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hyperframes/docs/catalog/blocks/flash-through-white.mdx
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Miguel Ángel d7688f9943 fix(docs): load the player from latest, not a pinned minor (#3320) 
* fix(docs): load the player from latest, not a pinned minor

The catalog pages pinned the player CDN URL to a minor line, and that pin
sat one line behind after the last release. Every page kept rendering, on
the older build, so nothing surfaced it: the only symptom was that a fix
published to npm never appeared on the docs.

The generator derived its pin from the player's package.json, which is
correct only if every page is regenerated on the release that moves it.
That is the step that did not happen, and it has to happen across 175
generated pages plus three hand-written files for the pin to be true.

A version carried in step across 178 places will be stale, and stale here
is silent. Ask for latest instead and there is nothing to carry.

This costs the ability to hold the docs back from a bad player release.
Paid deliberately: the pin did not buy that either, it only delayed the
good releases too.

A test asserts no pinned version comes back, and fails if it stops finding
the references at all, so it cannot pass by matching nothing.

* refactor(scripts): list tracked files instead of walking the tree

The pin guard hand-rolled a recursive directory walk with its own skip
list and size cap, which the audit flagged: helpers living in a test file
earn no coverage, so their complexity lands straight on the CRAP score.

git already knows which files to read, and ignores node_modules and build
output for us, so one call replaces the walker and both findings go away.
2026-08-17 21:11:12 -04:00

