EllipseOp Class Reference

Inheritance diagram for EllipseOp:

Public Member Functions
	EllipseOp (GrProcessorSet *processorSet, const SkPMColor4f &color, const SkMatrix &viewMatrix, const DeviceSpaceParams &params, const SkStrokeRec &stroke)
const char *	name () const override
void	visitProxies (const GrVisitProxyFunc &func) const override
GrProcessorSet::Analysis	finalize (const GrCaps &caps, const GrAppliedClip *clip, GrClampType clampType) override
FixedFunctionFlags	fixedFunctionFlags () const override
Public Member Functions inherited from GrDrawOp
	GrDrawOp (uint32_t classID)
virtual bool	usesMSAA () const
virtual ClipResult	clipToShape (skgpu::ganesh::SurfaceDrawContext *, SkClipOp, const SkMatrix &, const GrShape &, GrAA)
virtual bool	usesStencil () const
Public Member Functions inherited from GrOp
virtual	~GrOp ()=default
CombineResult	combineIfPossible (GrOp *that, SkArenaAlloc *alloc, const GrCaps &caps)
const SkRect &	bounds () const
void	setClippedBounds (const SkRect &clippedBounds)
bool	hasAABloat () const
bool	hasZeroArea () const
void	operator delete (void *p)
template<typename T >
const T &	cast () const
template<typename T >
T *	cast ()
uint32_t	classID () const
uint32_t	uniqueID () const
void	prePrepare (GrRecordingContext *context, const GrSurfaceProxyView &dstView, GrAppliedClip *clip, const GrDstProxyView &dstProxyView, GrXferBarrierFlags renderPassXferBarriers, GrLoadOp colorLoadOp)
void	prepare (GrOpFlushState *state)
void	execute (GrOpFlushState *state, const SkRect &chainBounds)
void	chainConcat (GrOp::Owner)
bool	isChainHead () const
bool	isChainTail () const
GrOp *	nextInChain () const
GrOp *	prevInChain () const
GrOp::Owner	cutChain ()
void	setBounds (const SkRect &newBounds, HasAABloat aabloat, IsHairline zeroArea)
void	setTransformedBounds (const SkRect &srcBounds, const SkMatrix &m, HasAABloat aabloat, IsHairline zeroArea)
void	makeFullScreen (GrSurfaceProxy *proxy)

Static Public Member Functions
static DEFINE_OP_CLASS_ID GrOp::Owner	Make (GrRecordingContext *context, GrPaint &&paint, const SkMatrix &viewMatrix, const SkRect &ellipse, const SkStrokeRec &stroke)
Static Public Member Functions inherited from GrMeshDrawOp
static bool	CanUpgradeAAOnMerge (GrAAType aa1, GrAAType aa2)
Static Public Member Functions inherited from GrOp
template<typename Op , typename... Args>
static Owner	Make (GrRecordingContext *context, Args &&... args)
template<typename Op , typename... Args>
static Owner	MakeWithProcessorSet (GrRecordingContext *context, const SkPMColor4f &color, GrPaint &&paint, Args &&... args)
template<typename Op , typename... Args>
static Owner	MakeWithExtraMemory (GrRecordingContext *context, size_t extraSize, Args &&... args)
static uint32_t	GenOpClassID ()

Private Member Functions
GrProgramInfo *	programInfo () override
void	onCreateProgramInfo (const GrCaps *caps, SkArenaAlloc *arena, const GrSurfaceProxyView &writeView, bool usesMSAASurface, GrAppliedClip &&appliedClip, const GrDstProxyView &dstProxyView, GrXferBarrierFlags renderPassXferBarriers, GrLoadOp colorLoadOp) override
void	onPrepareDraws (GrMeshDrawTarget *target) override
void	onExecute (GrOpFlushState *flushState, const SkRect &chainBounds) override
CombineResult	onCombineIfPossible (GrOp *t, SkArenaAlloc *, const GrCaps &caps) override

