libs/hwui/LayerBuilder.cpp - platform/frameworks/base - Gitiles

 /*
  * 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 "LayerBuilder.h"

 #include "BakedOpState.h"
 #include "RenderNode.h"
 #include "utils/PaintUtils.h"
 #include "utils/TraceUtils.h"

 #include <utils/TypeHelpers.h>

 namespace android {
 namespace uirenderer {

 class BatchBase {
 public:
     BatchBase(batchid_t batchId, BakedOpState* op, bool merging)
             : mBatchId(batchId)
             , mMerging(merging) {
         mBounds = op->computedState.clippedBounds;
         mOps.push_back(op);
     }

     bool intersects(const Rect& rect) const {
         if (!rect.intersects(mBounds)) return false;

         for (const BakedOpState* op : mOps) {
             if (rect.intersects(op->computedState.clippedBounds)) {
                 return true;
             }
         }
         return false;
     }

     batchid_t getBatchId() const { return mBatchId; }
     bool isMerging() const { return mMerging; }

     const std::vector<BakedOpState*>& getOps() const { return mOps; }

     void dump() const {
         ALOGD("    Batch %p, id %d, merging %d, count %d, bounds " RECT_STRING,
                 this, mBatchId, mMerging, (int) mOps.size(), RECT_ARGS(mBounds));
     }
 protected:
     batchid_t mBatchId;
     Rect mBounds;
     std::vector<BakedOpState*> mOps;
     bool mMerging;
 };

 class OpBatch : public BatchBase {
 public:
     OpBatch(batchid_t batchId, BakedOpState* op)
             : BatchBase(batchId, op, false) {
     }

     void batchOp(BakedOpState* op) {
         mBounds.unionWith(op->computedState.clippedBounds);
         mOps.push_back(op);
     }
 };

 class MergingOpBatch : public BatchBase {
 public:
     MergingOpBatch(batchid_t batchId, BakedOpState* op)
             : BatchBase(batchId, op, true)
             , mClipSideFlags(op->computedState.clipSideFlags) {
     }

     /*
      * Helper for determining if a new op can merge with a MergingDrawBatch based on their bounds
      * and clip side flags. Positive bounds delta means new bounds fit in old.
      */
     static inline bool checkSide(const int currentFlags, const int newFlags, const int side,
             float boundsDelta) {
         bool currentClipExists = currentFlags & side;
         bool newClipExists = newFlags & side;

         // if current is clipped, we must be able to fit new bounds in current
         if (boundsDelta > 0 && currentClipExists) return false;

         // if new is clipped, we must be able to fit current bounds in new
         if (boundsDelta < 0 && newClipExists) return false;

         return true;
     }

     static bool paintIsDefault(const SkPaint& paint) {
         return paint.getAlpha() == 255
                 && paint.getColorFilter() == nullptr
                 && paint.getShader() == nullptr;
     }

     static bool paintsAreEquivalent(const SkPaint& a, const SkPaint& b) {
         // Note: don't check color, since all currently mergeable ops can merge across colors
         return a.getAlpha() == b.getAlpha()
                 && a.getColorFilter() == b.getColorFilter()
                 && a.getShader() == b.getShader();
     }

     /*
      * Checks if a (mergeable) op can be merged into this batch
      *
      * If true, the op's multiDraw must be guaranteed to handle both ops simultaneously, so it is
      * important to consider all paint attributes used in the draw calls in deciding both a) if an
      * op tries to merge at all, and b) if the op can merge with another set of ops
      *
      * False positives can lead to information from the paints of subsequent merged operations being
      * dropped, so we make simplifying qualifications on the ops that can merge, per op type.
      */
     bool canMergeWith(BakedOpState* op) const {
         bool isTextBatch = getBatchId() == OpBatchType::Text
                 || getBatchId() == OpBatchType::ColorText;

         // Overlapping other operations is only allowed for text without shadow. For other ops,
         // multiDraw isn't guaranteed to overdraw correctly
         if (!isTextBatch || PaintUtils::hasTextShadow(op->op->paint)) {
             if (intersects(op->computedState.clippedBounds)) return false;
         }

         const BakedOpState* lhs = op;
         const BakedOpState* rhs = mOps[0];

         if (!MathUtils::areEqual(lhs->alpha, rhs->alpha)) return false;

