src/gpu/GrPictureUtils.cpp - platform/external/skqp - Gitiles

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrPictureUtils.h"

 #include "SkPaintPriv.h"
 #include "SkPatchUtils.h"
 #include "SkRecord.h"
 #include "SkRecords.h"

 SkPicture::AccelData::Key GrAccelData::ComputeAccelDataKey() {
     static const SkPicture::AccelData::Key gGPUID = SkPicture::AccelData::GenerateDomain();

     return gGPUID;
 }

 // This looks silly, I know.  Why not just use SkRect::MakeLargest()?
 // In practice, this is well large enough, and it has a few extra advantages:
 // it fits in an SkIRect, and we can munge it a little in both SkRect and
 // SKIRect space without worrying about overflow.
 static const SkRect kUnbounded = { -2e9f, -2e9f, 2e9f, 2e9f };

 namespace SkRecords {

 // SkRecord visitor to gather saveLayer/restore information.
 class CollectLayers : SkNoncopyable {
 public:
     CollectLayers(const SkPicture* pict, GrAccelData* accelData)
         : fPictureID(pict->uniqueID())
         , fSaveLayersInStack(0)
         , fAccelData(accelData) {

         // Calculate bounds for all ops.  This won't go quite in order, so we'll need
         // to store the bounds separately then feed them in to the BBH later in order.
         fCTM = &SkMatrix::I();
         fCurrentClipBounds = kUnbounded;

         if (NULL == pict->fRecord.get()) {
             return;
         }

         fBounds.reset(pict->fRecord->count());

         for (fCurrentOp = 0; fCurrentOp < pict->fRecord->count(); ++fCurrentOp) {
             pict->fRecord->visit<void>(fCurrentOp, *this);
         }

         // If we have any lingering unpaired Saves, simulate restores to make
         // sure all ops in those Save blocks have their bounds calculated.
         while (!fSaveStack.isEmpty()) {
             this->popSaveBlock();
         }

         // Any control ops not part of any Save/Restore block draw everywhere.
         while (!fControlIndices.isEmpty()) {
             this->popControl(kUnbounded);
         }

         //--------- LAYER HOISTING
         while (!fSaveLayerStack.isEmpty()) {
             this->popSaveLayerInfo();
         }
         //--------- LAYER HOISTING
     }

     template <typename T> void operator()(const T& op) {
         this->updateCTM(op);
         this->updateClipBounds(op);
         this->trackBounds(op);
         //--------- LAYER HOISTING
         this->trackSaveLayers(op);
         //--------- LAYER HOISTING
     }

 private:
     // In this file, SkRect are in local coordinates, Bounds are translated back to identity space.
     typedef SkRect Bounds;

     struct SaveBounds {
         int controlOps;        // Number of control ops in this Save block, including the Save.
         Bounds bounds;         // Bounds of everything in the block.
         const SkPaint* paint;  // Unowned.  If set, adjusts the bounds of all ops in this block.
     };

     //--------- LAYER HOISTING
     class SaveLayerInfo {
     public:
         SaveLayerInfo() { }
         SaveLayerInfo(int opIndex, bool isSaveLayer, const SkPaint* paint, const Bounds& clipBound)
             : fStartIndex(opIndex)
             , fIsSaveLayer(isSaveLayer)
             , fHasNestedSaveLayer(false)
             , fPaint(paint)
             , fClipBound(clipBound) {
         }

         int            fStartIndex;
         bool           fIsSaveLayer;
         bool           fHasNestedSaveLayer;
         const SkPaint* fPaint;
         Bounds         fClipBound;
     };
     //--------- LAYER HOISTING

     // Only Restore and SetMatrix change the CTM.
     template <typename T> void updateCTM(const T&) {}
     void updateCTM(const Restore& op)   { fCTM = &op.matrix; }
     void updateCTM(const SetMatrix& op) { fCTM = &op.matrix; }

     // Most ops don't change the clip.
     template <typename T> void updateClipBounds(const T&) {}

     // Clip{Path,RRect,Rect,Region} obviously change the clip.  They all know their bounds already.
     void updateClipBounds(const ClipPath& op)   { this->updateClipBoundsForClipOp(op.devBounds); }
     void updateClipBounds(const ClipRRect& op)  { this->updateClipBoundsForClipOp(op.devBounds); }
     void updateClipBounds(const ClipRect& op)   { this->updateClipBoundsForClipOp(op.devBounds); }
     void updateClipBounds(const ClipRegion& op) { this->updateClipBoundsForClipOp(op.devBounds); }

     // The bounds of clip ops need to be adjusted for the paints of saveLayers they're inside.
     void updateClipBoundsForClipOp(const SkIRect& devBounds) {
         Bounds clip = SkRect::Make(devBounds);
         // We don't call adjustAndMap() because as its last step it would intersect the adjusted
         // clip bounds with the previous clip, exactly what we can't do when the clip grows.
         fCurrentClipBounds = this->adjustForSaveLayerPaints(&clip) ? clip : kUnbounded;
     }

     // Restore holds the devBounds for the clip after the {save,saveLayer}/restore block completes.
     void updateClipBounds(const Restore& op) {
         // This is just like the clip ops above, but we need to skip the effects (if any) of our
         // paired saveLayer (if it is one); it has not yet been popped off the save stack.  Our
         // devBounds reflect the state of the world after the saveLayer/restore block is done,
         // so they are not affected by the saveLayer's paint.
         const int kSavesToIgnore = 1;
         Bounds clip = SkRect::Make(op.devBounds);
         fCurrentClipBounds =
             this->adjustForSaveLayerPaints(&clip, kSavesToIgnore) ? clip : kUnbounded;
     }

     // We also take advantage of SaveLayer bounds when present to further cut the clip down.
     void updateClipBounds(const SaveLayer& op)  {
         if (op.bounds) {
             // adjustAndMap() intersects these layer bounds with the previous clip for us.
             fCurrentClipBounds = this->adjustAndMap(*op.bounds, op.paint);
         }
     }

