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

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "CanvasStateHelpers.h"
 #include "SkCanvas.h"
 #include "SkCanvasStateUtils.h"
 #include "SkCommandLineFlags.h"
 #include "SkDrawFilter.h"
 #include "SkError.h"
 #include "SkPaint.h"
 #include "SkRRect.h"
 #include "SkRect.h"
 #include "SkTLazy.h"
 #include "Test.h"

 // dlopen and the library flag are only used for tests which require this flag.
 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
 #include <dlfcn.h>

 DEFINE_string(library, "", "Support library to use for CanvasState test. If empty (the default), "
                            "the test will be run without crossing a library boundary. Otherwise, "
                            "it is expected to be a full path to a shared library file, which will"
                            " be dynamically loaded. Functions from the library will be called to "
                            "test SkCanvasState. Instructions for generating the library are in "
                            "gyp/canvas_state_lib.gyp");


 // This class calls dlopen on the library passed in to the command line flag library, and handles
 // calling dlclose when it goes out of scope.
 class OpenLibResult {
 public:
     // If the flag library was passed to this run of the test, attempt to open it using dlopen and
     // report whether it succeeded.
     OpenLibResult(skiatest::Reporter* reporter) {
         if (FLAGS_library.count() == 1) {
             fHandle = dlopen(FLAGS_library[0], RTLD_LAZY | RTLD_LOCAL);
             REPORTER_ASSERT_MESSAGE(reporter, fHandle != nullptr, "Failed to open library!");
         } else {
             fHandle = nullptr;
         }
     }

     // Automatically call dlclose when going out of scope.
     ~OpenLibResult() {
         if (fHandle) {
             dlclose(fHandle);
         }
     }

     // Pointer to the shared library object.
     void* handle() { return fHandle; }

 private:
     void* fHandle;
 };

 DEF_TEST(CanvasState_test_complex_layers, reporter) {
     const int WIDTH = 400;
     const int HEIGHT = 400;
     const int SPACER = 10;

     SkRect rect = SkRect::MakeXYWH(SkIntToScalar(SPACER), SkIntToScalar(SPACER),
                                    SkIntToScalar(WIDTH-(2*SPACER)),
                                    SkIntToScalar((HEIGHT-(2*SPACER)) / 7));

     const SkColorType colorTypes[] = {
         kRGB_565_SkColorType, kN32_SkColorType
     };

     const int layerAlpha[] = { 255, 255, 0 };
     const SkCanvas::SaveLayerFlags flags[] = {
         static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
         0,
         static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
     };
     REPORTER_ASSERT(reporter, sizeof(layerAlpha) == sizeof(flags));

     bool (*drawFn)(SkCanvasState* state, float l, float t,
                    float r, float b, int32_t s);

     OpenLibResult openLibResult(reporter);
     if (openLibResult.handle() != nullptr) {
         *(void**) (&drawFn) = dlsym(openLibResult.handle(),
                                     "complex_layers_draw_from_canvas_state");
     } else {
         drawFn = complex_layers_draw_from_canvas_state;
     }

     REPORTER_ASSERT(reporter, drawFn);
     if (!drawFn) {
         return;
     }

     for (size_t i = 0; i < SK_ARRAY_COUNT(colorTypes); ++i) {
         SkBitmap bitmaps[2];
         for (int j = 0; j < 2; ++j) {
             bitmaps[j].allocPixels(SkImageInfo::Make(WIDTH, HEIGHT,
                                                      colorTypes[i],
                                                      kPremul_SkAlphaType));

             SkCanvas canvas(bitmaps[j]);

             canvas.drawColor(SK_ColorRED);

             for (size_t k = 0; k < SK_ARRAY_COUNT(layerAlpha); ++k) {
                 SkTLazy<SkPaint> paint;
                 if (layerAlpha[k] != 0xFF) {
                     paint.init()->setAlpha(layerAlpha[k]);
                 }

                 // draw a rect within the layer's bounds and again outside the layer's bounds
                 canvas.saveLayer(SkCanvas::SaveLayerRec(&rect, paint.getMaybeNull(), flags[k]));

                 if (j) {
                     // Capture from the first Skia.
                     SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
                     REPORTER_ASSERT(reporter, state);

                     // And draw to it in the second Skia.
                     bool success = complex_layers_draw_from_canvas_state(state,
                             rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, SPACER);
                     REPORTER_ASSERT(reporter, success);