Additional Inherited Members
Public Types inherited from GrDrawOp
enum class	ClipResult { kFail , kClippedGeometrically , kClippedInShader , kClippedOut }
Public Types inherited from GrOp
enum class	CombineResult { kMerged , kMayChain , kCannotCombine }
enum class	HasAABloat : bool { kNo = false , kYes = true }
enum class	IsHairline : bool { kNo = false , kYes = true }
using	Owner = std::unique_ptr< GrOp >
Protected Types inherited from GrDrawOp
enum class	FixedFunctionFlags : uint32_t { kNone = 0x0 , kUsesHWAA = 0x1 , kUsesStencil = 0x2 }
Protected Member Functions inherited from GrMeshDrawOp
	GrMeshDrawOp (uint32_t classID)
void	createProgramInfo (const GrCaps *caps, SkArenaAlloc *arena, const GrSurfaceProxyView &writeView, bool usesMSAASurface, GrAppliedClip &&appliedClip, const GrDstProxyView &dstProxyView, GrXferBarrierFlags renderPassXferBarriers, GrLoadOp colorLoadOp)
void	createProgramInfo (GrMeshDrawTarget *)
virtual void	onPrePrepareDraws (GrRecordingContext *, const GrSurfaceProxyView &writeView, GrAppliedClip *, const GrDstProxyView &, GrXferBarrierFlags renderPassXferBarriers, GrLoadOp colorLoadOp)
Protected Member Functions inherited from GrDrawOp
	GR_DECL_BITFIELD_CLASS_OPS_FRIENDS (FixedFunctionFlags)
Static Protected Member Functions inherited from GrMeshDrawOp
static bool	CombinedQuadCountWillOverflow (GrAAType aaType, bool willBeUpgradedToAA, int combinedQuadCount)

Detailed Description

Definition at line 1821 of file GrOvalOpFactory.cpp.

Constructor & Destructor Documentation

EllipseOp()

EllipseOp::EllipseOp ( GrProcessorSet *  processorSet, const SkPMColor4f &  color, const SkMatrix &  viewMatrix, const DeviceSpaceParams &  params, const SkStrokeRec &  stroke  )

inline

Definition at line 1913 of file GrOvalOpFactory.cpp.

            : INHERITED(ClassID())
            , fHelper(processorSet, GrAAType::kCoverage)
            , fUseScale(false) {
        SkStrokeRec::Style style = stroke.getStyle();
        bool isStrokeOnly =
                SkStrokeRec::kStroke_Style == style || SkStrokeRec::kHairline_Style == style;
 
        fEllipses.emplace_back(Ellipse{color, params.fXRadius, params.fYRadius,
                                       params.fInnerXRadius, params.fInnerYRadius,
                                       SkRect::MakeLTRB(params.fCenter.fX - params.fXRadius,
                                                        params.fCenter.fY - params.fYRadius,
                                                        params.fCenter.fX + params.fXRadius,
                                                        params.fCenter.fY + params.fYRadius)});
 
        this->setBounds(fEllipses.back().fDevBounds, HasAABloat::kYes, IsHairline::kNo);
 
        fStroked = isStrokeOnly && params.fInnerXRadius > 0 && params.fInnerYRadius > 0;
        fViewMatrixIfUsingLocalCoords = viewMatrix;
    }

Member Function Documentation

finalize()

GrProcessorSet::Analysis EllipseOp::finalize ( const GrCaps &  , const GrAppliedClip *  , GrClampType    )

inlineoverridevirtual

This is called after the GrAppliedClip has been computed and just prior to recording the op or combining it with a previously recorded op. The op should convert any proxies or resources it owns to "pending io" status so that resource allocation can be more optimal. Additionally, at this time the op must report whether a copy of the destination (or destination texture itself) needs to be provided to the GrXferProcessor when this op executes.

Implements GrDrawOp.

Definition at line 1946 of file GrOvalOpFactory.cpp.

                                                                      {
        fUseScale = !caps.shaderCaps()->fFloatIs32Bits &&
                    !caps.shaderCaps()->fHasLowFragmentPrecision;
        SkPMColor4f* color = &fEllipses.front().fColor;
        return fHelper.finalizeProcessors(caps, clip, clampType,
                                          GrProcessorAnalysisCoverage::kSingleChannel, color,
                                          &fWideColor);
    }

fixedFunctionFlags()

FixedFunctionFlags EllipseOp::fixedFunctionFlags ( ) const

inlineoverridevirtual

Reimplemented from GrDrawOp.

Definition at line 1956 of file GrOvalOpFactory.cpp.

{ return fHelper.fixedFunctionFlags(); }

Make()

static DEFINE_OP_CLASS_ID GrOp::Owner EllipseOp::Make ( GrRecordingContext *  context, GrPaint &&  paint, const SkMatrix &  viewMatrix, const SkRect &  ellipse, const SkStrokeRec &  stroke  )

inlinestatic

Definition at line 1836 of file GrOvalOpFactory.cpp.