     // The bounds of these ops must be calculated when we hit the Restore
     // from the bounds of the ops in the same Save block.
     void trackBounds(const Save&)          { this->pushSaveBlock(NULL); }
     void trackBounds(const SaveLayer& op)  { this->pushSaveBlock(op.paint); }
     void trackBounds(const Restore&) { fBounds[fCurrentOp] = this->popSaveBlock(); }

     void trackBounds(const SetMatrix&)         { this->pushControl(); }
     void trackBounds(const ClipRect&)          { this->pushControl(); }
     void trackBounds(const ClipRRect&)         { this->pushControl(); }
     void trackBounds(const ClipPath&)          { this->pushControl(); }
     void trackBounds(const ClipRegion&)        { this->pushControl(); }
     void trackBounds(const PushCull&)          { this->pushControl(); }
     void trackBounds(const PopCull&)           { this->pushControl(); }
     void trackBounds(const BeginCommentGroup&) { this->pushControl(); }
     void trackBounds(const AddComment&)        { this->pushControl(); }
     void trackBounds(const EndCommentGroup&)   { this->pushControl(); }
     void trackBounds(const DrawData&)          { this->pushControl(); }

     // For all other ops, we can calculate and store the bounds directly now.
     template <typename T> void trackBounds(const T& op) {
         fBounds[fCurrentOp] = this->bounds(op);
         this->updateSaveBounds(fBounds[fCurrentOp]);
     }

     void pushSaveBlock(const SkPaint* paint) {
         // Starting a new Save block.  Push a new entry to represent that.
         SaveBounds sb = { 0, Bounds::MakeEmpty(), paint };
         fSaveStack.push(sb);
         this->pushControl();
     }

     static bool PaintMayAffectTransparentBlack(const SkPaint* paint) {
         if (paint) {
             // FIXME: this is very conservative
             if (paint->getImageFilter() || paint->getColorFilter()) {
                 return true;
             }

             // Unusual Xfermodes require us to process a saved layer
             // even with operations outisde the clip.
             // For example, DstIn is used by masking layers.
             // https://code.google.com/p/skia/issues/detail?id=1291
             // https://crbug.com/401593
             SkXfermode* xfermode = paint->getXfermode();
             SkXfermode::Mode mode;
             // SrcOver is ok, and is also the common case with a NULL xfermode.
             // So we should make that the fast path and bypass the mode extraction
             // and test.
             if (xfermode && xfermode->asMode(&mode)) {
                 switch (mode) {
                     // For each of the following transfer modes, if the source
                     // alpha is zero (our transparent black), the resulting
                     // blended alpha is not necessarily equal to the original
                     // destination alpha.
                     case SkXfermode::kClear_Mode:
                     case SkXfermode::kSrc_Mode:
                     case SkXfermode::kSrcIn_Mode:
                     case SkXfermode::kDstIn_Mode:
                     case SkXfermode::kSrcOut_Mode:
                     case SkXfermode::kDstATop_Mode:
                     case SkXfermode::kModulate_Mode:
                         return true;
                         break;
                     default:
                         break;
                 }
             }
         }
         return false;
     }

     Bounds popSaveBlock() {
         // We're done the Save block.  Apply the block's bounds to all control ops inside it.
         SaveBounds sb;
         fSaveStack.pop(&sb);

         // If the paint affects transparent black, we can't trust any of our calculated bounds.
         const Bounds& bounds =
             PaintMayAffectTransparentBlack(sb.paint) ? fCurrentClipBounds : sb.bounds;

         while (sb.controlOps-- > 0) {
             this->popControl(bounds);
         }

         // This whole Save block may be part another Save block.
         this->updateSaveBounds(bounds);

         // If called from a real Restore (not a phony one for balance), it'll need the bounds.
         return bounds;
     }

     void pushControl() {
         fControlIndices.push(fCurrentOp);
         if (!fSaveStack.isEmpty()) {
             fSaveStack.top().controlOps++;
         }
     }

     void popControl(const Bounds& bounds) {
         fBounds[fControlIndices.top()] = bounds;
         fControlIndices.pop();
     }

     void updateSaveBounds(const Bounds& bounds) {
         // If we're in a Save block, expand its bounds to cover these bounds too.
         if (!fSaveStack.isEmpty()) {
             fSaveStack.top().bounds.join(bounds);
         }
     }

     // FIXME: this method could use better bounds
     Bounds bounds(const DrawText&) const { return fCurrentClipBounds; }

     Bounds bounds(const Clear&) const { return kUnbounded; }             // Ignores the clip.
     Bounds bounds(const DrawPaint&) const { return fCurrentClipBounds; }
     Bounds bounds(const NoOp&)  const { return Bounds::MakeEmpty(); }    // NoOps don't draw.

     Bounds bounds(const DrawSprite& op) const {
         const SkBitmap& bm = op.bitmap;

         return Bounds::Make(SkIRect::MakeXYWH(op.left, op.top, bm.width(), bm.height()));  // Ignores the matrix.
     }

     Bounds bounds(const DrawRect& op) const { return this->adjustAndMap(op.rect, &op.paint); }
     Bounds bounds(const DrawOval& op) const { return this->adjustAndMap(op.oval, &op.paint); }
     Bounds bounds(const DrawRRect& op) const {
         return this->adjustAndMap(op.rrect.rect(), &op.paint);
     }
     Bounds bounds(const DrawDRRect& op) const {
         return this->adjustAndMap(op.outer.rect(), &op.paint);
     }
     Bounds bounds(const DrawImage& op) const {
         const SkImage* image = op.image;
         SkRect rect = SkRect::MakeXYWH(op.left, op.top,
                                         SkIntToScalar(image->width()), SkIntToScalar(image->height()));

         return this->adjustAndMap(rect, op.paint);
     }
     Bounds bounds(const DrawImageRect& op) const {
         return this->adjustAndMap(op.dst, op.paint);
     }
     Bounds bounds(const DrawBitmapRectToRect& op) const {
         return this->adjustAndMap(op.dst, op.paint);
     }
     Bounds bounds(const DrawBitmapNine& op) const {
         return this->adjustAndMap(op.dst, op.paint);
     }
     Bounds bounds(const DrawBitmap& op) const {
         const SkBitmap& bm = op.bitmap;
         return this->adjustAndMap(SkRect::MakeXYWH(op.left, op.top, SkIntToScalar(bm.width()), SkIntToScalar(bm.height())),
                                     op.paint);
     }
     Bounds bounds(const DrawBitmapMatrix& op) const {
         const SkBitmap& bm = op.bitmap;
         SkRect dst = SkRect::Make(SkIRect::MakeWH(bm.width(), bm.height()));
         op.matrix.mapRect(&dst);
         return this->adjustAndMap(dst, op.paint);
     }