                     // And release it in the *first* Skia.
                     SkCanvasStateUtils::ReleaseCanvasState(state);
                 } else {
                     // Draw in the first Skia.
                     complex_layers_draw(&canvas, rect.fLeft, rect.fTop,
                                         rect.fRight, rect.fBottom, SPACER);
                 }

                 canvas.restore();

                 // translate the canvas for the next iteration
                 canvas.translate(0, 2*(rect.height() + SPACER));
             }
         }

         // now we memcmp the two bitmaps
         REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
         REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
                                           bitmaps[1].getPixels(),
                                           bitmaps[0].getSize()));
     }
 }
 #endif

 ////////////////////////////////////////////////////////////////////////////////

 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
 DEF_TEST(CanvasState_test_complex_clips, reporter) {
     const int WIDTH = 400;
     const int HEIGHT = 400;
     const int SPACER = 10;

     SkIRect layerRect = SkIRect::MakeWH(WIDTH, HEIGHT / 4);
     layerRect.inset(2*SPACER, 2*SPACER);

     SkIRect clipRect = layerRect;
     clipRect.fRight = clipRect.fLeft + (clipRect.width() / 2) - (2*SPACER);
     clipRect.outset(SPACER, SPACER);

     SkIRect regionBounds = clipRect;
     regionBounds.offset(clipRect.width() + (2*SPACER), 0);

     SkIRect regionInterior = regionBounds;
     regionInterior.inset(SPACER*3, SPACER*3);

     SkRegion clipRegion;
     clipRegion.setRect(regionBounds);
     clipRegion.op(regionInterior, SkRegion::kDifference_Op);


     const SkRegion::Op clipOps[] = { SkRegion::kIntersect_Op,
                                      SkRegion::kIntersect_Op,
                                      SkRegion::kReplace_Op,
     };
     const SkCanvas::SaveLayerFlags flags[] = {
         static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
         0,
         static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
     };
     REPORTER_ASSERT(reporter, sizeof(clipOps) == sizeof(flags));

     bool (*drawFn)(SkCanvasState* state, int32_t l, int32_t t,
                    int32_t r, int32_t b, int32_t clipOp,
                    int32_t regionRects, int32_t* rectCoords);

     OpenLibResult openLibResult(reporter);
     if (openLibResult.handle() != nullptr) {
         *(void**) (&drawFn) = dlsym(openLibResult.handle(),
                                     "complex_clips_draw_from_canvas_state");
     } else {
         drawFn = complex_clips_draw_from_canvas_state;
     }

     REPORTER_ASSERT(reporter, drawFn);
     if (!drawFn) {
         return;
     }

     SkBitmap bitmaps[2];
     for (int i = 0; i < 2; ++i) {
         bitmaps[i].allocN32Pixels(WIDTH, HEIGHT);

         SkCanvas canvas(bitmaps[i]);

         canvas.drawColor(SK_ColorRED);

         SkRegion localRegion = clipRegion;

         SkPaint paint;
         paint.setAlpha(128);
         for (size_t j = 0; j < SK_ARRAY_COUNT(flags); ++j) {
             SkRect layerBounds = SkRect::Make(layerRect);
             canvas.saveLayer(SkCanvas::SaveLayerRec(&layerBounds, &paint, flags[j]));

             if (i) {
                 SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
                 REPORTER_ASSERT(reporter, state);

                 SkRegion::Iterator iter(localRegion);
                 SkTDArray<int32_t> rectCoords;
                 for (; !iter.done(); iter.next()) {
                     const SkIRect& rect = iter.rect();
                     *rectCoords.append() = rect.fLeft;
                     *rectCoords.append() = rect.fTop;
                     *rectCoords.append() = rect.fRight;
                     *rectCoords.append() = rect.fBottom;
                 }
                 bool success = drawFn(state, clipRect.fLeft, clipRect.fTop,
                                       clipRect.fRight, clipRect.fBottom, clipOps[j],
                                       rectCoords.count() / 4, rectCoords.begin());
                 REPORTER_ASSERT(reporter, success);

                 SkCanvasStateUtils::ReleaseCanvasState(state);
             } else {
                 complex_clips_draw(&canvas, clipRect.fLeft, clipRect.fTop,
                                    clipRect.fRight, clipRect.fBottom, clipOps[j],
                                    localRegion);
             }

             canvas.restore();

