tools/json/SkJSONCanvas.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkJSONCanvas.h"
 #include "SkPath.h"
 #include "SkRRect.h"
 #include "stdio.h"
 #include "stdlib.h"

 SkJSONCanvas::SkJSONCanvas(int width, int height, SkWStream& out)
 	: INHERITED(width, height)
 	, fOut(out)
 	, fFirstCommand(true) {
 	fOut.writeText("{\"" SKJSONCANVAS_VERSION "\":1, \"" SKJSONCANVAS_COMMANDS
                    "\":[");
 }

 void SkJSONCanvas::finish() {
 	fOut.writeText("]}");
 }

 void SkJSONCanvas::writef(const char* format, ...) {
     va_list args;
     va_start(args, format);
     SkString s;
     s.appendVAList(format, args);
     fOut.writeText(s.c_str());
 }

 void SkJSONCanvas::open(const char* name) {
 	if (fFirstCommand) {
 		fFirstCommand = false;
 	}
 	else {
 		fOut.writeText(",");
 	}
 	this->writef("{\"" SKJSONCANVAS_COMMAND "\":\"%s\"", name);
 }

 void SkJSONCanvas::close() {
 	fOut.writeText("}");
 }

 void SkJSONCanvas::writeString(const char* name, const char* text) {
     this->writeString(name, text, strlen(text));
 }

 void SkJSONCanvas::writeString(const char* name, const void* text, size_t length) {
 	// TODO: escaping
 	this->writef(",\"%s\":\"", name);
 	fOut.write(text, length);
 	fOut.writeText("\"");
 }

 void SkJSONCanvas::writePoint(const char* name, const SkPoint& point) {
 	this->writef(",\"%s\":[%f, %f]", name, point.x(), point.y());
 }

 void SkJSONCanvas::writeRect(const char* name, const SkRect& rect) {
 	this->writef(",\"%s\":[%f, %f, %f, %f]", name, rect.left(), rect.top(), rect.right(),
 				 rect.bottom());
 }

 void SkJSONCanvas::writeRRect(const char* name, const SkRRect& rrect) {
 	SkRect rect = rrect.rect();
 	SkVector corner1 = rrect.radii(SkRRect::kUpperLeft_Corner);
 	SkVector corner2 = rrect.radii(SkRRect::kUpperRight_Corner);
 	SkVector corner3 = rrect.radii(SkRRect::kLowerLeft_Corner);
 	SkVector corner4 = rrect.radii(SkRRect::kLowerRight_Corner);
 	this->writef(",\"%s\":[[%f, %f, %f, %f],[%f, %f],[%f, %f],[%f, %f],[%f, %f]]", name,
 				 rect.left(), rect.top(), rect.right(), rect.bottom(), corner1.x(), corner1.y(),
 				 corner2.x(), corner2.y(), corner3.x(), corner3.y(), corner4.x(), corner4.y());
 }

 void SkJSONCanvas::writePath(const char* name, const SkPath& path) {
 	SkString text("[");
     SkPath::Iter iter(path, false);
     SkPoint pts[4];
     bool first = true;
     SkPath::Verb verb;
     while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
     	if (first) {
     		first = false;
     	}
     	else {
   			text.append(",");
     	}
         switch (verb) {
             case SkPath::kLine_Verb:
                 text.appendf("{\"" SKJSONCANVAS_VERB_LINE "\":[%f,%f]}", pts[1].x(), pts[1].y());
                 break;
             case SkPath::kQuad_Verb:
                 text.appendf("{\"" SKJSONCANVAS_VERB_QUAD "\":[[%f,%f],[%f,%f]]}", pts[1].x(),
                              pts[1].y(), pts[2].x(), pts[2].y());
                 break;
             case SkPath::kCubic_Verb:
                 text.appendf("{\"" SKJSONCANVAS_VERB_CUBIC "\":[[%f,%f],[%f,%f],[%f,%f]]}",
                              pts[1].x(), pts[1].y(), pts[2].x(), pts[2].y(), pts[3].x(),
                              pts[3].y());
                 break;
             case SkPath::kConic_Verb:
                 text.appendf("{\"" SKJSONCANVAS_VERB_CONIC "\":[[%f,%f],[%f,%f],%f]}", pts[1].x(),
                              pts[1].y(), pts[2].x(), pts[2].y(), iter.conicWeight());
                 break;
             case SkPath::kMove_Verb:
                 text.appendf("{\"" SKJSONCANVAS_VERB_MOVE "\":[%f,%f]}", pts[0].x(), pts[0].y());
                 break;
             case SkPath::kClose_Verb:
                 text.appendf("\"" SKJSONCANVAS_VERB_CLOSE "\"");
                 break;
             case SkPath::kDone_Verb:
                 break;
         }
     }
     text.appendf("]");
 	this->writef(",\"" SKJSONCANVAS_ATTRIBUTE_PATH "\":%s", text.c_str());
 }

