File: /var/www/vhost/disk-apps/pwa.sports-crowd.com/node_modules/@stencil/core/screenshot/pixel-match.js
'use strict';
var fs = require('fs');
var util = require('util');
var Stream = require('stream');
var zlib = require('zlib');
var require$$0 = require('assert');
var require$$1 = require('buffer');
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var fs__default = /*#__PURE__*/_interopDefaultLegacy(fs);
var util__default = /*#__PURE__*/_interopDefaultLegacy(util);
var Stream__default = /*#__PURE__*/_interopDefaultLegacy(Stream);
var zlib__default = /*#__PURE__*/_interopDefaultLegacy(zlib);
var require$$0__default = /*#__PURE__*/_interopDefaultLegacy(require$$0);
var require$$1__default = /*#__PURE__*/_interopDefaultLegacy(require$$1);
var pixelmatch_1 = pixelmatch;
const defaultOptions = {
threshold: 0.1, // matching threshold (0 to 1); smaller is more sensitive
includeAA: false, // whether to skip anti-aliasing detection
alpha: 0.1, // opacity of original image in diff output
aaColor: [255, 255, 0], // color of anti-aliased pixels in diff output
diffColor: [255, 0, 0], // color of different pixels in diff output
diffColorAlt: null, // whether to detect dark on light differences between img1 and img2 and set an alternative color to differentiate between the two
diffMask: false // draw the diff over a transparent background (a mask)
};
function pixelmatch(img1, img2, output, width, height, options) {
if (!isPixelData(img1) || !isPixelData(img2) || (output && !isPixelData(output)))
throw new Error('Image data: Uint8Array, Uint8ClampedArray or Buffer expected.');
if (img1.length !== img2.length || (output && output.length !== img1.length))
throw new Error('Image sizes do not match.');
if (img1.length !== width * height * 4) throw new Error('Image data size does not match width/height.');
options = Object.assign({}, defaultOptions, options);
// check if images are identical
const len = width * height;
const a32 = new Uint32Array(img1.buffer, img1.byteOffset, len);
const b32 = new Uint32Array(img2.buffer, img2.byteOffset, len);
let identical = true;
for (let i = 0; i < len; i++) {
if (a32[i] !== b32[i]) { identical = false; break; }
}
if (identical) { // fast path if identical
if (output && !options.diffMask) {
for (let i = 0; i < len; i++) drawGrayPixel(img1, 4 * i, options.alpha, output);
}
return 0;
}
// maximum acceptable square distance between two colors;
// 35215 is the maximum possible value for the YIQ difference metric
const maxDelta = 35215 * options.threshold * options.threshold;
let diff = 0;
// compare each pixel of one image against the other one
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const pos = (y * width + x) * 4;
// squared YUV distance between colors at this pixel position, negative if the img2 pixel is darker
const delta = colorDelta(img1, img2, pos, pos);
// the color difference is above the threshold
if (Math.abs(delta) > maxDelta) {
// check it's a real rendering difference or just anti-aliasing
if (!options.includeAA && (antialiased(img1, x, y, width, height, img2) ||
antialiased(img2, x, y, width, height, img1))) {
// one of the pixels is anti-aliasing; draw as yellow and do not count as difference
// note that we do not include such pixels in a mask
if (output && !options.diffMask) drawPixel(output, pos, ...options.aaColor);
} else {
// found substantial difference not caused by anti-aliasing; draw it as such
if (output) {
drawPixel(output, pos, ...(delta < 0 && options.diffColorAlt || options.diffColor));
}
diff++;
}
} else if (output) {
// pixels are similar; draw background as grayscale image blended with white
if (!options.diffMask) drawGrayPixel(img1, pos, options.alpha, output);
}
}
}
// return the number of different pixels
return diff;
}
function isPixelData(arr) {
// work around instanceof Uint8Array not working properly in some Jest environments
return ArrayBuffer.isView(arr) && arr.constructor.BYTES_PER_ELEMENT === 1;
}
// check if a pixel is likely a part of anti-aliasing;
// based on "Anti-aliased Pixel and Intensity Slope Detector" paper by V. Vysniauskas, 2009
function antialiased(img, x1, y1, width, height, img2) {
const x0 = Math.max(x1 - 1, 0);
const y0 = Math.max(y1 - 1, 0);
const x2 = Math.min(x1 + 1, width - 1);
const y2 = Math.min(y1 + 1, height - 1);
const pos = (y1 * width + x1) * 4;
let zeroes = x1 === x0 || x1 === x2 || y1 === y0 || y1 === y2 ? 1 : 0;
let min = 0;
let max = 0;
let minX, minY, maxX, maxY;
// go through 8 adjacent pixels
for (let x = x0; x <= x2; x++) {
for (let y = y0; y <= y2; y++) {
if (x === x1 && y === y1) continue;
// brightness delta between the center pixel and adjacent one
const delta = colorDelta(img, img, pos, (y * width + x) * 4, true);
// count the number of equal, darker and brighter adjacent pixels
if (delta === 0) {
zeroes++;
// if found more than 2 equal siblings, it's definitely not anti-aliasing
if (zeroes > 2) return false;
// remember the darkest pixel
} else if (delta < min) {
min = delta;
minX = x;
minY = y;
// remember the brightest pixel
} else if (delta > max) {
max = delta;
maxX = x;
maxY = y;
}
}
}
// if there are no both darker and brighter pixels among siblings, it's not anti-aliasing
if (min === 0 || max === 0) return false;
// if either the darkest or the brightest pixel has 3+ equal siblings in both images
// (definitely not anti-aliased), this pixel is anti-aliased
return (hasManySiblings(img, minX, minY, width, height) && hasManySiblings(img2, minX, minY, width, height)) ||
(hasManySiblings(img, maxX, maxY, width, height) && hasManySiblings(img2, maxX, maxY, width, height));
}
// check if a pixel has 3+ adjacent pixels of the same color.
function hasManySiblings(img, x1, y1, width, height) {
const x0 = Math.max(x1 - 1, 0);
const y0 = Math.max(y1 - 1, 0);
const x2 = Math.min(x1 + 1, width - 1);
const y2 = Math.min(y1 + 1, height - 1);
const pos = (y1 * width + x1) * 4;
let zeroes = x1 === x0 || x1 === x2 || y1 === y0 || y1 === y2 ? 1 : 0;
// go through 8 adjacent pixels
for (let x = x0; x <= x2; x++) {
for (let y = y0; y <= y2; y++) {
if (x === x1 && y === y1) continue;
const pos2 = (y * width + x) * 4;
if (img[pos] === img[pos2] &&
img[pos + 1] === img[pos2 + 1] &&
img[pos + 2] === img[pos2 + 2] &&
img[pos + 3] === img[pos2 + 3]) zeroes++;
if (zeroes > 2) return true;
}
}
return false;
}
// calculate color difference according to the paper "Measuring perceived color difference
// using YIQ NTSC transmission color space in mobile applications" by Y. Kotsarenko and F. Ramos
function colorDelta(img1, img2, k, m, yOnly) {
let r1 = img1[k + 0];
let g1 = img1[k + 1];
let b1 = img1[k + 2];
let a1 = img1[k + 3];
let r2 = img2[m + 0];
let g2 = img2[m + 1];
let b2 = img2[m + 2];
let a2 = img2[m + 3];
if (a1 === a2 && r1 === r2 && g1 === g2 && b1 === b2) return 0;
if (a1 < 255) {
a1 /= 255;
r1 = blend(r1, a1);
g1 = blend(g1, a1);
b1 = blend(b1, a1);
}
if (a2 < 255) {
a2 /= 255;
r2 = blend(r2, a2);
g2 = blend(g2, a2);
b2 = blend(b2, a2);
}
const y1 = rgb2y(r1, g1, b1);
const y2 = rgb2y(r2, g2, b2);
const y = y1 - y2;
if (yOnly) return y; // brightness difference only
const i = rgb2i(r1, g1, b1) - rgb2i(r2, g2, b2);
const q = rgb2q(r1, g1, b1) - rgb2q(r2, g2, b2);
const delta = 0.5053 * y * y + 0.299 * i * i + 0.1957 * q * q;
// encode whether the pixel lightens or darkens in the sign
return y1 > y2 ? -delta : delta;
}
function rgb2y(r, g, b) { return r * 0.29889531 + g * 0.58662247 + b * 0.11448223; }
function rgb2i(r, g, b) { return r * 0.59597799 - g * 0.27417610 - b * 0.32180189; }
function rgb2q(r, g, b) { return r * 0.21147017 - g * 0.52261711 + b * 0.31114694; }
// blend semi-transparent color with white
function blend(c, a) {
return 255 + (c - 255) * a;
}
function drawPixel(output, pos, r, g, b) {
output[pos + 0] = r;
output[pos + 1] = g;
output[pos + 2] = b;
output[pos + 3] = 255;
