libs/hwui/RenderNode.cpp

/*
 * Copyright (C) 2014 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 "RenderNode.h"

#include "BakedOpRenderer.h"
#include "DamageAccumulator.h"
#include "Debug.h"
#include "RecordedOp.h"
#include "TreeInfo.h"
#include "VectorDrawable.h"
#include "renderstate/RenderState.h"
#include "renderthread/CanvasContext.h"
#include "utils/FatVector.h"
#include "utils/MathUtils.h"
#include "utils/StringUtils.h"
#include "utils/TraceUtils.h"

#include <SkPathOps.h>
#include <algorithm>
#include <sstream>
#include <string>

namespace android {
namespace uirenderer {

// Used for tree mutations that are purely destructive.
// Generic tree mutations should use MarkAndSweepObserver instead
class ImmediateRemoved : public TreeObserver {
public:
    explicit ImmediateRemoved(TreeInfo* info) : mTreeInfo(info) {}

    void onMaybeRemovedFromTree(RenderNode* node) override { node->onRemovedFromTree(mTreeInfo); }

private:
    TreeInfo* mTreeInfo;
};

RenderNode::RenderNode()
        : mDirtyPropertyFields(0)
        , mNeedsDisplayListSync(false)
        , mDisplayList(nullptr)
        , mStagingDisplayList(nullptr)
        , mAnimatorManager(*this)
        , mParentCount(0) {}

RenderNode::~RenderNode() {
    ImmediateRemoved observer(nullptr);
    deleteDisplayList(observer);
    delete mStagingDisplayList;
    LOG_ALWAYS_FATAL_IF(hasLayer(), "layer missed detachment!");
}

void RenderNode::setStagingDisplayList(DisplayList* displayList) {
    mValid = (displayList != nullptr);
    mNeedsDisplayListSync = true;
    delete mStagingDisplayList;
    mStagingDisplayList = displayList;
}

/**
 * This function is a simplified version of replay(), where we simply retrieve and log the
 * display list. This function should remain in sync with the replay() function.
 */
void RenderNode::output() {
    LogcatStream strout;
    strout << "Root";
    output(strout, 0);
}

void RenderNode::output(std::ostream& output, uint32_t level) {
    output << "  (" << getName() << " " << this
           << (MathUtils::isZero(properties().getAlpha()) ? ", zero alpha" : "")
           << (properties().hasShadow() ? ", casting shadow" : "")
           << (isRenderable() ? "" : ", empty")
           << (properties().getProjectBackwards() ? ", projected" : "")
           << (hasLayer() ? ", on HW Layer" : "") << ")" << std::endl;

    properties().debugOutputProperties(output, level + 1);

    if (mDisplayList) {
        mDisplayList->output(output, level);
    }
    output << std::string(level * 2, ' ') << "/RenderNode(" << getName() << " " << this << ")";
    output << std::endl;
}

int RenderNode::getDebugSize() {
    int size = sizeof(RenderNode);
    if (mStagingDisplayList) {
        size += mStagingDisplayList->getUsedSize();
    }
    if (mDisplayList && mDisplayList != mStagingDisplayList) {
        size += mDisplayList->getUsedSize();
    }
    return size;
}

void RenderNode::prepareTree(TreeInfo& info) {
    ATRACE_CALL();
    LOG_ALWAYS_FATAL_IF(!info.damageAccumulator, "DamageAccumulator missing");
    MarkAndSweepRemoved observer(&info);

    // The OpenGL renderer reserves the stencil buffer for overdraw debugging.  Functors
    // will need to be drawn in a layer.
    bool functorsNeedLayer = Properties::debugOverdraw && !Properties::isSkiaEnabled();

    prepareTreeImpl(observer, info, functorsNeedLayer);
}

void RenderNode::addAnimator(const sp<BaseRenderNodeAnimator>& animator) {
    mAnimatorManager.addAnimator(animator);
}

void RenderNode::removeAnimator(const sp<BaseRenderNodeAnimator>& animator) {
    mAnimatorManager.removeAnimator(animator);
}

void RenderNode::damageSelf(TreeInfo& info) {
    if (isRenderable()) {
        if (properties().getClipDamageToBounds()) {
            info.damageAccumulator->dirty(0, 0, properties().getWidth(), properties().getHeight());
        } else {
            // Hope this is big enough?
            // TODO: Get this from the display list ops or something
            info.damageAccumulator->dirty(DIRTY_MIN, DIRTY_MIN, DIRTY_MAX, DIRTY_MAX);
        }
    }
}