         // Identical round rect clip state means both ops will clip in the same way, or not at all.
         // As the state objects are const, we can compare their pointers to determine mergeability
         if (lhs->roundRectClipState != rhs->roundRectClipState) return false;
         if (lhs->projectionPathMask != rhs->projectionPathMask) return false;

         /* Clipping compatibility check
          *
          * Exploits the fact that if a op or batch is clipped on a side, its bounds will equal its
          * clip for that side.
          */
         const int currentFlags = mClipSideFlags;
         const int newFlags = op->computedState.clipSideFlags;
         if (currentFlags != OpClipSideFlags::None || newFlags != OpClipSideFlags::None) {
             const Rect& opBounds = op->computedState.clippedBounds;
             float boundsDelta = mBounds.left - opBounds.left;
             if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Left, boundsDelta)) return false;
             boundsDelta = mBounds.top - opBounds.top;
             if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Top, boundsDelta)) return false;

             // right and bottom delta calculation reversed to account for direction
             boundsDelta = opBounds.right - mBounds.right;
             if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Right, boundsDelta)) return false;
             boundsDelta = opBounds.bottom - mBounds.bottom;
             if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Bottom, boundsDelta)) return false;
         }

         const SkPaint* newPaint = op->op->paint;
         const SkPaint* oldPaint = mOps[0]->op->paint;

         if (newPaint == oldPaint) {
             // if paints are equal, then modifiers + paint attribs don't need to be compared
             return true;
         } else if (newPaint && !oldPaint) {
             return paintIsDefault(*newPaint);
         } else if (!newPaint && oldPaint) {
             return paintIsDefault(*oldPaint);
         }
         return paintsAreEquivalent(*newPaint, *oldPaint);
     }

     void mergeOp(BakedOpState* op) {
         mBounds.unionWith(op->computedState.clippedBounds);
         mOps.push_back(op);

         // Because a new op must have passed canMergeWith(), we know it's passed the clipping compat
         // check, and doesn't extend past a side of the clip that's in use by the merged batch.
         // Therefore it's safe to simply always merge flags, and use the bounds as the clip rect.
         mClipSideFlags |= op->computedState.clipSideFlags;
     }

     int getClipSideFlags() const { return mClipSideFlags; }
     const Rect& getClipRect() const { return mBounds; }

 private:
     int mClipSideFlags;
 };

 LayerBuilder::LayerBuilder(uint32_t width, uint32_t height,
         const Rect& repaintRect, const BeginLayerOp* beginLayerOp, RenderNode* renderNode)
         : width(width)
         , height(height)
         , repaintRect(repaintRect)
         , repaintClip(repaintRect)
         , offscreenBuffer(renderNode ? renderNode->getLayer() : nullptr)
         , beginLayerOp(beginLayerOp)
         , renderNode(renderNode) {}

 // iterate back toward target to see if anything drawn since should overlap the new op
 // if no target, merging ops still iterate to find similar batch to insert after
 void LayerBuilder::locateInsertIndex(int batchId, const Rect& clippedBounds,
         BatchBase** targetBatch, size_t* insertBatchIndex) const {
     for (int i = mBatches.size() - 1; i >= 0; i--) {
         BatchBase* overBatch = mBatches[i];

         if (overBatch == *targetBatch) break;

         // TODO: also consider shader shared between batch types
         if (batchId == overBatch->getBatchId()) {
             *insertBatchIndex = i + 1;
             if (!*targetBatch) break; // found insert position, quit
         }

         if (overBatch->intersects(clippedBounds)) {
             // NOTE: it may be possible to optimize for special cases where two operations
             // of the same batch/paint could swap order, such as with a non-mergeable
             // (clipped) and a mergeable text operation
             *targetBatch = nullptr;
             break;
         }
     }
 }

 void LayerBuilder::deferLayerClear(const Rect& rect) {
     mClearRects.push_back(rect);
 }

 void LayerBuilder::flushLayerClears(LinearAllocator& allocator) {
     if (CC_UNLIKELY(!mClearRects.empty())) {
         const int vertCount = mClearRects.size() * 4;
         // put the verts in the frame allocator, since
         //     1) SimpleRectsOps needs verts, not rects
         //     2) even if mClearRects stored verts, std::vectors will move their contents
         Vertex* const verts = (Vertex*) allocator.create_trivial_array<Vertex>(vertCount);

