56 lines
935 B
JavaScript
56 lines
935 B
JavaScript
|
'use strict';
|
||
|
|
const execBuffer = require('exec-buffer');
|
||
|
|
const isPng = require('is-png');
|
||
|
|
const optipng = require('optipng-bin');
|
||
|
|
|
||
|
|
module.exports = opts => buf => {
|
||
|
|
opts = Object.assign({
|
||
|
|
optimizationLevel: 3,
|
||
|
|
bitDepthReduction: true,
|
||
|
|
colorTypeReduction: true,
|
||
|
|
paletteReduction: true
|
||
|
|
}, opts);
|
||
|
|
|
||
|
|
if (!Buffer.isBuffer(buf)) {
|
||
|
|
return Promise.reject(new TypeError('Expected a buffer'));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!isPng(buf)) {
|
||
|
|
return Promise.resolve(buf);
|
||
|
|
}
|
||
|
|
|
||
|
|
const args = [
|
||
|
|
'-strip',
|
||
|
|
'all',
|
||
|
|
'-clobber',
|
||
|
|
'-fix',
|
||
|
|
'-o',
|
||
|
|
opts.optimizationLevel,
|
||
|
|
'-out',
|
||
|
|
execBuffer.output
|
||
|
|
];
|
||
|
|
|
||
|
|
if (!opts.bitDepthReduction) {
|
||
|
|
args.push('-nb');
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!opts.colorTypeReduction) {
|
||
|
|
args.push('-nc');
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!opts.paletteReduction) {
|
||
|
|
args.push('-np');
|
||
|
|
}
|
||
|
|
|
||
|
|
args.push(execBuffer.input);
|
||
|
|
|
||
|
|
return execBuffer({
|
||
|
|
input: buf,
|
||
|
|
bin: optipng,
|
||
|
|
args
|
||
|
|
}).catch(error => {
|
||
|
|
error.message = error.stderr || error.message;
|
||
|
|
throw error;
|
||
|
|
});
|
||
|
|
};
|