src/pdf/SkPDFUtils.cpp - skia - Git at Google

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "SkPDFUtils.h"

 #include "SkData.h"
 #include "SkFixed.h"
 #include "SkGeometry.h"
 #include "SkImage_Base.h"
 #include "SkPDFResourceDict.h"
 #include "SkPDFTypes.h"
 #include "SkStream.h"
 #include "SkString.h"

 #include <cmath>

 sk_sp<SkPDFArray> SkPDFUtils::RectToArray(const SkRect& rect) {
     auto result = sk_make_sp<SkPDFArray>();
     result->reserve(4);
     result->appendScalar(rect.fLeft);
     result->appendScalar(rect.fTop);
     result->appendScalar(rect.fRight);
     result->appendScalar(rect.fBottom);
     return result;
 }

 sk_sp<SkPDFArray> SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
     SkScalar values[6];
     if (!matrix.asAffine(values)) {
         SkMatrix::SetAffineIdentity(values);
     }

     auto result = sk_make_sp<SkPDFArray>();
     result->reserve(6);
     for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
         result->appendScalar(values[i]);
     }
     return result;
 }

 // static
 void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
     SkScalar values[6];
     if (!matrix.asAffine(values)) {
         SkMatrix::SetAffineIdentity(values);
     }
     for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
         SkPDFUtils::AppendScalar(values[i], content);
         content->writeText(" ");
     }
     content->writeText("cm\n");
 }

 // static
 void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
     SkPDFUtils::AppendScalar(x, content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(y, content);
     content->writeText(" m\n");
 }

 // static
 void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
     SkPDFUtils::AppendScalar(x, content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(y, content);
     content->writeText(" l\n");
 }

 // static
 void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
                              SkScalar ctl2X, SkScalar ctl2Y,
                              SkScalar dstX, SkScalar dstY, SkWStream* content) {
     SkString cmd("y\n");
     SkPDFUtils::AppendScalar(ctl1X, content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(ctl1Y, content);
     content->writeText(" ");
     if (ctl2X != dstX || ctl2Y != dstY) {
         cmd.set("c\n");
         SkPDFUtils::AppendScalar(ctl2X, content);
         content->writeText(" ");
         SkPDFUtils::AppendScalar(ctl2Y, content);
         content->writeText(" ");
     }
     SkPDFUtils::AppendScalar(dstX, content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(dstY, content);
     content->writeText(" ");
     content->writeText(cmd.c_str());
 }

 static void append_quad(const SkPoint quad[], SkWStream* content) {
     SkPoint cubic[4];
     SkConvertQuadToCubic(quad, cubic);
     SkPDFUtils::AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
                             cubic[3].fX, cubic[3].fY, content);
 }

 // static
 void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
     // Skia has 0,0 at top left, pdf at bottom left.  Do the right thing.
     SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);

     SkPDFUtils::AppendScalar(rect.fLeft, content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(bottom, content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(rect.width(), content);
     content->writeText(" ");
     SkPDFUtils::AppendScalar(rect.height(), content);
     content->writeText(" re\n");
 }

 // static
 void SkPDFUtils::EmitPath(const SkPath& path, SkPaint::Style paintStyle,
                           bool doConsumeDegerates, SkWStream* content,
                           SkScalar tolerance) {
     if (path.isEmpty() && SkPaint::kFill_Style == paintStyle) {
         SkPDFUtils::AppendRectangle({0, 0, 0, 0}, content);
         return;
     }
     // Filling a path with no area results in a drawing in PDF renderers but
     // Chrome expects to be able to draw some such entities with no visible
     // result, so we detect those cases and discard the drawing for them.
     // Specifically: moveTo(X), lineTo(Y) and moveTo(X), lineTo(X), lineTo(Y).

