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index.html
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index.html
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<html>
<body>
<h1>Wasm demo</h1>
<div id="time"> </div>
<table>
<tr>
<th><button onclick="js.reset()">Reset</button>
<tr>
<th>JavaScript
<td><button onclick="js.invert()">Invert</button>
<td><button onclick="js.grayscale()">Grayscale</button>
<td><button onclick="js.sepia()">Sepia</button>
<td><button onclick="js.convolve(width, offset.blur, ...matrices.blur )">Blur</button>
<td><button onclick="js.convolve(width, offset.edge_detect, ...matrices.edge_detect )">Edge detect</button>
<td><button onclick="js.convolve(width, offset.emboss, ...matrices.emboss )">Emboss</button>
<tr>
<th>AssemblyScript
<td><button onclick="as.invert()">Invert</button>
<td><button onclick="as.grayscale()">Grayscale</button>
<td><button onclick="as.sepia()">Sepia</button>
<td><button onclick="as.convolve(width, offset.blur, ...matrices.blur )">Blur</button>
<td><button onclick="as.convolve(width, offset.edge_detect, ...matrices.edge_detect )">Edge detect</button>
<td><button onclick="as.convolve(width, offset.emboss, ...matrices.emboss )">Emboss</button>
</table>
<canvas width="600px" height="600px"></canvas>
<script>
const canvas = document.querySelector("canvas");
const width = canvas.width;
const height = canvas.height;
async function run() {
const ctx = await drawCanvas();
const imageData = ctx.getImageData(0, 0, width, height);
setupJsTransforms(ctx, imageData)
await setupAsTransforms(ctx, imageData)
}
run()
function setupJsTransforms(ctx, imageData){
const backup = imageData.data.slice();
Object.assign(js,{
reset: js_transform(function reset(data){ data.set(backup)}, imageData, ctx),
invert: js_transform(invert, imageData, ctx),
grayscale: js_transform(grayscale, imageData, ctx),
sepia: js_transform(sepia, imageData, ctx),
convolve: js_transform(convolve, imageData, ctx),
});
}
async function setupAsTransforms(ctx, imageData){
const data = imageData.data;
const byteSize = data.length;
const initial = 2 * (((byteSize + 0xffff) & ~0xffff) >>> 16);
const memory = new WebAssembly.Memory({ initial });
const importObject = { env: { memory, abort: () => console.log("Abort!") }};
let module;
if (typeof WebAssembly.instantiateStreaming !== 'undefined') {
// for Chrome & Firefox
module = await WebAssembly.instantiateStreaming(
fetch("./build/optimized.wasm"),
importObject
);
} else {
// for Safari
module = await WebAssembly.instantiate(
await (await fetch("./build/optimized.wasm")).arrayBuffer(),
importObject
);
}
const { instance } = module;
const mem = new Uint8Array(memory.buffer);
Object.assign(as, {
invert: as_transform("invert", imageData, ctx, mem, instance),
grayscale: as_transform("grayscale", imageData, ctx, mem, instance),
sepia: as_transform("sepia", imageData, ctx, mem, instance),
convolve: as_transform("convolve", imageData, ctx, mem, instance),
});
}
async function drawCanvas(){
const img = await loadImage();
const ctx = canvas.getContext("2d");
drawImage(canvas, ctx, img);
return ctx;
}
function drawImage(canvas, ctx, img) {
var scale = Math.max(width / img.width, height / img.height);
var x = (width / 2) - (img.width / 2) * scale;
var y = (height / 2) - (img.height / 2) * scale;
