CanvasTest.cpp File Reference

#include "include/core/SkBitmap.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkClipOp.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkColorType.h"
#include "include/core/SkDocument.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkRegion.h"
#include "include/core/SkSamplingOptions.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkStream.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTypes.h"
#include "include/core/SkVertices.h"
#include "include/effects/SkImageFilters.h"
#include "include/private/base/SkMalloc.h"
#include "include/private/base/SkTemplates.h"
#include "include/utils/SkNWayCanvas.h"
#include "include/utils/SkPaintFilterCanvas.h"
#include "src/core/SkBigPicture.h"
#include "src/core/SkRecord.h"
#include "src/core/SkRecords.h"
#include "src/utils/SkCanvasStack.h"
#include "tests/Test.h"
#include <cstddef>
#include <initializer_list>
#include <memory>
#include <utility>

Go to the source code of this file.

Classes
struct	ClipRectVisitor

Typedefs
using	CanvasTest = void(*)(SkCanvas *, skiatest::Reporter *)

Functions
	DEF_TEST (canvas_unsorted_clip, r)
	DEF_TEST (canvas_clipbounds, reporter)
	DEF_TEST (CanvasNewRasterTest, reporter)
static SkPath	make_path_from_rect (SkRect r)
static SkRegion	make_region_from_irect (SkIRect r)
static SkBitmap	make_n32_bitmap (int w, int h, SkColor c=SK_ColorWHITE)
	DEF_TEST (Canvas_bitmap, reporter)
	DEF_TEST (Canvas_SaveState, reporter)
	DEF_TEST (Canvas_ClipEmptyPath, reporter)
	DEF_TEST (PaintFilterCanvas_ConsistentState, reporter)
	DEF_TEST (NWayCanvas, r)
	DEF_TEST (CanvasStack, r)
static void	test_cliptype (SkCanvas *canvas, skiatest::Reporter *r)
	DEF_TEST (CanvasClipType, r)
	DEF_TEST (Canvas_SaveLayerWithNullBoundsAndZeroBoundsImageFilter, r)
	DEF_TEST (Canvas_degenerate_dimension, reporter)
	DEF_TEST (Canvas_ClippedOutImageFilter, reporter)
	DEF_TEST (canvas_savelayer_destructor, reporter)
	DEF_TEST (Canvas_saveLayer_colorSpace, reporter)
void	test_many_draws (skiatest::Reporter *reporter, SkSurface *surface)

Variables
static constexpr SkRect	kRect = {0, 0, 2, 1}
static constexpr SkColor	kColor = 0x01020304
static constexpr int	kWidth = 2
static constexpr int	kHeight = 2
static CanvasTest	kCanvasTests []

Typedef Documentation

CanvasTest

using CanvasTest = void (*)(SkCanvas*, skiatest::Reporter*)

Definition at line 269 of file CanvasTest.cpp.

Function Documentation

DEF_TEST() [1/15]

DEF_TEST	(	Canvas_bitmap	,
		reporter
	)

Definition at line 409 of file CanvasTest.cpp.

                                  {
    for (const CanvasTest& test : kCanvasTests) {
        SkBitmap referenceStore = make_n32_bitmap(kWidth, kHeight);
        SkCanvas referenceCanvas(referenceStore);
        test(&referenceCanvas, reporter);
    }
}

DEF_TEST() [2/15]

DEF_TEST	(	canvas_clipbounds	,
		reporter
	)

Definition at line 109 of file CanvasTest.cpp.