 void SkJSONCanvas::writeRegion(const char* name, const SkRegion& region) {
 	this->writef(",\"%s\":\"<unimplemented>\"", name);
 }

 void SkJSONCanvas::writePaint(const SkPaint& paint) {
 	this->writef(",\"" SKJSONCANVAS_ATTRIBUTE_PAINT "\":{");
 	SkColor color = paint.getColor();
 	bool first = true;
 	if (color != SK_ColorBLACK) {
 		this->writef("\"" SKJSONCANVAS_ATTRIBUTE_COLOR "\":[%d,%d,%d,%d]", SkColorGetA(color),
                      SkColorGetR(color), SkColorGetG(color), SkColorGetB(color));
 		first = false;
 	}
     SkPaint::Style style = paint.getStyle();
     if (style != SkPaint::kFill_Style) {
         if (first) {
             first = false;
         }
         else {
             fOut.writeText(",");
         }
         switch (style) {
             case SkPaint::kStroke_Style:
                 fOut.writeText("\"" SKJSONCANVAS_ATTRIBUTE_STYLE "\":\""
                                SKJSONCANVAS_STYLE_STROKE "\"");
                 break;
             case SkPaint::kStrokeAndFill_Style:
                 fOut.writeText("\"" SKJSONCANVAS_ATTRIBUTE_STYLE "\":\""
                                SKJSONCANVAS_STYLE_STROKEANDFILL "\"");
                 break;
             default: SkASSERT(false);
         }
     }
     SkScalar strokeWidth = paint.getStrokeWidth();
     if (strokeWidth != 0.0f) {
         if (first) {
             first = false;
         }
         else {
             fOut.writeText(",");
         }
         this->writef("\"" SKJSONCANVAS_ATTRIBUTE_STROKEWIDTH "\":%f", strokeWidth);
     }
     if (paint.isAntiAlias()) {
         if (first) {
             first = false;
         }
         else {
             fOut.writeText(",");
         }
         fOut.writeText("\"" SKJSONCANVAS_ATTRIBUTE_ANTIALIAS "\":true");
     }
 	fOut.writeText("}");
 }

 void SkJSONCanvas::writeMatrix(const char* name, const SkMatrix& matrix) {
 	this->writef(",\"%s\":[[%f,%f,%f],[%f,%f,%f],[%f,%f,%f]]", name,
 				 matrix[0], matrix[1], matrix[2],
 				 matrix[3], matrix[4], matrix[5],
 				 matrix[6], matrix[7], matrix[8]);
 }

 void SkJSONCanvas::writeRegionOp(const char* name, SkRegion::Op op) {
 	this->writef(",\"%s\":\"", name);
 	switch (op) {
         case SkRegion::kDifference_Op:
             fOut.writeText(SKJSONCANVAS_REGIONOP_DIFFERENCE);
             break;
         case SkRegion::kIntersect_Op:
             fOut.writeText(SKJSONCANVAS_REGIONOP_INTERSECT);
             break;
         case SkRegion::kUnion_Op:
             fOut.writeText(SKJSONCANVAS_REGIONOP_UNION);
             break;
         case SkRegion::kXOR_Op:
             fOut.writeText(SKJSONCANVAS_REGIONOP_XOR);
             break;
         case SkRegion::kReverseDifference_Op:
             fOut.writeText(SKJSONCANVAS_REGIONOP_REVERSE_DIFFERENCE);
             break;
         case SkRegion::kReplace_Op:
             fOut.writeText(SKJSONCANVAS_REGIONOP_REPLACE);
             break;
         default:
             SkASSERT(false);
     };
     fOut.writeText("\"");
 }