             // translate the canvas and region for the next iteration
             canvas.translate(0, SkIntToScalar(2*(layerRect.height() + (SPACER))));
             localRegion.translate(0, 2*(layerRect.height() + SPACER));
         }
     }

     // now we memcmp the two bitmaps
     REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
     REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
                                       bitmaps[1].getPixels(),
                                       bitmaps[0].getSize()));
 }
 #endif

 ////////////////////////////////////////////////////////////////////////////////

 #ifdef SK_SUPPORT_LEGACY_DRAWFILTER

 class TestDrawFilter : public SkDrawFilter {
 public:
     bool filter(SkPaint*, Type) override { return true; }
 };

 DEF_TEST(CanvasState_test_draw_filters, reporter) {
     TestDrawFilter drawFilter;
     SkBitmap bitmap;
     bitmap.allocN32Pixels(10, 10);
     SkCanvas canvas(bitmap);

     canvas.setDrawFilter(&drawFilter);

     SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
     REPORTER_ASSERT(reporter, state);
     SkCanvas* tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
     REPORTER_ASSERT(reporter, tmpCanvas);

     REPORTER_ASSERT(reporter, canvas.getDrawFilter());
     REPORTER_ASSERT(reporter, nullptr == tmpCanvas->getDrawFilter());

     tmpCanvas->unref();
     SkCanvasStateUtils::ReleaseCanvasState(state);
 }

 #endif

 ////////////////////////////////////////////////////////////////////////////////

 // we need this function to prevent SkError from printing to stdout
 static void error_callback(SkError code, void* ctx) {}

 DEF_TEST(CanvasState_test_soft_clips, reporter) {
     SkBitmap bitmap;
     bitmap.allocN32Pixels(10, 10);
     SkCanvas canvas(bitmap);

     SkRRect roundRect;
     roundRect.setOval(SkRect::MakeWH(5, 5));

     canvas.clipRRect(roundRect, SkCanvas::kIntersect_Op, true);

     SkSetErrorCallback(error_callback, nullptr);

     SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
     REPORTER_ASSERT(reporter, !state);

     REPORTER_ASSERT(reporter, kInvalidOperation_SkError == SkGetLastError());
     SkClearLastError();
 }

 #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
 #include "SkClipStack.h"
 DEF_TEST(CanvasState_test_saveLayer_clip, reporter) {
     const int WIDTH = 100;
     const int HEIGHT = 100;
     const int LAYER_WIDTH = 50;
     const int LAYER_HEIGHT = 50;

     SkBitmap bitmap;
     bitmap.allocN32Pixels(WIDTH, HEIGHT);
     SkCanvas canvas(bitmap);

     SkRect bounds = SkRect::MakeWH(SkIntToScalar(LAYER_WIDTH), SkIntToScalar(LAYER_HEIGHT));
     canvas.clipRect(SkRect::MakeWH(SkIntToScalar(WIDTH), SkIntToScalar(HEIGHT)));

     // Check that saveLayer without the kClipToLayer_SaveFlag leaves the
     // clip stack unchanged.
     canvas.saveLayer(SkCanvas::SaveLayerRec(&bounds,
                                             nullptr,
                                             SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag));
     SkRect clipStackBounds;
     SkClipStack::BoundsType boundsType;
     canvas.getClipStack()->getBounds(&clipStackBounds, &boundsType);
     // The clip stack will return its bounds, or it may be "full" : i.e. empty + inside_out.
     // Either result is consistent with this test, since the canvas' size is WIDTH/HEIGHT
     if (SkClipStack::kInsideOut_BoundsType == boundsType) {
         REPORTER_ASSERT(reporter, clipStackBounds.isEmpty());
     } else {
         REPORTER_ASSERT(reporter, clipStackBounds.width() == WIDTH);
         REPORTER_ASSERT(reporter, clipStackBounds.height() == HEIGHT);
     }
     canvas.restore();