}
function drawGrayPixel(img, i, alpha, output) {
const r = img[i + 0];
const g = img[i + 1];
const b = img[i + 2];
const val = blend(rgb2y(r, g, b), alpha * img[i + 3] / 255);
drawPixel(output, i, val, val, val);
}
function createCommonjsModule(fn, basedir, module) {
return module = {
path: basedir,
exports: {},
require: function (path, base) {
return commonjsRequire(path, (base === undefined || base === null) ? module.path : base);
}
}, fn(module, module.exports), module.exports;
}
function commonjsRequire () {
throw new Error('Dynamic requires are not currently supported by @rollup/plugin-commonjs');
}
var chunkstream = createCommonjsModule(function (module) {
let ChunkStream = (module.exports = function () {
Stream__default['default'].call(this);
this._buffers = [];
this._buffered = 0;
this._reads = [];
this._paused = false;
this._encoding = "utf8";
this.writable = true;
});
util__default['default'].inherits(ChunkStream, Stream__default['default']);
ChunkStream.prototype.read = function (length, callback) {
this._reads.push({
length: Math.abs(length), // if length < 0 then at most this length
allowLess: length < 0,
func: callback,
});
process.nextTick(
function () {
this._process();
// its paused and there is not enought data then ask for more
if (this._paused && this._reads && this._reads.length > 0) {
this._paused = false;
this.emit("drain");
}
}.bind(this)
);
};
ChunkStream.prototype.write = function (data, encoding) {
if (!this.writable) {
this.emit("error", new Error("Stream not writable"));
return false;
}
let dataBuffer;
if (Buffer.isBuffer(data)) {
dataBuffer = data;
} else {
dataBuffer = Buffer.from(data, encoding || this._encoding);
}
this._buffers.push(dataBuffer);
this._buffered += dataBuffer.length;
this._process();
// ok if there are no more read requests
if (this._reads && this._reads.length === 0) {
this._paused = true;
}
return this.writable && !this._paused;
};
ChunkStream.prototype.end = function (data, encoding) {
if (data) {
this.write(data, encoding);
}
this.writable = false;
// already destroyed
if (!this._buffers) {
return;
}
// enqueue or handle end
if (this._buffers.length === 0) {
this._end();
} else {
this._buffers.push(null);
this._process();
}
};
ChunkStream.prototype.destroySoon = ChunkStream.prototype.end;
ChunkStream.prototype._end = function () {
if (this._reads.length > 0) {
this.emit("error", new Error("Unexpected end of input"));
}
this.destroy();
};
ChunkStream.prototype.destroy = function () {
if (!this._buffers) {
return;
}
this.writable = false;
this._reads = null;
this._buffers = null;
this.emit("close");
};
ChunkStream.prototype._processReadAllowingLess = function (read) {
// ok there is any data so that we can satisfy this request
this._reads.shift(); // == read
// first we need to peek into first buffer
let smallerBuf = this._buffers[0];
// ok there is more data than we need
if (smallerBuf.length > read.length) {
this._buffered -= read.length;
this._buffers[0] = smallerBuf.slice(read.length);
read.func.call(this, smallerBuf.slice(0, read.length));
} else {
// ok this is less than maximum length so use it all
this._buffered -= smallerBuf.length;
this._buffers.shift(); // == smallerBuf
read.func.call(this, smallerBuf);
}
};
ChunkStream.prototype._processRead = function (read) {
this._reads.shift(); // == read
let pos = 0;
let count = 0;
let data = Buffer.alloc(read.length);
// create buffer for all data
while (pos < read.length) {
let buf = this._buffers[count++];
let len = Math.min(buf.length, read.length - pos);
buf.copy(data, pos, 0, len);
pos += len;
// last buffer wasn't used all so just slice it and leave
if (len !== buf.length) {
this._buffers[--count] = buf.slice(len);
}
}
// remove all used buffers
if (count > 0) {
this._buffers.splice(0, count);
}
this._buffered -= read.length;
read.func.call(this, data);
};
ChunkStream.prototype._process = function () {
try {
// as long as there is any data and read requests
while (this._buffered > 0 && this._reads && this._reads.length > 0) {
let read = this._reads[0];
// read any data (but no more than length)
if (read.allowLess) {
this._processReadAllowingLess(read);
} else if (this._buffered >= read.length) {
// ok we can meet some expectations
this._processRead(read);
} else {
// not enought data to satisfy first request in queue
// so we need to wait for more
break;
}
}
if (this._buffers && !this.writable) {
this._end();
}
} catch (ex) {
this.emit("error", ex);
}
};
});
// Adam 7
// 0 1 2 3 4 5 6 7
// 0 x 6 4 6 x 6 4 6
// 1 7 7 7 7 7 7 7 7
// 2 5 6 5 6 5 6 5 6
// 3 7 7 7 7 7 7 7 7
// 4 3 6 4 6 3 6 4 6
// 5 7 7 7 7 7 7 7 7
// 6 5 6 5 6 5 6 5 6
// 7 7 7 7 7 7 7 7 7
let imagePasses = [
{
// pass 1 - 1px
x: [0],
y: [0],
},
{
// pass 2 - 1px
x: [4],
y: [0],
},
{
// pass 3 - 2px
x: [0, 4],
y: [4],
},
{
// pass 4 - 4px
x: [2, 6],
y: [0, 4],
},
{
// pass 5 - 8px
x: [0, 2, 4, 6],
y: [2, 6],
},
{
// pass 6 - 16px
x: [1, 3, 5, 7],
y: [0, 2, 4, 6],
},
{
// pass 7 - 32px
x: [0, 1, 2, 3, 4, 5, 6, 7],
y: [1, 3, 5, 7],
},
];
var getImagePasses = function (width, height) {
let images = [];
let xLeftOver = width % 8;
let yLeftOver = height % 8;
let xRepeats = (width - xLeftOver) / 8;
let yRepeats = (height - yLeftOver) / 8;
for (let i = 0; i < imagePasses.length; i++) {
let pass = imagePasses[i];
let passWidth = xRepeats * pass.x.length;
let passHeight = yRepeats * pass.y.length;
for (let j = 0; j < pass.x.length; j++) {
if (pass.x[j] < xLeftOver) {
passWidth++;
} else {
break;
}
}
for (let j = 0; j < pass.y.length; j++) {
if (pass.y[j] < yLeftOver) {
passHeight++;
} else {
break;
}
}
if (passWidth > 0 && passHeight > 0) {
images.push({ width: passWidth, height: passHeight, index: i });
}
}
return images;
};
var getInterlaceIterator = function (width) {
return function (x, y, pass) {
let outerXLeftOver = x % imagePasses[pass].x.length;
let outerX =
((x - outerXLeftOver) / imagePasses[pass].x.length) * 8 +
imagePasses[pass].x[outerXLeftOver];
let outerYLeftOver = y % imagePasses[pass].y.length;
let outerY =
((y - outerYLeftOver) / imagePasses[pass].y.length) * 8 +
imagePasses[pass].y[outerYLeftOver];
return outerX * 4 + outerY * width * 4;
};
};
var interlace = {
getImagePasses: getImagePasses,
getInterlaceIterator: getInterlaceIterator
};
var paethPredictor = function paethPredictor(left, above, upLeft) {
let paeth = left + above - upLeft;
let pLeft = Math.abs(paeth - left);
let pAbove = Math.abs(paeth - above);
let pUpLeft = Math.abs(paeth - upLeft);
if (pLeft <= pAbove && pLeft <= pUpLeft) {
return left;
}
if (pAbove <= pUpLeft) {
return above;
}
return upLeft;
};
var filterParse = createCommonjsModule(function (module) {
function getByteWidth(width, bpp, depth) {
let byteWidth = width * bpp;
if (depth !== 8) {
byteWidth = Math.ceil(byteWidth / (8 / depth));
}
return byteWidth;
}
let Filter = (module.exports = function (bitmapInfo, dependencies) {
let width = bitmapInfo.width;
let height = bitmapInfo.height;
let interlace$1 = bitmapInfo.interlace;
let bpp = bitmapInfo.bpp;
let depth = bitmapInfo.depth;
this.read = dependencies.read;
this.write = dependencies.write;
this.complete = dependencies.complete;
this._imageIndex = 0;
this._images = [];
if (interlace$1) {
let passes = interlace.getImagePasses(width, height);
for (let i = 0; i < passes.length; i++) {
this._images.push({
byteWidth: getByteWidth(passes[i].width, bpp, depth),
height: passes[i].height,
lineIndex: 0,
});
}
} else {
this._images.push({
byteWidth: getByteWidth(width, bpp, depth),
height: height,
lineIndex: 0,
});
}
// when filtering the line we look at the pixel to the left
// the spec also says it is done on a byte level regardless of the number of pixels
// so if the depth is byte compatible (8 or 16) we subtract the bpp in order to compare back
// a pixel rather than just a different byte part. However if we are sub byte, we ignore.
