tools/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 "SkCanvasPriv.h"
 #include "SkDebugCanvas.h"
 #include "SkDrawCommand.h"
 #include "SkPaintFilterCanvas.h"
 #include "SkPicture.h"
 #include "SkRectPriv.h"
 #include "SkTextBlob.h"
 #include "SkClipOpPriv.h"

 #include "GrAuditTrail.h"
 #include "GrContext.h"
 #include "GrRenderTargetContext.h"

 #define SKDEBUGCANVAS_VERSION                     1
 #define SKDEBUGCANVAS_ATTRIBUTE_VERSION           "version"
 #define SKDEBUGCANVAS_ATTRIBUTE_COMMANDS          "commands"
 #define SKDEBUGCANVAS_ATTRIBUTE_AUDITTRAIL        "auditTrail"

 class DebugPaintFilterCanvas : public SkPaintFilterCanvas {
 public:
     DebugPaintFilterCanvas(SkCanvas* canvas,
                            bool overdrawViz)
         : INHERITED(canvas)
         , fOverdrawViz(overdrawViz) {}

 protected:
     bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type) const override {
         if (*paint) {
             if (fOverdrawViz) {
                 paint->writable()->setColor(SK_ColorRED);
                 paint->writable()->setAlpha(0x08);
                 paint->writable()->setBlendMode(SkBlendMode::kSrcOver);
             }
         }
         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:
     bool fOverdrawViz;

     typedef SkPaintFilterCanvas INHERITED;
 };

 SkDebugCanvas::SkDebugCanvas(int width, int height)
         : INHERITED(width, height)
         , fOverdrawViz(false)
         , fClipVizColor(SK_ColorTRANSPARENT)
         , fDrawGpuOpBounds(false) {
     // 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 = SkRectPriv::MakeILarge();
     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, kReplace_SkClipOp, 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::drawTo(SkCanvas* originalCanvas, int index, int m) {
     SkASSERT(!fCommandVector.isEmpty());
     SkASSERT(index < fCommandVector.count());

     int saveCount = originalCanvas->save();

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

     originalCanvas->clear(SK_ColorWHITE);
     originalCanvas->resetMatrix();
     if (!windowRect.isEmpty()) {
         originalCanvas->clipRect(windowRect, kReplace_SkClipOp);
     }

     DebugPaintFilterCanvas filterCanvas(originalCanvas, fOverdrawViz);

     // If we have a GPU backend we can also visualize the op information
     GrAuditTrail* at = nullptr;
     if (fDrawGpuOpBounds || m != -1) {
         // The audit trail must be obtained from the original canvas.
         at = this->getAuditTrail(originalCanvas);
     }

     for (int i = 0; i <= index; i++) {
         // We need to flush any pending operations, or they might combine with commands below.
         // Previous operations were not registered with the audit trail when they were
         // created, so if we allow them to combine, the audit trail will fail to find them.
         filterCanvas.flush();

         GrAuditTrail::AutoCollectOps* acb = nullptr;
         if (at) {
             acb = new GrAuditTrail::AutoCollectOps(at, i);
         }

         if (fCommandVector[i]->isVisible()) {
             fCommandVector[i]->execute(&filterCanvas);
         }
         if (at && acb) {
             delete acb;
         }
     }

     if (SkColorGetA(fClipVizColor) != 0) {
         filterCanvas.save();
         #define LARGE_COORD 1000000000
         filterCanvas.clipRect(
                 SkRect::MakeLTRB(-LARGE_COORD, -LARGE_COORD, LARGE_COORD, LARGE_COORD),
                 kReverseDifference_SkClipOp);
         SkPaint clipPaint;
         clipPaint.setColor(fClipVizColor);
         filterCanvas.drawPaint(clipPaint);
         filterCanvas.restore();
     }

     fMatrix = filterCanvas.getTotalMatrix();
     fClip = filterCanvas.getDeviceClipBounds();
     filterCanvas.restoreToCount(saveCount);

