C++ GrContext类代码示例

DEF_GPUTEST(TessellatingPathRendererTests, reporter, factory) {
    GrContext* context = factory->get(static_cast<GrContextFactory::GLContextType>(0));
    if (nullptr == context) {
        return;
    }
    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = 800;
    desc.fHeight = 800;
    desc.fConfig = kSkia8888_GrPixelConfig;
    desc.fOrigin = kTopLeft_GrSurfaceOrigin;
    SkAutoTUnref<GrTexture> texture(context->textureProvider()->createApproxTexture(desc));
    GrTestTarget tt;
    GrRenderTarget* rt = texture->asRenderTarget();
    context->getTestTarget(&tt, rt);
    GrDrawTarget* dt = tt.target();
    GrResourceProvider* rp = tt.resourceProvider();

    test_path(dt, rt, rp, create_path_0());
    test_path(dt, rt, rp, create_path_1());
    test_path(dt, rt, rp, create_path_2());
    test_path(dt, rt, rp, create_path_3());
    test_path(dt, rt, rp, create_path_4());
    test_path(dt, rt, rp, create_path_5());
    test_path(dt, rt, rp, create_path_6());
    test_path(dt, rt, rp, create_path_7());
    test_path(dt, rt, rp, create_path_8());
    test_path(dt, rt, rp, create_path_9());
    test_path(dt, rt, rp, create_path_10());
    test_path(dt, rt, rp, create_path_11());
    test_path(dt, rt, rp, create_path_12());
    test_path(dt, rt, rp, create_path_13());
    test_path(dt, rt, rp, create_path_14());
    test_path(dt, rt, rp, create_path_15());
}

static SkCanvas* createAcceleratedCanvas(const IntSize& size, ImageBufferData* data, DeferralMode deferralMode)
{
    RefPtr<GraphicsContext3D> context3D = SharedGraphicsContext3D::get();
    if (!context3D)
        return 0;
    GrContext* gr = context3D->grContext();
    if (!gr)
        return 0;
    gr->resetContext();
    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit;
    desc.fSampleCnt = 0;
    desc.fWidth = size.width();
    desc.fHeight = size.height();
    desc.fConfig = kSkia8888_PM_GrPixelConfig;
    SkAutoTUnref<GrTexture> texture(gr->createUncachedTexture(desc, 0, 0));
    if (!texture.get())
        return 0;
    SkCanvas* canvas;
    SkAutoTUnref<SkDevice> device(new SkGpuDevice(gr, texture.get()));
    if (deferralMode == Deferred) {
        SkAutoTUnref<AcceleratedDeviceContext> deviceContext(new AcceleratedDeviceContext(context3D.get()));
        canvas = new SkDeferredCanvas(device.get(), deviceContext.get());
    } else
        canvas = new SkCanvas(device.get());
    data->m_platformContext.setAccelerated(true);
#if USE(ACCELERATED_COMPOSITING)
    data->m_platformLayer = Canvas2DLayerChromium::create(context3D.release(), size);
    data->m_platformLayer->setTextureId(texture.get()->getTextureHandle());
    data->m_platformLayer->setCanvas(canvas);
#endif
    return canvas;
}

bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
                                          SkBitmap* result, SkIPoint* offset) {
    SkBitmap srcBM;
    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &srcBM, offset)) {
        return false;
    }
    GrTexture* srcTexture = srcBM.getTexture();
    GrContext* context = srcTexture->getContext();

    SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth,
                                    srcBM.height() * fScale.fHeight);

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
    desc.fWidth = SkScalarCeilToInt(dstRect.width());
    desc.fHeight = SkScalarCeilToInt(dstRect.height());
    desc.fConfig = kSkia8888_GrPixelConfig;

    GrAutoScratchTexture ast(context, desc);
    SkAutoTUnref<GrTexture> dst(ast.detach());
    if (!dst) {
        return false;
    }
    GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
    GrPaint paint;
    paint.addColorEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->unref();
    SkRect srcRect;
    srcBM.getBounds(&srcRect);
    context->drawRectToRect(paint, dstRect, srcRect);
    return SkImageFilterUtils::WrapTexture(dst, desc.fWidth, desc.fHeight, result);
}

