xref: /frameworks/base/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <gtest/gtest.h>
#include <VectorDrawable.h>

#include "AnimationContext.h"
#include "DamageAccumulator.h"
#include "IContextFactory.h"
#include "pipeline/skia/SkiaDisplayList.h"
#include "pipeline/skia/SkiaPipeline.h"
#include "pipeline/skia/SkiaRecordingCanvas.h"
#include "renderthread/CanvasContext.h"
#include "tests/common/TestUtils.h"
#include "SkiaCanvas.h"
#include <SkSurface_Base.h>
#include <SkLiteRecorder.h>
#include <SkClipStack.h>
#include "FatalTestCanvas.h"
#include <string.h>


using namespace android;
using namespace android::uirenderer;
using namespace android::uirenderer::renderthread;
using namespace android::uirenderer::skiapipeline;

TEST(RenderNodeDrawable, create) {
    auto rootNode = TestUtils::createNode(0, 0, 200, 400,
            [](RenderProperties& props, Canvas& canvas) {
                canvas.drawColor(Color::Red_500, SkBlendMode::kSrcOver);
            });

    SkLiteDL skLiteDL;
    SkLiteRecorder canvas;
    canvas.reset(&skLiteDL, SkIRect::MakeWH(1, 1));
    canvas.translate(100, 100);
    RenderNodeDrawable drawable(rootNode.get(), &canvas);

    ASSERT_EQ(drawable.getRenderNode(), rootNode.get());
    ASSERT_EQ(&drawable.getNodeProperties(), &rootNode->properties());
    ASSERT_EQ(drawable.getRecordedMatrix(), canvas.getTotalMatrix());
}

namespace {

static void drawOrderedRect(Canvas* canvas, uint8_t expectedDrawOrder) {
    SkPaint paint;
    // order put in blue channel, transparent so overlapped content doesn't get rejected
    paint.setColor(SkColorSetARGB(1, 0, 0, expectedDrawOrder));
    canvas->drawRect(0, 0, 100, 100, paint);
}

static void drawOrderedNode(Canvas* canvas, uint8_t expectedDrawOrder, float z) {
    auto node = TestUtils::createSkiaNode(0, 0, 100, 100,
            [expectedDrawOrder, z](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedRect(&canvas, expectedDrawOrder);
        props.setTranslationZ(z);
    });
    canvas->drawRenderNode(node.get()); // canvas takes reference/sole ownership
}

static void drawOrderedNode(Canvas* canvas, uint8_t expectedDrawOrder,
        std::function<void(RenderProperties& props, SkiaRecordingCanvas& canvas)> setup) {
    auto node = TestUtils::createSkiaNode(0, 0, 100, 100,
            [expectedDrawOrder, setup](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedRect(&canvas, expectedDrawOrder);
        if (setup) {
             setup(props, canvas);
        }
    });
    canvas->drawRenderNode(node.get()); // canvas takes reference/sole ownership
}

class ZReorderCanvas : public SkCanvas {
public:
    ZReorderCanvas(int width, int height) : SkCanvas(width, height) {}
    void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
        int expectedOrder = SkColorGetB(paint.getColor()); // extract order from blue channel
        EXPECT_EQ(expectedOrder, mDrawCounter++) << "An op was drawn out of order";
    }
    int getIndex() { return mDrawCounter; }
protected:
    int mDrawCounter = 0;
};

} // end anonymous namespace

TEST(RenderNodeDrawable, zReorder) {

    auto parent = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        canvas.insertReorderBarrier(true);
        canvas.insertReorderBarrier(false);
        drawOrderedNode(&canvas, 0, 10.0f); // in reorder=false at this point, so played inorder
        drawOrderedRect(&canvas, 1);
        canvas.insertReorderBarrier(true);
        drawOrderedNode(&canvas, 6, 2.0f);
        drawOrderedRect(&canvas, 3);
        drawOrderedNode(&canvas, 4, 0.0f);
        drawOrderedRect(&canvas, 5);
        drawOrderedNode(&canvas, 2, -2.0f);
        drawOrderedNode(&canvas, 7, 2.0f);
        canvas.insertReorderBarrier(false);
        drawOrderedRect(&canvas, 8);
        drawOrderedNode(&canvas, 9, -10.0f); // in reorder=false at this point, so played inorder
        canvas.insertReorderBarrier(true); //reorder a node ahead of drawrect op
        drawOrderedRect(&canvas, 11);
        drawOrderedNode(&canvas, 10, -1.0f);
        canvas.insertReorderBarrier(false);
        canvas.insertReorderBarrier(true); //test with two empty reorder sections
        canvas.insertReorderBarrier(true);
        canvas.insertReorderBarrier(false);
        drawOrderedRect(&canvas, 12);
    });

