tests/AAClipTest.cpp - platform/external/skqp - Gitiles

 /*
  * 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 "SkAAClip.h"
 #include "SkCanvas.h"
 #include "SkMask.h"
 #include "SkPath.h"
 #include "SkRandom.h"
 #include "SkRRect.h"
 #include "Test.h"

 static bool operator==(const SkMask& a, const SkMask& b) {
     if (a.fFormat != b.fFormat || a.fBounds != b.fBounds) {
         return false;
     }
     if (!a.fImage && !b.fImage) {
         return true;
     }
     if (!a.fImage || !b.fImage) {
         return false;
     }

     size_t wbytes = a.fBounds.width();
     switch (a.fFormat) {
         case SkMask::kBW_Format:
             wbytes = (wbytes + 7) >> 3;
             break;
         case SkMask::kA8_Format:
         case SkMask::k3D_Format:
             break;
         case SkMask::kLCD16_Format:
             wbytes <<= 1;
             break;
         case SkMask::kARGB32_Format:
             wbytes <<= 2;
             break;
         default:
             SkDEBUGFAIL("unknown mask format");
             return false;
     }

     const int h = a.fBounds.height();
     const char* aptr = (const char*)a.fImage;
     const char* bptr = (const char*)b.fImage;
     for (int y = 0; y < h; ++y) {
         if (memcmp(aptr, bptr, wbytes)) {
             return false;
         }
         aptr += wbytes;
         bptr += wbytes;
     }
     return true;
 }

 static void copyToMask(const SkRegion& rgn, SkMask* mask) {
     mask->fFormat = SkMask::kA8_Format;

     if (rgn.isEmpty()) {
         mask->fBounds.setEmpty();
         mask->fRowBytes = 0;
         mask->fImage = nullptr;
         return;
     }

     mask->fBounds = rgn.getBounds();
     mask->fRowBytes = mask->fBounds.width();
     mask->fImage = SkMask::AllocImage(mask->computeImageSize());
     sk_bzero(mask->fImage, mask->computeImageSize());

     SkImageInfo info = SkImageInfo::Make(mask->fBounds.width(),
                                          mask->fBounds.height(),
                                          kAlpha_8_SkColorType,
                                          kPremul_SkAlphaType);
     SkBitmap bitmap;
     bitmap.installPixels(info, mask->fImage, mask->fRowBytes);

     // canvas expects its coordinate system to always be 0,0 in the top/left
     // so we translate the rgn to match that before drawing into the mask.
     //
     SkRegion tmpRgn(rgn);
     tmpRgn.translate(-rgn.getBounds().fLeft, -rgn.getBounds().fTop);

     SkCanvas canvas(bitmap);
     canvas.clipRegion(tmpRgn);
     canvas.drawColor(SK_ColorBLACK);
 }

 static SkIRect rand_rect(SkRandom& rand, int n) {
     int x = rand.nextS() % n;
     int y = rand.nextS() % n;
     int w = rand.nextU() % n;
     int h = rand.nextU() % n;
     return SkIRect::MakeXYWH(x, y, w, h);
 }

 static void make_rand_rgn(SkRegion* rgn, SkRandom& rand) {
     int count = rand.nextU() % 20;
     for (int i = 0; i < count; ++i) {
         rgn->op(rand_rect(rand, 100), SkRegion::kXOR_Op);
     }
 }

 static bool operator==(const SkRegion& rgn, const SkAAClip& aaclip) {
     SkMask mask0, mask1;

     copyToMask(rgn, &mask0);
     aaclip.copyToMask(&mask1);
     bool eq = (mask0 == mask1);

     SkMask::FreeImage(mask0.fImage);
     SkMask::FreeImage(mask1.fImage);
     return eq;
 }

 static bool equalsAAClip(const SkRegion& rgn) {
     SkAAClip aaclip;
     aaclip.setRegion(rgn);
     return rgn == aaclip;
 }

 static void setRgnToPath(SkRegion* rgn, const SkPath& path) {
     SkIRect ir;
     path.getBounds().round(&ir);
     rgn->setPath(path, SkRegion(ir));
 }

