SkPicture Reference === --- 
class SkPicture : public SkRefCnt {

    static sk_sp<SkPicture> MakeFromStream(SkStream* stream,
                                           const SkDeserialProcs* procs = nullptr);
    static sk_sp<SkPicture> MakeFromData(const SkData* data,
                                         const SkDeserialProcs* procs = nullptr);
    static sk_sp<SkPicture> MakeFromData(const void* data, size_t size,
                                         const SkDeserialProcs* procs = nullptr);
    virtual void playback(SkCanvas* canvas, AbortCallback* callback = nullptr) const = 0;
    virtual SkRect cullRect() const = 0;
    uint32_t uniqueID() const;
    sk_sp<SkData> serialize(const SkSerialProcs* procs = nullptr) const;
    void serialize(SkWStream* stream, const SkSerialProcs* procs = nullptr) const;
    static sk_sp<SkPicture> MakePlaceholder(SkRect cull);
    virtual int approximateOpCount() const = 0;
    virtual size_t approximateBytesUsed() const = 0;
};
Picture records drawing commands made to Canvas. The command stream may be played in whole or in part at a later time. Picture is an abstract class. Picture may be generated by Picture_Recorder or Drawable, or from Picture previously saved to Data or Stream. Picture may contain any Canvas drawing command, as well as one or more Canvas_Matrix or Canvas_Clip. Picture has a cull Rect, which is used as a bounding box hint. To limit Picture bounds, use Canvas_Clip when recording or drawing Picture. --- 
    class AbortCallback {
    public:
        AbortCallback() {}
        virtual ~AbortCallback() {}
        virtual bool abort() = 0;
    };
AbortCallback is an abstract class. An implementation of AbortCallback may passed as a parameter to SkPicture::playback, to stop it before all drawing commands have been processed. If AbortCallback::abort returns true, SkPicture::playback is interrupted. --- 
AbortCallback()
Has no effect. ### Return Value abstract class cannot be instantiated ### See Also playback --- 
virtual ~AbortCallback()
Has no effect. ### See Also playback --- 
virtual bool abort() = 0
Stops SkPicture playback when some condition is met. A subclass of AbortCallback provides an override for abort() that can stop SkPicture::playback. The part of SkPicture drawn when aborted is undefined. SkPicture instantiations are free to stop drawing at different points during playback. If the abort happens inside one or more calls to SkCanvas::save(), stack of SkCanvas matrix and SkCanvas clip values is restored to its state before SkPicture::playback was called. ### Return Value true to stop playback ### See Also playback ### Example
JustOneDraw allows the black rectangle to draw but stops playback before the white rectangle appears.
--- 
static sk_sp<SkPicture> MakeFromStream(SkStream* stream, const SkDeserialProcs* procs = nullptr)
Recreates SkPicture that was serialized into a stream. Returns constructed SkPicture if successful; otherwise, returns nullptr. Fails if data does not permit constructing valid SkPicture. procs->fPictureProc permits supplying a custom function to decode SkPicture. If procs->fPictureProc is nullptr, default decoding is used. procs->fPictureCtx may be used to provide user context to procs->fPictureProc; procs->fPictureProc is called with a pointer to data, data byte length, and user context. ### Parameters
stream container for serial data
procs custom serial data decoders; may be nullptr
### Return Value SkPicture constructed from stream data ### Example
### See Also MakeFromData SkPictureRecorder --- 
static sk_sp<SkPicture> MakeFromData(const SkData* data, const SkDeserialProcs* procs = nullptr)
Recreates SkPicture that was serialized into data. Returns constructed SkPicture if successful; otherwise, returns nullptr. Fails if data does not permit constructing valid SkPicture. procs->fPictureProc permits supplying a custom function to decode SkPicture. If procs->fPictureProc is nullptr, default decoding is used. procs->fPictureCtx may be used to provide user context to procs->fPictureProc; procs->fPictureProc is called with a pointer to data, data byte length, and user context. ### Parameters
