DegenerateQuadSlide Class Reference

Inheritance diagram for DegenerateQuadSlide:

Classes
class	Click

Public Member Functions
	DegenerateQuadSlide (const SkRect &rect)
void	draw (SkCanvas *canvas) override
bool	onChar (SkUnichar) override
Public Member Functions inherited from ClickHandlerSlide
bool	onMouse (SkScalar x, SkScalar y, skui::InputState clickState, skui::ModifierKey modifierKeys) final
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

Protected Member Functions
Click *	onFindClickHandler (SkScalar x, SkScalar y, skui::ModifierKey) override
bool	onClick (Click *) override
Protected Member Functions inherited from ClickHandlerSlide
virtual Click *	onFindClickHandler (SkScalar x, SkScalar y, skui::ModifierKey modi)=0
virtual bool	onClick (Click *)=0

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Definition at line 240 of file DegenerateQuadsSlide.cpp.

Constructor & Destructor Documentation

DegenerateQuadSlide()

DegenerateQuadSlide::DegenerateQuadSlide ( const SkRect &  rect )

inline

Definition at line 242 of file DegenerateQuadsSlide.cpp.

            : fOuterRect(rect)
            , fCoverageMode(CoverageMode::kArea) {
        fOuterRect.toQuad(fCorners);
        for (int i = 0; i < 4; ++i) {
            fEdgeAA[i] = true;
        }
        fName = "DegenerateQuad";
    }

Member Function Documentation

draw()

void DegenerateQuadSlide::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 252 of file DegenerateQuadsSlide.cpp.

                                         {
        static const SkScalar kDotParams[2] = {1.f / kViewScale, 12.f / kViewScale};
        sk_sp<SkPathEffect> dots = SkDashPathEffect::Make(kDotParams, 2, 0.f);
        static const SkScalar kDashParams[2] = {8.f / kViewScale, 12.f / kViewScale};
        sk_sp<SkPathEffect> dashes = SkDashPathEffect::Make(kDashParams, 2, 0.f);
 
        SkPaint circlePaint;
        circlePaint.setAntiAlias(true);
 
        SkPaint linePaint;
        linePaint.setAntiAlias(true);
        linePaint.setStyle(SkPaint::kStroke_Style);
        linePaint.setStrokeWidth(4.f / kViewScale);
        linePaint.setStrokeJoin(SkPaint::kRound_Join);
        linePaint.setStrokeCap(SkPaint::kRound_Cap);
 
        canvas->translate(kViewOffset, kViewOffset);
        canvas->scale(kViewScale, kViewScale);
 
        // Draw the outer rectangle as a dotted line
        linePaint.setPathEffect(dots);
        canvas->drawRect(fOuterRect, linePaint);
 
        bool valid = this->isValid();
 
        if (valid) {
            SkPoint outsets[8];
            SkPoint insets[8];
            // Calculate inset and outset lines for edge-distance visualization
            for (int i = 0; i < 4; ++i) {
                make_aa_line(fCorners[i], fCorners[(i + 1) % 4], fEdgeAA[i], true, outsets + i * 2);
                make_aa_line(fCorners[i], fCorners[(i + 1) % 4], fEdgeAA[i], false, insets + i * 2);
            }
 
            // Calculate inner and outer meshes for GPU visualization
            SkPoint gpuOutset[4];
            SkScalar gpuOutsetCoverage[4];
            SkPoint gpuInset[4];
            SkScalar gpuInsetCoverage[4];
            SkRect gpuDomain;
            this->getTessellatedPoints(gpuInset, gpuInsetCoverage, gpuOutset, gpuOutsetCoverage,
                                       &gpuDomain);
 
            // Visualize the coverage values across the clamping rectangle, but test pixels outside
            // of the "outer" rect since some quad edges can be outset extra far.
            SkPaint pixelPaint;
            pixelPaint.setAntiAlias(true);
            SkRect covRect = fOuterRect.makeOutset(2.f, 2.f);
            for (SkScalar py = covRect.fTop; py < covRect.fBottom; py += 1.f) {
                for (SkScalar px = covRect.fLeft; px < covRect.fRight; px += 1.f) {
                    // px and py are the top-left corner of the current pixel, so get center's
                    // coordinate
                    SkPoint pixelCenter = {px + 0.5f, py + 0.5f};
                    SkScalar coverage;
                    if (fCoverageMode == CoverageMode::kArea) {
                        coverage = get_area_coverage(fEdgeAA, fCorners, pixelCenter);
                    } else if (fCoverageMode == CoverageMode::kEdgeDistance) {
                        coverage = get_edge_dist_coverage(fEdgeAA, fCorners, outsets, insets,
                                                          pixelCenter);
                    } else {
                        SkASSERT(fCoverageMode == CoverageMode::kGPUMesh);
                        coverage = get_framed_coverage(gpuOutset, gpuOutsetCoverage,
                                                       gpuInset, gpuInsetCoverage, gpuDomain,
                                                       pixelCenter);
                    }
 
                    SkRect pixelRect = SkRect::MakeXYWH(px, py, 1.f, 1.f);
                    pixelRect.inset(0.1f, 0.1f);
 
