tests/SVGDeviceTest.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #define ABORT_TEST(r, cond, ...)                                   \
     do {                                                           \
         if (cond) {                                                \
             REPORT_FAILURE(r, #cond, SkStringPrintf(__VA_ARGS__)); \
             return;                                                \
         }                                                          \
     } while (0)

 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColorFilter.h"
 #include "SkData.h"
 #include "SkImage.h"
 #include "SkImageShader.h"
 #include "SkParse.h"
 #include "SkShader.h"
 #include "SkStream.h"
 #include "SkTo.h"
 #include "Test.h"

 #include <string.h>

 #ifdef SK_XML

 #include "SkDOM.h"
 #include "SkSVGCanvas.h"
 #include "SkXMLWriter.h"

 #if 0
 Using the new system where devices only gets glyphs causes this to fail because the font has no
 glyph to unichar data.
 namespace {


 void check_text_node(skiatest::Reporter* reporter,
                      const SkDOM& dom,
                      const SkDOM::Node* root,
                      const SkPoint& offset,
                      unsigned scalarsPerPos,
                      const char* expected) {
     if (root == nullptr) {
         ERRORF(reporter, "root element not found.");
         return;
     }

     const SkDOM::Node* textElem = dom.getFirstChild(root, "text");
     if (textElem == nullptr) {
         ERRORF(reporter, "<text> element not found.");
         return;
     }
     REPORTER_ASSERT(reporter, dom.getType(textElem) == SkDOM::kElement_Type);

     const SkDOM::Node* textNode= dom.getFirstChild(textElem);
     REPORTER_ASSERT(reporter, textNode != nullptr);
     if (textNode != nullptr) {
         REPORTER_ASSERT(reporter, dom.getType(textNode) == SkDOM::kText_Type);
         if (strcmp(expected, dom.getName(textNode)) != 0) {
             SkDebugf("string fail %s == %s\n", expected, dom.getName(textNode));
         }
         REPORTER_ASSERT(reporter, strcmp(expected, dom.getName(textNode)) == 0);
     }

     int textLen = SkToInt(strlen(expected));

     const char* x = dom.findAttr(textElem, "x");
     REPORTER_ASSERT(reporter, x != nullptr);
     if (x != nullptr) {
         int xposCount = (scalarsPerPos < 1) ? 1 : textLen;
         REPORTER_ASSERT(reporter, SkParse::Count(x) == xposCount);

         SkAutoTMalloc<SkScalar> xpos(xposCount);
         SkParse::FindScalars(x, xpos.get(), xposCount);
         if (scalarsPerPos < 1) {
             REPORTER_ASSERT(reporter, xpos[0] == offset.x());
         } else {
             for (int i = 0; i < xposCount; ++i) {
                 if (xpos[i] != SkIntToScalar(expected[i])) {
                     SkDebugf("Bad xs %g == %g\n", xpos[i], SkIntToScalar(expected[i]));
                 }
                 REPORTER_ASSERT(reporter, xpos[i] == SkIntToScalar(expected[i]));
             }
         }
     }

     const char* y = dom.findAttr(textElem, "y");
     REPORTER_ASSERT(reporter, y != nullptr);
     if (y != nullptr) {
         int yposCount = (scalarsPerPos < 2) ? 1 : textLen;
         REPORTER_ASSERT(reporter, SkParse::Count(y) == yposCount);

         SkAutoTMalloc<SkScalar> ypos(yposCount);
         SkParse::FindScalars(y, ypos.get(), yposCount);
         if (scalarsPerPos < 2) {
             REPORTER_ASSERT(reporter, ypos[0] == offset.y());
         } else {
             for (int i = 0; i < yposCount; ++i) {
                 REPORTER_ASSERT(reporter, ypos[i] == -SkIntToScalar(expected[i]));
             }
         }
     }
 }

 void test_whitespace_pos(skiatest::Reporter* reporter,
                          const char* txt,
                          const char* expected) {
     size_t len = strlen(txt);

     SkDOM dom;
     SkPaint paint;
     SkPoint offset = SkPoint::Make(10, 20);

     {
         SkXMLParserWriter writer(dom.beginParsing());
         std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
         svgCanvas->drawText(txt, len, offset.x(), offset.y(), paint);
     }
     check_text_node(reporter, dom, dom.finishParsing(), offset, 2, expected);