MailboxTextureHolder::MailboxTextureHolder(
    std::unique_ptr<TextureHolder> textureHolder) {
  DCHECK(textureHolder->isSkiaTextureHolder());
  sk_sp<SkImage> image = textureHolder->skImage();
  DCHECK(image);

  gpu::gles2::GLES2Interface* sharedGL = SharedGpuContext::gl();
  GrContext* sharedGrContext = SharedGpuContext::gr();
  if (!sharedGrContext) {
    // Can happen if the context is lost. The SkImage won't be any good now
    // anyway.
    return;
  }
  GLuint imageTextureId =
      skia::GrBackendObjectToGrGLTextureInfo(image->getTextureHandle(true))
          ->fID;
  sharedGL->BindTexture(GL_TEXTURE_2D, imageTextureId);

  sharedGL->GenMailboxCHROMIUM(m_mailbox.name);
  sharedGL->ProduceTextureCHROMIUM(GL_TEXTURE_2D, m_mailbox.name);
  const GLuint64 fenceSync = sharedGL->InsertFenceSyncCHROMIUM();
  sharedGL->Flush();
  sharedGL->GenSyncTokenCHROMIUM(fenceSync, m_syncToken.GetData());

  sharedGL->BindTexture(GL_TEXTURE_2D, 0);
  // We changed bound textures in this function, so reset the GrContext.
  sharedGrContext->resetContext(kTextureBinding_GrGLBackendState);
  m_size = IntSize(image->width(), image->height());
  m_textureId = imageTextureId;
  m_isConvertedFromSkiaTexture = true;
}

static SkCanvas* createAcceleratedCanvas(const IntSize& size, ImageBufferData* data)
{
    RefPtr<GraphicsContext3D> context3D = SharedGraphicsContext3D::get();
    if (!context3D)
        return 0;
    GrContext* gr = context3D->grContext();
    if (!gr)
        return 0;
    gr->resetContext();
    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit;
    desc.fSampleCnt = 0;
    desc.fWidth = size.width();
    desc.fHeight = size.height();
    desc.fConfig = kSkia8888_GrPixelConfig;
    SkAutoTUnref<GrTexture> texture(gr->createUncachedTexture(desc, 0, 0));
    if (!texture.get())
        return 0;
    SkCanvas* canvas;
    SkAutoTUnref<SkDevice> device(new SkGpuDevice(gr, texture.get()));
#if USE(ACCELERATED_COMPOSITING)
    Canvas2DLayerBridge::ThreadMode threadMode = WebKit::Platform::current()->isThreadedCompositingEnabled() ? Canvas2DLayerBridge::Threaded : Canvas2DLayerBridge::SingleThread;
    data->m_layerBridge = Canvas2DLayerBridge::create(context3D.release(), size, threadMode, texture.get()->getTextureHandle());
    canvas = data->m_layerBridge->skCanvas(device.get());
#else
    canvas = new SkCanvas(device.get());
#endif
    data->m_platformContext.setAccelerated(true);
    return canvas;
}

    void onDrawContent(SkCanvas* canvas) override {
        SkPaint paint;
        SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromFile("/skimages/samplefont.ttf")));
        paint.setAntiAlias(true);
        paint.setFilterQuality(kMedium_SkFilterQuality);

        SkString outString("fps: ");
        fTimer.end();

        // TODO: generalize this timing code in utils
        fTimes[fCurrentTime] = (float)(fTimer.fWall);
        fCurrentTime = (fCurrentTime + 1) & 0x1f;

        float meanTime = 0.0f;
        for (int i = 0; i < 32; ++i) {
            meanTime += fTimes[i];
        }
        meanTime /= 32.f;
        SkScalar fps = 1000.f / meanTime;
        outString.appendScalar(fps);
        outString.append(" ms: ");
        outString.appendScalar(meanTime);

        SkString modeString("Text scale: ");
        modeString.appendU32(fSizeScale);
        modeString.append("x");

        fTimer.start();

        canvas->save();

#if SK_SUPPORT_GPU
        SkBaseDevice* device = canvas->getDevice_just_for_deprecated_compatibility_testing();
        GrContext* grContext = canvas->getGrContext();
        if (grContext) {
            GrTexture* tex = grContext->getFontAtlasTexture(GrMaskFormat::kA8_GrMaskFormat);
            reinterpret_cast<SkGpuDevice*>(device)->drawTexture(tex,
                                                       SkRect::MakeXYWH(512, 10, 512, 512), paint);
        }
#endif
        canvas->translate(180, 180);
        canvas->rotate(fRotation);
        canvas->scale(fScale, fScale);
        canvas->translate(-180, -180);

        const char* text = "Hamburgefons";
        size_t length = strlen(text);

