SkDrawable Class Reference

#include <SkDrawable.h>

Inheritance diagram for SkDrawable:

Classes
class	GpuDrawHandler

Public Member Functions
void	draw (SkCanvas *, const SkMatrix *=nullptr)
void	draw (SkCanvas *, SkScalar x, SkScalar y)
std::unique_ptr< GpuDrawHandler >	snapGpuDrawHandler (GrBackendApi backendApi, const SkMatrix &matrix, const SkIRect &clipBounds, const SkImageInfo &bufferInfo)
sk_sp< SkPicture >	makePictureSnapshot ()
uint32_t	getGenerationID ()
SkRect	getBounds ()
size_t	approximateBytesUsed ()
void	notifyDrawingChanged ()
SkFlattenable::Type	getFlattenableType () const override
Factory	getFactory () const override
const char *	getTypeName () const override
Public Member Functions inherited from SkFlattenable
	SkFlattenable ()
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

Static Public Member Functions
static SkFlattenable::Type	GetFlattenableType ()
static sk_sp< SkDrawable >	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 Member Functions
	SkDrawable ()
virtual SkRect	onGetBounds ()=0
virtual size_t	onApproximateBytesUsed ()
virtual void	onDraw (SkCanvas *)=0
virtual std::unique_ptr< GpuDrawHandler >	onSnapGpuDrawHandler (GrBackendApi, const SkMatrix &, const SkIRect &, const SkImageInfo &)
virtual std::unique_ptr< GpuDrawHandler >	onSnapGpuDrawHandler (GrBackendApi, const SkMatrix &)
virtual sk_sp< SkPicture >	onMakePictureSnapshot ()

Additional Inherited Members
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 &)

Detailed Description

Base-class for objects that draw into SkCanvas.

The object has a generation ID, which is guaranteed to be unique across all drawables. To allow for clients of the drawable that may want to cache the results, the drawable must change its generation ID whenever its internal state changes such that it will draw differently.

Definition at line 37 of file SkDrawable.h.

Constructor & Destructor Documentation

SkDrawable()

SkDrawable::SkDrawable ( )

protected

Definition at line 32 of file SkDrawable.cpp.

: fGenerationID(0) {}

Member Function Documentation

approximateBytesUsed()

size_t SkDrawable::approximateBytesUsed

(

)

Return approximately how many bytes would be freed if this drawable is destroyed. The base implementation returns 0 to indicate that this is unknown.

Definition at line 75 of file SkDrawable.cpp.

                                        {
    return this->onApproximateBytesUsed();
}

Deserialize()

static sk_sp< SkDrawable > SkDrawable::Deserialize ( const void *  data, size_t  size, const SkDeserialProcs *  procs = nullptr  )

inlinestatic

Definition at line 138 of file SkDrawable.h.

                                                                                  {
        return sk_sp<SkDrawable>(static_cast<SkDrawable*>(
                                  SkFlattenable::Deserialize(
                                  kSkDrawable_Type, data, size, procs).release()));
    }

draw() [1/2]

void SkDrawable::draw	(	SkCanvas *	canvas,
		const SkMatrix *	matrix = nullptr
	)

Draws into the specified content. The drawing sequence will be balanced upon return (i.e. the saveLevel() on the canvas will match what it was when draw() was called, and the current matrix and clip settings will not be changed.

Definition at line 43 of file SkDrawable.cpp.

                                                              {
    SkAutoCanvasRestore acr(canvas, true);
    if (matrix) {
        canvas->concat(*matrix);
    }
    this->onDraw(canvas);
 
    if ((false)) {
        draw_bbox(canvas, this->getBounds());
    }
}

draw() [2/2]

void SkDrawable::draw	(	SkCanvas *	canvas,
		SkScalar	x,
		SkScalar	y
	)

Definition at line 55 of file SkDrawable.cpp.

                                                              {
    SkMatrix matrix = SkMatrix::Translate(x, y);
    this->draw(canvas, &matrix);
}

getBounds()

SkRect SkDrawable::getBounds

(

)

Return the (conservative) bounds of what the drawable will draw. If the drawable can change what it draws (e.g. animation or in response to some external change), then this must return a bounds that is always valid for all possible states.

Definition at line 71 of file SkDrawable.cpp.

                             {
    return this->onGetBounds();
}

getFactory()

Factory SkDrawable::getFactory ( ) const

inlineoverridevirtual

Implement this to return a factory function pointer that can be called to recreate your class given a buffer (previously written to by your override of flatten().

Implements SkFlattenable.

Definition at line 145 of file SkDrawable.h.

{ return nullptr; }

GetFlattenableType()

static SkFlattenable::Type SkDrawable::GetFlattenableType ( )

inlinestatic

Definition at line 130 of file SkDrawable.h.

                                                  {
        return kSkDrawable_Type;
    }

getFlattenableType()

SkFlattenable::Type SkDrawable::getFlattenableType ( ) const

inlineoverridevirtual

Implements SkFlattenable.