 // aaclip.setRegion should create idential masks to the region
 static void test_rgn(skiatest::Reporter* reporter) {
     SkRandom rand;
     for (int i = 0; i < 1000; i++) {
         SkRegion rgn;
         make_rand_rgn(&rgn, rand);
         REPORTER_ASSERT(reporter, equalsAAClip(rgn));
     }

     {
         SkRegion rgn;
         SkPath path;
         path.addCircle(0, 0, SkIntToScalar(30));
         setRgnToPath(&rgn, path);
         REPORTER_ASSERT(reporter, equalsAAClip(rgn));

         path.reset();
         path.moveTo(0, 0);
         path.lineTo(SkIntToScalar(100), 0);
         path.lineTo(SkIntToScalar(100 - 20), SkIntToScalar(20));
         path.lineTo(SkIntToScalar(20), SkIntToScalar(20));
         setRgnToPath(&rgn, path);
         REPORTER_ASSERT(reporter, equalsAAClip(rgn));
     }
 }

 static const SkRegion::Op gRgnOps[] = {
     SkRegion::kDifference_Op,
     SkRegion::kIntersect_Op,
     SkRegion::kUnion_Op,
     SkRegion::kXOR_Op,
     SkRegion::kReverseDifference_Op,
     SkRegion::kReplace_Op
 };

 static const char* gRgnOpNames[] = {
     "DIFF", "INTERSECT", "UNION", "XOR", "REVERSE_DIFF", "REPLACE"
 };

 static void imoveTo(SkPath& path, int x, int y) {
     path.moveTo(SkIntToScalar(x), SkIntToScalar(y));
 }

 static void icubicTo(SkPath& path, int x0, int y0, int x1, int y1, int x2, int y2) {
     path.cubicTo(SkIntToScalar(x0), SkIntToScalar(y0),
                  SkIntToScalar(x1), SkIntToScalar(y1),
                  SkIntToScalar(x2), SkIntToScalar(y2));
 }

 static void test_path_bounds(skiatest::Reporter* reporter) {
     SkPath path;
     SkAAClip clip;
     const int height = 40;
     const SkScalar sheight = SkIntToScalar(height);

     path.addOval(SkRect::MakeWH(sheight, sheight));
     REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
     clip.setPath(path, nullptr, true);
     REPORTER_ASSERT(reporter, height == clip.getBounds().height());

     // this is the trimmed height of this cubic (with aa). The critical thing
     // for this test is that it is less than height, which represents just
     // the bounds of the path's control-points.
     //
     // This used to fail until we tracked the MinY in the BuilderBlitter.
     //
     const int teardrop_height = 12;
     path.reset();
     imoveTo(path, 0, 20);
     icubicTo(path, 40, 40, 40, 0, 0, 20);
     REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
     clip.setPath(path, nullptr, true);
     REPORTER_ASSERT(reporter, teardrop_height == clip.getBounds().height());
 }

 static void test_empty(skiatest::Reporter* reporter) {
     SkAAClip clip0, clip1;

     REPORTER_ASSERT(reporter, clip0.isEmpty());
     REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
     REPORTER_ASSERT(reporter, clip1 == clip0);

     clip0.translate(10, 10);    // should have no effect on empty
     REPORTER_ASSERT(reporter, clip0.isEmpty());
     REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
     REPORTER_ASSERT(reporter, clip1 == clip0);

     SkIRect r = { 10, 10, 40, 50 };
     clip0.setRect(r);
     REPORTER_ASSERT(reporter, !clip0.isEmpty());
     REPORTER_ASSERT(reporter, !clip0.getBounds().isEmpty());
     REPORTER_ASSERT(reporter, clip0 != clip1);
     REPORTER_ASSERT(reporter, clip0.getBounds() == r);

     clip0.setEmpty();
     REPORTER_ASSERT(reporter, clip0.isEmpty());
     REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
     REPORTER_ASSERT(reporter, clip1 == clip0);