                                                       {
        DeviceSpaceParams params;
        // do any matrix crunching before we reset the draw state for device coords
        params.fCenter = SkPoint::Make(ellipse.centerX(), ellipse.centerY());
        viewMatrix.mapPoints(&params.fCenter, 1);
        SkScalar ellipseXRadius = SkScalarHalf(ellipse.width());
        SkScalar ellipseYRadius = SkScalarHalf(ellipse.height());
        params.fXRadius = SkScalarAbs(viewMatrix[SkMatrix::kMScaleX] * ellipseXRadius +
                                      viewMatrix[SkMatrix::kMSkewX] * ellipseYRadius);
        params.fYRadius = SkScalarAbs(viewMatrix[SkMatrix::kMSkewY] * ellipseXRadius +
                                      viewMatrix[SkMatrix::kMScaleY] * ellipseYRadius);
 
        // do (potentially) anisotropic mapping of stroke
        SkVector scaledStroke;
        SkScalar strokeWidth = stroke.getWidth();
        scaledStroke.fX = SkScalarAbs(
                strokeWidth * (viewMatrix[SkMatrix::kMScaleX] + viewMatrix[SkMatrix::kMSkewY]));
        scaledStroke.fY = SkScalarAbs(
                strokeWidth * (viewMatrix[SkMatrix::kMSkewX] + viewMatrix[SkMatrix::kMScaleY]));
 
        SkStrokeRec::Style style = stroke.getStyle();
        bool isStrokeOnly =
                SkStrokeRec::kStroke_Style == style || SkStrokeRec::kHairline_Style == style;
        bool hasStroke = isStrokeOnly || SkStrokeRec::kStrokeAndFill_Style == style;
 
        params.fInnerXRadius = 0;
        params.fInnerYRadius = 0;
        if (hasStroke) {
            if (SkScalarNearlyZero(scaledStroke.length())) {
                scaledStroke.set(SK_ScalarHalf, SK_ScalarHalf);
            } else {
                scaledStroke.scale(SK_ScalarHalf);
            }
 
            // we only handle thick strokes for near-circular ellipses
            if (scaledStroke.length() > SK_ScalarHalf &&
                (0.5f * params.fXRadius > params.fYRadius ||
                 0.5f * params.fYRadius > params.fXRadius)) {
                return nullptr;
            }
 
            // we don't handle it if curvature of the stroke is less than curvature of the ellipse
            if (scaledStroke.fX * (params.fXRadius * params.fYRadius) <
                        (scaledStroke.fY * scaledStroke.fY) * params.fXRadius ||
                scaledStroke.fY * (params.fXRadius * params.fXRadius) <
                        (scaledStroke.fX * scaledStroke.fX) * params.fYRadius) {
                return nullptr;
            }
 
            // this is legit only if scale & translation (which should be the case at the moment)
            if (isStrokeOnly) {
                params.fInnerXRadius = params.fXRadius - scaledStroke.fX;
                params.fInnerYRadius = params.fYRadius - scaledStroke.fY;
            }
 
            params.fXRadius += scaledStroke.fX;
            params.fYRadius += scaledStroke.fY;
        }
 
        // For large ovals with low precision floats, we fall back to the path renderer.
        // To compute the AA at the edge we divide by the gradient, which is clamped to a
        // minimum value to avoid divides by zero. With large ovals and low precision this
        // leads to blurring at the edge of the oval.
        const SkScalar kMaxOvalRadius = 16384;
        if (!context->priv().caps()->shaderCaps()->fFloatIs32Bits &&
            (params.fXRadius >= kMaxOvalRadius || params.fYRadius >= kMaxOvalRadius)) {
            return nullptr;
        }
 
        return Helper::FactoryHelper<EllipseOp>(context, std::move(paint), viewMatrix,
                                                params, stroke);
    }

name()

const char * EllipseOp::name ( ) const

inlineoverridevirtual

Implements GrOp.

Definition at line 1936 of file GrOvalOpFactory.cpp.

{ return "EllipseOp"; }

onCombineIfPossible()

CombineResult EllipseOp::onCombineIfPossible ( GrOp *  t, SkArenaAlloc *  , const GrCaps &  caps  )

inlineoverrideprivatevirtual

Reimplemented from GrOp.

Definition at line 2051 of file GrOvalOpFactory.cpp.

                                                                                           {
        EllipseOp* that = t->cast<EllipseOp>();
 
        if (!fHelper.isCompatible(that->fHelper, caps, this->bounds(), that->bounds())) {
            return CombineResult::kCannotCombine;
        }
 
        if (fStroked != that->fStroked) {
            return CombineResult::kCannotCombine;
        }
 
        if (fHelper.usesLocalCoords() &&
            !SkMatrixPriv::CheapEqual(fViewMatrixIfUsingLocalCoords,
                                      that->fViewMatrixIfUsingLocalCoords)) {
            return CombineResult::kCannotCombine;
        }
 
        fEllipses.push_back_n(that->fEllipses.size(), that->fEllipses.begin());
        fWideColor |= that->fWideColor;
        return CombineResult::kMerged;
    }

onCreateProgramInfo()

void EllipseOp::onCreateProgramInfo ( const GrCaps *  caps, SkArenaAlloc *  arena, const GrSurfaceProxyView &  writeView, bool  usesMSAASurface, GrAppliedClip &&  appliedClip, const GrDstProxyView &  dstProxyView, GrXferBarrierFlags  renderPassXferBarriers, GrLoadOp  colorLoadOp  )

inlineoverrideprivatevirtual

Implements GrMeshDrawOp.