if (depth === 8) {
this._xComparison = bpp;
} else if (depth === 16) {
this._xComparison = bpp * 2;
} else {
this._xComparison = 1;
}
});
Filter.prototype.start = function () {
this.read(
this._images[this._imageIndex].byteWidth + 1,
this._reverseFilterLine.bind(this)
);
};
Filter.prototype._unFilterType1 = function (
rawData,
unfilteredLine,
byteWidth
) {
let xComparison = this._xComparison;
let xBiggerThan = xComparison - 1;
for (let x = 0; x < byteWidth; x++) {
let rawByte = rawData[1 + x];
let f1Left = x > xBiggerThan ? unfilteredLine[x - xComparison] : 0;
unfilteredLine[x] = rawByte + f1Left;
}
};
Filter.prototype._unFilterType2 = function (
rawData,
unfilteredLine,
byteWidth
) {
let lastLine = this._lastLine;
for (let x = 0; x < byteWidth; x++) {
let rawByte = rawData[1 + x];
let f2Up = lastLine ? lastLine[x] : 0;
unfilteredLine[x] = rawByte + f2Up;
}
};
Filter.prototype._unFilterType3 = function (
rawData,
unfilteredLine,
byteWidth
) {
let xComparison = this._xComparison;
let xBiggerThan = xComparison - 1;
let lastLine = this._lastLine;
for (let x = 0; x < byteWidth; x++) {
let rawByte = rawData[1 + x];
let f3Up = lastLine ? lastLine[x] : 0;
let f3Left = x > xBiggerThan ? unfilteredLine[x - xComparison] : 0;
let f3Add = Math.floor((f3Left + f3Up) / 2);
unfilteredLine[x] = rawByte + f3Add;
}
};
Filter.prototype._unFilterType4 = function (
rawData,
unfilteredLine,
byteWidth
) {
let xComparison = this._xComparison;
let xBiggerThan = xComparison - 1;
let lastLine = this._lastLine;
for (let x = 0; x < byteWidth; x++) {
let rawByte = rawData[1 + x];
let f4Up = lastLine ? lastLine[x] : 0;
let f4Left = x > xBiggerThan ? unfilteredLine[x - xComparison] : 0;
let f4UpLeft = x > xBiggerThan && lastLine ? lastLine[x - xComparison] : 0;
let f4Add = paethPredictor(f4Left, f4Up, f4UpLeft);
unfilteredLine[x] = rawByte + f4Add;
}
};
Filter.prototype._reverseFilterLine = function (rawData) {
let filter = rawData[0];
let unfilteredLine;
let currentImage = this._images[this._imageIndex];
let byteWidth = currentImage.byteWidth;
if (filter === 0) {
unfilteredLine = rawData.slice(1, byteWidth + 1);
} else {
unfilteredLine = Buffer.alloc(byteWidth);
switch (filter) {
case 1:
this._unFilterType1(rawData, unfilteredLine, byteWidth);
break;
case 2:
this._unFilterType2(rawData, unfilteredLine, byteWidth);
break;
case 3:
this._unFilterType3(rawData, unfilteredLine, byteWidth);
break;
case 4:
this._unFilterType4(rawData, unfilteredLine, byteWidth);
break;
default:
throw new Error("Unrecognised filter type - " + filter);
}
}
this.write(unfilteredLine);
currentImage.lineIndex++;
if (currentImage.lineIndex >= currentImage.height) {
this._lastLine = null;
this._imageIndex++;
currentImage = this._images[this._imageIndex];
} else {
this._lastLine = unfilteredLine;
}
if (currentImage) {
// read, using the byte width that may be from the new current image
this.read(currentImage.byteWidth + 1, this._reverseFilterLine.bind(this));
} else {
this._lastLine = null;
this.complete();
}
};
});
var filterParseAsync = createCommonjsModule(function (module) {
let FilterAsync = (module.exports = function (bitmapInfo) {
chunkstream.call(this);
let buffers = [];
let that = this;
this._filter = new filterParse(bitmapInfo, {
read: this.read.bind(this),
write: function (buffer) {
buffers.push(buffer);
},
complete: function () {
that.emit("complete", Buffer.concat(buffers));
},
});
this._filter.start();
});
util__default['default'].inherits(FilterAsync, chunkstream);
});
var constants = {
PNG_SIGNATURE: [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a],
TYPE_IHDR: 0x49484452,
TYPE_IEND: 0x49454e44,
TYPE_IDAT: 0x49444154,
TYPE_PLTE: 0x504c5445,
TYPE_tRNS: 0x74524e53, // eslint-disable-line camelcase
TYPE_gAMA: 0x67414d41, // eslint-disable-line camelcase
// color-type bits
COLORTYPE_GRAYSCALE: 0,
COLORTYPE_PALETTE: 1,
COLORTYPE_COLOR: 2,
COLORTYPE_ALPHA: 4, // e.g. grayscale and alpha
// color-type combinations
COLORTYPE_PALETTE_COLOR: 3,
COLORTYPE_COLOR_ALPHA: 6,
COLORTYPE_TO_BPP_MAP: {
0: 1,
2: 3,
3: 1,
4: 2,
6: 4,
},
GAMMA_DIVISION: 100000,
};
var crc = createCommonjsModule(function (module) {
let crcTable = [];
(function () {
for (let i = 0; i < 256; i++) {
let currentCrc = i;
for (let j = 0; j < 8; j++) {
if (currentCrc & 1) {
currentCrc = 0xedb88320 ^ (currentCrc >>> 1);
} else {
currentCrc = currentCrc >>> 1;
}
}
crcTable[i] = currentCrc;
}
})();
let CrcCalculator = (module.exports = function () {
this._crc = -1;
});
CrcCalculator.prototype.write = function (data) {
for (let i = 0; i < data.length; i++) {
this._crc = crcTable[(this._crc ^ data[i]) & 0xff] ^ (this._crc >>> 8);
}
return true;
};
CrcCalculator.prototype.crc32 = function () {
return this._crc ^ -1;
};
CrcCalculator.crc32 = function (buf) {
let crc = -1;
for (let i = 0; i < buf.length; i++) {
crc = crcTable[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
}
return crc ^ -1;
};
});
var parser = createCommonjsModule(function (module) {
let Parser = (module.exports = function (options, dependencies) {
this._options = options;
options.checkCRC = options.checkCRC !== false;
this._hasIHDR = false;
this._hasIEND = false;
this._emittedHeadersFinished = false;
// input flags/metadata
this._palette = [];
this._colorType = 0;
this._chunks = {};
this._chunks[constants.TYPE_IHDR] = this._handleIHDR.bind(this);
this._chunks[constants.TYPE_IEND] = this._handleIEND.bind(this);
this._chunks[constants.TYPE_IDAT] = this._handleIDAT.bind(this);
this._chunks[constants.TYPE_PLTE] = this._handlePLTE.bind(this);
this._chunks[constants.TYPE_tRNS] = this._handleTRNS.bind(this);
this._chunks[constants.TYPE_gAMA] = this._handleGAMA.bind(this);
this.read = dependencies.read;
this.error = dependencies.error;
this.metadata = dependencies.metadata;
this.gamma = dependencies.gamma;
this.transColor = dependencies.transColor;
this.palette = dependencies.palette;
this.parsed = dependencies.parsed;
this.inflateData = dependencies.inflateData;
this.finished = dependencies.finished;
this.simpleTransparency = dependencies.simpleTransparency;
this.headersFinished = dependencies.headersFinished || function () {};
});
Parser.prototype.start = function () {
this.read(constants.PNG_SIGNATURE.length, this._parseSignature.bind(this));
};
Parser.prototype._parseSignature = function (data) {
let signature = constants.PNG_SIGNATURE;
for (let i = 0; i < signature.length; i++) {
if (data[i] !== signature[i]) {
this.error(new Error("Invalid file signature"));
return;
}
}
this.read(8, this._parseChunkBegin.bind(this));
};
Parser.prototype._parseChunkBegin = function (data) {
// chunk content length
let length = data.readUInt32BE(0);
// chunk type
let type = data.readUInt32BE(4);
let name = "";
for (let i = 4; i < 8; i++) {
name += String.fromCharCode(data[i]);
}
//console.log('chunk ', name, length);
// chunk flags
let ancillary = Boolean(data[4] & 0x20); // or critical
// priv = Boolean(data[5] & 0x20), // or public
// safeToCopy = Boolean(data[7] & 0x20); // or unsafe
if (!this._hasIHDR && type !== constants.TYPE_IHDR) {
this.error(new Error("Expected IHDR on beggining"));
return;
}
this._crc = new crc();
this._crc.write(Buffer.from(name));
if (this._chunks[type]) {
return this._chunks[type](length);
}
if (!ancillary) {
this.error(new Error("Unsupported critical chunk type " + name));
return;
}
this.read(length + 4, this._skipChunk.bind(this));
};
Parser.prototype._skipChunk = function (/*data*/) {
this.read(8, this._parseChunkBegin.bind(this));
};
Parser.prototype._handleChunkEnd = function () {
this.read(4, this._parseChunkEnd.bind(this));
};
Parser.prototype._parseChunkEnd = function (data) {
let fileCrc = data.readInt32BE(0);
let calcCrc = this._crc.crc32();
// check CRC
if (this._options.checkCRC && calcCrc !== fileCrc) {
