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Commit b24258c1 authored by Derek Sollenberger's avatar Derek Sollenberger
Browse files

Do not map protected buffers to GPU resources and cache the result 

This is in line with the older version of RenderEngine and prevents
the device from exhausting its limited protected GPU memory on cached
objects.

This CL also ensures that upon switching to/from a protected context
that the Skia GPU state is properly initialized and any scratch
resources that were being held onto are purged.

Test: atest com.google.android.media.gts.WidevineDashPolicyTests
Bug: 186158883
Bug: 183391755
Change-Id: I31c03a7589feea6f5d2eb244f77b934e1868326d
parent f938c300

libs/renderengine/skia/SkiaGLRenderEngine.cpp

+37 −18
Original line number Diff line number Diff line
@@ -366,6 +366,10 @@ bool SkiaGLRenderEngine::supportsProtectedContent() const { 
    return mProtectedEGLContext != EGL_NO_CONTEXT;

}



GrDirectContext* SkiaGLRenderEngine::getActiveGrContext() const {

    return mInProtectedContext ? mProtectedGrContext.get() : mGrContext.get();

}



bool SkiaGLRenderEngine::useProtectedContext(bool useProtectedContext) {

    if (useProtectedContext == mInProtectedContext) {

        return true;
@@ -373,6 +377,12 @@ bool SkiaGLRenderEngine::useProtectedContext(bool useProtectedContext) { 
    if (useProtectedContext && !supportsProtectedContent()) {

        return false;

    }



    // release any scratch resources before switching into a new mode

    if (getActiveGrContext()) {

        getActiveGrContext()->purgeUnlockedResources(true);

    }



    const EGLSurface surface =

            useProtectedContext ? mProtectedPlaceholderSurface : mPlaceholderSurface;

    const EGLContext context = useProtectedContext ? mProtectedEGLContext : mEGLContext;
@@ -380,6 +390,11 @@ bool SkiaGLRenderEngine::useProtectedContext(bool useProtectedContext) { 


    if (success) {

        mInProtectedContext = useProtectedContext;

        // given that we are sharing the same thread between two GrContexts we need to

        // make sure that the thread state is reset when switching between the two.

        if (getActiveGrContext()) {

            getActiveGrContext()->resetContext();

        }

    }

    return success;

}
@@ -490,18 +505,23 @@ void SkiaGLRenderEngine::mapExternalTextureBuffer(const sp<GraphicBuffer>& buffe 
    if (mRenderEngineType != RenderEngineType::SKIA_GL_THREADED) {

        return;

    }

    // we currently don't attempt to map a buffer if the buffer contains protected content

    // because GPU resources for protected buffers is much more limited.

    const bool isProtectedBuffer = buffer->getUsage() & GRALLOC_USAGE_PROTECTED;

    if (isProtectedBuffer) {

        return;

    }

    ATRACE_CALL();



    // We need to switch the currently bound context if the buffer is protected but the current

    // context is not. The current state must then be restored after the buffer is cached.

    const bool protectedContextState = mInProtectedContext;

    if (!useProtectedContext(protectedContextState ||

                             (buffer->getUsage() & GRALLOC_USAGE_PROTECTED))) {

    if (!useProtectedContext(protectedContextState || isProtectedBuffer)) {

        ALOGE("Attempting to cache a buffer into a different context than what is currently bound");

        return;

    }



    auto grContext = mInProtectedContext ? mProtectedGrContext : mGrContext;

    auto grContext = getActiveGrContext();

    auto& cache = mInProtectedContext ? mProtectedTextureCache : mTextureCache;



    std::lock_guard<std::mutex> lock(mRenderingMutex);
@@ -509,7 +529,7 @@ void SkiaGLRenderEngine::mapExternalTextureBuffer(const sp<GraphicBuffer>& buffe 


    if (const auto& iter = cache.find(buffer->getId()); iter == cache.end()) {

        std::shared_ptr<AutoBackendTexture::LocalRef> imageTextureRef =

                std::make_shared<AutoBackendTexture::LocalRef>(grContext.get(),

                std::make_shared<AutoBackendTexture::LocalRef>(grContext,

                                                               buffer->toAHardwareBuffer(),

                                                               isRenderable);

        cache.insert({buffer->getId(), imageTextureRef});
@@ -695,7 +715,7 @@ status_t SkiaGLRenderEngine::drawLayers(const DisplaySettings& display, 


    validateOutputBufferUsage(buffer->getBuffer());



    auto grContext = mInProtectedContext ? mProtectedGrContext : mGrContext;

    auto grContext = getActiveGrContext();

    auto& cache = mInProtectedContext ? mProtectedTextureCache : mTextureCache;



    std::shared_ptr<AutoBackendTexture::LocalRef> surfaceTextureRef;
@@ -703,14 +723,15 @@ status_t SkiaGLRenderEngine::drawLayers(const DisplaySettings& display, 
        surfaceTextureRef = it->second;