     Bounds bounds(const DrawPath& op) const {
         return op.path.isInverseFillType() ? fCurrentClipBounds
             : this->adjustAndMap(op.path.getBounds(), &op.paint);
     }
     Bounds bounds(const DrawPoints& op) const {
         SkRect dst;
         dst.set(op.pts, op.count);

         // Pad the bounding box a little to make sure hairline points' bounds aren't empty.
         SkScalar stroke = SkMaxScalar(op.paint.getStrokeWidth(), 0.01f);
         dst.outset(stroke / 2, stroke / 2);

         return this->adjustAndMap(dst, &op.paint);
     }
     Bounds bounds(const DrawPatch& op) const {
         SkRect dst;
         dst.set(op.cubics, SkPatchUtils::kNumCtrlPts);
         return this->adjustAndMap(dst, &op.paint);
     }
     Bounds bounds(const DrawVertices& op) const {
         SkRect dst;
         dst.set(op.vertices, op.vertexCount);
         return this->adjustAndMap(dst, &op.paint);
     }

     Bounds bounds(const DrawPicture& op) const {
         SkRect dst = op.picture->cullRect();
         if (op.matrix) {
             op.matrix->mapRect(&dst);
         }
         return this->adjustAndMap(dst, op.paint);
     }

     Bounds bounds(const DrawPosText& op) const {
         const int N = op.paint.countText(op.text, op.byteLength);
         if (N == 0) {
             return Bounds::MakeEmpty();
         }

         SkRect dst;
         dst.set(op.pos, N);
         AdjustTextForFontMetrics(&dst, op.paint);
         return this->adjustAndMap(dst, &op.paint);
     }
     Bounds bounds(const DrawPosTextH& op) const {
         const int N = op.paint.countText(op.text, op.byteLength);
         if (N == 0) {
             return Bounds::MakeEmpty();
         }

         SkScalar left = op.xpos[0], right = op.xpos[0];
         for (int i = 1; i < N; i++) {
             left = SkMinScalar(left, op.xpos[i]);
             right = SkMaxScalar(right, op.xpos[i]);
         }
         SkRect dst = { left, op.y, right, op.y };
         AdjustTextForFontMetrics(&dst, op.paint);
         return this->adjustAndMap(dst, &op.paint);
     }
     Bounds bounds(const DrawTextOnPath& op) const {
         SkRect dst = op.path.getBounds();

         // Pad all sides by the maximum padding in any direction we'd normally apply.
         SkRect pad = { 0, 0, 0, 0 };
         AdjustTextForFontMetrics(&pad, op.paint);

         // That maximum padding happens to always be the right pad today.
         SkASSERT(pad.fLeft == -pad.fRight);
         SkASSERT(pad.fTop == -pad.fBottom);
         SkASSERT(pad.fRight > pad.fBottom);
         dst.outset(pad.fRight, pad.fRight);

         return this->adjustAndMap(dst, &op.paint);
     }

     Bounds bounds(const DrawTextBlob& op) const {
         SkRect dst = op.blob->bounds();
         dst.offset(op.x, op.y);
         return this->adjustAndMap(dst, &op.paint);
     }

     static void AdjustTextForFontMetrics(SkRect* rect, const SkPaint& paint) {
 #ifdef SK_DEBUG
         SkRect correct = *rect;
 #endif
         // crbug.com/373785 ~~> xPad = 4x yPad
         // crbug.com/424824 ~~> bump yPad from 2x text size to 2.5x
         const SkScalar yPad = 2.5f * paint.getTextSize(),
             xPad = 4.0f * yPad;
         rect->outset(xPad, yPad);
 #ifdef SK_DEBUG
         SkPaint::FontMetrics metrics;
         paint.getFontMetrics(&metrics);
         correct.fLeft += metrics.fXMin;
         correct.fTop += metrics.fTop;
         correct.fRight += metrics.fXMax;
         correct.fBottom += metrics.fBottom;
         // See skia:2862 for why we ignore small text sizes.
         SkASSERTF(paint.getTextSize() < 0.001f || rect->contains(correct),
                     "%f %f %f %f vs. %f %f %f %f\n",
                     -xPad, -yPad, +xPad, +yPad,
                     metrics.fXMin, metrics.fTop, metrics.fXMax, metrics.fBottom);
 #endif
     }

     //--------- LAYER HOISTING
     template <typename T> void trackSaveLayers(const T& op) {
         /* most ops aren't involved in saveLayers */
     }
     void trackSaveLayers(const Save& s) { this->pushSaveLayerInfo(false, NULL); }
     void trackSaveLayers(const SaveLayer& sl) {
         this->pushSaveLayerInfo(true, sl.paint);
     }
     void trackSaveLayers(const Restore& r) { this->popSaveLayerInfo(); }
     void trackSaveLayers(const DrawPicture& dp) {
         // For sub-pictures, we wrap their layer information within the parent
         // picture's rendering hierarchy
         const GrAccelData* childData = GPUOptimize(dp.picture);

         for (int i = 0; i < childData->numSaveLayers(); ++i) {
             const GrAccelData::SaveLayerInfo& src = childData->saveLayerInfo(i);

             Bounds newClip(fCurrentClipBounds);

             if (!newClip.intersect(this->adjustAndMap(src.fBounds, dp.paint))) {
                 continue;
             }

             this->updateStackForSaveLayer();

             GrAccelData::SaveLayerInfo& dst = fAccelData->addSaveLayerInfo();

