skiagm::PolygonsGM Class Reference

Inheritance diagram for skiagm::PolygonsGM:

Public Member Functions
	PolygonsGM ()
Public Member Functions inherited from skiagm::GM
	GM (SkColor backgroundColor=SK_ColorWHITE)
virtual	~GM ()
void	setMode (Mode mode)
Mode	getMode () const
DrawResult	gpuSetup (SkCanvas *, SkString *errorMsg, GraphiteTestContext *=nullptr)
void	gpuTeardown ()
void	onceBeforeDraw ()
DrawResult	draw (SkCanvas *canvas)
DrawResult	draw (SkCanvas *, SkString *errorMsg)
void	drawBackground (SkCanvas *)
DrawResult	drawContent (SkCanvas *canvas)
DrawResult	drawContent (SkCanvas *, SkString *errorMsg)
virtual bool	runAsBench () const
SkScalar	width ()
SkScalar	height ()
SkColor	getBGColor () const
void	setBGColor (SkColor)
void	drawSizeBounds (SkCanvas *, SkColor)
bool	animate (double)
virtual bool	onChar (SkUnichar)
bool	getControls (SkMetaData *controls)
void	setControls (const SkMetaData &controls)
virtual void	modifyGrContextOptions (GrContextOptions *)
virtual void	modifyGraphiteContextOptions (skgpu::graphite::ContextOptions *) const
virtual bool	isBazelOnly () const
virtual std::map< std::string, std::string >	getGoldKeys () const

Protected Member Functions
SkString	getName () const override
SkISize	getISize () override
void	onOnceBeforeDraw () override
void	onDraw (SkCanvas *canvas) override
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual bool	onAnimate (double)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

Static Protected Member Functions
static void	SetLocation (SkCanvas *canvas, int counter, int lineNum)
static void	SetColorAndAlpha (SkPaint *paint, SkRandom *rand)

Additional Inherited Members
Public Types inherited from skiagm::GM
enum	Mode { kGM_Mode , kSample_Mode , kBench_Mode }
using	DrawResult = skiagm::DrawResult
using	GraphiteTestContext = skiatest::graphite::GraphiteTestContext
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []

Detailed Description

Definition at line 28 of file polygons.cpp.

Constructor & Destructor Documentation

PolygonsGM()

skiagm::PolygonsGM::PolygonsGM ( )

inline

Definition at line 30 of file polygons.cpp.

{}

Member Function Documentation

getISize()

SkISize skiagm::PolygonsGM::getISize ( )

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 35 of file polygons.cpp.

                                {
        int width = kNumPolygons * kCellSize + 40;
        int height = (kNumJoins * kNumStrokeWidths + kNumExtraStyles) * kCellSize + 40;
        return SkISize::Make(width, height);
    }

getName()

SkString skiagm::PolygonsGM::getName ( ) const

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 33 of file polygons.cpp.

{ return SkString("polygons"); }

onDraw()

void skiagm::PolygonsGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 104 of file polygons.cpp.

                                           {
        // Stroke widths are:
        // 0(may use hairline rendering), 10(common case for stroke-style)
        // 40(>= geometry width/height, make the contour filled in fact)
        constexpr int kStrokeWidths[] = {0, 10, 40};
        SkASSERT(kNumStrokeWidths == std::size(kStrokeWidths));
 
        constexpr SkPaint::Join kJoins[] = {
            SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
        };
        SkASSERT(kNumJoins == std::size(kJoins));
 
        int counter = 0;
        SkPaint paint;
        paint.setAntiAlias(true);
 
        SkRandom rand;
        // For stroke style painter
        paint.setStyle(SkPaint::kStroke_Style);
        for (int join = 0; join < kNumJoins; ++join) {
            for (int width = 0; width < kNumStrokeWidths; ++width) {
                for (int i = 0; i < fPolygons.size(); ++i) {
                    canvas->save();
                    SetLocation(canvas, counter, fPolygons.size());
 
                    SetColorAndAlpha(&paint, &rand);
                    paint.setStrokeJoin(kJoins[join]);
                    paint.setStrokeWidth(SkIntToScalar(kStrokeWidths[width]));
 
                    canvas->drawPath(fPolygons[i], paint);
                    canvas->restore();
                    ++counter;
                }
            }
        }
 