     {
         SkAutoTMalloc<SkScalar> xpos(len);
         for (int i = 0; i < SkToInt(len); ++i) {
             xpos[i] = SkIntToScalar(txt[i]);
         }

         SkXMLParserWriter writer(dom.beginParsing());
         std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
         svgCanvas->drawPosTextH(txt, len, xpos, offset.y(), paint);
     }
     check_text_node(reporter, dom, dom.finishParsing(), offset, 2, expected);

     {
         SkAutoTMalloc<SkPoint> pos(len);
         for (int i = 0; i < SkToInt(len); ++i) {
             pos[i] = SkPoint::Make(SkIntToScalar(txt[i]), -SkIntToScalar(txt[i]));
         }

         SkXMLParserWriter writer(dom.beginParsing());
         std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
         svgCanvas->drawPosText(txt, len, pos, paint);
     }
     check_text_node(reporter, dom, dom.finishParsing(), offset, 2, expected);
 }

 }


 DEF_TEST(SVGDevice_whitespace_pos, reporter) {
     static const struct {
         const char* tst_in;
         const char* tst_out;
     } tests[] = {
         { "abcd"      , "abcd" },
         { "ab cd"     , "ab cd" },
         { "ab \t\t cd", "ab cd" },
         { " abcd"     , "abcd" },
         { "  abcd"    , "abcd" },
         { " \t\t abcd", "abcd" },
         { "abcd "     , "abcd " }, // we allow one trailing whitespace char
         { "abcd  "    , "abcd " }, // because it makes no difference and
         { "abcd\t  "  , "abcd\t" }, // simplifies the implementation
         { "\t\t  \t ab \t\t  \t cd \t\t   \t  ", "ab cd " },
     };

     for (unsigned i = 0; i < SK_ARRAY_COUNT(tests); ++i) {
         test_whitespace_pos(reporter, tests[i].tst_in, tests[i].tst_out);
     }
 }
 #endif


 void SetImageShader(SkPaint* paint, int imageWidth, int imageHeight, SkShader::TileMode xTile,
                     SkShader::TileMode yTile) {
     auto surface = SkSurface::MakeRasterN32Premul(imageWidth, imageHeight);
     paint->setShader(SkImageShader::Make(surface->makeImageSnapshot(), xTile, yTile, nullptr));
 }

 // Attempt to find the three nodes on which we have expectations:
 // the pattern node, the image within that pattern, and the rect which
 // uses the pattern as a fill.
 // returns false if not all nodes are found.
 bool FindImageShaderNodes(skiatest::Reporter* reporter, const SkDOM* dom, const SkDOM::Node* root,
                           const SkDOM::Node** patternOut, const SkDOM::Node** imageOut,
                           const SkDOM::Node** rectOut) {
     if (root == nullptr || dom == nullptr) {
         ERRORF(reporter, "root element not found");
         return false;
     }


     const SkDOM::Node* rect = dom->getFirstChild(root, "rect");
     if (rect == nullptr) {
         ERRORF(reporter, "rect not found");
         return false;
     }
     *rectOut = rect;

     const SkDOM::Node* defs = dom->getFirstChild(root, "defs");
     if (defs == nullptr) {
         ERRORF(reporter, "defs not found");
         return false;
     }

     const SkDOM::Node* pattern = dom->getFirstChild(defs, "pattern");
     if (pattern == nullptr) {
         ERRORF(reporter, "pattern not found");
         return false;
     }
     *patternOut = pattern;

     const SkDOM::Node* image = dom->getFirstChild(pattern, "image");
     if (image == nullptr) {
         ERRORF(reporter, "image not found");
         return false;
     }
     *imageOut = image;

     return true;
 }

 void ImageShaderTestSetup(SkDOM* dom, SkPaint* paint, int imageWidth, int imageHeight,
                           int rectWidth, int rectHeight, SkShader::TileMode xTile,
                           SkShader::TileMode yTile) {
     SetImageShader(paint, imageWidth, imageHeight, xTile, yTile);
     SkXMLParserWriter writer(dom->beginParsing());
     std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);

