// https://bug.skia.org/2894
DEF_TEST(BitmapCache_add_rect, reporter) {
    SkResourceCache::DiscardableFactory factory = SkResourceCache::GetDiscardableFactory();
    SkBitmap::Allocator* allocator = SkBitmapCache::GetAllocator();

    SkAutoTDelete<SkResourceCache> cache;
    if (factory) {
        cache.reset(new SkResourceCache(factory));
    } else {
        const size_t byteLimit = 100 * 1024;
        cache.reset(new SkResourceCache(byteLimit));
    }
    SkBitmap cachedBitmap;
    make_bitmap(&cachedBitmap, SkImageInfo::MakeN32Premul(5, 5), allocator);
    cachedBitmap.setImmutable();

    SkBitmap bm;
    SkIRect rect = SkIRect::MakeWH(5, 5);
    uint32_t cachedID = cachedBitmap.getGenerationID();
    SkPixelRef* cachedPR = cachedBitmap.pixelRef();

    // Wrong subset size
    REPORTER_ASSERT(reporter, !SkBitmapCache::Add(cachedPR, SkIRect::MakeWH(4, 6), cachedBitmap, cache));
    REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedID, rect, &bm, cache));
    // Wrong offset value
    REPORTER_ASSERT(reporter, !SkBitmapCache::Add(cachedPR, SkIRect::MakeXYWH(-1, 0, 5, 5), cachedBitmap, cache));
    REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedID, rect, &bm, cache));

    // Should not be in the cache
    REPORTER_ASSERT(reporter, !SkBitmapCache::Find(cachedID, rect, &bm, cache));

    REPORTER_ASSERT(reporter, SkBitmapCache::Add(cachedPR, rect, cachedBitmap, cache));
    // Should be in the cache, we just added it
    REPORTER_ASSERT(reporter, SkBitmapCache::Find(cachedID, rect, &bm, cache));
}
void DecodingBench::onDraw(const int n, SkCanvas* canvas) {
    SkBitmap bitmap;
    // Declare the allocator before the decoder, so it will outlive the
    // decoder, which will unref it.
    UseExistingAllocator allocator(fBitmap.pixelRef());
    SkAutoTDelete<SkImageDecoder> decoder;
    SkAutoTDelete<SkStreamRewindable> stream;
    for (int i = 0; i < n; i++) {
        // create a new stream and a new decoder to mimic the behavior of
        // CodecBench.
        stream.reset(new SkMemoryStream(fData));
        decoder.reset(SkImageDecoder::Factory(stream));
        decoder->setAllocator(&allocator);
        decoder->decode(stream, &bitmap, fColorType,
                        SkImageDecoder::kDecodePixels_Mode);
    }
}
Exemplo n.º 3
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void BitmapRegionDecoderBench::onDraw(const int n, SkCanvas* canvas) {
    SkAutoTDelete<SkBitmap> bitmap;
    for (int i = 0; i < n; i++) {
        bitmap.reset(fBRD->decodeRegion(fSubset.left(), fSubset.top(), fSubset.width(),
                fSubset.height(), fSampleSize, fColorType));
        SkASSERT(nullptr != bitmap.get());
    }
}
Exemplo n.º 4
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bool GrGLShaderBuilder::GenProgram(GrGpuGL* gpu,
                                   GrGLUniformManager* uman,
                                   const GrGLProgramDesc& desc,
                                   const GrEffectStage* inColorStages[],
                                   const GrEffectStage* inCoverageStages[],
                                   GenProgramOutput* output) {
    SkAutoTDelete<GrGLShaderBuilder> builder;
    if (desc.getHeader().fHasVertexCode ||!gpu->shouldUseFixedFunctionTexturing()) {
        builder.reset(SkNEW_ARGS(GrGLFullShaderBuilder, (gpu, uman, desc)));
    } else {
        builder.reset(SkNEW_ARGS(GrGLFragmentOnlyShaderBuilder, (gpu, uman, desc)));
    }
    if (builder->genProgram(inColorStages, inCoverageStages)) {
        *output = builder->getOutput();
        return true;
    }
    return false;
}
Exemplo n.º 5
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    void runTest(skiatest::Reporter* reporter) {
        SkAutoTDelete<SkAdvancedTypefaceMetrics::AdvanceMetric<int16_t> > result;
        result.reset(getAdvanceData((void*)this, fAdvancesLen, fSubset, fSubsetLen, getAdvance));

        SkString stringResult = stringify_advance_data(result);
        if (!stringResult.equals(fExpected)) {
            ERRORF(reporter, "Expected: %s\n  Result: %s\n", fExpected, stringResult.c_str());
        }
    }
Exemplo n.º 6
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/**
 * Extract either the color or image data from a SkBitmap into a SkStream.
 * @param bitmap        Bitmap to extract data from.
 * @param srcRect       Region in the bitmap to extract.
 * @param extractAlpha  Set to true to extract the alpha data or false to
 *                      extract the color data.
 * @param isTransparent Pointer to a bool to output whether the alpha is
 *                      completely transparent. May be NULL. Only valid when
 *                      extractAlpha == true.
 * @return              Unencoded image data, or NULL if either data was not
 *                      available or alpha data was requested but the image was
 *                      entirely transparent or opaque.
 */
static SkStream* extract_image_data(const SkBitmap& bitmap,
                                    const SkIRect& srcRect,
                                    bool extractAlpha, bool* isTransparent) {
    SkColorType colorType = bitmap.colorType();
    if (extractAlpha && (kIndex_8_SkColorType == colorType ||
                         kRGB_565_SkColorType == colorType)) {
        if (isTransparent != NULL) {
            *isTransparent = false;
        }
        return NULL;
    }