    //create a canvas not backed by any device/pixels, but with dimensions to avoid quick rejection
    ZReorderCanvas canvas(100, 100);
    RenderNodeDrawable drawable(parent.get(), &canvas, false);
    canvas.drawDrawable(&drawable);
    EXPECT_EQ(13, canvas.getIndex());
}

TEST(RenderNodeDrawable, composeOnLayer)
{
    auto surface = SkSurface::MakeRasterN32Premul(1, 1);
    SkCanvas& canvas = *surface->getCanvas();
    canvas.drawColor(SK_ColorBLUE, SkBlendMode::kSrcOver);
    ASSERT_EQ(TestUtils::getColor(surface, 0, 0), SK_ColorBLUE);

    auto rootNode = TestUtils::createSkiaNode(0, 0, 1, 1,
        [](RenderProperties& props, SkiaRecordingCanvas& recorder) {
            recorder.drawColor(SK_ColorRED, SkBlendMode::kSrcOver);
        });

    //attach a layer to the render node
    auto surfaceLayer = SkSurface::MakeRasterN32Premul(1, 1);
    auto canvas2 = surfaceLayer->getCanvas();
    canvas2->drawColor(SK_ColorWHITE, SkBlendMode::kSrcOver);
    rootNode->setLayerSurface(surfaceLayer);

    RenderNodeDrawable drawable1(rootNode.get(), &canvas, false);
    canvas.drawDrawable(&drawable1);
    ASSERT_EQ(SK_ColorRED, TestUtils::getColor(surface, 0, 0));

    RenderNodeDrawable drawable2(rootNode.get(), &canvas, true);
    canvas.drawDrawable(&drawable2);
    ASSERT_EQ(SK_ColorWHITE, TestUtils::getColor(surface, 0, 0));

    RenderNodeDrawable drawable3(rootNode.get(), &canvas, false);
    canvas.drawDrawable(&drawable3);
    ASSERT_EQ(SK_ColorRED, TestUtils::getColor(surface, 0, 0));

    rootNode->setLayerSurface(sk_sp<SkSurface>());
}

namespace {
static SkRect getRecorderClipBounds(const SkiaRecordingCanvas& recorder) {
    SkRect clipBounds;
    recorder.getClipBounds(&clipBounds);
    return clipBounds;
}

static SkMatrix getRecorderMatrix(const SkiaRecordingCanvas& recorder) {
    SkMatrix matrix;
    recorder.getMatrix(&matrix);
    return matrix;
}
}

TEST(RenderNodeDrawable, saveLayerClipAndMatrixRestore)
{
    auto surface = SkSurface::MakeRasterN32Premul(400, 800);
    SkCanvas& canvas = *surface->getCanvas();
    canvas.drawColor(SK_ColorWHITE, SkBlendMode::kSrcOver);
    ASSERT_EQ(TestUtils::getColor(surface, 0, 0), SK_ColorWHITE);

    auto rootNode = TestUtils::createSkiaNode(0, 0, 400, 800,
        [](RenderProperties& props, SkiaRecordingCanvas& recorder) {
            SkPaint layerPaint;
            ASSERT_EQ(SkRect::MakeLTRB(0, 0, 400, 800), getRecorderClipBounds(recorder));
            EXPECT_TRUE(getRecorderMatrix(recorder).isIdentity());

