Merge "Fix crash in Vulkan WebView drawable when parent View has alpha"

#include "renderthread/VulkanManager.h"

#include "renderthread/RenderThread.h"

#include <SkAndroidFrameworkUtils.h>

#include <GrBackendDrawableInfo.h>

#include <SkImage.h>

#include <utils/Color.h>

VkFunctorDrawable::~VkFunctorDrawable() {

}

void VkFunctorDrawable::onDraw(SkCanvas* /*canvas*/) {

    LOG_ALWAYS_FATAL("VkFunctorDrawable::onDraw() should never be called.");

    // Instead of calling onDraw(), the call should come from onSnapGpuDrawHandler.

void VkFunctorDrawable::onDraw(SkCanvas* canvas) {

    // "canvas" is either SkNWayCanvas created by SkiaPipeline::tryCapture (SKP capture use case) or

    // AlphaFilterCanvas (used by RenderNodeDrawable to apply alpha in certain cases).

    // "VkFunctorDrawable::onDraw" is not invoked for the most common case, when drawing in a GPU

    // canvas.

    if (canvas->getGrContext() == nullptr) {

        // We're dumping a picture, render a light-blue rectangle instead

        SkPaint paint;

        paint.setColor(0xFF81D4FA);

        canvas->drawRect(mBounds, paint);

    } else {

        // Handle the case when "canvas" is AlphaFilterCanvas. Find the wrapped GPU canvas.

        SkCanvas* gpuCanvas = SkAndroidFrameworkUtils::getBaseWrappedCanvas(canvas);

        // Enforce "canvas" must be an AlphaFilterCanvas. For GPU canvas, the call should come from

        // onSnapGpuDrawHandler.

        LOG_ALWAYS_FATAL_IF(

                gpuCanvas == canvas,

                "VkFunctorDrawable::onDraw() should not be called with a GPU canvas!");

        // This will invoke onSnapGpuDrawHandler and regular draw flow.

        gpuCanvas->drawDrawable(this);

    }

}

std::unique_ptr<FunctorDrawable::GpuDrawHandler> VkFunctorDrawable::onSnapGpuDrawHandler(