    SkAutoLockPixels lock(bitmap);
    if (NULL == bitmap.getPixels()) {
        return NULL;
    }

    bool isOpaque = true;
    bool transparent = extractAlpha;
    SkAutoTDelete<SkStream> stream;

    switch (colorType) {
        case kIndex_8_SkColorType:
            if (!extractAlpha) {
                stream.reset(extract_index8_image(bitmap, srcRect));
            }
            break;
        case kARGB_4444_SkColorType:
            stream.reset(extract_argb4444_data(bitmap, srcRect, extractAlpha,
                                               &isOpaque, &transparent));
            break;
        case kRGB_565_SkColorType:
            if (!extractAlpha) {
                stream.reset(extract_rgb565_image(bitmap, srcRect));
            }
            break;
        case kN32_SkColorType:
            stream.reset(extract_argb8888_data(bitmap, srcRect, extractAlpha,
                                               &isOpaque, &transparent));
            break;
        case kAlpha_8_SkColorType:
            if (!extractAlpha) {
                stream.reset(create_black_image());
            } else {
                stream.reset(extract_a8_alpha(bitmap, srcRect,
                                              &isOpaque, &transparent));
            }
            break;
        default:
            SkASSERT(false);
    }

    if (isTransparent != NULL) {
        *isTransparent = transparent;
    }
    if (extractAlpha && (transparent || isOpaque)) {
        return NULL;
    }
    return stream.detach();
}
Exemplo n.º 7
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void AndroidCodecBench::onDraw(int n, SkCanvas* canvas) {
    SkAutoTDelete<SkAndroidCodec> codec;
    SkAndroidCodec::AndroidOptions options;
    options.fSampleSize = fSampleSize;
    for (int i = 0; i < n; i++) {
        codec.reset(SkAndroidCodec::NewFromData(fData));
#ifdef SK_DEBUG
        const SkCodec::Result result =
#endif
        codec->getAndroidPixels(fInfo, fPixelStorage.get(), fInfo.minRowBytes(), &options);
        SkASSERT(result == SkCodec::kSuccess || result == SkCodec::kIncompleteInput);
    }
}
Exemplo n.º 8
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void CodecBench::onDraw(const int n, SkCanvas* canvas) {
    SkAutoTDelete<SkCodec> codec;
    SkPMColor colorTable[256];
    int colorCount;
    for (int i = 0; i < n; i++) {
        colorCount = 256;
        codec.reset(SkCodec::NewFromData(fData));
#ifdef SK_DEBUG
        const SkCodec::Result result =
#endif
        codec->getPixels(fInfo, fPixelStorage.get(), fInfo.minRowBytes(),
                         nullptr, colorTable, &colorCount);
        SkASSERT(result == SkCodec::kSuccess
                 || result == SkCodec::kIncompleteInput);
    }
}
Exemplo n.º 9
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// static
SkPDFImage* SkPDFImage::CreateImage(const SkBitmap& bitmap,
                                    const SkIRect& srcRect) {
    if (bitmap.colorType() == kUnknown_SkColorType) {
        return NULL;
    }

    bool isTransparent = false;
    SkAutoTDelete<SkStream> alphaData;
    if (!bitmap.isOpaque()) {
        // Note that isOpaque is not guaranteed to return false for bitmaps
        // with alpha support but a completely opaque alpha channel,
        // so alphaData may still be NULL if we have a completely opaque
        // (or transparent) bitmap.
        alphaData.reset(
                extract_image_data(bitmap, srcRect, true, &isTransparent));
    }
    if (isTransparent) {
        return NULL;
    }

    SkPDFImage* image;
    SkColorType colorType = bitmap.colorType();
    if (alphaData.get() != NULL && (kN32_SkColorType == colorType ||
                                    kARGB_4444_SkColorType == colorType)) {
        if (kN32_SkColorType == colorType) {
            image = SkNEW_ARGS(SkPDFImage, (NULL, bitmap, false,
                                            SkIRect::MakeWH(srcRect.width(),
                                                            srcRect.height())));
        } else {
            SkBitmap unpremulBitmap = unpremultiply_bitmap(bitmap, srcRect);
            image = SkNEW_ARGS(SkPDFImage, (NULL, unpremulBitmap, false,
                                            SkIRect::MakeWH(srcRect.width(),
                                                            srcRect.height())));
        }
    } else {
        image = SkNEW_ARGS(SkPDFImage, (NULL, bitmap, false, srcRect));
    }
    if (alphaData.get() != NULL) {
        SkAutoTUnref<SkPDFImage> mask(
                SkNEW_ARGS(SkPDFImage, (alphaData.get(), bitmap, true, srcRect)));
        image->insert("SMask", new SkPDFObjRef(mask))->unref();
    }
    return image;
}
Exemplo n.º 10
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static int filter_picture(const SkString& inFile, const SkString& outFile) {
    SkAutoTDelete<SkPicture> inPicture;

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

    if (NULL == 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(inPicture->width(), inPicture->height());
    debugCanvas.setBounds(inPicture->width(), inPicture->height());
    inPicture->draw(&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()) {
        SkPicture outPicture;

        SkCanvas* canvas = outPicture.beginRecording(inPicture->width(), inPicture->height());
        debugCanvas.draw(canvas);
        outPicture.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;
}
Exemplo n.º 11
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ContextInfo GrContextFactory::getContextInfo(ContextType type, ContextOptions options) {
    for (int i = 0; i < fContexts.count(); ++i) {
        Context& context = fContexts[i];
        if (context.fType == type &&
            context.fOptions == options &&
            !context.fAbandoned) {
            context.fTestContext->makeCurrent();
            return ContextInfo(context.fBackend, context.fTestContext, context.fGrContext);
        }
    }
    SkAutoTDelete<TestContext> testCtx;
    sk_sp<GrContext> grCtx;
    GrBackendContext backendContext = 0;
    sk_sp<const GrGLInterface> glInterface;
    GrBackend backend = ContextTypeBackend(type);
    switch (backend) {
        case kOpenGL_GrBackend: {
            GLTestContext* glCtx;
            switch (type) {
                case kGL_ContextType:
                    glCtx = CreatePlatformGLTestContext(kGL_GrGLStandard);
                    break;
                case kGLES_ContextType:
                    glCtx = CreatePlatformGLTestContext(kGLES_GrGLStandard);
                    break;
#if SK_ANGLE
#   ifdef SK_BUILD_FOR_WIN
                case kANGLE_ContextType:
                    glCtx = CreateANGLEDirect3DGLTestContext();
                    break;
#   endif
                case kANGLE_GL_ContextType:
                    glCtx = CreateANGLEOpenGLGLTestContext();
                    break;
#endif
#if SK_COMMAND_BUFFER
                case kCommandBuffer_ContextType:
                    glCtx = CommandBufferGLTestContext::Create();
                    break;
#endif
#if SK_MESA
                case kMESA_ContextType:
                    glCtx = CreateMesaGLTestContext();
                    break;
#endif
                case kNullGL_ContextType:
                    glCtx = CreateNullGLTestContext(kEnableNVPR_ContextOptions & options);
                    break;
                case kDebugGL_ContextType:
                    glCtx = CreateDebugGLTestContext();
                    break;
                default:
                    return ContextInfo();
            }
            if (!glCtx) {
                return ContextInfo();
            }
            testCtx.reset(glCtx);
            glInterface.reset(SkRef(glCtx->gl()));
            // Block NVPR from non-NVPR types. We don't block NVPR from contexts that will use
            // instanced rendering because that would prevent us from testing mixed samples.
            if (!((kEnableNVPR_ContextOptions | kUseInstanced_ContextOptions) & options)) {
                glInterface.reset(GrGLInterfaceRemoveNVPR(glInterface.get()));
                if (!glInterface) {
                    return ContextInfo();
                }
            }
            backendContext = reinterpret_cast<GrBackendContext>(glInterface.get());
            break;
        }
#ifdef SK_VULKAN
        case kVulkan_GrBackend:
            SkASSERT(kVulkan_ContextType == type);
            if (kEnableNVPR_ContextOptions & options) {
                return ContextInfo();
            }
            testCtx.reset(CreatePlatformVkTestContext());
            if (!testCtx) {
                return ContextInfo();
            }