data container for serial data
procs custom serial data decoders; may be nullptr
### Return Value SkPicture constructed from data ### Example
### See Also MakeFromStream SkPictureRecorder --- 
static sk_sp<SkPicture> MakeFromData(const void* data, size_t size,
                                     const SkDeserialProcs* procs = nullptr)
### Parameters
data pointer to serial data
size size of data
procs custom serial data decoders; may be nullptr
### Return Value SkPicture constructed from data ### Example
### See Also MakeFromStream SkPictureRecorder --- 
virtual void playback(SkCanvas* canvas, AbortCallback* callback = nullptr) const = 0
Replays the drawing commands on the specified canvas. In the case that the commands are recorded, each command in the SkPicture is sent separately to canvas. To add a single command to draw SkPicture to recording canvas, call SkCanvas::drawPicture instead. ### Parameters
canvas receiver of drawing commands
callback allows interruption of playback
### Example
### See Also SkCanvas::drawPicture --- 
virtual SkRect cullRect() const = 0
Returns cull SkRect for this picture, passed in when SkPicture was created. Returned SkRect does not specify clipping SkRect for SkPicture; cull is hint of SkPicture bounds. SkPicture is free to discard recorded drawing commands that fall outside cull. ### Return Value bounds passed when SkPicture was created ### Example
Picture recorded bounds are smaller than contents; contents outside recorded bounds may be drawn, and are drawn in this example.
### See Also SkCanvas::clipRect --- 
uint32_t uniqueID()const
Returns a non-zero value unique among SkPicture in Skia process. ### Return Value identifier for SkPicture ### Example
#### Example Output ~~~~ empty picture id = 1 placeholder id = 2 ~~~~
### See Also SkRefCnt --- 
sk_sp<SkData> serialize(const SkSerialProcs* procs = nullptr)const
Returns storage containing SkData describing SkPicture, using optional custom encoders. procs->fPictureProc permits supplying a custom function to encode SkPicture. If procs->fPictureProc is nullptr, default encoding is used. procs->fPictureCtx may be used to provide user context to procs->fPictureProc; procs->fPictureProc is called with a pointer to SkPicture and user context. ### Parameters
procs custom serial data encoders; may be nullptr
### Return Value storage containing serialized SkPicture ### Example
### See Also MakeFromData SkData SkSerialProcs --- 
void serialize(SkWStream* stream, const SkSerialProcs* procs = nullptr)const
Writes picture to stream, using optional custom encoders. procs->fPictureProc permits supplying a custom function to encode SkPicture. If procs->fPictureProc is nullptr, default encoding is used. procs->fPictureCtx may be used to provide user context to procs->fPictureProc; procs->fPictureProc is called with a pointer to SkPicture and user context. ### Parameters
stream writable serial data stream
procs custom serial data encoders; may be nullptr
### Example
### See Also MakeFromStream SkWStream SkSerialProcs --- 
static sk_sp<SkPicture> MakePlaceholder(SkRect cull)
Returns a placeholder SkPicture. Result does not draw, and contains only cull SkRect, a hint of its bounds. Result is immutable; it cannot be changed later. Result identifier is unique. Returned placeholder can be intercepted during playback to insert other commands into SkCanvas draw stream. ### Parameters
cull placeholder dimensions
### Return Value placeholder with unique identifier ### Example
### See Also MakeFromStream MakeFromData uniqueID --- 
virtual int approximateOpCount() const = 0
Returns the approximate number of operations in SkPicture. Returned value may be greater or less than the number of SkCanvas calls recorded: some calls may be recorded as more than one operation, other calls may be optimized away. ### Return Value approximate operation count ### Example
### See Also approximateBytesUsed --- 
virtual size_t approximateBytesUsed() const = 0
Returns the approximate byte size of SkPicture. Does not include large objects referenced by SkPicture. ### Return Value approximate size ### Example
### See Also approximateOpCount