this.error(new Error("Crc error - " + fileCrc + " - " + calcCrc));
return;
}
if (!this._hasIEND) {
this.read(8, this._parseChunkBegin.bind(this));
}
};
Parser.prototype._handleIHDR = function (length) {
this.read(length, this._parseIHDR.bind(this));
};
Parser.prototype._parseIHDR = function (data) {
this._crc.write(data);
let width = data.readUInt32BE(0);
let height = data.readUInt32BE(4);
let depth = data[8];
let colorType = data[9]; // bits: 1 palette, 2 color, 4 alpha
let compr = data[10];
let filter = data[11];
let interlace = data[12];
// console.log(' width', width, 'height', height,
// 'depth', depth, 'colorType', colorType,
// 'compr', compr, 'filter', filter, 'interlace', interlace
// );
if (
depth !== 8 &&
depth !== 4 &&
depth !== 2 &&
depth !== 1 &&
depth !== 16
) {
this.error(new Error("Unsupported bit depth " + depth));
return;
}
if (!(colorType in constants.COLORTYPE_TO_BPP_MAP)) {
this.error(new Error("Unsupported color type"));
return;
}
if (compr !== 0) {
this.error(new Error("Unsupported compression method"));
return;
}
if (filter !== 0) {
this.error(new Error("Unsupported filter method"));
return;
}
if (interlace !== 0 && interlace !== 1) {
this.error(new Error("Unsupported interlace method"));
return;
}
this._colorType = colorType;
let bpp = constants.COLORTYPE_TO_BPP_MAP[this._colorType];
this._hasIHDR = true;
this.metadata({
width: width,
height: height,
depth: depth,
interlace: Boolean(interlace),
palette: Boolean(colorType & constants.COLORTYPE_PALETTE),
color: Boolean(colorType & constants.COLORTYPE_COLOR),
alpha: Boolean(colorType & constants.COLORTYPE_ALPHA),
bpp: bpp,
colorType: colorType,
});
this._handleChunkEnd();
};
Parser.prototype._handlePLTE = function (length) {
this.read(length, this._parsePLTE.bind(this));
};
Parser.prototype._parsePLTE = function (data) {
this._crc.write(data);
let entries = Math.floor(data.length / 3);
// console.log('Palette:', entries);
for (let i = 0; i < entries; i++) {
this._palette.push([data[i * 3], data[i * 3 + 1], data[i * 3 + 2], 0xff]);
}
this.palette(this._palette);
this._handleChunkEnd();
};
Parser.prototype._handleTRNS = function (length) {
this.simpleTransparency();
this.read(length, this._parseTRNS.bind(this));
};
Parser.prototype._parseTRNS = function (data) {
this._crc.write(data);
// palette
if (this._colorType === constants.COLORTYPE_PALETTE_COLOR) {
if (this._palette.length === 0) {
this.error(new Error("Transparency chunk must be after palette"));
return;
}
if (data.length > this._palette.length) {
this.error(new Error("More transparent colors than palette size"));
return;
}
for (let i = 0; i < data.length; i++) {
this._palette[i][3] = data[i];
}
this.palette(this._palette);
}
// for colorType 0 (grayscale) and 2 (rgb)
// there might be one gray/color defined as transparent
if (this._colorType === constants.COLORTYPE_GRAYSCALE) {
// grey, 2 bytes
this.transColor([data.readUInt16BE(0)]);
}
if (this._colorType === constants.COLORTYPE_COLOR) {
this.transColor([
data.readUInt16BE(0),
data.readUInt16BE(2),
data.readUInt16BE(4),
]);
}
this._handleChunkEnd();
};
Parser.prototype._handleGAMA = function (length) {
this.read(length, this._parseGAMA.bind(this));
};
Parser.prototype._parseGAMA = function (data) {
this._crc.write(data);
this.gamma(data.readUInt32BE(0) / constants.GAMMA_DIVISION);
this._handleChunkEnd();
};
Parser.prototype._handleIDAT = function (length) {
if (!this._emittedHeadersFinished) {
this._emittedHeadersFinished = true;
this.headersFinished();
}
this.read(-length, this._parseIDAT.bind(this, length));
};
Parser.prototype._parseIDAT = function (length, data) {
this._crc.write(data);
if (
this._colorType === constants.COLORTYPE_PALETTE_COLOR &&
this._palette.length === 0
) {
throw new Error("Expected palette not found");
}
this.inflateData(data);
let leftOverLength = length - data.length;
if (leftOverLength > 0) {
this._handleIDAT(leftOverLength);
} else {
this._handleChunkEnd();
}
};
Parser.prototype._handleIEND = function (length) {
this.read(length, this._parseIEND.bind(this));
};
Parser.prototype._parseIEND = function (data) {
this._crc.write(data);
this._hasIEND = true;
this._handleChunkEnd();
if (this.finished) {
this.finished();
}
};
});
let pixelBppMapper = [
// 0 - dummy entry
function () {},
// 1 - L
// 0: 0, 1: 0, 2: 0, 3: 0xff
function (pxData, data, pxPos, rawPos) {
if (rawPos === data.length) {
throw new Error("Ran out of data");
}
let pixel = data[rawPos];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = 0xff;
},
// 2 - LA
// 0: 0, 1: 0, 2: 0, 3: 1
function (pxData, data, pxPos, rawPos) {
if (rawPos + 1 >= data.length) {
throw new Error("Ran out of data");
}
let pixel = data[rawPos];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = data[rawPos + 1];
},
// 3 - RGB
// 0: 0, 1: 1, 2: 2, 3: 0xff
function (pxData, data, pxPos, rawPos) {
if (rawPos + 2 >= data.length) {
throw new Error("Ran out of data");
}
pxData[pxPos] = data[rawPos];
pxData[pxPos + 1] = data[rawPos + 1];
pxData[pxPos + 2] = data[rawPos + 2];
pxData[pxPos + 3] = 0xff;
},
// 4 - RGBA
// 0: 0, 1: 1, 2: 2, 3: 3
function (pxData, data, pxPos, rawPos) {
if (rawPos + 3 >= data.length) {
throw new Error("Ran out of data");
}
pxData[pxPos] = data[rawPos];
pxData[pxPos + 1] = data[rawPos + 1];
pxData[pxPos + 2] = data[rawPos + 2];
pxData[pxPos + 3] = data[rawPos + 3];
},
];
let pixelBppCustomMapper = [
// 0 - dummy entry
function () {},
// 1 - L
// 0: 0, 1: 0, 2: 0, 3: 0xff
function (pxData, pixelData, pxPos, maxBit) {
let pixel = pixelData[0];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = maxBit;
},
// 2 - LA
// 0: 0, 1: 0, 2: 0, 3: 1
function (pxData, pixelData, pxPos) {
let pixel = pixelData[0];
pxData[pxPos] = pixel;
pxData[pxPos + 1] = pixel;
pxData[pxPos + 2] = pixel;
pxData[pxPos + 3] = pixelData[1];
},
// 3 - RGB
// 0: 0, 1: 1, 2: 2, 3: 0xff
function (pxData, pixelData, pxPos, maxBit) {
pxData[pxPos] = pixelData[0];
pxData[pxPos + 1] = pixelData[1];
pxData[pxPos + 2] = pixelData[2];
pxData[pxPos + 3] = maxBit;
},
// 4 - RGBA
// 0: 0, 1: 1, 2: 2, 3: 3
function (pxData, pixelData, pxPos) {
pxData[pxPos] = pixelData[0];
pxData[pxPos + 1] = pixelData[1];
pxData[pxPos + 2] = pixelData[2];
pxData[pxPos + 3] = pixelData[3];
},
];
function bitRetriever(data, depth) {
let leftOver = [];
let i = 0;
function split() {
if (i === data.length) {
throw new Error("Ran out of data");
}
let byte = data[i];
i++;
let byte8, byte7, byte6, byte5, byte4, byte3, byte2, byte1;
switch (depth) {
default:
throw new Error("unrecognised depth");
case 16:
byte2 = data[i];
i++;
leftOver.push((byte << 8) + byte2);
break;
case 4:
byte2 = byte & 0x0f;
byte1 = byte >> 4;
leftOver.push(byte1, byte2);
break;
case 2:
byte4 = byte & 3;
byte3 = (byte >> 2) & 3;
byte2 = (byte >> 4) & 3;
byte1 = (byte >> 6) & 3;
leftOver.push(byte1, byte2, byte3, byte4);
break;
case 1:
byte8 = byte & 1;
byte7 = (byte >> 1) & 1;
byte6 = (byte >> 2) & 1;
byte5 = (byte >> 3) & 1;
byte4 = (byte >> 4) & 1;
byte3 = (byte >> 5) & 1;
byte2 = (byte >> 6) & 1;
byte1 = (byte >> 7) & 1;
leftOver.push(byte1, byte2, byte3, byte4, byte5, byte6, byte7, byte8);
break;
}
}
return {
get: function (count) {
while (leftOver.length < count) {
split();
}
let returner = leftOver.slice(0, count);
leftOver = leftOver.slice(count);
return returner;
},
resetAfterLine: function () {
leftOver.length = 0;
},
end: function () {
if (i !== data.length) {
throw new Error("extra data found");
}
},
};
}
function mapImage8Bit(image, pxData, getPxPos, bpp, data, rawPos) {
// eslint-disable-line max-params
let imageWidth = image.width;
let imageHeight = image.height;
let imagePass = image.index;
for (let y = 0; y < imageHeight; y++) {
for (let x = 0; x < imageWidth; x++) {
let pxPos = getPxPos(x, y, imagePass);
pixelBppMapper[bpp](pxData, data, pxPos, rawPos);