                                      {
    SkCanvas canvas(10, 10);
    SkIRect irect, irect2;
    SkRect rect, rect2;
 
    irect = canvas.getDeviceClipBounds();
    REPORTER_ASSERT(reporter, irect == SkIRect::MakeWH(10, 10));
    REPORTER_ASSERT(reporter, canvas.getDeviceClipBounds(&irect2));
    REPORTER_ASSERT(reporter, irect == irect2);
 
    // local bounds are always too big today -- can we trim them?
    rect = canvas.getLocalClipBounds();
    REPORTER_ASSERT(reporter, rect.contains(SkRect::MakeWH(10, 10)));
    REPORTER_ASSERT(reporter, canvas.getLocalClipBounds(&rect2));
    REPORTER_ASSERT(reporter, rect == rect2);
 
    canvas.clipRect(SkRect::MakeEmpty());
 
    irect = canvas.getDeviceClipBounds();
    REPORTER_ASSERT(reporter, irect == SkIRect::MakeEmpty());
    REPORTER_ASSERT(reporter, !canvas.getDeviceClipBounds(&irect2));
    REPORTER_ASSERT(reporter, irect == irect2);
 
    rect = canvas.getLocalClipBounds();
    REPORTER_ASSERT(reporter, rect == SkRect::MakeEmpty());
    REPORTER_ASSERT(reporter, !canvas.getLocalClipBounds(&rect2));
    REPORTER_ASSERT(reporter, rect == rect2);
 
    // Test for wacky sizes that we (historically) have guarded against
    {
        SkCanvas c(-10, -20);
        REPORTER_ASSERT(reporter, c.getBaseLayerSize() == SkISize::MakeEmpty());
 
        SkPictureRecorder().beginRecording({ 5, 5, 4, 4 });
    }
}

DEF_TEST() [3/15]

DEF_TEST	(	Canvas_ClipEmptyPath	,
		reporter
	)

Definition at line 449 of file CanvasTest.cpp.

                                         {
    SkCanvas canvas(10, 10);
    canvas.save();
    SkPath path;
    canvas.clipPath(path);
    canvas.restore();
    canvas.save();
    path.moveTo(5, 5);
    canvas.clipPath(path);
    canvas.restore();
    canvas.save();
    path.moveTo(7, 7);
    canvas.clipPath(path);  // should not assert here
    canvas.restore();
}

DEF_TEST() [4/15]

DEF_TEST	(	Canvas_ClippedOutImageFilter	,
		reporter
	)

Definition at line 654 of file CanvasTest.cpp.

                                                 {
    SkCanvas canvas(100, 100);
 
    SkPaint p;
    p.setColor(SK_ColorGREEN);
    p.setImageFilter(SkImageFilters::Blur(3.0f, 3.0f, nullptr, nullptr));
 
    SkRect blurredRect = SkRect::MakeXYWH(60, 10, 30, 30);
 
    SkMatrix invM;
    invM.setRotate(-45);
    invM.mapRect(&blurredRect);
 
    const SkRect clipRect = SkRect::MakeXYWH(0, 50, 50, 50);
 
    canvas.clipRect(clipRect);
 
    canvas.rotate(45);
    const SkMatrix preCTM = canvas.getTotalMatrix();
    canvas.drawRect(blurredRect, p);
    const SkMatrix postCTM = canvas.getTotalMatrix();
    REPORTER_ASSERT(reporter, preCTM == postCTM);
}

DEF_TEST() [5/15]

DEF_TEST	(	Canvas_degenerate_dimension	,
		reporter
	)

Definition at line 637 of file CanvasTest.cpp.

                                                {
    // Need a paint that will sneak us past the quickReject in SkCanvas, so we can test the
    // raster code further downstream.
    SkPaint paint;
    paint.setImageFilter(SkImageFilters::Shader(SkShaders::Color(SK_ColorBLACK), nullptr));
    REPORTER_ASSERT(reporter, !paint.canComputeFastBounds());
 
    const int big = 100 * 1024; // big enough to definitely trigger tiling
    const SkISize sizes[] {SkISize{0, big}, {big, 0}, {0, 0}};
    for (SkISize size : sizes) {
        SkBitmap bm;
        bm.setInfo(SkImageInfo::MakeN32Premul(size.width(), size.height()));
        SkCanvas canvas(bm);
        canvas.drawRect({0, 0, 100, 90*1024}, paint);
    }
}

DEF_TEST() [6/15]

DEF_TEST	(	Canvas_saveLayer_colorSpace	,
		reporter
	)

Definition at line 736 of file CanvasTest.cpp.

