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screen-hdr.html
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<html>
<head>
<script>
var current_screen_details;
var rendering_hdr_headroom = 1;
function onRenderingHdrHeadroomSliderChanged() {
rendering_hdr_headroom = Math.pow(2.0, RenderingHdrHeadroomSlider.value);
RenderingHdrHeadroomSliderLabel.innerText = 'Rendering HDR headroom: ' + rendering_hdr_headroom.toFixed(2);
}
function onCurrentScreenDetailsChanged() {
let screen_hdr_headroom = current_screen_details.highDynamicRangeHeadroom;
if (SetRenderingFromScreen.checked && screen_hdr_headroom) {
RenderingHdrHeadroomSlider.value = Math.log(screen_hdr_headroom) / Math.log(2.0);
onRenderingHdrHeadroomSliderChanged();
}
document.getElementById('DisplayValue').innerText =
'Screen HDR headroom: ' + screen_hdr_headroom.toFixed(2) + '.';
}
function main() {
// Configure screen information listener.
ButtonDetails.addEventListener('click', async function screenDetails() {
const screens = await window.getScreenDetails();
current_screen_details = screens.currentScreen;
onCurrentScreenDetailsChanged();
screens.addEventListener('currentscreenchange', (event) => {
current_screen_details = screens.currentScreen;
onCurrentScreenDetailsChanged();
});
})
// Configure rendering slider.
RenderingHdrHeadroomSlider.addEventListener('input', onRenderingHdrHeadroomSliderChanged, false);
}
</script>
</head>
<body onload='main()'>
<h1>Screen details</h1>
<p id="DisplayValue">Screen HDR headroom: (unknown)</p>
<p><button type="button" id="ButtonDetails">Query screen HDR headroom</button></p>
<h1>Rendering settings</h1>
<p>
<label id="RenderingHdrHeadroomSliderLabel" for="RenderingHdrHeadroomSlider">Rendering HDR headroom: 1.00</label>.
<label id="SetRenderingFromScreenlabel" for="SetRenderingFromScreen">Set from screen:</label>
<input type="checkbox" id="SetRenderingFromScreen" name="SetRenderingFromScreen" checked onclick="onCurrentScreenDetailsChanged();">
</p>
<p><input id="RenderingHdrHeadroomSlider" type="range" min="0" max="5" step="0.1" value="0" list="tickmarks""/></p>
<datalist id="tickmarks">
<option value="0"></option>
<option value="1"></option>
<option value="2"></option>
<option value="3"></option>
<option value="4"></option>
</datalist>
</body>
</html>