skiagm::ConvexPolyEffect Class Reference

Inheritance diagram for skiagm::ConvexPolyEffect:

Public Member Functions
	ConvexPolyEffect ()

Protected Member Functions
SkString	getName () const override
SkISize	getISize () override
void	onOnceBeforeDraw () override
DrawResult	onDraw (GrRecordingContext *rContext, SkCanvas *canvas, SkString *errorMsg) override

Detailed Description

This GM directly exercises a GrProcessor that draws convex polygons.

Definition at line 41 of file convexpolyeffect.cpp.

Constructor & Destructor Documentation

ConvexPolyEffect()

skiagm::ConvexPolyEffect::ConvexPolyEffect ( )

inline

Definition at line 43 of file convexpolyeffect.cpp.

                       {
        this->setBGColor(0xFFFFFFFF);
    }

Member Function Documentation

getISize()

SkISize skiagm::ConvexPolyEffect::getISize ( )

inlineoverrideprotected

Definition at line 50 of file convexpolyeffect.cpp.

{ return SkISize::Make(720, 550); }

getName()

SkString skiagm::ConvexPolyEffect::getName ( ) const

inlineoverrideprotected

Definition at line 48 of file convexpolyeffect.cpp.

{ return SkString("convex_poly_effect"); }

onDraw()

DrawResult skiagm::ConvexPolyEffect::onDraw ( GrRecordingContext *  rContext, SkCanvas *  canvas, SkString *  errorMsg  )

inlineoverrideprotected

Definition at line 92 of file convexpolyeffect.cpp.

                                                                                                   {
        auto sdc = skgpu::ganesh::TopDeviceSurfaceDrawContext(canvas);
        if (!sdc) {
            *errorMsg = kErrorMsg_DrawSkippedGpuOnly;
            return DrawResult::kSkip;
        }
 
        SkScalar y = 0;
        static constexpr SkScalar kDX = 12.f;
        static constexpr SkScalar kOutset = 5.f;
 
        for (const SkPath& path : fPaths) {
            SkScalar x = 0;
 
            for (int et = 0; et < kGrClipEdgeTypeCnt; ++et) {
                const SkMatrix m = SkMatrix::Translate(x, y);
                SkPath p;
                path.transform(m, &p);
 
                GrClipEdgeType edgeType = (GrClipEdgeType) et;
                auto [success, fp] = GrConvexPolyEffect::Make(/*inputFP=*/nullptr, edgeType, p);
                if (!success) {
                    continue;
                }
 
                GrPaint grPaint;
                grPaint.setColor4f({ 0, 0, 0, 1.f });
                grPaint.setXPFactory(GrPorterDuffXPFactory::Get(SkBlendMode::kSrc));
                grPaint.setCoverageFragmentProcessor(std::move(fp));
                auto rect = p.getBounds().makeOutset(kOutset, kOutset);
                auto op = sk_gpu_test::test_ops::MakeRect(rContext, std::move(grPaint), rect);
                sdc->addDrawOp(std::move(op));
 
                x += SkScalarCeilToScalar(path.getBounds().width() + kDX);
            }
 
            // Draw AA and non AA paths using normal API for reference.
            canvas->save();
            canvas->translate(x, y);
            SkPaint paint;
            canvas->drawPath(path, paint);
            canvas->translate(path.getBounds().width() + 10.f, 0);
            paint.setAntiAlias(true);
            canvas->drawPath(path, paint);
            canvas->restore();
 
            y += SkScalarCeilToScalar(path.getBounds().height() + 20.f);
        }
 
        return DrawResult::kOk;
    }

onOnceBeforeDraw()

void skiagm::ConvexPolyEffect::onOnceBeforeDraw ( )

inlineoverrideprotected

Definition at line 52 of file convexpolyeffect.cpp.

                                     {
        SkPath tri;
        tri.moveTo(5.f, 5.f);
        tri.lineTo(100.f, 20.f);
        tri.lineTo(15.f, 100.f);
 
        fPaths.push_back(tri);
        fPaths.emplace_back();
        fPaths.back().reverseAddPath(tri);
 
        tri.close();
        fPaths.push_back(tri);
 
        SkPath ngon;
        constexpr SkScalar kRadius = 50.f;
        const SkPoint center = { kRadius, kRadius };
        for (int i = 0; i < GrConvexPolyEffect::kMaxEdges; ++i) {
            SkScalar angle = 2 * SK_ScalarPI * i / GrConvexPolyEffect::kMaxEdges;
            SkPoint point = { SkScalarCos(angle), SkScalarSin(angle) };
            point.scale(kRadius);
            point = center + point;
            if (0 == i) {
                ngon.moveTo(point);
            } else {
                ngon.lineTo(point);
            }
        }
 
        fPaths.push_back(ngon);
        SkMatrix scaleM;
        scaleM.setScale(1.1f, 0.4f);
        ngon.transform(scaleM);
        fPaths.push_back(ngon);
 
        SkPath linePath;
        linePath.moveTo(5.f, 5.f);
        linePath.lineTo(6.f, 6.f);
        fPaths.push_back(linePath);
    }

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

• third_party/skia/gm/convexpolyeffect.cpp