    } else {

        surfaceTextureRef =

                std::make_shared<AutoBackendTexture::LocalRef>(grContext.get(),

                      buffer->getBuffer()->toAHardwareBuffer(), true);

                std::make_shared<AutoBackendTexture::LocalRef>(grContext,

                                                               buffer->getBuffer()

                                                                       ->toAHardwareBuffer(),

                                                               true);

    }



    const ui::Dataspace dstDataspace =

            mUseColorManagement ? display.outputDataspace : ui::Dataspace::UNKNOWN;

    sk_sp<SkSurface> dstSurface =

            surfaceTextureRef->getOrCreateSurface(dstDataspace, grContext.get());

    sk_sp<SkSurface> dstSurface = surfaceTextureRef->getOrCreateSurface(dstDataspace, grContext);



    SkCanvas* dstCanvas = mCapture->tryCapture(dstSurface.get());

    if (dstCanvas == nullptr) {
@@ -857,8 +878,8 @@ status_t SkiaGLRenderEngine::drawLayers(const DisplaySettings& display, 
                if (layer->backgroundBlurRadius > 0) {

                    ATRACE_NAME("BackgroundBlur");

                    auto blurredImage =

                            mBlurFilter->generate(grContext.get(), layer->backgroundBlurRadius,

                                                  blurInput, blurRect);

                            mBlurFilter->generate(grContext, layer->backgroundBlurRadius, blurInput,

                                                  blurRect);



                    cachedBlurs[layer->backgroundBlurRadius] = blurredImage;
@@ -871,7 +892,7 @@ status_t SkiaGLRenderEngine::drawLayers(const DisplaySettings& display, 
                    if (cachedBlurs[region.blurRadius] == nullptr) {

                        ATRACE_NAME("BlurRegion");

                        cachedBlurs[region.blurRadius] =

                                mBlurFilter->generate(grContext.get(), region.blurRadius, blurInput,

                                mBlurFilter->generate(grContext, region.blurRadius, blurInput,

                                                      blurRect);

                    }
@@ -928,7 +949,7 @@ status_t SkiaGLRenderEngine::drawLayers(const DisplaySettings& display, 
                // we didn't find anything in the cache then we intentionally did not cache this

                // buffer's resources.

                imageTextureRef = std::make_shared<

                        AutoBackendTexture::LocalRef>(grContext.get(),

                        AutoBackendTexture::LocalRef>(grContext,

                                                      item.buffer->getBuffer()->toAHardwareBuffer(),

                                                      false);

            }
@@ -937,7 +958,7 @@ status_t SkiaGLRenderEngine::drawLayers(const DisplaySettings& display, 
                    imageTextureRef->makeImage(layerDataspace,

                                               item.usePremultipliedAlpha ? kPremul_SkAlphaType

                                                                          : kUnpremul_SkAlphaType,

                                               grContext.get());

                                               grContext);



            auto texMatrix = getSkM44(item.textureTransform).asM33();

            // textureTansform was intended to be passed directly into a shader, so when
@@ -1267,13 +1288,11 @@ void SkiaGLRenderEngine::onPrimaryDisplaySizeChanged(ui::Size size) { 
    const int maxResourceBytes = size.width * size.height * SURFACE_SIZE_MULTIPLIER;



    // start by resizing the current context

    auto grContext = mInProtectedContext ? mProtectedGrContext : mGrContext;

    grContext->setResourceCacheLimit(maxResourceBytes);

    getActiveGrContext()->setResourceCacheLimit(maxResourceBytes);



    // if it is possible to switch contexts then we will resize the other context

    if (useProtectedContext(!mInProtectedContext)) {

        grContext = mInProtectedContext ? mProtectedGrContext : mGrContext;

        grContext->setResourceCacheLimit(maxResourceBytes);

        getActiveGrContext()->setResourceCacheLimit(maxResourceBytes);

        // reset back to the initial context that was active when this method was called

        useProtectedContext(!mInProtectedContext);

    }

libs/renderengine/skia/SkiaGLRenderEngine.h

+1 −0
Original line number Diff line number Diff line
@@ -94,6 +94,7 @@ private: 
    inline SkColor getSkColor(const vec4& color);

    inline SkM44 getSkM44(const mat4& matrix);

    inline SkPoint3 getSkPoint3(const vec3& vector);

    inline GrDirectContext* getActiveGrContext() const;



    base::unique_fd flush();

    bool waitFence(base::unique_fd fenceFd);