5feaeb24d0
Change-Id: I49043df9e8fdf9ac7f5b25164a1c577f3c569b94 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/365478 Reviewed-by: Brian Osman <brianosman@google.com>
72 lines
2.5 KiB
JavaScript
72 lines
2.5 KiB
JavaScript
// Adds compile-time JS functions to augment the CanvasKit interface.
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// Specifically, anything that should only be on the Particle builds of canvaskit.
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// assets is a dictionary of named blobs: { key: ArrayBuffer, ... }
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// The keys should be well-behaved strings - they're turned into null-terminated
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// strings for the native side.
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CanvasKit.MakeParticles = function(json, assets) {
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if (!CanvasKit._MakeParticles) {
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throw 'Not compiled with MakeParticles';
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}
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if (!assets) {
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return CanvasKit._MakeParticles(json, 0, nullptr, nullptr, nullptr);
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}
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var assetNamePtrs = [];
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var assetDataPtrs = [];
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var assetSizes = [];
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var assetKeys = Object.keys(assets || {});
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for (var i = 0; i < assetKeys.length; i++) {
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var key = assetKeys[i];
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var buffer = assets[key];
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var data = new Uint8Array(buffer);
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var iptr = CanvasKit._malloc(data.byteLength);
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CanvasKit.HEAPU8.set(data, iptr);
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assetDataPtrs.push(iptr);
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assetSizes.push(data.byteLength);
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// lengthBytesUTF8 and stringToUTF8Array are defined in the emscripten
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// JS. See https://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html#stringToUTF8
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// Add 1 for null terminator
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var strLen = lengthBytesUTF8(key) + 1;
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var strPtr = CanvasKit._malloc(strLen);
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stringToUTF8(key, strPtr, strLen);
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assetNamePtrs.push(strPtr);
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}
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// Not entirely sure if it matters, but the uintptr_t are 32 bits
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// we want to copy our array of uintptr_t into the right size memory.
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var namesPtr = copy1dArray(assetNamePtrs, "HEAPU32");
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var assetsPtr = copy1dArray(assetDataPtrs, "HEAPU32");
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var assetSizesPtr = copy1dArray(assetSizes, "HEAPU32");
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var particles = CanvasKit._MakeParticles(json, assetKeys.length,
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namesPtr, assetsPtr, assetSizesPtr);
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// The C++ code has made copies of the asset and string data, so free our copies.
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CanvasKit._free(namesPtr);
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CanvasKit._free(assetsPtr);
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CanvasKit._free(assetSizesPtr);
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return particles;
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};
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CanvasKit._extraInitializations = CanvasKit._extraInitializations || [];
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CanvasKit._extraInitializations.push(function() {
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CanvasKit.ParticleEffect.prototype.uniforms = function() {
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var fptr = this._uniformPtr();
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var numFloats = this.getUniformFloatCount();
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if (!fptr || numFloats <= 0) {
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return new Float32Array();
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}
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return new Float32Array(CanvasKit.HEAPU8.buffer, fptr, numFloats);
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};
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CanvasKit.ParticleEffect.prototype.setPosition = function(pos) {
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this._setPosition(pos[0], pos[1]);
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};
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});
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