            // There is some bug (either in Skia or the NV Vulkan driver) where VkDevice
            // destruction will hang occaisonally. For some reason having an existing GL
            // context fixes this.
            if (!fSentinelGLContext) {
                fSentinelGLContext.reset(CreatePlatformGLTestContext(kGL_GrGLStandard));
                if (!fSentinelGLContext) {
                    fSentinelGLContext.reset(CreatePlatformGLTestContext(kGLES_GrGLStandard));
                }
            }
            backendContext = testCtx->backendContext();
            break;
#endif
        default:
            return ContextInfo();
    }
    testCtx->makeCurrent();
    SkASSERT(testCtx && testCtx->backend() == backend);
    GrContextOptions grOptions = fGlobalOptions;
    if (kUseInstanced_ContextOptions & options) {
        grOptions.fEnableInstancedRendering = true;
    }
    grCtx.reset(GrContext::Create(backend, backendContext, grOptions));
    if (!grCtx.get()) {
        return ContextInfo();
    }
    if (kEnableNVPR_ContextOptions & options) {
        if (!grCtx->caps()->shaderCaps()->pathRenderingSupport()) {
            return ContextInfo();
        }
    }
    if (kUseInstanced_ContextOptions & options) {
        if (GrCaps::InstancedSupport::kNone == grCtx->caps()->instancedSupport()) {
            return ContextInfo();
        }
    }
    if (kRequireSRGBSupport_ContextOptions & options) {
        if (!grCtx->caps()->srgbSupport()) {
            return ContextInfo();
        }
    }

    Context& context = fContexts.push_back();
    context.fBackend = backend;
    context.fTestContext = testCtx.release();
    context.fGrContext = SkRef(grCtx.get());
    context.fType = type;
    context.fOptions = options;
    context.fAbandoned = false;
    return ContextInfo(context.fBackend, context.fTestContext, context.fGrContext);
}
Exemplo n.º 12
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bool GrGpuGL::programUnitTest(int maxStages) {

    GrTextureDesc dummyDesc;
    dummyDesc.fFlags = kRenderTarget_GrTextureFlagBit;
    dummyDesc.fConfig = kSkia8888_GrPixelConfig;
    dummyDesc.fWidth = 34;
    dummyDesc.fHeight = 18;
    SkAutoTUnref<GrTexture> dummyTexture1(this->createTexture(dummyDesc, NULL, 0));
    dummyDesc.fFlags = kNone_GrTextureFlags;
    dummyDesc.fConfig = kAlpha_8_GrPixelConfig;
    dummyDesc.fWidth = 16;
    dummyDesc.fHeight = 22;
    SkAutoTUnref<GrTexture> dummyTexture2(this->createTexture(dummyDesc, NULL, 0));

    if (!dummyTexture1 || ! dummyTexture2) {
        return false;
    }

    static const int NUM_TESTS = 512;

    SkRandom random;
    for (int t = 0; t < NUM_TESTS; ++t) {

#if 0
        GrPrintf("\nTest Program %d\n-------------\n", t);
        static const int stop = -1;
        if (t == stop) {
            int breakpointhere = 9;
        }
#endif

        GrGLProgramDesc pdesc;

        int currAttribIndex = 1;  // we need to always leave room for position
        int currTextureCoordSet = 0;
        GrTexture* dummyTextures[] = {dummyTexture1.get(), dummyTexture2.get()};

        int numStages = random.nextULessThan(maxStages + 1);
        int numColorStages = random.nextULessThan(numStages + 1);
        int numCoverageStages = numStages - numColorStages;

        SkAutoSTMalloc<8, const GrFragmentStage*> stages(numStages);

        bool usePathRendering = this->glCaps().pathRenderingSupport() && random.nextBool();

        GrGpu::DrawType drawType = usePathRendering ? GrGpu::kDrawPath_DrawType :
                                                      GrGpu::kDrawPoints_DrawType;

        SkAutoTDelete<GrGeometryStage> geometryProcessor;
        bool hasGeometryProcessor = usePathRendering ? false : random.nextBool();
        if (hasGeometryProcessor) {
            while (true) {
                SkAutoTUnref<const GrGeometryProcessor> effect(
                        GrProcessorTestFactory<GrGeometryProcessor>::CreateStage(&random, this->getContext(), *this->caps(),
                                                         dummyTextures));
                SkASSERT(effect);
                // Only geometryProcessor can use vertex shader
                GrGeometryStage* stage = SkNEW_ARGS(GrGeometryStage, (effect.get()));
                geometryProcessor.reset(stage);

                // we have to set dummy vertex attribs
                const GrGeometryProcessor::VertexAttribArray& v = effect->getVertexAttribs();
                int numVertexAttribs = v.count();