rawPos += bpp; //eslint-disable-line no-param-reassign
}
}
return rawPos;
}
function mapImageCustomBit(image, pxData, getPxPos, bpp, bits, maxBit) {
// eslint-disable-line max-params
let imageWidth = image.width;
let imageHeight = image.height;
let imagePass = image.index;
for (let y = 0; y < imageHeight; y++) {
for (let x = 0; x < imageWidth; x++) {
let pixelData = bits.get(bpp);
let pxPos = getPxPos(x, y, imagePass);
pixelBppCustomMapper[bpp](pxData, pixelData, pxPos, maxBit);
}
bits.resetAfterLine();
}
}
var dataToBitMap = function (data, bitmapInfo) {
let width = bitmapInfo.width;
let height = bitmapInfo.height;
let depth = bitmapInfo.depth;
let bpp = bitmapInfo.bpp;
let interlace$1 = bitmapInfo.interlace;
let bits;
if (depth !== 8) {
bits = bitRetriever(data, depth);
}
let pxData;
if (depth <= 8) {
pxData = Buffer.alloc(width * height * 4);
} else {
pxData = new Uint16Array(width * height * 4);
}
let maxBit = Math.pow(2, depth) - 1;
let rawPos = 0;
let images;
let getPxPos;
if (interlace$1) {
images = interlace.getImagePasses(width, height);
getPxPos = interlace.getInterlaceIterator(width, height);
} else {
let nonInterlacedPxPos = 0;
getPxPos = function () {
let returner = nonInterlacedPxPos;
nonInterlacedPxPos += 4;
return returner;
};
images = [{ width: width, height: height }];
}
for (let imageIndex = 0; imageIndex < images.length; imageIndex++) {
if (depth === 8) {
rawPos = mapImage8Bit(
images[imageIndex],
pxData,
getPxPos,
bpp,
data,
rawPos
);
} else {
mapImageCustomBit(
images[imageIndex],
pxData,
getPxPos,
bpp,
bits,
maxBit
);
}
}
if (depth === 8) {
if (rawPos !== data.length) {
throw new Error("extra data found");
}
} else {
bits.end();
}
return pxData;
};
var bitmapper = {
dataToBitMap: dataToBitMap
};
function dePalette(indata, outdata, width, height, palette) {
let pxPos = 0;
// use values from palette
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
let color = palette[indata[pxPos]];
if (!color) {
throw new Error("index " + indata[pxPos] + " not in palette");
}
for (let i = 0; i < 4; i++) {
outdata[pxPos + i] = color[i];
}
pxPos += 4;
}
}
}
function replaceTransparentColor(indata, outdata, width, height, transColor) {
let pxPos = 0;
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
let makeTrans = false;
if (transColor.length === 1) {
if (transColor[0] === indata[pxPos]) {
makeTrans = true;
}
} else if (
transColor[0] === indata[pxPos] &&
transColor[1] === indata[pxPos + 1] &&
transColor[2] === indata[pxPos + 2]
) {
makeTrans = true;
}
if (makeTrans) {
for (let i = 0; i < 4; i++) {
outdata[pxPos + i] = 0;
}
}
pxPos += 4;
}
}
}
function scaleDepth(indata, outdata, width, height, depth) {
let maxOutSample = 255;
let maxInSample = Math.pow(2, depth) - 1;
let pxPos = 0;
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
for (let i = 0; i < 4; i++) {
outdata[pxPos + i] = Math.floor(
(indata[pxPos + i] * maxOutSample) / maxInSample + 0.5
);
}
pxPos += 4;
}
}
}
var formatNormaliser = function (indata, imageData, skipRescale = false) {
let depth = imageData.depth;
let width = imageData.width;
let height = imageData.height;
let colorType = imageData.colorType;
let transColor = imageData.transColor;
let palette = imageData.palette;
let outdata = indata; // only different for 16 bits
if (colorType === 3) {
// paletted
dePalette(indata, outdata, width, height, palette);
} else {
if (transColor) {
replaceTransparentColor(indata, outdata, width, height, transColor);
}
// if it needs scaling
if (depth !== 8 && !skipRescale) {
// if we need to change the buffer size
if (depth === 16) {
outdata = Buffer.alloc(width * height * 4);
}
scaleDepth(indata, outdata, width, height, depth);
}
}
return outdata;
};
var parserAsync = createCommonjsModule(function (module) {
let ParserAsync = (module.exports = function (options) {
chunkstream.call(this);
this._parser = new parser(options, {
read: this.read.bind(this),
error: this._handleError.bind(this),
metadata: this._handleMetaData.bind(this),
gamma: this.emit.bind(this, "gamma"),
palette: this._handlePalette.bind(this),
transColor: this._handleTransColor.bind(this),
finished: this._finished.bind(this),
inflateData: this._inflateData.bind(this),
simpleTransparency: this._simpleTransparency.bind(this),
headersFinished: this._headersFinished.bind(this),
});
this._options = options;
this.writable = true;
this._parser.start();
});
util__default['default'].inherits(ParserAsync, chunkstream);
ParserAsync.prototype._handleError = function (err) {
this.emit("error", err);
this.writable = false;
this.destroy();
if (this._inflate && this._inflate.destroy) {
this._inflate.destroy();
}
if (this._filter) {
this._filter.destroy();
// For backward compatibility with Node 7 and below.
// Suppress errors due to _inflate calling write() even after
// it's destroy()'ed.
this._filter.on("error", function () {});
}
this.errord = true;
};
ParserAsync.prototype._inflateData = function (data) {
if (!this._inflate) {
if (this._bitmapInfo.interlace) {
this._inflate = zlib__default['default'].createInflate();
this._inflate.on("error", this.emit.bind(this, "error"));
this._filter.on("complete", this._complete.bind(this));
this._inflate.pipe(this._filter);
} else {
let rowSize =
((this._bitmapInfo.width *
this._bitmapInfo.bpp *
this._bitmapInfo.depth +
7) >>
3) +
1;
let imageSize = rowSize * this._bitmapInfo.height;
let chunkSize = Math.max(imageSize, zlib__default['default'].Z_MIN_CHUNK);
this._inflate = zlib__default['default'].createInflate({ chunkSize: chunkSize });
let leftToInflate = imageSize;
let emitError = this.emit.bind(this, "error");
this._inflate.on("error", function (err) {
if (!leftToInflate) {
return;
}
emitError(err);
});
this._filter.on("complete", this._complete.bind(this));
let filterWrite = this._filter.write.bind(this._filter);
this._inflate.on("data", function (chunk) {
if (!leftToInflate) {
return;
}
if (chunk.length > leftToInflate) {
chunk = chunk.slice(0, leftToInflate);
}
leftToInflate -= chunk.length;
filterWrite(chunk);
});
this._inflate.on("end", this._filter.end.bind(this._filter));
}
}
this._inflate.write(data);
};
ParserAsync.prototype._handleMetaData = function (metaData) {
this._metaData = metaData;
this._bitmapInfo = Object.create(metaData);
this._filter = new filterParseAsync(this._bitmapInfo);
};
ParserAsync.prototype._handleTransColor = function (transColor) {
this._bitmapInfo.transColor = transColor;
};
ParserAsync.prototype._handlePalette = function (palette) {
this._bitmapInfo.palette = palette;
};
ParserAsync.prototype._simpleTransparency = function () {
this._metaData.alpha = true;
};
ParserAsync.prototype._headersFinished = function () {
// Up until this point, we don't know if we have a tRNS chunk (alpha)
// so we can't emit metadata any earlier
this.emit("metadata", this._metaData);
};
ParserAsync.prototype._finished = function () {
if (this.errord) {
return;
}
if (!this._inflate) {
this.emit("error", "No Inflate block");
} else {
// no more data to inflate
this._inflate.end();
}
};
ParserAsync.prototype._complete = function (filteredData) {
if (this.errord) {
return;
}
let normalisedBitmapData;
try {
let bitmapData = bitmapper.dataToBitMap(filteredData, this._bitmapInfo);
normalisedBitmapData = formatNormaliser(
bitmapData,
this._bitmapInfo,
this._options.skipRescale
);
bitmapData = null;
} catch (ex) {
this._handleError(ex);
return;
}
this.emit("parsed", normalisedBitmapData);
};
});
var bitpacker = function (dataIn, width, height, options) {
let outHasAlpha =
[constants.COLORTYPE_COLOR_ALPHA, constants.COLORTYPE_ALPHA].indexOf(
options.colorType
) !== -1;
if (options.colorType === options.inputColorType) {
let bigEndian = (function () {
let buffer = new ArrayBuffer(2);
new DataView(buffer).setInt16(0, 256, true /* littleEndian */);
// Int16Array uses the platform's endianness.