             // If src.fPicture is NULL the layer is in dp.picture; otherwise
             // it belongs to a sub-picture.
             dst.fPicture = src.fPicture ? src.fPicture : static_cast<const SkPicture*>(dp.picture);
             dst.fPicture->ref();
             dst.fBounds = newClip;
             dst.fLocalMat = src.fLocalMat;
             dst.fPreMat = src.fPreMat;
             dst.fPreMat.postConcat(*fCTM);
             if (src.fPaint) {
                 dst.fPaint = SkNEW_ARGS(SkPaint, (*src.fPaint));
             }
             dst.fSaveLayerOpID = src.fSaveLayerOpID;
             dst.fRestoreOpID = src.fRestoreOpID;
             dst.fHasNestedLayers = src.fHasNestedLayers;
             dst.fIsNested = fSaveLayersInStack > 0 || src.fIsNested;
         }
     }

     // Inform all the saveLayers already on the stack that they now have a
     // nested saveLayer inside them
     void updateStackForSaveLayer() {
         for (int index = fSaveLayerStack.count() - 1; index >= 0; --index) {
             if (fSaveLayerStack[index].fHasNestedSaveLayer) {
                 break;
             }
             fSaveLayerStack[index].fHasNestedSaveLayer = true;
             if (fSaveLayerStack[index].fIsSaveLayer) {
                 break;
             }
         }
     }

     void pushSaveLayerInfo(bool isSaveLayer, const SkPaint* paint) {
         if (isSaveLayer) {
             this->updateStackForSaveLayer();
             ++fSaveLayersInStack;
         }

         fSaveLayerStack.push(SaveLayerInfo(fCurrentOp, isSaveLayer, paint, fCurrentClipBounds));
     }

     void popSaveLayerInfo() {
         if (fSaveLayerStack.count() <= 0) {
             SkASSERT(false);
             return;
         }

         SaveLayerInfo sli;
         fSaveLayerStack.pop(&sli);

         if (!sli.fIsSaveLayer) {
             return;
         }

         --fSaveLayersInStack;

         GrAccelData::SaveLayerInfo& slInfo = fAccelData->addSaveLayerInfo();

         SkASSERT(NULL == slInfo.fPicture);  // This layer is in the top-most picture

         slInfo.fBounds = fBounds[sli.fStartIndex];
         slInfo.fBounds.intersect(sli.fClipBound);
         slInfo.fLocalMat = *fCTM;
         slInfo.fPreMat = SkMatrix::I();
         if (sli.fPaint) {
             slInfo.fPaint = SkNEW_ARGS(SkPaint, (*sli.fPaint));
         }
         slInfo.fSaveLayerOpID = sli.fStartIndex;
         slInfo.fRestoreOpID = fCurrentOp;
         slInfo.fHasNestedLayers = sli.fHasNestedSaveLayer;
         slInfo.fIsNested = fSaveLayersInStack > 0;
     }
     //--------- LAYER HOISTING

     // Returns true if rect was meaningfully adjusted for the effects of paint,
     // false if the paint could affect the rect in unknown ways.
     static bool AdjustForPaint(const SkPaint* paint, SkRect* rect) {
         if (paint) {
             if (paint->canComputeFastBounds()) {
                 *rect = paint->computeFastBounds(*rect, rect);
                 return true;
             }
             return false;
         }
         return true;
     }

     bool adjustForSaveLayerPaints(SkRect* rect, int savesToIgnore = 0) const {
         for (int i = fSaveStack.count() - 1 - savesToIgnore; i >= 0; i--) {
             if (!AdjustForPaint(fSaveStack[i].paint, rect)) {
                 return false;
             }
         }
         return true;
     }

     // Adjust rect for all paints that may affect its geometry, then map it to identity space.
     Bounds adjustAndMap(SkRect rect, const SkPaint* paint) const {
         // Inverted rectangles really confuse our BBHs.
         rect.sort();

         // Adjust the rect for its own paint.
         if (!AdjustForPaint(paint, &rect)) {
             // The paint could do anything to our bounds.  The only safe answer is the current clip.
             return fCurrentClipBounds;
         }

         // Adjust rect for all the paints from the SaveLayers we're inside.
         if (!this->adjustForSaveLayerPaints(&rect)) {
             // Same deal as above.
             return fCurrentClipBounds;
         }

         // Map the rect back to identity space.
         fCTM->mapRect(&rect);

         // Nothing can draw outside the current clip.
         // (Only bounded ops call into this method, so oddballs like Clear don't matter here.)
         rect.intersect(fCurrentClipBounds);
         return rect;
     }

     // Conservative identity-space bounds for each op in the SkRecord.
     SkAutoTMalloc<Bounds> fBounds;

     // We walk fCurrentOp through the SkRecord, as we go using updateCTM()
     // and updateClipBounds() to maintain the exact CTM (fCTM) and conservative
     // identity-space bounds of the current clip (fCurrentClipBounds).
     unsigned fCurrentOp;
     const SkMatrix* fCTM;
     Bounds fCurrentClipBounds;

     // Used to track the bounds of Save/Restore blocks and the control ops inside them.
     SkTDArray<SaveBounds> fSaveStack;
     SkTDArray<unsigned>   fControlIndices;

     //--------- LAYER HOISTING
     // Used to collect saveLayer information for layer hoisting
     uint32_t              fPictureID;
     int                   fSaveLayersInStack;
     SkTDArray<SaveLayerInfo> fSaveLayerStack;
     GrAccelData*          fAccelData;
     //--------- LAYER HOISTING
 };

 } // namespace SkRecords

 // GPUOptimize is only intended to be called within the context of SkGpuDevice's
 // EXPERIMENTAL_optimize method.
 const GrAccelData* GPUOptimize(const SkPicture* pict) {
     if (NULL == pict || pict->cullRect().isEmpty()) {
         return NULL;
     }

     SkPicture::AccelData::Key key = GrAccelData::ComputeAccelDataKey();

     const GrAccelData* existing =
                             static_cast<const GrAccelData*>(pict->EXPERIMENTAL_getAccelData(key));
     if (existing) {
         return existing;
     }

     SkAutoTUnref<GrAccelData> data(SkNEW_ARGS(GrAccelData, (key)));

     pict->EXPERIMENTAL_addAccelData(data);