     // draw any ops if required and issue a full reset onto GrAuditTrail
     if (at) {
         // just in case there is global reordering, we flush the canvas before querying
         // GrAuditTrail
         GrAuditTrail::AutoEnable ae(at);
         filterCanvas.flush();

         // we pick three colorblind-safe colors, 75% alpha
         static const SkColor kTotalBounds = SkColorSetARGB(0xC0, 0x6A, 0x3D, 0x9A);
         static const SkColor kCommandOpBounds = SkColorSetARGB(0xC0, 0xE3, 0x1A, 0x1C);
         static const SkColor kOtherOpBounds = SkColorSetARGB(0xC0, 0xFF, 0x7F, 0x00);

         // get the render target of the top device (from the original canvas) so we can ignore ops
         // drawn offscreen
         GrRenderTargetContext* rtc =
                 originalCanvas->internal_private_accessTopLayerRenderTargetContext();
         GrSurfaceProxy::UniqueID proxyID = rtc->asSurfaceProxy()->uniqueID();

         // get the bounding boxes to draw
         SkTArray<GrAuditTrail::OpInfo> childrenBounds;
         if (m == -1) {
             at->getBoundsByClientID(&childrenBounds, index);
         } else {
             // the client wants us to draw the mth op
             at->getBoundsByOpListID(&childrenBounds.push_back(), m);
         }
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setStrokeWidth(1);
         for (int i = 0; i < childrenBounds.count(); i++) {
             if (childrenBounds[i].fProxyUniqueID != proxyID) {
                 // offscreen draw, ignore for now
                 continue;
             }
             paint.setColor(kTotalBounds);
             filterCanvas.drawRect(childrenBounds[i].fBounds, paint);
             for (int j = 0; j < childrenBounds[i].fOps.count(); j++) {
                 const GrAuditTrail::OpInfo::Op& op = childrenBounds[i].fOps[j];
                 if (op.fClientID != index) {
                     paint.setColor(kOtherOpBounds);
                 } else {
                     paint.setColor(kCommandOpBounds);
                 }
                 filterCanvas.drawRect(op.fBounds, paint);
             }
         }
     }
     this->cleanupAuditTrail(originalCanvas);
 }

 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];
 }

 GrAuditTrail* SkDebugCanvas::getAuditTrail(SkCanvas* canvas) {
     GrAuditTrail* at = nullptr;
     GrContext* ctx = canvas->getGrContext();
     if (ctx) {
         at = ctx->contextPriv().getAuditTrail();
     }
     return at;
 }

 void SkDebugCanvas::drawAndCollectOps(int n, SkCanvas* canvas) {
     GrAuditTrail* at = this->getAuditTrail(canvas);
     if (at) {
         // loop over all of the commands and draw them, this is to collect reordering
         // information
         for (int i = 0; i < this->getSize() && i <= n; i++) {
             GrAuditTrail::AutoCollectOps enable(at, i);
             fCommandVector[i]->execute(canvas);
         }

         // in case there is some kind of global reordering
         {
             GrAuditTrail::AutoEnable ae(at);
             canvas->flush();
         }
     }
 }

 void SkDebugCanvas::cleanupAuditTrail(SkCanvas* canvas) {
     GrAuditTrail* at = this->getAuditTrail(canvas);
     if (at) {
         GrAuditTrail::AutoEnable ae(at);
         at->fullReset();
     }
 }

 Json::Value SkDebugCanvas::toJSON(UrlDataManager& urlDataManager, int n, SkCanvas* canvas) {
     this->drawAndCollectOps(n, canvas);