        SkScalar y = SkIntToScalar(0);
        for (int i = 12; i <= 26; i++) {
            paint.setTextSize(SkIntToScalar(i*fSizeScale));
            y += paint.getFontSpacing();
            DrawTheText(canvas, text, length, SkIntToScalar(110), y, paint);
        }
        canvas->restore();

        paint.setTextSize(16);
//        canvas->drawText(outString.c_str(), outString.size(), 512.f, 540.f, paint);
        canvas->drawText(modeString.c_str(), modeString.size(), 768.f, 540.f, paint);
    }

// The gradient shader will use the texture strip atlas if it has too many colors. Make sure
// abandoning the context works.
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(TextureStripAtlasManagerGradientTest, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();

    static const SkColor gColors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE,
                                       SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
                                       SK_ColorBLACK };
    static const SkScalar gPos[] = { 0, 0.17f, 0.32f, 0.49f, 0.66f, 0.83f, 1.0f };

    SkPaint p;
    p.setShader(SkGradientShader::MakeTwoPointConical(SkPoint::Make(0, 0),
                                                      1.0f,
                                                      SkPoint::Make(10.0f, 20.0f),
                                                      2.0f,
                                                      gColors,
                                                      gPos,
                                                      7,
                                                      SkTileMode::kClamp));

    SkImageInfo info = SkImageInfo::MakeN32Premul(128, 128);
    auto surface(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, info));
    SkCanvas* canvas = surface->getCanvas();

    SkRect r = SkRect::MakeXYWH(10, 10, 100, 100);

    canvas->drawRect(r, p);

    context->abandonContext();
}

SkData* Request::getJsonBatchList(int n) {
    SkCanvas* canvas = this->getCanvas();
    SkASSERT(fGPUEnabled);

    // TODO if this is inefficient we could add a method to GrAuditTrail which takes
    // a Json::Value and is only compiled in this file
    Json::Value parsedFromString;
#if SK_SUPPORT_GPU
    GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
    SkASSERT(rt);
    GrContext* ctx = rt->getContext();
    SkASSERT(ctx);
    GrAuditTrail* at = ctx->getAuditTrail();
    GrAuditTrail::AutoManageBatchList enable(at);
    
    fDebugCanvas->drawTo(canvas, n);

    Json::Reader reader;
    SkDEBUGCODE(bool parsingSuccessful = )reader.parse(at->toJson(true).c_str(),
                                                       parsedFromString);
    SkASSERT(parsingSuccessful);
#endif

    SkDynamicMemoryWStream stream;
    stream.writeText(Json::FastWriter().write(parsedFromString).c_str());

    return stream.copyToData();
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(SpecialImage_Gpu, reporter, ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    SkBitmap bm = create_bm();

    const GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(bm.info(), *context->caps());

    sk_sp<GrTextureProxy> proxy(GrSurfaceProxy::MakeDeferred(context->resourceProvider(),
                                                             desc, SkBudgeted::kNo,
                                                             bm.getPixels(), bm.rowBytes()));
    if (!proxy) {
        return;
    }

    sk_sp<SkSpecialImage> fullSImg(SkSpecialImage::MakeDeferredFromGpu(
                                                            context,
                                                            SkIRect::MakeWH(kFullSize, kFullSize),
                                                            kNeedNewImageUniqueID_SpecialImage,
                                                            proxy, nullptr));

    const SkIRect& subset = SkIRect::MakeXYWH(kPad, kPad, kSmallerSize, kSmallerSize);

    {
        sk_sp<SkSpecialImage> subSImg1(SkSpecialImage::MakeDeferredFromGpu(
                                                               context, subset,
                                                               kNeedNewImageUniqueID_SpecialImage,
                                                               std::move(proxy), nullptr));
        test_image(subSImg1, reporter, context, true, kPad, kFullSize);
    }

    {
        sk_sp<SkSpecialImage> subSImg2(fullSImg->makeSubset(subset));
        test_image(subSImg2, reporter, context, true, kPad, kFullSize);
    }
}

static const GrGLContext* get_gl_context(SkCanvas* canvas) {
    // This bench exclusively tests GL calls directly
    if (NULL == canvas->getGrContext()) {
        return NULL;
    }
    GrContext* context = canvas->getGrContext();

    GrTestTarget tt;
    context->getTestTarget(&tt);
    if (!tt.target()) {
        SkDebugf("Couldn't get Gr test target.");
        return NULL;
    }

    const GrGLContext* ctx = tt.glContext();
    if (!ctx) {
        SkDebugf("Couldn't get an interface\n");
        return NULL;
    }