     SkRect rect;
     bool isClosed; // Both closure and direction need to be checked.
     SkPath::Direction direction;
     if (path.isRect(&rect, &isClosed, &direction) &&
         isClosed &&
         (SkPath::kCW_Direction == direction ||
          SkPath::kEvenOdd_FillType == path.getFillType()))
     {
         SkPDFUtils::AppendRectangle(rect, content);
         return;
     }

     enum SkipFillState {
         kEmpty_SkipFillState,
         kSingleLine_SkipFillState,
         kNonSingleLine_SkipFillState,
     };
     SkipFillState fillState = kEmpty_SkipFillState;
     //if (paintStyle != SkPaint::kFill_Style) {
     //    fillState = kNonSingleLine_SkipFillState;
     //}
     SkPoint lastMovePt = SkPoint::Make(0,0);
     SkDynamicMemoryWStream currentSegment;
     SkPoint args[4];
     SkPath::Iter iter(path, false);
     for (SkPath::Verb verb = iter.next(args, doConsumeDegerates);
          verb != SkPath::kDone_Verb;
          verb = iter.next(args, doConsumeDegerates)) {
         // args gets all the points, even the implicit first point.
         switch (verb) {
             case SkPath::kMove_Verb:
                 MoveTo(args[0].fX, args[0].fY, &currentSegment);
                 lastMovePt = args[0];
                 fillState = kEmpty_SkipFillState;
                 break;
             case SkPath::kLine_Verb:
                 AppendLine(args[1].fX, args[1].fY, &currentSegment);
                 if ((fillState == kEmpty_SkipFillState) && (args[0] != lastMovePt)) {
                     fillState = kSingleLine_SkipFillState;
                     break;
                 }
                 fillState = kNonSingleLine_SkipFillState;
                 break;
             case SkPath::kQuad_Verb:
                 append_quad(args, &currentSegment);
                 fillState = kNonSingleLine_SkipFillState;
                 break;
             case SkPath::kConic_Verb: {
                 SkAutoConicToQuads converter;
                 const SkPoint* quads = converter.computeQuads(args, iter.conicWeight(), tolerance);
                 for (int i = 0; i < converter.countQuads(); ++i) {
                     append_quad(&quads[i * 2], &currentSegment);
                 }
                 fillState = kNonSingleLine_SkipFillState;
             } break;
             case SkPath::kCubic_Verb:
                 AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
                             args[3].fX, args[3].fY, &currentSegment);
                 fillState = kNonSingleLine_SkipFillState;
                 break;
             case SkPath::kClose_Verb:
                 ClosePath(&currentSegment);
                 currentSegment.writeToStream(content);
                 currentSegment.reset();
                 break;
             default:
                 SkASSERT(false);
                 break;
         }
     }
     if (currentSegment.bytesWritten() > 0) {
         currentSegment.writeToStream(content);
     }
 }

 // static
 void SkPDFUtils::ClosePath(SkWStream* content) {
     content->writeText("h\n");
 }

 // static
 void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
                            SkWStream* content) {
     if (style == SkPaint::kFill_Style) {
         content->writeText("f");
     } else if (style == SkPaint::kStrokeAndFill_Style) {
         content->writeText("B");
     } else if (style == SkPaint::kStroke_Style) {
         content->writeText("S");
     }

     if (style != SkPaint::kStroke_Style) {
         NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
         NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
         if (fill == SkPath::kEvenOdd_FillType) {
             content->writeText("*");
         }
     }
     content->writeText("\n");
 }

 // static
 void SkPDFUtils::StrokePath(SkWStream* content) {
     SkPDFUtils::PaintPath(
         SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
 }

 // static
 void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
     content->writeText("/");
     content->writeText(SkPDFResourceDict::getResourceName(
             SkPDFResourceDict::kXObject_ResourceType,
             objectIndex).c_str());
     content->writeText(" Do\n");
 }

 // static
 void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
     content->writeText("/");
     content->writeText(SkPDFResourceDict::getResourceName(
             SkPDFResourceDict::kExtGState_ResourceType,
             objectIndex).c_str());
     content->writeText(" gs\n");
 }

 // static
 void SkPDFUtils::ApplyPattern(int objectIndex, SkWStream* content) {
     // Select Pattern color space (CS, cs) and set pattern object as current
     // color (SCN, scn)
     SkString resourceName = SkPDFResourceDict::getResourceName(
             SkPDFResourceDict::kPattern_ResourceType,
             objectIndex);
     content->writeText("/Pattern CS/Pattern cs/");
     content->writeText(resourceName.c_str());
     content->writeText(" SCN/");
     content->writeText(resourceName.c_str());
     content->writeText(" scn\n");
 }

