK_MaxU16 + 1)) {
            SkDebugf("Cannot render path (%d)\n", maxVertices);
            return;
        }

        // determine primitiveType
        int maxIndices = 0;
        GrPrimitiveType primitiveType;
        if (this->isHairline()) {
            if (isIndexed) {
                maxIndices = 2 * maxVertices;
                primitiveType = kLines_GrPrimitiveType;
            } else {
                primitiveType = kLineStrip_GrPrimitiveType;
            }
        } else {
            if (isIndexed) {
                maxIndices = 3 * maxVertices;
                primitiveType = kTriangles_GrPrimitiveType;
            } else {
                primitiveType = kTriangleFan_GrPrimitiveType;
            }
        }

        // allocate vertex / index buffers
        const GrVertexBuffer* vertexBuffer;
        int firstVertex;

        void* verts = target->makeVertexSpace(vertexStride, maxVertices,
                                              &vertexBuffer, &firstVertex);

        if (!verts) {
            SkDebugf("Could not allocate vertices\n");
            return;
        }

        const GrIndexBuffer* indexBuffer = nullptr;
        int firstIndex = 0;

        void* indices = nullptr;
        if (isIndexed) {
            indices = target->makeIndexSpace(maxIndices, &indexBuffer, &firstIndex);

            if (!indices) {
                SkDebugf("Could not allocate indices\n");
                return;
            }
        }

        // fill buffers
        int vertexOffset = 0;
        int indexOffset = 0;
        for (int i = 0; i < instanceCount; i++) {
            Geometry& args = fGeoData[i];

            int vertexCnt = 0;
            int indexCnt = 0;
            if (!this->createGeom(verts,
                                  vertexOffset,
                                  indices,
                                  indexOffset,
                                  &vertexCnt,
                                  &indexCnt,
//.........这里部分代码省略.........

static inline bool skpaint_to_grpaint_impl(GrContext* context,
                                           const SkPaint& skPaint,
                                           const SkMatrix& viewM,
                                           const GrFragmentProcessor** shaderProcessor,
                                           SkXfermode::Mode* primColorMode,
                                           bool primitiveIsSrc,
                                           GrPaint* grPaint) {
    grPaint->setAntiAlias(skPaint.isAntiAlias());

    // Setup the initial color considering the shader, the SkPaint color, and the presence or not
    // of per-vertex colors.
    SkAutoTUnref<const GrFragmentProcessor> aufp;
    const GrFragmentProcessor* shaderFP = nullptr;
    if (!primColorMode || blend_requires_shader(*primColorMode, primitiveIsSrc)) {
        if (shaderProcessor) {
            shaderFP = *shaderProcessor;
        } else if (const SkShader* shader = skPaint.getShader()) {
            aufp.reset(shader->asFragmentProcessor(context, viewM, nullptr,
                                                   skPaint.getFilterQuality()));
            shaderFP = aufp;
            if (!shaderFP) {
                return false;
            }
        }
    }

    // Set this in below cases if the output of the shader/paint-color/paint-alpha/primXfermode is
    // a known constant value. In that case we can simply apply a color filter during this
    // conversion without converting the color filter to a GrFragmentProcessor.
    bool applyColorFilterToPaintColor = false;
    if (shaderFP) {
        if (primColorMode) {
            // There is a blend between the primitive color and the shader color. The shader sees
            // the opaque paint color. The shader's output is blended using the provided mode by
            // the primitive color. The blended color is then modulated by the paint's alpha.

            // The geometry processor will insert the primitive color to start the color chain, so
            // the GrPaint color will be ignored.

            GrColor shaderInput = SkColorToOpaqueGrColor(skPaint.getColor());

            shaderFP = GrFragmentProcessor::OverrideInput(shaderFP, shaderInput);
            aufp.reset(shaderFP);

            if (primitiveIsSrc) {
                shaderFP = GrXfermodeFragmentProcessor::CreateFromDstProcessor(shaderFP,
                                                                               *primColorMode);
            } else {
                shaderFP = GrXfermodeFragmentProcessor::CreateFromSrcProcessor(shaderFP,
                                                                               *primColorMode);
            }
            aufp.reset(shaderFP);
            // The above may return null if compose results in a pass through of the prim color.
            if (shaderFP) {
                grPaint->addColorFragmentProcessor(shaderFP);
            }

