forked from external-repos/squoosh
45221c0b03
* Implement alpha premultiplication * Add benchmark to resize * Only display "Premultiply alpha" if it's one of the rust resize types. * Add comment about division by zero
42 lines
1.4 KiB
JavaScript
42 lines
1.4 KiB
JavaScript
// THIS IS NOT A NODE SCRIPT
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// This is a d8 script. Please install jsvu[1] and install v8.
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// Then run `npm run --silent benchmark`.
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// [1]: https://github.com/GoogleChromeLabs/jsvu
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self = global = this;
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load('./pkg/resize.js');
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async function init() {
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// Adjustable constants.
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const inputDimensions = 2000;
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const outputDimensions = 1500;
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const algorithm = 3; // Lanczos
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const iterations = new Array(100);
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// Constants. Don’t change.
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const imageByteSize = inputDimensions * inputDimensions * 4;
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const imageBuffer = new Uint8ClampedArray(imageByteSize);
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const module = await WebAssembly.compile(readbuffer("./pkg/resize_bg.wasm"));
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await wasm_bindgen(module);
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[false, true].forEach(premulti => {
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print(`\npremultiplication: ${premulti}`);
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print(`==============================`);
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for (let i = 0; i < 100; i++) {
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const start = Date.now();
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wasm_bindgen.resize(imageBuffer, inputDimensions, inputDimensions, outputDimensions, outputDimensions, algorithm, premulti);
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iterations[i] = Date.now() - start;
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}
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const average = iterations.reduce((sum, c) => sum + c) / iterations.length;
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const stddev = Math.sqrt(
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iterations
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.map(i => Math.pow(i - average, 2))
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.reduce((sum, c) => sum + c) / iterations.length
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);
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print(`n = ${iterations.length}`);
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print(`Average: ${average}`);
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print(`StdDev: ${stddev}`);
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});
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}
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init().catch(e => console.error(e, e.stack));
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