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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "SkiaDisplayList.h"
     18 
     19 #include "DumpOpsCanvas.h"
     20 #include "SkiaPipeline.h"
     21 #include "VectorDrawable.h"
     22 #include "renderthread/CanvasContext.h"
     23 
     24 #include <SkImagePriv.h>
     25 
     26 namespace android {
     27 namespace uirenderer {
     28 namespace skiapipeline {
     29 
     30 void SkiaDisplayList::syncContents() {
     31     for (auto& functor : mChildFunctors) {
     32         functor.syncFunctor();
     33     }
     34     for (auto& animatedImage : mAnimatedImages) {
     35         animatedImage->syncProperties();
     36     }
     37     for (auto& vectorDrawable : mVectorDrawables) {
     38         vectorDrawable->syncProperties();
     39     }
     40 }
     41 
     42 bool SkiaDisplayList::reuseDisplayList(RenderNode* node, renderthread::CanvasContext* context) {
     43     reset();
     44     node->attachAvailableList(this);
     45     return true;
     46 }
     47 
     48 void SkiaDisplayList::updateChildren(std::function<void(RenderNode*)> updateFn) {
     49     for (auto& child : mChildNodes) {
     50         updateFn(child.getRenderNode());
     51     }
     52 }
     53 
     54 bool SkiaDisplayList::prepareListAndChildren(
     55         TreeObserver& observer, TreeInfo& info, bool functorsNeedLayer,
     56         std::function<void(RenderNode*, TreeObserver&, TreeInfo&, bool)> childFn) {
     57     // If the prepare tree is triggered by the UI thread and no previous call to
     58     // pinImages has failed then we must pin all mutable images in the GPU cache
     59     // until the next UI thread draw.
     60     if (info.prepareTextures && !info.canvasContext.pinImages(mMutableImages)) {
     61         // In the event that pinning failed we prevent future pinImage calls for the
     62         // remainder of this tree traversal and also unpin any currently pinned images
     63         // to free up GPU resources.
     64         info.prepareTextures = false;
     65         info.canvasContext.unpinImages();
     66     }
     67 
     68     bool hasBackwardProjectedNodesHere = false;
     69     bool hasBackwardProjectedNodesSubtree = false;
     70 
     71     for (auto& child : mChildNodes) {
     72         hasBackwardProjectedNodesHere |= child.getNodeProperties().getProjectBackwards();
     73         RenderNode* childNode = child.getRenderNode();
     74         Matrix4 mat4(child.getRecordedMatrix());
     75         info.damageAccumulator->pushTransform(&mat4);
     76         // TODO: a layer is needed if the canvas is rotated or has a non-rect clip
     77         info.hasBackwardProjectedNodes = false;
     78         childFn(childNode, observer, info, functorsNeedLayer);
     79         hasBackwardProjectedNodesSubtree |= info.hasBackwardProjectedNodes;
     80         info.damageAccumulator->popTransform();
     81     }
     82 
     83     // The purpose of next block of code is to reset projected display list if there are no
     84     // backward projected nodes. This speeds up drawing, by avoiding an extra walk of the tree
     85     if (mProjectionReceiver) {
     86         mProjectionReceiver->setProjectedDisplayList(hasBackwardProjectedNodesSubtree ? this
     87                                                                                       : nullptr);
     88         info.hasBackwardProjectedNodes = hasBackwardProjectedNodesHere;
     89     } else {
     90         info.hasBackwardProjectedNodes =
     91                 hasBackwardProjectedNodesSubtree || hasBackwardProjectedNodesHere;
     92     }
     93 
     94     bool isDirty = false;
     95     for (auto& animatedImage : mAnimatedImages) {
     96         nsecs_t timeTilNextFrame = TreeInfo::Out::kNoAnimatedImageDelay;
     97         // If any animated image in the display list needs updated, then damage the node.
     98         if (animatedImage->isDirty(&timeTilNextFrame)) {
     99             isDirty = true;
    100         }
    101 
    102         if (animatedImage->isRunning() &&
    103             timeTilNextFrame != TreeInfo::Out::kNoAnimatedImageDelay) {
    104             auto& delay = info.out.animatedImageDelay;
    105             if (delay == TreeInfo::Out::kNoAnimatedImageDelay || timeTilNextFrame < delay) {
    106                 delay = timeTilNextFrame;
    107             }
    108         }
    109     }
    110 
    111     for (auto& vectorDrawable : mVectorDrawables) {
    112         // If any vector drawable in the display list needs update, damage the node.
    113         if (vectorDrawable->isDirty()) {
    114             isDirty = true;
    115             static_cast<SkiaPipeline*>(info.canvasContext.getRenderPipeline())
    116                     ->getVectorDrawables()
    117                     ->push_back(vectorDrawable);
    118         }
    119         vectorDrawable->setPropertyChangeWillBeConsumed(true);
    120     }
    121     return isDirty;
    122 }
    123 
    124 void SkiaDisplayList::reset() {
    125     mProjectionReceiver = nullptr;
    126 
    127     mDisplayList.reset();
    128 
    129     mMutableImages.clear();
    130     mVectorDrawables.clear();
    131     mAnimatedImages.clear();
    132     mChildFunctors.clear();
    133     mChildNodes.clear();
    134 
    135     projectionReceiveIndex = -1;
    136     allocator.~LinearAllocator();
    137     new (&allocator) LinearAllocator();
    138 }
    139 
    140 void SkiaDisplayList::output(std::ostream& output, uint32_t level) {
    141     DumpOpsCanvas canvas(output, level, *this);
    142     mDisplayList.draw(&canvas);
    143 }
    144 
    145 };  // namespace skiapipeline
    146 };  // namespace uirenderer
    147 };  // namespace android
    148