            //note we don't pass SaveFlags::MatrixClip, but matrix and clip will be saved
            recorder.saveLayer(0, 0, 400, 400, &layerPaint, SaveFlags::ClipToLayer);
            ASSERT_EQ(SkRect::MakeLTRB(0, 0, 400, 400), getRecorderClipBounds(recorder));
            EXPECT_TRUE(getRecorderMatrix(recorder).isIdentity());

            recorder.clipRect(50, 50, 350, 350, SkClipOp::kIntersect);
            ASSERT_EQ(SkRect::MakeLTRB(50, 50, 350, 350), getRecorderClipBounds(recorder));

            recorder.translate(300.0f, 400.0f);
            EXPECT_EQ(SkMatrix::MakeTrans(300.0f, 400.0f), getRecorderMatrix(recorder));

            recorder.restore();
            ASSERT_EQ(SkRect::MakeLTRB(0, 0, 400, 800), getRecorderClipBounds(recorder));
            EXPECT_TRUE(getRecorderMatrix(recorder).isIdentity());

            SkPaint paint;
            paint.setAntiAlias(true);
            paint.setColor(SK_ColorGREEN);
            recorder.drawRect(0.0f, 400.0f, 400.0f, 800.0f, paint);
        });

    RenderNodeDrawable drawable(rootNode.get(), &canvas, true);
    canvas.drawDrawable(&drawable);
    ASSERT_EQ(SK_ColorGREEN, TestUtils::getColor(surface, 200, 600));
}

namespace {
class ContextFactory : public IContextFactory {
public:
    virtual AnimationContext* createAnimationContext(renderthread::TimeLord& clock) override {
        return new AnimationContext(clock);
    }
};
} // end anonymous namespace

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorder) {
    static const int SCROLL_X = 5;
    static const int SCROLL_Y = 10;
    class ProjectionTestCanvas : public SkCanvas {
    public:
        ProjectionTestCanvas(int width, int height) : SkCanvas(width, height) {}
        void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
            const int index = mDrawCounter++;
            SkMatrix expectedMatrix;;
            switch (index) {
            case 0:  //this is node "B"
                EXPECT_EQ(SkRect::MakeWH(100, 100), rect);
                EXPECT_EQ(SK_ColorWHITE, paint.getColor());
                expectedMatrix.reset();
                EXPECT_EQ(SkRect::MakeLTRB(0, 0, 100, 100), TestUtils::getClipBounds(this));
                break;
            case 1:  //this is node "P"
                EXPECT_EQ(SkRect::MakeLTRB(-10, -10, 60, 60), rect);
                EXPECT_EQ(SK_ColorDKGRAY, paint.getColor());
                expectedMatrix.setTranslate(50 - SCROLL_X, 50 - SCROLL_Y);
                EXPECT_EQ(SkRect::MakeLTRB(-35, -30, 45, 50), TestUtils::getLocalClipBounds(this));
                break;
            case 2:  //this is node "C"
                EXPECT_EQ(SkRect::MakeWH(100, 50), rect);
                EXPECT_EQ(SK_ColorBLUE, paint.getColor());
                expectedMatrix.setTranslate(-SCROLL_X, 50 - SCROLL_Y);
                EXPECT_EQ(SkRect::MakeLTRB(0, 40, 95, 90), TestUtils::getClipBounds(this));
                break;
            default:
                ADD_FAILURE();
            }
            EXPECT_EQ(expectedMatrix, getTotalMatrix());
        }

        int getIndex() { return mDrawCounter; }
    protected:
        int mDrawCounter = 0;
    };

    /**
     * Construct a tree of nodes, where the root (A) has a receiver background (B), and a child (C)
     * with a projecting child (P) of its own. P would normally draw between B and C's "background"
     * draw, but because it is projected backwards, it's drawn in between B and C.
     *
     * The parent is scrolled by SCROLL_X/SCROLL_Y, but this does not affect the background
     * (which isn't affected by scroll).
     */
    auto receiverBackground = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        properties.setProjectionReceiver(true);
        // scroll doesn't apply to background, so undone via translationX/Y
        // NOTE: translationX/Y only! no other transform properties may be set for a proj receiver!
        properties.setTranslationX(SCROLL_X);
        properties.setTranslationY(SCROLL_Y);