     // Check that saveLayer with the kClipToLayer_SaveFlag sets the clip
     // stack to the layer bounds.
     canvas.saveLayer(&bounds, nullptr);
     canvas.getClipStack()->getBounds(&clipStackBounds, &boundsType);
     REPORTER_ASSERT(reporter, clipStackBounds.width() == LAYER_WIDTH);
     REPORTER_ASSERT(reporter, clipStackBounds.height() == LAYER_HEIGHT);

     canvas.restore();
 }
 #endif
	/*
	* Copyright 2013 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "CanvasStateHelpers.h"
	#include "SkCanvas.h"
	#include "SkCanvasStateUtils.h"
	#include "SkCommandLineFlags.h"
	#include "SkDrawFilter.h"
	#include "SkError.h"
	#include "SkPaint.h"
	#include "SkRRect.h"
	#include "SkRect.h"
	#include "SkTLazy.h"
	#include "Test.h"

	// dlopen and the library flag are only used for tests which require this flag.
	#ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
	#include <dlfcn.h>

	DEFINE_string(library, "", "Support library to use for CanvasState test. If empty (the default), "
	"the test will be run without crossing a library boundary. Otherwise, "
	"it is expected to be a full path to a shared library file, which will"
	" be dynamically loaded. Functions from the library will be called to "
	"test SkCanvasState. Instructions for generating the library are in "
	"gyp/canvas_state_lib.gyp");


	// This class calls dlopen on the library passed in to the command line flag library, and handles
	// calling dlclose when it goes out of scope.
	class OpenLibResult {
	public:
	// If the flag library was passed to this run of the test, attempt to open it using dlopen and
	// report whether it succeeded.
	OpenLibResult(skiatest::Reporter* reporter) {
	if (FLAGS_library.count() == 1) {
	fHandle = dlopen(FLAGS_library[0], RTLD_LAZY \| RTLD_LOCAL);
	REPORTER_ASSERT_MESSAGE(reporter, fHandle != nullptr, "Failed to open library!");
	} else {
	fHandle = nullptr;
	}
	}

	// Automatically call dlclose when going out of scope.
	~OpenLibResult() {
	if (fHandle) {
	dlclose(fHandle);
	}
	}

	// Pointer to the shared library object.
	void* handle() { return fHandle; }

	private:
	void* fHandle;
	};

	DEF_TEST(CanvasState_test_complex_layers, reporter) {
	const int WIDTH = 400;
	const int HEIGHT = 400;
	const int SPACER = 10;

	SkRect rect = SkRect::MakeXYWH(SkIntToScalar(SPACER), SkIntToScalar(SPACER),
	SkIntToScalar(WIDTH-(2*SPACER)),
	SkIntToScalar((HEIGHT-(2*SPACER)) / 7));

	const SkColorType colorTypes[] = {
	kRGB_565_SkColorType, kN32_SkColorType
	};

	const int layerAlpha[] = { 255, 255, 0 };
	const SkCanvas::SaveLayerFlags flags[] = {
	static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
	0,
	static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
	};
	REPORTER_ASSERT(reporter, sizeof(layerAlpha) == sizeof(flags));

	bool (drawFn)(SkCanvasState state, float l, float t,
	float r, float b, int32_t s);

	OpenLibResult openLibResult(reporter);
	if (openLibResult.handle() != nullptr) {
	(void*) (&drawFn) = dlsym(openLibResult.handle(),
	"complex_layers_draw_from_canvas_state");
	} else {
	drawFn = complex_layers_draw_from_canvas_state;
	}

	REPORTER_ASSERT(reporter, drawFn);
	if (!drawFn) {
	return;
	}

	for (size_t i = 0; i < SK_ARRAY_COUNT(colorTypes); ++i) {
	SkBitmap bitmaps[2];
	for (int j = 0; j < 2; ++j) {
	bitmaps[j].allocPixels(SkImageInfo::Make(WIDTH, HEIGHT,
	colorTypes[i],
	kPremul_SkAlphaType));

	SkCanvas canvas(bitmaps[j]);

	canvas.drawColor(SK_ColorRED);

	for (size_t k = 0; k < SK_ARRAY_COUNT(layerAlpha); ++k) {
	SkTLazy<SkPaint> paint;
	if (layerAlpha[k] != 0xFF) {
	paint.init()->setAlpha(layerAlpha[k]);
	}

	// draw a rect within the layer's bounds and again outside the layer's bounds
	canvas.saveLayer(SkCanvas::SaveLayerRec(&rect, paint.getMaybeNull(), flags[k]));

	if (j) {
	// Capture from the first Skia.
	SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
	REPORTER_ASSERT(reporter, state);

	// And draw to it in the second Skia.
	bool success = complex_layers_draw_from_canvas_state(state,
	rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, SPACER);
	REPORTER_ASSERT(reporter, success);