         Vertex* currentVert = verts;
         Rect bounds = mClearRects[0];
         for (auto&& rect : mClearRects) {
             bounds.unionWith(rect);
             Vertex::set(currentVert++, rect.left, rect.top);
             Vertex::set(currentVert++, rect.right, rect.top);
             Vertex::set(currentVert++, rect.left, rect.bottom);
             Vertex::set(currentVert++, rect.right, rect.bottom);
         }
         mClearRects.clear(); // discard rects before drawing so this method isn't reentrant

         // One or more unclipped saveLayers have been enqueued, with deferred clears.
         // Flush all of these clears with a single draw
         SkPaint* paint = allocator.create<SkPaint>();
         paint->setXfermodeMode(SkXfermode::kClear_Mode);
         SimpleRectsOp* op = allocator.create_trivial<SimpleRectsOp>(bounds,
                 Matrix4::identity(), nullptr, paint,
                 verts, vertCount);
         BakedOpState* bakedState = BakedOpState::directConstruct(allocator,
                 &repaintClip, bounds, *op);
         deferUnmergeableOp(allocator, bakedState, OpBatchType::Vertices);
     }
 }

 void LayerBuilder::deferUnmergeableOp(LinearAllocator& allocator,
         BakedOpState* op, batchid_t batchId) {
     if (batchId != OpBatchType::CopyToLayer) {
         // if first op after one or more unclipped saveLayers, flush the layer clears
         flushLayerClears(allocator);
     }

     OpBatch* targetBatch = mBatchLookup[batchId];

     size_t insertBatchIndex = mBatches.size();
     if (targetBatch) {
         locateInsertIndex(batchId, op->computedState.clippedBounds,
                 (BatchBase**)(&targetBatch), &insertBatchIndex);
     }

     if (targetBatch) {
         targetBatch->batchOp(op);
     } else  {
         // new non-merging batch
         targetBatch = allocator.create<OpBatch>(batchId, op);
         mBatchLookup[batchId] = targetBatch;
         mBatches.insert(mBatches.begin() + insertBatchIndex, targetBatch);
     }
 }

 void LayerBuilder::deferMergeableOp(LinearAllocator& allocator,
         BakedOpState* op, batchid_t batchId, mergeid_t mergeId) {
     if (batchId != OpBatchType::CopyToLayer) {
         // if first op after one or more unclipped saveLayers, flush the layer clears
         flushLayerClears(allocator);
     }
     MergingOpBatch* targetBatch = nullptr;

     // Try to merge with any existing batch with same mergeId
     auto getResult = mMergingBatchLookup[batchId].find(mergeId);
     if (getResult != mMergingBatchLookup[batchId].end()) {
         targetBatch = getResult->second;
         if (!targetBatch->canMergeWith(op)) {
             targetBatch = nullptr;
         }
     }

     size_t insertBatchIndex = mBatches.size();
     locateInsertIndex(batchId, op->computedState.clippedBounds,
             (BatchBase**)(&targetBatch), &insertBatchIndex);

     if (targetBatch) {
         targetBatch->mergeOp(op);
     } else  {
         // new merging batch
         targetBatch = allocator.create<MergingOpBatch>(batchId, op);
         mMergingBatchLookup[batchId].insert(std::make_pair(mergeId, targetBatch));

         mBatches.insert(mBatches.begin() + insertBatchIndex, targetBatch);
     }
 }

 void LayerBuilder::replayBakedOpsImpl(void* arg,
         BakedOpReceiver* unmergedReceivers, MergedOpReceiver* mergedReceivers) const {
     ATRACE_NAME("flush drawing commands");
     for (const BatchBase* batch : mBatches) {
         size_t size = batch->getOps().size();
         if (size > 1 && batch->isMerging()) {
             int opId = batch->getOps()[0]->op->opId;
             const MergingOpBatch* mergingBatch = static_cast<const MergingOpBatch*>(batch);
             MergedBakedOpList data = {
                     batch->getOps().data(),
                     size,
                     mergingBatch->getClipSideFlags(),
                     mergingBatch->getClipRect()
             };
             mergedReceivers[opId](arg, data);
         } else {
             for (const BakedOpState* op : batch->getOps()) {
                 unmergedReceivers[op->op->opId](arg, *op);
             }
         }
     }
 }

 void LayerBuilder::dump() const {
     ALOGD("LayerBuilder %p, %ux%u buffer %p, blo %p, rn %p",
             this, width, height, offscreenBuffer, beginLayerOp, renderNode);
     for (const BatchBase* batch : mBatches) {
         batch->dump();
     }
 }