     // now collect json
     GrAuditTrail* at = this->getAuditTrail(canvas);
     Json::Value result = Json::Value(Json::objectValue);
     result[SKDEBUGCANVAS_ATTRIBUTE_VERSION] = Json::Value(SKDEBUGCANVAS_VERSION);
     Json::Value commands = Json::Value(Json::arrayValue);
     for (int i = 0; i < this->getSize() && i <= n; i++) {
         commands[i] = this->getDrawCommandAt(i)->toJSON(urlDataManager);
         if (at) {
             // TODO if this is inefficient we could add a method to GrAuditTrail which takes
             // a Json::Value and is only compiled in this file
             Json::Value parsedFromString;
             Json::Reader reader;
             SkAssertResult(reader.parse(at->toJson(i).c_str(), parsedFromString));

             commands[i][SKDEBUGCANVAS_ATTRIBUTE_AUDITTRAIL] = parsedFromString;
         }
     }
     this->cleanupAuditTrail(canvas);
     result[SKDEBUGCANVAS_ATTRIBUTE_COMMANDS] = commands;
     return result;
 }

 Json::Value SkDebugCanvas::toJSONOpList(int n, SkCanvas* canvas) {
     this->drawAndCollectOps(n, canvas);

     Json::Value parsedFromString;
     GrAuditTrail* at = this->getAuditTrail(canvas);
     if (at) {
         GrAuditTrail::AutoManageOpList enable(at);
         Json::Reader reader;
         SkAssertResult(reader.parse(at->toJson().c_str(), parsedFromString));
     }
     this->cleanupAuditTrail(canvas);
     return parsedFromString;
 }

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

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

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

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

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

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

 void SkDebugCanvas::onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) {
     this->addDrawCommand(new SkDrawAnnotationCommand(rect, key, sk_ref_sp(value)));
 }

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

 void SkDebugCanvas::onDrawBitmapLattice(const SkBitmap& bitmap, const Lattice& lattice,
                                         const SkRect& dst, const SkPaint* paint) {
     this->addDrawCommand(new SkDrawBitmapLatticeCommand(bitmap, lattice, dst, 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::onDrawImageLattice(const SkImage* image, const Lattice& lattice,
                                        const SkRect& dst, const SkPaint* paint) {
     this->addDrawCommand(new SkDrawImageLatticeCommand(image, lattice, dst, 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::onDrawImageNine(const SkImage* image, const SkIRect& center,
                                     const SkRect& dst, const SkPaint* paint) {
     this->addDrawCommand(new SkDrawImageNineCommand(image, center, dst, paint));
 }

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

 void SkDebugCanvas::onDrawArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle,
                                bool useCenter, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawArcCommand(oval, startAngle, sweepAngle, useCenter, 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::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawRegionCommand(region, paint));
 }

 void SkDebugCanvas::onDrawPicture(const SkPicture* picture,
                                   const SkMatrix* matrix,
                                   const SkPaint* paint) {
     this->addDrawCommand(new SkBeginDrawPictureCommand(picture, matrix, paint));
     SkAutoCanvasMatrixPaint acmp(this, matrix, paint, picture->cullRect());
     picture->playback(this);
     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::onDrawTextRSXform(const void* text, size_t byteLength, const SkRSXform xform[],
                                       const SkRect* cull, const SkPaint& paint) {
     this->addDrawCommand(new SkDrawTextRSXformCommand(text, byteLength, xform, cull, paint));
 }

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

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

 void SkDebugCanvas::onDrawVerticesObject(const SkVertices* vertices, SkBlendMode bmode,
                                          const SkPaint& paint) {
     this->addDrawCommand(new SkDrawVerticesCommand(sk_ref_sp(const_cast<SkVertices*>(vertices)),
                                                    bmode, paint));
 }

 void SkDebugCanvas::onDrawAtlas(const SkImage* image, const SkRSXform xform[], const SkRect tex[],
                                 const SkColor colors[], int count, SkBlendMode bmode,
                                 const SkRect* cull, const SkPaint* paint) {
     this->addDrawCommand(new SkDrawAtlasCommand(image, xform, tex, colors, count, bmode, cull,
                                                 paint));
 }

 void SkDebugCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
     this->addDrawCommand(new SkDrawShadowCommand(path, rec));
 }

 void SkDebugCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
     this->addDrawCommand(new SkDrawDrawableCommand(drawable, matrix));
 }