     SkMask mask;
     clip0.copyToMask(&mask);
     REPORTER_ASSERT(reporter, nullptr == mask.fImage);
     REPORTER_ASSERT(reporter, mask.fBounds.isEmpty());
 }

 static void rand_irect(SkIRect* r, int N, SkRandom& rand) {
     r->setXYWH(0, 0, rand.nextU() % N, rand.nextU() % N);
     int dx = rand.nextU() % (2*N);
     int dy = rand.nextU() % (2*N);
     // use int dx,dy to make the subtract be signed
     r->offset(N - dx, N - dy);
 }

 static void test_irect(skiatest::Reporter* reporter) {
     SkRandom rand;

     for (int i = 0; i < 10000; i++) {
         SkAAClip clip0, clip1;
         SkRegion rgn0, rgn1;
         SkIRect r0, r1;

         rand_irect(&r0, 10, rand);
         rand_irect(&r1, 10, rand);
         clip0.setRect(r0);
         clip1.setRect(r1);
         rgn0.setRect(r0);
         rgn1.setRect(r1);
         for (size_t j = 0; j < SK_ARRAY_COUNT(gRgnOps); ++j) {
             SkRegion::Op op = gRgnOps[j];
             SkAAClip clip2;
             SkRegion rgn2;
             bool nonEmptyAA = clip2.op(clip0, clip1, op);
             bool nonEmptyBW = rgn2.op(rgn0, rgn1, op);
             if (nonEmptyAA != nonEmptyBW || clip2.getBounds() != rgn2.getBounds()) {
                 ERRORF(reporter, "%s %s "
                        "[%d %d %d %d] %s [%d %d %d %d] = BW:[%d %d %d %d] AA:[%d %d %d %d]\n",
                        nonEmptyAA == nonEmptyBW ? "true" : "false",
                        clip2.getBounds() == rgn2.getBounds() ? "true" : "false",
                        r0.fLeft, r0.fTop, r0.right(), r0.bottom(),
                        gRgnOpNames[j],
                        r1.fLeft, r1.fTop, r1.right(), r1.bottom(),
                        rgn2.getBounds().fLeft, rgn2.getBounds().fTop,
                        rgn2.getBounds().right(), rgn2.getBounds().bottom(),
                        clip2.getBounds().fLeft, clip2.getBounds().fTop,
                        clip2.getBounds().right(), clip2.getBounds().bottom());
             }

             SkMask maskBW, maskAA;
             copyToMask(rgn2, &maskBW);
             clip2.copyToMask(&maskAA);
             SkAutoMaskFreeImage freeBW(maskBW.fImage);
             SkAutoMaskFreeImage freeAA(maskAA.fImage);
             REPORTER_ASSERT(reporter, maskBW == maskAA);
         }
     }
 }

 static void test_path_with_hole(skiatest::Reporter* reporter) {
     static const uint8_t gExpectedImage[] = {
         0xFF, 0xFF, 0xFF, 0xFF,
         0xFF, 0xFF, 0xFF, 0xFF,
         0x00, 0x00, 0x00, 0x00,
         0x00, 0x00, 0x00, 0x00,
         0xFF, 0xFF, 0xFF, 0xFF,
         0xFF, 0xFF, 0xFF, 0xFF,
     };
     SkMask expected;
     expected.fBounds.set(0, 0, 4, 6);
     expected.fRowBytes = 4;
     expected.fFormat = SkMask::kA8_Format;
     expected.fImage = (uint8_t*)gExpectedImage;

     SkPath path;
     path.addRect(SkRect::MakeXYWH(0, 0,
                                   SkIntToScalar(4), SkIntToScalar(2)));
     path.addRect(SkRect::MakeXYWH(0, SkIntToScalar(4),
                                   SkIntToScalar(4), SkIntToScalar(2)));

     for (int i = 0; i < 2; ++i) {
         SkAAClip clip;
         clip.setPath(path, nullptr, 1 == i);

         SkMask mask;
         clip.copyToMask(&mask);
         SkAutoMaskFreeImage freeM(mask.fImage);

         REPORTER_ASSERT(reporter, expected == mask);
     }
 }

 static void test_really_a_rect(skiatest::Reporter* reporter) {
     SkRRect rrect;
     rrect.setRectXY(SkRect::MakeWH(100, 100), 5, 5);

     SkPath path;
     path.addRRect(rrect);

     SkAAClip clip;
     clip.setPath(path);

     REPORTER_ASSERT(reporter, clip.getBounds() == SkIRect::MakeWH(100, 100));
     REPORTER_ASSERT(reporter, !clip.isRect());

