JSSpan< T > Class Template Reference

#include <WasmCommon.h>

Public Member Functions
	JSSpan (JSArray src)
	JSSpan (WASMPointer ptr, size_t len, bool takeOwnership)
	~JSSpan ()
const T *	data () const
size_t	size () const

Detailed Description

template<typename T>
class JSSpan< T >

Gives read access to a JSArray

We explicitly use malloc/free (not new/delete) so this can be used with allocations from the JS side (ala CanvasKit.Malloc).

Definition at line 89 of file WasmCommon.h.

Constructor & Destructor Documentation

JSSpan() [1/2]

template<typename T >

JSSpan< T >::JSSpan ( JSArray  src )

inline

Definition at line 93 of file WasmCommon.h.

                        {
        const size_t len = src["length"].as<size_t>();
        T* data;
 
        // If the buffer was allocated via CanvasKit' Malloc, we can peek directly at it!
        if (src["_ck"].isTrue()) {
            fOwned = false;
            data = reinterpret_cast<T*>(src["byteOffset"].as<size_t>());
        } else {
            fOwned = true;
            data = static_cast<T*>(sk_malloc_throw(len, sizeof(T)));
 
            // now actually copy into 'data'
            if (src.instanceof(emscripten::val::global(JSArrayType<T>::gName))) {
                auto dst_view = emscripten::val(typed_memory_view(len, data));
                dst_view.call<void>("set", src);
            } else {
                for (size_t i = 0; i < len; ++i) {
                    data[i] = src[i].as<T>();
                }
            }
        }
        fSpan = SkSpan(data, len);
    }

JSSpan() [2/2]

template<typename T >

JSSpan< T >::JSSpan ( WASMPointer  ptr, size_t  len, bool  takeOwnership  )

inline

Definition at line 118 of file WasmCommon.h.

                                                           : fOwned(takeOwnership) {
        fSpan = SkSpan(reinterpret_cast<T*>(ptr), len);
    }

~JSSpan()

template<typename T >

JSSpan< T >::~JSSpan ( )

inline

Definition at line 122 of file WasmCommon.h.

              {
        if (fOwned) {
            sk_free(fSpan.data());
        }
    }

Member Function Documentation

data()

template<typename T >

const T * JSSpan< T >::data ( ) const

inline

Definition at line 128 of file WasmCommon.h.

{ return fSpan.data(); }

size()

template<typename T >

size_t JSSpan< T >::size ( ) const

inline

Definition at line 129 of file WasmCommon.h.

{ return fSpan.size(); }

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

• third_party/skia/modules/canvaskit/WasmCommon.h