        // For stroke-and-fill style painter and fill style painter
        constexpr SkPaint::Style kStyles[] = {
            SkPaint::kStrokeAndFill_Style, SkPaint::kFill_Style
        };
        SkASSERT(kNumExtraStyles == std::size(kStyles));
 
        paint.setStrokeJoin(SkPaint::kMiter_Join);
        paint.setStrokeWidth(SkIntToScalar(20));
        for (int style = 0; style < kNumExtraStyles; ++style) {
            paint.setStyle(kStyles[style]);
            for (int i = 0; i < fPolygons.size(); ++i) {
                canvas->save();
                SetLocation(canvas, counter, fPolygons.size());
                SetColorAndAlpha(&paint, &rand);
                canvas->drawPath(fPolygons[i], paint);
                canvas->restore();
                ++counter;
            }
        }
    }

onOnceBeforeDraw()

void skiagm::PolygonsGM::onOnceBeforeDraw ( )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 42 of file polygons.cpp.

                                     {
        SkPoint p0[] = {{0, 0}, {60, 0}, {90, 40}};  // triangle
        SkPoint p1[] = {{0, 0}, {0, 40}, {60, 40}, {40, 0}};  // trapezoid
        SkPoint p2[] = {{0, 0}, {40, 40}, {80, 40}, {40, 0}};  // diamond
        SkPoint p3[] = {{10, 0}, {50, 0}, {60, 10}, {60, 30}, {50, 40},
                        {10, 40}, {0, 30}, {0, 10}};  // octagon
        SkPoint p4[32];  // circle-like polygons with 32-edges.
        SkPoint p5[] = {{0, 0}, {20, 20}, {0, 40}, {60, 20}};  // concave polygon with 4 edges
        SkPoint p6[] = {{0, 40}, {0, 30}, {15, 30}, {15, 20}, {30, 20},
                        {30, 10}, {45, 10}, {45, 0}, {60, 0}, {60, 40}};  // stairs-like polygon
        SkPoint p7[] = {{0, 20}, {20, 20}, {30, 0}, {40, 20}, {60, 20},
                        {45, 30}, {55, 50}, {30, 40}, {5, 50}, {15, 30}};  // five-point stars
 
        for (size_t i = 0; i < std::size(p4); ++i) {
            SkScalar angle = 2 * SK_ScalarPI * i / std::size(p4);
            p4[i].set(20 * SkScalarCos(angle) + 20, 20 * SkScalarSin(angle) + 20);
        }
 
        struct Polygons {
            SkPoint* fPoints;
            size_t fPointNum;
        } pgs[] = {
            { p0, std::size(p0) },
            { p1, std::size(p1) },
            { p2, std::size(p2) },
            { p3, std::size(p3) },
            { p4, std::size(p4) },
            { p5, std::size(p5) },
            { p6, std::size(p6) },
            { p7, std::size(p7) }
        };
 
        SkASSERT(std::size(pgs) == kNumPolygons);
        for (size_t pgIndex = 0; pgIndex < std::size(pgs); ++pgIndex) {
            SkPathBuilder b;
            b.moveTo(pgs[pgIndex].fPoints[0].fX,
                     pgs[pgIndex].fPoints[0].fY);
            for (size_t ptIndex = 1; ptIndex < pgs[pgIndex].fPointNum; ++ptIndex) {
                b.lineTo(pgs[pgIndex].fPoints[ptIndex].fX,
                         pgs[pgIndex].fPoints[ptIndex].fY);
            }
            b.close();
            fPolygons.push_back(b.detach());
        }
    }

SetColorAndAlpha()

static void skiagm::PolygonsGM::SetColorAndAlpha ( SkPaint *  paint, SkRandom *  rand  )

inlinestaticprotected

Definition at line 95 of file polygons.cpp.

                                                                 {
        SkColor color = rand->nextU();
        color |= 0xff000000;
        paint->setColor(color);
        if (40 == paint->getStrokeWidth()) {
            paint->setAlpha(0xA0);
        }
    }

SetLocation()

static void skiagm::PolygonsGM::SetLocation ( SkCanvas *  canvas, int  counter, int  lineNum  )

inlinestaticprotected

Definition at line 89 of file polygons.cpp.

                                                                        {
        SkScalar x = SK_Scalar1 * kCellSize * (counter % lineNum) + 30 + SK_Scalar1 / 4;
        SkScalar y = SK_Scalar1 * kCellSize * (counter / lineNum) + 30 + 3 * SK_Scalar1 / 4;
        canvas->translate(x, y);
    }

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The documentation for this class was generated from the following file:

• third_party/skia/gm/polygons.cpp