 void SkJSONCanvas::writeEdgeStyle(const char* name, SkCanvas::ClipEdgeStyle edgeStyle) {
 	this->writef(",\"%s\":\"", name);
 	switch (edgeStyle) {
         case SkCanvas::kHard_ClipEdgeStyle: fOut.writeText(SKJSONCANVAS_EDGESTYLE_HARD); break;
         case SkCanvas::kSoft_ClipEdgeStyle: fOut.writeText(SKJSONCANVAS_EDGESTYLE_SOFT); break;
         default:                            SkASSERT(false);
     };
     fOut.writeText("\"");
 }

 void SkJSONCanvas::writePointMode(const char* name, SkCanvas::PointMode mode) {
     this->writef(",\"%s\":\"", name);
     switch (mode) {
         case SkCanvas::kPoints_PointMode:  fOut.writeText(SKJSONCANVAS_POINTMODE_POINTS);  break;
         case SkCanvas::kLines_PointMode:   fOut.writeText(SKJSONCANVAS_POINTMODE_LINES);   break;
         case SkCanvas::kPolygon_PointMode: fOut.writeText(SKJSONCANVAS_POINTMODE_POLYGON); break;
         default:                           SkASSERT(false);
     };
     fOut.writeText("\"");
 }

 void SkJSONCanvas::updateMatrix() {
 	const SkMatrix& matrix = this->getTotalMatrix();
 	if (matrix != fLastMatrix) {
 		this->open(SKJSONCANVAS_COMMAND_MATRIX);
 		this->writeMatrix(SKJSONCANVAS_ATTRIBUTE_MATRIX, matrix);
 		fLastMatrix = matrix;
 		this->close();
 	}
 }

 void SkJSONCanvas::onDrawPaint(const SkPaint& paint) {
  	this->open(SKJSONCANVAS_COMMAND_PAINT);
  	this->writePaint(paint);
  	this->close();
 }

 void SkJSONCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
 	this->updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_RECT);
  	this->writeRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rect);
  	this->writePaint(paint);
  	this->close();
 }

 void SkJSONCanvas::onDrawOval(const SkRect& rect, const SkPaint& paint) {
 	this->updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_OVAL);
  	this->writeRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rect);
  	this->writePaint(paint);
  	this->close();
 }

 void SkJSONCanvas::onDrawRRect(const SkRRect& rrect, const SkPaint& paint) {
 	this->updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_RRECT);
  	this->writeRRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rrect);
  	this->writePaint(paint);
  	this->close();}

 void SkJSONCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) {
     this->updateMatrix();
     this->open(SKJSONCANVAS_COMMAND_DRRECT);
     this->writeRRect(SKJSONCANVAS_ATTRIBUTE_OUTER, outer);
     this->writeRRect(SKJSONCANVAS_ATTRIBUTE_INNER, inner);
     this->writePaint(paint);
     this->close();
 }

 void SkJSONCanvas::onDrawPoints(SkCanvas::PointMode mode, size_t count, const SkPoint pts[],
 								const SkPaint& paint) {
     this->updateMatrix();
     this->open(SKJSONCANVAS_COMMAND_POINTS);
     this->writePointMode(SKJSONCANVAS_ATTRIBUTE_MODE, mode);
     fOut.writeText(",\"" SKJSONCANVAS_ATTRIBUTE_POINTS "\":[");
     for (size_t i = 0; i < count; i++) {
         if (i != 0) {
             fOut.writeText(",");
         }
         this->writef("[%f,%f]", pts[i].x(), pts[i].y());
     }
     fOut.writeText("]");
     this->writePaint(paint);
     this->close();
 }

 void SkJSONCanvas::onDrawVertices(SkCanvas::VertexMode, int vertexCount, const SkPoint vertices[],
                                   const SkPoint texs[], const SkColor colors[], SkXfermode*,
                                   const uint16_t indices[], int indexCount, const SkPaint&) {
     SkDebugf("unsupported: drawVertices\n");
 }

 void SkJSONCanvas::onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[],
                                int count, SkXfermode::Mode, const SkRect* cull, const SkPaint*) {
     SkDebugf("unsupported: drawAtlas\n");
 }