     SkRecords::CollectLayers collector(pict, data);

     return data;
 }
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrPictureUtils.h"

	#include "SkPaintPriv.h"
	#include "SkPatchUtils.h"
	#include "SkRecord.h"
	#include "SkRecords.h"

	SkPicture::AccelData::Key GrAccelData::ComputeAccelDataKey() {
	static const SkPicture::AccelData::Key gGPUID = SkPicture::AccelData::GenerateDomain();

	return gGPUID;
	}

	// This looks silly, I know. Why not just use SkRect::MakeLargest()?
	// In practice, this is well large enough, and it has a few extra advantages:
	// it fits in an SkIRect, and we can munge it a little in both SkRect and
	// SKIRect space without worrying about overflow.
	static const SkRect kUnbounded = { -2e9f, -2e9f, 2e9f, 2e9f };

	namespace SkRecords {

	// SkRecord visitor to gather saveLayer/restore information.
	class CollectLayers : SkNoncopyable {
	public:
	CollectLayers(const SkPicture* pict, GrAccelData* accelData)
	: fPictureID(pict->uniqueID())
	, fSaveLayersInStack(0)
	, fAccelData(accelData) {

	// Calculate bounds for all ops. This won't go quite in order, so we'll need
	// to store the bounds separately then feed them in to the BBH later in order.
	fCTM = &SkMatrix::I();
	fCurrentClipBounds = kUnbounded;

	if (NULL == pict->fRecord.get()) {
	return;
	}

	fBounds.reset(pict->fRecord->count());

	for (fCurrentOp = 0; fCurrentOp < pict->fRecord->count(); ++fCurrentOp) {
	pict->fRecord->visit<void>(fCurrentOp, *this);
	}

	// If we have any lingering unpaired Saves, simulate restores to make
	// sure all ops in those Save blocks have their bounds calculated.
	while (!fSaveStack.isEmpty()) {
	this->popSaveBlock();
	}

	// Any control ops not part of any Save/Restore block draw everywhere.
	while (!fControlIndices.isEmpty()) {
	this->popControl(kUnbounded);
	}

	//--------- LAYER HOISTING
	while (!fSaveLayerStack.isEmpty()) {
	this->popSaveLayerInfo();
	}
	//--------- LAYER HOISTING
	}

	template <typename T> void operator()(const T& op) {
	this->updateCTM(op);
	this->updateClipBounds(op);
	this->trackBounds(op);
	//--------- LAYER HOISTING
	this->trackSaveLayers(op);
	//--------- LAYER HOISTING
	}

	private:
	// In this file, SkRect are in local coordinates, Bounds are translated back to identity space.
	typedef SkRect Bounds;

	struct SaveBounds {
	int controlOps; // Number of control ops in this Save block, including the Save.
	Bounds bounds; // Bounds of everything in the block.
	const SkPaint* paint; // Unowned. If set, adjusts the bounds of all ops in this block.
	};

	//--------- LAYER HOISTING
	class SaveLayerInfo {
	public:
	SaveLayerInfo() { }
	SaveLayerInfo(int opIndex, bool isSaveLayer, const SkPaint* paint, const Bounds& clipBound)
	: fStartIndex(opIndex)
	, fIsSaveLayer(isSaveLayer)
	, fHasNestedSaveLayer(false)
	, fPaint(paint)
	, fClipBound(clipBound) {
	}

	int fStartIndex;
	bool fIsSaveLayer;
	bool fHasNestedSaveLayer;
	const SkPaint* fPaint;
	Bounds fClipBound;
	};
	//--------- LAYER HOISTING

	// Only Restore and SetMatrix change the CTM.
	template <typename T> void updateCTM(const T&) {}
	void updateCTM(const Restore& op) { fCTM = &op.matrix; }
	void updateCTM(const SetMatrix& op) { fCTM = &op.matrix; }

	// Most ops don't change the clip.
	template <typename T> void updateClipBounds(const T&) {}

	// Clip{Path,RRect,Rect,Region} obviously change the clip. They all know their bounds already.
	void updateClipBounds(const ClipPath& op) { this->updateClipBoundsForClipOp(op.devBounds); }
	void updateClipBounds(const ClipRRect& op) { this->updateClipBoundsForClipOp(op.devBounds); }
	void updateClipBounds(const ClipRect& op) { this->updateClipBoundsForClipOp(op.devBounds); }
	void updateClipBounds(const ClipRegion& op) { this->updateClipBoundsForClipOp(op.devBounds); }

	// The bounds of clip ops need to be adjusted for the paints of saveLayers they're inside.
	void updateClipBoundsForClipOp(const SkIRect& devBounds) {
	Bounds clip = SkRect::Make(devBounds);
	// We don't call adjustAndMap() because as its last step it would intersect the adjusted
	// clip bounds with the previous clip, exactly what we can't do when the clip grows.
	fCurrentClipBounds = this->adjustForSaveLayerPaints(&clip) ? clip : kUnbounded;
	}

	// Restore holds the devBounds for the clip after the {save,saveLayer}/restore block completes.
	void updateClipBounds(const Restore& op) {
	// This is just like the clip ops above, but we need to skip the effects (if any) of our
	// paired saveLayer (if it is one); it has not yet been popped off the save stack. Our
	// devBounds reflect the state of the world after the saveLayer/restore block is done,
	// so they are not affected by the saveLayer's paint.
	const int kSavesToIgnore = 1;
	Bounds clip = SkRect::Make(op.devBounds);
	fCurrentClipBounds =
	this->adjustForSaveLayerPaints(&clip, kSavesToIgnore) ? clip : kUnbounded;
	}

	// We also take advantage of SaveLayer bounds when present to further cut the clip down.
	void updateClipBounds(const SaveLayer& op) {
	if (op.bounds) {
	// adjustAndMap() intersects these layer bounds with the previous clip for us.
	fCurrentClipBounds = this->adjustAndMap(*op.bounds, op.paint);
	}
	}