        SkPaint paint;
        paint.setColor(SK_ColorWHITE);
        canvas.drawRect(0, 0, 100, 100, paint);
    }, "B");

    auto projectingRipple = TestUtils::createSkiaNode(50, 0, 100, 50,
            [](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        properties.setProjectBackwards(true);
        properties.setClipToBounds(false);
        SkPaint paint;
        paint.setColor(SK_ColorDKGRAY);
        canvas.drawRect(-10, -10, 60, 60, paint);
    }, "P");
    auto child = TestUtils::createSkiaNode(0, 50, 100, 100,
            [&projectingRipple](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        SkPaint paint;
        paint.setColor(SK_ColorBLUE);
        canvas.drawRect(0, 0, 100, 50, paint);
        canvas.drawRenderNode(projectingRipple.get());
    }, "C");
    auto parent = TestUtils::createSkiaNode(0, 0, 100, 100,
            [&receiverBackground, &child](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        // Set a rect outline for the projecting ripple to be masked against.
        properties.mutableOutline().setRoundRect(10, 10, 90, 90, 5, 1.0f);

        canvas.save(SaveFlags::MatrixClip);
        canvas.translate(-SCROLL_X, -SCROLL_Y); // Apply scroll (note: bg undoes this internally)
        canvas.drawRenderNode(receiverBackground.get());
        canvas.drawRenderNode(child.get());
        canvas.restore();
    }, "A");
    ContextFactory contextFactory;
    std::unique_ptr<CanvasContext> canvasContext(CanvasContext::create(
            renderThread, false, parent.get(), &contextFactory));
    TreeInfo info(TreeInfo::MODE_RT_ONLY, *canvasContext.get());
    DamageAccumulator damageAccumulator;
    info.damageAccumulator = &damageAccumulator;
    parent->prepareTree(info);

    //parent(A)             -> (receiverBackground, child)
    //child(C)              -> (rect[0, 0, 100, 50], projectingRipple)
    //projectingRipple(P)   -> (rect[-10, -10, 60, 60]) -> projects backwards
    //receiverBackground(B) -> (rect[0, 0, 100, 100]) -> projection receiver

    //create a canvas not backed by any device/pixels, but with dimensions to avoid quick rejection
    ProjectionTestCanvas canvas(100, 100);
    RenderNodeDrawable drawable(parent.get(), &canvas, true);
    canvas.drawDrawable(&drawable);
    EXPECT_EQ(3, canvas.getIndex());
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionHwLayer) {
    /* R is backward projected on B and C is a layer.
                A
               / \
              B   C
                  |
                  R
    */
    static const int SCROLL_X = 5;
    static const int SCROLL_Y = 10;
    static const int CANVAS_WIDTH = 400;
    static const int CANVAS_HEIGHT = 400;
    static const int LAYER_WIDTH = 200;
    static const int LAYER_HEIGHT = 200;
    class ProjectionTestCanvas : public SkCanvas {
    public:
        ProjectionTestCanvas(int* drawCounter)
            : SkCanvas(CANVAS_WIDTH, CANVAS_HEIGHT)
            , mDrawCounter(drawCounter)
        {}
        void onDrawArc(const SkRect&, SkScalar startAngle, SkScalar sweepAngle, bool useCenter,
                const SkPaint&) override {
            EXPECT_EQ(0, (*mDrawCounter)++); //part of painting the layer
            EXPECT_EQ(SkRect::MakeLTRB(0, 0, LAYER_WIDTH, LAYER_HEIGHT), TestUtils::getClipBounds(this));
        }
        void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
            EXPECT_EQ(1, (*mDrawCounter)++);
            EXPECT_EQ(SkRect::MakeLTRB(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT), TestUtils::getClipBounds(this));
        }
        void onDrawOval(const SkRect&, const SkPaint&) override {
            EXPECT_EQ(2, (*mDrawCounter)++);
            SkMatrix expectedMatrix;
            expectedMatrix.setTranslate(100 - SCROLL_X, 100 - SCROLL_Y);
            EXPECT_EQ(expectedMatrix, getTotalMatrix());
            EXPECT_EQ(SkRect::MakeLTRB(-85, -80, 295, 300), TestUtils::getLocalClipBounds(this));
        }
        int* mDrawCounter;
    };

    class ProjectionLayer : public SkSurface_Base {
    public:
        ProjectionLayer(int* drawCounter)
            : SkSurface_Base(SkImageInfo::MakeN32Premul(LAYER_WIDTH, LAYER_HEIGHT), nullptr)
            , mDrawCounter(drawCounter) {
        }
        void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) override {
            EXPECT_EQ(3, (*mDrawCounter)++);
            EXPECT_EQ(SkRect::MakeLTRB(100 - SCROLL_X, 100 - SCROLL_Y, 300 - SCROLL_X,
                   300 - SCROLL_Y), TestUtils::getClipBounds(this->getCanvas()));
        }
        SkCanvas* onNewCanvas() override {
            return new ProjectionTestCanvas(mDrawCounter);
        }
        sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override {
            return nullptr;
        }
        sk_sp<SkImage> onNewImageSnapshot() override {
            return nullptr;
        }
        void onCopyOnWrite(ContentChangeMode) override {}
        int* mDrawCounter;
    };