 void SkJSONCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
 	this->updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_PATH);
  	this->writePath(SKJSONCANVAS_ATTRIBUTE_PATH, path);
  	this->writePaint(paint);
  	this->close();}

 void SkJSONCanvas::onDrawImage(const SkImage*, SkScalar dx, SkScalar dy, const SkPaint*) {
     SkDebugf("unsupported: drawImage\n");
 }

 void SkJSONCanvas::onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*,
                                    SkCanvas::SrcRectConstraint) {
     SkDebugf("unsupported: drawImageRect\n");
 }

 void SkJSONCanvas::onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst,
                                    const SkPaint*) {
     SkDebugf("unsupported: drawImageNine\n");
 }

 void SkJSONCanvas::onDrawBitmap(const SkBitmap&, SkScalar dx, SkScalar dy, const SkPaint*) {
     SkDebugf("unsupported: drawBitmap\n");
 }

 void SkJSONCanvas::onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect&, const SkPaint*,
                                     SkCanvas::SrcRectConstraint) {
     SkDebugf("unsupported: drawBitmapRect\n");
 }

 void SkJSONCanvas::onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst,
                                     const SkPaint*) {
     SkDebugf("unsupported: drawBitmapNine\n");
 }

 void SkJSONCanvas::onDrawText(const void* text, size_t byteLength, SkScalar x,
                               SkScalar y, const SkPaint& paint) {
     this->updateMatrix();
     this->open(SKJSONCANVAS_COMMAND_TEXT);
     this->writeString(SKJSONCANVAS_ATTRIBUTE_TEXT, text, byteLength);
     this->writePoint(SKJSONCANVAS_ATTRIBUTE_COORDS, { x, y });
     this->writePaint(paint);
     this->close();
 }

 void SkJSONCanvas::onDrawPosText(const void* text, size_t byteLength,
                                  const SkPoint pos[], const SkPaint& paint) {
     SkDebugf("unsupported: drawPosText\n");
 }

 void SkJSONCanvas::onDrawPosTextH(const void* text, size_t byteLength,
                                   const SkScalar xpos[], SkScalar constY,
                                   const SkPaint& paint) {
     SkDebugf("unsupported: drawPosTextH\n");
 }

 void SkJSONCanvas::onDrawTextOnPath(const void* text, size_t byteLength,
                                     const SkPath& path, const SkMatrix* matrix,
                                     const SkPaint& paint) {
     SkDebugf("unsupported: drawTextOnPath\n");
 }

 void SkJSONCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                                   const SkPaint& paint) {
     SkDebugf("unsupported: drawTextBlob\n");
 }

 void SkJSONCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                                const SkPoint texCoords[4], SkXfermode* xmode,
                                const SkPaint& paint) {
     SkDebugf("unsupported: drawPatch\n");
 }

 void SkJSONCanvas::onDrawDrawable(SkDrawable*, const SkMatrix*) {
     SkDebugf("unsupported: drawDrawable\n");
 }

 void SkJSONCanvas::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 	this->updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_CLIPRECT);
  	this->writeRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rect);
  	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
  	this->writeEdgeStyle(SKJSONCANVAS_ATTRIBUTE_EDGESTYLE, edgeStyle);
  	this->close();
 }

 void SkJSONCanvas::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 	this->updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_CLIPRRECT);
  	this->writeRRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rrect);
  	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
  	this->writeEdgeStyle(SKJSONCANVAS_ATTRIBUTE_EDGESTYLE, edgeStyle);
  	this->close();
 }

 void SkJSONCanvas::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
 	updateMatrix();
  	this->open(SKJSONCANVAS_COMMAND_CLIPPATH);
  	this->writePath(SKJSONCANVAS_ATTRIBUTE_PATH, path);
  	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
  	this->writeEdgeStyle(SKJSONCANVAS_ATTRIBUTE_EDGESTYLE, edgeStyle);
  	this->close();
 }

 void SkJSONCanvas::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
  	this->open(SKJSONCANVAS_COMMAND_CLIPREGION);
  	this->writeRegion(SKJSONCANVAS_ATTRIBUTE_DEVICEREGION, deviceRgn);
  	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
  	this->close();
 }

 void SkJSONCanvas::willSave() {
 	this->open(SKJSONCANVAS_COMMAND_SAVE);
 	this->close();
 }

 void SkJSONCanvas::willRestore() {
 	this->open(SKJSONCANVAS_COMMAND_RESTORE);
 	this->close();
 }
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkJSONCanvas.h"
	#include "SkPath.h"
	#include "SkRRect.h"
	#include "stdio.h"
	#include "stdlib.h"

