322 lines
11 KiB
C++
322 lines
11 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "DamageAccumulator.h"
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#include <log/log.h>
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#include "RenderNode.h"
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#include "utils/MathUtils.h"
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namespace android {
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namespace uirenderer {
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enum TransformType {
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TransformInvalid = 0,
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TransformRenderNode,
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TransformMatrix4,
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TransformNone,
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};
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struct DirtyStack {
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TransformType type;
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union {
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const RenderNode* renderNode;
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const Matrix4* matrix4;
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};
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// When this frame is pop'd, this rect is mapped through the above transform
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// and applied to the previous (aka parent) frame
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SkRect pendingDirty;
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DirtyStack* prev;
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DirtyStack* next;
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};
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DamageAccumulator::DamageAccumulator() {
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mHead = mAllocator.create_trivial<DirtyStack>();
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memset(mHead, 0, sizeof(DirtyStack));
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// Create a root that we will not pop off
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mHead->prev = mHead;
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mHead->type = TransformNone;
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}
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static void computeTransformImpl(const DirtyStack* currentFrame, Matrix4* outMatrix) {
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if (currentFrame->prev != currentFrame) {
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computeTransformImpl(currentFrame->prev, outMatrix);
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}
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switch (currentFrame->type) {
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case TransformRenderNode:
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currentFrame->renderNode->applyViewPropertyTransforms(*outMatrix);
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break;
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case TransformMatrix4:
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outMatrix->multiply(*currentFrame->matrix4);
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break;
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case TransformNone:
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// nothing to be done
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break;
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default:
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LOG_ALWAYS_FATAL("Tried to compute transform with an invalid type: %d",
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currentFrame->type);
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}
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}
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void DamageAccumulator::computeCurrentTransform(Matrix4* outMatrix) const {
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outMatrix->loadIdentity();
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computeTransformImpl(mHead, outMatrix);
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}
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void DamageAccumulator::pushCommon() {
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if (!mHead->next) {
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DirtyStack* nextFrame = mAllocator.create_trivial<DirtyStack>();
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nextFrame->next = nullptr;
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nextFrame->prev = mHead;
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mHead->next = nextFrame;
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}
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mHead = mHead->next;
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mHead->pendingDirty.setEmpty();
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}
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void DamageAccumulator::pushTransform(const RenderNode* transform) {
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pushCommon();
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mHead->type = TransformRenderNode;
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mHead->renderNode = transform;
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}
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void DamageAccumulator::pushTransform(const Matrix4* transform) {
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pushCommon();
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mHead->type = TransformMatrix4;
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mHead->matrix4 = transform;
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}
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void DamageAccumulator::popTransform() {
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LOG_ALWAYS_FATAL_IF(mHead->prev == mHead, "Cannot pop the root frame!");
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DirtyStack* dirtyFrame = mHead;
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mHead = mHead->prev;
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switch (dirtyFrame->type) {
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case TransformRenderNode:
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applyRenderNodeTransform(dirtyFrame);
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break;
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case TransformMatrix4:
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applyMatrix4Transform(dirtyFrame);
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break;
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case TransformNone:
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mHead->pendingDirty.join(dirtyFrame->pendingDirty);
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break;
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default:
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LOG_ALWAYS_FATAL("Tried to pop an invalid type: %d", dirtyFrame->type);
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}
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}
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static inline void mapRect(const Matrix4* matrix, const SkRect& in, SkRect* out) {
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if (in.isEmpty()) return;
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Rect temp(in);
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if (CC_LIKELY(!matrix->isPerspective())) {
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matrix->mapRect(temp);
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} else {
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// Don't attempt to calculate damage for a perspective transform
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// as the numbers this works with can break the perspective
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// calculations. Just give up and expand to DIRTY_MIN/DIRTY_MAX
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temp.set(DIRTY_MIN, DIRTY_MIN, DIRTY_MAX, DIRTY_MAX);
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}
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out->join({RECT_ARGS(temp)});
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}
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void DamageAccumulator::applyMatrix4Transform(DirtyStack* frame) {
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mapRect(frame->matrix4, frame->pendingDirty, &mHead->pendingDirty);
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}
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static inline void applyMatrix(const SkMatrix* transform, SkRect* rect) {
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if (transform && !transform->isIdentity()) {
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if (CC_LIKELY(!transform->hasPerspective())) {
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transform->mapRect(rect);
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} else {
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// Don't attempt to calculate damage for a perspective transform
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// as the numbers this works with can break the perspective
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// calculations. Just give up and expand to DIRTY_MIN/DIRTY_MAX
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rect->setLTRB(DIRTY_MIN, DIRTY_MIN, DIRTY_MAX, DIRTY_MAX);
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}
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}
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}
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static inline void applyMatrix(const SkMatrix& transform, SkRect* rect) {
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return applyMatrix(&transform, rect);
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}
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static inline void mapRect(const RenderProperties& props, const SkRect& in, SkRect* out) {
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if (in.isEmpty()) return;
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SkRect temp(in);
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if (Properties::getStretchEffectBehavior() == StretchEffectBehavior::UniformScale) {
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const StretchEffect& stretch = props.layerProperties().getStretchEffect();
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if (!stretch.isEmpty()) {
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applyMatrix(stretch.makeLinearStretch(props.getWidth(), props.getHeight()), &temp);
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}
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}
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applyMatrix(props.getTransformMatrix(), &temp);
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if (props.getStaticMatrix()) {
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applyMatrix(props.getStaticMatrix(), &temp);