                SkASSERT(GrGeometryProcessor::kMaxVertexAttribs == 2 &&
                         GrGeometryProcessor::kMaxVertexAttribs >= numVertexAttribs);
                size_t runningStride = GrVertexAttribTypeSize(genericVertexAttribs[0].fType);
                for (int i = 0; i < numVertexAttribs; i++) {
                    genericVertexAttribs[i + 1].fOffset = runningStride;
                    genericVertexAttribs[i + 1].fType =
                            convert_sltype_to_attribtype(v[i].getType());
                    runningStride += GrVertexAttribTypeSize(genericVertexAttribs[i + 1].fType);
                }

                // update the vertex attributes with the ds
                GrDrawState* ds = this->drawState();
                ds->setVertexAttribs<genericVertexAttribs>(numVertexAttribs + 1, runningStride);
                currAttribIndex = numVertexAttribs + 1;
                break;
            }
        }
        for (int s = 0; s < numStages;) {
            SkAutoTUnref<const GrFragmentProcessor> effect(
                    GrProcessorTestFactory<GrFragmentProcessor>::CreateStage(
                                                                            &random,
                                                                            this->getContext(),
                                                                            *this->caps(),
                                                                            dummyTextures));
            SkASSERT(effect);

            // If adding this effect would exceed the max texture coord set count then generate a
            // new random effect.
            if (usePathRendering && this->glPathRendering()->texturingMode() ==
                                    GrGLPathRendering::FixedFunction_TexturingMode) {;
                int numTransforms = effect->numTransforms();
                if (currTextureCoordSet + numTransforms > this->glCaps().maxFixedFunctionTextureCoords()) {
                    continue;
                }
                currTextureCoordSet += numTransforms;
            }
            GrFragmentStage* stage = SkNEW_ARGS(GrFragmentStage, (effect.get()));

            stages[s] = stage;
            ++s;
        }
        const GrTexture* dstTexture = random.nextBool() ? dummyTextures[0] : dummyTextures[1];
        if (!pdesc.setRandom(&random,
                             this,
                             dummyTextures[0]->asRenderTarget(),
                             dstTexture,
                             geometryProcessor.get(),
                             stages.get(),
                             numColorStages,
                             numCoverageStages,
                             currAttribIndex,
                             drawType)) {
            return false;
        }

        SkAutoTUnref<GrOptDrawState> optState(GrOptDrawState::Create(this->getDrawState(),
                                                                     *this->caps(),
                                                                     drawType));
        SkAutoTUnref<GrGLProgram> program(
                        GrGLProgramBuilder::CreateProgram(*optState,
                                                          pdesc,
                                                          drawType,
                                                          geometryProcessor,
                                                          stages,
                                                          stages + numColorStages,
                                                          this));
        for (int s = 0; s < numStages; ++s) {
            SkDELETE(stages[s]);
        }
        if (NULL == program.get()) {
            return false;
        }

        // We have to reset the drawstate because we might have added a gp
        this->drawState()->reset();
    }
    return true;
}
Exemplo n.º 13
0
int tool_main(int argc, char** argv) {
    SetupCrashHandler();
    SkCommandLineFlags::Parse(argc, argv);
#if SK_ENABLE_INST_COUNT
    if (FLAGS_leaks) {
        gPrintInstCount = true;
    }
#endif
    SkAutoGraphics ag;

    // First, parse some flags.
    BenchLogger logger;
    if (FLAGS_logFile.count()) {
        logger.SetLogFile(FLAGS_logFile[0]);
    }

    LoggerResultsWriter logWriter(logger, FLAGS_timeFormat[0]);
    MultiResultsWriter writer;
    writer.add(&logWriter);

    SkAutoTDelete<JSONResultsWriter> jsonWriter;
    if (FLAGS_outResultsFile.count()) {
        jsonWriter.reset(SkNEW(JSONResultsWriter(FLAGS_outResultsFile[0])));
        writer.add(jsonWriter.get());
    }

    // Instantiate after all the writers have been added to writer so that we
    // call close() before their destructors are called on the way out.
    CallEnd<MultiResultsWriter> ender(writer);

    const uint8_t alpha = FLAGS_forceBlend ? 0x80 : 0xFF;
    SkTriState::State dither = SkTriState::kDefault;
    for (size_t i = 0; i < 3; i++) {
        if (strcmp(SkTriState::Name[i], FLAGS_forceDither[0]) == 0) {
            dither = static_cast<SkTriState::State>(i);
        }
    }

    BenchMode benchMode = kNormal_BenchMode;
    for (size_t i = 0; i < SK_ARRAY_COUNT(BenchMode_Name); i++) {
        if (strcmp(FLAGS_mode[0], BenchMode_Name[i]) == 0) {
            benchMode = static_cast<BenchMode>(i);
        }
    }

    SkTDArray<int> configs;
    bool runDefaultConfigs = false;
    // Try user-given configs first.
    for (int i = 0; i < FLAGS_config.count(); i++) {
        for (int j = 0; j < static_cast<int>(SK_ARRAY_COUNT(gConfigs)); ++j) {
            if (0 == strcmp(FLAGS_config[i], gConfigs[j].name)) {
                *configs.append() = j;
            } else if (0 == strcmp(FLAGS_config[i], kDefaultsConfigStr)) {
                runDefaultConfigs = true;
            }
        }
    }
    // If there weren't any, fill in with defaults.
    if (runDefaultConfigs) {
        for (int i = 0; i < static_cast<int>(SK_ARRAY_COUNT(gConfigs)); ++i) {
            if (gConfigs[i].runByDefault) {
                *configs.append() = i;
            }
        }
    }
    // Filter out things we can't run.
    if (kNormal_BenchMode != benchMode) {
        // Non-rendering configs only run in normal mode
        for (int i = 0; i < configs.count(); ++i) {
            const Config& config = gConfigs[configs[i]];
            if (Benchmark::kNonRendering_Backend == config.backend) {
                configs.remove(i, 1);
                --i;
            }
        }
    }

#if SK_SUPPORT_GPU
    for (int i = 0; i < configs.count(); ++i) {
        const Config& config = gConfigs[configs[i]];

        if (Benchmark::kGPU_Backend == config.backend) {
            GrContext* context = gContextFactory.get(config.contextType);
            if (NULL == context) {
                SkDebugf("GrContext could not be created for config %s. Config will be skipped.\n",
                    config.name);
                configs.remove(i);
                --i;
                continue;
            }
            if (config.sampleCount > context->getMaxSampleCount()){
                SkDebugf(
                    "Sample count (%d) for config %s is not supported. Config will be skipped.\n",
                    config.sampleCount, config.name);
                configs.remove(i);
                --i;
                continue;
            }
        }
    }
#endif