return new Int16Array(buffer)[0] !== 256;
})();
// If no need to convert to grayscale and alpha is present/absent in both, take a fast route
if (options.bitDepth === 8 || (options.bitDepth === 16 && bigEndian)) {
return dataIn;
}
}
// map to a UInt16 array if data is 16bit, fix endianness below
let data = options.bitDepth !== 16 ? dataIn : new Uint16Array(dataIn.buffer);
let maxValue = 255;
let inBpp = constants.COLORTYPE_TO_BPP_MAP[options.inputColorType];
if (inBpp === 4 && !options.inputHasAlpha) {
inBpp = 3;
}
let outBpp = constants.COLORTYPE_TO_BPP_MAP[options.colorType];
if (options.bitDepth === 16) {
maxValue = 65535;
outBpp *= 2;
}
let outData = Buffer.alloc(width * height * outBpp);
let inIndex = 0;
let outIndex = 0;
let bgColor = options.bgColor || {};
if (bgColor.red === undefined) {
bgColor.red = maxValue;
}
if (bgColor.green === undefined) {
bgColor.green = maxValue;
}
if (bgColor.blue === undefined) {
bgColor.blue = maxValue;
}
function getRGBA() {
let red;
let green;
let blue;
let alpha = maxValue;
switch (options.inputColorType) {
case constants.COLORTYPE_COLOR_ALPHA:
alpha = data[inIndex + 3];
red = data[inIndex];
green = data[inIndex + 1];
blue = data[inIndex + 2];
break;
case constants.COLORTYPE_COLOR:
red = data[inIndex];
green = data[inIndex + 1];
blue = data[inIndex + 2];
break;
case constants.COLORTYPE_ALPHA:
alpha = data[inIndex + 1];
red = data[inIndex];
green = red;
blue = red;
break;
case constants.COLORTYPE_GRAYSCALE:
red = data[inIndex];
green = red;
blue = red;
break;
default:
throw new Error(
"input color type:" +
options.inputColorType +
" is not supported at present"
);
}
if (options.inputHasAlpha) {
if (!outHasAlpha) {
alpha /= maxValue;
red = Math.min(
Math.max(Math.round((1 - alpha) * bgColor.red + alpha * red), 0),
maxValue
);
green = Math.min(
Math.max(Math.round((1 - alpha) * bgColor.green + alpha * green), 0),
maxValue
);
blue = Math.min(
Math.max(Math.round((1 - alpha) * bgColor.blue + alpha * blue), 0),
maxValue
);
}
}
return { red: red, green: green, blue: blue, alpha: alpha };
}
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
let rgba = getRGBA();
switch (options.colorType) {
case constants.COLORTYPE_COLOR_ALPHA:
case constants.COLORTYPE_COLOR:
if (options.bitDepth === 8) {
outData[outIndex] = rgba.red;
outData[outIndex + 1] = rgba.green;
outData[outIndex + 2] = rgba.blue;
if (outHasAlpha) {
outData[outIndex + 3] = rgba.alpha;
}
} else {
outData.writeUInt16BE(rgba.red, outIndex);
outData.writeUInt16BE(rgba.green, outIndex + 2);
outData.writeUInt16BE(rgba.blue, outIndex + 4);
if (outHasAlpha) {
outData.writeUInt16BE(rgba.alpha, outIndex + 6);
}
}
break;
case constants.COLORTYPE_ALPHA:
case constants.COLORTYPE_GRAYSCALE: {
// Convert to grayscale and alpha
let grayscale = (rgba.red + rgba.green + rgba.blue) / 3;
if (options.bitDepth === 8) {
outData[outIndex] = grayscale;
if (outHasAlpha) {
outData[outIndex + 1] = rgba.alpha;
}
} else {
outData.writeUInt16BE(grayscale, outIndex);
if (outHasAlpha) {
outData.writeUInt16BE(rgba.alpha, outIndex + 2);
}
}
break;
}
default:
throw new Error("unrecognised color Type " + options.colorType);
}
inIndex += inBpp;
outIndex += outBpp;
}
}
return outData;
};
function filterNone(pxData, pxPos, byteWidth, rawData, rawPos) {
for (let x = 0; x < byteWidth; x++) {
rawData[rawPos + x] = pxData[pxPos + x];
}
}
function filterSumNone(pxData, pxPos, byteWidth) {
let sum = 0;
let length = pxPos + byteWidth;
for (let i = pxPos; i < length; i++) {
sum += Math.abs(pxData[i]);
}
return sum;
}
function filterSub(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
for (let x = 0; x < byteWidth; x++) {
let left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
let val = pxData[pxPos + x] - left;
rawData[rawPos + x] = val;
}
}
function filterSumSub(pxData, pxPos, byteWidth, bpp) {
let sum = 0;
for (let x = 0; x < byteWidth; x++) {
let left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
let val = pxData[pxPos + x] - left;
sum += Math.abs(val);
}
return sum;
}
function filterUp(pxData, pxPos, byteWidth, rawData, rawPos) {
for (let x = 0; x < byteWidth; x++) {
let up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
let val = pxData[pxPos + x] - up;
rawData[rawPos + x] = val;
}
}
function filterSumUp(pxData, pxPos, byteWidth) {
let sum = 0;
let length = pxPos + byteWidth;
for (let x = pxPos; x < length; x++) {
let up = pxPos > 0 ? pxData[x - byteWidth] : 0;
let val = pxData[x] - up;
sum += Math.abs(val);
}
return sum;
}
function filterAvg(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
for (let x = 0; x < byteWidth; x++) {
let left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
let val = pxData[pxPos + x] - ((left + up) >> 1);
rawData[rawPos + x] = val;
}
}
function filterSumAvg(pxData, pxPos, byteWidth, bpp) {
let sum = 0;
for (let x = 0; x < byteWidth; x++) {
let left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
let val = pxData[pxPos + x] - ((left + up) >> 1);
sum += Math.abs(val);
}
return sum;
}
function filterPaeth(pxData, pxPos, byteWidth, rawData, rawPos, bpp) {
for (let x = 0; x < byteWidth; x++) {
let left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
let upleft =
pxPos > 0 && x >= bpp ? pxData[pxPos + x - (byteWidth + bpp)] : 0;
let val = pxData[pxPos + x] - paethPredictor(left, up, upleft);
rawData[rawPos + x] = val;
}
}
function filterSumPaeth(pxData, pxPos, byteWidth, bpp) {
let sum = 0;
for (let x = 0; x < byteWidth; x++) {
let left = x >= bpp ? pxData[pxPos + x - bpp] : 0;
let up = pxPos > 0 ? pxData[pxPos + x - byteWidth] : 0;
let upleft =
pxPos > 0 && x >= bpp ? pxData[pxPos + x - (byteWidth + bpp)] : 0;
let val = pxData[pxPos + x] - paethPredictor(left, up, upleft);
sum += Math.abs(val);
}
return sum;
}
let filters = {
0: filterNone,
1: filterSub,
2: filterUp,
3: filterAvg,
4: filterPaeth,
};
let filterSums = {
0: filterSumNone,
1: filterSumSub,
2: filterSumUp,
3: filterSumAvg,
4: filterSumPaeth,
};
var filterPack = function (pxData, width, height, options, bpp) {
let filterTypes;
if (!("filterType" in options) || options.filterType === -1) {
filterTypes = [0, 1, 2, 3, 4];
} else if (typeof options.filterType === "number") {
filterTypes = [options.filterType];
} else {
throw new Error("unrecognised filter types");
}
if (options.bitDepth === 16) {
bpp *= 2;
}
let byteWidth = width * bpp;
let rawPos = 0;
let pxPos = 0;
let rawData = Buffer.alloc((byteWidth + 1) * height);
let sel = filterTypes[0];
for (let y = 0; y < height; y++) {
if (filterTypes.length > 1) {
// find best filter for this line (with lowest sum of values)
let min = Infinity;
for (let i = 0; i < filterTypes.length; i++) {
let sum = filterSums[filterTypes[i]](pxData, pxPos, byteWidth, bpp);
if (sum < min) {
sel = filterTypes[i];
min = sum;
}
}
}
rawData[rawPos] = sel;
rawPos++;
filters[sel](pxData, pxPos, byteWidth, rawData, rawPos, bpp);
rawPos += byteWidth;
pxPos += byteWidth;
}
return rawData;
};
var packer = createCommonjsModule(function (module) {
let Packer = (module.exports = function (options) {
this._options = options;
options.deflateChunkSize = options.deflateChunkSize || 32 * 1024;
options.deflateLevel =
options.deflateLevel != null ? options.deflateLevel : 9;
options.deflateStrategy =
options.deflateStrategy != null ? options.deflateStrategy : 3;
options.inputHasAlpha =
options.inputHasAlpha != null ? options.inputHasAlpha : true;
options.deflateFactory = options.deflateFactory || zlib__default['default'].createDeflate;
options.bitDepth = options.bitDepth || 8;
// This is outputColorType
options.colorType =
typeof options.colorType === "number"
? options.colorType
: constants.COLORTYPE_COLOR_ALPHA;
options.inputColorType =
typeof options.inputColorType === "number"
? options.inputColorType
: constants.COLORTYPE_COLOR_ALPHA;
if (
[
constants.COLORTYPE_GRAYSCALE,
constants.COLORTYPE_COLOR,
constants.COLORTYPE_COLOR_ALPHA,
constants.COLORTYPE_ALPHA,
].indexOf(options.colorType) === -1
) {
throw new Error(
"option color type:" + options.colorType + " is not supported at present"