                                                {
    SkColor pixels[1];
    const SkImageInfo info = SkImageInfo::MakeN32(1, 1, kOpaque_SkAlphaType);
    SkPixmap pm(info, pixels, sizeof(SkColor));
 
    auto surf = SkSurfaces::WrapPixels(pm);
    auto canvas = surf->getCanvas();
 
    sk_sp<SkColorSpace> cs = SkColorSpace::MakeSRGB()->makeColorSpin();
    canvas->saveLayer(SkCanvas::SaveLayerRec(nullptr, nullptr, nullptr, cs.get(), 0));
    SkPaint paint;
    paint.setColor(SK_ColorRED);
    canvas->drawPaint(paint);
    canvas->restore();
 
    REPORTER_ASSERT(reporter, pm.getColor(0, 0) == SK_ColorBLUE);
}

DEF_TEST() [7/15]

DEF_TEST	(	canvas_savelayer_destructor	,
		reporter
	)

Definition at line 678 of file CanvasTest.cpp.

                                                {
    // What should happen in our destructor if we have unbalanced saveLayers?
 
    SkPMColor pixels[16];
    const SkImageInfo info = SkImageInfo::MakeN32Premul(4, 4);
    SkPixmap pm(info, pixels, 4 * sizeof(SkPMColor));
 
    // check all of the pixel values in pm
    auto check_pixels = [&](SkColor expected) {
        const SkPMColor pmc = SkPreMultiplyColor(expected);
        for (int y = 0; y < pm.info().height(); ++y) {
            for (int x = 0; x < pm.info().width(); ++x) {
                if (*pm.addr32(x, y) != pmc) {
                    ERRORF(reporter, "check_pixels_failed");
                    return;
                }
            }
        }
    };
 
    auto do_test = [&](int saveCount, int restoreCount) {
        SkASSERT(restoreCount <= saveCount);
 
        auto surf = SkSurfaces::WrapPixels(pm);
        auto canvas = surf->getCanvas();
 
        canvas->clear(SK_ColorRED);
        check_pixels(SK_ColorRED);
 
        for (int i = 0; i < saveCount; ++i) {
            canvas->saveLayer(nullptr, nullptr);
        }
 
        canvas->clear(SK_ColorBLUE);
        // so far, we still expect to see the red, since the blue was drawn in a layer
        check_pixels(SK_ColorRED);
 
        for (int i = 0; i < restoreCount; ++i) {
            canvas->restore();
        }
        // by returning, we are implicitly deleting the surface, and its associated canvas
    };
 
    do_test(1, 1);
    // since we called restore, we expect to see now see blue
    check_pixels(SK_ColorBLUE);
 
    // Now repeat that, but delete the canvas before we restore it
    do_test(1, 0);
    // We don't blit the unbalanced saveLayers, so we expect to see red (not the layer's blue)
    check_pixels(SK_ColorRED);
 
    // Finally, test with multiple unbalanced saveLayers. This led to a crash in an earlier
    // implementation (crbug.com/1238731)
    do_test(2, 0);
    check_pixels(SK_ColorRED);
}

DEF_TEST() [8/15]

DEF_TEST	(	Canvas_SaveLayerWithNullBoundsAndZeroBoundsImageFilter	,
		r
	)

Definition at line 625 of file CanvasTest.cpp.

                                                                    {
    SkCanvas canvas(10, 10);
    SkPaint p;
    p.setImageFilter(SkImageFilters::Empty());
    // This should not fail any assert.
    canvas.saveLayer(nullptr, &p);
    REPORTER_ASSERT(r, canvas.getDeviceClipBounds().isEmpty());
    canvas.restore();
}

DEF_TEST() [9/15]

DEF_TEST	(	Canvas_SaveState	,
		reporter
	)

Definition at line 431 of file CanvasTest.cpp.