     // This rect should intersect the clip, but slice-out all of the "soft" parts,
     // leaving just a rect.
     const SkIRect ir = SkIRect::MakeLTRB(10, -10, 50, 90);

     clip.op(ir, SkRegion::kIntersect_Op);

     REPORTER_ASSERT(reporter, clip.getBounds() == SkIRect::MakeLTRB(10, 0, 50, 90));
     // the clip recognized that that it is just a rect!
     REPORTER_ASSERT(reporter, clip.isRect());
 }

 #include "SkRasterClip.h"

 static void copyToMask(const SkRasterClip& rc, SkMask* mask) {
     if (rc.isAA()) {
         rc.aaRgn().copyToMask(mask);
     } else {
         copyToMask(rc.bwRgn(), mask);
     }
 }

 static bool operator==(const SkRasterClip& a, const SkRasterClip& b) {
     if (a.isEmpty()) {
         return b.isEmpty();
     }
     if (b.isEmpty()) {
         return false;
     }

     SkMask ma, mb;
     copyToMask(a, &ma);
     copyToMask(b, &mb);
     SkAutoMaskFreeImage aCleanUp(ma.fImage);
     SkAutoMaskFreeImage bCleanUp(mb.fImage);

     return ma == mb;
 }

 static void did_dx_affect(skiatest::Reporter* reporter, const SkScalar dx[],
                           size_t count, bool changed) {
     const SkIRect baseBounds = SkIRect::MakeXYWH(0, 0, 10, 10);
     SkIRect ir = { 0, 0, 10, 10 };

     for (size_t i = 0; i < count; ++i) {
         SkRect r;
         r.set(ir);

         SkRasterClip rc0(ir);
         SkRasterClip rc1(ir);
         SkRasterClip rc2(ir);

         rc0.op(r, baseBounds, SkRegion::kIntersect_Op, false);
         r.offset(dx[i], 0);
         rc1.op(r, baseBounds, SkRegion::kIntersect_Op, true);
         r.offset(-2*dx[i], 0);
         rc2.op(r, baseBounds, SkRegion::kIntersect_Op, true);

         REPORTER_ASSERT(reporter, changed != (rc0 == rc1));
         REPORTER_ASSERT(reporter, changed != (rc0 == rc2));
     }
 }

 static void test_nearly_integral(skiatest::Reporter* reporter) {
     // All of these should generate equivalent rasterclips

     static const SkScalar gSafeX[] = {
         0, SK_Scalar1/1000, SK_Scalar1/100, SK_Scalar1/10,
     };
     did_dx_affect(reporter, gSafeX, SK_ARRAY_COUNT(gSafeX), false);

     static const SkScalar gUnsafeX[] = {
         SK_Scalar1/4, SK_Scalar1/3,
     };
     did_dx_affect(reporter, gUnsafeX, SK_ARRAY_COUNT(gUnsafeX), true);
 }

 static void test_regressions() {
     // these should not assert in the debug build
     // bug was introduced in rev. 3209
     {
         SkAAClip clip;
         SkRect r;
         r.fLeft = 129.892181f;
         r.fTop = 10.3999996f;
         r.fRight = 130.892181f;
         r.fBottom = 20.3999996f;
         clip.setRect(r, true);
     }
 }

 // Building aaclip meant aa-scan-convert a path into a huge clip.
 // the old algorithm sized the supersampler to the size of the clip, which overflowed
 // its internal 16bit coordinates. The fix was to intersect the clip+path_bounds before
 // sizing the supersampler.
 //
 // Before the fix, the following code would assert in debug builds.
 //
 static void test_crbug_422693(skiatest::Reporter* reporter) {
     SkRasterClip rc(SkIRect::MakeLTRB(-25000, -25000, 25000, 25000));
     SkPath path;
     path.addCircle(50, 50, 50);
     rc.op(path, rc.getBounds(), SkRegion::kIntersect_Op, true);
 }