    // All flags should be parsed now.  Report our settings.
    if (FLAGS_runOnce) {
        logger.logError("bench was run with --runOnce, so we're going to hide the times."
                        " It's for your own good!\n");
    }
    writer.option("mode", FLAGS_mode[0]);
    writer.option("alpha", SkStringPrintf("0x%02X", alpha).c_str());
    writer.option("antialias", SkStringPrintf("%d", FLAGS_forceAA).c_str());
    writer.option("filter", SkStringPrintf("%d", FLAGS_forceFilter).c_str());
    writer.option("dither",  SkTriState::Name[dither]);

    writer.option("rotate", SkStringPrintf("%d", FLAGS_rotate).c_str());
    writer.option("scale", SkStringPrintf("%d", FLAGS_scale).c_str());
    writer.option("clip", SkStringPrintf("%d", FLAGS_clip).c_str());

#if defined(SK_BUILD_FOR_WIN32)
    writer.option("system", "WIN32");
#elif defined(SK_BUILD_FOR_MAC)
    writer.option("system", "MAC");
#elif defined(SK_BUILD_FOR_ANDROID)
    writer.option("system", "ANDROID");
#elif defined(SK_BUILD_FOR_UNIX)
    writer.option("system", "UNIX");
#else
    writer.option("system", "other");
#endif

#if defined(SK_DEBUG)
    writer.option("build", "DEBUG");
#else
    writer.option("build", "RELEASE");
#endif

    // Set texture cache limits if non-default.
    for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); ++i) {
#if SK_SUPPORT_GPU
        const Config& config = gConfigs[i];
        if (Benchmark::kGPU_Backend != config.backend) {
            continue;
        }
        GrContext* context = gContextFactory.get(config.contextType);
        if (NULL == context) {
            continue;
        }

        size_t bytes;
        int count;
        context->getResourceCacheLimits(&count, &bytes);
        if (-1 != FLAGS_gpuCacheBytes) {
            bytes = static_cast<size_t>(FLAGS_gpuCacheBytes);
        }
        if (-1 != FLAGS_gpuCacheCount) {
            count = FLAGS_gpuCacheCount;
        }
        context->setResourceCacheLimits(count, bytes);
#endif
    }

    // Run each bench in each configuration it supports and we asked for.
    Iter iter;
    Benchmark* bench;
    while ((bench = iter.next()) != NULL) {
        SkAutoTUnref<Benchmark> benchUnref(bench);
        if (SkCommandLineFlags::ShouldSkip(FLAGS_match, bench->getName())) {
            continue;
        }

        bench->setForceAlpha(alpha);
        bench->setForceAA(FLAGS_forceAA);
        bench->setForceFilter(FLAGS_forceFilter);
        bench->setDither(dither);
        bench->preDraw();

        bool loggedBenchName = false;
        for (int i = 0; i < configs.count(); ++i) {
            const int configIndex = configs[i];
            const Config& config = gConfigs[configIndex];

            if (!bench->isSuitableFor(config.backend)) {
                continue;
            }

            GrContext* context = NULL;
#if SK_SUPPORT_GPU
            SkGLContextHelper* glContext = NULL;
            if (Benchmark::kGPU_Backend == config.backend) {
                context = gContextFactory.get(config.contextType);
                if (NULL == context) {
                    continue;
                }
                glContext = gContextFactory.getGLContext(config.contextType);
            }
#endif

            SkAutoTUnref<SkCanvas> canvas;
            SkAutoTUnref<SkPicture> recordFrom;
            SkPictureRecorder recorderTo;
            const SkIPoint dim = bench->getSize();

            SkAutoTUnref<SkSurface> surface;
            if (Benchmark::kNonRendering_Backend != config.backend) {
                surface.reset(make_surface(config.fColorType,
                                           dim,
                                           config.backend,
                                           config.sampleCount,
                                           context));
                if (!surface.get()) {
                    logger.logError(SkStringPrintf(
                        "Device creation failure for config %s. Will skip.\n", config.name));
                    continue;
                }

                switch(benchMode) {
                    case kDeferredSilent_BenchMode:
                    case kDeferred_BenchMode:
                        canvas.reset(SkDeferredCanvas::Create(surface.get()));
                        break;
                    case kRecord_BenchMode:
                        canvas.reset(SkRef(recorderTo.beginRecording(dim.fX, dim.fY)));
                        break;
                    case kPictureRecord_BenchMode: {
                        SkPictureRecorder recorderFrom;
                        bench->draw(1, recorderFrom.beginRecording(dim.fX, dim.fY));
                        recordFrom.reset(recorderFrom.endRecording());
                        canvas.reset(SkRef(recorderTo.beginRecording(dim.fX, dim.fY)));
                        break;
                    }
                    case kNormal_BenchMode:
                        canvas.reset(SkRef(surface->getCanvas()));
                        break;
                    default:
                        SkASSERT(false);
                }
            }

            if (NULL != canvas) {
                canvas->clear(SK_ColorWHITE);
                if (FLAGS_clip)   {
                    perform_clip(canvas, dim.fX, dim.fY);
                }
                if (FLAGS_scale)  {
                    perform_scale(canvas, dim.fX, dim.fY);
                }
                if (FLAGS_rotate) {
                    perform_rotate(canvas, dim.fX, dim.fY);
                }
            }

            if (!loggedBenchName) {
                loggedBenchName = true;
                writer.bench(bench->getName(), dim.fX, dim.fY);
            }

#if SK_SUPPORT_GPU
            SkGLContextHelper* contextHelper = NULL;
            if (Benchmark::kGPU_Backend == config.backend) {
                contextHelper = gContextFactory.getGLContext(config.contextType);
            }
            BenchTimer timer(contextHelper);
#else
            BenchTimer timer;
#endif

            double previous = std::numeric_limits<double>::infinity();
            bool converged = false;