 size_t SkPDFUtils::ColorToDecimal(uint8_t value, char result[5]) {
     if (value == 255 || value == 0) {
         result[0] = value ? '1' : '0';
         result[1] = '\0';
         return 1;
     }
     // int x = 0.5 + (1000.0 / 255.0) * value;
     int x = SkFixedRoundToInt((SK_Fixed1 * 1000 / 255) * value);
     result[0] = '.';
     for (int i = 3; i > 0; --i) {
         result[i] = '0' + x % 10;
         x /= 10;
     }
     int j;
     for (j = 3; j > 1; --j) {
         if (result[j] != '0') {
             break;
         }
     }
     result[j + 1] = '\0';
     return j + 1;
 }

 void SkPDFUtils::WriteString(SkWStream* wStream, const char* cin, size_t len) {
     SkDEBUGCODE(static const size_t kMaxLen = 65535;)
     SkASSERT(len <= kMaxLen);

     size_t extraCharacterCount = 0;
     for (size_t i = 0; i < len; i++) {
         if (cin[i] > '~' || cin[i] < ' ') {
             extraCharacterCount += 3;
         }
         if (cin[i] == '\\' || cin[i] == '(' || cin[i] == ')') {
             ++extraCharacterCount;
         }
     }
     if (extraCharacterCount <= len) {
         wStream->writeText("(");
         for (size_t i = 0; i < len; i++) {
             if (cin[i] > '~' || cin[i] < ' ') {
                 uint8_t c = static_cast<uint8_t>(cin[i]);
                 uint8_t octal[4];
                 octal[0] = '\\';
                 octal[1] = '0' + ( c >> 6        );
                 octal[2] = '0' + ((c >> 3) & 0x07);
                 octal[3] = '0' + ( c       & 0x07);
                 wStream->write(octal, 4);
             } else {
                 if (cin[i] == '\\' || cin[i] == '(' || cin[i] == ')') {
                     wStream->writeText("\\");
                 }
                 wStream->write(&cin[i], 1);
             }
         }
         wStream->writeText(")");
     } else {
         wStream->writeText("<");
         for (size_t i = 0; i < len; i++) {
             uint8_t c = static_cast<uint8_t>(cin[i]);
             char hexValue[2] = { SkHexadecimalDigits::gUpper[c >> 4],
                                  SkHexadecimalDigits::gUpper[c & 0xF] };
             wStream->write(hexValue, 2);
         }
         wStream->writeText(">");
     }
 }

 bool SkPDFUtils::InverseTransformBBox(const SkMatrix& matrix, SkRect* bbox) {
     SkMatrix inverse;
     if (!matrix.invert(&inverse)) {
         return false;
     }
     inverse.mapRect(bbox);
     return true;
 }

 void SkPDFUtils::PopulateTilingPatternDict(SkPDFDict* pattern,
                                            SkRect& bbox,
                                            sk_sp<SkPDFDict> resources,
                                            const SkMatrix& matrix) {
     const int kTiling_PatternType = 1;
     const int kColoredTilingPattern_PaintType = 1;
     const int kConstantSpacing_TilingType = 1;

     pattern->insertName("Type", "Pattern");
     pattern->insertInt("PatternType", kTiling_PatternType);
     pattern->insertInt("PaintType", kColoredTilingPattern_PaintType);
     pattern->insertInt("TilingType", kConstantSpacing_TilingType);
     pattern->insertObject("BBox", SkPDFUtils::RectToArray(bbox));
     pattern->insertScalar("XStep", bbox.width());
     pattern->insertScalar("YStep", bbox.height());
     pattern->insertObject("Resources", std::move(resources));
     if (!matrix.isIdentity()) {
         pattern->insertObject("Matrix", SkPDFUtils::MatrixToArray(matrix));
     }
 }

 bool SkPDFUtils::ToBitmap(const SkImage* img, SkBitmap* dst) {
     SkASSERT(img);
     SkASSERT(dst);
     SkBitmap bitmap;
     if(as_IB(img)->getROPixels(&bitmap, nullptr)) {
         SkASSERT(bitmap.dimensions() == img->dimensions());
         SkASSERT(!bitmap.drawsNothing());
         *dst = std::move(bitmap);
         return true;
     }
     return false;
 }
	/*
	* Copyright 2011 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "SkPDFUtils.h"

	#include "SkData.h"
	#include "SkFixed.h"
	#include "SkGeometry.h"
	#include "SkImage_Base.h"
	#include "SkPDFResourceDict.h"
	#include "SkPDFTypes.h"
	#include "SkStream.h"
	#include "SkString.h"

