1 // Adds compile-time JS functions to augment the CanvasKit interface. 2 // Specifically, anything that should only be on the Skottie builds of canvaskit. 3 4 5 CanvasKit.MakeManagedAnimation = function(json, assets) { 6 if (!CanvasKit._MakeManagedAnimation) { 7 throw 'Not compiled with MakeManagedAnimation'; 8 } 9 if (!assets) { 10 return CanvasKit._MakeManagedAnimation(json, 0, nullptr, nullptr, nullptr); 11 } 12 var assetNamePtrs = []; 13 var assetDataPtrs = []; 14 var assetSizes = []; 15 16 var assetKeys = Object.keys(assets || {}); 17 for (var i = 0; i < assetKeys.length; i++) { 18 var key = assetKeys[i]; 19 var buffer = assets[key]; 20 var data = new Uint8Array(buffer); 21 22 var iptr = CanvasKit._malloc(data.byteLength); 23 CanvasKit.HEAPU8.set(data, iptr); 24 assetDataPtrs.push(iptr); 25 assetSizes.push(data.byteLength); 26 27 // lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten 28 // JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8 29 // Add 1 for null terminator 30 var strLen = lengthBytesUTF8(key) + 1; 31 var strPtr = CanvasKit._malloc(strLen); 32 33 stringToUTF8(key, strPtr, strLen); 34 assetNamePtrs.push(strPtr); 35 } 36 37 // Not entirely sure if it matters, but the uintptr_t are 32 bits 38 // we want to copy our array of uintptr_t into the right size memory. 39 var namesPtr = copy1dArray(assetNamePtrs, CanvasKit.HEAPU32); 40 var assetsPtr = copy1dArray(assetDataPtrs, CanvasKit.HEAPU32); 41 var assetSizesPtr = copy1dArray(assetSizes, CanvasKit.HEAPU32); 42 43 var anim = CanvasKit._MakeManagedAnimation(json, assetKeys.length, namesPtr, 44 assetsPtr, assetSizesPtr); 45 46 // We leave the asset data arrays and string data live and assume 47 // it is now owned by the C++ code 48 CanvasKit._free(namesPtr); 49 CanvasKit._free(assetsPtr); 50 CanvasKit._free(assetSizesPtr); 51 52 return anim; 53 }; 54