                    SkScalar a = 1.f - 0.5f * coverage;
                    pixelPaint.setColor4f({a, a, a, 1.f}, nullptr);
                    canvas->drawRect(pixelRect, pixelPaint);
 
                    pixelPaint.setColor(coverage > 0.f ? SK_ColorGREEN : SK_ColorRED);
                    pixelRect.inset(0.38f, 0.38f);
                    canvas->drawRect(pixelRect, pixelPaint);
                }
            }
 
            linePaint.setPathEffect(dashes);
            // Draw the inset/outset "infinite" lines
            if (fCoverageMode == CoverageMode::kEdgeDistance) {
                for (int i = 0; i < 4; ++i) {
                    if (fEdgeAA[i]) {
                        linePaint.setColor(SK_ColorBLUE);
                        draw_extended_line(canvas, linePaint, outsets[i * 2], outsets[i * 2 + 1]);
                        linePaint.setColor(SK_ColorGREEN);
                        draw_extended_line(canvas, linePaint, insets[i * 2], insets[i * 2 + 1]);
                    } else {
                        // Both outset and inset are the same line, so only draw one in cyan
                        linePaint.setColor(SK_ColorCYAN);
                        draw_extended_line(canvas, linePaint, outsets[i * 2], outsets[i * 2 + 1]);
                    }
                }
            }
 
            linePaint.setPathEffect(nullptr);
            // What is tessellated using GrQuadPerEdgeAA
            if (fCoverageMode == CoverageMode::kGPUMesh) {
                SkPath outsetPath;
                outsetPath.addPoly(gpuOutset, 4, true);
                linePaint.setColor(SK_ColorBLUE);
                canvas->drawPath(outsetPath, linePaint);
 
                SkPath insetPath;
                insetPath.addPoly(gpuInset, 4, true);
                linePaint.setColor(SK_ColorGREEN);
                canvas->drawPath(insetPath, linePaint);
 
                SkPaint domainPaint = linePaint;
                domainPaint.setStrokeWidth(2.f / kViewScale);
                domainPaint.setPathEffect(dashes);
                domainPaint.setColor(SK_ColorMAGENTA);
                canvas->drawRect(gpuDomain, domainPaint);
            }
 
            // Draw the edges of the true quad as a solid line
            SkPath path;
            path.addPoly(fCorners, 4, true);
            linePaint.setColor(SK_ColorBLACK);
            canvas->drawPath(path, linePaint);
        } else {
            // Draw the edges of the true quad as a solid *red* line
            SkPath path;
            path.addPoly(fCorners, 4, true);
            linePaint.setColor(SK_ColorRED);
            linePaint.setPathEffect(nullptr);
            canvas->drawPath(path, linePaint);
        }
 
        // Draw the four clickable corners as circles
        circlePaint.setColor(valid ? SK_ColorBLACK : SK_ColorRED);
        for (int i = 0; i < 4; ++i) {
            canvas->drawCircle(fCorners[i], 5.f / kViewScale, circlePaint);
        }
    }

onChar()

bool DegenerateQuadSlide::onChar ( SkUnichar  code )

overridevirtual

Reimplemented from Slide.

Definition at line 505 of file DegenerateQuadsSlide.cpp.

                                               {
        switch(code) {
            case '1':
                fEdgeAA[0] = !fEdgeAA[0];
                return true;
            case '2':
                fEdgeAA[1] = !fEdgeAA[1];
                return true;
            case '3':
                fEdgeAA[2] = !fEdgeAA[2];
                return true;
            case '4':
                fEdgeAA[3] = !fEdgeAA[3];
                return true;
            case 'q':
                fCoverageMode = CoverageMode::kArea;
                return true;
            case 'w':
                fCoverageMode = CoverageMode::kEdgeDistance;
                return true;
            case 'e':
                fCoverageMode = CoverageMode::kGPUMesh;
                return true;
        }
        return false;
}

onClick()

bool DegenerateQuadSlide::onClick ( Click *  )

overrideprotected

Definition at line 499 of file DegenerateQuadsSlide.cpp.

                                                               {
    Click* myClick = (Click*) click;
    myClick->doClick(fCorners);
    return true;
}

onFindClickHandler()

ClickHandlerSlide::Click * DegenerateQuadSlide::onFindClickHandler ( SkScalar  x, SkScalar  y, skui::ModifierKey  modi  )

overrideprotectedvirtual

Return a Click object to handle the click. onClick will be called repeatedly with the latest mouse state tracked on the Click object until it returns false.

Implements ClickHandlerSlide.

Definition at line 488 of file DegenerateQuadsSlide.cpp.

                                                                                   {
    SkPoint inCTM = SkPoint::Make((x - kViewOffset) / kViewScale, (y - kViewOffset) / kViewScale);
    for (int i = 0; i < 4; ++i) {
        if ((fCorners[i] - inCTM).length() < 10.f / kViewScale) {
            return new Click(fOuterRect, i);
        }
    }
    return new Click(fOuterRect, -1);
}

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

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