    // We only care about gpus with drawArraysInstanced support
    if (!ctx->interface()->fFunctions.fDrawArraysInstanced) {
        return NULL;
    }
    return ctx;
}

static int get_glprograms_max_stages(const sk_gpu_test::ContextInfo& ctxInfo) {
    GrContext* context = ctxInfo.grContext();
    GrGLGpu* gpu = static_cast<GrGLGpu*>(context->contextPriv().getGpu());
    int maxStages = 6;
    if (kGLES_GrGLStandard == gpu->glStandard()) {
    // We've had issues with driver crashes and HW limits being exceeded with many effects on
    // Android devices. We have passes on ARM devices with the default number of stages.
    // TODO When we run ES 3.00 GLSL in more places, test again
#ifdef SK_BUILD_FOR_ANDROID
        if (kARM_GrGLVendor != gpu->ctxInfo().vendor()) {
            maxStages = 1;
        }
#endif
    // On iOS we can exceed the maximum number of varyings. http://skbug.com/6627.
#ifdef SK_BUILD_FOR_IOS
        maxStages = 3;
#endif
    }
    if (ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D9_ES2_ContextType ||
        ctxInfo.type() == sk_gpu_test::GrContextFactory::kANGLE_D3D11_ES2_ContextType) {
        // On Angle D3D we will hit a limit of out variables if we use too many stages.
        maxStages = 3;
    }
    return maxStages;
}

GrTexture* GrTextureAdjuster::refTextureSafeForParams(const GrTextureParams& params,
                                                      SkIPoint* outOffset) {
    GrTexture* texture = this->originalTexture();
    GrContext* context = texture->getContext();
    CopyParams copyParams;
    const SkIRect* contentArea = this->contentAreaOrNull();

    if (contentArea && GrTextureParams::kMipMap_FilterMode == params.filterMode()) {
        // If we generate a MIP chain for texture it will read pixel values from outside the content
        // area.
        copyParams.fWidth = contentArea->width();
        copyParams.fHeight = contentArea->height();
        copyParams.fFilter = GrTextureParams::kBilerp_FilterMode;
    } else if (!context->getGpu()->makeCopyForTextureParams(texture, params, &copyParams)) {
        if (outOffset) {
            if (contentArea) {
                outOffset->set(contentArea->fLeft, contentArea->fRight);
            } else {
                outOffset->set(0, 0);
            }
        }
        return SkRef(texture);
    }

    GrTexture* copy = this->refCopy(copyParams);
    if (copy && outOffset) {
        outOffset->set(0, 0);
    }
    return copy;
}

DEF_GPUTEST(GpuDrawPath, reporter, factory) {
    return;

    for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
        GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);

        GrContext* grContext = factory->get(glType);
        if (NULL == grContext) {
            continue;
        }
        static const int sampleCounts[] = { 0, 4, 16 };

        for (size_t i = 0; i < SK_ARRAY_COUNT(sampleCounts); ++i) {
            const int W = 255;
            const int H = 255;

            GrTextureDesc desc;
            desc.fConfig = kSkia8888_GrPixelConfig;
            desc.fFlags = kRenderTarget_GrTextureFlagBit;
            desc.fWidth = W;
            desc.fHeight = H;
            desc.fSampleCnt = sampleCounts[i];
            SkAutoTUnref<GrTexture> texture(grContext->createUncachedTexture(desc, NULL, 0));
            SkAutoTUnref<SkGpuDevice> device(SkNEW_ARGS(SkGpuDevice, (grContext, texture.get())));
            SkCanvas drawingCanvas(device.get());

            test_drawPathEmpty(reporter, &drawingCanvas);
        }
    }
}

SkImage* SkSurface_Gpu::onNewImageSnapshot(SkBudgeted budgeted, ForceCopyMode forceCopyMode) {
    GrRenderTarget* rt = fDevice->accessRenderTarget();
    SkASSERT(rt);
    GrTexture* tex = rt->asTexture();
    SkAutoTUnref<GrTexture> copy;
    // TODO: Force a copy when the rt is an external resource.
    if (kYes_ForceCopyMode == forceCopyMode || !tex) {
        GrSurfaceDesc desc = fDevice->accessRenderTarget()->desc();
        GrContext* ctx = fDevice->context();
        desc.fFlags = desc.fFlags & ~kRenderTarget_GrSurfaceFlag;
        copy.reset(ctx->textureProvider()->createTexture(desc, budgeted));
        if (!copy) {
            return nullptr;
        }
        if (!ctx->copySurface(copy, rt)) {
            return nullptr;
        }
        tex = copy;
    }
    const SkImageInfo info = fDevice->imageInfo();
    SkImage* image = nullptr;
    if (tex) {
        image = new SkImage_Gpu(info.width(), info.height(), kNeedNewImageUniqueID,
                                info.alphaType(), tex, budgeted);
    }
    return image;
}

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