ctx.drawImage(img, x, y, img.width * scale, img.height * scale);
}
async function loadImage(){
return new Promise(resolve => {
var img = new Image();
img.src = 'photo.jpg';
img.onload = function() { resolve(this) };
});
}
function js_transform(fn, imageData, ctx) {
return (...args) => {
let data = imageData.data;
let time = performance.now();
fn(data, ...args);
logTime(`JS_${fn.name}`, time);
ctx.putImageData(imageData, 0, 0);
}
};
function as_transform(fn, imageData, ctx, mem, instance) {
return (...args) => {
//retrieve image pixels (4 bytes per pixel: RBGA)
const data = imageData.data;
//copy to bytes to shared memory
mem.set(data);
//invoque 'fn' Wasm filter. We need to inform of the image byte size
const byteSize = data.length;
let time = performance.now();
instance.exports[fn](byteSize, ...args);
logTime(`AS_${fn}`, time);
//copy the response from the shared memory into the canvas imageData
data.set(mem.subarray(byteSize, 2 * byteSize));
ctx.putImageData(imageData, 0, 0);
}
};
function logTime(name, start) {
let end = performance.now();
document.getElementById("time").innerText = `${name}: ${(end - start).toFixed(1)} ms `;
}
const js = {};
const as = {};
function invert(data) {
for (let i = 0, len = data.length; i < len; i += 4) {
data[i + 0] = 255 - data[i + 0];
data[i + 1] = 255 - data[i + 1];
data[i + 2] = 255 - data[i + 2];
}
};
function grayscale(data){
for (var i = 0, len = data.length; i < len; i += 4) {
const avg = 0.3 * data[i] + 0.59 * data[i + 1] + 0.11 * data[i + 2];
data[i] = avg;
data[i + 1] = avg;
data[i + 2] = avg;
}
}
function sepia(data){
for (var i = 0, len = data.length; i < len; i += 4) {
const avg = 0.3 * data[i] + 0.59 * data[i + 1] + 0.11 * data[i + 2];
data[i] = avg + 100;
data[i + 1] = avg + 50;
data[i + 2] = avg;
}
}
function addConvolveValue(pos, i, data, length){
return pos >= 0 && pos < length ? data[pos] : data[i];
}
function convolve(data, w, offset, v00, v01, v02, v10, v11, v12, v20, v21, v22){
console.log( w, offset, v00, v01, v02, v10, v11, v12, v20, v21, v22)
const divisor = (v00 + v01 + v02 + v10 + v11 + v12 + v20 + v21 + v22) || 1;
const length = data.length;
let res = 0;
let newData = new Uint8Array(length);
for (let i = 0; i < length; i++) {
if (((i + 1) & 3) == 0) {
newData[i] = data[i];
continue;
}
let res = v00 * addConvolveValue(i - w * 4 - 4, i, data, length) +
v01 * addConvolveValue(i - w * 4, i, data, length) +
v02 * addConvolveValue(i - w * 4 + 4, i, data, length) +
v10 * addConvolveValue(i - 4, i, data, length) +
v11 * data[i] +
v12 * addConvolveValue(i + 4, i, data, length) +
v20 * addConvolveValue(i + w * 4 - 4, i, data, length) +
v21 * addConvolveValue(i + w * 4 , i, data, length) +
v22 * addConvolveValue(i + w * 4 + 4, i, data, length);
res /= divisor;
res += offset;
newData[i] = res;
}
data.set(newData)
}
const offset = {
'sharpen1':0,
'sharpen2':0,
'blur':0,
'emboss':127,
'emboss_subtle':0,
'edge_detect':0,
'edge_detect_2':0,
}
const matrices = {
'sharpen1': [-1, -1, -1, -1, 9, -1, -1, -1, -1],
'sharpen2': [ 0, -2, 0, -2, 11, -2, 0, -2, 0],
'blur': [ 1, 2, 1, 2, 4, 2, 1, 2, 1],
'emboss': [ 2, 0, 0, 0, -1, 0, 0, 0, -1],
'emboss_subtle': [ 1, 1, -1, 1, 3, -1, 1, -1, -1],
'edge_detect': [ 1, 1, 1, 1, -7, 1, 1, 1, 1],
'edge_detect_2': [-5, 0, 0, 0, 0, 0, 0, 0, 5],
}
</script>
</body>
</html>