    auto receiverBackground = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        properties.setProjectionReceiver(true);
        // scroll doesn't apply to background, so undone via translationX/Y
        // NOTE: translationX/Y only! no other transform properties may be set for a proj receiver!
        properties.setTranslationX(SCROLL_X);
        properties.setTranslationY(SCROLL_Y);

        canvas.drawRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT, SkPaint());
    }, "B"); //B
    auto projectingRipple = TestUtils::createSkiaNode(0, 0, LAYER_WIDTH, LAYER_HEIGHT,
            [](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        properties.setProjectBackwards(true);
        properties.setClipToBounds(false);
        canvas.drawOval(100, 100, 300, 300, SkPaint()); // drawn mostly out of layer bounds
    }, "R"); //R
    auto child = TestUtils::createSkiaNode(100, 100, 300, 300,
            [&projectingRipple](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        canvas.drawRenderNode(projectingRipple.get());
        canvas.drawArc(0, 0, LAYER_WIDTH, LAYER_HEIGHT, 0.0f, 280.0f, true, SkPaint());
    }, "C"); //C
    auto parent = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [&receiverBackground, &child](RenderProperties& properties,
            SkiaRecordingCanvas& canvas) {
        // Set a rect outline for the projecting ripple to be masked against.
        properties.mutableOutline().setRoundRect(10, 10, 390, 390, 0, 1.0f);
        canvas.translate(-SCROLL_X, -SCROLL_Y); // Apply scroll (note: bg undoes this internally)
        canvas.drawRenderNode(receiverBackground.get());
        canvas.drawRenderNode(child.get());
    }, "A"); //A

    //prepareTree is required to find, which receivers have backward projected nodes
    ContextFactory contextFactory;
    std::unique_ptr<CanvasContext> canvasContext(CanvasContext::create(
            renderThread, false, parent.get(), &contextFactory));
    TreeInfo info(TreeInfo::MODE_RT_ONLY, *canvasContext.get());
    DamageAccumulator damageAccumulator;
    info.damageAccumulator = &damageAccumulator;
    parent->prepareTree(info);

    int drawCounter = 0;
    //set a layer after prepareTree to avoid layer logic there
    child->animatorProperties().mutateLayerProperties().setType(LayerType::RenderLayer);
    sk_sp<SkSurface> surfaceLayer1(new ProjectionLayer(&drawCounter));
    child->setLayerSurface(surfaceLayer1);
    Matrix4 windowTransform;
    windowTransform.loadTranslate(100, 100, 0);
    child->getSkiaLayer()->inverseTransformInWindow.loadInverse(windowTransform);

    LayerUpdateQueue layerUpdateQueue;
    layerUpdateQueue.enqueueLayerWithDamage(child.get(),
            android::uirenderer::Rect(LAYER_WIDTH, LAYER_HEIGHT));
    SkiaPipeline::renderLayersImpl(layerUpdateQueue, true);
    EXPECT_EQ(1, drawCounter);  //assert index 0 is drawn on the layer

    RenderNodeDrawable drawable(parent.get(), surfaceLayer1->getCanvas(), true);
    surfaceLayer1->getCanvas()->drawDrawable(&drawable);
    EXPECT_EQ(4, drawCounter);