 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);
 }
	/*
	* 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 "SkCanvasPriv.h"
	#include "SkDebugCanvas.h"
	#include "SkDrawCommand.h"
	#include "SkPaintFilterCanvas.h"
	#include "SkPicture.h"
	#include "SkRectPriv.h"
	#include "SkTextBlob.h"
	#include "SkClipOpPriv.h"

	#include "GrAuditTrail.h"
	#include "GrContext.h"
	#include "GrRenderTargetContext.h"

	#define SKDEBUGCANVAS_VERSION 1
	#define SKDEBUGCANVAS_ATTRIBUTE_VERSION "version"
	#define SKDEBUGCANVAS_ATTRIBUTE_COMMANDS "commands"
	#define SKDEBUGCANVAS_ATTRIBUTE_AUDITTRAIL "auditTrail"

	class DebugPaintFilterCanvas : public SkPaintFilterCanvas {
	public:
	DebugPaintFilterCanvas(SkCanvas* canvas,
	bool overdrawViz)
	: INHERITED(canvas)
	, fOverdrawViz(overdrawViz) {}

	protected:
	bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type) const override {
	if (*paint) {
	if (fOverdrawViz) {
	paint->writable()->setColor(SK_ColorRED);
	paint->writable()->setAlpha(0x08);
	paint->writable()->setBlendMode(SkBlendMode::kSrcOver);
	}
	}
	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:
	bool fOverdrawViz;

	typedef SkPaintFilterCanvas INHERITED;
	};

	SkDebugCanvas::SkDebugCanvas(int width, int height)
	: INHERITED(width, height)
	, fOverdrawViz(false)
	, fClipVizColor(SK_ColorTRANSPARENT)
	, fDrawGpuOpBounds(false) {
	// 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 = SkRectPriv::MakeILarge();
	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, kReplace_SkClipOp, 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::drawTo(SkCanvas* originalCanvas, int index, int m) {
	SkASSERT(!fCommandVector.isEmpty());
	SkASSERT(index < fCommandVector.count());

	int saveCount = originalCanvas->save();

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

	originalCanvas->clear(SK_ColorWHITE);
	originalCanvas->resetMatrix();
	if (!windowRect.isEmpty()) {
	originalCanvas->clipRect(windowRect, kReplace_SkClipOp);
	}

	DebugPaintFilterCanvas filterCanvas(originalCanvas, fOverdrawViz);

	// If we have a GPU backend we can also visualize the op information
	GrAuditTrail* at = nullptr;
	if (fDrawGpuOpBounds \|\| m != -1) {
	// The audit trail must be obtained from the original canvas.
	at = this->getAuditTrail(originalCanvas);
	}

	for (int i = 0; i <= index; i++) {
	// We need to flush any pending operations, or they might combine with commands below.
	// Previous operations were not registered with the audit trail when they were
	// created, so if we allow them to combine, the audit trail will fail to find them.
	filterCanvas.flush();

	GrAuditTrail::AutoCollectOps* acb = nullptr;
	if (at) {
	acb = new GrAuditTrail::AutoCollectOps(at, i);
	}

	if (fCommandVector[i]->isVisible()) {
	fCommandVector[i]->execute(&filterCanvas);
	}
	if (at && acb) {
	delete acb;
	}
	}

	if (SkColorGetA(fClipVizColor) != 0) {
	filterCanvas.save();
	#define LARGE_COORD 1000000000
	filterCanvas.clipRect(
	SkRect::MakeLTRB(-LARGE_COORD, -LARGE_COORD, LARGE_COORD, LARGE_COORD),
	kReverseDifference_SkClipOp);
	SkPaint clipPaint;
	clipPaint.setColor(fClipVizColor);
	filterCanvas.drawPaint(clipPaint);
	filterCanvas.restore();
	}

	fMatrix = filterCanvas.getTotalMatrix();
	fClip = filterCanvas.getDeviceClipBounds();
	filterCanvas.restoreToCount(saveCount);