);
}
if (
[
constants.COLORTYPE_GRAYSCALE,
constants.COLORTYPE_COLOR,
constants.COLORTYPE_COLOR_ALPHA,
constants.COLORTYPE_ALPHA,
].indexOf(options.inputColorType) === -1
) {
throw new Error(
"option input color type:" +
options.inputColorType +
" is not supported at present"
);
}
if (options.bitDepth !== 8 && options.bitDepth !== 16) {
throw new Error(
"option bit depth:" + options.bitDepth + " is not supported at present"
);
}
});
Packer.prototype.getDeflateOptions = function () {
return {
chunkSize: this._options.deflateChunkSize,
level: this._options.deflateLevel,
strategy: this._options.deflateStrategy,
};
};
Packer.prototype.createDeflate = function () {
return this._options.deflateFactory(this.getDeflateOptions());
};
Packer.prototype.filterData = function (data, width, height) {
// convert to correct format for filtering (e.g. right bpp and bit depth)
let packedData = bitpacker(data, width, height, this._options);
// filter pixel data
let bpp = constants.COLORTYPE_TO_BPP_MAP[this._options.colorType];
let filteredData = filterPack(packedData, width, height, this._options, bpp);
return filteredData;
};
Packer.prototype._packChunk = function (type, data) {
let len = data ? data.length : 0;
let buf = Buffer.alloc(len + 12);
buf.writeUInt32BE(len, 0);
buf.writeUInt32BE(type, 4);
if (data) {
data.copy(buf, 8);
}
buf.writeInt32BE(
crc.crc32(buf.slice(4, buf.length - 4)),
buf.length - 4
);
return buf;
};
Packer.prototype.packGAMA = function (gamma) {
let buf = Buffer.alloc(4);
buf.writeUInt32BE(Math.floor(gamma * constants.GAMMA_DIVISION), 0);
return this._packChunk(constants.TYPE_gAMA, buf);
};
Packer.prototype.packIHDR = function (width, height) {
let buf = Buffer.alloc(13);
buf.writeUInt32BE(width, 0);
buf.writeUInt32BE(height, 4);
buf[8] = this._options.bitDepth; // Bit depth
buf[9] = this._options.colorType; // colorType
buf[10] = 0; // compression
buf[11] = 0; // filter
buf[12] = 0; // interlace
return this._packChunk(constants.TYPE_IHDR, buf);
};
Packer.prototype.packIDAT = function (data) {
return this._packChunk(constants.TYPE_IDAT, data);
};
Packer.prototype.packIEND = function () {
return this._packChunk(constants.TYPE_IEND, null);
};
});
var packerAsync = createCommonjsModule(function (module) {
let PackerAsync = (module.exports = function (opt) {
Stream__default['default'].call(this);
let options = opt || {};
this._packer = new packer(options);
this._deflate = this._packer.createDeflate();
this.readable = true;
});
util__default['default'].inherits(PackerAsync, Stream__default['default']);
PackerAsync.prototype.pack = function (data, width, height, gamma) {
// Signature
this.emit("data", Buffer.from(constants.PNG_SIGNATURE));
this.emit("data", this._packer.packIHDR(width, height));
if (gamma) {
this.emit("data", this._packer.packGAMA(gamma));
}
let filteredData = this._packer.filterData(data, width, height);
// compress it
this._deflate.on("error", this.emit.bind(this, "error"));
this._deflate.on(
"data",
function (compressedData) {
this.emit("data", this._packer.packIDAT(compressedData));
}.bind(this)
);
this._deflate.on(
"end",
function () {
this.emit("data", this._packer.packIEND());
this.emit("end");
}.bind(this)
);
this._deflate.end(filteredData);
};
});
var syncInflate = createCommonjsModule(function (module, exports) {
let assert = require$$0__default['default'].ok;
let kMaxLength = require$$1__default['default'].kMaxLength;
function Inflate(opts) {
if (!(this instanceof Inflate)) {
return new Inflate(opts);
}
if (opts && opts.chunkSize < zlib__default['default'].Z_MIN_CHUNK) {
opts.chunkSize = zlib__default['default'].Z_MIN_CHUNK;
}
zlib__default['default'].Inflate.call(this, opts);
// Node 8 --> 9 compatibility check
this._offset = this._offset === undefined ? this._outOffset : this._offset;
this._buffer = this._buffer || this._outBuffer;
if (opts && opts.maxLength != null) {
this._maxLength = opts.maxLength;
}
}
function createInflate(opts) {
return new Inflate(opts);
}
function _close(engine, callback) {
if (callback) {
process.nextTick(callback);
}
// Caller may invoke .close after a zlib error (which will null _handle).
if (!engine._handle) {
return;
}
engine._handle.close();
engine._handle = null;
}
Inflate.prototype._processChunk = function (chunk, flushFlag, asyncCb) {
if (typeof asyncCb === "function") {
return zlib__default['default'].Inflate._processChunk.call(this, chunk, flushFlag, asyncCb);
}
let self = this;
let availInBefore = chunk && chunk.length;
let availOutBefore = this._chunkSize - this._offset;
let leftToInflate = this._maxLength;
let inOff = 0;
let buffers = [];
let nread = 0;
let error;
this.on("error", function (err) {
error = err;
});
function handleChunk(availInAfter, availOutAfter) {
if (self._hadError) {
return;
}
let have = availOutBefore - availOutAfter;
assert(have >= 0, "have should not go down");
if (have > 0) {
let out = self._buffer.slice(self._offset, self._offset + have);
self._offset += have;
if (out.length > leftToInflate) {
out = out.slice(0, leftToInflate);
}
buffers.push(out);
nread += out.length;
leftToInflate -= out.length;
if (leftToInflate === 0) {
return false;
}
}
if (availOutAfter === 0 || self._offset >= self._chunkSize) {
availOutBefore = self._chunkSize;
self._offset = 0;
self._buffer = Buffer.allocUnsafe(self._chunkSize);
}
if (availOutAfter === 0) {
inOff += availInBefore - availInAfter;
availInBefore = availInAfter;
return true;
}
return false;
}
assert(this._handle, "zlib binding closed");
let res;
do {
res = this._handle.writeSync(
flushFlag,
chunk, // in
inOff, // in_off
availInBefore, // in_len
this._buffer, // out
this._offset, //out_off
availOutBefore
); // out_len
// Node 8 --> 9 compatibility check
res = res || this._writeState;
} while (!this._hadError && handleChunk(res[0], res[1]));
if (this._hadError) {
throw error;
}
if (nread >= kMaxLength) {
_close(this);
throw new RangeError(
"Cannot create final Buffer. It would be larger than 0x" +
kMaxLength.toString(16) +
" bytes"
);
}
let buf = Buffer.concat(buffers, nread);
_close(this);
return buf;
};
util__default['default'].inherits(Inflate, zlib__default['default'].Inflate);
function zlibBufferSync(engine, buffer) {
if (typeof buffer === "string") {
buffer = Buffer.from(buffer);
}
if (!(buffer instanceof Buffer)) {
throw new TypeError("Not a string or buffer");
}
let flushFlag = engine._finishFlushFlag;
if (flushFlag == null) {
flushFlag = zlib__default['default'].Z_FINISH;
}
return engine._processChunk(buffer, flushFlag);
}
function inflateSync(buffer, opts) {
return zlibBufferSync(new Inflate(opts), buffer);
}
module.exports = exports = inflateSync;
exports.Inflate = Inflate;
exports.createInflate = createInflate;
exports.inflateSync = inflateSync;
});
var syncReader = createCommonjsModule(function (module) {
let SyncReader = (module.exports = function (buffer) {
this._buffer = buffer;
this._reads = [];
});
SyncReader.prototype.read = function (length, callback) {
this._reads.push({
length: Math.abs(length), // if length < 0 then at most this length
allowLess: length < 0,
func: callback,
});
};
SyncReader.prototype.process = function () {
// as long as there is any data and read requests
while (this._reads.length > 0 && this._buffer.length) {
let read = this._reads[0];
if (
this._buffer.length &&
(this._buffer.length >= read.length || read.allowLess)
) {
// ok there is any data so that we can satisfy this request
this._reads.shift(); // == read
let buf = this._buffer;
this._buffer = buf.slice(read.length);
read.func.call(this, buf.slice(0, read.length));
} else {
break;
}
}
if (this._reads.length > 0) {
throw new Error("There are some read requests waitng on finished stream");
}
if (this._buffer.length > 0) {
throw new Error("unrecognised content at end of stream");
}
};
});
var process_1 = function (inBuffer, bitmapInfo) {
let outBuffers = [];
let reader = new syncReader(inBuffer);
let filter = new filterParse(bitmapInfo, {
read: reader.read.bind(reader),