 } // namespace uirenderer
 } // namespace android
	/*
	* 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 "LayerBuilder.h"

	#include "BakedOpState.h"
	#include "RenderNode.h"
	#include "utils/PaintUtils.h"
	#include "utils/TraceUtils.h"

	#include <utils/TypeHelpers.h>

	namespace android {
	namespace uirenderer {

	class BatchBase {
	public:
	BatchBase(batchid_t batchId, BakedOpState* op, bool merging)
	: mBatchId(batchId)
	, mMerging(merging) {
	mBounds = op->computedState.clippedBounds;
	mOps.push_back(op);
	}

	bool intersects(const Rect& rect) const {
	if (!rect.intersects(mBounds)) return false;

	for (const BakedOpState* op : mOps) {
	if (rect.intersects(op->computedState.clippedBounds)) {
	return true;
	}
	}
	return false;
	}

	batchid_t getBatchId() const { return mBatchId; }
	bool isMerging() const { return mMerging; }

	const std::vector<BakedOpState*>& getOps() const { return mOps; }

	void dump() const {
	ALOGD(" Batch %p, id %d, merging %d, count %d, bounds " RECT_STRING,
	this, mBatchId, mMerging, (int) mOps.size(), RECT_ARGS(mBounds));
	}
	protected:
	batchid_t mBatchId;
	Rect mBounds;
	std::vector<BakedOpState*> mOps;
	bool mMerging;
	};

	class OpBatch : public BatchBase {
	public:
	OpBatch(batchid_t batchId, BakedOpState* op)
	: BatchBase(batchId, op, false) {
	}

	void batchOp(BakedOpState* op) {
	mBounds.unionWith(op->computedState.clippedBounds);
	mOps.push_back(op);
	}
	};

	class MergingOpBatch : public BatchBase {
	public:
	MergingOpBatch(batchid_t batchId, BakedOpState* op)
	: BatchBase(batchId, op, true)
	, mClipSideFlags(op->computedState.clipSideFlags) {
	}

	/*
	* Helper for determining if a new op can merge with a MergingDrawBatch based on their bounds
	* and clip side flags. Positive bounds delta means new bounds fit in old.
	*/
	static inline bool checkSide(const int currentFlags, const int newFlags, const int side,
	float boundsDelta) {
	bool currentClipExists = currentFlags & side;
	bool newClipExists = newFlags & side;

	// if current is clipped, we must be able to fit new bounds in current
	if (boundsDelta > 0 && currentClipExists) return false;

	// if new is clipped, we must be able to fit current bounds in new
	if (boundsDelta < 0 && newClipExists) return false;

	return true;
	}

	static bool paintIsDefault(const SkPaint& paint) {
	return paint.getAlpha() == 255
	&& paint.getColorFilter() == nullptr
	&& paint.getShader() == nullptr;
	}

	static bool paintsAreEquivalent(const SkPaint& a, const SkPaint& b) {
	// Note: don't check color, since all currently mergeable ops can merge across colors
	return a.getAlpha() == b.getAlpha()
	&& a.getColorFilter() == b.getColorFilter()
	&& a.getShader() == b.getShader();
	}

	/*
	* Checks if a (mergeable) op can be merged into this batch
	*
	* If true, the op's multiDraw must be guaranteed to handle both ops simultaneously, so it is
	* important to consider all paint attributes used in the draw calls in deciding both a) if an
	* op tries to merge at all, and b) if the op can merge with another set of ops
	*
	* False positives can lead to information from the paints of subsequent merged operations being
	* dropped, so we make simplifying qualifications on the ops that can merge, per op type.
	*/
	bool canMergeWith(BakedOpState* op) const {
	bool isTextBatch = getBatchId() == OpBatchType::Text
	\|\| getBatchId() == OpBatchType::ColorText;

	// Overlapping other operations is only allowed for text without shadow. For other ops,
	// multiDraw isn't guaranteed to overdraw correctly
	if (!isTextBatch \|\| PaintUtils::hasTextShadow(op->op->paint)) {
	if (intersects(op->computedState.clippedBounds)) return false;
	}

	const BakedOpState* lhs = op;
	const BakedOpState* rhs = mOps[0];

	if (!MathUtils::areEqual(lhs->alpha, rhs->alpha)) return false;

	// Identical round rect clip state means both ops will clip in the same way, or not at all.
	// As the state objects are const, we can compare their pointers to determine mergeability
	if (lhs->roundRectClipState != rhs->roundRectClipState) return false;
	if (lhs->projectionPathMask != rhs->projectionPathMask) return false;