	#include <cmath>

	sk_sp<SkPDFArray> SkPDFUtils::RectToArray(const SkRect& rect) {
	auto result = sk_make_sp<SkPDFArray>();
	result->reserve(4);
	result->appendScalar(rect.fLeft);
	result->appendScalar(rect.fTop);
	result->appendScalar(rect.fRight);
	result->appendScalar(rect.fBottom);
	return result;
	}

	sk_sp<SkPDFArray> SkPDFUtils::MatrixToArray(const SkMatrix& matrix) {
	SkScalar values[6];
	if (!matrix.asAffine(values)) {
	SkMatrix::SetAffineIdentity(values);
	}

	auto result = sk_make_sp<SkPDFArray>();
	result->reserve(6);
	for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
	result->appendScalar(values[i]);
	}
	return result;
	}

	// static
	void SkPDFUtils::AppendTransform(const SkMatrix& matrix, SkWStream* content) {
	SkScalar values[6];
	if (!matrix.asAffine(values)) {
	SkMatrix::SetAffineIdentity(values);
	}
	for (size_t i = 0; i < SK_ARRAY_COUNT(values); i++) {
	SkPDFUtils::AppendScalar(values[i], content);
	content->writeText(" ");
	}
	content->writeText("cm\n");
	}

	// static
	void SkPDFUtils::MoveTo(SkScalar x, SkScalar y, SkWStream* content) {
	SkPDFUtils::AppendScalar(x, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(y, content);
	content->writeText(" m\n");
	}

	// static
	void SkPDFUtils::AppendLine(SkScalar x, SkScalar y, SkWStream* content) {
	SkPDFUtils::AppendScalar(x, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(y, content);
	content->writeText(" l\n");
	}

	// static
	void SkPDFUtils::AppendCubic(SkScalar ctl1X, SkScalar ctl1Y,
	SkScalar ctl2X, SkScalar ctl2Y,
	SkScalar dstX, SkScalar dstY, SkWStream* content) {
	SkString cmd("y\n");
	SkPDFUtils::AppendScalar(ctl1X, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(ctl1Y, content);
	content->writeText(" ");
	if (ctl2X != dstX \|\| ctl2Y != dstY) {
	cmd.set("c\n");
	SkPDFUtils::AppendScalar(ctl2X, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(ctl2Y, content);
	content->writeText(" ");
	}
	SkPDFUtils::AppendScalar(dstX, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(dstY, content);
	content->writeText(" ");
	content->writeText(cmd.c_str());
	}

	static void append_quad(const SkPoint quad[], SkWStream* content) {
	SkPoint cubic[4];
	SkConvertQuadToCubic(quad, cubic);
	SkPDFUtils::AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
	cubic[3].fX, cubic[3].fY, content);
	}

	// static
	void SkPDFUtils::AppendRectangle(const SkRect& rect, SkWStream* content) {
	// Skia has 0,0 at top left, pdf at bottom left. Do the right thing.
	SkScalar bottom = SkMinScalar(rect.fBottom, rect.fTop);

	SkPDFUtils::AppendScalar(rect.fLeft, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(bottom, content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(rect.width(), content);
	content->writeText(" ");
	SkPDFUtils::AppendScalar(rect.height(), content);
	content->writeText(" re\n");
	}

	// static
	void SkPDFUtils::EmitPath(const SkPath& path, SkPaint::Style paintStyle,
	bool doConsumeDegerates, SkWStream* content,
	SkScalar tolerance) {
	if (path.isEmpty() && SkPaint::kFill_Style == paintStyle) {
	SkPDFUtils::AppendRectangle({0, 0, 0, 0}, content);
	return;
	}
	// Filling a path with no area results in a drawing in PDF renderers but
	// Chrome expects to be able to draw some such entities with no visible
	// result, so we detect those cases and discard the drawing for them.
	// Specifically: moveTo(X), lineTo(Y) and moveTo(X), lineTo(X), lineTo(Y).