Definition at line 1961 of file GrOvalOpFactory.cpp.

                                                            {
        SkMatrix localMatrix;
        if (!fViewMatrixIfUsingLocalCoords.invert(&localMatrix)) {
            return;
        }
 
        GrGeometryProcessor* gp = EllipseGeometryProcessor::Make(arena, fStroked, fWideColor,
                                                                 fUseScale, localMatrix);
 
        fProgramInfo = fHelper.createProgramInfo(caps,
                                                 arena,
                                                 writeView,
                                                 usesMSAASurface,
                                                 std::move(appliedClip),
                                                 dstProxyView,
                                                 gp,
                                                 GrPrimitiveType::kTriangles,
                                                 renderPassXferBarriers,
                                                 colorLoadOp);
    }

onExecute()

void EllipseOp::onExecute ( GrOpFlushState *  flushState, const SkRect &  chainBounds  )

inlineoverrideprivatevirtual

Implements GrOp.

Definition at line 2041 of file GrOvalOpFactory.cpp.

                                                                                   {
        if (!fProgramInfo || !fMesh) {
            return;
        }
 
        flushState->bindPipelineAndScissorClip(*fProgramInfo, chainBounds);
        flushState->bindTextures(fProgramInfo->geomProc(), nullptr, fProgramInfo->pipeline());
        flushState->drawMesh(*fMesh);
    }

onPrepareDraws()

void EllipseOp::onPrepareDraws ( GrMeshDrawTarget *  target )

inlineoverrideprivatevirtual

Implements GrMeshDrawOp.

Definition at line 1989 of file GrOvalOpFactory.cpp.

                                                           {
        if (!fProgramInfo) {
            this->createProgramInfo(target);
            if (!fProgramInfo) {
                return;
            }
        }
 
        QuadHelper helper(target, fProgramInfo->geomProc().vertexStride(), fEllipses.size());
        VertexWriter verts{helper.vertices()};
        if (!verts) {
            SkDebugf("Could not allocate vertices\n");
            return;
        }
 
        // On MSAA, bloat enough to guarantee any pixel that might be touched by the ellipse has
        // full sample coverage.
        float aaBloat = target->usesMSAASurface() ? SK_ScalarSqrt2 : .5f;
 
        for (const auto& ellipse : fEllipses) {
            VertexColor color(ellipse.fColor, fWideColor);
            SkScalar xRadius = ellipse.fXRadius;
            SkScalar yRadius = ellipse.fYRadius;
 
            // Compute the reciprocals of the radii here to save time in the shader
            struct { float xOuter, yOuter, xInner, yInner; } invRadii = {
                SkScalarInvert(xRadius),
                SkScalarInvert(yRadius),
                sk_ieee_float_divide(1.0f, ellipse.fInnerXRadius),
                sk_ieee_float_divide(1.0f, ellipse.fInnerYRadius)
            };
            SkScalar xMaxOffset = xRadius + aaBloat;
            SkScalar yMaxOffset = yRadius + aaBloat;
 
            if (!fStroked) {
                // For filled ellipses we map a unit circle in the vertex attributes rather than
                // computing an ellipse and modifying that distance, so we normalize to 1
                xMaxOffset /= xRadius;
                yMaxOffset /= yRadius;
            }
 
            // The inner radius in the vertex data must be specified in normalized space.
            verts.writeQuad(VertexWriter::TriStripFromRect(
                                    ellipse.fDevBounds.makeOutset(aaBloat, aaBloat)),
                            color,
                            origin_centered_tri_strip(xMaxOffset, yMaxOffset),
                            VertexWriter::If(fUseScale, std::max(xRadius, yRadius)),
                            invRadii);
        }
        fMesh = helper.mesh();
    }

programInfo()

GrProgramInfo * EllipseOp::programInfo ( )

inlineoverrideprivatevirtual

Implements GrMeshDrawOp.

Definition at line 1959 of file GrOvalOpFactory.cpp.

{ return fProgramInfo; }

visitProxies()

void EllipseOp::visitProxies ( const GrVisitProxyFunc &  func ) const

inlineoverridevirtual

Reimplemented from GrOp.

Definition at line 1938 of file GrOvalOpFactory.cpp.

                                                                   {
        if (fProgramInfo) {
            fProgramInfo->visitFPProxies(func);
        } else {
            fHelper.visitProxies(func);
        }
    }

---

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

• third_party/skia/src/gpu/ganesh/ops/GrOvalOpFactory.cpp