src/utils/debugger/SkDebugCanvas.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkClipStack.h"
 #include "SkDebugCanvas.h"
 #include "SkDrawCommand.h"
 #include "SkDevice.h"
 #include "SkPaintFilterCanvas.h"
 #include "SkOverdrawMode.h"

 class DebugPaintFilterCanvas : public SkPaintFilterCanvas {
 public:
     DebugPaintFilterCanvas(int width,
                            int height,
                            bool overdrawViz,
                            bool overrideFilterQuality,
                            SkFilterQuality quality)
         : INHERITED(width, height)
         , fOverdrawXfermode(overdrawViz ? SkOverdrawMode::Create() : nullptr)
         , fOverrideFilterQuality(overrideFilterQuality)
         , fFilterQuality(quality) {}

 protected:
     bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type) const override {
         if (*paint) {
             if (nullptr != fOverdrawXfermode.get()) {
                 paint->writable()->setAntiAlias(false);
                 paint->writable()->setXfermode(fOverdrawXfermode.get());
             }

             if (fOverrideFilterQuality) {
                 paint->writable()->setFilterQuality(fFilterQuality);
             }
         }
         return true;
     }

     void onDrawPicture(const SkPicture* picture,
                        const SkMatrix* matrix,
                        const SkPaint* paint) override {
         // We need to replay the picture onto this canvas in order to filter its internal paints.
         this->SkCanvas::onDrawPicture(picture, matrix, paint);
     }

 private:
     SkAutoTUnref<SkXfermode> fOverdrawXfermode;

     bool fOverrideFilterQuality;
     SkFilterQuality fFilterQuality;

     typedef SkPaintFilterCanvas INHERITED;
 };

 SkDebugCanvas::SkDebugCanvas(int width, int height)
         : INHERITED(width, height)
         , fPicture(nullptr)
         , fFilter(false)
         , fMegaVizMode(false)
         , fOverdrawViz(false)
         , fOverrideFilterQuality(false)
         , fFilterQuality(kNone_SkFilterQuality) {
     fUserMatrix.reset();

     // SkPicturePlayback uses the base-class' quickReject calls to cull clipped
     // operations. This can lead to problems in the debugger which expects all
     // the operations in the captured skp to appear in the debug canvas. To
     // circumvent this we create a wide open clip here (an empty clip rect
     // is not sufficient).
     // Internally, the SkRect passed to clipRect is converted to an SkIRect and
     // rounded out. The following code creates a nearly maximal rect that will
     // not get collapsed by the coming conversions (Due to precision loss the
     // inset has to be surprisingly large).
     SkIRect largeIRect = SkIRect::MakeLargest();
     largeIRect.inset(1024, 1024);
     SkRect large = SkRect::Make(largeIRect);
 #ifdef SK_DEBUG
     SkASSERT(!large.roundOut().isEmpty());
 #endif
     // call the base class' version to avoid adding a draw command
     this->INHERITED::onClipRect(large, SkRegion::kReplace_Op, kHard_ClipEdgeStyle);
 }

 SkDebugCanvas::~SkDebugCanvas() {
     fCommandVector.deleteAll();
 }

 void SkDebugCanvas::addDrawCommand(SkDrawCommand* command) {
     fCommandVector.push(command);
 }

 void SkDebugCanvas::draw(SkCanvas* canvas) {
     if (!fCommandVector.isEmpty()) {
         this->drawTo(canvas, fCommandVector.count() - 1);
     }
 }

 void SkDebugCanvas::applyUserTransform(SkCanvas* canvas) {
     canvas->concat(fUserMatrix);
 }

 int SkDebugCanvas::getCommandAtPoint(int x, int y, int index) {
     SkBitmap bitmap;
     bitmap.allocPixels(SkImageInfo::MakeN32Premul(1, 1));

     SkCanvas canvas(bitmap);
     canvas.translate(SkIntToScalar(-x), SkIntToScalar(-y));
     this->applyUserTransform(&canvas);

     int layer = 0;
     SkColor prev = bitmap.getColor(0,0);
     for (int i = 0; i < index; i++) {
         if (fCommandVector[i]->isVisible()) {
             fCommandVector[i]->setUserMatrix(fUserMatrix);
             fCommandVector[i]->execute(&canvas);
         }
         if (prev != bitmap.getColor(0,0)) {
             layer = i;
         }
         prev = bitmap.getColor(0,0);
     }
     return layer;
 }

 class SkDebugClipVisitor : public SkCanvas::ClipVisitor {
 public:
     SkDebugClipVisitor(SkCanvas* canvas) : fCanvas(canvas) {}

     void clipRect(const SkRect& r, SkRegion::Op, bool doAA) override {
         SkPaint p;
         p.setColor(SK_ColorRED);
         p.setStyle(SkPaint::kStroke_Style);
         p.setAntiAlias(doAA);
         fCanvas->drawRect(r, p);
     }
     void clipRRect(const SkRRect& rr, SkRegion::Op, bool doAA) override {
         SkPaint p;
         p.setColor(SK_ColorGREEN);
         p.setStyle(SkPaint::kStroke_Style);
         p.setAntiAlias(doAA);
         fCanvas->drawRRect(rr, p);
     }
     void clipPath(const SkPath& path, SkRegion::Op, bool doAA) override {
         SkPaint p;
         p.setColor(SK_ColorBLUE);
         p.setStyle(SkPaint::kStroke_Style);
         p.setAntiAlias(doAA);
         fCanvas->drawPath(path, p);
     }

 protected:
     SkCanvas* fCanvas;

 private:
     typedef SkCanvas::ClipVisitor INHERITED;
 };