	// draw any ops if required and issue a full reset onto GrAuditTrail
	if (at) {
	// just in case there is global reordering, we flush the canvas before querying
	// GrAuditTrail
	GrAuditTrail::AutoEnable ae(at);
	filterCanvas.flush();

	// we pick three colorblind-safe colors, 75% alpha
	static const SkColor kTotalBounds = SkColorSetARGB(0xC0, 0x6A, 0x3D, 0x9A);
	static const SkColor kCommandOpBounds = SkColorSetARGB(0xC0, 0xE3, 0x1A, 0x1C);
	static const SkColor kOtherOpBounds = SkColorSetARGB(0xC0, 0xFF, 0x7F, 0x00);

	// get the render target of the top device (from the original canvas) so we can ignore ops
	// drawn offscreen
	GrRenderTargetContext* rtc =
	originalCanvas->internal_private_accessTopLayerRenderTargetContext();
	GrSurfaceProxy::UniqueID proxyID = rtc->asSurfaceProxy()->uniqueID();

	// get the bounding boxes to draw
	SkTArray<GrAuditTrail::OpInfo> childrenBounds;
	if (m == -1) {
	at->getBoundsByClientID(&childrenBounds, index);
	} else {
	// the client wants us to draw the mth op
	at->getBoundsByOpListID(&childrenBounds.push_back(), m);
	}
	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(1);
	for (int i = 0; i < childrenBounds.count(); i++) {
	if (childrenBounds[i].fProxyUniqueID != proxyID) {
	// offscreen draw, ignore for now
	continue;
	}
	paint.setColor(kTotalBounds);
	filterCanvas.drawRect(childrenBounds[i].fBounds, paint);
	for (int j = 0; j < childrenBounds[i].fOps.count(); j++) {
	const GrAuditTrail::OpInfo::Op& op = childrenBounds[i].fOps[j];
	if (op.fClientID != index) {
	paint.setColor(kOtherOpBounds);
	} else {
	paint.setColor(kCommandOpBounds);
	}
	filterCanvas.drawRect(op.fBounds, paint);
	}
	}
	}
	this->cleanupAuditTrail(originalCanvas);
	}

	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];
	}

	GrAuditTrail* SkDebugCanvas::getAuditTrail(SkCanvas* canvas) {
	GrAuditTrail* at = nullptr;
	GrContext* ctx = canvas->getGrContext();
	if (ctx) {
	at = ctx->contextPriv().getAuditTrail();
	}
	return at;
	}

	void SkDebugCanvas::drawAndCollectOps(int n, SkCanvas* canvas) {
	GrAuditTrail* at = this->getAuditTrail(canvas);
	if (at) {
	// loop over all of the commands and draw them, this is to collect reordering
	// information
	for (int i = 0; i < this->getSize() && i <= n; i++) {
	GrAuditTrail::AutoCollectOps enable(at, i);
	fCommandVector[i]->execute(canvas);
	}

	// in case there is some kind of global reordering
	{
	GrAuditTrail::AutoEnable ae(at);
	canvas->flush();
	}
	}
	}

	void SkDebugCanvas::cleanupAuditTrail(SkCanvas* canvas) {
	GrAuditTrail* at = this->getAuditTrail(canvas);
	if (at) {
	GrAuditTrail::AutoEnable ae(at);
	at->fullReset();
	}
	}

	Json::Value SkDebugCanvas::toJSON(UrlDataManager& urlDataManager, int n, SkCanvas* canvas) {
	this->drawAndCollectOps(n, canvas);

