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Merge pull request #19635 from Snuffleupagus/thumbnails-maxCanvasPixels

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Support the `maxCanvasPixels` option in the thumbnails code
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Jonas Jenwald 2025-03-10 16:30:25 +01:00 • committed by GitHub
commit 4152eae3fb
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5 changed files with 79 additions and 50 deletions
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30
src/display/display_utils.js
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@ -640,9 +640,39 @@ class OutputScale {
return this.sx !== 1 || this.sy !== 1;
}
/**
* @type {boolean} Returns `true` when scaling is symmetric,
* `false` otherwise.
*/
get symmetric() {
return this.sx === this.sy;
}
/**
* @returns {boolean} Returns `true` if scaling was limited,
* `false` otherwise.
*/
limitCanvas(width, height, maxPixels, maxDim) {
let maxAreaScale = Infinity,
maxWidthScale = Infinity,
maxHeightScale = Infinity;
if (maxPixels > 0) {
maxAreaScale = Math.sqrt(maxPixels / (width * height));
}
if (maxDim !== -1) {
maxWidthScale = maxDim / width;
maxHeightScale = maxDim / height;
}
const maxScale = Math.min(maxAreaScale, maxWidthScale, maxHeightScale);
if (this.sx > maxScale || this.sy > maxScale) {
this.sx = maxScale;
this.sy = maxScale;
return true;
}
return false;
}
}
// See https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Image_types