	// The bounds of these ops must be calculated when we hit the Restore
	// from the bounds of the ops in the same Save block.
	void trackBounds(const Save&) { this->pushSaveBlock(NULL); }
	void trackBounds(const SaveLayer& op) { this->pushSaveBlock(op.paint); }
	void trackBounds(const Restore&) { fBounds[fCurrentOp] = this->popSaveBlock(); }

	void trackBounds(const SetMatrix&) { this->pushControl(); }
	void trackBounds(const ClipRect&) { this->pushControl(); }
	void trackBounds(const ClipRRect&) { this->pushControl(); }
	void trackBounds(const ClipPath&) { this->pushControl(); }
	void trackBounds(const ClipRegion&) { this->pushControl(); }
	void trackBounds(const PushCull&) { this->pushControl(); }
	void trackBounds(const PopCull&) { this->pushControl(); }
	void trackBounds(const BeginCommentGroup&) { this->pushControl(); }
	void trackBounds(const AddComment&) { this->pushControl(); }
	void trackBounds(const EndCommentGroup&) { this->pushControl(); }
	void trackBounds(const DrawData&) { this->pushControl(); }

	// For all other ops, we can calculate and store the bounds directly now.
	template <typename T> void trackBounds(const T& op) {
	fBounds[fCurrentOp] = this->bounds(op);
	this->updateSaveBounds(fBounds[fCurrentOp]);
	}

	void pushSaveBlock(const SkPaint* paint) {
	// Starting a new Save block. Push a new entry to represent that.
	SaveBounds sb = { 0, Bounds::MakeEmpty(), paint };
	fSaveStack.push(sb);
	this->pushControl();
	}

	static bool PaintMayAffectTransparentBlack(const SkPaint* paint) {
	if (paint) {
	// FIXME: this is very conservative
	if (paint->getImageFilter() \|\| paint->getColorFilter()) {
	return true;
	}

	// Unusual Xfermodes require us to process a saved layer
	// even with operations outisde the clip.
	// For example, DstIn is used by masking layers.
	// https://code.google.com/p/skia/issues/detail?id=1291
	// https://crbug.com/401593
	SkXfermode* xfermode = paint->getXfermode();
	SkXfermode::Mode mode;
	// SrcOver is ok, and is also the common case with a NULL xfermode.
	// So we should make that the fast path and bypass the mode extraction
	// and test.
	if (xfermode && xfermode->asMode(&mode)) {
	switch (mode) {
	// For each of the following transfer modes, if the source
	// alpha is zero (our transparent black), the resulting
	// blended alpha is not necessarily equal to the original
	// destination alpha.
	case SkXfermode::kClear_Mode:
	case SkXfermode::kSrc_Mode:
	case SkXfermode::kSrcIn_Mode:
	case SkXfermode::kDstIn_Mode:
	case SkXfermode::kSrcOut_Mode:
	case SkXfermode::kDstATop_Mode:
	case SkXfermode::kModulate_Mode:
	return true;
	break;
	default:
	break;
	}
	}
	}
	return false;
	}

	Bounds popSaveBlock() {
	// We're done the Save block. Apply the block's bounds to all control ops inside it.
	SaveBounds sb;
	fSaveStack.pop(&sb);

	// If the paint affects transparent black, we can't trust any of our calculated bounds.
	const Bounds& bounds =
	PaintMayAffectTransparentBlack(sb.paint) ? fCurrentClipBounds : sb.bounds;

	while (sb.controlOps-- > 0) {
	this->popControl(bounds);
	}

	// This whole Save block may be part another Save block.
	this->updateSaveBounds(bounds);

	// If called from a real Restore (not a phony one for balance), it'll need the bounds.
	return bounds;
	}

	void pushControl() {
	fControlIndices.push(fCurrentOp);
	if (!fSaveStack.isEmpty()) {
	fSaveStack.top().controlOps++;
	}
	}

	void popControl(const Bounds& bounds) {
	fBounds[fControlIndices.top()] = bounds;
	fControlIndices.pop();
	}

	void updateSaveBounds(const Bounds& bounds) {
	// If we're in a Save block, expand its bounds to cover these bounds too.
	if (!fSaveStack.isEmpty()) {
	fSaveStack.top().bounds.join(bounds);
	}
	}

	// FIXME: this method could use better bounds
	Bounds bounds(const DrawText&) const { return fCurrentClipBounds; }

	Bounds bounds(const Clear&) const { return kUnbounded; } // Ignores the clip.
	Bounds bounds(const DrawPaint&) const { return fCurrentClipBounds; }
	Bounds bounds(const NoOp&) const { return Bounds::MakeEmpty(); } // NoOps don't draw.

	Bounds bounds(const DrawSprite& op) const {
	const SkBitmap& bm = op.bitmap;

	return Bounds::Make(SkIRect::MakeXYWH(op.left, op.top, bm.width(), bm.height())); // Ignores the matrix.
	}

	Bounds bounds(const DrawRect& op) const { return this->adjustAndMap(op.rect, &op.paint); }
	Bounds bounds(const DrawOval& op) const { return this->adjustAndMap(op.oval, &op.paint); }
	Bounds bounds(const DrawRRect& op) const {
	return this->adjustAndMap(op.rrect.rect(), &op.paint);
	}
	Bounds bounds(const DrawDRRect& op) const {
	return this->adjustAndMap(op.outer.rect(), &op.paint);
	}
	Bounds bounds(const DrawImage& op) const {
	const SkImage* image = op.image;
	SkRect rect = SkRect::MakeXYWH(op.left, op.top,
	SkIntToScalar(image->width()), SkIntToScalar(image->height()));

	return this->adjustAndMap(rect, op.paint);
	}
	Bounds bounds(const DrawImageRect& op) const {
	return this->adjustAndMap(op.dst, op.paint);
	}
	Bounds bounds(const DrawBitmapRectToRect& op) const {
	return this->adjustAndMap(op.dst, op.paint);
	}
	Bounds bounds(const DrawBitmapNine& op) const {
	return this->adjustAndMap(op.dst, op.paint);
	}
	Bounds bounds(const DrawBitmap& op) const {
	const SkBitmap& bm = op.bitmap;
	return this->adjustAndMap(SkRect::MakeXYWH(op.left, op.top, SkIntToScalar(bm.width()), SkIntToScalar(bm.height())),
	op.paint);
	}
	Bounds bounds(const DrawBitmapMatrix& op) const {
	const SkBitmap& bm = op.bitmap;
	SkRect dst = SkRect::Make(SkIRect::MakeWH(bm.width(), bm.height()));
	op.matrix.mapRect(&dst);
	return this->adjustAndMap(dst, op.paint);
	}