	/* Clipping compatibility check
	*
	* Exploits the fact that if a op or batch is clipped on a side, its bounds will equal its
	* clip for that side.
	*/
	const int currentFlags = mClipSideFlags;
	const int newFlags = op->computedState.clipSideFlags;
	if (currentFlags != OpClipSideFlags::None \|\| newFlags != OpClipSideFlags::None) {
	const Rect& opBounds = op->computedState.clippedBounds;
	float boundsDelta = mBounds.left - opBounds.left;
	if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Left, boundsDelta)) return false;
	boundsDelta = mBounds.top - opBounds.top;
	if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Top, boundsDelta)) return false;

	// right and bottom delta calculation reversed to account for direction
	boundsDelta = opBounds.right - mBounds.right;
	if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Right, boundsDelta)) return false;
	boundsDelta = opBounds.bottom - mBounds.bottom;
	if (!checkSide(currentFlags, newFlags, OpClipSideFlags::Bottom, boundsDelta)) return false;
	}

	const SkPaint* newPaint = op->op->paint;
	const SkPaint* oldPaint = mOps[0]->op->paint;

	if (newPaint == oldPaint) {
	// if paints are equal, then modifiers + paint attribs don't need to be compared
	return true;
	} else if (newPaint && !oldPaint) {
	return paintIsDefault(*newPaint);
	} else if (!newPaint && oldPaint) {
	return paintIsDefault(*oldPaint);
	}
	return paintsAreEquivalent(newPaint, oldPaint);
	}

	void mergeOp(BakedOpState* op) {
	mBounds.unionWith(op->computedState.clippedBounds);
	mOps.push_back(op);

	// Because a new op must have passed canMergeWith(), we know it's passed the clipping compat
	// check, and doesn't extend past a side of the clip that's in use by the merged batch.
	// Therefore it's safe to simply always merge flags, and use the bounds as the clip rect.
	mClipSideFlags \|= op->computedState.clipSideFlags;
	}

	int getClipSideFlags() const { return mClipSideFlags; }
	const Rect& getClipRect() const { return mBounds; }

	private:
	int mClipSideFlags;
	};

	LayerBuilder::LayerBuilder(uint32_t width, uint32_t height,
	const Rect& repaintRect, const BeginLayerOp* beginLayerOp, RenderNode* renderNode)
	: width(width)
	, height(height)
	, repaintRect(repaintRect)
	, repaintClip(repaintRect)
	, offscreenBuffer(renderNode ? renderNode->getLayer() : nullptr)
	, beginLayerOp(beginLayerOp)
	, renderNode(renderNode) {}

	// iterate back toward target to see if anything drawn since should overlap the new op
	// if no target, merging ops still iterate to find similar batch to insert after
	void LayerBuilder::locateInsertIndex(int batchId, const Rect& clippedBounds,
	BatchBase** targetBatch, size_t* insertBatchIndex) const {
	for (int i = mBatches.size() - 1; i >= 0; i--) {
	BatchBase* overBatch = mBatches[i];

	if (overBatch == *targetBatch) break;

	// TODO: also consider shader shared between batch types
	if (batchId == overBatch->getBatchId()) {
	*insertBatchIndex = i + 1;
	if (!*targetBatch) break; // found insert position, quit
	}

	if (overBatch->intersects(clippedBounds)) {
	// NOTE: it may be possible to optimize for special cases where two operations
	// of the same batch/paint could swap order, such as with a non-mergeable
	// (clipped) and a mergeable text operation
	*targetBatch = nullptr;
	break;
	}
	}
	}

	void LayerBuilder::deferLayerClear(const Rect& rect) {
	mClearRects.push_back(rect);
	}

	void LayerBuilder::flushLayerClears(LinearAllocator& allocator) {
	if (CC_UNLIKELY(!mClearRects.empty())) {
	const int vertCount = mClearRects.size() * 4;
	// put the verts in the frame allocator, since
	// 1) SimpleRectsOps needs verts, not rects
	// 2) even if mClearRects stored verts, std::vectors will move their contents
	Vertex* const verts = (Vertex*) allocator.create_trivial_array<Vertex>(vertCount);