                                     {
    SkCanvas canvas(10, 10);
    REPORTER_ASSERT(reporter, 1 == canvas.getSaveCount());
 
    int n = canvas.save();
    REPORTER_ASSERT(reporter, 1 == n);
    REPORTER_ASSERT(reporter, 2 == canvas.getSaveCount());
 
    n = canvas.saveLayer(nullptr, nullptr);
    REPORTER_ASSERT(reporter, 2 == n);
    REPORTER_ASSERT(reporter, 3 == canvas.getSaveCount());
 
    canvas.restore();
    REPORTER_ASSERT(reporter, 2 == canvas.getSaveCount());
    canvas.restore();
    REPORTER_ASSERT(reporter, 1 == canvas.getSaveCount());
}

DEF_TEST() [10/15]

DEF_TEST	(	canvas_unsorted_clip	,
		r
	)

Definition at line 87 of file CanvasTest.cpp.

                                  {
    // Test that sorted and unsorted clip rects are forwarded
    // to picture subclasses and/or devices sorted.
    //
    // We can't just test this with an SkCanvas on stack and
    // SkCanvas::getLocalClipBounds(), as that only tests the raster device,
    // which sorts these rects itself.
    for (SkRect clip : {SkRect{0,0,5,5}, SkRect{5,5,0,0}}) {
        SkPictureRecorder rec;
        rec.beginRecording({0,0,10,10})
            ->clipRect(clip);
        sk_sp<SkPicture> pic = rec.finishRecordingAsPicture();
 
        auto bp = (const SkBigPicture*)pic.get();
        const SkRecord* record = bp->record();
 
        REPORTER_ASSERT(r, record->count() == 1);
        REPORTER_ASSERT(r, record->visit(0, ClipRectVisitor{r})
                                .isSorted());
    }
}

DEF_TEST() [11/15]

DEF_TEST	(	CanvasClipType	,
		r
	)

Definition at line 592 of file CanvasTest.cpp.

                            {
    // test rasterclip backend
    test_cliptype(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(10, 10))->getCanvas(), r);
 
#ifdef SK_SUPPORT_PDF
    // test clipstack backend
    SkDynamicMemoryWStream stream;
    if (auto doc = SkPDF::MakeDocument(&stream)) {
        test_cliptype(doc->beginPage(100, 100), r);
    }
#endif
}

DEF_TEST() [12/15]

DEF_TEST	(	CanvasNewRasterTest	,
		reporter
	)

Definition at line 199 of file CanvasTest.cpp.

                                        {
    SkImageInfo info = SkImageInfo::MakeN32Premul(10, 10);
    const size_t minRowBytes = info.minRowBytes();
    const size_t size = info.computeByteSize(minRowBytes);
    AutoTMalloc<SkPMColor> storage(size);
    SkPMColor* baseAddr = storage.get();
    sk_bzero(baseAddr, size);
 
    std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirect(info, baseAddr, minRowBytes);
    REPORTER_ASSERT(reporter, canvas);
 
    SkPixmap pmap;
    const SkPMColor* addr = canvas->peekPixels(&pmap) ? pmap.addr32() : nullptr;
    REPORTER_ASSERT(reporter, addr);
    REPORTER_ASSERT(reporter, info == pmap.info());
    REPORTER_ASSERT(reporter, minRowBytes == pmap.rowBytes());
    for (int y = 0; y < info.height(); ++y) {
        for (int x = 0; x < info.width(); ++x) {
            REPORTER_ASSERT(reporter, 0 == addr[x]);
        }
        addr = (const SkPMColor*)((const char*)addr + pmap.rowBytes());
    }
 
    // unaligned rowBytes
    REPORTER_ASSERT(reporter, nullptr == SkCanvas::MakeRasterDirect(info, baseAddr,
                                                                    minRowBytes + 1));
 