 // set up the saveLayer commands so that the active ones
 // return true in their 'active' method
 void SkDebugCanvas::markActiveCommands(int index) {
     fActiveLayers.rewind();

     for (int i = 0; i < fCommandVector.count(); ++i) {
         fCommandVector[i]->setActive(false);
     }

     for (int i = 0; i < index; ++i) {
         SkDrawCommand::Action result = fCommandVector[i]->action();
         if (SkDrawCommand::kPushLayer_Action == result) {
             fActiveLayers.push(fCommandVector[i]);
         } else if (SkDrawCommand::kPopLayer_Action == result) {
             fActiveLayers.pop();
         }
     }

     for (int i = 0; i < fActiveLayers.count(); ++i) {
         fActiveLayers[i]->setActive(true);
     }

 }

 void SkDebugCanvas::drawTo(SkCanvas* canvas, int index) {
     SkASSERT(!fCommandVector.isEmpty());
     SkASSERT(index < fCommandVector.count());

     int saveCount = canvas->save();

     SkRect windowRect = SkRect::MakeWH(SkIntToScalar(canvas->getBaseLayerSize().width()),
                                        SkIntToScalar(canvas->getBaseLayerSize().height()));

     bool pathOpsMode = getAllowSimplifyClip();
     canvas->setAllowSimplifyClip(pathOpsMode);
     canvas->clear(SK_ColorTRANSPARENT);
     canvas->resetMatrix();
     if (!windowRect.isEmpty()) {
         canvas->clipRect(windowRect, SkRegion::kReplace_Op);
     }
     this->applyUserTransform(canvas);

     if (fPaintFilterCanvas) {
         fPaintFilterCanvas->addCanvas(canvas);
         canvas = fPaintFilterCanvas.get();
     }

     if (fMegaVizMode) {
         this->markActiveCommands(index);
     }

     for (int i = 0; i <= index; i++) {
         if (i == index && fFilter) {
             canvas->clear(0xAAFFFFFF);
         }

         if (fCommandVector[i]->isVisible()) {
             if (fMegaVizMode && fCommandVector[i]->active()) {
                 // "active" commands execute their visualization behaviors:
                 //     All active saveLayers get replaced with saves so all draws go to the
                 //     visible canvas.
                 //     All active culls draw their cull box
                 fCommandVector[i]->vizExecute(canvas);
             } else {
                 fCommandVector[i]->setUserMatrix(fUserMatrix);
                 fCommandVector[i]->execute(canvas);
             }
         }
     }

     if (fMegaVizMode) {
         canvas->save();
         // nuke the CTM
         canvas->resetMatrix();
         // turn off clipping
         if (!windowRect.isEmpty()) {
             SkRect r = windowRect;
             r.outset(SK_Scalar1, SK_Scalar1);
             canvas->clipRect(r, SkRegion::kReplace_Op);
         }
         // visualize existing clips
         SkDebugClipVisitor visitor(canvas);

         canvas->replayClips(&visitor);

         canvas->restore();
     }
     if (pathOpsMode) {
         this->resetClipStackData();
         const SkClipStack* clipStack = canvas->getClipStack();
         SkClipStack::Iter iter(*clipStack, SkClipStack::Iter::kBottom_IterStart);
         const SkClipStack::Element* element;
         SkPath devPath;
         while ((element = iter.next())) {
             SkClipStack::Element::Type type = element->getType();
             SkPath operand;
             if (type != SkClipStack::Element::kEmpty_Type) {
                element->asPath(&operand);
             }
             SkRegion::Op elementOp = element->getOp();
             this->addClipStackData(devPath, operand, elementOp);
             if (elementOp == SkRegion::kReplace_Op) {
                 devPath = operand;
             } else {
                 Op(devPath, operand, (SkPathOp) elementOp, &devPath);
             }
         }
         this->lastClipStackData(devPath);
     }
     fMatrix = canvas->getTotalMatrix();
     if (!canvas->getClipDeviceBounds(&fClip)) {
         fClip.setEmpty();
     }

     canvas->restoreToCount(saveCount);

     if (fPaintFilterCanvas) {
         fPaintFilterCanvas->removeAll();
     }
 }

 void SkDebugCanvas::deleteDrawCommandAt(int index) {
     SkASSERT(index < fCommandVector.count());
     delete fCommandVector[index];
     fCommandVector.remove(index);
 }

 SkDrawCommand* SkDebugCanvas::getDrawCommandAt(int index) {
     SkASSERT(index < fCommandVector.count());
     return fCommandVector[index];
 }

 void SkDebugCanvas::setDrawCommandAt(int index, SkDrawCommand* command) {
     SkASSERT(index < fCommandVector.count());
     delete fCommandVector[index];
     fCommandVector[index] = command;
 }

 const SkTDArray<SkString*>* SkDebugCanvas::getCommandInfo(int index) const {
     SkASSERT(index < fCommandVector.count());
     return fCommandVector[index]->Info();
 }

 bool SkDebugCanvas::getDrawCommandVisibilityAt(int index) {
     SkASSERT(index < fCommandVector.count());
     return fCommandVector[index]->isVisible();
 }

 const SkTDArray <SkDrawCommand*>& SkDebugCanvas::getDrawCommands() const {
     return fCommandVector;
 }