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---
title: "Flash Through White"
description: "Shader transition with white flash crossfade"
---
import { InstallCommand } from "/snippets/install-command.jsx";
<iframe
className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800"
title="flash-through-white preview"
loading="lazy"
srcDoc={`<!doctype html><html><head><meta charset="utf-8"><style>html,body{margin:0;height:100%;overflow:hidden;background:transparent}hyperframes-player{display:block;width:100%;height:100%}</style><script src="https://cdn.jsdelivr.net/npm/@hyperframes/player@latest/dist/hyperframes-player.global.js"><\/script></head><body><script>fetch("/public/catalog/blocks/flash-through-white.json").then(function(r){return r.json()}).then(function(d){var p=document.createElement("hyperframes-player");p.setAttribute("srcdoc",d.html);p.setAttribute("controls","");p.setAttribute("autoplay","");p.setAttribute("loop","");p.setAttribute("muted","");p.setAttribute("poster","https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/flash-through-white.png");document.body.appendChild(p)});<\/script></body></html>`}
/>
## Install
<InstallCommand command="npx hyperframes add flash-through-white" item="flash-through-white" />
That writes one file: `compositions/flash-through-white.html`.
## Source
<Accordion title={`flash-through-white.html`}>
```html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
@import url("https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Bebas+Neue&family=JetBrains+Mono:wght@400;700&family=Lato:wght@400;700&display=block");
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
width: 1920px;
height: 1080px;
overflow: hidden;
}
</style>
</head>
<body>
<div
id="root"
data-composition-id="main"
data-start="0"
data-duration="4"
data-width="1920"
data-height="1080"
>
<style>
[data-composition-id="main"] {
width: 1920px;
height: 1080px;
overflow: hidden;
position: relative;
background: #03071e;
}
/* Blueprint grid */
.bp-grid {
position: absolute;
inset: 0;
background-image:
linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
background-size: 40px 40px;
pointer-events: none;
}
/* Layout */
.bp-left {
position: absolute;
left: 0;
top: 0;
bottom: 0;
width: 1200px;
display: flex;
align-items: center;
justify-content: center;
}
.bp-right {
position: absolute;
right: 0;
top: 0;
bottom: 0;
width: 720px;
display: flex;
flex-direction: column;
justify-content: center;
padding: 60px 60px 60px 40px;
}
.bp-divider {
position: absolute;
left: 1200px;
top: 60px;
bottom: 60px;
width: 1px;
background: #ffba08;
opacity: 0.15;
}
.bp-number {
font-family: "Space Mono", monospace;
font-size: 14px;
font-weight: 700;
letter-spacing: 0.4em;
text-transform: uppercase;
position: absolute;
top: 40px;
left: 60px;
color: #ffba08;
}
/* Right panel typography */
.bp-name {
font-family: "Bebas Neue", sans-serif;
font-size: 38px;
letter-spacing: 0.08em;
margin-bottom: 20px;
color: #ffba08;
}
.bp-plabel {
font-family: "Space Mono", monospace;
font-size: 11px;
font-weight: 700;
letter-spacing: 0.3em;
text-transform: uppercase;
margin-bottom: 10px;
color: #ffba08;
opacity: 0.5;
}
.bp-prompt {
font-family: "JetBrains Mono", monospace;
font-size: 20px;
line-height: 1.6;
padding: 16px 20px;
border-radius: 6px;
margin-bottom: 20px;
color: #ffba08;
background: rgba(255, 186, 8, 0.06);
border: 1px solid rgba(255, 186, 8, 0.12);
}
.bp-desc {
font-family: "Lato", sans-serif;
font-size: 17px;
line-height: 1.6;
color: #888;
opacity: 0.55;
}
/* GL scenes (hidden, just for texture capture) */
.scene {
position: absolute;
top: 0;
left: 0;
width: 1200px;
height: 1080px;
overflow: hidden;
display: flex;
align-items: center;
justify-content: center;
}
.scene-label {
font-family: "Bebas Neue", sans-serif;
font-size: 140px;
letter-spacing: 0.06em;
opacity: 0.12;
}
</style>
<div class="bp-grid"></div>
<div class="bp-divider"></div>
<div class="bp-number">12 / 14</div>
<!-- GL demo scenes (captured as textures, then hidden) -->
<div id="s1" class="scene" style="background: #03071e">
<div class="scene-label" style="color: #ffba08">SCENE A</div>
</div>
<div id="s2" class="scene" style="background: #ffba08; opacity: 0">
<div class="scene-label" style="color: #03071e">SCENE B</div>
</div>
<!-- GL canvas (left panel only) -->
<canvas
id="gl-canvas"
width="1200"
height="1080"
style="
position: absolute;
top: 0;
left: 0;
width: 1200px;
height: 1080px;
z-index: 10;
pointer-events: none;
display: none;
"
>
</canvas>
<!-- Right panel metadata -->
<div class="bp-right">
<div class="bp-name">Flash Through White</div>
<div class="bp-plabel">Prompt</div>
<div class="bp-prompt">"use flash through white shader transition"</div>
<div class="bp-desc">
Both scenes brighten to a white midpoint. Works on dark backgrounds where
color-dip-to-black is invisible.
</div>
</div>
<div
id="driver"
class="clip"
data-start="0"
data-duration="4"
data-track-index="0"
style="position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none"
></div>
</div>
<script>
window.__timelines = window.__timelines || {};
var glCanvas = document.getElementById("gl-canvas");
var gl = glCanvas.getContext("webgl", { preserveDrawingBuffer: true });
if (!gl) {
console.warn("WebGL not available");