	// And release it in the first Skia.
	SkCanvasStateUtils::ReleaseCanvasState(state);
	} else {
	// Draw in the first Skia.
	complex_layers_draw(&canvas, rect.fLeft, rect.fTop,
	rect.fRight, rect.fBottom, SPACER);
	}

	canvas.restore();

	// translate the canvas for the next iteration
	canvas.translate(0, 2*(rect.height() + SPACER));
	}
	}

	// now we memcmp the two bitmaps
	REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
	REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
	bitmaps[1].getPixels(),
	bitmaps[0].getSize()));
	}
	}
	#endif

	////////////////////////////////////////////////////////////////////////////////

	#ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
	DEF_TEST(CanvasState_test_complex_clips, reporter) {
	const int WIDTH = 400;
	const int HEIGHT = 400;
	const int SPACER = 10;

	SkIRect layerRect = SkIRect::MakeWH(WIDTH, HEIGHT / 4);
	layerRect.inset(2SPACER, 2SPACER);

	SkIRect clipRect = layerRect;
	clipRect.fRight = clipRect.fLeft + (clipRect.width() / 2) - (2*SPACER);
	clipRect.outset(SPACER, SPACER);

	SkIRect regionBounds = clipRect;
	regionBounds.offset(clipRect.width() + (2*SPACER), 0);

	SkIRect regionInterior = regionBounds;
	regionInterior.inset(SPACER3, SPACER3);

	SkRegion clipRegion;
	clipRegion.setRect(regionBounds);
	clipRegion.op(regionInterior, SkRegion::kDifference_Op);


	const SkRegion::Op clipOps[] = { SkRegion::kIntersect_Op,
	SkRegion::kIntersect_Op,
	SkRegion::kReplace_Op,
	};
	const SkCanvas::SaveLayerFlags flags[] = {
	static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
	0,
	static_cast<SkCanvas::SaveLayerFlags>(SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag),
	};
	REPORTER_ASSERT(reporter, sizeof(clipOps) == sizeof(flags));

	bool (drawFn)(SkCanvasState state, int32_t l, int32_t t,
	int32_t r, int32_t b, int32_t clipOp,
	int32_t regionRects, int32_t* rectCoords);

	OpenLibResult openLibResult(reporter);
	if (openLibResult.handle() != nullptr) {
	(void*) (&drawFn) = dlsym(openLibResult.handle(),
	"complex_clips_draw_from_canvas_state");
	} else {
	drawFn = complex_clips_draw_from_canvas_state;
	}

	REPORTER_ASSERT(reporter, drawFn);
	if (!drawFn) {
	return;
	}

	SkBitmap bitmaps[2];
	for (int i = 0; i < 2; ++i) {
	bitmaps[i].allocN32Pixels(WIDTH, HEIGHT);

	SkCanvas canvas(bitmaps[i]);

	canvas.drawColor(SK_ColorRED);

	SkRegion localRegion = clipRegion;

	SkPaint paint;
	paint.setAlpha(128);
	for (size_t j = 0; j < SK_ARRAY_COUNT(flags); ++j) {
	SkRect layerBounds = SkRect::Make(layerRect);
	canvas.saveLayer(SkCanvas::SaveLayerRec(&layerBounds, &paint, flags[j]));

	if (i) {
	SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
	REPORTER_ASSERT(reporter, state);

	SkRegion::Iterator iter(localRegion);
	SkTDArray<int32_t> rectCoords;
	for (; !iter.done(); iter.next()) {
	const SkIRect& rect = iter.rect();
	*rectCoords.append() = rect.fLeft;
	*rectCoords.append() = rect.fTop;
	*rectCoords.append() = rect.fRight;
	*rectCoords.append() = rect.fBottom;
	}
	bool success = drawFn(state, clipRect.fLeft, clipRect.fTop,
	clipRect.fRight, clipRect.fBottom, clipOps[j],
	rectCoords.count() / 4, rectCoords.begin());
	REPORTER_ASSERT(reporter, success);

	SkCanvasStateUtils::ReleaseCanvasState(state);
	} else {
	complex_clips_draw(&canvas, clipRect.fLeft, clipRect.fTop,
	clipRect.fRight, clipRect.fBottom, clipOps[j],
	localRegion);
	}

	canvas.restore();