	SkJSONCanvas::SkJSONCanvas(int width, int height, SkWStream& out)
	: INHERITED(width, height)
	, fOut(out)
	, fFirstCommand(true) {
	fOut.writeText("{\"" SKJSONCANVAS_VERSION "\":1, \"" SKJSONCANVAS_COMMANDS
	"\":[");
	}

	void SkJSONCanvas::finish() {
	fOut.writeText("]}");
	}

	void SkJSONCanvas::writef(const char* format, ...) {
	va_list args;
	va_start(args, format);
	SkString s;
	s.appendVAList(format, args);
	fOut.writeText(s.c_str());
	}

	void SkJSONCanvas::open(const char* name) {
	if (fFirstCommand) {
	fFirstCommand = false;
	}
	else {
	fOut.writeText(",");
	}
	this->writef("{\"" SKJSONCANVAS_COMMAND "\":\"%s\"", name);
	}

	void SkJSONCanvas::close() {
	fOut.writeText("}");
	}

	void SkJSONCanvas::writeString(const char* name, const char* text) {
	this->writeString(name, text, strlen(text));
	}

	void SkJSONCanvas::writeString(const char* name, const void* text, size_t length) {
	// TODO: escaping
	this->writef(",\"%s\":\"", name);
	fOut.write(text, length);
	fOut.writeText("\"");
	}

	void SkJSONCanvas::writePoint(const char* name, const SkPoint& point) {
	this->writef(",\"%s\":[%f, %f]", name, point.x(), point.y());
	}

	void SkJSONCanvas::writeRect(const char* name, const SkRect& rect) {
	this->writef(",\"%s\":[%f, %f, %f, %f]", name, rect.left(), rect.top(), rect.right(),
	rect.bottom());
	}

	void SkJSONCanvas::writeRRect(const char* name, const SkRRect& rrect) {
	SkRect rect = rrect.rect();
	SkVector corner1 = rrect.radii(SkRRect::kUpperLeft_Corner);
	SkVector corner2 = rrect.radii(SkRRect::kUpperRight_Corner);
	SkVector corner3 = rrect.radii(SkRRect::kLowerLeft_Corner);
	SkVector corner4 = rrect.radii(SkRRect::kLowerRight_Corner);
	this->writef(",\"%s\":[[%f, %f, %f, %f],[%f, %f],[%f, %f],[%f, %f],[%f, %f]]", name,
	rect.left(), rect.top(), rect.right(), rect.bottom(), corner1.x(), corner1.y(),
	corner2.x(), corner2.y(), corner3.x(), corner3.y(), corner4.x(), corner4.y());
	}

	void SkJSONCanvas::writePath(const char* name, const SkPath& path) {
	SkString text("[");
	SkPath::Iter iter(path, false);
	SkPoint pts[4];
	bool first = true;
	SkPath::Verb verb;
	while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
	if (first) {
	first = false;
	}
	else {
	text.append(",");
	}
	switch (verb) {
	case SkPath::kLine_Verb:
	text.appendf("{\"" SKJSONCANVAS_VERB_LINE "\":[%f,%f]}", pts[1].x(), pts[1].y());
	break;
	case SkPath::kQuad_Verb:
	text.appendf("{\"" SKJSONCANVAS_VERB_QUAD "\":[[%f,%f],[%f,%f]]}", pts[1].x(),
	pts[1].y(), pts[2].x(), pts[2].y());
	break;
	case SkPath::kCubic_Verb:
	text.appendf("{\"" SKJSONCANVAS_VERB_CUBIC "\":[[%f,%f],[%f,%f],[%f,%f]]}",
	pts[1].x(), pts[1].y(), pts[2].x(), pts[2].y(), pts[3].x(),
	pts[3].y());
	break;
	case SkPath::kConic_Verb:
	text.appendf("{\"" SKJSONCANVAS_VERB_CONIC "\":[[%f,%f],[%f,%f],%f]}", pts[1].x(),
	pts[1].y(), pts[2].x(), pts[2].y(), iter.conicWeight());
	break;
	case SkPath::kMove_Verb:
	text.appendf("{\"" SKJSONCANVAS_VERB_MOVE "\":[%f,%f]}", pts[0].x(), pts[0].y());
	break;
	case SkPath::kClose_Verb:
	text.appendf("\"" SKJSONCANVAS_VERB_CLOSE "\"");
	break;
	case SkPath::kDone_Verb:
	break;
	}
	}
	text.appendf("]");
	this->writef(",\"" SKJSONCANVAS_ATTRIBUTE_PATH "\":%s", text.c_str());
	}