     SkRect bounds{0, 0, SkIntToScalar(rectWidth), SkIntToScalar(rectHeight)};
     svgCanvas->drawRect(bounds, *paint);
 }


 DEF_TEST(SVGDevice_image_shader_norepeat, reporter) {
     SkDOM dom;
     SkPaint paint;
     int imageWidth = 3, imageHeight = 3;
     int rectWidth = 10, rectHeight = 10;
     ImageShaderTestSetup(&dom, &paint, imageWidth, imageHeight, rectWidth, rectHeight,
                          SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);

     const SkDOM::Node* root = dom.finishParsing();

     const SkDOM::Node *patternNode, *imageNode, *rectNode;
     bool structureAppropriate =
             FindImageShaderNodes(reporter, &dom, root, &patternNode, &imageNode, &rectNode);
     REPORTER_ASSERT(reporter, structureAppropriate);

     // the image should always maintain its size.
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageWidth);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageHeight);

     // making the pattern as large as the container prevents
     // it from repeating.
     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "width"), "100%") == 0);
     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "height"), "100%") == 0);
 }

 DEF_TEST(SVGDevice_image_shader_tilex, reporter) {
     SkDOM dom;
     SkPaint paint;
     int imageWidth = 3, imageHeight = 3;
     int rectWidth = 10, rectHeight = 10;
     ImageShaderTestSetup(&dom, &paint, imageWidth, imageHeight, rectWidth, rectHeight,
                          SkShader::kRepeat_TileMode, SkShader::kClamp_TileMode);

     const SkDOM::Node* root = dom.finishParsing();
     const SkDOM::Node* innerSvg = dom.getFirstChild(root, "svg");
     if (innerSvg == nullptr) {
         ERRORF(reporter, "inner svg element not found");
         return;
     }

     const SkDOM::Node *patternNode, *imageNode, *rectNode;
     bool structureAppropriate =
             FindImageShaderNodes(reporter, &dom, innerSvg, &patternNode, &imageNode, &rectNode);
     REPORTER_ASSERT(reporter, structureAppropriate);

     // the imageNode should always maintain its size.
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageWidth);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageHeight);

     // if the patternNode width matches the imageNode width,
     // it will repeat in along the x axis.
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "width")) == imageWidth);
     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "height"), "100%") == 0);
 }

 DEF_TEST(SVGDevice_image_shader_tiley, reporter) {
     SkDOM dom;
     SkPaint paint;
     int imageNodeWidth = 3, imageNodeHeight = 3;
     int rectNodeWidth = 10, rectNodeHeight = 10;
     ImageShaderTestSetup(&dom, &paint, imageNodeWidth, imageNodeHeight, rectNodeWidth,
                          rectNodeHeight, SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode);

     const SkDOM::Node* root = dom.finishParsing();
     const SkDOM::Node* innerSvg = dom.getFirstChild(root, "svg");
     if (innerSvg == nullptr) {
         ERRORF(reporter, "inner svg element not found");
         return;
     }

     const SkDOM::Node *patternNode, *imageNode, *rectNode;
     bool structureAppropriate =
             FindImageShaderNodes(reporter, &dom, innerSvg, &patternNode, &imageNode, &rectNode);
     REPORTER_ASSERT(reporter, structureAppropriate);

     // the imageNode should always maintain its size.
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageNodeWidth);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageNodeHeight);

     // making the patternNode as large as the container prevents
     // it from repeating.
     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "width"), "100%") == 0);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "height")) == imageNodeHeight);
 }

 DEF_TEST(SVGDevice_image_shader_tileboth, reporter) {
     SkDOM dom;
     SkPaint paint;
     int imageWidth = 3, imageHeight = 3;
     int rectWidth = 10, rectHeight = 10;
     ImageShaderTestSetup(&dom, &paint, imageWidth, imageHeight, rectWidth, rectHeight,
                          SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);

     const SkDOM::Node* root = dom.finishParsing();

     const SkDOM::Node *patternNode, *imageNode, *rectNode;
     const SkDOM::Node* innerSvg = dom.getFirstChild(root, "svg");
     if (innerSvg == nullptr) {
         ERRORF(reporter, "inner svg element not found");
         return;
     }
     bool structureAppropriate =
             FindImageShaderNodes(reporter, &dom, innerSvg, &patternNode, &imageNode, &rectNode);
     REPORTER_ASSERT(reporter, structureAppropriate);