 SkTDArray <SkDrawCommand*>& SkDebugCanvas::getDrawCommands() {
     return fCommandVector;
 }

 void SkDebugCanvas::updatePaintFilterCanvas() {
     if (!fOverdrawViz && !fOverrideFilterQuality) {
         fPaintFilterCanvas.reset(nullptr);
         return;
     }

     const SkImageInfo info = this->imageInfo();
     fPaintFilterCanvas.reset(new DebugPaintFilterCanvas(info.width(), info.height(), fOverdrawViz,
                                                         fOverrideFilterQuality, fFilterQuality));
 }

 void SkDebugCanvas::setOverdrawViz(bool overdrawViz) {
     if (fOverdrawViz == overdrawViz) {
         return;
     }

     fOverdrawViz = overdrawViz;
     this->updatePaintFilterCanvas();
 }

 void SkDebugCanvas::overrideTexFiltering(bool overrideTexFiltering, SkFilterQuality quality) {
     if (fOverrideFilterQuality == overrideTexFiltering && fFilterQuality == quality) {
         return;
     }

     fOverrideFilterQuality = overrideTexFiltering;
     fFilterQuality = quality;
     this->updatePaintFilterCanvas();
 }

 void SkDebugCanvas::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     this->addDrawCommand(new SkClipPathCommand(path, op, kSoft_ClipEdgeStyle == edgeStyle));
 }

 void SkDebugCanvas::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     this->addDrawCommand(new SkClipRectCommand(rect, op, kSoft_ClipEdgeStyle == edgeStyle));
 }

 void SkDebugCanvas::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
     this->addDrawCommand(new SkClipRRectCommand(rrect, op, kSoft_ClipEdgeStyle == edgeStyle));
 }

 void SkDebugCanvas::onClipRegion(const SkRegion& region, SkRegion::Op op) {
     this->addDrawCommand(new SkClipRegionCommand(region, op));
 }

 void SkDebugCanvas::didConcat(const SkMatrix& matrix) {
     this->addDrawCommand(new SkConcatCommand(matrix));
     this->INHERITED::didConcat(matrix);
 }

 void SkDebugCanvas::onDrawBitmap(const SkBitmap& bitmap, SkScalar left,
                                  SkScalar top, const SkPaint* paint) {
     this->addDrawCommand(new SkDrawBitmapCommand(bitmap, left, top, paint));
 }

 void SkDebugCanvas::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
                                      const SkPaint* paint, SrcRectConstraint constraint) {
     this->addDrawCommand(new SkDrawBitmapRectCommand(bitmap, src, dst, paint,
                                                      (SrcRectConstraint)constraint));
 }

 void SkDebugCanvas::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
                                      const SkRect& dst, const SkPaint* paint) {
     this->addDrawCommand(new SkDrawBitmapNineCommand(bitmap, center, dst, paint));
 }

 void SkDebugCanvas::onDrawImage(const SkImage* image, SkScalar left, SkScalar top,
                                 const SkPaint* paint) {
     this->addDrawCommand(new SkDrawImageCommand(image, left, top, paint));
 }

 void SkDebugCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
                                     const SkPaint* paint, SrcRectConstraint constraint) {
     this->addDrawCommand(new SkDrawImageRectCommand(image, src, dst, paint, constraint));
 }

 void SkDebugCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawOvalCommand(oval, paint));
 }

 void SkDebugCanvas::onDrawPaint(const SkPaint& paint) {
     this->addDrawCommand(new SkDrawPaintCommand(paint));
 }

 void SkDebugCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawPathCommand(path, paint));
 }

 void SkDebugCanvas::onDrawPicture(const SkPicture* picture,
                                   const SkMatrix* matrix,
                                   const SkPaint* paint) {
     this->addDrawCommand(new SkBeginDrawPictureCommand(picture, matrix, paint));
     this->INHERITED::onDrawPicture(picture, matrix, paint);
     this->addDrawCommand(new SkEndDrawPictureCommand(SkToBool(matrix) || SkToBool(paint)));
 }

 void SkDebugCanvas::onDrawPoints(PointMode mode, size_t count,
                                  const SkPoint pts[], const SkPaint& paint) {
     this->addDrawCommand(new SkDrawPointsCommand(mode, count, pts, paint));
 }

 void SkDebugCanvas::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
                                   const SkPaint& paint) {
     this->addDrawCommand(new SkDrawPosTextCommand(text, byteLength, pos, paint));
 }

 void SkDebugCanvas::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
                                    SkScalar constY, const SkPaint& paint) {
     this->addDrawCommand(
         new SkDrawPosTextHCommand(text, byteLength, xpos, constY, paint));
 }

 void SkDebugCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
     // NOTE(chudy): Messing up when renamed to DrawRect... Why?
     addDrawCommand(new SkDrawRectCommand(rect, paint));
 }

 void SkDebugCanvas::onDrawRRect(const SkRRect& rrect, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawRRectCommand(rrect, paint));
 }

 void SkDebugCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
                                  const SkPaint& paint) {
     this->addDrawCommand(new SkDrawDRRectCommand(outer, inner, paint));
 }

 void SkDebugCanvas::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
                                const SkPaint& paint) {
     this->addDrawCommand(new SkDrawTextCommand(text, byteLength, x, y, paint));
 }

 void SkDebugCanvas::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                      const SkMatrix* matrix, const SkPaint& paint) {
     this->addDrawCommand(
         new SkDrawTextOnPathCommand(text, byteLength, path, matrix, paint));
 }

 void SkDebugCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                                    const SkPaint& paint) {
     this->addDrawCommand(new SkDrawTextBlobCommand(blob, x, y, paint));
 }

 void SkDebugCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                                 const SkPoint texCoords[4], SkXfermode* xmode,
                                 const SkPaint& paint) {
     this->addDrawCommand(new SkDrawPatchCommand(cubics, colors, texCoords, xmode, paint));
 }

 void SkDebugCanvas::onDrawVertices(VertexMode vmode, int vertexCount, const SkPoint vertices[],
                                    const SkPoint texs[], const SkColor colors[],
                                    SkXfermode*, const uint16_t indices[], int indexCount,
                                    const SkPaint& paint) {
     this->addDrawCommand(new SkDrawVerticesCommand(vmode, vertexCount, vertices,
                          texs, colors, nullptr, indices, indexCount, paint));
 }

 void SkDebugCanvas::willRestore() {
     this->addDrawCommand(new SkRestoreCommand());
     this->INHERITED::willRestore();
 }

 void SkDebugCanvas::willSave() {
     this->addDrawCommand(new SkSaveCommand());
     this->INHERITED::willSave();
 }