	SkRect rect;
	bool isClosed; // Both closure and direction need to be checked.
	SkPath::Direction direction;
	if (path.isRect(&rect, &isClosed, &direction) &&
	isClosed &&
	(SkPath::kCW_Direction == direction \|\|
	SkPath::kEvenOdd_FillType == path.getFillType()))
	{
	SkPDFUtils::AppendRectangle(rect, content);
	return;
	}

	enum SkipFillState {
	kEmpty_SkipFillState,
	kSingleLine_SkipFillState,
	kNonSingleLine_SkipFillState,
	};
	SkipFillState fillState = kEmpty_SkipFillState;
	//if (paintStyle != SkPaint::kFill_Style) {
	// fillState = kNonSingleLine_SkipFillState;
	//}
	SkPoint lastMovePt = SkPoint::Make(0,0);
	SkDynamicMemoryWStream currentSegment;
	SkPoint args[4];
	SkPath::Iter iter(path, false);
	for (SkPath::Verb verb = iter.next(args, doConsumeDegerates);
	verb != SkPath::kDone_Verb;
	verb = iter.next(args, doConsumeDegerates)) {
	// args gets all the points, even the implicit first point.
	switch (verb) {
	case SkPath::kMove_Verb:
	MoveTo(args[0].fX, args[0].fY, &currentSegment);
	lastMovePt = args[0];
	fillState = kEmpty_SkipFillState;
	break;
	case SkPath::kLine_Verb:
	AppendLine(args[1].fX, args[1].fY, &currentSegment);
	if ((fillState == kEmpty_SkipFillState) && (args[0] != lastMovePt)) {
	fillState = kSingleLine_SkipFillState;
	break;
	}
	fillState = kNonSingleLine_SkipFillState;
	break;
	case SkPath::kQuad_Verb:
	append_quad(args, &currentSegment);
	fillState = kNonSingleLine_SkipFillState;
	break;
	case SkPath::kConic_Verb: {
	SkAutoConicToQuads converter;
	const SkPoint* quads = converter.computeQuads(args, iter.conicWeight(), tolerance);
	for (int i = 0; i < converter.countQuads(); ++i) {
	append_quad(&quads[i * 2], &currentSegment);
	}
	fillState = kNonSingleLine_SkipFillState;
	} break;
	case SkPath::kCubic_Verb:
	AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
	args[3].fX, args[3].fY, &currentSegment);
	fillState = kNonSingleLine_SkipFillState;
	break;
	case SkPath::kClose_Verb:
	ClosePath(&currentSegment);
	currentSegment.writeToStream(content);
	currentSegment.reset();
	break;
	default:
	SkASSERT(false);
	break;
	}
	}
	if (currentSegment.bytesWritten() > 0) {
	currentSegment.writeToStream(content);
	}
	}

	// static
	void SkPDFUtils::ClosePath(SkWStream* content) {
	content->writeText("h\n");
	}

	// static
	void SkPDFUtils::PaintPath(SkPaint::Style style, SkPath::FillType fill,
	SkWStream* content) {
	if (style == SkPaint::kFill_Style) {
	content->writeText("f");
	} else if (style == SkPaint::kStrokeAndFill_Style) {
	content->writeText("B");
	} else if (style == SkPaint::kStroke_Style) {
	content->writeText("S");
	}

	if (style != SkPaint::kStroke_Style) {
	NOT_IMPLEMENTED(fill == SkPath::kInverseEvenOdd_FillType, false);
	NOT_IMPLEMENTED(fill == SkPath::kInverseWinding_FillType, false);
	if (fill == SkPath::kEvenOdd_FillType) {
	content->writeText("*");
	}
	}
	content->writeText("\n");
	}

	// static
	void SkPDFUtils::StrokePath(SkWStream* content) {
	SkPDFUtils::PaintPath(
	SkPaint::kStroke_Style, SkPath::kWinding_FillType, content);
	}

	// static
	void SkPDFUtils::DrawFormXObject(int objectIndex, SkWStream* content) {
	content->writeText("/");
	content->writeText(SkPDFResourceDict::getResourceName(
	SkPDFResourceDict::kXObject_ResourceType,
	objectIndex).c_str());
	content->writeText(" Do\n");
	}

	// static
	void SkPDFUtils::ApplyGraphicState(int objectIndex, SkWStream* content) {
	content->writeText("/");
	content->writeText(SkPDFResourceDict::getResourceName(
	SkPDFResourceDict::kExtGState_ResourceType,
	objectIndex).c_str());
	content->writeText(" gs\n");
	}

