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const fs = require('fs');
const JPEG = require('jpeg-js');
const PNG_LIB = require('pngjs')
const PNG = PNG_LIB.PNG;
const text = require('./text');
const uint32 = require('./uint32');
/**
* Create a new bitmap image
*
* @param {number} w Image width
* @param {number} h Image height
* @param {object} options Options to be passed to {@link Bitmap}
*
* @returns {Bitmap}
*/
exports.make = function(w,h,options) {
return new Bitmap(w,h,options);
};
/**
* Encode the PNG image to output stream
*
* @param {Bitmap} bitmap An instance of {@link Bitmap} to be encoded to PNG, `bitmap.data` must be a buffer of raw PNG data
* @param {Stream} outstream The stream to write the PNG file to
*
* @returns {Promise<void>}
*/
exports.encodePNGToStream = function(bitmap, outstream) {
return new Promise((res,rej)=>{
if(!bitmap.hasOwnProperty('data') || !bitmap.hasOwnProperty('width') || !bitmap.hasOwnProperty('height')) {
rej(new TypeError('Invalid bitmap image provided'));
}
var png = new PNG({
width:bitmap.width,
height:bitmap.height
});
for(var i=0; i<bitmap.width; i++) {
for(var j=0; j<bitmap.height; j++) {
var rgba = bitmap.getPixelRGBA(i,j);
var n = (j*bitmap.width+i)*4;
var bytes = uint32.getBytesBigEndian(rgba);
for(var k=0; k<4; k++) {
png.data[n+k] = bytes[k];
}
}
}
png
.on('error', (err) => { rej(err); })
.pack()
.pipe(outstream)
.on('finish', () => { res(); })
.on('error', (err) => { rej(err); });
});
}
/**
* Encode JPEG To Stream
*
* Encode the JPEG image to output stream
*
* @param {Bitmap} img An instance of {@link Bitmap} to be encoded to JPEG, `img.data` must be a buffer of raw JPEG data
* @param {Stream} outstream The stream to write the raw JPEG buffer to
* @param {Int} Number between 0 and 100 setting the JPEG quality
* @returns {Promise<void>}
*/
exports.encodeJPEGToStream = function(img, outstream, quality) {
quality = quality || 90;
return new Promise((res,rej)=> {
if(!img.hasOwnProperty('data') || !img.hasOwnProperty('width') || !img.hasOwnProperty('height')) {
rej(new TypeError('Invalid bitmap image provided'));
}
var data = {
data: img.data,
width: img.width,
height: img.height
};
outstream.on('error', (err) => rej(err));
outstream.write(JPEG.encode(data, quality).data, () => {
outstream.end();
res();
});
});
};
/**
* Decode JPEG From Stream
*
* Decode a JPEG image from an incoming stream of data
*
* @param {Stream} data A readable stream to decode JPEG data from
*
* @returns {Promise<Bitmap>}
*/
exports.decodeJPEGFromStream = function(data) {
return new Promise((res,rej)=>{
try {
var chunks = [];
data.on('data', chunk => chunks.push(chunk));
data.on('end',() => {
var buf = Buffer.concat(chunks);
var rawImageData = JPEG.decode(buf);
var bitmap = new Bitmap(rawImageData.width, rawImageData.height);
for (var x_axis = 0; x_axis < rawImageData.width; x_axis++) {
for (var y_axis = 0; y_axis < rawImageData.height; y_axis++) {
var n = (y_axis * rawImageData.width + x_axis) * 4;
bitmap.setPixelRGBA_i(x_axis, y_axis,
rawImageData.data[n + 0],
rawImageData.data[n + 1],
rawImageData.data[n + 2],
rawImageData.data[n + 3]
);
}
}
res(bitmap);
});
data.on("error", (err) => {
rej(err);
});
} catch (e) {
console.log(e);
rej(e);
}
});
};
/**
* Decode PNG From Stream
*
* Decode a PNG file from an incoming readable stream
*
* @param {Stream} instream A readable stream containing raw PNG data
*
* @returns {Promise<Bitmap>}
*/
exports.decodePNGFromStream = function(instream) {
return new Promise((res,rej)=>{
instream.pipe(new PNG())
.on("parsed", function() {
var bitmap = new Bitmap(this.width,this.height);
for(var i=0; i<bitmap.data.length; i++) {
bitmap.data[i] = this.data[i];
};
res(bitmap);
}).on("error", function(err) {
rej(err);
});
})
};
/**@ignore */
exports.registerFont = text.registerFont;
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