     // the imageNode should always maintain its size.
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageWidth);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageHeight);

     REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "width")) == imageWidth);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "height")) == imageHeight);
 }

 DEF_TEST(SVGDevice_ColorFilters, reporter) {
     SkDOM dom;
     SkPaint paint;
     paint.setColorFilter(SkColorFilter::MakeModeFilter(SK_ColorRED, SkBlendMode::kSrcIn));
     {
         SkXMLParserWriter writer(dom.beginParsing());
         std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
         SkRect bounds{0, 0, SkIntToScalar(100), SkIntToScalar(100)};
         svgCanvas->drawRect(bounds, paint);
     }
     const SkDOM::Node* rootElement = dom.finishParsing();
     ABORT_TEST(reporter, !rootElement, "root element not found");

     const SkDOM::Node* filterElement = dom.getFirstChild(rootElement, "filter");
     ABORT_TEST(reporter, !filterElement, "filter element not found");

     const SkDOM::Node* floodElement = dom.getFirstChild(filterElement, "feFlood");
     ABORT_TEST(reporter, !floodElement, "feFlood element not found");

     const SkDOM::Node* compositeElement = dom.getFirstChild(filterElement, "feComposite");
     ABORT_TEST(reporter, !compositeElement, "feComposite element not found");

     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(filterElement, "width"), "100%") == 0);
     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(filterElement, "height"), "100%") == 0);

     REPORTER_ASSERT(reporter,
                     strcmp(dom.findAttr(floodElement, "flood-color"), "rgb(255,0,0)") == 0);
     REPORTER_ASSERT(reporter, atoi(dom.findAttr(floodElement, "flood-opacity")) == 1);

     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(compositeElement, "in"), "flood") == 0);
     REPORTER_ASSERT(reporter, strcmp(dom.findAttr(compositeElement, "operator"), "in") == 0);
 }

 #endif
	/*
	* Copyright 2015 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#define ABORT_TEST(r, cond, ...) \
	do { \
	if (cond) { \
	REPORT_FAILURE(r, #cond, SkStringPrintf(__VA_ARGS__)); \
	return; \
	} \
	} while (0)

	#include "SkBitmap.h"
	#include "SkCanvas.h"
	#include "SkColorFilter.h"
	#include "SkData.h"
	#include "SkImage.h"
	#include "SkImageShader.h"
	#include "SkParse.h"
	#include "SkShader.h"
	#include "SkStream.h"
	#include "SkTo.h"
	#include "Test.h"

	#include <string.h>

	#ifdef SK_XML

	#include "SkDOM.h"
	#include "SkSVGCanvas.h"
	#include "SkXMLWriter.h"

	#if 0
	Using the new system where devices only gets glyphs causes this to fail because the font has no
	glyph to unichar data.
	namespace {


	void check_text_node(skiatest::Reporter* reporter,
	const SkDOM& dom,
	const SkDOM::Node* root,
	const SkPoint& offset,
	unsigned scalarsPerPos,
	const char* expected) {
	if (root == nullptr) {
	ERRORF(reporter, "root element not found.");
	return;
	}

	const SkDOM::Node* textElem = dom.getFirstChild(root, "text");
	if (textElem == nullptr) {
	ERRORF(reporter, "<text> element not found.");
	return;
	}
	REPORTER_ASSERT(reporter, dom.getType(textElem) == SkDOM::kElement_Type);

	const SkDOM::Node* textNode= dom.getFirstChild(textElem);
	REPORTER_ASSERT(reporter, textNode != nullptr);
	if (textNode != nullptr) {
	REPORTER_ASSERT(reporter, dom.getType(textNode) == SkDOM::kText_Type);
	if (strcmp(expected, dom.getName(textNode)) != 0) {
	SkDebugf("string fail %s == %s\n", expected, dom.getName(textNode));
	}
	REPORTER_ASSERT(reporter, strcmp(expected, dom.getName(textNode)) == 0);
	}

	int textLen = SkToInt(strlen(expected));

	const char* x = dom.findAttr(textElem, "x");
	REPORTER_ASSERT(reporter, x != nullptr);
	if (x != nullptr) {
	int xposCount = (scalarsPerPos < 1) ? 1 : textLen;
	REPORTER_ASSERT(reporter, SkParse::Count(x) == xposCount);

