mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Popups
synced 2024-11-23 15:16:50 +00:00
38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
/**
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* Popups thumbnails are requested from the server at a size
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* relative to the screen DPI. Since we're not making that
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* server request, instead using predefined models, we have to
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* scale the thumbnail dimensions down manually for low-dpi displays.
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*
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* We're only scaling images down and not up since the correct
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* behaviour for popup is to not display an image if it's too small.
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* An image that's too big wouldn't be requested in the first place.
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*
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* It's best to define hi-dpi images in the models, unless the purpose
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* is to display the thumbnail on a low-dpi display and not a hi-dpi one.
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*/
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import { default as CONSTANTS } from '../../src/constants';
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/**
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* Scaled down thumbnails for low-dpi displays.
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* @param {Object} thumbnail - PagePreviewModel.thumbnail property
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* @return {Object} PagePreviewModel.thumbnail property
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*/
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export default function scaleDownThumbnail( thumbnail ) {
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const
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x = thumbnail.width,
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y = thumbnail.height,
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ratio = Math.min(CONSTANTS.THUMBNAIL_SIZE / x, CONSTANTS.THUMBNAIL_SIZE / y),
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thumbSrc = thumbnail.source,
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maxPxSize = CONSTANTS.THUMBNAIL_SIZE + 'px',
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scaledSrc = thumbSrc.replace( /\d*.px/, maxPxSize );
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return Object.assign({}, thumbnail, {
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source: scaledSrc,
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width: x * ratio,
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height: y * ratio,
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});
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}
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