            GrColor paintAlpha = SkColorAlphaToGrColor(skPaint.getColor());
            if (GrColor_WHITE != paintAlpha) {
                grPaint->addColorFragmentProcessor(GrConstColorProcessor::Create(
                    paintAlpha, GrConstColorProcessor::kModulateRGBA_InputMode))->unref();
            }
        } else {
            // The shader's FP sees the paint unpremul color
            grPaint->setColor(SkColorToUnpremulGrColor(skPaint.getColor()));
            grPaint->addColorFragmentProcessor(shaderFP);
        }
    } else {
        if (primColorMode) {
            // There is a blend between the primitive color and the paint color. The blend considers
            // the opaque paint color. The paint's alpha is applied to the post-blended color.
            SkAutoTUnref<const GrFragmentProcessor> processor(
                GrConstColorProcessor::Create(SkColorToOpaqueGrColor(skPaint.getColor()),
                                              GrConstColorProcessor::kIgnore_InputMode));
            if (primitiveIsSrc) {
                processor.reset(GrXfermodeFragmentProcessor::CreateFromDstProcessor(processor,
                                                                                *primColorMode));
            } else {
                processor.reset(GrXfermodeFragmentProcessor::CreateFromSrcProcessor(processor,
                                                                                *primColorMode));

            }
            if (processor) {
                grPaint->addColorFragmentProcessor(processor);
            }

            grPaint->setColor(SkColorToOpaqueGrColor(skPaint.getColor()));

            GrColor paintAlpha = SkColorAlphaToGrColor(skPaint.getColor());
            if (GrColor_WHITE != paintAlpha) {
                grPaint->addColorFragmentProcessor(GrConstColorProcessor::Create(
                    paintAlpha, GrConstColorProcessor::kModulateRGBA_InputMode))->unref();
            }
        } else {
            // No shader, no primitive color.
            grPaint->setColor(SkColorToPremulGrColor(skPaint.getColor()));
            applyColorFilterToPaintColor = true;
        }
    }

//.........这里部分代码省略.........

//.........这里部分代码省略.........
            const SkImage* image = fPictureData->getImage(reader);
            const SkRect* src = get_rect_ptr(reader);   // may be null
            const SkRect& dst = reader->skipT<SkRect>();     // required
            canvas->drawImageRect(image, src, dst, paint);
        } break;
        case DRAW_OVAL: {
            const SkPaint& paint = *fPictureData->getPaint(reader);
            canvas->drawOval(reader->skipT<SkRect>(), paint);
        } break;
        case DRAW_PAINT:
            canvas->drawPaint(*fPictureData->getPaint(reader));
            break;
        case DRAW_PATCH: {
            const SkPaint& paint = *fPictureData->getPaint(reader);

            const SkPoint* cubics = (const SkPoint*)reader->skip(SkPatchUtils::kNumCtrlPts *
                                                                 sizeof(SkPoint));
            uint32_t flag = reader->readInt();
            const SkColor* colors = NULL;
            if (flag & DRAW_VERTICES_HAS_COLORS) {
                colors = (const SkColor*)reader->skip(SkPatchUtils::kNumCorners * sizeof(SkColor));
            }
            const SkPoint* texCoords = NULL;
            if (flag & DRAW_VERTICES_HAS_TEXS) {
                texCoords = (const SkPoint*)reader->skip(SkPatchUtils::kNumCorners *
                                                         sizeof(SkPoint));
            }
            SkAutoTUnref<SkXfermode> xfer;
            if (flag & DRAW_VERTICES_HAS_XFER) {
                int mode = reader->readInt();
                if (mode < 0 || mode > SkXfermode::kLastMode) {
                    mode = SkXfermode::kModulate_Mode;
                }
                xfer.reset(SkXfermode::Create((SkXfermode::Mode)mode));
            }
            canvas->drawPatch(cubics, colors, texCoords, xfer, paint);
        } break;
        case DRAW_PATH: {
            const SkPaint& paint = *fPictureData->getPaint(reader);
            canvas->drawPath(fPictureData->getPath(reader), paint);
        } break;
        case DRAW_PICTURE:
            canvas->drawPicture(fPictureData->getPicture(reader));
            break;
        case DRAW_PICTURE_MATRIX_PAINT: {
            const SkPaint* paint = fPictureData->getPaint(reader);
            SkMatrix matrix;
            reader->readMatrix(&matrix);
            const SkPicture* pic = fPictureData->getPicture(reader);
            canvas->drawPicture(pic, &matrix, paint);
        } break;
        case DRAW_POINTS: {
            const SkPaint& paint = *fPictureData->getPaint(reader);
            SkCanvas::PointMode mode = (SkCanvas::PointMode)reader->readInt();
            size_t count = reader->readInt();
            const SkPoint* pts = (const SkPoint*)reader->skip(sizeof(SkPoint)* count);
            canvas->drawPoints(mode, count, pts, paint);
        } break;
        case DRAW_POS_TEXT: {
            const SkPaint& paint = *fPictureData->getPaint(reader);
            TextContainer text;
            get_text(reader, &text);
            size_t points = reader->readInt();
            const SkPoint* pos = (const SkPoint*)reader->skip(points * sizeof(SkPoint));
            canvas->drawPosText(text.text(), text.length(), pos, paint);
        } break;