write: function (bufferPart) {
outBuffers.push(bufferPart);
},
complete: function () {},
});
filter.start();
reader.process();
return Buffer.concat(outBuffers);
};
var filterParseSync = {
process: process_1
};
let hasSyncZlib$1 = true;
if (!zlib__default['default'].deflateSync) {
hasSyncZlib$1 = false;
}
var parserSync = function (buffer, options) {
if (!hasSyncZlib$1) {
throw new Error(
"To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0"
);
}
let err;
function handleError(_err_) {
err = _err_;
}
let metaData;
function handleMetaData(_metaData_) {
metaData = _metaData_;
}
function handleTransColor(transColor) {
metaData.transColor = transColor;
}
function handlePalette(palette) {
metaData.palette = palette;
}
function handleSimpleTransparency() {
metaData.alpha = true;
}
let gamma;
function handleGamma(_gamma_) {
gamma = _gamma_;
}
let inflateDataList = [];
function handleInflateData(inflatedData) {
inflateDataList.push(inflatedData);
}
let reader = new syncReader(buffer);
let parser$1 = new parser(options, {
read: reader.read.bind(reader),
error: handleError,
metadata: handleMetaData,
gamma: handleGamma,
palette: handlePalette,
transColor: handleTransColor,
inflateData: handleInflateData,
simpleTransparency: handleSimpleTransparency,
});
parser$1.start();
reader.process();
if (err) {
throw err;
}
//join together the inflate datas
let inflateData = Buffer.concat(inflateDataList);
inflateDataList.length = 0;
let inflatedData;
if (metaData.interlace) {
inflatedData = zlib__default['default'].inflateSync(inflateData);
} else {
let rowSize =
((metaData.width * metaData.bpp * metaData.depth + 7) >> 3) + 1;
let imageSize = rowSize * metaData.height;
inflatedData = syncInflate(inflateData, {
chunkSize: imageSize,
maxLength: imageSize,
});
}
inflateData = null;
if (!inflatedData || !inflatedData.length) {
throw new Error("bad png - invalid inflate data response");
}
let unfilteredData = filterParseSync.process(inflatedData, metaData);
inflateData = null;
let bitmapData = bitmapper.dataToBitMap(unfilteredData, metaData);
unfilteredData = null;
let normalisedBitmapData = formatNormaliser(
bitmapData,
metaData,
options.skipRescale
);
metaData.data = normalisedBitmapData;
metaData.gamma = gamma || 0;
return metaData;
};
let hasSyncZlib = true;
if (!zlib__default['default'].deflateSync) {
hasSyncZlib = false;
}
var packerSync = function (metaData, opt) {
if (!hasSyncZlib) {
throw new Error(
"To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0"
);
}
let options = opt || {};
let packer$1 = new packer(options);
let chunks = [];
// Signature
chunks.push(Buffer.from(constants.PNG_SIGNATURE));
// Header
chunks.push(packer$1.packIHDR(metaData.width, metaData.height));
if (metaData.gamma) {
chunks.push(packer$1.packGAMA(metaData.gamma));
}
let filteredData = packer$1.filterData(
metaData.data,
metaData.width,
metaData.height
);
// compress it
let compressedData = zlib__default['default'].deflateSync(
filteredData,
packer$1.getDeflateOptions()
);
filteredData = null;
if (!compressedData || !compressedData.length) {
throw new Error("bad png - invalid compressed data response");
}
chunks.push(packer$1.packIDAT(compressedData));
// End
chunks.push(packer$1.packIEND());
return Buffer.concat(chunks);
};
var read = function (buffer, options) {
return parserSync(buffer, options || {});
};
var write = function (png, options) {
return packerSync(png, options);
};
var pngSync = {
read: read,
write: write
};
var png = createCommonjsModule(function (module, exports) {
let PNG = (exports.PNG = function (options) {
Stream__default['default'].call(this);
options = options || {}; // eslint-disable-line no-param-reassign
// coerce pixel dimensions to integers (also coerces undefined -> 0):
this.width = options.width | 0;
this.height = options.height | 0;
this.data =
this.width > 0 && this.height > 0
? Buffer.alloc(4 * this.width * this.height)
: null;
if (options.fill && this.data) {
this.data.fill(0);
}
this.gamma = 0;
this.readable = this.writable = true;
this._parser = new parserAsync(options);
this._parser.on("error", this.emit.bind(this, "error"));
this._parser.on("close", this._handleClose.bind(this));
this._parser.on("metadata", this._metadata.bind(this));
this._parser.on("gamma", this._gamma.bind(this));
this._parser.on(
"parsed",
function (data) {
this.data = data;
this.emit("parsed", data);
}.bind(this)
);
this._packer = new packerAsync(options);
this._packer.on("data", this.emit.bind(this, "data"));
this._packer.on("end", this.emit.bind(this, "end"));
this._parser.on("close", this._handleClose.bind(this));
this._packer.on("error", this.emit.bind(this, "error"));
});
util__default['default'].inherits(PNG, Stream__default['default']);
PNG.sync = pngSync;
PNG.prototype.pack = function () {
if (!this.data || !this.data.length) {
this.emit("error", "No data provided");
return this;
}
process.nextTick(
function () {
this._packer.pack(this.data, this.width, this.height, this.gamma);
}.bind(this)
);
return this;
};
PNG.prototype.parse = function (data, callback) {
if (callback) {
let onParsed, onError;
onParsed = function (parsedData) {
this.removeListener("error", onError);
this.data = parsedData;
callback(null, this);
}.bind(this);
onError = function (err) {
this.removeListener("parsed", onParsed);
callback(err, null);
}.bind(this);
this.once("parsed", onParsed);
this.once("error", onError);
}
this.end(data);
return this;
};
PNG.prototype.write = function (data) {
this._parser.write(data);
return true;
};
PNG.prototype.end = function (data) {
this._parser.end(data);
};
PNG.prototype._metadata = function (metadata) {
this.width = metadata.width;
this.height = metadata.height;
this.emit("metadata", metadata);
};
PNG.prototype._gamma = function (gamma) {
this.gamma = gamma;
};
PNG.prototype._handleClose = function () {
if (!this._parser.writable && !this._packer.readable) {
this.emit("close");
}
};
PNG.bitblt = function (src, dst, srcX, srcY, width, height, deltaX, deltaY) {
// eslint-disable-line max-params
// coerce pixel dimensions to integers (also coerces undefined -> 0):
/* eslint-disable no-param-reassign */
srcX |= 0;
srcY |= 0;
width |= 0;
height |= 0;
deltaX |= 0;
deltaY |= 0;
/* eslint-enable no-param-reassign */
if (
srcX > src.width ||
srcY > src.height ||
srcX + width > src.width ||
srcY + height > src.height
) {
throw new Error("bitblt reading outside image");
}
if (
deltaX > dst.width ||
deltaY > dst.height ||
deltaX + width > dst.width ||
deltaY + height > dst.height
) {
throw new Error("bitblt writing outside image");
}
for (let y = 0; y < height; y++) {
src.data.copy(
dst.data,
((deltaY + y) * dst.width + deltaX) << 2,
((srcY + y) * src.width + srcX) << 2,
((srcY + y) * src.width + srcX + width) << 2
);
}
};
PNG.prototype.bitblt = function (
dst,
srcX,
srcY,
width,
height,
deltaX,
deltaY
) {
// eslint-disable-line max-params
PNG.bitblt(this, dst, srcX, srcY, width, height, deltaX, deltaY);
return this;
};
PNG.adjustGamma = function (src) {
if (src.gamma) {
for (let y = 0; y < src.height; y++) {
for (let x = 0; x < src.width; x++) {
let idx = (src.width * y + x) << 2;
for (let i = 0; i < 3; i++) {
let sample = src.data[idx + i] / 255;
sample = Math.pow(sample, 1 / 2.2 / src.gamma);
src.data[idx + i] = Math.round(sample * 255);
}
}
}
src.gamma = 0;
}
};
PNG.prototype.adjustGamma = function () {
PNG.adjustGamma(this);
};
});
function getMismatchedPixels(pixelMatchInput) {
const imgA = fs__default['default'].createReadStream(pixelMatchInput.imageAPath).pipe(new png.PNG()).on('parsed', doneReading);
const imgB = fs__default['default'].createReadStream(pixelMatchInput.imageBPath).pipe(new png.PNG()).on('parsed', doneReading);
let filesRead = 0;
function doneReading() {
if (++filesRead < 2)
return;
const mismatchedPixels = pixelmatch_1(imgA.data, imgB.data, null, pixelMatchInput.width, pixelMatchInput.height, {
threshold: pixelMatchInput.pixelmatchThreshold,
includeAA: false,
});
process.send(mismatchedPixels);
}
}
process.on('message', getMismatchedPixels);