forked from external-repos/squoosh
46 lines
1.8 KiB
HTML
46 lines
1.8 KiB
HTML
<!doctype html>
|
|
<script src='webp_dec.js'></script>
|
|
<script>
|
|
const Module = webp_dec();
|
|
|
|
async function loadFile(src) {
|
|
const resp = await fetch(src);
|
|
return await resp.arrayBuffer();
|
|
}
|
|
|
|
Module.onRuntimeInitialized = async _ => {
|
|
const api = {
|
|
version: Module.cwrap('version', 'number', []),
|
|
create_buffer: Module.cwrap('create_buffer', 'number', ['number', 'number']),
|
|
destroy_buffer: Module.cwrap('destroy_buffer', '', ['number']),
|
|
decode: Module.cwrap('decode', '', ['number', 'number']),
|
|
free_result: Module.cwrap('free_result', '', ['number']),
|
|
get_result_pointer: Module.cwrap('get_result_pointer', 'number', []),
|
|
get_result_width: Module.cwrap('get_result_width', 'number', []),
|
|
get_result_height: Module.cwrap('get_result_height', 'number', []),
|
|
};
|
|
console.log('Version:', api.version().toString(16));
|
|
const image = await loadFile('../example.webp');
|
|
const p = api.create_buffer(image.byteLength);
|
|
Module.HEAP8.set(new Uint8Array(image), p);
|
|
api.decode(p, image.byteLength);
|
|
const resultPointer = api.get_result_pointer();
|
|
if(resultPointer === 0) {
|
|
throw new Error("Could not decode image");
|
|
}
|
|
const resultWidth = api.get_result_width();
|
|
const resultHeight = api.get_result_height();
|
|
const resultView = new Uint8Array(Module.HEAP8.buffer, resultPointer, resultWidth * resultHeight * 4);
|
|
const result = new Uint8ClampedArray(resultView);
|
|
const imageData = new ImageData(result, resultWidth, resultHeight);
|
|
api.free_result(resultPointer);
|
|
api.destroy_buffer(p);
|
|
const canvas = document.createElement('canvas');
|
|
canvas.width = resultWidth;
|
|
canvas.height = resultHeight;
|
|
document.body.appendChild(canvas);
|
|
const ctx = canvas.getContext('2d');
|
|
ctx.putImageData(imageData, 0, 0);
|
|
};
|
|
</script>
|