int main(void) {
    GLFWwindow* window;
    glfwSetErrorCallback(error_callback);
    if (!glfwInit()) {
        exit(EXIT_FAILURE);
    }
    
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_SRGB_CAPABLE, GL_TRUE);
    
    window = glfwCreateWindow(kWidth, kHeight, "Simple example", NULL, NULL);
    if (!window) {
        glfwTerminate();
        exit(EXIT_FAILURE);
    }
    glfwMakeContextCurrent(window);
    
    init_skia(kWidth, kHeight);
    
    SkAutoTUnref<SkImage> atlas;
    SkRSXform   xform[kGrid*kGrid+1];
    SkRect      tex[kGrid*kGrid+1];
    WallTimer   timer;
    float       times[32];
    int         currentTime;

    SkAutoTUnref<SkData> imageData(SkData::NewFromFileName("ship.png"));
    atlas.reset(SkImage::NewFromEncoded(imageData));
    if (!atlas) {
        SkDebugf("\nCould not decode file ship.png\n");
        
        cleanup_skia();
        glfwDestroyWindow(window);
        glfwTerminate();
        exit(EXIT_FAILURE);
    }
    
    SkScalar anchorX = atlas->width()*0.5f;
    SkScalar anchorY = atlas->height()*0.5f;
    int currIndex = 0;
    for (int x = 0; x < kGrid; x++) {
        for (int y = 0; y < kGrid; y++) {
            float xPos = (x / (kGrid - 1.0)) * kWidth;
            float yPos = (y / (kGrid - 1.0)) * kWidth;
            
            tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height());
            xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f,
                                                          xPos, yPos, anchorX, anchorY);
            currIndex++;
        }
    }
    tex[currIndex] = SkRect::MakeLTRB(0.0f, 0.0f, atlas->width(), atlas->height());
    xform[currIndex] = SkRSXform::MakeFromRadians(2.0f, SK_ScalarPI*0.5f,
                                                  kWidth*0.5f, kHeight*0.5f, anchorX, anchorY);
    
    currentTime = 0;
    
    glfwSwapInterval(1);
    glfwSetKeyCallback(window, key_callback);
    
    // Draw to the surface via its SkCanvas.
    SkCanvas* canvas = sSurface->getCanvas();   // We don't manage this pointer's lifetime.
    SkPaint paint;
    paint.setFilterQuality(kLow_SkFilterQuality);
    paint.setColor(SK_ColorWHITE);
    paint.setTextSize(15.0f);

    while (!glfwWindowShouldClose(window)) {
        const float kCosDiff = 0.99984769515f;
        const float kSinDiff = 0.01745240643f;

        timer.start();
        
        glfwPollEvents();
        
        float meanTime = 0.0f;
        for (int i = 0; i < 32; ++i) {
            meanTime += times[i];
        }
        meanTime /= 32.f;
        char outString[64];
        float fps = 1000.f/meanTime;
        sprintf(outString, "fps: %f ms: %f", fps, meanTime);
        
        for (int i = 0; i < kGrid*kGrid+1; ++i) {
            SkScalar c = xform[i].fSCos;
            SkScalar s = xform[i].fSSin;
        
            SkScalar dx = c*anchorX - s*anchorY;
            SkScalar dy = s*anchorX + c*anchorY;

            xform[i].fSCos = kCosDiff*c - kSinDiff*s;
            xform[i].fSSin = kSinDiff*c + kCosDiff*s;
            
            dx -= xform[i].fSCos*anchorX - xform[i].fSSin*anchorY;
            dy -= xform[i].fSSin*anchorX + xform[i].fSCos*anchorY;
            xform[i].fTx += dx;
//.........这里部分代码省略.........