            // variables used to compute loopsPerFrame
            double frameIntervalTime = 0.0f;
            int frameIntervalTotalLoops = 0;

            bool frameIntervalComputed = false;
            int loopsPerFrame = 0;
            int loopsPerIter = 0;
            if (FLAGS_verbose) { SkDebugf("%s %s: ", bench->getName(), config.name); }
            if (!FLAGS_dryRun) {
                do {
                    // Ramp up 1 -> 2 -> 4 -> 8 -> 16 -> ... -> ~1 billion.
                    loopsPerIter = (loopsPerIter == 0) ? 1 : loopsPerIter * 2;
                    if (loopsPerIter >= (1<<30) || timer.fWall > FLAGS_maxMs) {
                        // If you find it takes more than a billion loops to get up to 20ms of runtime,
                        // you've got a computer clocked at several THz or have a broken benchmark.  ;)
                        //     "1B ought to be enough for anybody."
                        logger.logError(SkStringPrintf(
                            "\nCan't get %s %s to converge in %dms (%d loops)",
                             bench->getName(), config.name, FLAGS_maxMs, loopsPerIter));
                        break;
                    }

                    if ((benchMode == kRecord_BenchMode || benchMode == kPictureRecord_BenchMode)) {
                        // Clear the recorded commands so that they do not accumulate.
                        canvas.reset(SkRef(recorderTo.beginRecording(dim.fX, dim.fY)));
                    }

                    timer.start();
                    // Inner loop that allows us to break the run into smaller
                    // chunks (e.g. frames). This is especially useful for the GPU
                    // as we can flush and/or swap buffers to keep the GPU from
                    // queuing up too much work.
                    for (int loopCount = loopsPerIter; loopCount > 0; ) {
                        // Save and restore around each call to draw() to guarantee a pristine canvas.
                        SkAutoCanvasRestore saveRestore(canvas, true/*also save*/);

                        int loops;
                        if (frameIntervalComputed && loopCount > loopsPerFrame) {
                            loops = loopsPerFrame;
                            loopCount -= loopsPerFrame;
                        } else {
                            loops = loopCount;
                            loopCount = 0;
                        }

                        if (benchMode == kPictureRecord_BenchMode) {
                            recordFrom->draw(canvas);
                        } else {
                            bench->draw(loops, canvas);
                        }

                        if (kDeferredSilent_BenchMode == benchMode) {
                            static_cast<SkDeferredCanvas*>(canvas.get())->silentFlush();
                        } else if (NULL != canvas) {
                            canvas->flush();
                        }

    #if SK_SUPPORT_GPU
                        // swap drawing buffers on each frame to prevent the GPU
                        // from queuing up too much work
                        if (NULL != glContext) {
                            glContext->swapBuffers();
                        }
    #endif
                    }



                    // Stop truncated timers before GL calls complete, and stop the full timers after.
                    timer.truncatedEnd();
    #if SK_SUPPORT_GPU
                    if (NULL != glContext) {
                        context->flush();
                        SK_GL(*glContext, Finish());
                    }
    #endif
                    timer.end();

                    // setup the frame interval for subsequent iterations
                    if (!frameIntervalComputed) {
                        frameIntervalTime += timer.fWall;
                        frameIntervalTotalLoops += loopsPerIter;
                        if (frameIntervalTime >= FLAGS_minMs) {
                            frameIntervalComputed = true;
                            loopsPerFrame =
                              (int)(((double)frameIntervalTotalLoops / frameIntervalTime) * FLAGS_minMs);
                            if (loopsPerFrame < 1) {
                                loopsPerFrame = 1;
                            }
    //                        SkDebugf("  %s has %d loops in %f ms (normalized to %d)\n",
    //                                 bench->getName(), frameIntervalTotalLoops,
    //                                 timer.fWall, loopsPerFrame);
                        }
                    }

                    const double current = timer.fWall / loopsPerIter;
                    if (FLAGS_verbose && current > previous) { SkDebugf("↑"); }
                    if (FLAGS_verbose) { SkDebugf("%.3g ", current); }
                    converged = HasConverged(previous, current, timer.fWall);
                    previous = current;
                } while (!FLAGS_runOnce && !converged);
            }
            if (FLAGS_verbose) { SkDebugf("\n"); }

            if (!FLAGS_dryRun && FLAGS_outDir.count() && Benchmark::kNonRendering_Backend != config.backend) {
                SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
                if (image.get()) {
                    saveFile(bench->getName(), config.name, FLAGS_outDir[0],
                             image);
                }
            }

            if (FLAGS_runOnce) {
                // Let's not mislead ourselves by looking at Debug build or single iteration bench times!
                continue;
            }

            // Normalize to ms per 1000 iterations.
            const double normalize = 1000.0 / loopsPerIter;
            const struct { char shortName; const char* longName; double ms; } times[] = {
                {'w', "msecs",  normalize * timer.fWall},
                {'W', "Wmsecs", normalize * timer.fTruncatedWall},
                {'c', "cmsecs", normalize * timer.fCpu},
                {'C', "Cmsecs", normalize * timer.fTruncatedCpu},
                {'g', "gmsecs", normalize * timer.fGpu},
            };

            writer.config(config.name);
            for (size_t i = 0; i < SK_ARRAY_COUNT(times); i++) {
                if (strchr(FLAGS_timers[0], times[i].shortName) && times[i].ms > 0) {
                    writer.timer(times[i].longName, times[i].ms);
                }
            }
        }
    }
#if SK_SUPPORT_GPU
    gContextFactory.destroyContexts();
#endif
    return 0;
}
Exemplo n.º 14
0
void GrDrawTarget::drawBatches(GrBatchFlushState* flushState) {
    // Draw all the generated geometry.
    SkRandom random;
    GrRenderTarget* currentRT = nullptr;
    SkAutoTDelete<GrGpuCommandBuffer> commandBuffer;
    SkRect bounds = SkRect::MakeEmpty();
    for (int i = 0; i < fBatches.count(); ++i) {
        if (!fBatches[i]) {
            continue;
        }
        if (fBatches[i]->renderTarget() != currentRT) {
            if (commandBuffer) {
                commandBuffer->end();
                if (bounds.intersect(0, 0,
                                     SkIntToScalar(currentRT->width()),
                                     SkIntToScalar(currentRT->height()))) {
                    SkIRect iBounds;
                    bounds.roundOut(&iBounds);
                    commandBuffer->submit(iBounds);
                }
                commandBuffer.reset();
            }
            bounds.setEmpty();
            currentRT = fBatches[i]->renderTarget();
            if (currentRT) {
                static const GrGpuCommandBuffer::LoadAndStoreInfo kBasicLoadStoreInfo
                    { GrGpuCommandBuffer::LoadOp::kLoad,GrGpuCommandBuffer::StoreOp::kStore,
                      GrColor_ILLEGAL };
                commandBuffer.reset(fGpu->createCommandBuffer(currentRT,
                                                              kBasicLoadStoreInfo,   // Color
                                                              kBasicLoadStoreInfo)); // Stencil
            }
            flushState->setCommandBuffer(commandBuffer);
        }
        if (commandBuffer) {
            bounds.join(fBatches[i]->bounds());
        }
        if (fDrawBatchBounds) {
            const SkRect& batchBounds = fBatches[i]->bounds();
            SkIRect iBatchBounds;
            batchBounds.roundOut(&iBatchBounds);
            // In multi-draw buffer all the batches use the same render target and we won't need to
            // get the batchs bounds.
            if (GrRenderTarget* rt = fBatches[i]->renderTarget()) {
                fGpu->drawDebugWireRect(rt, iBatchBounds, 0xFF000000 | random.nextU());
            }
        }
        fBatches[i]->draw(flushState);
    }
    if (commandBuffer) {
        commandBuffer->end();
        if (bounds.intersect(0, 0,
                             SkIntToScalar(currentRT->width()),
                             SkIntToScalar(currentRT->height()))) {
            SkIRect iBounds;
            bounds.roundOut(&iBounds);
            commandBuffer->submit(iBounds);
        }
        flushState->setCommandBuffer(nullptr);
    }