 SkCanvas::SaveLayerStrategy SkDebugCanvas::getSaveLayerStrategy(const SaveLayerRec& rec) {
     this->addDrawCommand(new SkSaveLayerCommand(rec));
     (void)this->INHERITED::getSaveLayerStrategy(rec);
     // No need for a full layer.
     return kNoLayer_SaveLayerStrategy;
 }

 void SkDebugCanvas::didSetMatrix(const SkMatrix& matrix) {
     this->addDrawCommand(new SkSetMatrixCommand(matrix));
     this->INHERITED::didSetMatrix(matrix);
 }

 void SkDebugCanvas::toggleCommand(int index, bool toggle) {
     SkASSERT(index < fCommandVector.count());
     fCommandVector[index]->setVisible(toggle);
 }

 static const char* gFillTypeStrs[] = {
     "kWinding_FillType",
     "kEvenOdd_FillType",
     "kInverseWinding_FillType",
     "kInverseEvenOdd_FillType"
 };

 static const char* gOpStrs[] = {
     "kDifference_PathOp",
     "kIntersect_PathOp",
     "kUnion_PathOp",
     "kXor_PathOp",
     "kReverseDifference_PathOp",
 };

 static const char kHTML4SpaceIndent[] = "&nbsp;&nbsp;&nbsp;&nbsp;";

 void SkDebugCanvas::outputScalar(SkScalar num) {
     if (num == (int) num) {
         fClipStackData.appendf("%d", (int) num);
     } else {
         SkString str;
         str.printf("%1.9g", num);
         int width = (int) str.size();
         const char* cStr = str.c_str();
         while (cStr[width - 1] == '0') {
             --width;
         }
         str.resize(width);
         fClipStackData.appendf("%sf", str.c_str());
     }
 }

 void SkDebugCanvas::outputPointsCommon(const SkPoint* pts, int count) {
     for (int index = 0; index < count; ++index) {
         this->outputScalar(pts[index].fX);
         fClipStackData.appendf(", ");
         this->outputScalar(pts[index].fY);
         if (index + 1 < count) {
             fClipStackData.appendf(", ");
         }
     }
 }

 void SkDebugCanvas::outputPoints(const SkPoint* pts, int count) {
     this->outputPointsCommon(pts, count);
     fClipStackData.appendf(");<br>");
 }

 void SkDebugCanvas::outputConicPoints(const SkPoint* pts, SkScalar weight) {
     this->outputPointsCommon(pts, 2);
     fClipStackData.appendf(", ");
     this->outputScalar(weight);
     fClipStackData.appendf(");<br>");
 }

 void SkDebugCanvas::addPathData(const SkPath& path, const char* pathName) {
     SkPath::RawIter iter(path);
     SkPath::FillType fillType = path.getFillType();
     fClipStackData.appendf("%sSkPath %s;<br>", kHTML4SpaceIndent, pathName);
     fClipStackData.appendf("%s%s.setFillType(SkPath::%s);<br>", kHTML4SpaceIndent, pathName,
             gFillTypeStrs[fillType]);
     iter.setPath(path);
     uint8_t verb;
     SkPoint pts[4];
     while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
         switch (verb) {
             case SkPath::kMove_Verb:
                 fClipStackData.appendf("%s%s.moveTo(", kHTML4SpaceIndent, pathName);
                 this->outputPoints(&pts[0], 1);
                 continue;
             case SkPath::kLine_Verb:
                 fClipStackData.appendf("%s%s.lineTo(", kHTML4SpaceIndent, pathName);
                 this->outputPoints(&pts[1], 1);
                 break;
             case SkPath::kQuad_Verb:
                 fClipStackData.appendf("%s%s.quadTo(", kHTML4SpaceIndent, pathName);
                 this->outputPoints(&pts[1], 2);
                 break;
             case SkPath::kConic_Verb:
                 fClipStackData.appendf("%s%s.conicTo(", kHTML4SpaceIndent, pathName);
                 this->outputConicPoints(&pts[1], iter.conicWeight());
                 break;
             case SkPath::kCubic_Verb:
                 fClipStackData.appendf("%s%s.cubicTo(", kHTML4SpaceIndent, pathName);
                 this->outputPoints(&pts[1], 3);
                 break;
             case SkPath::kClose_Verb:
                 fClipStackData.appendf("%s%s.close();<br>", kHTML4SpaceIndent, pathName);
                 break;
             default:
                 SkDEBUGFAIL("bad verb");
                 return;
         }
     }
 }

 void SkDebugCanvas::addClipStackData(const SkPath& devPath, const SkPath& operand,
                                      SkRegion::Op elementOp) {
     if (elementOp == SkRegion::kReplace_Op) {
         if (!lastClipStackData(devPath)) {
             fSaveDevPath = operand;
         }
         fCalledAddStackData = false;
     } else {
         fClipStackData.appendf("<br>static void test(skiatest::Reporter* reporter,"
             " const char* filename) {<br>");
         addPathData(fCalledAddStackData ? devPath : fSaveDevPath, "path");
         addPathData(operand, "pathB");
         fClipStackData.appendf("%stestPathOp(reporter, path, pathB, %s, filename);<br>",
             kHTML4SpaceIndent, gOpStrs[elementOp]);
         fClipStackData.appendf("}<br>");
         fCalledAddStackData = true;
     }
 }