    // now try a deliberately bad info
    info = info.makeWH(-1, info.height());
    REPORTER_ASSERT(reporter, nullptr == SkCanvas::MakeRasterDirect(info, baseAddr, minRowBytes));
 
    // too big
    info = info.makeWH(1 << 30, 1 << 30);
    REPORTER_ASSERT(reporter, nullptr == SkCanvas::MakeRasterDirect(info, baseAddr, minRowBytes));
 
    // not a valid pixel type
    info = SkImageInfo::Make(10, 10, kUnknown_SkColorType, info.alphaType());
    REPORTER_ASSERT(reporter, nullptr == SkCanvas::MakeRasterDirect(info, baseAddr, minRowBytes));
 
    // We should not succeed with a zero-sized valid info
    info = SkImageInfo::MakeN32Premul(0, 0);
    canvas = SkCanvas::MakeRasterDirect(info, baseAddr, minRowBytes);
    REPORTER_ASSERT(reporter, nullptr == canvas);
}

DEF_TEST() [13/15]

DEF_TEST	(	CanvasStack	,
		r
	)

Definition at line 545 of file CanvasTest.cpp.

                         {
    const int w = 10;
    const int h = 10;
    bool life[2];
    std::unique_ptr<SkCanvas> c0 = std::unique_ptr<SkCanvas>(new LifeLineCanvas(w, h, &life[0]));
    std::unique_ptr<SkCanvas> c1 = std::unique_ptr<SkCanvas>(new LifeLineCanvas(w, h, &life[1]));
    REPORTER_ASSERT(r, life[0]);
    REPORTER_ASSERT(r, life[1]);
 
    {
        SkCanvasStack stack(w, h);
        stack.pushCanvas(std::move(c0), {0,0});
        stack.pushCanvas(std::move(c1), {0,0});
        REPORTER_ASSERT(r, life[0]);
        REPORTER_ASSERT(r, life[1]);
    }
    // Now assert that the death of the canvasstack has also killed the sub-canvases
    REPORTER_ASSERT(r, !life[0]);
    REPORTER_ASSERT(r, !life[1]);
}

DEF_TEST() [14/15]

DEF_TEST	(	NWayCanvas	,
		r
	)

Definition at line 516 of file CanvasTest.cpp.

                        {
    const int w = 10;
    const int h = 10;
    bool life[2];
    {
        LifeLineCanvas c0(w, h, &life[0]);
        REPORTER_ASSERT(r, life[0]);
    }
    REPORTER_ASSERT(r, !life[0]);
 
 
    std::unique_ptr<SkCanvas> c0 = std::unique_ptr<SkCanvas>(new LifeLineCanvas(w, h, &life[0]));
    std::unique_ptr<SkCanvas> c1 = std::unique_ptr<SkCanvas>(new LifeLineCanvas(w, h, &life[1]));
    REPORTER_ASSERT(r, life[0]);
    REPORTER_ASSERT(r, life[1]);
 
    {
        SkNWayCanvas nway(w, h);
        nway.addCanvas(c0.get());
        nway.addCanvas(c1.get());
        REPORTER_ASSERT(r, life[0]);
        REPORTER_ASSERT(r, life[1]);
    }
    // Now assert that the death of the nway has NOT also killed the sub-canvases
    REPORTER_ASSERT(r, life[0]);
    REPORTER_ASSERT(r, life[1]);
}

DEF_TEST() [15/15]

DEF_TEST	(	PaintFilterCanvas_ConsistentState	,
		reporter
	)

Definition at line 481 of file CanvasTest.cpp.