    // clean up layer pointer, so we can safely destruct RenderNode
    child->setLayerSurface(nullptr);
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionChildScroll) {
    /* R is backward projected on B.
                A
               / \
              B   C
                  |
                  R
    */
    static const int SCROLL_X = 500000;
    static const int SCROLL_Y = 0;
    static const int CANVAS_WIDTH = 400;
    static const int CANVAS_HEIGHT = 400;
    class ProjectionChildScrollTestCanvas : public SkCanvas {
    public:
        ProjectionChildScrollTestCanvas() : SkCanvas(CANVAS_WIDTH, CANVAS_HEIGHT) {}
        void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
            EXPECT_EQ(0, mDrawCounter++);
            EXPECT_TRUE(getTotalMatrix().isIdentity());
        }
        void onDrawOval(const SkRect&, const SkPaint&) override {
            EXPECT_EQ(1, mDrawCounter++);
            EXPECT_EQ(SkRect::MakeWH(CANVAS_WIDTH, CANVAS_HEIGHT), TestUtils::getClipBounds(this));
            EXPECT_TRUE(getTotalMatrix().isIdentity());
        }
        int mDrawCounter = 0;
    };

    auto receiverBackground = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        properties.setProjectionReceiver(true);
        canvas.drawRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT, SkPaint());
    }, "B"); //B
    auto projectingRipple = TestUtils::createSkiaNode(0, 0, 200, 200,
            [](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        // scroll doesn't apply to background, so undone via translationX/Y
        // NOTE: translationX/Y only! no other transform properties may be set for a proj receiver!
        properties.setTranslationX(SCROLL_X);
        properties.setTranslationY(SCROLL_Y);
        properties.setProjectBackwards(true);
        properties.setClipToBounds(false);
        canvas.drawOval(0, 0, 200, 200, SkPaint());
    }, "R"); //R
    auto child = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [&projectingRipple](RenderProperties& properties, SkiaRecordingCanvas& canvas) {
        // Record time clip will be ignored by projectee
        canvas.clipRect(100, 100, 300, 300, SkClipOp::kIntersect);

        canvas.translate(-SCROLL_X, -SCROLL_Y); // Apply scroll (note: bg undoes this internally)
        canvas.drawRenderNode(projectingRipple.get());
    }, "C"); //C
    auto parent = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [&receiverBackground, &child](RenderProperties& properties,
            SkiaRecordingCanvas& canvas) {
        canvas.drawRenderNode(receiverBackground.get());
        canvas.drawRenderNode(child.get());
    }, "A"); //A

    //prepareTree is required to find, which receivers have backward projected nodes
    ContextFactory contextFactory;
    std::unique_ptr<CanvasContext> canvasContext(CanvasContext::create(
            renderThread, false, parent.get(), &contextFactory));
    TreeInfo info(TreeInfo::MODE_RT_ONLY, *canvasContext.get());
    DamageAccumulator damageAccumulator;
    info.damageAccumulator = &damageAccumulator;
    parent->prepareTree(info);

    std::unique_ptr<ProjectionChildScrollTestCanvas> canvas(new ProjectionChildScrollTestCanvas());
    RenderNodeDrawable drawable(parent.get(), canvas.get(), true);
    canvas->drawDrawable(&drawable);
    EXPECT_EQ(2, canvas->mDrawCounter);
}

namespace {
static int drawNode(RenderThread& renderThread, const sp<RenderNode>& renderNode)
{
    ContextFactory contextFactory;
    std::unique_ptr<CanvasContext> canvasContext(CanvasContext::create(
            renderThread, false, renderNode.get(), &contextFactory));
    TreeInfo info(TreeInfo::MODE_RT_ONLY, *canvasContext.get());
    DamageAccumulator damageAccumulator;
    info.damageAccumulator = &damageAccumulator;
    renderNode->prepareTree(info);

    //create a canvas not backed by any device/pixels, but with dimensions to avoid quick rejection
    ZReorderCanvas canvas(100, 100);
    RenderNodeDrawable drawable(renderNode.get(), &canvas, false);
    canvas.drawDrawable(&drawable);
    return canvas.getIndex();
}
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderProjectedInMiddle) {
    /* R is backward projected on B
                A
               / \
              B   C
                  |
                  R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            props.setProjectionReceiver(true);
        } ); //nodeB
        drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(3, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderProjectLast) {
    /* R is backward projected on E
                  A
                / | \
               /  |  \
              B   C   E
                  |
                  R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, nullptr); //nodeB
        drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            drawOrderedNode(&canvas, 3, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //drawn as 2
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeC
        drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //drawn as 3
            props.setProjectionReceiver(true);
        } ); //nodeE
    }); //nodeA
    EXPECT_EQ(4, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderNoReceivable) {
    /* R is backward projected without receiver
                A
               / \
              B   C
                  |
                  R
    */
     auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, nullptr); //nodeB
        drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            drawOrderedNode(&canvas, 255, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                //not having a projection receiver is an undefined behavior
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(2, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderParentReceivable) {
    /* R is backward projected on C
                A
               / \
              B   C
                  |
                  R
    */
     auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, nullptr); //nodeB
        drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            props.setProjectionReceiver(true);
            drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(3, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderSameNodeReceivable) {
    /* R is backward projected on R
                A
               / \
              B   C
                  |
                  R
    */
     auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, nullptr); //nodeB
        drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            drawOrderedNode(&canvas, 255, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                //having a node that is projected on itself is an undefined/unexpected behavior
                props.setProjectionReceiver(true);
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(2, drawNode(renderThread, nodeA));
}