	SkAutoTMalloc<SkScalar> xpos(xposCount);
	SkParse::FindScalars(x, xpos.get(), xposCount);
	if (scalarsPerPos < 1) {
	REPORTER_ASSERT(reporter, xpos[0] == offset.x());
	} else {
	for (int i = 0; i < xposCount; ++i) {
	if (xpos[i] != SkIntToScalar(expected[i])) {
	SkDebugf("Bad xs %g == %g\n", xpos[i], SkIntToScalar(expected[i]));
	}
	REPORTER_ASSERT(reporter, xpos[i] == SkIntToScalar(expected[i]));
	}
	}
	}

	const char* y = dom.findAttr(textElem, "y");
	REPORTER_ASSERT(reporter, y != nullptr);
	if (y != nullptr) {
	int yposCount = (scalarsPerPos < 2) ? 1 : textLen;
	REPORTER_ASSERT(reporter, SkParse::Count(y) == yposCount);

	SkAutoTMalloc<SkScalar> ypos(yposCount);
	SkParse::FindScalars(y, ypos.get(), yposCount);
	if (scalarsPerPos < 2) {
	REPORTER_ASSERT(reporter, ypos[0] == offset.y());
	} else {
	for (int i = 0; i < yposCount; ++i) {
	REPORTER_ASSERT(reporter, ypos[i] == -SkIntToScalar(expected[i]));
	}
	}
	}
	}

	void test_whitespace_pos(skiatest::Reporter* reporter,
	const char* txt,
	const char* expected) {
	size_t len = strlen(txt);

	SkDOM dom;
	SkPaint paint;
	SkPoint offset = SkPoint::Make(10, 20);

	{
	SkXMLParserWriter writer(dom.beginParsing());
	std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
	svgCanvas->drawText(txt, len, offset.x(), offset.y(), paint);
	}
	check_text_node(reporter, dom, dom.finishParsing(), offset, 2, expected);

	{
	SkAutoTMalloc<SkScalar> xpos(len);
	for (int i = 0; i < SkToInt(len); ++i) {
	xpos[i] = SkIntToScalar(txt[i]);
	}

	SkXMLParserWriter writer(dom.beginParsing());
	std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
	svgCanvas->drawPosTextH(txt, len, xpos, offset.y(), paint);
	}
	check_text_node(reporter, dom, dom.finishParsing(), offset, 2, expected);

	{
	SkAutoTMalloc<SkPoint> pos(len);
	for (int i = 0; i < SkToInt(len); ++i) {
	pos[i] = SkPoint::Make(SkIntToScalar(txt[i]), -SkIntToScalar(txt[i]));
	}

	SkXMLParserWriter writer(dom.beginParsing());
	std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
	svgCanvas->drawPosText(txt, len, pos, paint);
	}
	check_text_node(reporter, dom, dom.finishParsing(), offset, 2, expected);
	}

	}


	DEF_TEST(SVGDevice_whitespace_pos, reporter) {
	static const struct {
	const char* tst_in;
	const char* tst_out;
	} tests[] = {
	{ "abcd" , "abcd" },
	{ "ab cd" , "ab cd" },
	{ "ab \t\t cd", "ab cd" },
	{ " abcd" , "abcd" },
	{ " abcd" , "abcd" },
	{ " \t\t abcd", "abcd" },
	{ "abcd " , "abcd " }, // we allow one trailing whitespace char
	{ "abcd " , "abcd " }, // because it makes no difference and
	{ "abcd\t " , "abcd\t" }, // simplifies the implementation
	{ "\t\t \t ab \t\t \t cd \t\t \t ", "ab cd " },
	};

	for (unsigned i = 0; i < SK_ARRAY_COUNT(tests); ++i) {
	test_whitespace_pos(reporter, tests[i].tst_in, tests[i].tst_out);
	}
	}
	#endif


	void SetImageShader(SkPaint* paint, int imageWidth, int imageHeight, SkShader::TileMode xTile,
	SkShader::TileMode yTile) {
	auto surface = SkSurface::MakeRasterN32Premul(imageWidth, imageHeight);
	paint->setShader(SkImageShader::Make(surface->makeImageSnapshot(), xTile, yTile, nullptr));
	}