 bool SkDebugCanvas::lastClipStackData(const SkPath& devPath) {
     if (fCalledAddStackData) {
         fClipStackData.appendf("<br>");
         addPathData(devPath, "pathOut");
         return true;
     }
     return false;
 }
	/*
	* Copyright 2012 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkClipStack.h"
	#include "SkDebugCanvas.h"
	#include "SkDrawCommand.h"
	#include "SkDevice.h"
	#include "SkPaintFilterCanvas.h"
	#include "SkOverdrawMode.h"

	class DebugPaintFilterCanvas : public SkPaintFilterCanvas {
	public:
	DebugPaintFilterCanvas(int width,
	int height,
	bool overdrawViz,
	bool overrideFilterQuality,
	SkFilterQuality quality)
	: INHERITED(width, height)
	, fOverdrawXfermode(overdrawViz ? SkOverdrawMode::Create() : nullptr)
	, fOverrideFilterQuality(overrideFilterQuality)
	, fFilterQuality(quality) {}

	protected:
	bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type) const override {
	if (*paint) {
	if (nullptr != fOverdrawXfermode.get()) {
	paint->writable()->setAntiAlias(false);
	paint->writable()->setXfermode(fOverdrawXfermode.get());
	}

	if (fOverrideFilterQuality) {
	paint->writable()->setFilterQuality(fFilterQuality);
	}
	}
	return true;
	}

	void onDrawPicture(const SkPicture* picture,
	const SkMatrix* matrix,
	const SkPaint* paint) override {
	// We need to replay the picture onto this canvas in order to filter its internal paints.
	this->SkCanvas::onDrawPicture(picture, matrix, paint);
	}

	private:
	SkAutoTUnref<SkXfermode> fOverdrawXfermode;

	bool fOverrideFilterQuality;
	SkFilterQuality fFilterQuality;

	typedef SkPaintFilterCanvas INHERITED;
	};

	SkDebugCanvas::SkDebugCanvas(int width, int height)
	: INHERITED(width, height)
	, fPicture(nullptr)
	, fFilter(false)
	, fMegaVizMode(false)
	, fOverdrawViz(false)
	, fOverrideFilterQuality(false)
	, fFilterQuality(kNone_SkFilterQuality) {
	fUserMatrix.reset();

	// SkPicturePlayback uses the base-class' quickReject calls to cull clipped
	// operations. This can lead to problems in the debugger which expects all
	// the operations in the captured skp to appear in the debug canvas. To
	// circumvent this we create a wide open clip here (an empty clip rect
	// is not sufficient).
	// Internally, the SkRect passed to clipRect is converted to an SkIRect and
	// rounded out. The following code creates a nearly maximal rect that will
	// not get collapsed by the coming conversions (Due to precision loss the
	// inset has to be surprisingly large).
	SkIRect largeIRect = SkIRect::MakeLargest();
	largeIRect.inset(1024, 1024);
	SkRect large = SkRect::Make(largeIRect);
	#ifdef SK_DEBUG
	SkASSERT(!large.roundOut().isEmpty());
	#endif
	// call the base class' version to avoid adding a draw command
	this->INHERITED::onClipRect(large, SkRegion::kReplace_Op, kHard_ClipEdgeStyle);
	}

	SkDebugCanvas::~SkDebugCanvas() {
	fCommandVector.deleteAll();
	}

	void SkDebugCanvas::addDrawCommand(SkDrawCommand* command) {
	fCommandVector.push(command);
	}

	void SkDebugCanvas::draw(SkCanvas* canvas) {
	if (!fCommandVector.isEmpty()) {
	this->drawTo(canvas, fCommandVector.count() - 1);
	}
	}

	void SkDebugCanvas::applyUserTransform(SkCanvas* canvas) {
	canvas->concat(fUserMatrix);
	}

	int SkDebugCanvas::getCommandAtPoint(int x, int y, int index) {
	SkBitmap bitmap;
	bitmap.allocPixels(SkImageInfo::MakeN32Premul(1, 1));

	SkCanvas canvas(bitmap);
	canvas.translate(SkIntToScalar(-x), SkIntToScalar(-y));
	this->applyUserTransform(&canvas);

	int layer = 0;
	SkColor prev = bitmap.getColor(0,0);
	for (int i = 0; i < index; i++) {
	if (fCommandVector[i]->isVisible()) {
	fCommandVector[i]->setUserMatrix(fUserMatrix);
	fCommandVector[i]->execute(&canvas);
	}
	if (prev != bitmap.getColor(0,0)) {
	layer = i;
	}
	prev = bitmap.getColor(0,0);
	}
	return layer;
	}

	class SkDebugClipVisitor : public SkCanvas::ClipVisitor {
	public:
	SkDebugClipVisitor(SkCanvas* canvas) : fCanvas(canvas) {}

	void clipRect(const SkRect& r, SkRegion::Op, bool doAA) override {
	SkPaint p;
	p.setColor(SK_ColorRED);
	p.setStyle(SkPaint::kStroke_Style);
	p.setAntiAlias(doAA);
	fCanvas->drawRect(r, p);
	}
	void clipRRect(const SkRRect& rr, SkRegion::Op, bool doAA) override {
	SkPaint p;
	p.setColor(SK_ColorGREEN);
	p.setStyle(SkPaint::kStroke_Style);
	p.setAntiAlias(doAA);
	fCanvas->drawRRect(rr, p);
	}
	void clipPath(const SkPath& path, SkRegion::Op, bool doAA) override {
	SkPaint p;
	p.setColor(SK_ColorBLUE);
	p.setStyle(SkPaint::kStroke_Style);
	p.setAntiAlias(doAA);
	fCanvas->drawPath(path, p);
	}

	protected:
	SkCanvas* fCanvas;

	private:
	typedef SkCanvas::ClipVisitor INHERITED;
	};

