skiagm::ThinAASlide Class Reference

Inheritance diagram for skiagm::ThinAASlide:

Public Member Functions
	ThinAASlide ()
void	load (SkScalar w, SkScalar h) override
void	draw (SkCanvas *canvas) override
bool	animate (double nanos) override
bool	onChar (SkUnichar key) override
Public Member Functions inherited from Slide
virtual SkISize	getDimensions () const
virtual void	gpuTeardown ()
virtual void	draw (SkCanvas *canvas)=0
virtual bool	animate (double nanos)
virtual void	load (SkScalar winWidth, SkScalar winHeight)
virtual void	resize (SkScalar winWidth, SkScalar winHeight)
virtual void	unload ()
virtual bool	onChar (SkUnichar c)
virtual bool	onMouse (SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey modifiers)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
const SkString &	getName ()
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Definition at line 245 of file ThinAASlide.cpp.

Constructor & Destructor Documentation

ThinAASlide()

skiagm::ThinAASlide::ThinAASlide ( )

inline

Definition at line 247 of file ThinAASlide.cpp.

{ fName = "Thin-AA"; }

Member Function Documentation

animate()

bool skiagm::ThinAASlide::animate ( double  nanos )

inlineoverridevirtual

Reimplemented from Slide.

Definition at line 316 of file ThinAASlide.cpp.

                                        {
        SkScalar t = 1e-9 * nanos;
        SkScalar dt = fLastFrameTime < 0.f ? 0.f : t - fLastFrameTime;
        fLastFrameTime = t;
 
        if (!fAnimRotate && !fAnimTranslate) {
            // Keep returning true so that the last frame time is tracked
            fLastFrameTime = -1.f;
            return false;
        }
 
        switch(fCurrentStage) {
            case AnimStage::kMoveLeft:
                fSubpixelX += 2.f * dt;
                if (fSubpixelX >= 1.f) {
                    fSubpixelX = 1.f;
                    fCurrentStage = AnimStage::kMoveDown;
                }
                break;
            case AnimStage::kMoveDown:
                fSubpixelY += 2.f * dt;
                if (fSubpixelY >= 1.f) {
                    fSubpixelY = 1.f;
                    fCurrentStage = AnimStage::kMoveRight;
                }
                break;
            case AnimStage::kMoveRight:
                fSubpixelX -= 2.f * dt;
                if (fSubpixelX <= -1.f) {
                    fSubpixelX = -1.f;
                    fCurrentStage = AnimStage::kMoveUp;
                }
                break;
            case AnimStage::kMoveUp:
                fSubpixelY -= 2.f * dt;
                if (fSubpixelY <= -1.f) {
                    fSubpixelY = -1.f;
                    fCurrentStage = fAnimRotate ? AnimStage::kRotate : AnimStage::kMoveLeft;
                }
                break;
            case AnimStage::kRotate: {
                SkScalar newAngle = fAngle + dt * 15.f;
                bool completed = SkScalarMod(newAngle, 15.f) < SkScalarMod(fAngle, 15.f);
                fAngle = SkScalarMod(newAngle, 360.f);
                if (completed) {
                    // Make sure we're on a 15 degree boundary
                    fAngle = 15.f * SkScalarRoundToScalar(fAngle / 15.f);
                    if (fAnimTranslate) {
                        fCurrentStage = this->getTranslationStage();
                    }
                }
            } break;
        }
 
        return true;
    }

draw()

void skiagm::ThinAASlide::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 281 of file ThinAASlide.cpp.

                                         {
        canvas->clear(0xFFFFFFFF);
        // Move away from screen edge and add instructions
        SkPaint text;
        SkFont font(ToolUtils::DefaultTypeface(), 12);
        canvas->translate(60.f, 20.f);
        canvas->drawString("Each row features a rendering command under different AA strategies. "
                           "Native refers to the current backend of the viewer, e.g. OpenGL.",
                           0, 0, font, text);
 
        canvas->drawString(SkStringPrintf("Stroke width: %.2f ('-' to decrease, '=' to increase)",
                fStrokeWidth), 0, 24, font, text);
        canvas->drawString(SkStringPrintf("Rotation: %.3f ('r' to animate, 'y' sets to 90, 'u' sets"
                " to 0, 'space' adds 15)", fAngle), 0, 36, font, text);
        canvas->drawString(SkStringPrintf("Translation: %.3f, %.3f ('t' to animate)",
                fSubpixelX, fSubpixelY), 0, 48, font, text);
 
        canvas->translate(0.f, 100.f);
 