	// Attempt to find the three nodes on which we have expectations:
	// the pattern node, the image within that pattern, and the rect which
	// uses the pattern as a fill.
	// returns false if not all nodes are found.
	bool FindImageShaderNodes(skiatest::Reporter* reporter, const SkDOM* dom, const SkDOM::Node* root,
	const SkDOM::Node patternOut, const SkDOM::Node imageOut,
	const SkDOM::Node** rectOut) {
	if (root == nullptr \|\| dom == nullptr) {
	ERRORF(reporter, "root element not found");
	return false;
	}


	const SkDOM::Node* rect = dom->getFirstChild(root, "rect");
	if (rect == nullptr) {
	ERRORF(reporter, "rect not found");
	return false;
	}
	*rectOut = rect;

	const SkDOM::Node* defs = dom->getFirstChild(root, "defs");
	if (defs == nullptr) {
	ERRORF(reporter, "defs not found");
	return false;
	}

	const SkDOM::Node* pattern = dom->getFirstChild(defs, "pattern");
	if (pattern == nullptr) {
	ERRORF(reporter, "pattern not found");
	return false;
	}
	*patternOut = pattern;

	const SkDOM::Node* image = dom->getFirstChild(pattern, "image");
	if (image == nullptr) {
	ERRORF(reporter, "image not found");
	return false;
	}
	*imageOut = image;

	return true;
	}

	void ImageShaderTestSetup(SkDOM* dom, SkPaint* paint, int imageWidth, int imageHeight,
	int rectWidth, int rectHeight, SkShader::TileMode xTile,
	SkShader::TileMode yTile) {
	SetImageShader(paint, imageWidth, imageHeight, xTile, yTile);
	SkXMLParserWriter writer(dom->beginParsing());
	std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);

	SkRect bounds{0, 0, SkIntToScalar(rectWidth), SkIntToScalar(rectHeight)};
	svgCanvas->drawRect(bounds, *paint);
	}


	DEF_TEST(SVGDevice_image_shader_norepeat, reporter) {
	SkDOM dom;
	SkPaint paint;
	int imageWidth = 3, imageHeight = 3;
	int rectWidth = 10, rectHeight = 10;
	ImageShaderTestSetup(&dom, &paint, imageWidth, imageHeight, rectWidth, rectHeight,
	SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);

	const SkDOM::Node* root = dom.finishParsing();

	const SkDOM::Node patternNode, imageNode, *rectNode;
	bool structureAppropriate =
	FindImageShaderNodes(reporter, &dom, root, &patternNode, &imageNode, &rectNode);
	REPORTER_ASSERT(reporter, structureAppropriate);

	// the image should always maintain its size.
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageWidth);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageHeight);

	// making the pattern as large as the container prevents
	// it from repeating.
	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "width"), "100%") == 0);
	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "height"), "100%") == 0);
	}

	DEF_TEST(SVGDevice_image_shader_tilex, reporter) {
	SkDOM dom;
	SkPaint paint;
	int imageWidth = 3, imageHeight = 3;
	int rectWidth = 10, rectHeight = 10;
	ImageShaderTestSetup(&dom, &paint, imageWidth, imageHeight, rectWidth, rectHeight,
	SkShader::kRepeat_TileMode, SkShader::kClamp_TileMode);

	const SkDOM::Node* root = dom.finishParsing();
	const SkDOM::Node* innerSvg = dom.getFirstChild(root, "svg");
	if (innerSvg == nullptr) {
	ERRORF(reporter, "inner svg element not found");
	return;
	}

	const SkDOM::Node patternNode, imageNode, *rectNode;
	bool structureAppropriate =
	FindImageShaderNodes(reporter, &dom, innerSvg, &patternNode, &imageNode, &rectNode);
	REPORTER_ASSERT(reporter, structureAppropriate);

	// the imageNode should always maintain its size.
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageWidth);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageHeight);

	// if the patternNode width matches the imageNode width,
	// it will repeat in along the x axis.
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "width")) == imageWidth);
	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "height"), "100%") == 0);
	}