 DEF_TEST(AAClip, reporter) {
     test_empty(reporter);
     test_path_bounds(reporter);
     test_irect(reporter);
     test_rgn(reporter);
     test_path_with_hole(reporter);
     test_regressions();
     test_nearly_integral(reporter);
     test_really_a_rect(reporter);
     test_crbug_422693(reporter);
 }
	/*
	* 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 "SkAAClip.h"
	#include "SkCanvas.h"
	#include "SkMask.h"
	#include "SkPath.h"
	#include "SkRandom.h"
	#include "SkRRect.h"
	#include "Test.h"

	static bool operator==(const SkMask& a, const SkMask& b) {
	if (a.fFormat != b.fFormat \|\| a.fBounds != b.fBounds) {
	return false;
	}
	if (!a.fImage && !b.fImage) {
	return true;
	}
	if (!a.fImage \|\| !b.fImage) {
	return false;
	}

	size_t wbytes = a.fBounds.width();
	switch (a.fFormat) {
	case SkMask::kBW_Format:
	wbytes = (wbytes + 7) >> 3;
	break;
	case SkMask::kA8_Format:
	case SkMask::k3D_Format:
	break;
	case SkMask::kLCD16_Format:
	wbytes <<= 1;
	break;
	case SkMask::kARGB32_Format:
	wbytes <<= 2;
	break;
	default:
	SkDEBUGFAIL("unknown mask format");
	return false;
	}

	const int h = a.fBounds.height();
	const char* aptr = (const char*)a.fImage;
	const char* bptr = (const char*)b.fImage;
	for (int y = 0; y < h; ++y) {
	if (memcmp(aptr, bptr, wbytes)) {
	return false;
	}
	aptr += wbytes;
	bptr += wbytes;
	}
	return true;
	}

	static void copyToMask(const SkRegion& rgn, SkMask* mask) {
	mask->fFormat = SkMask::kA8_Format;

	if (rgn.isEmpty()) {
	mask->fBounds.setEmpty();
	mask->fRowBytes = 0;
	mask->fImage = nullptr;
	return;
	}

	mask->fBounds = rgn.getBounds();
	mask->fRowBytes = mask->fBounds.width();
	mask->fImage = SkMask::AllocImage(mask->computeImageSize());
	sk_bzero(mask->fImage, mask->computeImageSize());

	SkImageInfo info = SkImageInfo::Make(mask->fBounds.width(),
	mask->fBounds.height(),
	kAlpha_8_SkColorType,
	kPremul_SkAlphaType);
	SkBitmap bitmap;
	bitmap.installPixels(info, mask->fImage, mask->fRowBytes);

	// canvas expects its coordinate system to always be 0,0 in the top/left
	// so we translate the rgn to match that before drawing into the mask.
	//
	SkRegion tmpRgn(rgn);
	tmpRgn.translate(-rgn.getBounds().fLeft, -rgn.getBounds().fTop);

	SkCanvas canvas(bitmap);
	canvas.clipRegion(tmpRgn);
	canvas.drawColor(SK_ColorBLACK);
	}

	static SkIRect rand_rect(SkRandom& rand, int n) {
	int x = rand.nextS() % n;
	int y = rand.nextS() % n;
	int w = rand.nextU() % n;
	int h = rand.nextU() % n;
	return SkIRect::MakeXYWH(x, y, w, h);
	}

	static void make_rand_rgn(SkRegion* rgn, SkRandom& rand) {
	int count = rand.nextU() % 20;
	for (int i = 0; i < count; ++i) {
	rgn->op(rand_rect(rand, 100), SkRegion::kXOR_Op);
	}
	}

	static bool operator==(const SkRegion& rgn, const SkAAClip& aaclip) {
	SkMask mask0, mask1;

	copyToMask(rgn, &mask0);
	aaclip.copyToMask(&mask1);
	bool eq = (mask0 == mask1);

	SkMask::FreeImage(mask0.fImage);
	SkMask::FreeImage(mask1.fImage);
	return eq;
	}

	static bool equalsAAClip(const SkRegion& rgn) {
	SkAAClip aaclip;
	aaclip.setRegion(rgn);
	return rgn == aaclip;
	}

	static void setRgnToPath(SkRegion* rgn, const SkPath& path) {
	SkIRect ir;
	path.getBounds().round(&ir);
	rgn->setPath(path, SkRegion(ir));
	}