	// translate the canvas and region for the next iteration
	canvas.translate(0, SkIntToScalar(2*(layerRect.height() + (SPACER))));
	localRegion.translate(0, 2*(layerRect.height() + SPACER));
	}
	}

	// now we memcmp the two bitmaps
	REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
	REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
	bitmaps[1].getPixels(),
	bitmaps[0].getSize()));
	}
	#endif

	////////////////////////////////////////////////////////////////////////////////

	#ifdef SK_SUPPORT_LEGACY_DRAWFILTER

	class TestDrawFilter : public SkDrawFilter {
	public:
	bool filter(SkPaint*, Type) override { return true; }
	};

	DEF_TEST(CanvasState_test_draw_filters, reporter) {
	TestDrawFilter drawFilter;
	SkBitmap bitmap;
	bitmap.allocN32Pixels(10, 10);
	SkCanvas canvas(bitmap);

	canvas.setDrawFilter(&drawFilter);

	SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
	REPORTER_ASSERT(reporter, state);
	SkCanvas* tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
	REPORTER_ASSERT(reporter, tmpCanvas);

	REPORTER_ASSERT(reporter, canvas.getDrawFilter());
	REPORTER_ASSERT(reporter, nullptr == tmpCanvas->getDrawFilter());

	tmpCanvas->unref();
	SkCanvasStateUtils::ReleaseCanvasState(state);
	}

	#endif

	////////////////////////////////////////////////////////////////////////////////

	// we need this function to prevent SkError from printing to stdout
	static void error_callback(SkError code, void* ctx) {}

	DEF_TEST(CanvasState_test_soft_clips, reporter) {
	SkBitmap bitmap;
	bitmap.allocN32Pixels(10, 10);
	SkCanvas canvas(bitmap);

	SkRRect roundRect;
	roundRect.setOval(SkRect::MakeWH(5, 5));

	canvas.clipRRect(roundRect, SkCanvas::kIntersect_Op, true);

	SkSetErrorCallback(error_callback, nullptr);

	SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
	REPORTER_ASSERT(reporter, !state);

	REPORTER_ASSERT(reporter, kInvalidOperation_SkError == SkGetLastError());
	SkClearLastError();
	}

	#ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
	#include "SkClipStack.h"
	DEF_TEST(CanvasState_test_saveLayer_clip, reporter) {
	const int WIDTH = 100;
	const int HEIGHT = 100;
	const int LAYER_WIDTH = 50;
	const int LAYER_HEIGHT = 50;

	SkBitmap bitmap;
	bitmap.allocN32Pixels(WIDTH, HEIGHT);
	SkCanvas canvas(bitmap);

	SkRect bounds = SkRect::MakeWH(SkIntToScalar(LAYER_WIDTH), SkIntToScalar(LAYER_HEIGHT));
	canvas.clipRect(SkRect::MakeWH(SkIntToScalar(WIDTH), SkIntToScalar(HEIGHT)));

	// Check that saveLayer without the kClipToLayer_SaveFlag leaves the
	// clip stack unchanged.
	canvas.saveLayer(SkCanvas::SaveLayerRec(&bounds,
	nullptr,
	SkCanvas::kDontClipToLayer_Legacy_SaveLayerFlag));
	SkRect clipStackBounds;
	SkClipStack::BoundsType boundsType;
	canvas.getClipStack()->getBounds(&clipStackBounds, &boundsType);
	// The clip stack will return its bounds, or it may be "full" : i.e. empty + inside_out.
	// Either result is consistent with this test, since the canvas' size is WIDTH/HEIGHT
	if (SkClipStack::kInsideOut_BoundsType == boundsType) {
	REPORTER_ASSERT(reporter, clipStackBounds.isEmpty());
	} else {
	REPORTER_ASSERT(reporter, clipStackBounds.width() == WIDTH);
	REPORTER_ASSERT(reporter, clipStackBounds.height() == HEIGHT);
	}
	canvas.restore();

	// Check that saveLayer with the kClipToLayer_SaveFlag sets the clip
	// stack to the layer bounds.
	canvas.saveLayer(&bounds, nullptr);
	canvas.getClipStack()->getBounds(&clipStackBounds, &boundsType);
	REPORTER_ASSERT(reporter, clipStackBounds.width() == LAYER_WIDTH);
	REPORTER_ASSERT(reporter, clipStackBounds.height() == LAYER_HEIGHT);

	canvas.restore();
	}
	#endif