blob: 74ef1ad182937c59b267d0659b3c8543d97c114c [file] [log] [blame]
// Adds compile-time JS functions to augment the CanvasKit interface.
// Specifically, anything that should only be on the Particle builds of canvaskit.
// assets is a dictionary of named blobs: { key: ArrayBuffer, ... }
// The keys should be well-behaved strings - they're turned into null-terminated
// strings for the native side.
CanvasKit.MakeParticles = function(json, assets) {
if (!CanvasKit._MakeParticles) {
throw 'Not compiled with MakeParticles';
}
if (!assets) {
return CanvasKit._MakeParticles(json, 0, nullptr, nullptr, nullptr);
}
var assetNamePtrs = [];
var assetDataPtrs = [];
var assetSizes = [];
var assetKeys = Object.keys(assets || {});
for (var i = 0; i < assetKeys.length; i++) {
var key = assetKeys[i];
var buffer = assets[key];
var data = new Uint8Array(buffer);
var iptr = CanvasKit._malloc(data.byteLength);
CanvasKit.HEAPU8.set(data, iptr);
assetDataPtrs.push(iptr);
assetSizes.push(data.byteLength);
// lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten
// JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8
// Add 1 for null terminator
var strLen = lengthBytesUTF8(key) + 1;
var strPtr = CanvasKit._malloc(strLen);
stringToUTF8(key, strPtr, strLen);
assetNamePtrs.push(strPtr);
}
// Not entirely sure if it matters, but the uintptr_t are 32 bits
// we want to copy our array of uintptr_t into the right size memory.
var namesPtr = copy1dArray(assetNamePtrs, "HEAPU32");
var assetsPtr = copy1dArray(assetDataPtrs, "HEAPU32");
var assetSizesPtr = copy1dArray(assetSizes, "HEAPU32");
var particles = CanvasKit._MakeParticles(json, assetKeys.length,
namesPtr, assetsPtr, assetSizesPtr);
// The C++ code has made copies of the asset and string data, so free our copies.
CanvasKit._free(namesPtr);
CanvasKit._free(assetsPtr);
CanvasKit._free(assetSizesPtr);
return particles;
};
CanvasKit._extraInitializations = CanvasKit._extraInitializations || [];
CanvasKit._extraInitializations.push(function() {
CanvasKit.ParticleEffect.prototype.uniforms = function() {
var fptr = this._uniformPtr();
var numFloats = this.getUniformFloatCount();
if (!fptr || numFloats <= 0) {
return new Float32Array();
}
return new Float32Array(CanvasKit.HEAPU8.buffer, fptr, numFloats);
};
CanvasKit.ParticleEffect.prototype.setPosition = function(pos) {
this._setPosition(pos[0], pos[1]);
};
});