	Bounds bounds(const DrawPath& op) const {
	return op.path.isInverseFillType() ? fCurrentClipBounds
	: this->adjustAndMap(op.path.getBounds(), &op.paint);
	}
	Bounds bounds(const DrawPoints& op) const {
	SkRect dst;
	dst.set(op.pts, op.count);

	// Pad the bounding box a little to make sure hairline points' bounds aren't empty.
	SkScalar stroke = SkMaxScalar(op.paint.getStrokeWidth(), 0.01f);
	dst.outset(stroke / 2, stroke / 2);

	return this->adjustAndMap(dst, &op.paint);
	}
	Bounds bounds(const DrawPatch& op) const {
	SkRect dst;
	dst.set(op.cubics, SkPatchUtils::kNumCtrlPts);
	return this->adjustAndMap(dst, &op.paint);
	}
	Bounds bounds(const DrawVertices& op) const {
	SkRect dst;
	dst.set(op.vertices, op.vertexCount);
	return this->adjustAndMap(dst, &op.paint);
	}

	Bounds bounds(const DrawPicture& op) const {
	SkRect dst = op.picture->cullRect();
	if (op.matrix) {
	op.matrix->mapRect(&dst);
	}
	return this->adjustAndMap(dst, op.paint);
	}

	Bounds bounds(const DrawPosText& op) const {
	const int N = op.paint.countText(op.text, op.byteLength);
	if (N == 0) {
	return Bounds::MakeEmpty();
	}

	SkRect dst;
	dst.set(op.pos, N);
	AdjustTextForFontMetrics(&dst, op.paint);
	return this->adjustAndMap(dst, &op.paint);
	}
	Bounds bounds(const DrawPosTextH& op) const {
	const int N = op.paint.countText(op.text, op.byteLength);
	if (N == 0) {
	return Bounds::MakeEmpty();
	}

	SkScalar left = op.xpos[0], right = op.xpos[0];
	for (int i = 1; i < N; i++) {
	left = SkMinScalar(left, op.xpos[i]);
	right = SkMaxScalar(right, op.xpos[i]);
	}
	SkRect dst = { left, op.y, right, op.y };
	AdjustTextForFontMetrics(&dst, op.paint);
	return this->adjustAndMap(dst, &op.paint);
	}
	Bounds bounds(const DrawTextOnPath& op) const {
	SkRect dst = op.path.getBounds();

	// Pad all sides by the maximum padding in any direction we'd normally apply.
	SkRect pad = { 0, 0, 0, 0 };
	AdjustTextForFontMetrics(&pad, op.paint);

	// That maximum padding happens to always be the right pad today.
	SkASSERT(pad.fLeft == -pad.fRight);
	SkASSERT(pad.fTop == -pad.fBottom);
	SkASSERT(pad.fRight > pad.fBottom);
	dst.outset(pad.fRight, pad.fRight);

	return this->adjustAndMap(dst, &op.paint);
	}

	Bounds bounds(const DrawTextBlob& op) const {
	SkRect dst = op.blob->bounds();
	dst.offset(op.x, op.y);
	return this->adjustAndMap(dst, &op.paint);
	}

	static void AdjustTextForFontMetrics(SkRect* rect, const SkPaint& paint) {
	#ifdef SK_DEBUG
	SkRect correct = *rect;
	#endif
	// crbug.com/373785 ~~> xPad = 4x yPad
	// crbug.com/424824 ~~> bump yPad from 2x text size to 2.5x
	const SkScalar yPad = 2.5f * paint.getTextSize(),
	xPad = 4.0f * yPad;
	rect->outset(xPad, yPad);
	#ifdef SK_DEBUG
	SkPaint::FontMetrics metrics;
	paint.getFontMetrics(&metrics);
	correct.fLeft += metrics.fXMin;
	correct.fTop += metrics.fTop;
	correct.fRight += metrics.fXMax;
	correct.fBottom += metrics.fBottom;
	// See skia:2862 for why we ignore small text sizes.
	SkASSERTF(paint.getTextSize() < 0.001f \|\| rect->contains(correct),
	"%f %f %f %f vs. %f %f %f %f\n",
	-xPad, -yPad, +xPad, +yPad,
	metrics.fXMin, metrics.fTop, metrics.fXMax, metrics.fBottom);
	#endif
	}

	//--------- LAYER HOISTING
	template <typename T> void trackSaveLayers(const T& op) {
	/* most ops aren't involved in saveLayers */
	}
	void trackSaveLayers(const Save& s) { this->pushSaveLayerInfo(false, NULL); }
	void trackSaveLayers(const SaveLayer& sl) {
	this->pushSaveLayerInfo(true, sl.paint);
	}
	void trackSaveLayers(const Restore& r) { this->popSaveLayerInfo(); }
	void trackSaveLayers(const DrawPicture& dp) {
	// For sub-pictures, we wrap their layer information within the parent
	// picture's rendering hierarchy
	const GrAccelData* childData = GPUOptimize(dp.picture);

	for (int i = 0; i < childData->numSaveLayers(); ++i) {
	const GrAccelData::SaveLayerInfo& src = childData->saveLayerInfo(i);

	Bounds newClip(fCurrentClipBounds);

	if (!newClip.intersect(this->adjustAndMap(src.fBounds, dp.paint))) {
	continue;
	}

	this->updateStackForSaveLayer();

	GrAccelData::SaveLayerInfo& dst = fAccelData->addSaveLayerInfo();