	// aaclip.setRegion should create idential masks to the region
	static void test_rgn(skiatest::Reporter* reporter) {
	SkRandom rand;
	for (int i = 0; i < 1000; i++) {
	SkRegion rgn;
	make_rand_rgn(&rgn, rand);
	REPORTER_ASSERT(reporter, equalsAAClip(rgn));
	}

	{
	SkRegion rgn;
	SkPath path;
	path.addCircle(0, 0, SkIntToScalar(30));
	setRgnToPath(&rgn, path);
	REPORTER_ASSERT(reporter, equalsAAClip(rgn));

	path.reset();
	path.moveTo(0, 0);
	path.lineTo(SkIntToScalar(100), 0);
	path.lineTo(SkIntToScalar(100 - 20), SkIntToScalar(20));
	path.lineTo(SkIntToScalar(20), SkIntToScalar(20));
	setRgnToPath(&rgn, path);
	REPORTER_ASSERT(reporter, equalsAAClip(rgn));
	}
	}

	static const SkRegion::Op gRgnOps[] = {
	SkRegion::kDifference_Op,
	SkRegion::kIntersect_Op,
	SkRegion::kUnion_Op,
	SkRegion::kXOR_Op,
	SkRegion::kReverseDifference_Op,
	SkRegion::kReplace_Op
	};

	static const char* gRgnOpNames[] = {
	"DIFF", "INTERSECT", "UNION", "XOR", "REVERSE_DIFF", "REPLACE"
	};

	static void imoveTo(SkPath& path, int x, int y) {
	path.moveTo(SkIntToScalar(x), SkIntToScalar(y));
	}

	static void icubicTo(SkPath& path, int x0, int y0, int x1, int y1, int x2, int y2) {
	path.cubicTo(SkIntToScalar(x0), SkIntToScalar(y0),
	SkIntToScalar(x1), SkIntToScalar(y1),
	SkIntToScalar(x2), SkIntToScalar(y2));
	}

	static void test_path_bounds(skiatest::Reporter* reporter) {
	SkPath path;
	SkAAClip clip;
	const int height = 40;
	const SkScalar sheight = SkIntToScalar(height);

	path.addOval(SkRect::MakeWH(sheight, sheight));
	REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
	clip.setPath(path, nullptr, true);
	REPORTER_ASSERT(reporter, height == clip.getBounds().height());

	// this is the trimmed height of this cubic (with aa). The critical thing
	// for this test is that it is less than height, which represents just
	// the bounds of the path's control-points.
	//
	// This used to fail until we tracked the MinY in the BuilderBlitter.
	//
	const int teardrop_height = 12;
	path.reset();
	imoveTo(path, 0, 20);
	icubicTo(path, 40, 40, 40, 0, 0, 20);
	REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
	clip.setPath(path, nullptr, true);
	REPORTER_ASSERT(reporter, teardrop_height == clip.getBounds().height());
	}

	static void test_empty(skiatest::Reporter* reporter) {
	SkAAClip clip0, clip1;

	REPORTER_ASSERT(reporter, clip0.isEmpty());
	REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
	REPORTER_ASSERT(reporter, clip1 == clip0);

	clip0.translate(10, 10); // should have no effect on empty
	REPORTER_ASSERT(reporter, clip0.isEmpty());
	REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
	REPORTER_ASSERT(reporter, clip1 == clip0);

	SkIRect r = { 10, 10, 40, 50 };
	clip0.setRect(r);
	REPORTER_ASSERT(reporter, !clip0.isEmpty());
	REPORTER_ASSERT(reporter, !clip0.getBounds().isEmpty());
	REPORTER_ASSERT(reporter, clip0 != clip1);
	REPORTER_ASSERT(reporter, clip0.getBounds() == r);

	clip0.setEmpty();
	REPORTER_ASSERT(reporter, clip0.isEmpty());
	REPORTER_ASSERT(reporter, clip0.getBounds().isEmpty());
	REPORTER_ASSERT(reporter, clip1 == clip0);