    fGpu->finishDrawTarget();
}
Exemplo n.º 15
0
ContextInfo GrContextFactory::getContextInfo(ContextType type, ContextOptions options) {
    for (int i = 0; i < fContexts.count(); ++i) {
        Context& context = fContexts[i];
        if (context.fType == type &&
            context.fOptions == options &&
            !context.fAbandoned) {
            if (context.fGLContext) {
                context.fGLContext->makeCurrent();
            }
            return ContextInfo(context.fGrContext, context.fGLContext);
        }
    }
    SkAutoTDelete<GLTestContext> glCtx;
    sk_sp<GrContext> grCtx;
    GrBackendContext backendContext = 0;
    sk_sp<const GrGLInterface> glInterface;
#ifdef SK_VULKAN
    sk_sp<const GrVkBackendContext> vkBackend;
#endif
    GrBackend backend = ContextTypeBackend(type);
    switch (backend) {
        case kOpenGL_GrBackend:
            switch (type) {
                case kGL_ContextType:
                    glCtx.reset(CreatePlatformGLTestContext(kGL_GrGLStandard));
                    break;
                case kGLES_ContextType:
                    glCtx.reset(CreatePlatformGLTestContext(kGLES_GrGLStandard));
                    break;
#if SK_ANGLE
#   ifdef SK_BUILD_FOR_WIN
                case kANGLE_ContextType:
                    glCtx.reset(CreateANGLEDirect3DGLTestContext());
                    break;
#   endif
                case kANGLE_GL_ContextType:
                    glCtx.reset(CreateANGLEOpenGLGLTestContext());
                    break;
#endif
#if SK_COMMAND_BUFFER
                case kCommandBuffer_ContextType:
                    glCtx.reset(CommandBufferGLTestContext::Create());
                    break;
#endif
#if SK_MESA
                case kMESA_ContextType:
                    glCtx.reset(CreateMesaGLTestContext());
                    break;
#endif
                case kNullGL_ContextType:
                    glCtx.reset(CreateNullGLTestContext());
                    break;
                case kDebugGL_ContextType:
                    glCtx.reset(CreateDebugGLTestContext());
                    break;
                default:
                    return ContextInfo();
            }
            if (nullptr == glCtx.get()) {
                return ContextInfo();
            }
            glInterface.reset(SkRef(glCtx->gl()));
            // Block NVPR from non-NVPR types.
            if (!(kEnableNVPR_ContextOptions & options)) {
                glInterface.reset(GrGLInterfaceRemoveNVPR(glInterface.get()));
                if (!glInterface) {
                    return ContextInfo();
                }
            }
            backendContext = reinterpret_cast<GrBackendContext>(glInterface.get());
            glCtx->makeCurrent();
            break;
#ifdef SK_VULKAN
        case kVulkan_GrBackend:
            SkASSERT(kVulkan_ContextType == type);
            if ((kEnableNVPR_ContextOptions & options) ||
                (kRequireSRGBSupport_ContextOptions & options)) {
                return ContextInfo();
            }
            vkBackend.reset(GrVkBackendContext::Create());
            if (!vkBackend) {
                return ContextInfo();
            }
            backendContext = reinterpret_cast<GrBackendContext>(vkBackend.get());
            // There is some bug (either in Skia or the NV Vulkan driver) where VkDevice
            // destruction will hang occaisonally. For some reason having an existing GL
            // context fixes this.
            if (!fSentinelGLContext) {
                fSentinelGLContext.reset(CreatePlatformGLTestContext(kGL_GrGLStandard));
                if (!fSentinelGLContext) {
                    fSentinelGLContext.reset(CreatePlatformGLTestContext(kGLES_GrGLStandard));
                }
            }
            break;
#endif
        default:
            return ContextInfo();
    }

    grCtx.reset(GrContext::Create(backend, backendContext, fGlobalOptions));
    if (!grCtx.get()) {
        return ContextInfo();
    }
    if (kEnableNVPR_ContextOptions & options) {
        if (!grCtx->caps()->shaderCaps()->pathRenderingSupport()) {
            return ContextInfo();
        }
    }
    if (kRequireSRGBSupport_ContextOptions & options) {
        if (!grCtx->caps()->srgbSupport()) {
            return ContextInfo();
        }
    }