window.__timelines["main"] = gsap.timeline({ paused: true });
} else {
gl.viewport(0, 0, 1200, 1080);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
var sceneTextures = {};
function captureScene(sceneId) {
var scene = document.getElementById(sceneId);
var origOpacity = scene.style.opacity;
var origZ = scene.style.zIndex;
scene.style.opacity = "1";
scene.style.zIndex = "999";
scene.offsetHeight;
var c = document.createElement("canvas");
c.width = 1200;
c.height = 1080;
var ctx = c.getContext("2d");
ctx.fillStyle = window.getComputedStyle(scene).backgroundColor;
ctx.fillRect(0, 0, 1200, 1080);
var sr = scene.getBoundingClientRect();
var els = scene.querySelectorAll("*");
for (var i = 0; i < els.length; i++) {
var el = els[i],
cs = window.getComputedStyle(el);
if (cs.display === "none" || cs.visibility === "hidden") continue;
var r = el.getBoundingClientRect();
if (r.width < 1 || r.height < 1) continue;
var x = r.left - sr.left,
y = r.top - sr.top,
w = r.width,
h = r.height;
ctx.save();
ctx.globalAlpha = parseFloat(cs.opacity) || 1;
var bg = cs.backgroundColor;
if (bg && bg !== "rgba(0, 0, 0, 0)" && bg !== "transparent") {
ctx.fillStyle = bg;
ctx.fillRect(x, y, w, h);
}
var hasChildEls = el.querySelector("div,span,img,video");
var text = "";
for (var j = 0; j < el.childNodes.length; j++)
if (el.childNodes[j].nodeType === 3) text += el.childNodes[j].textContent;
text = text.trim();
if (text && !hasChildEls) {
ctx.font = cs.fontWeight + " " + cs.fontSize + " " + cs.fontFamily;
ctx.fillStyle = cs.color;
if (cs.letterSpacing && cs.letterSpacing !== "normal")
ctx.letterSpacing = cs.letterSpacing;
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.fillText(text, x + w / 2, y + h / 2);
}
ctx.restore();
}
scene.style.opacity = origOpacity;
scene.style.zIndex = origZ;
var tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, c);
sceneTextures[sceneId] = tex;
}
var vertSrc =
"attribute vec2 a_pos; varying vec2 v_uv; void main(){" +
"v_uv=a_pos*0.5+0.5; v_uv.y=1.0-v_uv.y; gl_Position=vec4(a_pos,0,1);}";
var quadBuf = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, quadBuf);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1]),
gl.STATIC_DRAW,
);
function compileShader(src, type) {
var s = gl.createShader(type);
gl.shaderSource(s, src);
gl.compileShader(s);
if (!gl.getShaderParameter(s, gl.COMPILE_STATUS))
console.error("Shader:", gl.getShaderInfoLog(s));
return s;
}
function mkProg(fragSrc) {
var p = gl.createProgram();
gl.attachShader(p, compileShader(vertSrc, gl.VERTEX_SHADER));
gl.attachShader(p, compileShader(fragSrc, gl.FRAGMENT_SHADER));
gl.linkProgram(p);
if (!gl.getProgramParameter(p, gl.LINK_STATUS))
console.error("Link:", gl.getProgramInfoLog(p));
return p;
}
var H =
"precision mediump float;" +
"varying vec2 v_uv;" +
"uniform sampler2D u_from, u_to;" +
"uniform float u_progress;" +
"uniform vec2 u_resolution;\n";
var progPass = mkProg(H + "void main(){gl_FragColor=texture2D(u_from,v_uv);}");
var progTrans = mkProg(
H +
"void main(){vec4 A=texture2D(u_from,v_uv),B=texture2D(u_to,v_uv);float toWhite=smoothstep(0.,.45,u_progress);vec3 fromC=mix(A.rgb,vec3(1.),toWhite);float fromWhite=1.-smoothstep(.5,1.,u_progress);vec3 toC=mix(B.rgb,vec3(1.),fromWhite);gl_FragColor=vec4(mix(fromC,toC,smoothstep(.35,.65,u_progress)),1.);}",
);
function renderShader(prog, texFrom, texTo, progress) {
gl.useProgram(prog);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texFrom);
gl.uniform1i(gl.getUniformLocation(prog, "u_from"), 0);
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, texTo);
gl.uniform1i(gl.getUniformLocation(prog, "u_to"), 1);
gl.uniform1f(gl.getUniformLocation(prog, "u_progress"), progress);
gl.uniform2f(gl.getUniformLocation(prog, "u_resolution"), 1200, 1080);
var pos = gl.getAttribLocation(prog, "a_pos");
gl.bindBuffer(gl.ARRAY_BUFFER, quadBuf);
gl.enableVertexAttribArray(pos);
gl.vertexAttribPointer(pos, 2, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
}
function easeInOut(p) {
return p < 0.5 ? 2 * p * p : 1 - Math.pow(-2 * p + 2, 2) / 2;
}
captureScene("s1");
captureScene("s2");
glCanvas.style.display = "block";
renderShader(progPass, sceneTextures["s1"], sceneTextures["s1"], 0);
document.querySelectorAll(".scene").forEach(function (s) {
s.style.opacity = "0";
});
var tl = gsap.timeline({
paused: true,
onUpdate: function () {
var t = tl.time();
if (t >= 1.0 && t < 3.0) {
renderShader(
progTrans,
sceneTextures["s1"],
sceneTextures["s2"],
easeInOut((t - 1.0) / 2.0),
);
} else if (t >= 3.0) {
renderShader(progPass, sceneTextures["s2"], sceneTextures["s2"], 0);
} else {
renderShader(progPass, sceneTextures["s1"], sceneTextures["s1"], 0);
}
},
});
tl.to({ v: 0 }, { v: 1, duration: 4, ease: "none" }, 0);
window.__timelines["main"] = tl;
} // end if (gl)
</script>
</body>
</html>
```
</Accordion>
## Usage
After installing, add the block to your host composition:
```html
<div data-composition-id="flash-through-white" data-composition-src="compositions/flash-through-white.html" data-start="0" data-duration="4" data-track-index="1" data-width="1920" data-height="1080"></div>
```
{/* hf:generated-footer */}
Tagged `transition` `shader`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
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