PosterCircleGM Class Reference

Inheritance diagram for PosterCircleGM:

Public Member Functions
	PosterCircleGM ()
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
bool	onAnimate (double nanos) 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	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

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 30 of file postercircle.cpp.

Constructor & Destructor Documentation

PosterCircleGM()

PosterCircleGM::PosterCircleGM ( )

inline

Definition at line 32 of file postercircle.cpp.

: fTime(0.f) {}

Member Function Documentation

getISize()

SkISize PosterCircleGM::getISize ( )

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 37 of file postercircle.cpp.

{ return SkISize::Make(kStageWidth, kStageHeight + 50); }

getName()

SkString PosterCircleGM::getName ( ) const

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 35 of file postercircle.cpp.

{ return SkString("poster_circle"); }

onAnimate()

bool PosterCircleGM::onAnimate ( double  nanos )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 39 of file postercircle.cpp.

                                          {
        fTime = TimeUtils::Scaled(1e-9 * nanos, 0.5f);
        return true;
    }

onDraw()

void PosterCircleGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 78 of file postercircle.cpp.

                                           {
        // See https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/perspective
        // for projection matrix when --webkit-perspective: 800px is used.
        SkM44 proj;
        proj.setRC(3, 2, -1.f / 800.f);
 
        for (int pass = 0; pass < 2; ++pass) {
            // Want to draw 90 to 270 first (the back), then 270 to 90 (the front), but do all 3
            // rings backsides, then their frontsides since the front projections overlap across
            // rings. Note: we skip the poster circle's x axis rotation because that complicates the
            // back-to-front drawing order and it isn't necessary to trigger draws aligned with Z.
            bool drawFront = pass > 0;
 
            for (int y = 0; y < 3; ++y) {
                float ringY = (y - 1) * (kPosterSize + 10.f);
                for (int i = 0; i < kNumAngles; ++i) {
                    // Add an extra 45 degree rotation, which triggers the bug by aligning some of
                    // the posters with the z axis.
                    SkScalar yDuration = 5.f - y;
                    SkScalar yRotation = SkScalarMod(kAngleStep * i +
                            360.f * SkScalarMod(fTime / yDuration, yDuration), 360.f);
                    // These rotation limits were chosen manually to line up with current projection
                    static constexpr SkScalar kBackMinAngle = 70.f;
                    static constexpr SkScalar kBackMaxAngle = 290.f;
                    if (drawFront) {
                        if (yRotation >= kBackMinAngle && yRotation <= kBackMaxAngle) {
                            // Back portion during a front draw
                            continue;
                        }
                    } else {
                        if (yRotation < kBackMinAngle || yRotation > kBackMaxAngle) {
                            // Front portion during a back draw
                            continue;
                        }
                    }
 
                    canvas->save();
 
                    // Matrix matches transform: rotateY(<angle>deg) translateZ(200px); nested in an
                    // element with the perspective projection matrix above.
                    SkM44 model = SkM44::Translate(kStageWidth/2, kStageHeight/2 + 25, 0)
                                * proj
                                * SkM44::Translate(0, ringY, 0)
                                * SkM44::Rotate({0,1,0}, SkDegreesToRadians(yRotation))
                                * SkM44::Translate(0, 0, kRingRadius);
                    canvas->concat(model);
 
                    SkRect poster = SkRect::MakeLTRB(-0.5f * kPosterSize, -0.5f * kPosterSize,
                                                      0.5f * kPosterSize,  0.5f * kPosterSize);
                    SkPaint fillPaint;
                    fillPaint.setAntiAlias(true);
                    fillPaint.setAlphaf(0.7f);
                    canvas->drawImageRect(fPosterImages[i], poster,
                                          SkSamplingOptions(SkFilterMode::kLinear), &fillPaint);
 
                    canvas->restore();
                }
            }
        }
    }

onOnceBeforeDraw()

void PosterCircleGM::onOnceBeforeDraw ( )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 44 of file postercircle.cpp.

                                     {
        SkFont font = ToolUtils::DefaultPortableFont();
        font.setEdging(SkFont::Edging::kAntiAlias);
        font.setEmbolden(true);
        font.setSize(24.f);
 
        sk_sp<SkSurface> surface =
                SkSurfaces::Raster(SkImageInfo::MakeN32Premul(kPosterSize, kPosterSize));
        for (int i = 0; i < kNumAngles; ++i) {
            SkCanvas* canvas = surface->getCanvas();
 
            SkPaint fillPaint;
            fillPaint.setAntiAlias(true);
            fillPaint.setColor(i % 2 == 0 ? SkColorSetRGB(0x99, 0x5C, 0x7F)
                                          : SkColorSetRGB(0x83, 0x5A, 0x99));
            canvas->drawRRect(SkRRect::MakeRectXY(SkRect::MakeWH(kPosterSize, kPosterSize),
                                                  10.f, 10.f), fillPaint);
 
            SkString label;
            label.printf("%d", i);
            SkRect labelBounds;
            font.measureText(label.c_str(), label.size(), SkTextEncoding::kUTF8, &labelBounds);
            SkScalar labelX = 0.5f * kPosterSize - 0.5f * labelBounds.width();
            SkScalar labelY = 0.5f * kPosterSize + 0.5f * labelBounds.height();
 
 
            SkPaint labelPaint;
            labelPaint.setAntiAlias(true);
            canvas->drawString(label, labelX, labelY, font, labelPaint);
 
            fPosterImages[i] = surface->makeImageSnapshot();
        }
    }

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

• third_party/skia/gm/postercircle.cpp