	// set up the saveLayer commands so that the active ones
	// return true in their 'active' method
	void SkDebugCanvas::markActiveCommands(int index) {
	fActiveLayers.rewind();

	for (int i = 0; i < fCommandVector.count(); ++i) {
	fCommandVector[i]->setActive(false);
	}

	for (int i = 0; i < index; ++i) {
	SkDrawCommand::Action result = fCommandVector[i]->action();
	if (SkDrawCommand::kPushLayer_Action == result) {
	fActiveLayers.push(fCommandVector[i]);
	} else if (SkDrawCommand::kPopLayer_Action == result) {
	fActiveLayers.pop();
	}
	}

	for (int i = 0; i < fActiveLayers.count(); ++i) {
	fActiveLayers[i]->setActive(true);
	}

	}

	void SkDebugCanvas::drawTo(SkCanvas* canvas, int index) {
	SkASSERT(!fCommandVector.isEmpty());
	SkASSERT(index < fCommandVector.count());

	int saveCount = canvas->save();

	SkRect windowRect = SkRect::MakeWH(SkIntToScalar(canvas->getBaseLayerSize().width()),
	SkIntToScalar(canvas->getBaseLayerSize().height()));

	bool pathOpsMode = getAllowSimplifyClip();
	canvas->setAllowSimplifyClip(pathOpsMode);
	canvas->clear(SK_ColorTRANSPARENT);
	canvas->resetMatrix();
	if (!windowRect.isEmpty()) {
	canvas->clipRect(windowRect, SkRegion::kReplace_Op);
	}
	this->applyUserTransform(canvas);

	if (fPaintFilterCanvas) {
	fPaintFilterCanvas->addCanvas(canvas);
	canvas = fPaintFilterCanvas.get();
	}

	if (fMegaVizMode) {
	this->markActiveCommands(index);
	}

	for (int i = 0; i <= index; i++) {
	if (i == index && fFilter) {
	canvas->clear(0xAAFFFFFF);
	}

	if (fCommandVector[i]->isVisible()) {
	if (fMegaVizMode && fCommandVector[i]->active()) {
	// "active" commands execute their visualization behaviors:
	// All active saveLayers get replaced with saves so all draws go to the
	// visible canvas.
	// All active culls draw their cull box
	fCommandVector[i]->vizExecute(canvas);
	} else {
	fCommandVector[i]->setUserMatrix(fUserMatrix);
	fCommandVector[i]->execute(canvas);
	}
	}
	}

	if (fMegaVizMode) {
	canvas->save();
	// nuke the CTM
	canvas->resetMatrix();
	// turn off clipping
	if (!windowRect.isEmpty()) {
	SkRect r = windowRect;
	r.outset(SK_Scalar1, SK_Scalar1);
	canvas->clipRect(r, SkRegion::kReplace_Op);
	}
	// visualize existing clips
	SkDebugClipVisitor visitor(canvas);

	canvas->replayClips(&visitor);

	canvas->restore();
	}
	if (pathOpsMode) {
	this->resetClipStackData();
	const SkClipStack* clipStack = canvas->getClipStack();
	SkClipStack::Iter iter(*clipStack, SkClipStack::Iter::kBottom_IterStart);
	const SkClipStack::Element* element;
	SkPath devPath;
	while ((element = iter.next())) {
	SkClipStack::Element::Type type = element->getType();
	SkPath operand;
	if (type != SkClipStack::Element::kEmpty_Type) {
	element->asPath(&operand);
	}
	SkRegion::Op elementOp = element->getOp();
	this->addClipStackData(devPath, operand, elementOp);
	if (elementOp == SkRegion::kReplace_Op) {
	devPath = operand;
	} else {
	Op(devPath, operand, (SkPathOp) elementOp, &devPath);
	}
	}
	this->lastClipStackData(devPath);
	}
	fMatrix = canvas->getTotalMatrix();
	if (!canvas->getClipDeviceBounds(&fClip)) {
	fClip.setEmpty();
	}

	canvas->restoreToCount(saveCount);

	if (fPaintFilterCanvas) {
	fPaintFilterCanvas->removeAll();
	}
	}

	void SkDebugCanvas::deleteDrawCommandAt(int index) {
	SkASSERT(index < fCommandVector.count());
	delete fCommandVector[index];
	fCommandVector.remove(index);
	}

	SkDrawCommand* SkDebugCanvas::getDrawCommandAt(int index) {
	SkASSERT(index < fCommandVector.count());
	return fCommandVector[index];
	}

	void SkDebugCanvas::setDrawCommandAt(int index, SkDrawCommand* command) {
	SkASSERT(index < fCommandVector.count());
	delete fCommandVector[index];
	fCommandVector[index] = command;
	}

	const SkTDArray<SkString> SkDebugCanvas::getCommandInfo(int index) const {
	SkASSERT(index < fCommandVector.count());
	return fCommandVector[index]->Info();
	}

	bool SkDebugCanvas::getDrawCommandVisibilityAt(int index) {
	SkASSERT(index < fCommandVector.count());
	return fCommandVector[index]->isVisible();
	}

	const SkTDArray <SkDrawCommand*>& SkDebugCanvas::getDrawCommands() const {
	return fCommandVector;
	}