Definition at line 134 of file SkDrawable.h.

                                                          {
        return kSkDrawable_Type;
    }

getGenerationID()

uint32_t SkDrawable::getGenerationID

(

)

Return a unique value for this instance. If two calls to this return the same value, it is presumed that calling the draw() method will render the same thing as well.

Subclasses that change their state should call notifyDrawingChanged() to ensure that a new value will be returned the next time it is called.

Definition at line 64 of file SkDrawable.cpp.

                                     {
    if (0 == fGenerationID) {
        fGenerationID = next_generation_id();
    }
    return fGenerationID;
}

getTypeName()

const char * SkDrawable::getTypeName ( ) const

inlineoverridevirtual

Returns the name of the object's class.

Implements SkFlattenable.

Definition at line 146 of file SkDrawable.h.

{ return nullptr; }

makePictureSnapshot()

sk_sp< SkPicture > SkDrawable::makePictureSnapshot

(

)

Returns an SkPicture with the contents of this SkDrawable.

Definition at line 60 of file SkDrawable.cpp.

                                                 {
    return this->onMakePictureSnapshot();
}

notifyDrawingChanged()

void SkDrawable::notifyDrawingChanged

(

)

Calling this invalidates the previous generation ID, and causes a new one to be computed the next time getGenerationID() is called. Typically this is called by the object itself, in response to its internal state changing.

Definition at line 82 of file SkDrawable.cpp.

                                      {
    fGenerationID = 0;
}

onApproximateBytesUsed()

size_t SkDrawable::onApproximateBytesUsed ( )

protectedvirtual

Reimplemented in SkPictureBackedGlyphDrawable, and SkRecordedDrawable.

Definition at line 78 of file SkDrawable.cpp.

                                          {
    return 0;
}

onDraw()

virtual void SkDrawable::onDraw ( SkCanvas *  )

protectedpure virtual

Implemented in SkAnimatedImage, IntDrawable, PaintDrawable, CompoundDrawable, RootDrawable, MyDrawable, SkPictureBackedGlyphDrawable, SkRecordedDrawable, DrawAtlasDrawable, and CircDrawable.

onGetBounds()

virtual SkRect SkDrawable::onGetBounds ( )

protectedpure virtual

Implemented in MyDrawable, SkAnimatedImage, SkPictureBackedGlyphDrawable, SkRecordedDrawable, IntDrawable, PaintDrawable, CompoundDrawable, RootDrawable, DrawAtlasDrawable, and CircDrawable.

onMakePictureSnapshot()

sk_sp< SkPicture > SkDrawable::onMakePictureSnapshot ( )

protectedvirtual

Default implementation calls onDraw() with a canvas that records into a picture. Subclasses may override if they have a more efficient way to return a picture for the current state of their drawable. Note: this picture must draw the same as what would be drawn from onDraw().

Reimplemented in SkRecordedDrawable.

Definition at line 88 of file SkDrawable.cpp.

                                                   {
    SkPictureRecorder recorder;
 
    const SkRect bounds = this->getBounds();
    SkCanvas* canvas = recorder.beginRecording(bounds);
    this->draw(canvas);
    if ((false)) {
        draw_bbox(canvas, bounds);
    }
    return recorder.finishRecordingAsPicture();
}

onSnapGpuDrawHandler() [1/2]

virtual std::unique_ptr< GpuDrawHandler > SkDrawable::onSnapGpuDrawHandler ( GrBackendApi  , const SkMatrix &    )

inlineprotectedvirtual

Definition at line 162 of file SkDrawable.h.

                                                                                              {
        return nullptr;
    }

onSnapGpuDrawHandler() [2/2]

virtual std::unique_ptr< GpuDrawHandler > SkDrawable::onSnapGpuDrawHandler ( GrBackendApi  , const SkMatrix &  , const SkIRect &  , const SkImageInfo &    )

inlineprotectedvirtual

Definition at line 155 of file SkDrawable.h.

                                                                                     {
        return nullptr;
    }

snapGpuDrawHandler()

std::unique_ptr< GpuDrawHandler > SkDrawable::snapGpuDrawHandler ( GrBackendApi  backendApi, const SkMatrix &  matrix, const SkIRect &  clipBounds, const SkImageInfo &  bufferInfo  )

inline

Snaps off a GpuDrawHandler to represent the state of the SkDrawable at the time the snap is called. This is used for executing GPU backend specific draws intermixed with normal Skia GPU draws. The GPU API, which will be used for the draw, as well as the full matrix, device clip bounds and imageInfo of the target buffer are passed in as inputs.

Definition at line 89 of file SkDrawable.h.

                                                                                      {
        return this->onSnapGpuDrawHandler(backendApi, matrix, clipBounds, bufferInfo);
    }

---

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

• third_party/skia/include/core/SkDrawable.h
• third_party/skia/src/core/SkDrawable.cpp