hastily
Version:
express middleware to simulate fastly cdn
87 lines • 6.3 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.optoResizeFilterToSharp = exports.optoFitToSharp = void 0;
exports.optoFitToSharp = {
bounds: 'inside',
cover: 'outside',
crop: 'cover',
};
// sharp supports mitchell interpolation and not bilinear,
// but who's gonna notice?
exports.optoResizeFilterToSharp = {
bicubic: 'cubic',
bilinear: 'mitchell',
cubic: 'cubic',
lanczos: 'lanczos3',
lanczos2: 'lanczos2',
lanczos3: 'lanczos3',
linear: 'mitchell',
nearest: 'nearest',
};
/**
* @hidden
*/
const resize = (sharp, params) => {
if (!params.has('width')) {
params.warn('unsupported', 'width', 'resize without width param. Will not resize.');
return false;
}
const nums = params.toNumbers(['width', 'height', 'dpr']);
const width = nums[0];
let height = nums[1];
const dpr = nums[2];
for (const [name, param] of [
['width', width],
['height', height],
]) {
if (param < 1 && param > 0) {
params.warn('unsupported', name, 'ratio-based resize/crop. Will not apply.');
return false;
}
}
if (isNaN(width)) {
params.warn('invalid', 'width', 'resize with non-numeric width param');
return false;
}
if (isNaN(height)) {
height = undefined;
}
const { log } = params;
log.debug('width %s, height %s, dpr %s', width, height, dpr);
const options = {
withoutEnlargement: true,
};
if (params.has('fit')) {
const fitOpt = params.get('fit');
const fit = exports.optoFitToSharp[fitOpt];
if (fit) {
options.fit = fit;
}
else {
params.warn('unsupported', 'fit');
}
log.debug('mapped options.fit from %s -> %s', fitOpt, options.fit);
}
else if (typeof height === 'number' && height > 0) {
options.fit = 'fill';
}
if (params.get('enable') === 'true' || params.get('disable') === 'false') {
log.debug('overriding withoutEnlargement to false, yucky enlargement enabled');
options.withoutEnlargement = false;
}
if (params.has('resize-filter')) {
const filterOpt = params.get('resize-filter');
const kernel = exports.optoResizeFilterToSharp[filterOpt];
if (kernel) {
options.kernel = kernel;
}
else {
params.warn('unsupported', 'fit');
}
log.debug('mapped options.resize-filter from %s -> %s', filterOpt, options.kernel);
}
log.debug('sharp.resize(%s, %s, %o)', width, height, options);
return sharp.resize(width, height, options);
};
exports.default = resize;
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