	SkMask mask;
	clip0.copyToMask(&mask);
	REPORTER_ASSERT(reporter, nullptr == mask.fImage);
	REPORTER_ASSERT(reporter, mask.fBounds.isEmpty());
	}

	static void rand_irect(SkIRect* r, int N, SkRandom& rand) {
	r->setXYWH(0, 0, rand.nextU() % N, rand.nextU() % N);
	int dx = rand.nextU() % (2*N);
	int dy = rand.nextU() % (2*N);
	// use int dx,dy to make the subtract be signed
	r->offset(N - dx, N - dy);
	}

	static void test_irect(skiatest::Reporter* reporter) {
	SkRandom rand;

	for (int i = 0; i < 10000; i++) {
	SkAAClip clip0, clip1;
	SkRegion rgn0, rgn1;
	SkIRect r0, r1;

	rand_irect(&r0, 10, rand);
	rand_irect(&r1, 10, rand);
	clip0.setRect(r0);
	clip1.setRect(r1);
	rgn0.setRect(r0);
	rgn1.setRect(r1);
	for (size_t j = 0; j < SK_ARRAY_COUNT(gRgnOps); ++j) {
	SkRegion::Op op = gRgnOps[j];
	SkAAClip clip2;
	SkRegion rgn2;
	bool nonEmptyAA = clip2.op(clip0, clip1, op);
	bool nonEmptyBW = rgn2.op(rgn0, rgn1, op);
	if (nonEmptyAA != nonEmptyBW \|\| clip2.getBounds() != rgn2.getBounds()) {
	ERRORF(reporter, "%s %s "
	"[%d %d %d %d] %s [%d %d %d %d] = BW:[%d %d %d %d] AA:[%d %d %d %d]\n",
	nonEmptyAA == nonEmptyBW ? "true" : "false",
	clip2.getBounds() == rgn2.getBounds() ? "true" : "false",
	r0.fLeft, r0.fTop, r0.right(), r0.bottom(),
	gRgnOpNames[j],
	r1.fLeft, r1.fTop, r1.right(), r1.bottom(),
	rgn2.getBounds().fLeft, rgn2.getBounds().fTop,
	rgn2.getBounds().right(), rgn2.getBounds().bottom(),
	clip2.getBounds().fLeft, clip2.getBounds().fTop,
	clip2.getBounds().right(), clip2.getBounds().bottom());
	}

	SkMask maskBW, maskAA;
	copyToMask(rgn2, &maskBW);
	clip2.copyToMask(&maskAA);
	SkAutoMaskFreeImage freeBW(maskBW.fImage);
	SkAutoMaskFreeImage freeAA(maskAA.fImage);
	REPORTER_ASSERT(reporter, maskBW == maskAA);
	}
	}
	}

	static void test_path_with_hole(skiatest::Reporter* reporter) {
	static const uint8_t gExpectedImage[] = {
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0xFF, 0xFF, 0xFF, 0xFF,
	0xFF, 0xFF, 0xFF, 0xFF,
	};
	SkMask expected;
	expected.fBounds.set(0, 0, 4, 6);
	expected.fRowBytes = 4;
	expected.fFormat = SkMask::kA8_Format;
	expected.fImage = (uint8_t*)gExpectedImage;

	SkPath path;
	path.addRect(SkRect::MakeXYWH(0, 0,
	SkIntToScalar(4), SkIntToScalar(2)));
	path.addRect(SkRect::MakeXYWH(0, SkIntToScalar(4),
	SkIntToScalar(4), SkIntToScalar(2)));

	for (int i = 0; i < 2; ++i) {
	SkAAClip clip;
	clip.setPath(path, nullptr, 1 == i);

	SkMask mask;
	clip.copyToMask(&mask);
	SkAutoMaskFreeImage freeM(mask.fImage);

	REPORTER_ASSERT(reporter, expected == mask);
	}
	}

	static void test_really_a_rect(skiatest::Reporter* reporter) {
	SkRRect rrect;
	rrect.setRectXY(SkRect::MakeWH(100, 100), 5, 5);

	SkPath path;
	path.addRRect(rrect);

	SkAAClip clip;
	clip.setPath(path);

	REPORTER_ASSERT(reporter, clip.getBounds() == SkIRect::MakeWH(100, 100));
	REPORTER_ASSERT(reporter, !clip.isRect());

