mirror of
https://github.com/GoogleChromeLabs/squoosh.git
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49 lines
1.9 KiB
HTML
49 lines
1.9 KiB
HTML
<!doctype html>
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<script src='webp_enc.js'></script>
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<script>
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const Module = webp_enc();
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async function loadImage(src) {
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// Load image
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const img = document.createElement('img');
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img.src = src;
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await new Promise(resolve => img.onload = resolve);
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// Make canvas same size as image
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const canvas = document.createElement('canvas');
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[canvas.width, canvas.height] = [img.width, img.height];
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// Draw image onto canvas
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const ctx = canvas.getContext('2d');
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ctx.drawImage(img, 0, 0);
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return ctx.getImageData(0, 0, img.width, img.height);
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}
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Module.onRuntimeInitialized = async _ => {
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const api = {
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version: Module.cwrap('version', 'number', []),
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create_buffer: Module.cwrap('create_buffer', 'number', ['number', 'number']),
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destroy_buffer: Module.cwrap('destroy_buffer', '', ['number']),
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encode: Module.cwrap('encode', '', ['number', 'number', 'number', 'number']),
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free_result: Module.cwrap('free_result', '', ['number']),
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get_result_pointer: Module.cwrap('get_result_pointer', 'number', []),
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get_result_size: Module.cwrap('get_result_size', 'number', []),
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};
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console.log('Version:', api.version().toString(16));
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const image = await loadImage('../example.png');
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const p = api.create_buffer(image.width, image.height);
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Module.HEAP8.set(image.data, p);
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api.encode(p, image.width, image.height, 2);
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const resultPointer = api.get_result_pointer();
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const resultSize = api.get_result_size();
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const resultView = new Uint8Array(Module.HEAP8.buffer, resultPointer, resultSize);
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const result = new Uint8Array(resultView);
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api.free_result(resultPointer);
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api.destroy_buffer(p);
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const blob = new Blob([result], {type: 'image/webp'});
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const blobURL = URL.createObjectURL(blob);
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const img = document.createElement('img');
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img.src = blobURL;
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document.body.appendChild(img);
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};
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</script>
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