	Vertex* currentVert = verts;
	Rect bounds = mClearRects[0];
	for (auto&& rect : mClearRects) {
	bounds.unionWith(rect);
	Vertex::set(currentVert++, rect.left, rect.top);
	Vertex::set(currentVert++, rect.right, rect.top);
	Vertex::set(currentVert++, rect.left, rect.bottom);
	Vertex::set(currentVert++, rect.right, rect.bottom);
	}
	mClearRects.clear(); // discard rects before drawing so this method isn't reentrant

	// One or more unclipped saveLayers have been enqueued, with deferred clears.
	// Flush all of these clears with a single draw
	SkPaint* paint = allocator.create<SkPaint>();
	paint->setXfermodeMode(SkXfermode::kClear_Mode);
	SimpleRectsOp* op = allocator.create_trivial<SimpleRectsOp>(bounds,
	Matrix4::identity(), nullptr, paint,
	verts, vertCount);
	BakedOpState* bakedState = BakedOpState::directConstruct(allocator,
	&repaintClip, bounds, *op);
	deferUnmergeableOp(allocator, bakedState, OpBatchType::Vertices);
	}
	}

	void LayerBuilder::deferUnmergeableOp(LinearAllocator& allocator,
	BakedOpState* op, batchid_t batchId) {
	if (batchId != OpBatchType::CopyToLayer) {
	// if first op after one or more unclipped saveLayers, flush the layer clears
	flushLayerClears(allocator);
	}

	OpBatch* targetBatch = mBatchLookup[batchId];

	size_t insertBatchIndex = mBatches.size();
	if (targetBatch) {
	locateInsertIndex(batchId, op->computedState.clippedBounds,
	(BatchBase**)(&targetBatch), &insertBatchIndex);
	}

	if (targetBatch) {
	targetBatch->batchOp(op);
	} else {
	// new non-merging batch
	targetBatch = allocator.create<OpBatch>(batchId, op);
	mBatchLookup[batchId] = targetBatch;
	mBatches.insert(mBatches.begin() + insertBatchIndex, targetBatch);
	}
	}

	void LayerBuilder::deferMergeableOp(LinearAllocator& allocator,
	BakedOpState* op, batchid_t batchId, mergeid_t mergeId) {
	if (batchId != OpBatchType::CopyToLayer) {
	// if first op after one or more unclipped saveLayers, flush the layer clears
	flushLayerClears(allocator);
	}
	MergingOpBatch* targetBatch = nullptr;

	// Try to merge with any existing batch with same mergeId
	auto getResult = mMergingBatchLookup[batchId].find(mergeId);
	if (getResult != mMergingBatchLookup[batchId].end()) {
	targetBatch = getResult->second;
	if (!targetBatch->canMergeWith(op)) {
	targetBatch = nullptr;
	}
	}

	size_t insertBatchIndex = mBatches.size();
	locateInsertIndex(batchId, op->computedState.clippedBounds,
	(BatchBase**)(&targetBatch), &insertBatchIndex);

	if (targetBatch) {
	targetBatch->mergeOp(op);
	} else {
	// new merging batch
	targetBatch = allocator.create<MergingOpBatch>(batchId, op);
	mMergingBatchLookup[batchId].insert(std::make_pair(mergeId, targetBatch));

	mBatches.insert(mBatches.begin() + insertBatchIndex, targetBatch);
	}
	}

	void LayerBuilder::replayBakedOpsImpl(void* arg,
	BakedOpReceiver* unmergedReceivers, MergedOpReceiver* mergedReceivers) const {
	ATRACE_NAME("flush drawing commands");
	for (const BatchBase* batch : mBatches) {
	size_t size = batch->getOps().size();
	if (size > 1 && batch->isMerging()) {
	int opId = batch->getOps()[0]->op->opId;
	const MergingOpBatch* mergingBatch = static_cast<const MergingOpBatch*>(batch);
	MergedBakedOpList data = {
	batch->getOps().data(),
	size,
	mergingBatch->getClipSideFlags(),
	mergingBatch->getClipRect()
	};
	mergedReceivers[opId](arg, data);
	} else {
	for (const BakedOpState* op : batch->getOps()) {
	unmergedReceivers[op->op->opId](arg, *op);
	}
	}
	}
	}

	void LayerBuilder::dump() const {
	ALOGD("LayerBuilder %p, %ux%u buffer %p, blo %p, rn %p",
	this, width, height, offscreenBuffer, beginLayerOp, renderNode);
	for (const BatchBase* batch : mBatches) {
	batch->dump();
	}
	}

	} // namespace uirenderer
	} // namespace android