	void SkJSONCanvas::writeRegion(const char* name, const SkRegion& region) {
	this->writef(",\"%s\":\"<unimplemented>\"", name);
	}

	void SkJSONCanvas::writePaint(const SkPaint& paint) {
	this->writef(",\"" SKJSONCANVAS_ATTRIBUTE_PAINT "\":{");
	SkColor color = paint.getColor();
	bool first = true;
	if (color != SK_ColorBLACK) {
	this->writef("\"" SKJSONCANVAS_ATTRIBUTE_COLOR "\":[%d,%d,%d,%d]", SkColorGetA(color),
	SkColorGetR(color), SkColorGetG(color), SkColorGetB(color));
	first = false;
	}
	SkPaint::Style style = paint.getStyle();
	if (style != SkPaint::kFill_Style) {
	if (first) {
	first = false;
	}
	else {
	fOut.writeText(",");
	}
	switch (style) {
	case SkPaint::kStroke_Style:
	fOut.writeText("\"" SKJSONCANVAS_ATTRIBUTE_STYLE "\":\""
	SKJSONCANVAS_STYLE_STROKE "\"");
	break;
	case SkPaint::kStrokeAndFill_Style:
	fOut.writeText("\"" SKJSONCANVAS_ATTRIBUTE_STYLE "\":\""
	SKJSONCANVAS_STYLE_STROKEANDFILL "\"");
	break;
	default: SkASSERT(false);
	}
	}
	SkScalar strokeWidth = paint.getStrokeWidth();
	if (strokeWidth != 0.0f) {
	if (first) {
	first = false;
	}
	else {
	fOut.writeText(",");
	}
	this->writef("\"" SKJSONCANVAS_ATTRIBUTE_STROKEWIDTH "\":%f", strokeWidth);
	}
	if (paint.isAntiAlias()) {
	if (first) {
	first = false;
	}
	else {
	fOut.writeText(",");
	}
	fOut.writeText("\"" SKJSONCANVAS_ATTRIBUTE_ANTIALIAS "\":true");
	}
	fOut.writeText("}");
	}

	void SkJSONCanvas::writeMatrix(const char* name, const SkMatrix& matrix) {
	this->writef(",\"%s\":[[%f,%f,%f],[%f,%f,%f],[%f,%f,%f]]", name,
	matrix[0], matrix[1], matrix[2],
	matrix[3], matrix[4], matrix[5],
	matrix[6], matrix[7], matrix[8]);
	}

	void SkJSONCanvas::writeRegionOp(const char* name, SkRegion::Op op) {
	this->writef(",\"%s\":\"", name);
	switch (op) {
	case SkRegion::kDifference_Op:
	fOut.writeText(SKJSONCANVAS_REGIONOP_DIFFERENCE);
	break;
	case SkRegion::kIntersect_Op:
	fOut.writeText(SKJSONCANVAS_REGIONOP_INTERSECT);
	break;
	case SkRegion::kUnion_Op:
	fOut.writeText(SKJSONCANVAS_REGIONOP_UNION);
	break;
	case SkRegion::kXOR_Op:
	fOut.writeText(SKJSONCANVAS_REGIONOP_XOR);
	break;
	case SkRegion::kReverseDifference_Op:
	fOut.writeText(SKJSONCANVAS_REGIONOP_REVERSE_DIFFERENCE);
	break;
	case SkRegion::kReplace_Op:
	fOut.writeText(SKJSONCANVAS_REGIONOP_REPLACE);
	break;
	default:
	SkASSERT(false);
	};
	fOut.writeText("\"");
	}

