sktext::gpu::SDFMaskFilterImpl Class Reference

Inheritance diagram for sktext::gpu::SDFMaskFilterImpl:

Public Member Functions
	SDFMaskFilterImpl ()
SkMask::Format	getFormat () const override
bool	filterMask (SkMaskBuilder *dst, const SkMask &src, const SkMatrix &, SkIPoint *margin) const override
SkMaskFilterBase::Type	type () const override
void	computeFastBounds (const SkRect &, SkRect *) const override
Public Member Functions inherited from SkMaskFilterBase
virtual bool	asABlur (BlurRec *) const
virtual sk_sp< SkImageFilter >	asImageFilter (const SkMatrix &ctm) const
SkFlattenable::Type	getFlattenableType () const override
Public Member Functions inherited from SkMaskFilter
SkRect	approximateFilteredBounds (const SkRect &src) const
Public Member Functions inherited from SkFlattenable
	SkFlattenable ()
virtual Factory	getFactory () const =0
virtual const char *	getTypeName () const =0
virtual void	flatten (SkWriteBuffer &) const
sk_sp< SkData >	serialize (const SkSerialProcs *=nullptr) const
size_t	serialize (void *memory, size_t memory_size, const SkSerialProcs *=nullptr) const
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Additional Inherited Members
Public Types inherited from SkMaskFilterBase
enum class	Type {   kBlur , kEmboss , kSDF , kShader ,   kTable }
Public Types inherited from SkFlattenable
enum	Type {   kSkColorFilter_Type , kSkBlender_Type , kSkDrawable_Type , kSkDrawLooper_Type ,   kSkImageFilter_Type , kSkMaskFilter_Type , kSkPathEffect_Type , kSkShader_Type }
typedef sk_sp< SkFlattenable >(*	Factory) (SkReadBuffer &)
Static Public Member Functions inherited from SkMaskFilterBase
static SkFlattenable::Type	GetFlattenableType ()
Static Public Member Functions inherited from SkMaskFilter
static sk_sp< SkMaskFilter >	MakeBlur (SkBlurStyle style, SkScalar sigma, bool respectCTM=true)
static sk_sp< SkMaskFilter >	Deserialize (const void *data, size_t size, const SkDeserialProcs *procs=nullptr)
Static Public Member Functions inherited from SkFlattenable
static Factory	NameToFactory (const char name[])
static const char *	FactoryToName (Factory)
static void	Register (const char name[], Factory)
static sk_sp< SkFlattenable >	Deserialize (Type, const void *data, size_t length, const SkDeserialProcs *procs=nullptr)
Protected Types inherited from SkMaskFilterBase
enum	FilterReturn { kFalse_FilterReturn , kTrue_FilterReturn , kUnimplemented_FilterReturn }
Protected Member Functions inherited from SkMaskFilterBase
	SkMaskFilterBase ()
virtual FilterReturn	filterRectsToNine (const SkRect[], int count, const SkMatrix &, const SkIRect &clipBounds, SkTLazy< NinePatch > *) const
virtual FilterReturn	filterRRectToNine (const SkRRect &, const SkMatrix &, const SkIRect &clipBounds, SkTLazy< NinePatch > *) const

Detailed Description

Definition at line 24 of file SDFMaskFilter.cpp.

Constructor & Destructor Documentation

SDFMaskFilterImpl()

sktext::gpu::SDFMaskFilterImpl::SDFMaskFilterImpl

(

)

Definition at line 43 of file SDFMaskFilter.cpp.

{}

Member Function Documentation

computeFastBounds()

void sktext::gpu::SDFMaskFilterImpl::computeFastBounds ( const SkRect &  src, SkRect *  dest  ) const

overridevirtual

The fast bounds function is used to enable the paint to be culled early in the drawing pipeline. This function accepts the current bounds of the paint as its src param and the filter adjust those bounds using its current mask and returns the result using the dest param. Callers are allowed to provide the same struct for both src and dest so each implementation must accommodate that behavior.

The default impl calls filterMask with the src mask having no image, but subclasses may override this if they can compute the rect faster.

Reimplemented from SkMaskFilterBase.

Definition at line 87 of file SDFMaskFilter.cpp.

                                                               {
    dst->setLTRB(src.fLeft  - SK_DistanceFieldPad, src.fTop    - SK_DistanceFieldPad,
                 src.fRight + SK_DistanceFieldPad, src.fBottom + SK_DistanceFieldPad);
}

filterMask()

bool sktext::gpu::SDFMaskFilterImpl::filterMask ( SkMaskBuilder *  dst, const SkMask &  src, const SkMatrix &  , SkIPoint *  margin  ) const

overridevirtual

Create a new mask by filter the src mask. If src.fImage == null, then do not allocate or create the dst image but do fill out the other fields in dstMask. If you do allocate a dst image, use SkMask::AllocImage() If this returns false, dst mask is ignored.

Parameters

dst	the result of the filter. If src.fImage == null, dst should not allocate its image
src	the original image to be filtered.
matrix	the CTM
margin	if not null, return the buffer dx/dy need when calculating the effect. Used when drawing a clipped object to know how much larger to allocate the src before applying the filter. If returning false, ignore this parameter.

Returns

true if the dst mask was correctly created.

Implements SkMaskFilterBase.

Definition at line 49 of file SDFMaskFilter.cpp.

                                                                                   {
    if (src.fFormat != SkMask::kA8_Format
        && src.fFormat != SkMask::kBW_Format
        && src.fFormat != SkMask::kLCD16_Format) {
        return false;
    }
 
    *dst = SkMaskBuilder::PrepareDestination(SK_DistanceFieldPad, SK_DistanceFieldPad, src);
    dst->format() = SkMask::kSDF_Format;
 
    if (margin) {
        margin->set(SK_DistanceFieldPad, SK_DistanceFieldPad);
    }
 
    if (src.fImage == nullptr) {
        return true;
    }
    if (dst->fImage == nullptr) {
        dst->bounds().setEmpty();
        return false;
    }
 
    if (src.fFormat == SkMask::kA8_Format) {
        return SkGenerateDistanceFieldFromA8Image(dst->image(), src.fImage,
                                                  src.fBounds.width(), src.fBounds.height(),
                                                  src.fRowBytes);
    } else if (src.fFormat == SkMask::kLCD16_Format) {
        return SkGenerateDistanceFieldFromLCD16Mask(dst->image(), src.fImage,
                                                     src.fBounds.width(), src.fBounds.height(),
                                                     src.fRowBytes);
    } else {
        return SkGenerateDistanceFieldFromBWImage(dst->image(), src.fImage,
                                                  src.fBounds.width(), src.fBounds.height(),
                                                  src.fRowBytes);
    }
}

getFormat()

SkMask::Format sktext::gpu::SDFMaskFilterImpl::getFormat ( ) const

overridevirtual

Returns the format of the resulting mask that this subclass will return when its filterMask() method is called.

Implements SkMaskFilterBase.

Definition at line 45 of file SDFMaskFilter.cpp.

                                                {
    return SkMask::kSDF_Format;
}

type()

SkMaskFilterBase::Type sktext::gpu::SDFMaskFilterImpl::type ( ) const

inlineoverridevirtual

Implements SkMaskFilterBase.

Definition at line 34 of file SDFMaskFilter.cpp.

{ return SkMaskFilterBase::Type::kSDF; }

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

• third_party/skia/src/text/gpu/SDFMaskFilter.cpp