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} else if (props.getAnimationMatrix()) {
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applyMatrix(props.getAnimationMatrix(), &temp);
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}
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temp.offset(props.getLeft(), props.getTop());
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out->join(temp);
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}
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static DirtyStack* findParentRenderNode(DirtyStack* frame) {
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while (frame->prev != frame) {
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frame = frame->prev;
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if (frame->type == TransformRenderNode) {
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return frame;
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}
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}
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return nullptr;
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}
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static DirtyStack* findProjectionReceiver(DirtyStack* frame) {
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if (frame) {
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while (frame->prev != frame) {
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frame = frame->prev;
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if (frame->type == TransformRenderNode && frame->renderNode->hasProjectionReceiver()) {
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return frame;
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}
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}
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}
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return nullptr;
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}
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static void applyTransforms(DirtyStack* frame, DirtyStack* end) {
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SkRect* rect = &frame->pendingDirty;
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while (frame != end) {
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if (frame->type == TransformRenderNode) {
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mapRect(frame->renderNode->properties(), *rect, rect);
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} else {
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mapRect(frame->matrix4, *rect, rect);
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}
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frame = frame->prev;
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}
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}
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static void computeTransformImpl(const DirtyStack* frame, const DirtyStack* end,
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Matrix4* outMatrix) {
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while (frame != end) {
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switch (frame->type) {
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case TransformRenderNode:
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frame->renderNode->applyViewPropertyTransforms(*outMatrix);
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break;
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case TransformMatrix4:
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outMatrix->multiply(*frame->matrix4);
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break;
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case TransformNone:
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// nothing to be done
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break;
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default:
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LOG_ALWAYS_FATAL("Tried to compute transform with an invalid type: %d",
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frame->type);
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}
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frame = frame->prev;
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}
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}
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void DamageAccumulator::applyRenderNodeTransform(DirtyStack* frame) {
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if (frame->pendingDirty.isEmpty()) {
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return;
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}
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const RenderProperties& props = frame->renderNode->properties();
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if (props.getAlpha() <= 0) {
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return;
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}
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// Perform clipping
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if (props.getClipDamageToBounds() && !frame->pendingDirty.isEmpty()) {
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if (!frame->pendingDirty.intersect(SkRect::MakeIWH(props.getWidth(), props.getHeight()))) {
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frame->pendingDirty.setEmpty();
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}
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}
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// apply all transforms
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mapRect(props, frame->pendingDirty, &mHead->pendingDirty);
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// project backwards if necessary
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if (props.getProjectBackwards() && !frame->pendingDirty.isEmpty()) {
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// First, find our parent RenderNode:
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DirtyStack* parentNode = findParentRenderNode(frame);
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// Find our parent's projection receiver, which is what we project onto
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DirtyStack* projectionReceiver = findProjectionReceiver(parentNode);
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if (projectionReceiver) {
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applyTransforms(frame, projectionReceiver);
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projectionReceiver->pendingDirty.join(frame->pendingDirty);
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}
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frame->pendingDirty.setEmpty();
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}
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}
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void DamageAccumulator::dirty(float left, float top, float right, float bottom) {
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mHead->pendingDirty.join({left, top, right, bottom});
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}
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void DamageAccumulator::peekAtDirty(SkRect* dest) const {
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*dest = mHead->pendingDirty;
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}
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void DamageAccumulator::finish(SkRect* totalDirty) {
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LOG_ALWAYS_FATAL_IF(mHead->prev != mHead, "Cannot finish, mismatched push/pop calls! %p vs. %p",
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mHead->prev, mHead);
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// Root node never has a transform, so this is the fully mapped dirty rect
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*totalDirty = mHead->pendingDirty;
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totalDirty->roundOut(totalDirty);
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mHead->pendingDirty.setEmpty();
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}
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DamageAccumulator::StretchResult DamageAccumulator::findNearestStretchEffect() const {
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DirtyStack* frame = mHead;
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const auto& headProperties = mHead->renderNode->properties();
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float startWidth = headProperties.getWidth();
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float startHeight = headProperties.getHeight();
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while (frame->prev != frame) {
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if (frame->type == TransformRenderNode) {
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const auto& renderNode = frame->renderNode;
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const auto& frameRenderNodeProperties = renderNode->properties();
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const auto& effect =
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frameRenderNodeProperties.layerProperties().getStretchEffect();
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const float width = (float) frameRenderNodeProperties.getWidth();
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const float height = (float) frameRenderNodeProperties.getHeight();
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if (!effect.isEmpty()) {
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Matrix4 stretchMatrix;
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computeTransformImpl(mHead, frame, &stretchMatrix);
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Rect stretchRect = Rect(0.f, 0.f, startWidth, startHeight);
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stretchMatrix.mapRect(stretchRect);
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return StretchResult{
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.stretchEffect = &effect,
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.childRelativeBounds = SkRect::MakeLTRB(
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stretchRect.left,
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stretchRect.top,
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stretchRect.right,
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stretchRect.bottom
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),
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.width = width,
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.height = height
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};
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}
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}
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frame = frame->prev;
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}
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return StretchResult{};
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}
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} /* namespace uirenderer */
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} /* namespace android */
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