	void SkJSONCanvas::writeEdgeStyle(const char* name, SkCanvas::ClipEdgeStyle edgeStyle) {
	this->writef(",\"%s\":\"", name);
	switch (edgeStyle) {
	case SkCanvas::kHard_ClipEdgeStyle: fOut.writeText(SKJSONCANVAS_EDGESTYLE_HARD); break;
	case SkCanvas::kSoft_ClipEdgeStyle: fOut.writeText(SKJSONCANVAS_EDGESTYLE_SOFT); break;
	default: SkASSERT(false);
	};
	fOut.writeText("\"");
	}

	void SkJSONCanvas::writePointMode(const char* name, SkCanvas::PointMode mode) {
	this->writef(",\"%s\":\"", name);
	switch (mode) {
	case SkCanvas::kPoints_PointMode: fOut.writeText(SKJSONCANVAS_POINTMODE_POINTS); break;
	case SkCanvas::kLines_PointMode: fOut.writeText(SKJSONCANVAS_POINTMODE_LINES); break;
	case SkCanvas::kPolygon_PointMode: fOut.writeText(SKJSONCANVAS_POINTMODE_POLYGON); break;
	default: SkASSERT(false);
	};
	fOut.writeText("\"");
	}

	void SkJSONCanvas::updateMatrix() {
	const SkMatrix& matrix = this->getTotalMatrix();
	if (matrix != fLastMatrix) {
	this->open(SKJSONCANVAS_COMMAND_MATRIX);
	this->writeMatrix(SKJSONCANVAS_ATTRIBUTE_MATRIX, matrix);
	fLastMatrix = matrix;
	this->close();
	}
	}

	void SkJSONCanvas::onDrawPaint(const SkPaint& paint) {
	this->open(SKJSONCANVAS_COMMAND_PAINT);
	this->writePaint(paint);
	this->close();
	}

	void SkJSONCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_RECT);
	this->writeRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rect);
	this->writePaint(paint);
	this->close();
	}

	void SkJSONCanvas::onDrawOval(const SkRect& rect, const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_OVAL);
	this->writeRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rect);
	this->writePaint(paint);
	this->close();
	}

	void SkJSONCanvas::onDrawRRect(const SkRRect& rrect, const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_RRECT);
	this->writeRRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rrect);
	this->writePaint(paint);
	this->close();}

	void SkJSONCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_DRRECT);
	this->writeRRect(SKJSONCANVAS_ATTRIBUTE_OUTER, outer);
	this->writeRRect(SKJSONCANVAS_ATTRIBUTE_INNER, inner);
	this->writePaint(paint);
	this->close();
	}

	void SkJSONCanvas::onDrawPoints(SkCanvas::PointMode mode, size_t count, const SkPoint pts[],
	const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_POINTS);
	this->writePointMode(SKJSONCANVAS_ATTRIBUTE_MODE, mode);
	fOut.writeText(",\"" SKJSONCANVAS_ATTRIBUTE_POINTS "\":[");
	for (size_t i = 0; i < count; i++) {
	if (i != 0) {
	fOut.writeText(",");
	}
	this->writef("[%f,%f]", pts[i].x(), pts[i].y());
	}
	fOut.writeText("]");
	this->writePaint(paint);
	this->close();
	}

	void SkJSONCanvas::onDrawVertices(SkCanvas::VertexMode, int vertexCount, const SkPoint vertices[],
	const SkPoint texs[], const SkColor colors[], SkXfermode*,
	const uint16_t indices[], int indexCount, const SkPaint&) {
	SkDebugf("unsupported: drawVertices\n");
	}

	void SkJSONCanvas::onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[],
	int count, SkXfermode::Mode, const SkRect* cull, const SkPaint*) {
	SkDebugf("unsupported: drawAtlas\n");
	}

	void SkJSONCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_PATH);
	this->writePath(SKJSONCANVAS_ATTRIBUTE_PATH, path);
	this->writePaint(paint);
	this->close();}

	void SkJSONCanvas::onDrawImage(const SkImage, SkScalar dx, SkScalar dy, const SkPaint) {
	SkDebugf("unsupported: drawImage\n");
	}