	SkTDArray <SkDrawCommand*>& SkDebugCanvas::getDrawCommands() {
	return fCommandVector;
	}

	void SkDebugCanvas::updatePaintFilterCanvas() {
	if (!fOverdrawViz && !fOverrideFilterQuality) {
	fPaintFilterCanvas.reset(nullptr);
	return;
	}

	const SkImageInfo info = this->imageInfo();
	fPaintFilterCanvas.reset(new DebugPaintFilterCanvas(info.width(), info.height(), fOverdrawViz,
	fOverrideFilterQuality, fFilterQuality));
	}

	void SkDebugCanvas::setOverdrawViz(bool overdrawViz) {
	if (fOverdrawViz == overdrawViz) {
	return;
	}

	fOverdrawViz = overdrawViz;
	this->updatePaintFilterCanvas();
	}

	void SkDebugCanvas::overrideTexFiltering(bool overrideTexFiltering, SkFilterQuality quality) {
	if (fOverrideFilterQuality == overrideTexFiltering && fFilterQuality == quality) {
	return;
	}

	fOverrideFilterQuality = overrideTexFiltering;
	fFilterQuality = quality;
	this->updatePaintFilterCanvas();
	}

	void SkDebugCanvas::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	this->addDrawCommand(new SkClipPathCommand(path, op, kSoft_ClipEdgeStyle == edgeStyle));
	}

	void SkDebugCanvas::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	this->addDrawCommand(new SkClipRectCommand(rect, op, kSoft_ClipEdgeStyle == edgeStyle));
	}

	void SkDebugCanvas::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	this->addDrawCommand(new SkClipRRectCommand(rrect, op, kSoft_ClipEdgeStyle == edgeStyle));
	}

	void SkDebugCanvas::onClipRegion(const SkRegion& region, SkRegion::Op op) {
	this->addDrawCommand(new SkClipRegionCommand(region, op));
	}

	void SkDebugCanvas::didConcat(const SkMatrix& matrix) {
	this->addDrawCommand(new SkConcatCommand(matrix));
	this->INHERITED::didConcat(matrix);
	}

	void SkDebugCanvas::onDrawBitmap(const SkBitmap& bitmap, SkScalar left,
	SkScalar top, const SkPaint* paint) {
	this->addDrawCommand(new SkDrawBitmapCommand(bitmap, left, top, paint));
	}

	void SkDebugCanvas::onDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
	const SkPaint* paint, SrcRectConstraint constraint) {
	this->addDrawCommand(new SkDrawBitmapRectCommand(bitmap, src, dst, paint,
	(SrcRectConstraint)constraint));
	}

	void SkDebugCanvas::onDrawBitmapNine(const SkBitmap& bitmap, const SkIRect& center,
	const SkRect& dst, const SkPaint* paint) {
	this->addDrawCommand(new SkDrawBitmapNineCommand(bitmap, center, dst, paint));
	}

	void SkDebugCanvas::onDrawImage(const SkImage* image, SkScalar left, SkScalar top,
	const SkPaint* paint) {
	this->addDrawCommand(new SkDrawImageCommand(image, left, top, paint));
	}

	void SkDebugCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
	const SkPaint* paint, SrcRectConstraint constraint) {
	this->addDrawCommand(new SkDrawImageRectCommand(image, src, dst, paint, constraint));
	}

	void SkDebugCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
	this->addDrawCommand(new SkDrawOvalCommand(oval, paint));
	}

	void SkDebugCanvas::onDrawPaint(const SkPaint& paint) {
	this->addDrawCommand(new SkDrawPaintCommand(paint));
	}

	void SkDebugCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
	this->addDrawCommand(new SkDrawPathCommand(path, paint));
	}

	void SkDebugCanvas::onDrawPicture(const SkPicture* picture,
	const SkMatrix* matrix,
	const SkPaint* paint) {
	this->addDrawCommand(new SkBeginDrawPictureCommand(picture, matrix, paint));
	this->INHERITED::onDrawPicture(picture, matrix, paint);
	this->addDrawCommand(new SkEndDrawPictureCommand(SkToBool(matrix) \|\| SkToBool(paint)));
	}

	void SkDebugCanvas::onDrawPoints(PointMode mode, size_t count,
	const SkPoint pts[], const SkPaint& paint) {
	this->addDrawCommand(new SkDrawPointsCommand(mode, count, pts, paint));
	}

	void SkDebugCanvas::onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawPosTextCommand(text, byteLength, pos, paint));
	}

	void SkDebugCanvas::onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
	SkScalar constY, const SkPaint& paint) {
	this->addDrawCommand(
	new SkDrawPosTextHCommand(text, byteLength, xpos, constY, paint));
	}

	void SkDebugCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
	// NOTE(chudy): Messing up when renamed to DrawRect... Why?
	addDrawCommand(new SkDrawRectCommand(rect, paint));
	}

	void SkDebugCanvas::onDrawRRect(const SkRRect& rrect, const SkPaint& paint) {
	this->addDrawCommand(new SkDrawRRectCommand(rrect, paint));
	}

	void SkDebugCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawDRRectCommand(outer, inner, paint));
	}

	void SkDebugCanvas::onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawTextCommand(text, byteLength, x, y, paint));
	}

	void SkDebugCanvas::onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
	const SkMatrix* matrix, const SkPaint& paint) {
	this->addDrawCommand(
	new SkDrawTextOnPathCommand(text, byteLength, path, matrix, paint));
	}

	void SkDebugCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawTextBlobCommand(blob, x, y, paint));
	}

	void SkDebugCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
	const SkPoint texCoords[4], SkXfermode* xmode,
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawPatchCommand(cubics, colors, texCoords, xmode, paint));
	}

	void SkDebugCanvas::onDrawVertices(VertexMode vmode, int vertexCount, const SkPoint vertices[],
	const SkPoint texs[], const SkColor colors[],
	SkXfermode*, const uint16_t indices[], int indexCount,
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawVerticesCommand(vmode, vertexCount, vertices,
	texs, colors, nullptr, indices, indexCount, paint));
	}

	void SkDebugCanvas::willRestore() {
	this->addDrawCommand(new SkRestoreCommand());
	this->INHERITED::willRestore();
	}

	void SkDebugCanvas::willSave() {
	this->addDrawCommand(new SkSaveCommand());
	this->INHERITED::willSave();
	}