	// If src.fPicture is NULL the layer is in dp.picture; otherwise
	// it belongs to a sub-picture.
	dst.fPicture = src.fPicture ? src.fPicture : static_cast<const SkPicture*>(dp.picture);
	dst.fPicture->ref();
	dst.fBounds = newClip;
	dst.fLocalMat = src.fLocalMat;
	dst.fPreMat = src.fPreMat;
	dst.fPreMat.postConcat(*fCTM);
	if (src.fPaint) {
	dst.fPaint = SkNEW_ARGS(SkPaint, (*src.fPaint));
	}
	dst.fSaveLayerOpID = src.fSaveLayerOpID;
	dst.fRestoreOpID = src.fRestoreOpID;
	dst.fHasNestedLayers = src.fHasNestedLayers;
	dst.fIsNested = fSaveLayersInStack > 0 \|\| src.fIsNested;
	}
	}

	// Inform all the saveLayers already on the stack that they now have a
	// nested saveLayer inside them
	void updateStackForSaveLayer() {
	for (int index = fSaveLayerStack.count() - 1; index >= 0; --index) {
	if (fSaveLayerStack[index].fHasNestedSaveLayer) {
	break;
	}
	fSaveLayerStack[index].fHasNestedSaveLayer = true;
	if (fSaveLayerStack[index].fIsSaveLayer) {
	break;
	}
	}
	}

	void pushSaveLayerInfo(bool isSaveLayer, const SkPaint* paint) {
	if (isSaveLayer) {
	this->updateStackForSaveLayer();
	++fSaveLayersInStack;
	}

	fSaveLayerStack.push(SaveLayerInfo(fCurrentOp, isSaveLayer, paint, fCurrentClipBounds));
	}

	void popSaveLayerInfo() {
	if (fSaveLayerStack.count() <= 0) {
	SkASSERT(false);
	return;
	}

	SaveLayerInfo sli;
	fSaveLayerStack.pop(&sli);

	if (!sli.fIsSaveLayer) {
	return;
	}

	--fSaveLayersInStack;

	GrAccelData::SaveLayerInfo& slInfo = fAccelData->addSaveLayerInfo();

	SkASSERT(NULL == slInfo.fPicture); // This layer is in the top-most picture

	slInfo.fBounds = fBounds[sli.fStartIndex];
	slInfo.fBounds.intersect(sli.fClipBound);
	slInfo.fLocalMat = *fCTM;
	slInfo.fPreMat = SkMatrix::I();
	if (sli.fPaint) {
	slInfo.fPaint = SkNEW_ARGS(SkPaint, (*sli.fPaint));
	}
	slInfo.fSaveLayerOpID = sli.fStartIndex;
	slInfo.fRestoreOpID = fCurrentOp;
	slInfo.fHasNestedLayers = sli.fHasNestedSaveLayer;
	slInfo.fIsNested = fSaveLayersInStack > 0;
	}
	//--------- LAYER HOISTING

	// Returns true if rect was meaningfully adjusted for the effects of paint,
	// false if the paint could affect the rect in unknown ways.
	static bool AdjustForPaint(const SkPaint* paint, SkRect* rect) {
	if (paint) {
	if (paint->canComputeFastBounds()) {
	rect = paint->computeFastBounds(rect, rect);
	return true;
	}
	return false;
	}
	return true;
	}

	bool adjustForSaveLayerPaints(SkRect* rect, int savesToIgnore = 0) const {
	for (int i = fSaveStack.count() - 1 - savesToIgnore; i >= 0; i--) {
	if (!AdjustForPaint(fSaveStack[i].paint, rect)) {
	return false;
	}
	}
	return true;
	}

	// Adjust rect for all paints that may affect its geometry, then map it to identity space.
	Bounds adjustAndMap(SkRect rect, const SkPaint* paint) const {
	// Inverted rectangles really confuse our BBHs.
	rect.sort();

	// Adjust the rect for its own paint.
	if (!AdjustForPaint(paint, &rect)) {
	// The paint could do anything to our bounds. The only safe answer is the current clip.
	return fCurrentClipBounds;
	}

	// Adjust rect for all the paints from the SaveLayers we're inside.
	if (!this->adjustForSaveLayerPaints(&rect)) {
	// Same deal as above.
	return fCurrentClipBounds;
	}

	// Map the rect back to identity space.
	fCTM->mapRect(&rect);

	// Nothing can draw outside the current clip.
	// (Only bounded ops call into this method, so oddballs like Clear don't matter here.)
	rect.intersect(fCurrentClipBounds);
	return rect;
	}

	// Conservative identity-space bounds for each op in the SkRecord.
	SkAutoTMalloc<Bounds> fBounds;

	// We walk fCurrentOp through the SkRecord, as we go using updateCTM()
	// and updateClipBounds() to maintain the exact CTM (fCTM) and conservative
	// identity-space bounds of the current clip (fCurrentClipBounds).
	unsigned fCurrentOp;
	const SkMatrix* fCTM;
	Bounds fCurrentClipBounds;

	// Used to track the bounds of Save/Restore blocks and the control ops inside them.
	SkTDArray<SaveBounds> fSaveStack;
	SkTDArray<unsigned> fControlIndices;

	//--------- LAYER HOISTING
	// Used to collect saveLayer information for layer hoisting
	uint32_t fPictureID;
	int fSaveLayersInStack;
	SkTDArray<SaveLayerInfo> fSaveLayerStack;
	GrAccelData* fAccelData;
	//--------- LAYER HOISTING
	};

	} // namespace SkRecords

	// GPUOptimize is only intended to be called within the context of SkGpuDevice's
	// EXPERIMENTAL_optimize method.
	const GrAccelData* GPUOptimize(const SkPicture* pict) {
	if (NULL == pict \|\| pict->cullRect().isEmpty()) {
	return NULL;
	}

	SkPicture::AccelData::Key key = GrAccelData::ComputeAccelDataKey();

	const GrAccelData* existing =
	static_cast<const GrAccelData*>(pict->EXPERIMENTAL_getAccelData(key));
	if (existing) {
	return existing;
	}

	SkAutoTUnref<GrAccelData> data(SkNEW_ARGS(GrAccelData, (key)));

	pict->EXPERIMENTAL_addAccelData(data);

	SkRecords::CollectLayers collector(pict, data);

	return data;
	}