	DEF_TEST(SVGDevice_image_shader_tiley, reporter) {
	SkDOM dom;
	SkPaint paint;
	int imageNodeWidth = 3, imageNodeHeight = 3;
	int rectNodeWidth = 10, rectNodeHeight = 10;
	ImageShaderTestSetup(&dom, &paint, imageNodeWidth, imageNodeHeight, rectNodeWidth,
	rectNodeHeight, SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode);

	const SkDOM::Node* root = dom.finishParsing();
	const SkDOM::Node* innerSvg = dom.getFirstChild(root, "svg");
	if (innerSvg == nullptr) {
	ERRORF(reporter, "inner svg element not found");
	return;
	}

	const SkDOM::Node patternNode, imageNode, *rectNode;
	bool structureAppropriate =
	FindImageShaderNodes(reporter, &dom, innerSvg, &patternNode, &imageNode, &rectNode);
	REPORTER_ASSERT(reporter, structureAppropriate);

	// the imageNode should always maintain its size.
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageNodeWidth);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageNodeHeight);

	// making the patternNode as large as the container prevents
	// it from repeating.
	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(patternNode, "width"), "100%") == 0);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "height")) == imageNodeHeight);
	}

	DEF_TEST(SVGDevice_image_shader_tileboth, reporter) {
	SkDOM dom;
	SkPaint paint;
	int imageWidth = 3, imageHeight = 3;
	int rectWidth = 10, rectHeight = 10;
	ImageShaderTestSetup(&dom, &paint, imageWidth, imageHeight, rectWidth, rectHeight,
	SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);

	const SkDOM::Node* root = dom.finishParsing();

	const SkDOM::Node patternNode, imageNode, *rectNode;
	const SkDOM::Node* innerSvg = dom.getFirstChild(root, "svg");
	if (innerSvg == nullptr) {
	ERRORF(reporter, "inner svg element not found");
	return;
	}
	bool structureAppropriate =
	FindImageShaderNodes(reporter, &dom, innerSvg, &patternNode, &imageNode, &rectNode);
	REPORTER_ASSERT(reporter, structureAppropriate);

	// the imageNode should always maintain its size.
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "width")) == imageWidth);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(imageNode, "height")) == imageHeight);

	REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "width")) == imageWidth);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(patternNode, "height")) == imageHeight);
	}

	DEF_TEST(SVGDevice_ColorFilters, reporter) {
	SkDOM dom;
	SkPaint paint;
	paint.setColorFilter(SkColorFilter::MakeModeFilter(SK_ColorRED, SkBlendMode::kSrcIn));
	{
	SkXMLParserWriter writer(dom.beginParsing());
	std::unique_ptr<SkCanvas> svgCanvas = SkSVGCanvas::Make(SkRect::MakeWH(100, 100), &writer);
	SkRect bounds{0, 0, SkIntToScalar(100), SkIntToScalar(100)};
	svgCanvas->drawRect(bounds, paint);
	}
	const SkDOM::Node* rootElement = dom.finishParsing();
	ABORT_TEST(reporter, !rootElement, "root element not found");

	const SkDOM::Node* filterElement = dom.getFirstChild(rootElement, "filter");
	ABORT_TEST(reporter, !filterElement, "filter element not found");

	const SkDOM::Node* floodElement = dom.getFirstChild(filterElement, "feFlood");
	ABORT_TEST(reporter, !floodElement, "feFlood element not found");

	const SkDOM::Node* compositeElement = dom.getFirstChild(filterElement, "feComposite");
	ABORT_TEST(reporter, !compositeElement, "feComposite element not found");

	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(filterElement, "width"), "100%") == 0);
	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(filterElement, "height"), "100%") == 0);

	REPORTER_ASSERT(reporter,
	strcmp(dom.findAttr(floodElement, "flood-color"), "rgb(255,0,0)") == 0);
	REPORTER_ASSERT(reporter, atoi(dom.findAttr(floodElement, "flood-opacity")) == 1);

	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(compositeElement, "in"), "flood") == 0);
	REPORTER_ASSERT(reporter, strcmp(dom.findAttr(compositeElement, "operator"), "in") == 0);
	}

	#endif