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Optimize background animation drastically by using offscreen canvases to reuse frames. Rewrite animate function to prevent it from being called multiple times

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This commit is contained in:
schlagmichdoch 2023-03-25 01:54:24 +01:00
parent ce549adf22
commit dcc4e8b747
2 changed files with 104 additions and 71 deletions
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88
public/scripts/ui.js
View file

@ -1943,68 +1943,84 @@ Events.on('load', () => {
style.zIndex = -1;
style.top = 0;
style.left = 0;
let ctx = c.getContext('2d');
let cCtx = c.getContext('2d');
let x0, y0, w, h, dw, offset;
let offscreenCanvases = [];
function init() {
let oldW = w;
let oldH = h;
let oldOffset = offset
w = document.documentElement.clientWidth;
h = document.documentElement.clientHeight;
c.width = w;
c.height = h;
offset = $$('footer').offsetHeight - 32;
if (h > 800) offset += 16;
if (oldW === w && oldH === h && oldOffset === offset) return; // nothing has changed
c.width = w;
c.height = h;
x0 = w / 2;
y0 = h - offset;
dw = Math.max(w, h, 1000) / 13;
drawCircles();
dw = Math.round(Math.max(w, h, 1000) / 13);
drawCircles(cCtx, 0);
// enforce redrawing of frames
offscreenCanvases = [];
}
Events.on('bg-resize', _ => init());
window.onresize = _ => Events.fire('bg-resize');
function drawCircle(radius) {
function drawCircle(ctx, radius) {
ctx.beginPath();
let color = Math.round(255 * (1 - radius / Math.max(w, h)));
ctx.strokeStyle = 'rgba(' + color + ',' + color + ',' + color + ',0.1)';
ctx.lineWidth = 2;
let opacity = 0.2 * (1 - 1.2 * radius / Math.max(w, h));
ctx.strokeStyle = `rgb(128, 128, 128, ${opacity})`;
ctx.arc(x0, y0, radius, 0, 2 * Math.PI);
ctx.stroke();
ctx.lineWidth = 2;
}
let step = 0;
function drawCircles() {
ctx.clearRect(0, 0, w, h);
for (let i = 0; i < 8; i++) {
drawCircle(dw * i + step % dw);
}
step += 1;
}
let loading = true;
function animate() {
if (loading || !finished()) {
requestAnimationFrame(function() {
drawCircles();
animate();
});
function drawCircles(ctx, frame) {
for (let i = 0; i < 13; i++) {
drawCircle(ctx, dw * i + frame);
}
}
function finished() {
return step % dw >= dw - 5;
function createOffscreenCanvas(frame) {
let canvas = document.createElement("canvas");
canvas.width = c.width;
canvas.height = c.height;
offscreenCanvases[frame] = canvas;
let ctx = canvas.getContext('2d');
drawCircles(ctx, frame);
}
function drawFrame(frame) {
cCtx.clearRect(0, 0, w, h);
if (!offscreenCanvases[frame]) {
createOffscreenCanvas(frame);
}
cCtx.drawImage(offscreenCanvases[frame], 0, 0);
}
let animate = true;
let currentFrame = 0;
function animateBg() {
if (currentFrame + 1 < dw || animate) {
currentFrame = (currentFrame + 1) % dw;
drawFrame(currentFrame);
}
setTimeout(_ => animateBg(), 3000 / dw);
}
window.animateBackground = function(l) {
if (!l) {
loading = false;
} else if (!loading) {
loading = true;
if (finished()) animate();
}
animate = l;
};
init();
animate();
animateBg();
});
document.changeFavicon = function (src) {

87
public_included_ws_fallback/scripts/ui.js
View file

@ -1944,67 +1944,84 @@ Events.on('load', () => {
style.zIndex = -1;
style.top = 0;
style.left = 0;
let ctx = c.getContext('2d');
let cCtx = c.getContext('2d');
let x0, y0, w, h, dw, offset;
let offscreenCanvases = [];
function init() {
let oldW = w;
let oldH = h;
let oldOffset = offset
w = document.documentElement.clientWidth;
h = document.documentElement.clientHeight;
offset = $$('footer').offsetHeight - 32;
if (h > 800) offset += 16;
if (oldW === w && oldH === h && oldOffset === offset) return; // nothing has changed
c.width = w;
c.height = h;
offset = $$('footer').offsetHeight - 32;
x0 = w / 2;
y0 = h - offset;
dw = Math.max(w, h, 1000) / 13;
drawCircles();
dw = Math.round(Math.max(w, h, 1000) / 13);
drawCircles(cCtx, 0);
// enforce redrawing of frames
offscreenCanvases = [];
}
Events.on('bg-resize', _ => init());
window.onresize = _ => Events.fire('bg-resize');
function drawCircle(radius) {
function drawCircle(ctx, radius) {
ctx.beginPath();
let color = Math.round(255 * (1 - radius / Math.max(w, h)));
ctx.strokeStyle = 'rgba(' + color + ',' + color + ',' + color + ',0.1)';
ctx.lineWidth = 2;
let opacity = 0.2 * (1 - 1.2 * radius / Math.max(w, h));
ctx.strokeStyle = `rgb(128, 128, 128, ${opacity})`;
ctx.arc(x0, y0, radius, 0, 2 * Math.PI);
ctx.stroke();
ctx.lineWidth = 2;
}
let step = 0;
function drawCircles() {
ctx.clearRect(0, 0, w, h);
for (let i = 0; i < 8; i++) {
drawCircle(dw * i + step % dw);
}
step += 1;
}
let loading = true;
function animate() {
if (loading || !finished()) {
requestAnimationFrame(function() {
drawCircles();
animate();
});
function drawCircles(ctx, frame) {
for (let i = 0; i < 13; i++) {
drawCircle(ctx, dw * i + frame);
}
}
function finished() {
return step % dw >= dw - 5;
function createOffscreenCanvas(frame) {
let canvas = document.createElement("canvas");
canvas.width = c.width;
canvas.height = c.height;
offscreenCanvases[frame] = canvas;
let ctx = canvas.getContext('2d');
drawCircles(ctx, frame);
}
function drawFrame(frame) {
cCtx.clearRect(0, 0, w, h);
if (!offscreenCanvases[frame]) {
createOffscreenCanvas(frame);
}
cCtx.drawImage(offscreenCanvases[frame], 0, 0);
}
let animate = true;
let currentFrame = 0;
function animateBg() {
if (currentFrame + 1 < dw || animate) {
currentFrame = (currentFrame + 1) % dw;
drawFrame(currentFrame);
}
setTimeout(_ => animateBg(), 3000 / dw);
}
window.animateBackground = function(l) {
if (!l) {
loading = false;
} else if (!loading) {
loading = true;
if (finished()) animate();
}
animate = l;
};
init();
animate();
animateBg();
});
document.changeFavicon = function (src) {