        // Draw with surface matching current viewer surface type
        this->drawShapes(canvas, "Native", 0, fNative);
 
        // Draw with forced raster backend so it's easy to compare side-by-side
        this->drawShapes(canvas, "Raster", 1, fRaster);
 
        // Draw paths as hairlines + alpha hack
        this->drawShapes(canvas, "Hairline", 2, fHairline);
 
        // Draw at 4x supersampling in bottom left
        this->drawShapes(canvas, "SSx16", 3, fSS4);
 
        // And lastly 16x supersampling in bottom right
        this->drawShapes(canvas, "SSx64", 4, fSS16);
    }

load()

void skiagm::ThinAASlide::load ( SkScalar  w, SkScalar  h  )

inlineoverridevirtual

Reimplemented from Slide.

Definition at line 249 of file ThinAASlide.cpp.

                                               {
        // Setup all base renderers
        fShapes.push_back(RectRenderer::Make());
        fShapes.push_back(PathRenderer::MakeLine());
        fShapes.push_back(PathRenderer::MakeLines(4.f)); // 2 segments
        fShapes.push_back(PathRenderer::MakeCurve(2.f)); // Shallow curve
        fShapes.push_back(PathRenderer::MakeCurve(8.f)); // Deep curve
 
        for (int i = 0; i < fShapes.size(); ++i) {
            fNative.push_back(OffscreenShapeRenderer::Make(fShapes[i], 1));
            fRaster.push_back(OffscreenShapeRenderer::Make(fShapes[i], 1, /* raster */ true));
            fSS4.push_back(OffscreenShapeRenderer::Make(fShapes[i], 4)); // 4x4 -> 16 samples
            fSS16.push_back(OffscreenShapeRenderer::Make(fShapes[i], 8)); // 8x8 -> 64 samples
 
            fHairline.push_back(OffscreenShapeRenderer::Make(fRaster[i]->toHairline(), 1));
        }
 
        // Start it at something subpixel
        fStrokeWidth = 0.5f;
 
        fSubpixelX = 0.f;
        fSubpixelY = 0.f;
        fAngle = 0.f;
 
        fCurrentStage = AnimStage::kMoveLeft;
        fLastFrameTime = -1.f;
 
        // Don't animate in the beginning
        fAnimTranslate = false;
        fAnimRotate = false;
    }

onChar()

bool skiagm::ThinAASlide::onChar ( SkUnichar  key )

inlineoverridevirtual

Reimplemented from Slide.

Definition at line 373 of file ThinAASlide.cpp.

                                        {
            switch(key) {
                case 't':
                    // Toggle translation animation.
                    fAnimTranslate = !fAnimTranslate;
                    if (!fAnimTranslate && fAnimRotate && fCurrentStage != AnimStage::kRotate) {
                        // Turned off an active translation so go to rotating
                        fCurrentStage = AnimStage::kRotate;
                    } else if (fAnimTranslate && !fAnimRotate &&
                               fCurrentStage == AnimStage::kRotate) {
                        // Turned on translation, rotation had been paused too, so reset the stage
                        fCurrentStage = this->getTranslationStage();
                    }
                    return true;
                case 'r':
                    // Toggle rotation animation.
                    fAnimRotate = !fAnimRotate;
                    if (!fAnimRotate && fAnimTranslate && fCurrentStage == AnimStage::kRotate) {
                        // Turned off an active rotation so go back to translation
                        fCurrentStage = this->getTranslationStage();
                    } else if (fAnimRotate && !fAnimTranslate &&
                               fCurrentStage != AnimStage::kRotate) {
                        // Turned on rotation, translation had been paused too, so reset to rotate
                        fCurrentStage = AnimStage::kRotate;
                    }
                    return true;
                case 'u': fAngle = 0.f; return true;
                case 'y': fAngle = 90.f; return true;
                case ' ': fAngle = SkScalarMod(fAngle + 15.f, 360.f); return true;
                case '-': fStrokeWidth = std::max(0.1f, fStrokeWidth - 0.05f); return true;
                case '=': fStrokeWidth = std::min(1.f, fStrokeWidth + 0.05f); return true;
            }
            return false;
    }

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

• third_party/skia/tools/viewer/ThinAASlide.cpp