	// This rect should intersect the clip, but slice-out all of the "soft" parts,
	// leaving just a rect.
	const SkIRect ir = SkIRect::MakeLTRB(10, -10, 50, 90);

	clip.op(ir, SkRegion::kIntersect_Op);

	REPORTER_ASSERT(reporter, clip.getBounds() == SkIRect::MakeLTRB(10, 0, 50, 90));
	// the clip recognized that that it is just a rect!
	REPORTER_ASSERT(reporter, clip.isRect());
	}

	#include "SkRasterClip.h"

	static void copyToMask(const SkRasterClip& rc, SkMask* mask) {
	if (rc.isAA()) {
	rc.aaRgn().copyToMask(mask);
	} else {
	copyToMask(rc.bwRgn(), mask);
	}
	}

	static bool operator==(const SkRasterClip& a, const SkRasterClip& b) {
	if (a.isEmpty()) {
	return b.isEmpty();
	}
	if (b.isEmpty()) {
	return false;
	}

	SkMask ma, mb;
	copyToMask(a, &ma);
	copyToMask(b, &mb);
	SkAutoMaskFreeImage aCleanUp(ma.fImage);
	SkAutoMaskFreeImage bCleanUp(mb.fImage);

	return ma == mb;
	}

	static void did_dx_affect(skiatest::Reporter* reporter, const SkScalar dx[],
	size_t count, bool changed) {
	const SkIRect baseBounds = SkIRect::MakeXYWH(0, 0, 10, 10);
	SkIRect ir = { 0, 0, 10, 10 };

	for (size_t i = 0; i < count; ++i) {
	SkRect r;
	r.set(ir);

	SkRasterClip rc0(ir);
	SkRasterClip rc1(ir);
	SkRasterClip rc2(ir);

	rc0.op(r, baseBounds, SkRegion::kIntersect_Op, false);
	r.offset(dx[i], 0);
	rc1.op(r, baseBounds, SkRegion::kIntersect_Op, true);
	r.offset(-2*dx[i], 0);
	rc2.op(r, baseBounds, SkRegion::kIntersect_Op, true);

	REPORTER_ASSERT(reporter, changed != (rc0 == rc1));
	REPORTER_ASSERT(reporter, changed != (rc0 == rc2));
	}
	}

	static void test_nearly_integral(skiatest::Reporter* reporter) {
	// All of these should generate equivalent rasterclips

	static const SkScalar gSafeX[] = {
	0, SK_Scalar1/1000, SK_Scalar1/100, SK_Scalar1/10,
	};
	did_dx_affect(reporter, gSafeX, SK_ARRAY_COUNT(gSafeX), false);

	static const SkScalar gUnsafeX[] = {
	SK_Scalar1/4, SK_Scalar1/3,
	};
	did_dx_affect(reporter, gUnsafeX, SK_ARRAY_COUNT(gUnsafeX), true);
	}

	static void test_regressions() {
	// these should not assert in the debug build
	// bug was introduced in rev. 3209
	{
	SkAAClip clip;
	SkRect r;
	r.fLeft = 129.892181f;
	r.fTop = 10.3999996f;
	r.fRight = 130.892181f;
	r.fBottom = 20.3999996f;
	clip.setRect(r, true);
	}
	}

	// Building aaclip meant aa-scan-convert a path into a huge clip.
	// the old algorithm sized the supersampler to the size of the clip, which overflowed
	// its internal 16bit coordinates. The fix was to intersect the clip+path_bounds before
	// sizing the supersampler.
	//
	// Before the fix, the following code would assert in debug builds.
	//
	static void test_crbug_422693(skiatest::Reporter* reporter) {
	SkRasterClip rc(SkIRect::MakeLTRB(-25000, -25000, 25000, 25000));
	SkPath path;
	path.addCircle(50, 50, 50);
	rc.op(path, rc.getBounds(), SkRegion::kIntersect_Op, true);
	}

	DEF_TEST(AAClip, reporter) {
	test_empty(reporter);
	test_path_bounds(reporter);
	test_irect(reporter);
	test_rgn(reporter);
	test_path_with_hole(reporter);
	test_regressions();
	test_nearly_integral(reporter);
	test_really_a_rect(reporter);
	test_crbug_422693(reporter);
	}