                                                      {
    SkCanvas canvas(100, 100);
    canvas.clipRect(SkRect::MakeXYWH(12.7f, 12.7f, 75, 75));
    canvas.scale(0.5f, 0.75f);
 
    MockFilterCanvas filterCanvas(&canvas);
    REPORTER_ASSERT(reporter, canvas.getTotalMatrix() == filterCanvas.getTotalMatrix());
    REPORTER_ASSERT(reporter, canvas.getLocalClipBounds() == filterCanvas.getLocalClipBounds());
 
    filterCanvas.clipRect(SkRect::MakeXYWH(30.5f, 30.7f, 100, 100));
    filterCanvas.scale(0.75f, 0.5f);
    REPORTER_ASSERT(reporter, canvas.getTotalMatrix() == filterCanvas.getTotalMatrix());
    REPORTER_ASSERT(reporter, filterCanvas.getLocalClipBounds().contains(canvas.getLocalClipBounds()));
}

make_n32_bitmap()

static SkBitmap make_n32_bitmap ( int  w, int  h, SkColor  c = SK_ColorWHITE  )

static

Definition at line 256 of file CanvasTest.cpp.

                                                                         {
    SkBitmap bm;
    bm.allocN32Pixels(w, h);
    bm.eraseColor(c);
    return bm;
}

make_path_from_rect()

static SkPath make_path_from_rect ( SkRect  r )

static

Definition at line 244 of file CanvasTest.cpp.

                                            {
    SkPath path;
    path.addRect(r);
    return path;
}

make_region_from_irect()

static SkRegion make_region_from_irect ( SkIRect  r )

static

Definition at line 250 of file CanvasTest.cpp.

                                                  {
    SkRegion region;
    region.setRect(r);
    return region;
}

test_cliptype()

static void test_cliptype ( SkCanvas *  canvas, skiatest::Reporter *  r  )

static

Definition at line 566 of file CanvasTest.cpp.

                                                                 {
    REPORTER_ASSERT(r, !canvas->isClipEmpty());
    REPORTER_ASSERT(r, canvas->isClipRect());
 
    canvas->save();
    canvas->clipRect({0, 0, 0, 0});
    REPORTER_ASSERT(r, canvas->isClipEmpty());
    REPORTER_ASSERT(r, !canvas->isClipRect());
    canvas->restore();
 
    canvas->save();
    canvas->clipRect({2, 2, 6, 6});
    REPORTER_ASSERT(r, !canvas->isClipEmpty());
    REPORTER_ASSERT(r, canvas->isClipRect());
    canvas->restore();
 
    canvas->save();
    canvas->clipRect({2, 2, 6, 6}, SkClipOp::kDifference);  // punch a hole in the clip
    REPORTER_ASSERT(r, !canvas->isClipEmpty());
    REPORTER_ASSERT(r, !canvas->isClipRect());
    canvas->restore();
 
    REPORTER_ASSERT(r, !canvas->isClipEmpty());
    REPORTER_ASSERT(r, canvas->isClipRect());
}

test_many_draws()

void test_many_draws	(	skiatest::Reporter *	reporter,
		SkSurface *	surface
	)

Definition at line 756 of file CanvasTest.cpp.

                                                                     {
    SkCanvas* canvas = surface->getCanvas();
    SkPaint paint;
    for (int i = 0; i < 10000; ++i) {
        paint.setColor((0xFF << 24) | i);
        canvas->drawRect(SkRect::MakeXYWH(0, 0, 1, 1), paint);
    }
}

Variable Documentation

kCanvasTests

CanvasTest kCanvasTests[]

static

Definition at line 271 of file CanvasTest.cpp.

kColor

constexpr SkColor kColor = 0x01020304

staticconstexpr

Definition at line 265 of file CanvasTest.cpp.

kHeight

constexpr int kHeight = 2

staticconstexpr

Definition at line 267 of file CanvasTest.cpp.

kRect

constexpr SkRect kRect = {0, 0, 2, 1}

staticconstexpr

Definition at line 264 of file CanvasTest.cpp.

kWidth

constexpr int kWidth = 2

staticconstexpr

Definition at line 266 of file CanvasTest.cpp.