void RenderNode::prepareLayer(TreeInfo& info, uint32_t dirtyMask) {
    LayerType layerType = properties().effectiveLayerType();
    if (CC_UNLIKELY(layerType == LayerType::RenderLayer)) {
        // Damage applied so far needs to affect our parent, but does not require
        // the layer to be updated. So we pop/push here to clear out the current
        // damage and get a clean state for display list or children updates to
        // affect, which will require the layer to be updated
        info.damageAccumulator->popTransform();
        info.damageAccumulator->pushTransform(this);
        if (dirtyMask & DISPLAY_LIST) {
            damageSelf(info);
        }
    }
}

void RenderNode::pushLayerUpdate(TreeInfo& info) {
    LayerType layerType = properties().effectiveLayerType();
    // If we are not a layer OR we cannot be rendered (eg, view was detached)
    // we need to destroy any Layers we may have had previously
    if (CC_LIKELY(layerType != LayerType::RenderLayer) || CC_UNLIKELY(!isRenderable()) ||
        CC_UNLIKELY(properties().getWidth() == 0) || CC_UNLIKELY(properties().getHeight() == 0) ||
        CC_UNLIKELY(!properties().fitsOnLayer())) {
        if (CC_UNLIKELY(hasLayer())) {
            renderthread::CanvasContext::destroyLayer(this);
        }
        return;
    }

    if (info.canvasContext.createOrUpdateLayer(this, *info.damageAccumulator, info.errorHandler)) {
        damageSelf(info);
    }

    if (!hasLayer()) {
        return;
    }

    SkRect dirty;
    info.damageAccumulator->peekAtDirty(&dirty);
    info.layerUpdateQueue->enqueueLayerWithDamage(this, dirty);

    // There might be prefetched layers that need to be accounted for.
    // That might be us, so tell CanvasContext that this layer is in the
    // tree and should not be destroyed.
    info.canvasContext.markLayerInUse(this);
}

/**
 * Traverse down the the draw tree to prepare for a frame.
 *
 * MODE_FULL = UI Thread-driven (thus properties must be synced), otherwise RT driven
 *
 * While traversing down the tree, functorsNeedLayer flag is set to true if anything that uses the
 * stencil buffer may be needed. Views that use a functor to draw will be forced onto a layer.
 */
void RenderNode::prepareTreeImpl(TreeObserver& observer, TreeInfo& info, bool functorsNeedLayer) {
    info.damageAccumulator->pushTransform(this);

    if (info.mode == TreeInfo::MODE_FULL) {
        pushStagingPropertiesChanges(info);
    }
    uint32_t animatorDirtyMask = 0;
    if (CC_LIKELY(info.runAnimations)) {
        animatorDirtyMask = mAnimatorManager.animate(info);
    }

    bool willHaveFunctor = false;
    if (info.mode == TreeInfo::MODE_FULL && mStagingDisplayList) {
        willHaveFunctor = mStagingDisplayList->hasFunctor();
    } else if (mDisplayList) {
        willHaveFunctor = mDisplayList->hasFunctor();
    }
    bool childFunctorsNeedLayer =
            mProperties.prepareForFunctorPresence(willHaveFunctor, functorsNeedLayer);

    if (CC_UNLIKELY(mPositionListener.get())) {
        mPositionListener->onPositionUpdated(*this, info);
    }

    prepareLayer(info, animatorDirtyMask);
    if (info.mode == TreeInfo::MODE_FULL) {
        pushStagingDisplayListChanges(observer, info);
    }

    if (mDisplayList) {
        info.out.hasFunctors |= mDisplayList->hasFunctor();
        bool isDirty = mDisplayList->prepareListAndChildren(
                observer, info, childFunctorsNeedLayer,
                [](RenderNode* child, TreeObserver& observer, TreeInfo& info,
                   bool functorsNeedLayer) {
                    child->prepareTreeImpl(observer, info, functorsNeedLayer);
                });
        if (isDirty) {
            damageSelf(info);
        }
    }
    pushLayerUpdate(info);

    info.damageAccumulator->popTransform();
}

void RenderNode::syncProperties() {
    mProperties = mStagingProperties;
}

void RenderNode::pushStagingPropertiesChanges(TreeInfo& info) {
    // Push the animators first so that setupStartValueIfNecessary() is called
    // before properties() is trampled by stagingProperties(), as they are
    // required by some animators.
    if (CC_LIKELY(info.runAnimations)) {
        mAnimatorManager.pushStaging();
    }
    if (mDirtyPropertyFields) {
        mDirtyPropertyFields = 0;
        damageSelf(info);
        info.damageAccumulator->popTransform();
        syncProperties();
        // We could try to be clever and only re-damage if the matrix changed.
        // However, we don't need to worry about that. The cost of over-damaging
        // here is only going to be a single additional map rect of this node
        // plus a rect join(). The parent's transform (and up) will only be
        // performed once.
        info.damageAccumulator->pushTransform(this);
        damageSelf(info);
    }
}

