| /* |
| * Copyright 2019 Google LLC |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef WasmCommon_DEFINED |
| #define WasmCommon_DEFINED |
| |
| #include <emscripten.h> |
| #include <emscripten/bind.h> |
| #include "include/core/SkColor.h" |
| #include "include/core/SkSpan.h" |
| |
| using namespace emscripten; |
| |
| // Self-documenting types |
| using JSArray = emscripten::val; |
| using JSObject = emscripten::val; |
| using JSString = emscripten::val; |
| using SkPathOrNull = emscripten::val; |
| using TypedArray = emscripten::val; |
| using Uint8Array = emscripten::val; |
| using Uint16Array = emscripten::val; |
| using Uint32Array = emscripten::val; |
| using Float32Array = emscripten::val; |
| |
| /** |
| * Create a typed-array (in the JS heap) and initialize it with the provided |
| * data (from the wasm heap). The caller is responsible for matching the type of data |
| * with the specified arrayType. |
| * |
| * TODO: can we specialize this on T and provide the correct string? |
| * e.g. T==uint8_t --> "Uint8Array" |
| */ |
| template <typename T> |
| TypedArray MakeTypedArray(int count, const T src[], const char arrayType[]) { |
| emscripten::val length = emscripten::val(count); |
| emscripten::val jarray = emscripten::val::global(arrayType).new_(count); |
| jarray.call<void>("set", val(typed_memory_view(count, src))); |
| return jarray; |
| } |
| |
| /** |
| * Gives read access to a JSArray |
| */ |
| template <typename T> class JSSpan { |
| public: |
| JSSpan(JSArray src, const char arrayType[]) { |
| 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 = new T[len]; |
| |
| // now actually copy into 'data' |
| if (src.instanceof(emscripten::val::global(arrayType))) { |
| 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() { |
| if (fOwned) { |
| delete[] fSpan.data(); |
| } |
| } |
| |
| const T* data() const { return fSpan.data(); } |
| size_t size() const { return fSpan.size(); } |
| |
| private: |
| SkSpan<T> fSpan; |
| bool fOwned; |
| }; |
| |
| #endif |