	void SkJSONCanvas::onDrawImageRect(const SkImage, const SkRect, const SkRect&, const SkPaint*,
	SkCanvas::SrcRectConstraint) {
	SkDebugf("unsupported: drawImageRect\n");
	}

	void SkJSONCanvas::onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst,
	const SkPaint*) {
	SkDebugf("unsupported: drawImageNine\n");
	}

	void SkJSONCanvas::onDrawBitmap(const SkBitmap&, SkScalar dx, SkScalar dy, const SkPaint*) {
	SkDebugf("unsupported: drawBitmap\n");
	}

	void SkJSONCanvas::onDrawBitmapRect(const SkBitmap&, const SkRect, const SkRect&, const SkPaint,
	SkCanvas::SrcRectConstraint) {
	SkDebugf("unsupported: drawBitmapRect\n");
	}

	void SkJSONCanvas::onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst,
	const SkPaint*) {
	SkDebugf("unsupported: drawBitmapNine\n");
	}

	void SkJSONCanvas::onDrawText(const void* text, size_t byteLength, SkScalar x,
	SkScalar y, const SkPaint& paint) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_TEXT);
	this->writeString(SKJSONCANVAS_ATTRIBUTE_TEXT, text, byteLength);
	this->writePoint(SKJSONCANVAS_ATTRIBUTE_COORDS, { x, y });
	this->writePaint(paint);
	this->close();
	}

	void SkJSONCanvas::onDrawPosText(const void* text, size_t byteLength,
	const SkPoint pos[], const SkPaint& paint) {
	SkDebugf("unsupported: drawPosText\n");
	}

	void SkJSONCanvas::onDrawPosTextH(const void* text, size_t byteLength,
	const SkScalar xpos[], SkScalar constY,
	const SkPaint& paint) {
	SkDebugf("unsupported: drawPosTextH\n");
	}

	void SkJSONCanvas::onDrawTextOnPath(const void* text, size_t byteLength,
	const SkPath& path, const SkMatrix* matrix,
	const SkPaint& paint) {
	SkDebugf("unsupported: drawTextOnPath\n");
	}

	void SkJSONCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
	const SkPaint& paint) {
	SkDebugf("unsupported: drawTextBlob\n");
	}

	void SkJSONCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
	const SkPoint texCoords[4], SkXfermode* xmode,
	const SkPaint& paint) {
	SkDebugf("unsupported: drawPatch\n");
	}

	void SkJSONCanvas::onDrawDrawable(SkDrawable, const SkMatrix) {
	SkDebugf("unsupported: drawDrawable\n");
	}

	void SkJSONCanvas::onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_CLIPRECT);
	this->writeRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rect);
	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
	this->writeEdgeStyle(SKJSONCANVAS_ATTRIBUTE_EDGESTYLE, edgeStyle);
	this->close();
	}

	void SkJSONCanvas::onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	this->updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_CLIPRRECT);
	this->writeRRect(SKJSONCANVAS_ATTRIBUTE_COORDS, rrect);
	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
	this->writeEdgeStyle(SKJSONCANVAS_ATTRIBUTE_EDGESTYLE, edgeStyle);
	this->close();
	}

	void SkJSONCanvas::onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle) {
	updateMatrix();
	this->open(SKJSONCANVAS_COMMAND_CLIPPATH);
	this->writePath(SKJSONCANVAS_ATTRIBUTE_PATH, path);
	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
	this->writeEdgeStyle(SKJSONCANVAS_ATTRIBUTE_EDGESTYLE, edgeStyle);
	this->close();
	}

	void SkJSONCanvas::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
	this->open(SKJSONCANVAS_COMMAND_CLIPREGION);
	this->writeRegion(SKJSONCANVAS_ATTRIBUTE_DEVICEREGION, deviceRgn);
	this->writeRegionOp(SKJSONCANVAS_ATTRIBUTE_REGIONOP, op);
	this->close();
	}

	void SkJSONCanvas::willSave() {
	this->open(SKJSONCANVAS_COMMAND_SAVE);
	this->close();
	}

	void SkJSONCanvas::willRestore() {
	this->open(SKJSONCANVAS_COMMAND_RESTORE);
	this->close();
	}