index.js
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import { PNG } from 'pngjs';
import { throwError, isNodePattern } from '@jimp/utils';
const MIME_TYPE = 'image/png';
// PNG filter types
const PNG_FILTER_AUTO = -1;
const PNG_FILTER_NONE = 0;
const PNG_FILTER_SUB = 1;
const PNG_FILTER_UP = 2;
const PNG_FILTER_AVERAGE = 3;
const PNG_FILTER_PATH = 4;
export default () => ({
mime: { [MIME_TYPE]: ['png'] },
constants: {
MIME_PNG: MIME_TYPE,
PNG_FILTER_AUTO,
PNG_FILTER_NONE,
PNG_FILTER_SUB,
PNG_FILTER_UP,
PNG_FILTER_AVERAGE,
PNG_FILTER_PATH
},
hasAlpha: { [MIME_TYPE]: true },
decoders: { [MIME_TYPE]: PNG.sync.read },
encoders: {
[MIME_TYPE]: data => {
const png = new PNG({
width: data.bitmap.width,
height: data.bitmap.height
});
png.data = data.bitmap.data;
return PNG.sync.write(png, {
width: data.bitmap.width,
height: data.bitmap.height,
deflateLevel: data._deflateLevel,
deflateStrategy: data._deflateStrategy,
filterType: data._filterType,
colorType:
typeof data._colorType === 'number'
? data._colorType
: data._rgba
? 6
: 2,
inputHasAlpha: data._rgba
});
}
},
class: {
_deflateLevel: 9,
_deflateStrategy: 3,
_filterType: PNG_FILTER_AUTO,
_colorType: null,
/**
* Sets the deflate level used when saving as PNG format (default is 9)
* @param {number} l Deflate level to use 0-9. 0 is no compression. 9 (default) is maximum compression.
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
deflateLevel(l, cb) {
if (typeof l !== 'number') {
return throwError.call(this, 'l must be a number', cb);
}
if (l < 0 || l > 9) {
return throwError.call(this, 'l must be a number 0 - 9', cb);
}
this._deflateLevel = Math.round(l);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
},
/**
* Sets the deflate strategy used when saving as PNG format (default is 3)
* @param {number} s Deflate strategy to use 0-3.
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
deflateStrategy(s, cb) {
if (typeof s !== 'number') {
return throwError.call(this, 's must be a number', cb);
}
if (s < 0 || s > 3) {
return throwError.call(this, 's must be a number 0 - 3', cb);
}
this._deflateStrategy = Math.round(s);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
},
/**
* Sets the filter type used when saving as PNG format (default is automatic filters)
* @param {number} f The quality to use -1-4.
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
filterType(f, cb) {
if (typeof f !== 'number') {
return throwError.call(this, 'n must be a number', cb);
}
if (f < -1 || f > 4) {
return throwError.call(
this,
'n must be -1 (auto) or a number 0 - 4',
cb
);
}
this._filterType = Math.round(f);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
},
/**
* Sets the color type used when saving as PNG format
* @param {number} s color type to use 0, 2, 4, 6.
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/ colorType(s, cb) {
if (typeof s !== 'number') {
return throwError.call(this, 's must be a number', cb);
}
if (s !== 0 && s !== 2 && s !== 4 && s !== 6) {
return throwError.call(this, 's must be a number 0, 2, 4, 6.', cb);
}
this._colorType = Math.round(s);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
}
}
});