	SkCanvas::SaveLayerStrategy SkDebugCanvas::getSaveLayerStrategy(const SaveLayerRec& rec) {
	this->addDrawCommand(new SkSaveLayerCommand(rec));
	(void)this->INHERITED::getSaveLayerStrategy(rec);
	// No need for a full layer.
	return kNoLayer_SaveLayerStrategy;
	}

	void SkDebugCanvas::didSetMatrix(const SkMatrix& matrix) {
	this->addDrawCommand(new SkSetMatrixCommand(matrix));
	this->INHERITED::didSetMatrix(matrix);
	}

	void SkDebugCanvas::toggleCommand(int index, bool toggle) {
	SkASSERT(index < fCommandVector.count());
	fCommandVector[index]->setVisible(toggle);
	}

	static const char* gFillTypeStrs[] = {
	"kWinding_FillType",
	"kEvenOdd_FillType",
	"kInverseWinding_FillType",
	"kInverseEvenOdd_FillType"
	};

	static const char* gOpStrs[] = {
	"kDifference_PathOp",
	"kIntersect_PathOp",
	"kUnion_PathOp",
	"kXor_PathOp",
	"kReverseDifference_PathOp",
	};

	static const char kHTML4SpaceIndent[] = "    ";

	void SkDebugCanvas::outputScalar(SkScalar num) {
	if (num == (int) num) {
	fClipStackData.appendf("%d", (int) num);
	} else {
	SkString str;
	str.printf("%1.9g", num);
	int width = (int) str.size();
	const char* cStr = str.c_str();
	while (cStr[width - 1] == '0') {
	--width;
	}
	str.resize(width);
	fClipStackData.appendf("%sf", str.c_str());
	}
	}

	void SkDebugCanvas::outputPointsCommon(const SkPoint* pts, int count) {
	for (int index = 0; index < count; ++index) {
	this->outputScalar(pts[index].fX);
	fClipStackData.appendf(", ");
	this->outputScalar(pts[index].fY);
	if (index + 1 < count) {
	fClipStackData.appendf(", ");
	}
	}
	}

	void SkDebugCanvas::outputPoints(const SkPoint* pts, int count) {
	this->outputPointsCommon(pts, count);
	fClipStackData.appendf(");<br>");
	}

	void SkDebugCanvas::outputConicPoints(const SkPoint* pts, SkScalar weight) {
	this->outputPointsCommon(pts, 2);
	fClipStackData.appendf(", ");
	this->outputScalar(weight);
	fClipStackData.appendf(");<br>");
	}

	void SkDebugCanvas::addPathData(const SkPath& path, const char* pathName) {
	SkPath::RawIter iter(path);
	SkPath::FillType fillType = path.getFillType();
	fClipStackData.appendf("%sSkPath %s;<br>", kHTML4SpaceIndent, pathName);
	fClipStackData.appendf("%s%s.setFillType(SkPath::%s);<br>", kHTML4SpaceIndent, pathName,
	gFillTypeStrs[fillType]);
	iter.setPath(path);
	uint8_t verb;
	SkPoint pts[4];
	while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
	switch (verb) {
	case SkPath::kMove_Verb:
	fClipStackData.appendf("%s%s.moveTo(", kHTML4SpaceIndent, pathName);
	this->outputPoints(&pts[0], 1);
	continue;
	case SkPath::kLine_Verb:
	fClipStackData.appendf("%s%s.lineTo(", kHTML4SpaceIndent, pathName);
	this->outputPoints(&pts[1], 1);
	break;
	case SkPath::kQuad_Verb:
	fClipStackData.appendf("%s%s.quadTo(", kHTML4SpaceIndent, pathName);
	this->outputPoints(&pts[1], 2);
	break;
	case SkPath::kConic_Verb:
	fClipStackData.appendf("%s%s.conicTo(", kHTML4SpaceIndent, pathName);
	this->outputConicPoints(&pts[1], iter.conicWeight());
	break;
	case SkPath::kCubic_Verb:
	fClipStackData.appendf("%s%s.cubicTo(", kHTML4SpaceIndent, pathName);
	this->outputPoints(&pts[1], 3);
	break;
	case SkPath::kClose_Verb:
	fClipStackData.appendf("%s%s.close();<br>", kHTML4SpaceIndent, pathName);
	break;
	default:
	SkDEBUGFAIL("bad verb");
	return;
	}
	}
	}

	void SkDebugCanvas::addClipStackData(const SkPath& devPath, const SkPath& operand,
	SkRegion::Op elementOp) {
	if (elementOp == SkRegion::kReplace_Op) {
	if (!lastClipStackData(devPath)) {
	fSaveDevPath = operand;
	}
	fCalledAddStackData = false;
	} else {
	fClipStackData.appendf("<br>static void test(skiatest::Reporter* reporter,"
	" const char* filename) {<br>");
	addPathData(fCalledAddStackData ? devPath : fSaveDevPath, "path");
	addPathData(operand, "pathB");
	fClipStackData.appendf("%stestPathOp(reporter, path, pathB, %s, filename);<br>",
	kHTML4SpaceIndent, gOpStrs[elementOp]);
	fClipStackData.appendf("}<br>");
	fCalledAddStackData = true;
	}
	}

	bool SkDebugCanvas::lastClipStackData(const SkPath& devPath) {
	if (fCalledAddStackData) {
	fClipStackData.appendf("<br>");
	addPathData(devPath, "pathOut");
	return true;
	}
	return false;
	}