//Note: the outcome for this test is different in HWUI
RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderProjectedSibling) {
    /* R is set to project on B, but R is not drawn because projecting on a sibling is not allowed.
                A
               /|\
              / | \
             B  C  R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            props.setProjectionReceiver(true);
        } ); //nodeB
        drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        } ); //nodeC
        drawOrderedNode(&canvas, 255, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            props.setProjectBackwards(true);
            props.setClipToBounds(false);
        } ); //nodeR
    }); //nodeA
    EXPECT_EQ(2, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderProjectedSibling2) {
    /* R is set to project on B, but R is not drawn because projecting on a sibling is not allowed.
                A
                |
                G
               /|\
              / | \
             B  C  R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                props.setProjectionReceiver(true);
            } ); //nodeB
            drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            } ); //nodeC
            drawOrderedNode(&canvas, 255, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeG
    }); //nodeA
    EXPECT_EQ(3, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderGrandparentReceivable) {
    /* R is backward projected on B
                A
                |
                B
                |
                C
                |
                R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
            props.setProjectionReceiver(true);
            drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
                    props.setProjectBackwards(true);
                    props.setClipToBounds(false);
                } ); //nodeR
            } ); //nodeC
        } ); //nodeB
    }); //nodeA
    EXPECT_EQ(3, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderTwoReceivables) {
    /* B and G are receivables, R is backward projected
                A
               / \
              B   C
                 / \
                G   R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //B
            props.setProjectionReceiver(true);
        } ); //nodeB
        drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //C
            drawOrderedNode(&canvas, 3, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //G
                props.setProjectionReceiver(true);
            } ); //nodeG
            drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //R
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeR
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(4, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderTwoReceivablesLikelyScenario) {
    /* B and G are receivables, G is backward projected
                A
               / \
              B   C
                 / \
                G   R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //B
            props.setProjectionReceiver(true);
        } ); //nodeB
        drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //C
            drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //G
                props.setProjectionReceiver(true);
                props.setProjectBackwards(true);
                props.setClipToBounds(false);
            } ); //nodeG
            drawOrderedNode(&canvas, 3, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //R
            } ); //nodeR
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(4, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, projectionReorderTwoReceivablesDeeper) {
    /* B and G are receivables, R is backward projected
                A
               / \
              B   C
                 / \
                G   D
                    |
                    R
    */
    auto nodeA = TestUtils::createSkiaNode(0, 0, 100, 100,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        drawOrderedNode(&canvas, 0, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //B
            props.setProjectionReceiver(true);
        } ); //nodeB
        drawOrderedNode(&canvas, 1, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //C
            drawOrderedNode(&canvas, 2, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //G
                props.setProjectionReceiver(true);
            } ); //nodeG
            drawOrderedNode(&canvas, 4, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //D
                drawOrderedNode(&canvas, 3, [](RenderProperties& props, SkiaRecordingCanvas& canvas) { //R
                    props.setProjectBackwards(true);
                    props.setClipToBounds(false);
                } ); //nodeR
            } ); //nodeD
        } ); //nodeC
    }); //nodeA
    EXPECT_EQ(5, drawNode(renderThread, nodeA));
}