    Context& context = fContexts.push_back();
    context.fGLContext = glCtx.release();
    context.fGrContext = SkRef(grCtx.get());
    context.fType = type;
    context.fOptions = options;
    context.fAbandoned = false;
    return ContextInfo(context.fGrContext, context.fGLContext);
}
Exemplo n.º 16
0
int tool_main(int argc, char** argv) {
    SetupCrashHandler();
    SkString usage;
    usage.printf("Time drawing .skp files.\n"
                 "\tPossible arguments for --filter: [%s]\n\t\t[%s]",
                 filterTypesUsage().c_str(), filterFlagsUsage().c_str());
    SkCommandLineFlags::SetUsage(usage.c_str());
    SkCommandLineFlags::Parse(argc, argv);

    if (FLAGS_repeat < 1) {
        SkString error;
        error.printf("--repeats must be >= 1. Was %i\n", FLAGS_repeat);
        gLogger.logError(error);
        exit(-1);
    }

    if (FLAGS_logFile.count() == 1) {
        if (!gLogger.SetLogFile(FLAGS_logFile[0])) {
            SkString str;
            str.printf("Could not open %s for writing.\n", FLAGS_logFile[0]);
            gLogger.logError(str);
            // TODO(borenet): We're disabling this for now, due to
            // write-protected Android devices.  The very short-term
            // solution is to ignore the fact that we have no log file.
            //exit(-1);
        }
    }

    SkAutoTDelete<PictureJSONResultsWriter> jsonWriter;
    if (FLAGS_jsonLog.count() == 1) {
        SkASSERT(FLAGS_builderName.count() == 1 && FLAGS_gitHash.count() == 1);
        jsonWriter.reset(SkNEW(PictureJSONResultsWriter(
                        FLAGS_jsonLog[0],
                        FLAGS_builderName[0],
                        FLAGS_buildNumber,
                        FLAGS_timestamp,
                        FLAGS_gitHash[0],
                        FLAGS_gitNumber)));
        gWriter.add(jsonWriter.get());
    }

    gWriter.add(&gLogWriter);


#if SK_ENABLE_INST_COUNT
    gPrintInstCount = true;
#endif
    SkAutoGraphics ag;

    sk_tools::PictureBenchmark benchmark;

    setup_benchmark(&benchmark);

    int failures = 0;
    for (int i = 0; i < FLAGS_readPath.count(); ++i) {
        failures += process_input(FLAGS_readPath[i], benchmark);
    }

    if (failures != 0) {
        SkString err;
        err.printf("Failed to run %i benchmarks.\n", failures);
        gLogger.logError(err);
        return 1;
    }
#if SK_LAZY_CACHE_STATS
    if (FLAGS_trackDeferredCaching) {
        SkDebugf("Total cache hit rate: %f\n",
                 (double) gTotalCacheHits / (gTotalCacheHits + gTotalCacheMisses));
    }
#endif
    gWriter.end();
    return 0;
}
/*
 * nine patch not supported
 *
 * purgeable not supported
 * reportSizeToVM not supported
 */
static jobject nativeDecodeRegion(JNIEnv* env, jobject, jlong brdHandle,
                                jint start_x, jint start_y, jint width, jint height, jobject options) {
    SkBitmapRegionDecoder *brd = reinterpret_cast<SkBitmapRegionDecoder*>(brdHandle);
    jobject tileBitmap = NULL;
    SkImageDecoder *decoder = brd->getDecoder();
    int sampleSize = 1;
    SkColorType prefColorType = kUnknown_SkColorType;
    bool doDither = true;
    bool preferQualityOverSpeed = false;
    bool requireUnpremultiplied = false;

    if (NULL != options) {
        sampleSize = env->GetIntField(options, gOptions_sampleSizeFieldID);
        // initialize these, in case we fail later on
        env->SetIntField(options, gOptions_widthFieldID, -1);
        env->SetIntField(options, gOptions_heightFieldID, -1);
        env->SetObjectField(options, gOptions_mimeFieldID, 0);

        jobject jconfig = env->GetObjectField(options, gOptions_configFieldID);
        prefColorType = GraphicsJNI::getNativeBitmapColorType(env, jconfig);
        doDither = env->GetBooleanField(options, gOptions_ditherFieldID);
        preferQualityOverSpeed = env->GetBooleanField(options,
                gOptions_preferQualityOverSpeedFieldID);
        // Get the bitmap for re-use if it exists.
        tileBitmap = env->GetObjectField(options, gOptions_bitmapFieldID);
        requireUnpremultiplied = !env->GetBooleanField(options, gOptions_premultipliedFieldID);
    }

    decoder->setDitherImage(doDither);
    decoder->setPreferQualityOverSpeed(preferQualityOverSpeed);
    decoder->setRequireUnpremultipliedColors(requireUnpremultiplied);
    AutoDecoderCancel adc(options, decoder);

    // To fix the race condition in case "requestCancelDecode"
    // happens earlier than AutoDecoderCancel object is added
    // to the gAutoDecoderCancelMutex linked list.
    if (NULL != options && env->GetBooleanField(options, gOptions_mCancelID)) {
        return nullObjectReturn("gOptions_mCancelID");;
    }

    SkIRect region;
    region.fLeft = start_x;
    region.fTop = start_y;
    region.fRight = start_x + width;
    region.fBottom = start_y + height;
    SkBitmap* bitmap = NULL;
    SkAutoTDelete<SkBitmap> adb;

    if (tileBitmap != NULL) {
        // Re-use bitmap.
        bitmap = GraphicsJNI::getNativeBitmap(env, tileBitmap);
    }
    if (bitmap == NULL) {
        bitmap = new SkBitmap;
        adb.reset(bitmap);
    }

    if (!brd->decodeRegion(bitmap, region, prefColorType, sampleSize)) {
        return nullObjectReturn("decoder->decodeRegion returned false");
    }

    // update options (if any)
    if (NULL != options) {
        env->SetIntField(options, gOptions_widthFieldID, bitmap->width());
        env->SetIntField(options, gOptions_heightFieldID, bitmap->height());
        // TODO: set the mimeType field with the data from the codec.
        // but how to reuse a set of strings, rather than allocating new one
        // each time?
        env->SetObjectField(options, gOptions_mimeFieldID,
                            getMimeTypeString(env, decoder->getFormat()));
    }

    if (tileBitmap != NULL) {
        return tileBitmap;
    }

    // detach bitmap from its autodeleter, since we want to own it now
    adb.detach();

    JavaPixelAllocator* allocator = (JavaPixelAllocator*) decoder->getAllocator();
    jbyteArray buff = allocator->getStorageObjAndReset();

    int bitmapCreateFlags = 0;
    if (!requireUnpremultiplied) bitmapCreateFlags |= GraphicsJNI::kBitmapCreateFlag_Premultiplied;
    return GraphicsJNI::createBitmap(env, bitmap, buff, bitmapCreateFlags, NULL, NULL, -1);
}