	// now collect json
	GrAuditTrail* at = this->getAuditTrail(canvas);
	Json::Value result = Json::Value(Json::objectValue);
	result[SKDEBUGCANVAS_ATTRIBUTE_VERSION] = Json::Value(SKDEBUGCANVAS_VERSION);
	Json::Value commands = Json::Value(Json::arrayValue);
	for (int i = 0; i < this->getSize() && i <= n; i++) {
	commands[i] = this->getDrawCommandAt(i)->toJSON(urlDataManager);
	if (at) {
	// TODO if this is inefficient we could add a method to GrAuditTrail which takes
	// a Json::Value and is only compiled in this file
	Json::Value parsedFromString;
	Json::Reader reader;
	SkAssertResult(reader.parse(at->toJson(i).c_str(), parsedFromString));

	commands[i][SKDEBUGCANVAS_ATTRIBUTE_AUDITTRAIL] = parsedFromString;
	}
	}
	this->cleanupAuditTrail(canvas);
	result[SKDEBUGCANVAS_ATTRIBUTE_COMMANDS] = commands;
	return result;
	}

	Json::Value SkDebugCanvas::toJSONOpList(int n, SkCanvas* canvas) {
	this->drawAndCollectOps(n, canvas);

	Json::Value parsedFromString;
	GrAuditTrail* at = this->getAuditTrail(canvas);
	if (at) {
	GrAuditTrail::AutoManageOpList enable(at);
	Json::Reader reader;
	SkAssertResult(reader.parse(at->toJson().c_str(), parsedFromString));
	}
	this->cleanupAuditTrail(canvas);
	return parsedFromString;
	}

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

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

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

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

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

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

	void SkDebugCanvas::onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) {
	this->addDrawCommand(new SkDrawAnnotationCommand(rect, key, sk_ref_sp(value)));
	}

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

	void SkDebugCanvas::onDrawBitmapLattice(const SkBitmap& bitmap, const Lattice& lattice,
	const SkRect& dst, const SkPaint* paint) {
	this->addDrawCommand(new SkDrawBitmapLatticeCommand(bitmap, lattice, dst, 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::onDrawImageLattice(const SkImage* image, const Lattice& lattice,
	const SkRect& dst, const SkPaint* paint) {
	this->addDrawCommand(new SkDrawImageLatticeCommand(image, lattice, dst, 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::onDrawImageNine(const SkImage* image, const SkIRect& center,
	const SkRect& dst, const SkPaint* paint) {
	this->addDrawCommand(new SkDrawImageNineCommand(image, center, dst, paint));
	}

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

	void SkDebugCanvas::onDrawArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle,
	bool useCenter, const SkPaint& paint) {
	this->addDrawCommand(new SkDrawArcCommand(oval, startAngle, sweepAngle, useCenter, 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::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
	this->addDrawCommand(new SkDrawRegionCommand(region, paint));
	}

	void SkDebugCanvas::onDrawPicture(const SkPicture* picture,
	const SkMatrix* matrix,
	const SkPaint* paint) {
	this->addDrawCommand(new SkBeginDrawPictureCommand(picture, matrix, paint));
	SkAutoCanvasMatrixPaint acmp(this, matrix, paint, picture->cullRect());
	picture->playback(this);
	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::onDrawTextRSXform(const void* text, size_t byteLength, const SkRSXform xform[],
	const SkRect* cull, const SkPaint& paint) {
	this->addDrawCommand(new SkDrawTextRSXformCommand(text, byteLength, xform, cull, paint));
	}

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

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

	void SkDebugCanvas::onDrawVerticesObject(const SkVertices* vertices, SkBlendMode bmode,
	const SkPaint& paint) {
	this->addDrawCommand(new SkDrawVerticesCommand(sk_ref_sp(const_cast<SkVertices*>(vertices)),
	bmode, paint));
	}

	void SkDebugCanvas::onDrawAtlas(const SkImage* image, const SkRSXform xform[], const SkRect tex[],
	const SkColor colors[], int count, SkBlendMode bmode,
	const SkRect* cull, const SkPaint* paint) {
	this->addDrawCommand(new SkDrawAtlasCommand(image, xform, tex, colors, count, bmode, cull,
	paint));
	}

	void SkDebugCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
	this->addDrawCommand(new SkDrawShadowCommand(path, rec));
	}

	void SkDebugCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
	this->addDrawCommand(new SkDrawDrawableCommand(drawable, matrix));
	}

	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);
	}