	// static
	void SkPDFUtils::ApplyPattern(int objectIndex, SkWStream* content) {
	// Select Pattern color space (CS, cs) and set pattern object as current
	// color (SCN, scn)
	SkString resourceName = SkPDFResourceDict::getResourceName(
	SkPDFResourceDict::kPattern_ResourceType,
	objectIndex);
	content->writeText("/Pattern CS/Pattern cs/");
	content->writeText(resourceName.c_str());
	content->writeText(" SCN/");
	content->writeText(resourceName.c_str());
	content->writeText(" scn\n");
	}

	size_t SkPDFUtils::ColorToDecimal(uint8_t value, char result[5]) {
	if (value == 255 \|\| value == 0) {
	result[0] = value ? '1' : '0';
	result[1] = '\0';
	return 1;
	}
	// int x = 0.5 + (1000.0 / 255.0) * value;
	int x = SkFixedRoundToInt((SK_Fixed1 * 1000 / 255) * value);
	result[0] = '.';
	for (int i = 3; i > 0; --i) {
	result[i] = '0' + x % 10;
	x /= 10;
	}
	int j;
	for (j = 3; j > 1; --j) {
	if (result[j] != '0') {
	break;
	}
	}
	result[j + 1] = '\0';
	return j + 1;
	}

	void SkPDFUtils::WriteString(SkWStream* wStream, const char* cin, size_t len) {
	SkDEBUGCODE(static const size_t kMaxLen = 65535;)
	SkASSERT(len <= kMaxLen);

	size_t extraCharacterCount = 0;
	for (size_t i = 0; i < len; i++) {
	if (cin[i] > '~' \|\| cin[i] < ' ') {
	extraCharacterCount += 3;
	}
	if (cin[i] == '\\' \|\| cin[i] == '(' \|\| cin[i] == ')') {
	++extraCharacterCount;
	}
	}
	if (extraCharacterCount <= len) {
	wStream->writeText("(");
	for (size_t i = 0; i < len; i++) {
	if (cin[i] > '~' \|\| cin[i] < ' ') {
	uint8_t c = static_cast<uint8_t>(cin[i]);
	uint8_t octal[4];
	octal[0] = '\\';
	octal[1] = '0' + ( c >> 6 );
	octal[2] = '0' + ((c >> 3) & 0x07);
	octal[3] = '0' + ( c & 0x07);
	wStream->write(octal, 4);
	} else {
	if (cin[i] == '\\' \|\| cin[i] == '(' \|\| cin[i] == ')') {
	wStream->writeText("\\");
	}
	wStream->write(&cin[i], 1);
	}
	}
	wStream->writeText(")");
	} else {
	wStream->writeText("<");
	for (size_t i = 0; i < len; i++) {
	uint8_t c = static_cast<uint8_t>(cin[i]);
	char hexValue[2] = { SkHexadecimalDigits::gUpper[c >> 4],
	SkHexadecimalDigits::gUpper[c & 0xF] };
	wStream->write(hexValue, 2);
	}
	wStream->writeText(">");
	}
	}

	bool SkPDFUtils::InverseTransformBBox(const SkMatrix& matrix, SkRect* bbox) {
	SkMatrix inverse;
	if (!matrix.invert(&inverse)) {
	return false;
	}
	inverse.mapRect(bbox);
	return true;
	}

	void SkPDFUtils::PopulateTilingPatternDict(SkPDFDict* pattern,
	SkRect& bbox,
	sk_sp<SkPDFDict> resources,
	const SkMatrix& matrix) {
	const int kTiling_PatternType = 1;
	const int kColoredTilingPattern_PaintType = 1;
	const int kConstantSpacing_TilingType = 1;

	pattern->insertName("Type", "Pattern");
	pattern->insertInt("PatternType", kTiling_PatternType);
	pattern->insertInt("PaintType", kColoredTilingPattern_PaintType);
	pattern->insertInt("TilingType", kConstantSpacing_TilingType);
	pattern->insertObject("BBox", SkPDFUtils::RectToArray(bbox));
	pattern->insertScalar("XStep", bbox.width());
	pattern->insertScalar("YStep", bbox.height());
	pattern->insertObject("Resources", std::move(resources));
	if (!matrix.isIdentity()) {
	pattern->insertObject("Matrix", SkPDFUtils::MatrixToArray(matrix));
	}
	}

	bool SkPDFUtils::ToBitmap(const SkImage* img, SkBitmap* dst) {
	SkASSERT(img);
	SkASSERT(dst);
	SkBitmap bitmap;
	if(as_IB(img)->getROPixels(&bitmap, nullptr)) {
	SkASSERT(bitmap.dimensions() == img->dimensions());
	SkASSERT(!bitmap.drawsNothing());
	*dst = std::move(bitmap);
	return true;
	}
	return false;
	}