void RenderNode::syncDisplayList(TreeObserver& observer, TreeInfo* info) {
    // Make sure we inc first so that we don't fluctuate between 0 and 1,
    // which would thrash the layer cache
    if (mStagingDisplayList) {
        mStagingDisplayList->updateChildren([](RenderNode* child) { child->incParentRefCount(); });
    }
    deleteDisplayList(observer, info);
    mDisplayList = mStagingDisplayList;
    mStagingDisplayList = nullptr;
    if (mDisplayList) {
        mDisplayList->syncContents();
    }
}

void RenderNode::pushStagingDisplayListChanges(TreeObserver& observer, TreeInfo& info) {
    if (mNeedsDisplayListSync) {
        mNeedsDisplayListSync = false;
        // Damage with the old display list first then the new one to catch any
        // changes in isRenderable or, in the future, bounds
        damageSelf(info);
        syncDisplayList(observer, &info);
        damageSelf(info);
    }
}

void RenderNode::deleteDisplayList(TreeObserver& observer, TreeInfo* info) {
    if (mDisplayList) {
        mDisplayList->updateChildren(
                [&observer, info](RenderNode* child) { child->decParentRefCount(observer, info); });
        if (!mDisplayList->reuseDisplayList(this, info ? &info->canvasContext : nullptr)) {
            delete mDisplayList;
        }
    }
    mDisplayList = nullptr;
}

void RenderNode::destroyHardwareResources(TreeInfo* info) {
    if (hasLayer()) {
        renderthread::CanvasContext::destroyLayer(this);
    }
    setStagingDisplayList(nullptr);

    ImmediateRemoved observer(info);
    deleteDisplayList(observer, info);
}

void RenderNode::destroyLayers() {
    if (hasLayer()) {
        renderthread::CanvasContext::destroyLayer(this);
    }
    if (mDisplayList) {
        mDisplayList->updateChildren([](RenderNode* child) { child->destroyLayers(); });
    }
}

void RenderNode::decParentRefCount(TreeObserver& observer, TreeInfo* info) {
    LOG_ALWAYS_FATAL_IF(!mParentCount, "already 0!");
    mParentCount--;
    if (!mParentCount) {
        observer.onMaybeRemovedFromTree(this);
        if (CC_UNLIKELY(mPositionListener.get())) {
            mPositionListener->onPositionLost(*this, info);
        }
    }
}

void RenderNode::onRemovedFromTree(TreeInfo* info) {
    destroyHardwareResources(info);
}

void RenderNode::clearRoot() {
    ImmediateRemoved observer(nullptr);
    decParentRefCount(observer);
}

/**
 * Apply property-based transformations to input matrix
 *
 * If true3dTransform is set to true, the transform applied to the input matrix will use true 4x4
 * matrix computation instead of the Skia 3x3 matrix + camera hackery.
 */
void RenderNode::applyViewPropertyTransforms(mat4& matrix, bool true3dTransform) const {
    if (properties().getLeft() != 0 || properties().getTop() != 0) {
        matrix.translate(properties().getLeft(), properties().getTop());
    }
    if (properties().getStaticMatrix()) {
        mat4 stat(*properties().getStaticMatrix());
        matrix.multiply(stat);
    } else if (properties().getAnimationMatrix()) {
        mat4 anim(*properties().getAnimationMatrix());
        matrix.multiply(anim);
    }

    bool applyTranslationZ = true3dTransform && !MathUtils::isZero(properties().getZ());
    if (properties().hasTransformMatrix() || applyTranslationZ) {
        if (properties().isTransformTranslateOnly()) {
            matrix.translate(properties().getTranslationX(), properties().getTranslationY(),
                             true3dTransform ? properties().getZ() : 0.0f);
        } else {
            if (!true3dTransform) {
                matrix.multiply(*properties().getTransformMatrix());
            } else {
                mat4 true3dMat;
                true3dMat.loadTranslate(properties().getPivotX() + properties().getTranslationX(),
                                        properties().getPivotY() + properties().getTranslationY(),
                                        properties().getZ());
                true3dMat.rotate(properties().getRotationX(), 1, 0, 0);
                true3dMat.rotate(properties().getRotationY(), 0, 1, 0);
                true3dMat.rotate(properties().getRotation(), 0, 0, 1);
                true3dMat.scale(properties().getScaleX(), properties().getScaleY(), 1);
                true3dMat.translate(-properties().getPivotX(), -properties().getPivotY());

