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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | 3x 3x 3x 3x 3x 201x 201x 166x 201x 201x 8x 193x 39x 11x 5x 1x 4x 39x 39x 43x 42x 19x 3x 16x 3x 13x 74x 37x 37x 37x 47x 43x 22x 11x 11x 38x 35x 34x 23x 11x 2x 11x 11x 11x 11x 36x 35x 4x 2x 2x 2x 35x 40x 39x 38x 38x 2x 2x 4x 4x 1x 1x 4x 32x 38x 38x 4x 38x 31x 31x 3x 3x 3x 3x 3x 2x 2x 1x 1x 3x 3x 12x 6x 6x 3x 16x 52x 16x 16x 5x 11x 11x 11x 2x 9x 9x 20x 20x 20x 2x 20x 40x 20x 20x 3x 17x 3x | const Sharp = require('sharp');
const IIIFError = require('./error');
// Integer RegEx
const IR = '\\d+';
// Float RegEx
const FR = '\\d+(?:\.\\d+)?'; // eslint-disable-line no-useless-escape
const Validators = {
quality: ['color', 'gray', 'bitonal', 'default'],
format: ['jpg', 'jpeg', 'tif', 'tiff', 'png', 'webp'],
region: ['full', 'square', `pct:${FR},${FR},${FR},${FR}`, `${IR},${IR},${IR},${IR}`],
size: ['full', 'max', `pct:${FR}`, `${IR},`, `,${IR}`, `\\!?${IR},${IR}`],
rotation: `\\!?${FR}`
};
function validator (type) {
let result = Validators[type];
if (result instanceof Array) {
result = result.join('|');
}
return new RegExp('^(' + result + ')$');
}
function validate (type, v) {
if (!validator(type).test(v)) {
throw new IIIFError(`Invalid ${type}: ${v}`);
}
return true;
}
function validateDensity (v) {
if (v === null) return true;
if (v === undefined) return true;
if (typeof v !== 'number' || v < 0) {
throw new IIIFError(`Invalid density value: ${v}`);
}
return true;
};
class Operations {
constructor (dims) {
this.dims = dims;
this.pipeline = Sharp({ limitInputPixels: false });
}
region (v) {
validate('region', v);
if (v === 'full') {
// do nothing
} else if (v === 'square') {
this._regionSquare(this.dims);
} else if (v.match(/^pct:([\d.,]+)/)) {
this._regionPct(RegExp.$1, this.dims);
} else {
this._regionXYWH(v);
}
const ifPositive = (a, b) => (a > 0 ? a : b);
this.dims.width = ifPositive(this.pipeline.options.widthPre, this.dims.width);
this.dims.height = ifPositive(this.pipeline.options.heightPre, this.dims.height);
return this;
}
size (v) {
validate('size', v);
if (v === 'full' || v === 'max') {
// do nothing
} else if (v.match(/^pct:([\d]+)/)) {
this._sizePct(RegExp.$1, this.dims);
} else {
this._sizeWH(v);
}
return this;
}
rotation (v) {
validate('rotation', v);
if (v === '0') {
return this;
}
if (v[0] === '!') {
this.pipeline = this.pipeline.flop();
}
const value = Number(v.replace(/^!/, ''));
Iif (isNaN(value)) {
throw new IIIFError(`Invalid rotation value: ${v}`);
}
this.pipeline = this.pipeline.rotate(value);
return this;
}
quality (v) {
validate('quality', v);
if (v === 'color' || v === 'default') {
// do nothing
} else if (v === 'gray') {
this.pipeline = this.pipeline.grayscale();
} else if (v === 'bitonal') {
this.pipeline = this.pipeline.threshold();
}
return this;
}
format (v, density) {
validate('format', v);
validateDensity(density);
let pipelineFormat;
const pipelineOptions = {};
switch (v) {
case 'jpeg':
pipelineFormat = 'jpg';
break;
case 'tif':
pipelineFormat = 'tiff';
if (density) {
pipelineOptions.xres = density / 25.4;
pipelineOptions.yres = density / 25.4;
}
break;
default:
pipelineFormat = v;
}
this.pipeline = this.pipeline.toFormat(pipelineFormat, pipelineOptions);
if (density) {
this.pipeline = this.pipeline.withMetadata({ density: density });
}
return this;
}
withMetadata (v) {
if (v) this.pipeline = this.pipeline.withMetadata();
return this;
}
_regionSquare (dims) {
if (dims.width !== dims.height) {
const side = Math.min(dims.width, dims.height);
const params = { width: side, height: side };
const offset = Math.abs(Math.floor((dims.width - dims.height) / 2));
if (dims.width > dims.height) {
params.left = offset;
params.top = 0;
} else {
params.left = 0;
params.top = offset;
}
this.pipeline = this.pipeline.extract(params);
}
}
_regionPct (v, dims) {
let x, y, w, h;
[x, y, w, h] = v.split(/\s*,\s*/).map((pct) => {
return Number(pct) / 100.0;
});
[x, w] = [x, w].map((val) => Math.round(dims.width * val));
[y, h] = [y, h].map((val) => Math.round(dims.height * val));
this._regionXYWH([x, y, w, h]);
}
_regionXYWH (v) {
if (typeof v === 'string') {
v = v.split(/\s*,\s*/).map((val) => Number(val));
}
const params = { left: v[0], top: v[1], width: v[2], height: v[3] };
if (params.width === 0 || params.height === 0) {
throw new IIIFError('Region width and height must both be > 0');
}
this.pipeline = this.pipeline.extract(params);
}
_sizePct (v, dims) {
const pct = Number(v);
if (isNaN(pct) || pct <= 0) {
throw new IIIFError(`Invalid resize %: ${v}`);
}
const width = Math.round(dims.width * (pct / 100.0));
this._sizeWH(`${width},`);
}
_sizeWH (v) {
const params = { fit: 'cover' };
if (typeof v === 'string') {
if (v[0] === '!') {
params.fit = 'inside';
}
v = v
.replace(/^!/, '')
.split(/\s*,\s*/)
.map((val) => (val === '' ? null : Number(val)));
}
[params.width, params.height] = v;
if (params.width === 0 || params.height === 0) {
throw new IIIFError('Resize width and height must both be > 0');
}
this.pipeline = this.pipeline.resize(params);
}
}
module.exports = {
Qualities: Validators.quality,
Formats: Validators.format,
Operations,
IIIFError
};
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