RENDERTHREAD_TEST(RenderNodeDrawable, simple) {
    static const int CANVAS_WIDTH = 100;
    static const int CANVAS_HEIGHT = 200;
    class SimpleTestCanvas : public TestCanvasBase {
    public:
        SimpleTestCanvas() : TestCanvasBase(CANVAS_WIDTH, CANVAS_HEIGHT) {
        }
        void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
            EXPECT_EQ(0, mDrawCounter++);
        }
        void onDrawImage(const SkImage*, SkScalar dx, SkScalar dy, const SkPaint*) override {
            EXPECT_EQ(1, mDrawCounter++);
        }
    };

    auto node = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        sk_sp<Bitmap> bitmap(TestUtils::createBitmap(25, 25));
        canvas.drawRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT, SkPaint());
        canvas.drawBitmap(*bitmap, 10, 10, nullptr);
    });

    SimpleTestCanvas canvas;
    RenderNodeDrawable drawable(node.get(), &canvas, true);
    canvas.drawDrawable(&drawable);
    EXPECT_EQ(2, canvas.mDrawCounter);
}

RENDERTHREAD_TEST(RenderNodeDrawable, colorOp_unbounded) {
    static const int CANVAS_WIDTH = 200;
    static const int CANVAS_HEIGHT = 200;
    class ColorTestCanvas : public TestCanvasBase {
    public:
        ColorTestCanvas() : TestCanvasBase(CANVAS_WIDTH, CANVAS_HEIGHT) {
        }
        void onDrawPaint(const SkPaint&) {
            switch (mDrawCounter++) {
            case 0:
                EXPECT_EQ(SkRect::MakeWH(CANVAS_WIDTH, CANVAS_HEIGHT),
                        TestUtils::getClipBounds(this));
                break;
            case 1:
                EXPECT_EQ(SkRect::MakeWH(10, 10), TestUtils::getClipBounds(this));
                break;
            default:
                ADD_FAILURE();
            }
        }
    };

    auto unclippedColorView = TestUtils::createSkiaNode(0, 0, 10, 10,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        props.setClipToBounds(false);
        canvas.drawColor(SK_ColorWHITE, SkBlendMode::kSrcOver);
    });

    auto clippedColorView = TestUtils::createSkiaNode(0, 0, 10, 10,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        canvas.drawColor(SK_ColorWHITE, SkBlendMode::kSrcOver);
    });

    ColorTestCanvas canvas;
    RenderNodeDrawable drawable(unclippedColorView.get(), &canvas, true);
    canvas.drawDrawable(&drawable);
    EXPECT_EQ(1, canvas.mDrawCounter);
    RenderNodeDrawable drawable2(clippedColorView.get(), &canvas, true);
    canvas.drawDrawable(&drawable2);
    EXPECT_EQ(2, canvas.mDrawCounter);
}

TEST(RenderNodeDrawable, renderNode) {
    static const int CANVAS_WIDTH = 200;
    static const int CANVAS_HEIGHT = 200;
    class RenderNodeTestCanvas : public TestCanvasBase {
    public:
        RenderNodeTestCanvas() : TestCanvasBase(CANVAS_WIDTH, CANVAS_HEIGHT) {
        }
        void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
            switch(mDrawCounter++) {
            case 0:
                EXPECT_EQ(SkRect::MakeWH(CANVAS_WIDTH, CANVAS_HEIGHT), TestUtils::getClipBounds(this));
                EXPECT_EQ(SK_ColorDKGRAY, paint.getColor());
                break;
            case 1:
                EXPECT_EQ(SkRect::MakeLTRB(50, 50, 150, 150), TestUtils::getClipBounds(this));
                EXPECT_EQ(SK_ColorWHITE, paint.getColor());
                break;
            default:
                ADD_FAILURE();
            }
        }
    };

    auto child = TestUtils::createSkiaNode(10, 10, 110, 110,
            [](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        SkPaint paint;
        paint.setColor(SK_ColorWHITE);
        canvas.drawRect(0, 0, 100, 100, paint);
    });

    auto parent = TestUtils::createSkiaNode(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT,
            [&child](RenderProperties& props, SkiaRecordingCanvas& canvas) {
        SkPaint paint;
        paint.setColor(SK_ColorDKGRAY);
        canvas.drawRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT, paint);

        canvas.save(SaveFlags::MatrixClip);
        canvas.translate(40, 40);
        canvas.drawRenderNode(child.get());
        canvas.restore();
    });

    RenderNodeTestCanvas canvas;
    RenderNodeDrawable drawable(parent.get(), &canvas, true);
    canvas.drawDrawable(&drawable);
    EXPECT_EQ(2, canvas.mDrawCounter);
}