                matrix.multiply(true3dMat);
            }
        }
    }
}

/**
 * Organizes the DisplayList hierarchy to prepare for background projection reordering.
 *
 * This should be called before a call to defer() or drawDisplayList()
 *
 * Each DisplayList that serves as a 3d root builds its list of composited children,
 * which are flagged to not draw in the standard draw loop.
 */
void RenderNode::computeOrdering() {
    ATRACE_CALL();
    mProjectedNodes.clear();

    // TODO: create temporary DDLOp and call computeOrderingImpl on top DisplayList so that
    // transform properties are applied correctly to top level children
    if (mDisplayList == nullptr) return;
    for (unsigned int i = 0; i < mDisplayList->getChildren().size(); i++) {
        RenderNodeOp* childOp = mDisplayList->getChildren()[i];
        childOp->renderNode->computeOrderingImpl(childOp, &mProjectedNodes, &mat4::identity());
    }
}

void RenderNode::computeOrderingImpl(
        RenderNodeOp* opState, std::vector<RenderNodeOp*>* compositedChildrenOfProjectionSurface,
        const mat4* transformFromProjectionSurface) {
    mProjectedNodes.clear();
    if (mDisplayList == nullptr || mDisplayList->isEmpty()) return;

    // TODO: should avoid this calculation in most cases
    // TODO: just calculate single matrix, down to all leaf composited elements
    Matrix4 localTransformFromProjectionSurface(*transformFromProjectionSurface);
    localTransformFromProjectionSurface.multiply(opState->localMatrix);

    if (properties().getProjectBackwards()) {
        // composited projectee, flag for out of order draw, save matrix, and store in proj surface
        opState->skipInOrderDraw = true;
        opState->transformFromCompositingAncestor = localTransformFromProjectionSurface;
        compositedChildrenOfProjectionSurface->push_back(opState);
    } else {
        // standard in order draw
        opState->skipInOrderDraw = false;
    }

    if (mDisplayList->getChildren().size() > 0) {
        const bool isProjectionReceiver = mDisplayList->projectionReceiveIndex >= 0;
        bool haveAppliedPropertiesToProjection = false;
        for (unsigned int i = 0; i < mDisplayList->getChildren().size(); i++) {
            RenderNodeOp* childOp = mDisplayList->getChildren()[i];
            RenderNode* child = childOp->renderNode;

            std::vector<RenderNodeOp*>* projectionChildren = nullptr;
            const mat4* projectionTransform = nullptr;
            if (isProjectionReceiver && !child->properties().getProjectBackwards()) {
                // if receiving projections, collect projecting descendant

                // Note that if a direct descendant is projecting backwards, we pass its
                // grandparent projection collection, since it shouldn't project onto its
                // parent, where it will already be drawing.
                projectionChildren = &mProjectedNodes;
                projectionTransform = &mat4::identity();
            } else {
                if (!haveAppliedPropertiesToProjection) {
                    applyViewPropertyTransforms(localTransformFromProjectionSurface);
                    haveAppliedPropertiesToProjection = true;
                }
                projectionChildren = compositedChildrenOfProjectionSurface;
                projectionTransform = &localTransformFromProjectionSurface;
            }
            child->computeOrderingImpl(childOp, projectionChildren, projectionTransform);
        }
    }
}

const SkPath* RenderNode::getClippedOutline(const SkRect& clipRect) const {
    const SkPath* outlinePath = properties().getOutline().getPath();
    const uint32_t outlineID = outlinePath->getGenerationID();

    if (outlineID != mClippedOutlineCache.outlineID || clipRect != mClippedOutlineCache.clipRect) {
        // update the cache keys
        mClippedOutlineCache.outlineID = outlineID;
        mClippedOutlineCache.clipRect = clipRect;

        // update the cache value by recomputing a new path
        SkPath clipPath;
        clipPath.addRect(clipRect);
        Op(*outlinePath, clipPath, kIntersect_SkPathOp, &mClippedOutlineCache.clippedOutline);
    }
    return &mClippedOutlineCache.clippedOutline;
}

} /* namespace uirenderer */
} /* namespace android */